阅读说明：本技术 一种煤矿井下煤层瓦斯含量自动化测量装置及测量方法 (Automatic measuring device and method for gas content of coal seam in coal mine ) 是由 康建宏 王有湃 刘应科 夏同强 于 2019-09-24 设计创作，主要内容包括：一种煤矿井下煤层瓦斯含量自动化测量装置及测量方法,由PLC控制器控制系统中的电磁阀Ⅰ、电磁阀Ⅱ、电磁阀Ⅲ、电磁阀Ⅳ、电磁阀Ⅴ、防爆伺服电机Ⅰ、防爆伺服电机Ⅱ、防爆高速电机的开闭和启停,中央多功能处理显示器通过感知液体压力传感器Ⅰ、液体压力传感器Ⅱ、气体压力传感器、温度传感器、甲烷浓度传感器、智能流量计的测量数据,对损失瓦斯量进行估计；随后不打开煤样罐,通过预设程序打碎煤样,减少瓦斯散失；最后系统自动校正各阶段的瓦斯含量,并计算出最终的煤层瓦斯含量,出具报告。本发明能够通过触控屏实现一键式操作,自动进行瓦斯解吸量的计量,大幅度提高煤层瓦斯含量的测量效率,且测定结果准确,结构简单、工艺操作方便。(An automatic measuring device and a measuring method for the gas content of a coal seam under a coal mine are disclosed, wherein a PLC (programmable logic controller) controls the opening, closing and starting of a solenoid valve I, a solenoid valve II, a solenoid valve III, a solenoid valve IV, a solenoid valve V, an explosion-proof servo motor I, an explosion-proof servo motor II and an explosion-proof high-speed motor in a system, and a central multifunctional processing display estimates the lost gas amount by sensing the measured data of a liquid pressure sensor I, a liquid pressure sensor II, a gas pressure sensor, a temperature sensor, a methane concentration sensor and an intelligent flowmeter; then, breaking the coal sample by a preset program without opening the coal sample tank, so as to reduce the loss of gas; and finally, automatically correcting the gas content of each stage by the system, calculating the final coal bed gas content, and issuing a report. The invention can realize one-key operation through the touch screen, automatically measure the gas desorption amount, greatly improve the measurement efficiency of the coal bed gas content, and has accurate measurement result, simple structure and convenient process operation.)

1. An automatic measuring device for gas content of a coal seam in a coal mine comprises a coal sample tank (12) and a combined blade (11) arranged in the coal sample tank (12), wherein the combined blade (11) is driven by an explosion-proof high-speed motor (37) arranged on the coal sample tank (12), and is characterized by further comprising a temperature sensor (1) for sensing ambient temperature and a gas pressure sensor I (2) for sensing atmospheric pressure, the upper end of the coal sample tank (12) is connected with one end of a needle valve (13) through a pipeline, a gas-solid separator (10) and an inlet of a three-way joint I (7) connected behind a methane concentration sensor (9) are sequentially arranged on the pipeline connected with the other end of the needle valve (13), a first outlet of the three-way joint I (7) is connected to an intelligent flowmeter (6) through an electromagnetic valve I (5), and a second outlet of the three-way joint I (7) is connected with an inlet of a three-way joint VI (40), a first outlet of the three-way joint VI (40) is connected with a gas pressure sensor II (39), a second outlet of the three-way joint VI (40) is connected with an inlet of a three-way joint V (34), a first outlet of the three-way joint V (34) is connected to an inlet of a three-way joint III (19) through an electromagnetic valve III (20), a first outlet of the three-way joint III (19) is connected with an inlet at the top end of the measuring cylinder I (16), and a second outlet of the three-way joint III (19) is connected to a first inlet of a three-way joint II (18) through an electromagnetic valve II (17); a second outlet of the three-way joint V (34) is connected to an inlet of the three-way joint IV (33) through an electromagnetic valve IV (31), a first outlet of the three-way joint IV (33) is connected with an inlet at the top end of the measuring cylinder II (29), and a second outlet of the three-way joint IV (33) is connected to a second inlet of the three-way joint II (18) through an electromagnetic valve V (32); the outlet of the three-way joint II (18) is connected with an explosion-proof vacuum pump (14); the bottom ends of the inner parts of the measuring cylinder I (16) and the measuring cylinder II (29) are respectively provided with a liquid pressure sensor I (24) and a liquid pressure sensor II (25);

