Device and method for coal mine high-low negative pressure gas extraction mixing conveying power generation
阅读说明：本技术 一种煤矿高低负压抽采瓦斯混配输送发电的装置及方法 (Device and method for coal mine high-low negative pressure gas extraction mixing conveying power generation ) 是由 马晓钟 康成奎 张国昌 高松 刘永启 刘瑞祥 于 2020-05-22 设计创作，主要内容包括：本发明涉及一种煤矿高低负压抽采瓦斯混配输送发电的装置及方法。其技术方案是：包括瓦斯阻火泄爆系统、瓦斯抑爆系统、瓦斯混配系统、瓦斯管道压力控制系统、瓦斯过滤脱水系统,瓦斯抑爆装置有二种方式,一种是湿法,即在混配瓦斯输送管道内喷细水雾,细水雾与瓦斯全程连续混合输送；二是干法,即在混配瓦斯管道内监测到火焰时喷二氧化碳。其有益效果如下：本发明采用高速气流引射原理将高低负压抽采瓦斯混配,结合在线水位控制湿式放散的方式,解决了高低负压瓦斯混配发电时瓦斯抽采泵出现的“憋泵”现象,并能均匀混合；通过这种方法,将低负压抽采的较低浓度瓦斯安全可靠地用于内燃发电机组发电,提高瓦斯利用率,促进煤炭行业节能减排。(The invention relates to a device and a method for coal mine high-low negative pressure gas extraction mixing conveying power generation. The technical scheme is as follows: the system comprises a gas fire-retardant explosion-venting system, a gas explosion-suppression system, a gas mixing system, a gas pipeline pressure control system and a gas filtering and dehydrating system, wherein the gas explosion-suppression device has two modes, namely a wet method, namely spraying fine water mist in a mixed gas conveying pipeline, and continuously mixing and conveying the fine water mist and gas in the whole process; the second is a dry method, that is, carbon dioxide is sprayed when flame is monitored in a mixed gas pipeline. The beneficial effects are as follows: according to the invention, high-low negative pressure gas extraction is mixed by adopting a high-speed airflow injection principle, and a mode of online water level control wet-type diffusion is combined, so that the pump holding phenomenon of a gas extraction pump during high-low negative pressure gas mixing power generation is solved, and the gas extraction pump can be uniformly mixed; by the method, the low-negative-pressure extracted gas with lower concentration is safely and reliably used for power generation of the internal combustion generator set, the gas utilization rate is improved, and energy conservation and emission reduction of the coal industry are promoted.)
1. The utility model provides a coal mine height negative pressure is taken out gas and is thoughtlessly joined in marriage device of carrying electricity generation which carries, characterized by: comprises a low negative pressure gas fire-retardant explosion-relief device (4), a low negative pressure gas dry-type flame arrester (5), a conversion valve A (6), a conversion valve B (7), an injection mixer (8), a gas explosion-suppression device (10), a mixed gas fire-retardant explosion-relief device (11), a mixed gas dry-type flame arrester (12), a gas flow-dividing regulating valve (13), an online gas radiator (14), a filter dehydrator (15), a backflow water seal (18), an internal combustion engine supercharger (19), an intercooler (20), an internal combustion engine air inlet main pipe (21), a float-type drain valve (22), an internal combustion generator set (23), a conversion valve C (24), a conversion valve D (25), a conversion valve E (26), a high negative pressure gas dry-type flame arrester (27), a high negative pressure gas fire-retardant explosion-relief device (28), and a high negative pressure dry-type gas extraction pump (27) through the high negative pressure gas fire-retardant explosion-relief device (28), the high negative pressure gas dry, The C conversion valve (24) is communicated with the injection mixer (8), the low-negative-pressure gas extraction pump is communicated with the injection mixer (8) through the low-negative-pressure gas fire-retardant explosion-venting device (4), the low-negative-pressure gas dry-type flame arrester (5) and the A conversion valve (6), the rear end of the injection mixer (8) is sequentially connected with a plurality of groups of gas explosion suppression devices (10), and the gas explosion-suppression devices are connected to a filter dehydrator (15), a backflow water seal (18), an internal combustion engine supercharger (19), an intercooler (20), an internal combustion engine air inlet main pipe (21), a float-type drain valve (22) and an internal combustion generator set (23) through a mixed gas fire-retardant explosion-venting device (11), a mixed gas dry-type flame arrester (12), a gas shunt regulating valve (13);
under the action of a high-negative-pressure gas extraction pump, extracted gas with higher concentration enters an injection mixer (8) through a high-negative-pressure gas delivery valve (30), a high-negative-pressure gas fire-retardant explosion-relief device (28), a high-negative-pressure gas dry-type fire-retardant device (27), an E conversion valve (26) and a C conversion valve (24), high-speed gas airflow is formed in the injection mixer (8), low-negative-pressure gas extracted gas with lower concentration is obtained through a low-negative-pressure gas delivery valve (2), a pressure gas fire-retardant explosion-relief device (4), a low-negative-pressure gas dry-type fire-retardant device (5) and an A conversion valve (6) in a negative-pressure injection mode, the phenomenon that the gas extraction pump is blocked due to mutual interference when two paths of gas meet is avoided, and uniform mixing of the high-negative-pressure gas extracted gas in the injection mixer (8) is realized;
the mixed gas enters an online gas radiator (14) through a gas explosion suppression device (10), a mixed gas fire-retardant explosion venting device (11) and a mixed gas dry-type flame arrester (12), a gas shunt regulating valve (13) with the function of bypassing and diffusing the gas is arranged in front of the online gas radiator (14), the opening degree of the gas shunt regulating valve is regulated according to the power generation requirement of an internal combustion generator set (23), and a mixed gas pressure sensor (16) in front of an internal combustion engine pressure regulating valve (17) is kept to be not lower than 3kPa, namely the pressure in a gas conveying pipeline is kept to be basically stable.
2. The coal mine high-low negative pressure gas extraction, mixing and conveying power generation device according to claim 1, which is characterized in that: after high-low negative pressure extracted gas containing more water passes through a high negative pressure gas dry-type flame arrester (27) and a low negative pressure gas dry-type flame arrester (5), most of water is removed and flows back to the high negative pressure gas fire-retarding explosion-venting device (28) and the low negative pressure gas fire-retarding explosion-venting device (4); most of moisture in mixed gas from a gas explosion suppression device (10) is accumulated after passing through a mixed gas fire-retardant explosion-venting device (11), the mixed gas passes through a mixed gas dry-type flame arrester (12), the moisture in the mixed gas is further removed and flows back to the mixed gas fire-retardant explosion-venting device (11), and liquid water overflows from the mixed gas fire-retardant explosion-venting device and enters a backflow water seal (18); the mixed gas is further dehydrated by a filter dehydrator (15) and reflows to a reflux water seal (18). The collected liquid water is discharged from the return water seal (18). The mixed gas is decompressed and stabilized by a pressure regulating valve (17) of the internal combustion engine, sucked and pressurized by a supercharger (19) of the internal combustion engine, cooled by an intercooler (20), and enters an air inlet main pipe (21) of the internal combustion engine, and the separated liquid water enters a float type drain valve (22) and is discharged.
3. The coal mine high-low negative pressure gas extraction, mixing and conveying power generation device according to claim 1, which is characterized in that: the gas explosion suppression device (10) has two modes, one mode is a wet method, namely, fine water mist is sprayed in a mixed gas conveying pipeline, and the fine water mist and gas are continuously mixed and conveyed in the whole process; secondly, dry method, namely spraying carbon dioxide when flame is monitored in the mixed gas pipeline; one of the two modes can be selected to form the gas explosion suppression system.