the side wall of the bottom end of the measuring cylinder I (16) is communicated to the bottom of the liquid collection tank I (21) through a rubber tube I (23), an electromagnetic valve VI (35) is installed on the rubber tube I (23), an explosion-proof servo motor I (22) is installed at the bottom end of the liquid collection tank I (21), two ends of a worm I (15) are fixed on an equipment shell through bearings, and the explosion-proof servo motor I (22) drives a worm wheel to drive the worm I (15) to rotate, so that the liquid collection tank I (21) moves up and down along the worm I (15);

The side wall of the bottom end of the measuring cylinder II (29) is communicated to the bottom of the liquid collecting tank II (28) through a rubber tube II (26), an electromagnetic valve VII (36) is installed on the rubber tube II (26), an explosion-proof servo motor II (27) is installed at the bottom end of the liquid collecting tank II (28), two ends of a worm II (30) are fixed on an equipment shell through a bearing, and the explosion-proof servo motor II (27) drives a worm wheel to drive the worm II (30) to rotate, so that the liquid collecting tank II (28) moves up and down along the worm II (30);

the temperature sensor (1), the gas pressure sensor I (2), the gas pressure sensor II (39), the intelligent flowmeter (6), the methane concentration sensor (9), the liquid pressure sensor I (24) and the liquid pressure sensor II (25) respectively transmit detected signals to an input port of the central multifunctional processing display (3) through lines, and an output port of the central multifunctional processing display (3) is connected to the PLC (4) through a line;

the PLC (4) controls the opening and closing of the electromagnetic valve I (5), the electromagnetic valve II (17), the electromagnetic valve III (20), the electromagnetic valve IV (31), the electromagnetic valve V (32), the electromagnetic valve VI (35), the electromagnetic valve VII (36) and the explosion-proof vacuum pump (14) by receiving an instruction of the central multifunctional processing display (3), and controls rotating speed signals of the explosion-proof high-speed motor (37), the explosion-proof servo motor I (22) and the explosion-proof servo motor II (27).

2. the automatic measuring device for the gas content in the coal seam of the coal mine according to claim 1, characterized in that an electromagnetic heating ring (38) is installed on the side surface of the coal sample tank (12).

3. the automatic measuring device for the gas content in the coal seam of the coal mine as claimed in claim 1 or 2, wherein the shaft part of the combined blade (11) is connected to the top end of the coal sample tank (12) through a mechanical sealing element.

4. the automatic measuring device of the gas content in the coal mine underground coal seam according to claim 1 or 2, characterized in that the intelligent flow meter (6) has two gears, which are respectively gear I: range 0-500 ml/min, gear II: the measuring range is 0-1000 ml/min.

5. The automatic measuring device for the gas content in the coal seam of the coal mine according to claim 1 or 2, characterized in that the coal sample tank (12) can contain at least 1000g of pulverized coal and has a pressure resistance higher than 5 Mpa.

6. the automatic measuring device for the gas content in the coal mine underground coal seam according to claim 3, wherein the measuring ranges of the liquid pressure sensor I (24) and the liquid pressure sensor II (25) are 0.1-1 MPa, and the accuracy is 0.001 MPa; the measurement ranges of the gas pressure sensor I (2) and the gas pressure sensor II (39) are 0.1-1 MPa, and the precision is 0.001 MPa; the measurement range of the temperature sensor (1) is 0-95 ℃, and the precision is 0.05 ℃; the range of the methane concentration sensor (9) is 0-100.00% CH4, and the accuracy is 1.00% CH 4.

7. the automatic measuring device for the gas content in the coal mine underground coal seam according to claim 4, wherein the rotating speeds of the explosion-proof servo motor I (22) and the explosion-proof servo motor II (27) are lower than 3000 r/min; the rotating speed of the explosion-proof high-speed motor (37) is higher than 500 r/min; the volumes of the measuring cylinder I (16) and the measuring cylinder II (29) are less than or equal to 1500ml, and the volumes of the liquid collecting tank I (21) and the liquid collecting tank II (28) are less than or equal to 1500 ml.

8. an automatic measurement method for gas content of a coal seam under a coal mine is characterized by comprising the following steps:

Filling a nontoxic, harmless, anticorrosive and colored liquid into a measuring cylinder I (16) and a measuring cylinder II (29), starting a measuring device, supplying power to the whole device by an explosion-proof battery (8), clicking a sampling starting button on a central multifunctional processing display (3) when drilling is started in a coal mine, removing gangue, mud and ground coke-burning parts after coal scraps are taken out by drilling, weighing, quickly loading the coal scraps into a coal sample tank (12) and screwing down, clicking a sampling stopping button on the central multifunctional processing display (3), automatically recording the time t1 from the beginning of drilling to the loading of the coal sample into the coal sample tank (12) by the central multifunctional processing display (3), and then inputting the weighed coal sample mass m in a prompt window;

secondly, sensing the ambient temperature T and the atmospheric pressure P in real time by a temperature sensor (1) and a gas pressure sensor I (2), and respectively transmitting the ambient temperature T and the atmospheric pressure P to a central multifunctional processing display (3) through lines;

thirdly, a needle valve (13) is opened, a button for starting natural desorption and measurement on the central multifunctional processing display (3) is clicked, the desorbed gas in the coal sample tank (12) firstly passes through a gas-solid separator (10) to filter coal dust floating along with the gas flow, then the concentration of the desorbed gas is sensed through a methane concentration sensor (9), and the result is transmitted to the central multifunctional processing display (3);

when data of the methane concentration sensor (9) is transmitted to the central multifunctional processing display (3), the PLC (4) controls the solenoid valve I (5) to be opened, the solenoid valve IV (31) and the solenoid valve III (20) to be closed, the gas firstly passes through the intelligent flowmeter (6) and transmits a result to the central multifunctional processing display (3), the central multifunctional processing display (3) judges a measuring state according to the gas flow and sends an instruction, and the fifth step is started;

When the gas flow is sensed to be 500-1000 ml/min, the intelligent flow meter (6) adopts the measurement data of the gear II; when the gas flow is sensed to be between 100 and 500ml/min, the intelligent flowmeter (6) adopts the measurement data of a gear I and transmits the data to the central multifunctional processing display (3), wherein the measurement data of a gear II is adopted when the measurement value is 500 ml/min;

when the gas flow is sensed to be 0-100 ml/min, the PLC (4) controls the solenoid valve I (5), the solenoid valve IV (31), the solenoid valve II (17) and the solenoid valve V (32) to be closed, the solenoid valve III (20) and the solenoid valve VI (35) to be opened, the gas enters the measuring cylinder I (16) through the pipeline, the gas pressure sensor II (39) communicated with the pipeline senses the pressure of desorbed gas in real time and transmits data to the central multifunctional processing display (3), the liquid pressure sensor I (24) measures and calculates the gas amount of the desorbed gas by sensing the hydraulic pressure change caused by the liquid level change in the measuring cylinder I (16), and the measured and calculated value is transmitted to the central multifunctional processing display (3); in the process, gas enters a measuring cylinder I (16), liquid in the measuring cylinder I (16) is discharged into a liquid collecting tank I (21) through a rubber tube I (23), at the moment, a central multifunctional processing display (3) controls the operation of an explosion-proof servo motor I (22) through a PLC (4) according to the measurement data of a gas pressure sensor II (39) to drive a turbine to rotate a worm I (15), so that the liquid collecting tank I (21) moves up and down along the worm I (15), the gas pressure detected by the gas pressure sensor II (39) is ensured to be atmospheric pressure all the time, the liquid level in the liquid collecting tank I (21) and the liquid level in the measuring cylinder I (16) are kept parallel, and the pressure generated by hydraulic pressure difference is eliminated;