4. The coal mine high-low negative pressure gas extraction, mixing and conveying power generation device according to claim 1, which is characterized in that: the low negative pressure gas fire-retardant explosion venting device (4) and the high negative pressure gas fire-retardant explosion venting device (28) have the same structure and respectively consist of a liquid level meter (4.1), a lower porous plate (4.2), a stainless steel wool fire-retardant core (4.3), an upper porous plate (4.4), an air inlet bent pipe (4.5), a metal structure body (4.6), an explosion venting sheet (4.7), an air outlet bent pipe (4.8), an automatic water supplementing switch (4.9), a water supplementing valve (4.10), a water drain valve (4.11) and water, wherein the inner opening of the metal structure body (4.6) is provided with an air inlet bent pipe (4.5) and an air outlet bent pipe (4.8), the lower side is provided with the stainless steel wool fire-retardant core (4.3) and the upper porous plate (4.4), the top is provided with the explosion venting sheet (4.7), the inner opening of the air inlet bent pipe (4.5) penetrates through the stainless steel wool fire-retardant core (4.3) and the upper porous plate (4.4) and extends into the water in the inner cavity of the metal structure body (4.6), and the upper, the top is provided with an explosion venting sheet (4.7); the extracted gas enters water from the air inlet elbow (4.5), then enters the inner cavity of the metal structure body (4.6) through the stainless steel wool fire-retardant core (4.3), enters the air outlet elbow from the upper end of the air outlet elbow (4.8) and then flows out of the dry-wet fire-retardant explosion venting device.
5. The coal mine high-low negative pressure gas extraction, mixing and conveying power generation device according to claim 1, which is characterized in that: the injection mixer (8) is composed of a nozzle (8.1), a negative pressure chamber (8.2), a gas mixing section (8.3) and a gas diffusion section (8.4), wherein gas extraction is used as power of the gas extraction pump, one path of gas enters the nozzle (8.1) to generate high-speed airflow, negative pressure is formed in the negative pressure chamber (8.2), the other path of gas extraction is sucked through a suction nozzle (8.5), two paths of extracted gas are uniformly mixed in the gas mixing section (8.3) and enter the gas diffusion section (8.4), the pressure of the mixed extracted gas is recovered to a certain degree, and therefore mutual interference of the two paths of gas is overcome, and the pump holding phenomenon of the gas extraction pump is caused.
6. The coal mine high-low negative pressure gas extraction, mixing and conveying power generation device according to claim 1, which is characterized in that: the gas explosion suppression device (10) comprises an atomizing nozzle (10.1), an A connecting flange seat (10.2), a B connecting flange seat (10.3), a filter (10.4), a valve (10.5), a high-pressure connecting water pipe (10.6), a high-pressure water conveying main pipe (10.7) and a mixed gas conveying pipeline (10.8), wherein high-pressure water in the high-pressure water conveying main pipe (10.7) sequentially passes through the high-pressure connecting water pipe (10.6), the valve (10.5), the filter (10.4), the B connecting flange seat (10.3) and the A connecting flange seat (10.2) to enter the atomizing nozzle (10.1) to form fog, and then is mixed with gas in the mixed gas conveying pipeline (10.8) in a downstream mode.
7. The coal mine high-low negative pressure gas extraction, mixing and conveying power generation device according to claim 1, which is characterized in that: the online gas diffuser (14) is composed of a temperature monitor (14.1), a gas pressure limiting pipe (14.2), a liquid level meter (14.3), a diffuser body (14.4), a gas bypass connecting pipe (14.5), a dry flame arrester (14.6), a water replenishing valve (14.7), water (14.8), a heater (14.9) and a water drain valve (14.10), wherein the middle part of the diffuser body (14.4) penetrates through the gas pressure limiting pipe (14.2), the gas pressure limiting pipe (14.2) is a three-way pipe, the lower side of the gas pressure limiting pipe extends into the water (14.8), and the top of the diffuser body (14.4) is provided with the gas bypass connecting pipe (14.5) and the dry flame arrester (14.6); gas enters and exits from the gas pressure limiting pipe (14.2), gas positive pressure is formed in the gas main pipe, partial water (14.8) in the gas pressure limiting pipe is pressed downwards into the peripheral diffuser body (14.4) to enable the water surface to rise, and the height difference between the inner water surface and the outer water surface is the gas pressure in the gas main pipe; when the gas pressure exceeds a set limit value, namely the gas in the gas pressure limiting pipe (14.2) moves out of the lowest end under the water surface, once mixed gas flows out of the gas pressure limiting pipe, enters the diffuser body (14.4) through a water seal, and is discharged out of the atmosphere through the dry type flame arrester (14.6), if gas is extracted, the gas enters the gas bypass connecting pipe (14.5) and is discharged out of the atmosphere through the dry type flame arrester (14.6), so that the pressure of a gas conveying pipeline system is maintained in a set range.
8. The coal mine high-low negative pressure gas extraction, mixing and conveying power generation device according to claim 7, which is characterized in that: a water replenishing valve (14.7), a water discharging valve (14.10), a temperature monitor (14.1) and a heater (14.9) are also arranged on the diffuser body (14.4), and the water replenishing valve (14.7) and the water discharging valve (14.10) are used for adjusting and ensuring the water level and setting the pressure of a gas conveying pipeline system; the temperature monitor (14.1) and the heater (14.9) are used for preventing the interior of the dry-wet composite radiator from being frozen when the dry-wet composite radiator is used in cold regions in winter.
9. The coal mine high-low negative pressure gas extraction, mixing and conveying power generation device according to claim 1, which is characterized in that: backflow water seal (18) by water inlet return bend (18.1), gas residual gas bleeder valve (18.2), water seal body (18.3), outlet pipe (18.4), water seal water (18.5), drain valve (18.6) constitute, one side of water seal body (18.3) be equipped with outlet pipe (18.4), the opposite side is equipped with water inlet return bend (18.1), the inner chamber is equipped with water seal water (18.5), the bottom is equipped with drain valve (18.6), the top is equipped with gas residual gas bleeder valve (18.2), the inner of water inlet return bend (18.1) is stretched into downwards in the water seal water (18.5).