when the liquid in the measuring cylinder I (16) is less than 1/6 of the height of the measuring cylinder I (16), a PLC (4) controls an electromagnetic valve I (5), an electromagnetic valve III (20) and an electromagnetic valve V (32) to be closed, an electromagnetic valve IV (31), an electromagnetic valve II (17) and an electromagnetic valve VII (36) to be opened, the gas in the pipeline enters a measuring cylinder II (29), a gas pressure sensor II (39) communicated with the pipeline senses the pressure of the desorbed gas in real time and transmits data to a central multifunctional processing display (3), and a liquid pressure sensor II (25) measures and calculates the amount of the desorbed gas by sensing the hydraulic pressure change caused by the liquid level change in the measuring cylinder II (29) and transmits the measured and calculated value to the central multifunctional processing display (3); in the process, gas enters a measuring cylinder II (29), liquid in the measuring cylinder II (29) is discharged into a liquid collecting tank II (28) through a rubber tube II (26), at the moment, the central multifunctional processing display (3) controls the operation of an explosion-proof servo motor II (27) through a PLC (4) according to the measurement data of a gas pressure sensor II (39) to drive a turbine to rotate a worm II (30), so that the liquid collecting tank II (28) moves up and down along the worm II (30), the gas pressure detected by the gas pressure sensor II (39) is ensured to be atmospheric pressure all the time, the liquid level in the liquid collecting tank II (28) and the measuring cylinder II (29) is kept parallel, and the pressure generated by hydraulic pressure difference is eliminated;

meanwhile, the PLC (4) controls the explosion-proof vacuum pump (14) to be started, gas in the measuring cylinder I (16) is pumped out, and liquid in the liquid collecting tank I (21) is sucked back to the measuring cylinder I (16); similarly, when the liquid amount in the equivalent cylinder II (29) is less than 1/6 of the height of the measuring cylinder II (29), the PLC (4) controls the electromagnetic valve I (5), the electromagnetic valve IV (31) and the electromagnetic valve II (17) to be closed, the electromagnetic valve III (20), the electromagnetic valve V (32), the electromagnetic valve VI (35) and the explosion-proof vacuum pump (14) to be opened, the gas passage is switched to be measured by the measuring cylinder I (16), the liquid is filled again by pumping and cleaning the gas in the measuring cylinder II (29), and the operation is repeated in a circulating manner;

recording the volume of desorbed gas every 30s in the process of measuring the amount of gas desorbed underground, and when continuously recording for 60min or the desorbed amount is less than 2ml/min, automatically stopping the measurement of the amount of gas desorbed naturally underground by the system, and simultaneously automatically recording the measurement time t2 of the amount of gas desorbed naturally underground and the amount of gas desorbed naturally underground V2;

ninthly, after the underground natural desorption gas volume is measured, the central multifunctional processing display (3) controls the explosion-proof high-speed motor (37) to drive the combined blade (11) to break the coal sample through the PLC (4) according to a preset coal sample breaking program, simultaneously the electromagnetic heating ring is electrified to heat the coal sample in the coal sample tank (12), desorption is accelerated, and the desorbed gas volume is automatically measured and recorded according to the steps of (c), (d), (c) and (c); after continuous smashing for 10min, the system automatically stops the smashing program, then continues to measure for 30min, namely the determination of the residual gas content is completed, and the desorption amount of the smashed gas is recorded as V3;

after the gas desorption amount of each stage at the red (R) is measured, the system rapidly calculates the lost gas amount V1 by utilizing a preset gas desorption dynamics fitting model according to the recorded coal sample desorption data, and automatically performs gas volume correction and calculation of the desorbed gas concentration on the gas desorption amount of each stage, thereby obtaining the coal bed gas content;

after the measuring and calculating process is finished, the explosion-proof vacuum pump (14) sucks all liquid into the measuring cylinder I (16) and the measuring cylinder II (29), and meanwhile, the electromagnetic valve VI (35), the electromagnetic valve VII (36), the electromagnetic valve IV (31), the electromagnetic valve V (32), the electromagnetic valve II (17) and the electromagnetic valve III (20) are all closed, so that the liquid in the measuring cylinder I (16) and the measuring cylinder II (29) cannot overflow in the carrying process; meanwhile, the needle valve (13) is closed to prevent sundries from entering the pipeline system;

And taking out the coal sample, cleaning the instrument and automatically issuing a measurement report.

9. The method for automatically measuring the gas content in the coal mine underground coal seam according to claim 8, wherein a gas desorption kinetic fitting model is as follows:

wherein: vt is the total amount of gas desorbed over time t;

v ∞ is the total amount of gas desorbed over an infinite time;

phi is a constant;

r0 is the coal particle radius;

df is the diffusion coefficient;

lambda and beta are fractional order parameters;

t is the desorption time.