10. The coal mine high-low negative pressure gas extraction mixed conveying power generation method as claimed in any one of claims 1 to 9, which is characterized in that: the method comprises the following steps:
firstly, preparation work: injecting water into the low negative pressure gas fire-retardant explosion-venting device (4), the high negative pressure gas fire-retardant explosion-venting device (28) and the online gas radiator (14) to reach a set liquid level height; starting the gas explosion suppression device (10);
secondly, pumping and conveying gas: firstly, a gas diversion regulating valve (13), a C conversion valve (24), a D conversion valve (25) and an A conversion valve (6) are set in a fully open state, and a B conversion valve (7) and the D conversion valve (25) are set in a fully closed state; then the high negative pressure gas delivery valve (30) is fully opened, and the high negative pressure gas relief valve (31) is gradually closed; and finally, the low negative pressure gas delivery valve (2) is opened and the low negative pressure gas relief valve (1) is closed in sequence. When the monitoring value of the mixed gas concentration sensor (9) is smaller than the minimum requirement of the internal combustion generator set (23), the low-negative-pressure gas relief valve (1) is partially opened properly until the mixed gas concentration reaches the standard; if the low negative pressure gas is relatively high in concentration and the high negative pressure gas is higher in concentration and has other purposes, the high negative pressure gas and the low negative pressure gas are changed to enter the inlet of the injection mixer (8) by adjusting the switching states of the A switching valve (6), the B switching valve (7), the C switching valve (24), the D switching valve (25) and the E switching valve (26), and the low negative pressure gas is used for injecting the high negative pressure gas;
thirdly, mixed gas power generation: starting an internal combustion generator set (23), gradually reducing the opening degree of the gas flow dividing regulating valve (13), and gradually increasing the power generation power; after adjustment, the power of the internal combustion generator set (23) is increased to rated power or required proper power, the monitoring value of the mixed gas pressure sensor (16) is always kept to be not lower than 3kPa, and the mixed gas pressure sensor is kept stable within a certain range;
fourthly, dehydrating and purifying gas: most of water brought away by the low-negative-pressure gas extracted through the low-negative-pressure gas fire-retardant explosion-release device (4) passes through the low-negative-pressure gas dry-type flame arrester (5) and then is removed and flows back to the low-negative-pressure gas fire-retardant explosion-release device (4); the water taken away by the high negative pressure gas extraction through the high negative pressure gas fire-retardant explosion-release device (28) flows through the high negative pressure gas dry-type flame arrester (27) and then most of the water flows back to the high negative pressure gas fire-retardant explosion-release device (28); the mixed gas passes through a fine water mist explosion suppression device, condensed water is gathered in a mixed gas fire-retardant explosion venting device (11), the mixed gas is subjected to partial water removal through a mixed gas dry-type flame arrester (12) and flows back to the mixed gas fire-retardant explosion venting device (11), and the mixed gas overflows into a backflow water seal (18) after the liquid level of the mixed gas fire-retardant explosion venting device (11) reaches a certain height and then flows back to an atomization pool for recycling. The mixed gas continuously flows through a filter dehydrator (15), particles in the mixed gas are filtered, part of water is removed, and the mixed gas and the water are refluxed to a reflux water seal (18); mixed gas is sucked and pressurized by an internal combustion engine supercharger (19), is cooled by an intercooler (20), and is separated out liquid water in an internal combustion engine intake manifold (21), and the water is discharged through a float type drain valve (22);
fifthly, controlling gas conveying pressure: the monitoring pressure of the set low negative pressure gas pressure sensor (3) and the high negative pressure gas pressure sensor (29) is not higher than 15kPa, the monitoring pressure of the mixed gas pressure sensor (16) is not lower than 3kPa, the water seal diffusion pressure set in the online gas diffuser (14) is not higher than 6kPa, and the water seal diffusion pressure set in the backflow water seal (18) is not lower than 15 kPa; when the device is in normal operation, the resistance of various fire-retardant filtering devices is gradually increased, when a low-negative-pressure gas pressure sensor (3) and a high-negative-pressure gas pressure sensor (29) are close to a set upper limit value, and a mixed gas pressure sensor (16) is still lower than 3kPa, the core of each fire-retardant filtering device is required to be cleaned, an internal combustion generator set (23) is suddenly shut down, mixed gas is automatically diffused and emptied through a water seal in an online gas diffuser (14), and a pumping gas pump is prevented from being blocked;
sixthly, fire resistance and explosion relief of the conveying pipeline: if the gas transmission pipeline is detonated due to the backfire of the internal combustion generator set (23), the flame is prevented from returning by the mixed gas dry-type flame arrester (12), and the mixed gas is guided in the mixed gas fire-arresting explosion-venting device (11) for explosion venting; if the mixed gas dry-type flame arrester (12) does not completely extinguish flame, fire is continuously arrested in the mixed gas fire-arresting explosion-venting device (11); if the fire is not completely retarded at the moment, the explosion suppression device (10) continues to suppress the flame, and the low negative pressure gas dry-type flame arrester (5), the low negative pressure gas fire-retarding explosion-venting device (4), the high negative pressure gas dry-type flame arrester (27) and the high negative pressure gas fire-retarding explosion-venting device (28) continue to retard the fire and release the explosion, so that the safety of the high and low negative pressure gas extraction pump is protected; if flame occurs in the explosion suppression device section of the conveying pipeline, the gas explosion suppression device (10), the low negative pressure gas dry-type flame arrester (5), the low negative pressure gas fire-retarding explosion-releasing device (4), the high negative pressure gas dry-type flame arrester (27) and the high negative pressure gas fire-retarding explosion-releasing device (28) protect the safety of the high and low negative pressure gas extraction pump.
Technical Field
The invention relates to a coal mine extracted gas utilization technology, in particular to a coal mine high-low negative pressure extracted gas mixing, conveying and power generating device and method.
Background
At present, the utilization of coal mine gas in China is still in the starting stage, and the utilization rate is generally low. In the last decade, the purity of underground gas extraction in China is 100-130 hundred million meters3The utilization rate is about 35 percent. According to incomplete statistics, high-concentration extracted gas with the methane concentration of more than 30 percent approximately accounts for 44 percent of the total amount of underground extracted gas, is mainly used for power generation of an internal combustion engine and civil fuel, is used for preparing LNG, CNG and the like in a small amount, and has the utilization rate of about 60 percent; the low-concentration extracted gas with the methane concentration of 10% -30% accounts for about 29%, is mainly used for power generation of a low-concentration gas internal combustion engine, and has the utilization rate of about 27%; methane concentration of 10% or less accounts for about 27%, and is less useful. Therefore, the low-concentration extracted gas with the methane concentration lower than 30 percent, particularly lower than 10 percent, has large proportion in the total amount of extracted gas, the utilization rate is low, the overall utilization rate is low, and the purity of the exhausted gas is about 75 hundred million m per year3Equivalent to 922 ten thousand tons of standard coal being wasted and 1.1 hundred million tons of CO being discharged to the air2。
Through investigation and analysis, the economic development of China has been advanced in the new century, the demand for coal is greatly increased, and the mining intensity of high gas mining areas and coal and gas outburst mining areas is increased. In order to ensure the safety in the coal mining process, the newly built or expanded coal mine gas extraction generally adopts a high negative pressure and low negative pressure simultaneous extraction mode. The high negative pressure extraction is to pre-extract gas from the coal seam, and the gas concentration is generally higher; the low negative pressure extraction is to extract the upper corner, the adjacent layer and the goaf of the coal mining area, and the gas concentration is generally lower and is usually less than 10 percent or lower. For more than ten years, gas internal combustion engine power stations built in China can only utilize high negative pressure extracted gas, namely extracted gas with the concentration of more than 10%. In the same gas ground pumping station, the gas extracted at low negative pressure and with the concentration lower than 10 percent or lower is basically discharged in the air. Some gas power stations try to combine high-low negative pressure extracted gas for power generation, but the phenomenon of pump holding of an extraction pump caused by mutual interference of similar gas occurs. In addition, for high negative pressure gas extraction power generation alone, the pumping phenomenon of the extraction pump can be caused because the fluctuation of the total gas supply amount cannot be completely matched with the power generation capacity. And in actual operation, the original discharge port of the gas extraction pump is partially opened, a part of gas is kept in a normal discharge state, and a part of gas is conveyed to generate electricity. When the generating equipment ability is great, the booster of gas internal-combustion engine is in the suction gas state, and the inside negative pressure that forms of pipeline, the moisture that the gas contained passes through the booster and gets into the internal-combustion engine cylinder, produces three kinds of harm: firstly, liquid water impacts a supercharger blade running at a high speed, and secondly, the liquid water enters the cylinder to be vaporized and absorb heat, so that the power generation efficiency is reduced; thirdly, the negative pressure at the inlet of the pressure regulating valve of the internal combustion engine loses the functions of pressure reduction and pressure stabilization, and the phenomenon of explosion vibration of the internal combustion engine is easy to occur when the gas concentration and the pressure fluctuate greatly.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a device and a method for coal mine high and low negative pressure gas extraction mixing and conveying power generation.
The invention provides a coal mine high-low negative pressure gas extraction mixing and conveying power generation device, which adopts the technical scheme that: comprises a low negative pressure gas fire-retardant explosion-relief device (4), a low negative pressure gas dry-type flame arrester (5), a conversion valve A (6), a conversion valve B (7), an injection mixer (8), a gas explosion-suppression device (10), a mixed gas fire-retardant explosion-relief device (11), a mixed gas dry-type flame arrester (12), a gas flow-dividing regulating valve (13), an online gas radiator (14), a filter dehydrator (15), a backflow water seal (18), an internal combustion engine supercharger (19), an intercooler (20), an internal combustion engine air inlet main pipe (21), a float-type drain valve (22), an internal combustion generator set (23), a conversion valve C (24), a conversion valve D (25), a conversion valve E (26), a high negative pressure gas dry-type flame arrester (27), a high negative pressure gas fire-retardant explosion-relief device (28), and a high negative pressure dry-type gas extraction pump (27) through the high negative pressure gas fire-retardant explosion-relief device (28), the high negative pressure gas dry, The C conversion valve (24) is communicated with the injection mixer (8), the low-negative-pressure gas extraction pump is communicated with the injection mixer (8) through the low-negative-pressure gas fire-retardant explosion-venting device (4), the low-negative-pressure gas dry-type flame arrester (5) and the A conversion valve (6), the rear end of the injection mixer (8) is sequentially connected with a plurality of groups of gas explosion suppression devices (10), and the gas explosion-suppression devices are connected to a filter dehydrator (15), a backflow water seal (18), an internal combustion engine supercharger (19), an intercooler (20), an internal combustion engine air inlet main pipe (21), a float-type drain valve (22) and an internal combustion generator set (23) through a mixed gas fire-retardant explosion-venting device (11), a mixed gas dry-type flame arrester (12), a gas shunt regulating valve (13);
under the action of a high-negative-pressure gas extraction pump, extracted gas with higher concentration enters an injection mixer (8) through a high-negative-pressure gas delivery valve (30), a high-negative-pressure gas fire-retardant explosion-relief device (28), a high-negative-pressure gas dry-type fire-retardant device (27), an E conversion valve (26) and a C conversion valve (24), high-speed gas airflow is formed in the injection mixer (8), low-negative-pressure gas extracted gas with lower concentration is obtained through a low-negative-pressure gas delivery valve (2), a pressure gas fire-retardant explosion-relief device (4), a low-negative-pressure gas dry-type fire-retardant device (5) and an A conversion valve (6) in a negative-pressure injection mode, the phenomenon that the gas extraction pump is blocked due to mutual interference when two paths of gas meet is avoided, and uniform mixing of the high-negative-pressure gas extracted gas in the injection mixer (8) is realized;
the mixed gas enters an online gas radiator (14) through a gas explosion suppression device (10), a mixed gas fire-retardant explosion venting device (11) and a mixed gas dry-type flame arrester (12), a gas shunt regulating valve (13) with the function of bypassing and diffusing the gas is arranged in front of the online gas radiator (14), the opening degree of the gas shunt regulating valve is regulated according to the power generation requirement of an internal combustion generator set (23), and a mixed gas pressure sensor (16) in front of an internal combustion engine pressure regulating valve (17) is kept to be not lower than 3kPa, namely the pressure in a gas conveying pipeline is kept to be basically stable.
Preferably, after high-low negative pressure extracted gas containing more water passes through the high-negative pressure gas dry-type flame arrester (27) and the low-negative pressure gas dry-type flame arrester (5), most of water is removed and flows back to the high-negative pressure gas fire-retarding explosion-venting device (28) and the low-negative pressure gas fire-retarding explosion-venting device (4); most of moisture in mixed gas from a gas explosion suppression device (10) is accumulated after passing through a mixed gas fire-retardant explosion-venting device (11), the mixed gas passes through a mixed gas dry-type flame arrester (12), the moisture in the mixed gas is further removed and flows back to the mixed gas fire-retardant explosion-venting device (11), and liquid water overflows from the mixed gas fire-retardant explosion-venting device and enters a backflow water seal (18); the mixed gas is further dehydrated by a filter dehydrator (15) and reflows to a reflux water seal (18). The collected liquid water is discharged from the return water seal (18). The mixed gas is decompressed and stabilized by a pressure regulating valve (17) of the internal combustion engine, sucked and pressurized by a supercharger (19) of the internal combustion engine, cooled by an intercooler (20), and enters an air inlet main pipe (21) of the internal combustion engine, and the separated liquid water enters a float type drain valve (22) and is discharged.
Preferably, the gas explosion suppression device (10) has two modes, one mode is a wet method, namely, fine water mist is sprayed in the mixed gas conveying pipeline, and the fine water mist and gas are continuously mixed and conveyed in the whole process; secondly, dry method, namely spraying carbon dioxide when flame is monitored in the mixed gas pipeline; one of the two modes can be selected to form the gas explosion suppression system.
Preferably, the low negative pressure gas fire and explosion relief device (4) and the high negative pressure gas fire and explosion relief device (28) have the same structure and respectively comprise a liquid level meter (4.1), a lower porous plate (4.2), a stainless steel wool fire relief core (4.3), an upper porous plate (4.4), an air inlet bent pipe (4.5), a metal structure body (4.6), an explosion relief sheet (4.7), an air outlet bent pipe (4.8), an automatic water replenishing switch (4.9), a water replenishing valve (4.10), a water drain valve (4.11) and water, the inner cavity of the metal structure body (4.6) is provided with an air inlet bent pipe (4.5) and an air outlet bent pipe (4.8), the lower side is provided with the stainless steel wool fire relief core (4.3) and the upper porous plate (4.4), the top is provided with the explosion relief sheet (4.7), the inner opening of the air inlet bent pipe (4.5) penetrates through the stainless steel wool fire relief core (4.3) and the upper porous plate (4.4) to extend into the water in the inner cavity of the metal structure body (4.6), and the upper side of the metal structure body (, the top is provided with an explosion venting sheet (4.7); the extracted gas enters water from the air inlet elbow (4.5), then enters the inner cavity of the metal structure body (4.6) through the stainless steel wool fire-retardant core (4.3), enters the air outlet elbow from the upper end of the air outlet elbow (4.8) and then flows out of the dry-wet fire-retardant explosion venting device.
Preferably, the injection mixer (8) is composed of a nozzle (8.1), a negative pressure chamber (8.2), a gas mixing section (8.3) and a gas diffusion section (8.4), wherein an extraction gas pump is used as power, one path of gas enters the nozzle (8.1) to generate high-speed airflow, negative pressure is formed in the negative pressure chamber (8.2), the other path of extracted gas is sucked through a suction nozzle (8.5), the two paths of extracted gas are uniformly mixed in the gas mixing section (8.3) and enter the gas diffusion section (8.4), and the pressure of the mixed extracted gas is recovered to a certain degree, so that the phenomenon that the two paths of gas interfere with each other to cause the pump holding phenomenon of the gas extraction pump is overcome.
Preferably, the gas explosion suppression device (10) comprises an atomizing nozzle (10.1), an A connection flange seat (10.2), a B connection flange seat (10.3), a filter (10.4), a valve (10.5), a high-pressure connection water pipe (10.6), a high-pressure water delivery main pipe (10.7) and a mixed gas delivery pipeline (10.8), wherein high-pressure water in the high-pressure water delivery main pipe (10.7) sequentially passes through the high-pressure connection water pipe (10.6), the valve (10.5), the filter (10.4), the B connection flange seat (10.3) and the A connection flange seat (10.2) to enter the atomizing nozzle (10.1) to form fog, and then flows along with gas in the mixed gas delivery pipeline (10.8) for mixing and mixing.
Preferably, the online gas diffuser (14) consists of a temperature monitor (14.1), a gas pressure limiting pipe (14.2), a liquid level meter (14.3), a diffuser body (14.4), a gas bypass connecting pipe (14.5), a dry flame arrester (14.6), a water replenishing valve (14.7), water (14.8), a heater (14.9) and a water drain valve (14.10), wherein the middle part of the diffuser body (14.4) penetrates through the gas pressure limiting pipe (14.2), the gas pressure limiting pipe (14.2) is a three-way pipe, the lower side of the gas pressure limiting pipe extends into the water (14.8), and the top of the diffuser body (14.4) is provided with the gas bypass connecting pipe (14.5) and the dry flame arrester (14.6); gas enters and exits from the gas pressure limiting pipe (14.2), gas positive pressure is formed in the gas main pipe, partial water (14.8) in the gas pressure limiting pipe is pressed downwards into the peripheral diffuser body (14.4) to enable the water surface to rise, and the height difference between the inner water surface and the outer water surface is the gas pressure in the gas main pipe; when the gas pressure exceeds a set limit value, namely the gas in the gas pressure limiting pipe (14.2) moves out of the lowest end under the water surface, once mixed gas flows out of the gas pressure limiting pipe, enters the diffuser body (14.4) through a water seal, and is discharged out of the atmosphere through the dry type flame arrester (14.6), if gas is extracted, the gas enters the gas bypass connecting pipe (14.5) and is discharged out of the atmosphere through the dry type flame arrester (14.6), so that the pressure of a gas conveying pipeline system is maintained in a set range.