10. the method for automatically measuring the gas content in the coal mine underground coal seam according to claim 8, wherein the liquid in the step (i) is a matching liquid of potassium permanganate and water, and the ratio of potassium permanganate to water is 1: 100.

Technical Field

The invention relates to a coal seam gas content measuring device, in particular to an automatic measuring device and method for coal seam gas content in a coal mine, and belongs to the technical field of coal mine gas disaster prevention and control.

Background

the coal bed gas content is one of important parameters for predicting gas emission quantity, evaluating gas extraction effect and predicting coal and gas outburst risk, the coal bed gas content is generally determined by an underground desorption method in China at present, and a national standard underground direct determination method of coal bed gas content (GB/T23250) 2009 is formulated. However, how to quickly and accurately measure the coal seam gas content is a difficult problem to be solved urgently in the field of coal mine gas control.

at present, the disclosed patent documents, such as a gas desorption instrument with publication number CN102706768A disclosed on 10, 3/2012 of chinese invention patent, control the experimental process by a single chip microcomputer, monitor the water level height, analyze and calculate the change rule of the gas desorption amount with time, and realize the intelligent determination of the gas desorption amount, and the gas desorption instrument adopts a water drainage and gas collection method, and the bubbles generated by the desorbed gas cause serious fluctuation of the water surface and influence the reading reliability; in addition, the initial gas amount of desorption is large, the water amount is reduced quickly, and the manual reading is inaccurate. The device for measuring the outburst-prevention gas content of the coal bed, disclosed by the Chinese invention patent No. CN202916270U on 5/1/2013, has the advantages that manual reading is still needed, the volume of a measuring cylinder is fixed, and the excess part cannot be measured; the collected coal sample is required to be sent to a ground laboratory for measuring the content of residual gas, the measuring period is long, and the gas is easy to dissipate in the transportation process, so that the measuring result is small; the measured data needs to be calculated and fitted manually, the process is complicated, and errors are easy to occur.

disclosure of Invention

the invention aims to provide an automatic measuring device and method for the gas content of an underground coal seam of a coal mine, which can automatically measure the gas desorption amount, greatly improve the measuring efficiency of the gas content of the coal seam, have accurate data, reduce the deviation rate of experimental data, have a simple system structure and are convenient in process operation.

in order to achieve the purpose, the invention provides an automatic measuring device for the gas content of a coal seam under a coal mine, which comprises a coal sample tank and a combined blade arranged in the coal sample tank, wherein the combined blade is driven by an explosion-proof high-speed motor arranged on the coal sample tank, the automatic measuring device also comprises a temperature sensor for sensing the ambient temperature and a gas pressure sensor I for sensing the atmospheric pressure, the upper end of the coal sample tank is connected with one end of a needle valve through a pipeline, a gas-solid separator and a methane concentration sensor are sequentially arranged on the pipeline connected with the other end of the needle valve and then connected with an inlet of a three-way joint I, a first outlet of the three-way joint I is connected to an intelligent flowmeter through an electromagnetic valve I, a second outlet of the three-way joint I is connected with an inlet of a three-way joint VI, a first outlet of the three-way joint VI is connected with a gas pressure, a first outlet of the three-way joint V is connected to an inlet of a three-way joint III through a solenoid valve III, a first outlet of the three-way joint III is connected with an inlet at the top end of the measuring cylinder I, and a second outlet of the three-way joint III is connected to a first inlet of a three-way joint II through a solenoid valve II; a second outlet of the three-way joint V is connected to an inlet of the three-way joint IV through an electromagnetic valve IV, a first outlet of the three-way joint IV is connected with an inlet at the top end of the measuring cylinder II, and a second outlet of the three-way joint IV is connected to a second inlet of the three-way joint II through the electromagnetic valve V; the outlet of the three-way joint II is connected with an explosion-proof vacuum pump; the bottom ends of the inner parts of the measuring cylinder I and the measuring cylinder II are respectively provided with a liquid pressure sensor I and a liquid pressure sensor II;

the side wall of the bottom end of the measuring cylinder I is communicated to the bottom of the liquid collecting tank I through a rubber pipe I, a solenoid valve VI is installed on the rubber pipe I, an explosion-proof servo motor I is installed at the bottom end of the liquid collecting tank I, two ends of a worm I are fixed on an equipment shell through bearings, the explosion-proof servo motor I drives a worm wheel to drive the worm I to rotate, and the liquid collecting tank I is enabled to move up and down along the worm I;