Preferably, a water replenishing valve (14.7), a water drain valve (14.10), a temperature monitor (14.1) and a heater (14.9) are further arranged on the diffuser body (14.4), and the water replenishing valve (14.7) and the water drain valve (14.10) are used for adjusting and ensuring the water level and setting the pressure of a gas conveying pipeline system; the temperature monitor (14.1) and the heater (14.9) are used for preventing the interior of the dry-wet composite radiator from being frozen when the dry-wet composite radiator is used in cold regions in winter.
Preferably, foretell backward flow water seal (18) comprises inlet bend (18.1), gas residual gas bleeder valve (18.2), water seal body (18.3), outlet pipe (18.4), water seal water (18.5), drain valve (18.6), one side of water seal body (18.3) be equipped with outlet pipe (18.4), the opposite side is equipped with inlet bend (18.1), the inner chamber is equipped with water seal water (18.5), the bottom is equipped with drain valve (18.6), the top is equipped with gas residual gas bleeder valve (18.2), the inner of inlet bend (18.1) is stretched into downwards in the water seal water (18.5).
The invention provides a coal mine high-low negative pressure gas extraction mixed conveying power generation method, which comprises the following steps:
firstly, preparation work: injecting water into the low negative pressure gas fire-retardant explosion-venting device (4), the high negative pressure gas fire-retardant explosion-venting device (28) and the online gas radiator (14) to reach a set liquid level height; starting the gas explosion suppression device (10);
secondly, pumping and conveying gas: firstly, a gas diversion regulating valve (13), a C conversion valve (24), a D conversion valve (25) and an A conversion valve (6) are set in a fully open state, and a B conversion valve (7) and the D conversion valve (25) are set in a fully closed state; then the high negative pressure gas delivery valve (30) is fully opened, and the high negative pressure gas relief valve (31) is gradually closed; and finally, the low negative pressure gas delivery valve (2) is opened and the low negative pressure gas relief valve (1) is closed in sequence. When the monitoring value of the mixed gas concentration sensor (9) is smaller than the minimum requirement of the internal combustion generator set (23), the low-negative-pressure gas relief valve (1) is partially opened properly until the mixed gas concentration reaches the standard; if the low negative pressure gas is relatively high in concentration and the high negative pressure gas is higher in concentration and has other purposes, the high negative pressure gas and the low negative pressure gas are changed to enter the inlet of the injection mixer (8) by adjusting the switching states of the A switching valve (6), the B switching valve (7), the C switching valve (24), the D switching valve (25) and the E switching valve (26), and the low negative pressure gas is used for injecting the high negative pressure gas;
thirdly, mixed gas power generation: starting an internal combustion generator set (23), gradually reducing the opening degree of the gas flow dividing regulating valve (13), and gradually increasing the power generation power; after adjustment, the power of the internal combustion generator set (23) is increased to rated power or required proper power, the monitoring value of the mixed gas pressure sensor (16) is always kept to be not lower than 3kPa, and the mixed gas pressure sensor is kept stable within a certain range;
fourthly, dehydrating and purifying gas: most of water brought away by the low-negative-pressure gas extracted through the low-negative-pressure gas fire-retardant explosion-release device (4) passes through the low-negative-pressure gas dry-type flame arrester (5) and then is removed and flows back to the low-negative-pressure gas fire-retardant explosion-release device (4); the water taken away by the high negative pressure gas extraction through the high negative pressure gas fire-retardant explosion-release device (28) flows through the high negative pressure gas dry-type flame arrester (27) and then most of the water flows back to the high negative pressure gas fire-retardant explosion-release device (28); the mixed gas passes through a fine water mist explosion suppression device, condensed water is gathered in a mixed gas fire-retardant explosion venting device (11), the mixed gas is subjected to partial water removal through a mixed gas dry-type flame arrester (12) and flows back to the mixed gas fire-retardant explosion venting device (11), and the mixed gas overflows into a backflow water seal (18) after the liquid level of the mixed gas fire-retardant explosion venting device (11) reaches a certain height and then flows back to an atomization pool for recycling. The mixed gas continuously flows through a filter dehydrator (15), particles in the mixed gas are filtered, part of water is removed, and the mixed gas and the water are refluxed to a reflux water seal (18); mixed gas is sucked and pressurized by an internal combustion engine supercharger (19), is cooled by an intercooler (20), and is separated out liquid water in an internal combustion engine intake manifold (21), and the water is discharged through a float type drain valve (22);
fifthly, controlling gas conveying pressure: the monitoring pressure of the set low negative pressure gas pressure sensor (3) and the high negative pressure gas pressure sensor (29) is not higher than 15kPa, the monitoring pressure of the mixed gas pressure sensor (16) is not lower than 3kPa, the water seal diffusion pressure set in the online gas diffuser (14) is not higher than 6kPa, and the water seal diffusion pressure set in the backflow water seal (18) is not lower than 15 kPa; when the device is in normal operation, the resistance of various fire-retardant filtering devices is gradually increased, when a low-negative-pressure gas pressure sensor (3) and a high-negative-pressure gas pressure sensor (29) are close to a set upper limit value, and a mixed gas pressure sensor (16) is still lower than 3kPa, the core of each fire-retardant filtering device is required to be cleaned, an internal combustion generator set (23) is suddenly shut down, mixed gas is automatically diffused and emptied through a water seal in an online gas diffuser (14), and a pumping gas pump is prevented from being blocked;
sixthly, fire resistance and explosion relief of the conveying pipeline: if the gas transmission pipeline is detonated due to the backfire of the internal combustion generator set (23), the flame is prevented from returning by the mixed gas dry-type flame arrester (12), and the mixed gas is guided in the mixed gas fire-arresting explosion-venting device (11) for explosion venting; if the mixed gas dry-type flame arrester (12) does not completely extinguish flame, fire is continuously arrested in the mixed gas fire-arresting explosion-venting device (11); if the fire is not completely retarded at the moment, the explosion suppression device (10) continues to suppress the flame, and the low negative pressure gas dry-type flame arrester (5), the low negative pressure gas fire-retarding explosion-venting device (4), the high negative pressure gas dry-type flame arrester (27) and the high negative pressure gas fire-retarding explosion-venting device (28) continue to retard the fire and release the explosion, so that the safety of the high and low negative pressure gas extraction pump is protected; if flame occurs in the explosion suppression device section of the conveying pipeline, the gas explosion suppression device (10), the low negative pressure gas dry-type flame arrester (5), the low negative pressure gas fire-retarding explosion-releasing device (4), the high negative pressure gas dry-type flame arrester (27) and the high negative pressure gas fire-retarding explosion-releasing device (28) protect the safety of the high and low negative pressure gas extraction pump.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, high-speed airflow injection principle is adopted to mix high-low negative pressure extracted gas, and a mode of online water level control wet-type diffusion is combined, so that the pump holding phenomenon of a gas extraction pump during power generation by mixing high-low negative pressure gas is solved, and the gas with high and low concentrations can be uniformly mixed;
the power of the internal combustion generator set is jointly adjusted, and the bypass adjustment, the diffusion and mixing are carried out, so that the working state of a mixed gas conveying pipeline is kept in a positive pressure state, the air inlet pressure of the internal combustion generator set is stable, and the phenomenon of 'knocking' of the internal combustion generator set caused by the pressure and concentration mutation of extracted gas is avoided. Meanwhile, the mixed gas conveying pipeline keeps positive pressure, and dehydration, backflow and discharge are realized by the aid of the gas conveying pipeline, so that the moisture content in gas is reduced;
the reflux water seal is added to reflux and separate water, so that the phenomenon that the original dehydration technology is 'removed but not removed' is avoided. The lower part of an air inlet main pipe of the internal combustion engine is connected with a float type drain valve to discharge water cold separated out in gas pressurization, so that the water is prevented from entering a combustion chamber of the internal combustion engine, and the power generation efficiency is improved;
by the method, the low-negative-pressure extracted gas with lower concentration is safely and reliably used for power generation of the internal combustion generator set, the gas utilization rate in China is improved, and energy conservation and emission reduction in the coal industry are promoted.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural diagram of a gas fire-retarding and explosion-venting device;
FIG. 3 is a schematic structural view of an injection mixer;
FIG. 4 is a schematic structural diagram of a gas explosion suppression device;
FIG. 5 is a schematic view of the structure of the on-line gas diffuser;
FIG. 6 is a schematic structural diagram of a backflow water seal;
in the upper diagram: the system comprises a low negative pressure gas relief valve 1, a low negative pressure gas delivery valve 2, a low negative pressure gas pressure sensor 3, a low negative pressure gas fire-retardant explosion-venting device 4, a low negative pressure gas dry-type flame arrester 5, an A conversion valve 6, a B conversion valve 7, an injection mixing dispenser 8, a mixed gas concentration sensor 9, a gas explosion suppression device 10, a mixed gas fire-retardant explosion-venting device 11, a mixed gas dry-type flame arrester 12, a gas split flow regulating valve 13, an online gas release device 14, a filter dehydrator 15, a mixed gas pressure sensor 16, an internal combustion engine pressure regulating valve 17, a backflow water seal 18, an internal combustion engine supercharger 19, an intercooler 20, an internal combustion engine air inlet main pipe 21, a float-type drain valve 22, an internal combustion generator set 23, a C conversion valve 24, a D25, an E conversion valve 26, a high negative pressure gas dry-type flame arrester 27, a high negative pressure gas fire-retardant explosion, A high negative pressure gas delivery valve 30, a high negative pressure gas blow-off valve 31;
4.1 of a liquid level meter, 4.2 of a lower porous plate, 4.3 of a stainless steel wool fire retardant core, 4.4 of an upper porous plate, 4.5 of an air inlet bent pipe, 4.6 of a metal structure body, 4.7 of an explosion venting sheet, 4.8 of an air outlet bent pipe, 4.9 of an automatic water replenishing switch, 4.10 of a water replenishing valve and 4.11 of a water discharging valve;
a nozzle 8.1, a negative pressure chamber 8.2, a gas mixing section 8.3, a gas diffusion section 8.4 and a suction nozzle 8.5;
10.1 of an atomizing spray head, 10.2 of a connecting flange seat A, 10.3 of a connecting flange seat B, 10.4 of a filter, 10.5 of a valve, 10.6 of a high-pressure connecting water pipe, 10.7 of a high-pressure water delivery main pipe and 10.8 of a mixed gas delivery pipeline;
14.1 of a temperature monitor, 14.2 of a gas pressure limiting pipe, 14.3 of a liquid level meter, 14.4 of a diffuser body, 14.5 of a gas bypass connecting pipe, 14.6 of a dry flame arrester, 14.7 of a water replenishing valve, 14.8 of water, 14.9 of a heater and 14.10 of a water drain valve;
the water seal device comprises a water inlet bent pipe 18.1, a gas residual gas discharge valve 18.2, a water seal body 18.3, a water outlet pipe 18.4, water for water seal 18.5 and a water discharge valve 18.6.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Referring to the attached figure 1, the invention provides a coal mine high-low negative pressure gas extraction mixing conveying power generation device, which adopts the technical scheme that: comprises a low negative pressure gas relief valve 1, a low negative pressure gas delivery valve 2, a low negative pressure gas pressure sensor 3, a low negative pressure gas fire-retarding explosion-venting device 4, a low negative pressure gas dry-type flame arrester 5, an A conversion valve 6, a B conversion valve 7, an injection mixer 8, a mixed gas concentration sensor 9, a gas explosion suppression device 10, a mixed gas fire-retarding explosion-venting device 11, a mixed gas dry-type flame arrester 12, a gas shunt regulating valve 13, an online gas diffuser 14, a filter dehydrator 15, a mixed gas pressure sensor 16, an internal combustion engine pressure regulating valve 17, a backflow water seal 18, an internal combustion engine supercharger 19, an intercooler 20, an internal combustion engine air inlet main pipe 21, a float-type drain valve 22, an internal combustion generator set conversion valve 23, a C conversion valve 24, a D25, an E conversion valve 26, a high negative pressure dry-type flame arrester 27, a high negative pressure gas fire-retarding explosion-venting device 28, the high negative pressure gas extraction pump is communicated with the injection mixer 8 through a high negative pressure gas fire-retardant explosion-relief device 28, a high negative pressure gas dry-type flame arrester 27E switching valve 26 and a C switching valve 24, the low negative pressure gas extraction pump is communicated with the injection mixer 8 through a low negative pressure gas fire-retardant explosion-relief device 4, a low negative pressure gas dry-type flame arrester 5 and an A switching valve 6, the rear end of the injection mixer 8 is sequentially connected with a plurality of groups of gas explosion suppression devices 10, and the high negative pressure gas extraction pump is connected with the filter dehydrator 15, the backflow water seal 18, the internal combustion engine supercharger 19, the intercooler 20, the internal combustion engine air inlet main pipe 21, the float-type drain valve 22 and one or more groups of internal combustion generator sets 23 through the mixed fire-retardant gas explosion-relief device 11, the mixed gas dry-type flame arrester 12, the gas shunt regulating valve 13 and the online gas radiator 14.
Wherein, the low negative pressure gas fire-retardant explosion-venting device 4, the low negative pressure gas dry-type flame arrester 5, the high negative pressure gas dry-type flame arrester 27, the high negative pressure gas fire-retardant explosion-venting device 28, the mixed gas fire-retardant explosion-venting device 11 and the mixed gas dry-type flame arrester 12 are connected through respective related pipelines to form a gas fire-retardant explosion-venting system; the low negative pressure gas relief valve 1, the A change-over valve 6, the B change-over valve 7, the injection mixer 8, the mixed gas concentration sensor 9, the C change-over valve 24, the D change-over valve 25 and the E change-over valve 26 are connected through respective related pipelines to form a gas mixing system; the gas shunt regulating valve 13, the on-line gas diffuser 14, the mixed gas pressure sensor 16, the internal combustion engine pressure regulating valve 17 and the internal combustion generator set 23 are connected through respective related pipelines to form a gas pipeline pressure control system; the mixed gas fire-retarding explosion-venting device 11, the mixed gas dry-type flame arrester 12, the filtering dehydrator 15, the backflow water seal 18, the internal combustion engine supercharger 19, the intercooler 20, the internal combustion engine intake manifold 21 and the float-type drain valve 22 are connected through respective related pipelines to form a gas filtering dehydration system;
under the action of a high-negative-pressure gas extraction pump, extracted gas with higher concentration enters an injection mixer 8 through a high-negative-pressure gas delivery valve 30, a high-negative-pressure gas fire-retardant explosion-relief device 28, a high-negative-pressure gas dry-type fire arrestor 27, an E conversion valve 26 and a C conversion valve 24, high-speed gas airflow is formed in the injection mixer 8, low-negative-pressure gas extracted gas with lower concentration is obtained through a low-negative-pressure gas delivery valve 2, a pressure gas fire-retardant explosion-relief device 4, a low-negative-pressure gas dry-type fire arrestor 5 and an A conversion valve 6 in a negative-pressure injection mode, the phenomenon that the gas extraction pump is blocked due to mutual interference when two paths of gas are intersected is avoided, and the high-negative-pressure extracted gas is uniformly mixed in the injection mixer 8; if the gas concentration after the high-low negative pressure extracted gas is mixed is not lower than the requirement of the internal combustion generator 23 and is generally not lower than 10%, the high-low negative pressure extracted gas is changed to enter the inlet of the injection mixer 8 by adjusting the on-off states of the A conversion valve 6, the B conversion valve 7, the C conversion valve 24, the D conversion valve 25 and the E conversion valve 26, all high-pressure extracted gas is injected by the low-negative pressure extracted gas, the mixed gas meets the requirement of the internal combustion generator 23, and part of the low-negative pressure extracted gas is evacuated through the low-negative pressure gas diffusing valve 1. The power generation equipment comprises a filter dehydrator (15), a mixed gas pressure sensor (16), an internal combustion engine pressure regulating valve (17), an internal combustion engine supercharger (19), an intercooler (20), an internal combustion engine air inlet main pipe (21), a float type drain valve (22) and an internal combustion generator set (23), wherein two sets of power generation equipment main bodies are illustrated in the attached drawing 1, and the number of the power generation equipment main bodies can be increased in practical application.
The mixed gas enters an online gas diffuser 14 through a gas explosion suppression device 10, a mixed gas fire-retardant explosion-relief device 11 and a mixed gas dry-type flame arrester 12, a gas shunt regulating valve 13 which plays a role of bypassing and diffusing the gas is arranged in front of the online gas diffuser 14, the opening degree of the gas shunt regulating valve is regulated according to the power generation requirement of an internal combustion generator set 23, and a mixed gas pressure sensor 16 in front of an internal combustion engine pressure regulating valve 17 is kept to be not lower than 3kPa, namely the pressure in a gas conveying pipeline is kept to be basically stable.
Preferably, after the high-low negative pressure extracted gas containing more water passes through the high-negative pressure gas dry-type flame arrester 27 and the low-negative pressure gas dry-type flame arrester 5 respectively, most of water is removed and flows back to the high-negative pressure gas fire-retarding explosion-venting device 28 and the low-negative pressure gas fire-retarding explosion-venting device 4; most of moisture in mixed gas from the gas explosion suppression device 10 is accumulated after passing through the mixed gas fire-retardant explosion-release device 11, the mixed gas passes through the mixed gas dry-type fire arrestor 12 to further remove the moisture in the mixed gas and flows back to the mixed gas fire-retardant explosion-release device 11, and the liquid water overflows from the mixed gas fire-retardant explosion-release device into a backflow water seal 18; the mixed gas is further dewatered by a filter dehydrator 15 and reflows to a reflux water seal 18. The collected liquid water is discharged from the return water seal 18. The mixed gas is decompressed and stabilized by a pressure regulating valve 17 of the internal combustion engine, sucked and pressurized by a supercharger 19 of the internal combustion engine, cooled and cooled by an intercooler 20, enters an air inlet main pipe 21 of the internal combustion engine, and the separated liquid water enters a float type drain valve 22 and is discharged.
Preferably, the gas explosion suppression device 10 has two modes, one mode is a wet method, namely, fine water mist is sprayed in the mixed gas conveying pipeline, and the fine water mist and gas are continuously mixed and conveyed in the whole process; secondly, dry method, namely spraying carbon dioxide when flame is monitored in the mixed gas pipeline; one of the two modes can be selected to form the gas explosion suppression system.
Referring to the attached drawing 2, the low negative pressure gas fire-retardant explosion venting device 4 and the high negative pressure gas fire-retardant explosion venting device 28 have the same structure and respectively comprise a liquid level meter 4.1, a lower porous plate 4.2, a stainless steel wool fire-retardant core 4.3, an upper porous plate 4.4, an air inlet bent pipe 4.5, a metal structural body 4.6, an explosion venting sheet 4.7, an air outlet bent pipe 4.8, an automatic water replenishing switch 4.9, a water replenishing valve 4.10, a water drain valve 4.11 and water, wherein an inner cavity of the metal structural body 4.6 is provided with the air inlet bent pipe 4.5 and the air outlet bent pipe 4.8, the lower side is provided with the stainless steel wool fire-retardant core 4.3 and the upper porous plate 4.4, the top is provided with the explosion venting sheet 4.7, an inner opening of the air inlet bent pipe 4.5 penetrates through the stainless steel wool fire-retardant core 4.3 and the upper porous plate 4.4 to extend into the water in the inner cavity of the metal structural body 4.6, an inlet bent pipe; the extracted gas enters water from the air inlet elbow 4.5, then enters the inner cavity of the metal structure body 4.6 through the stainless steel wool fire retardant core 4.3, enters the air outlet elbow from the upper end of the air outlet elbow 4.8 and then flows out of the dry-wet fire retardant explosion venting device.
The stainless steel wool fire retardant core is restrained in the space between the lower porous plate 4.2 and the upper porous plate 4.4, the water surface wave crest caused by gas flow is suppressed, the gas inlet and the gas outlet are prevented from being directly communicated, the water-sealing fire retardant function is ensured, and extracted gas is separated and reflowed through most of the water brought out. When water carried by gas passes through the stainless steel wool fire retardant core 4.3, the 'cold wall quenching' fire retardant function of the stainless steel wool is also enhanced. Automatic water supply switch 4.9 maintains the surface of water invariable according to the water level automatic water supply of setting for, and level gauge 4.1 shows the dry and wet compound back-fire relief and explodes the interior water level height of ware, and when not using for a long time in winter, inside water is discharged by valve 4.11 that drains, and when the explosion accident appeared in the gas pipeline, the blast wave of explosion was upwards by the return bend 4.8 guide of giving vent to anger, rushes open and let out and explode piece 4.7 and let out and explode, and the protection is dry and wet compound back-fire relief and explodes the ware body.
Referring to the attached drawing 3, the injection mixer 8 provided by the invention is composed of a nozzle 8.1, a negative pressure chamber 8.2, a gas mixing section 8.3 and a gas diffusion section 8.4, an extraction gas pump is used as power, wherein one path of gas enters the nozzle 8.1 to generate high-speed airflow, negative pressure is formed in the negative pressure chamber 8.2, the other path of extracted gas is sucked through a suction nozzle 8.5, the two paths of extracted gas are uniformly mixed in the gas mixing section 8.3 and enter the gas diffusion section 8.4, and the pressure of the mixed extracted gas is recovered to a certain degree, so that the phenomenon that the two paths of gas interfere with each other to cause pump holding-down of the gas extraction pump is overcome.
Referring to the attached figure 4, the gas explosion suppression device 10 provided by the invention comprises an atomizing nozzle 10.1, an A connecting flange seat 10.2, a B connecting flange seat 10.3, a filter 10.4, a valve 10.5, a high-pressure connecting water pipe 10.6, a high-pressure water conveying main pipe 10.7 and a mixed gas conveying pipeline 10.8, wherein high-pressure water in the high-pressure water conveying main pipe 10.7 sequentially passes through the high-pressure connecting water pipe 10.6, the valve 10.5, the filter 10.4, the B connecting flange seat 10.3 and the A connecting flange seat 10.2 to enter the atomizing nozzle 10.1 to be atomized, and then flows downstream to be mixed with gas in the mixed gas conveying pipeline 10.8.
Compared with the prior water mist generator, the water mist generator has two advantages: firstly, the fog-forming interval shortens, and gas and water smoke mixing uniformity obtain further guarantee, and the reliability of suppressing flame and extinguishing flame is better. And secondly, the water mist generator has small volume, light weight and more convenient installation and maintenance.
Referring to the attached figure 5, the on-line gas diffuser 14 provided by the invention is composed of a temperature monitor 14.1, a gas pressure limiting pipe 14.2, a liquid level meter 14.3, a diffuser body 14.4, a gas bypass connecting pipe 14.5, a dry fire arrestor 14.6, a water replenishing valve 14.7, water 14.8, a heater 14.9 and a water drain valve 14.10, wherein the middle part of the diffuser body 14.4 penetrates through the gas pressure limiting pipe 14.2, the gas pressure limiting pipe 14.2 is a three-way pipe, the lower side of the gas pressure limiting pipe extends into the water 14.8, and the top of the diffuser body 14.4 is provided with the gas bypass connecting pipe 14.5 and the dry fire arrestor 14.6; gas enters and exits from the gas pressure limiting pipe 14.2, gas positive pressure is formed in the gas main pipe, partial water 14.8 in the gas pressure limiting pipe is pressed downwards into the peripheral diffuser body 14.4 to enable the water surface to rise, and the height difference between the inner water surface and the outer water surface is the gas pressure in the gas main pipe; when the gas pressure exceeds a set limit value, namely the gas pressure in the gas pressure limiting pipe 14.2 is moved out of the lowest end under the water surface, the primarily mixed gas flows out of the gas pressure limiting pipe, enters the diffuser body 14.4 through a water seal and is discharged to the atmosphere through the dry flame arrester 14.6, if the gas is extracted, the primarily mixed gas enters the gas bypass connecting pipe 14.5 and is discharged to the atmosphere through the dry flame arrester 14.6, so that the pressure of a gas conveying pipeline system is maintained in a set range.
Preferably, a water replenishing valve 14.7, a water drain valve 14.10, a temperature monitor 14.1 and a heater 14.9 are further arranged on the diffuser body 14.4, and the water replenishing valve 14.7 and the water drain valve 14.10 are used for adjusting and ensuring the water level and setting the pressure of a gas conveying pipeline system; the temperature monitor 14.1 and the heater 14.9 are used for preventing the inside of the dry-wet composite diffuser from being frozen when the dry-wet composite diffuser is used in cold regions in winter.
Referring to the attached figure 6, the backflow water seal 18 provided by the invention is composed of a water inlet bent pipe 18.1, a gas residual gas discharge valve 18.2, a water seal body 18.3, a water outlet pipe 18.4, water seal water 18.5 and a water discharge valve 18.6, wherein one side of the water seal body 18.3 is provided with the water outlet pipe 18.4, the other side of the water seal body is provided with the water inlet bent pipe 18.1, a water seal water 18.5 is arranged in an inner cavity, the bottom of the water seal body is provided with the water discharge valve 18.6, the top of the water seal body is provided with the gas residual gas discharge valve 18.2, and the inner end of the water inlet bent pipe.
Moisture dissociated from the gas conveying pipeline system enters the water seal body 18.3 through the water inlet elbow 18.1, contained gas escapes and accumulates at the upper part of the water seal body 18.3, and is discharged through the gas residual gas discharge valve 18.2. The water without gas or with little gas is filtered and recycled by the water outlet pipe 18.4 and reflows to the collecting tank. When the backflow water seal is not used or maintained, water seal water in the backflow water seal is discharged through the drain valve to be clean 18.5. Compared with the prior gas conveying pipeline system, the gas conveying pipeline system can discharge gas contained in the return water, prevent gas blockage, ensure that the return water is not smooth, cause serious water accumulation of a dewatering system, and cause adverse effects that the gas carries more water to enter a generator set to reduce the power generation power and the like.
The invention provides a coal mine high-low negative pressure gas extraction mixed conveying power generation method, which comprises the following steps:
firstly, preparation work: injecting water into the low negative pressure gas fire-retardant explosion-release device 4, the high negative pressure gas fire-retardant explosion-release device 28 and the online gas diffuser 14 to reach the set liquid level height; starting the gas explosion suppression device 10;
secondly, pumping and conveying gas: firstly, the gas split flow control valve 13, the C change-over valve 24, the D change-over valve 25 and the A change-over valve 6 are fully opened, and the B change-over valve 7 and the D change-over valve 25 are fully closed; then the high negative pressure gas delivery valve 30 is fully opened, and the high negative pressure gas relief valve 31 is gradually closed; and finally, the low negative pressure gas delivery valve 2 is opened fully and the low negative pressure gas relief valve 1 is closed in sequence. When the monitoring value of the mixed gas concentration sensor 9 is smaller than the lowest requirement of the internal combustion generator set 23, the low-negative-pressure gas relief valve 1 is partially opened properly until the mixed gas concentration reaches the standard; if the low negative pressure gas is relatively high in concentration and the high negative pressure gas is relatively high in concentration and has other purposes, the high negative pressure gas and the low negative pressure gas are changed to enter the inlet of the injection mixer 8 by adjusting the switching states of the A switching valve 6, the B switching valve 7, the C switching valve 24, the D switching valve 25 and the E switching valve 26, and the low negative pressure gas is used for injecting the high negative pressure gas;
thirdly, mixed gas power generation: starting the internal combustion generator set 23, gradually closing the opening of the gas flow dividing regulating valve 13, and gradually increasing the power generation power; after adjustment, the power of the internal combustion generator set 23 is increased to rated power or required proper power, the monitoring value of the mixed gas pressure sensor 16 is always kept to be not lower than 3kPa, and the stability is kept within a certain range;
fourthly, dehydrating and purifying gas: most of water brought away by the low-negative-pressure extracted gas through the low-negative-pressure gas fire-retardant explosion-release device 4 passes through the low-negative-pressure gas dry-type flame arrester 5, is removed and flows back to the low-negative-pressure gas fire-retardant explosion-release device 4; the water taken away by the high negative pressure gas extraction through the high negative pressure gas fire-retardant explosion-venting device 28 flows through the high negative pressure gas dry-type flame arrester 27, and most of the water flows back to the high negative pressure gas fire-retardant explosion-venting device 28; the mixed gas passes through a fine water mist explosion suppression device, condensed water is gathered in a mixed gas fire-retardant explosion venting device 11, the mixed gas is subjected to partial water removal through a mixed gas dry-type flame arrester 12 and flows back to the mixed gas fire-retardant explosion venting device 11, and the mixed gas fire-retardant explosion venting device 11 overflows into a backflow water seal 18 after the liquid level reaches a certain height and then flows back to an atomization pool for recycling. The mixed gas continuously flows through the filter dehydrator 15, particles in the mixed gas are filtered, part of water is removed, and the mixed gas and the water are refluxed to the reflux water seal 18; mixed gas is sucked and pressurized by a supercharger 19 of the internal combustion engine, and is cooled by an intercooler 20, liquid water is separated out from an air inlet main pipe 21 of the internal combustion engine, and the water is discharged through a float type drain valve 22;
fifthly, controlling gas conveying pressure: the monitoring pressure of the set low negative pressure gas pressure sensor 3 and the high negative pressure gas pressure sensor 29 is not higher than 15kPa, the monitoring pressure of the mixed gas pressure sensor 16 is not lower than 3kPa, the water seal diffusion pressure set in the online gas diffuser 14 is not higher than 6kPa, and the water seal diffusion pressure set in the backflow water seal 18 is not lower than 15 kPa; when the device normally operates, the resistance of various fire-retardant filtering devices is gradually increased, when the low-negative-pressure gas pressure sensor 3 and the high-negative-pressure gas pressure sensor 29 are close to the set upper limit value and the mixed gas pressure sensor 16 is still lower than 3kPa, the core of each fire-retardant filtering device needs to be cleaned, the internal combustion generator set 23 is suddenly stopped, the mixed gas is automatically diffused and emptied through the water seal in the online gas diffuser 14, and the pumping gas pump is prevented from being blocked;
sixthly, fire resistance and explosion relief of the conveying pipeline: if the internal combustion generator set 23 is tempered to cause deflagration in the gas conveying pipeline, the flame is prevented from returning by the mixed gas dry-type flame arrester 12, and the mixed gas is guided in the mixed gas fire-retarding explosion-venting device 11 to be vented to explode; if the mixed gas dry-type flame arrester 12 does not extinguish the flame completely, the mixed gas fire-arresting explosion-venting device 11 continues to arrest the flame; if the fire is not completely prevented, the explosion suppression device 10 continues to suppress the flame, and the low negative pressure gas dry type flame arrester 5, the low negative pressure gas fire-retardant explosion-release device 4, the high negative pressure gas dry type flame arrester 27 and the high negative pressure gas fire-retardant explosion-release device 28 continue to retard the fire and release the explosion, so that the safety of the high and low negative pressure gas extraction pump is protected; if flame occurs in the explosion suppression device section of the conveying pipeline, the gas explosion suppression device 10, the low negative pressure gas dry type flame arrester 5, the low negative pressure gas fire-retarding explosion-releasing device 4, the high negative pressure gas dry type flame arrester 27 and the high negative pressure gas fire-retarding explosion-releasing device 28 protect the safety of the high and low negative pressure gas extraction pump.
The above description is only a few of the preferred embodiments of the present invention, and any person skilled in the art may modify the above-described embodiments or modify them into equivalent ones. Therefore, any simple modifications or equivalent substitutions made in accordance with the technical solution of the present invention are within the scope of the claims of the present invention.