the side wall of the bottom end of the measuring cylinder II is communicated to the bottom of the liquid collecting tank II through a rubber tube II, a solenoid valve VII is installed on the rubber tube II, an explosion-proof servo motor II is installed at the bottom end of the liquid collecting tank II, two ends of a worm II are fixed on an equipment shell through bearings, and the explosion-proof servo motor II drives a worm wheel to drive the worm II to rotate so that the liquid collecting tank II moves up and down along the worm II;

the temperature sensor, the gas pressure sensor I, the gas pressure sensor II, the intelligent flowmeter, the methane concentration sensor, the liquid pressure sensor I and the liquid pressure sensor II respectively transmit detected signals to an input port of the central multifunctional processing display through lines, and an output port of the central multifunctional processing display is connected to the PLC through a line;

the PLC controls the opening and closing of the electromagnetic valve I, the electromagnetic valve II, the electromagnetic valve III, the electromagnetic valve IV, the electromagnetic valve V, the electromagnetic valve VI, the electromagnetic valve VII and the explosion-proof vacuum pump by receiving an instruction of the central multifunctional processing display, and controls rotating speed signals of the explosion-proof high-speed motor, the explosion-proof servo motor I and the explosion-proof servo motor II.

in order to accelerate the rapid desorption of the gas, the invention selects to install the electromagnetic heating ring on the side surface of the coal sample tank.

In order to ensure the sealing performance of the system, reduce the influence of other factors on the device and improve the data performance and accuracy of experimental data, the shaft part of the combined blade is connected to the top end of the coal sample tank through a mechanical sealing element.

the intelligent flow meter has two gears, is gear I respectively: range 0-500 ml/min, gear II: the measuring range is 0-1000 ml/min, and the flow can be automatically switched according to the actual measured flow, so that the measuring result is more accurate;

The coal sample tank can be filled with at least 1000g of pulverized coal and has the pressure resistance higher than 5 Mpa.

the measuring ranges of the liquid pressure sensor I and the liquid pressure sensor II are 0.1-1 MPa, and the precision is 0.001 MPa; the measurement ranges of the gas pressure sensor I and the gas pressure sensor II are 0.1-1 MPa, and the precision is 0.001 MPa; the measurement range of the temperature sensor is 0-95 ℃, and the precision is 0.05 ℃; the range of the methane concentration sensor is 0-100.00% CH4, and the accuracy is 1.00% CH 4.

The rotating speeds of the explosion-proof servo motor I and the explosion-proof servo motor II are both lower than 3000 r/min; the rotating speed of the explosion-proof high-speed motor is higher than 500 r/min; the volume of the measuring cylinder I and the volume of the measuring cylinder II are both less than or equal to 1500ml, and the volume of the liquid collection tank I and the volume of the liquid collection tank II are both less than or equal to 1500 ml.

An automatic measurement method for gas content of a coal seam under a coal mine comprises the following steps:

Filling a nontoxic, harmless, anticorrosive and colored liquid into a measuring cylinder I and a measuring cylinder II, starting a measuring device, supplying power to the whole device by an explosion-proof battery, clicking a sampling starting button on a central multifunctional processing display when drilling is started in a coal mine, removing gangue, mud and ground and burnt parts after coal scraps are taken out by drilling, weighing, quickly filling the coal sample into a coal sample tank and screwing down, clicking a sampling stopping button on the central multifunctional processing display, automatically recording the time t1 from the beginning of drilling to the filling of the coal sample into the coal sample tank by the central multifunctional processing display, and then inputting the weighed coal sample mass m in a prompt window;

secondly, sensing the ambient temperature T and the atmospheric pressure P in real time by a temperature sensor and a gas pressure sensor I, and respectively transmitting the ambient temperature T and the atmospheric pressure P to a central multifunctional processing display through lines;

thirdly, opening a needle valve, clicking a button for starting natural desorption and measurement on the central multifunctional processing display, filtering coal dust floating along with air flow by the desorbed gas in the coal sample tank through a gas-solid separator, sensing the concentration of the desorbed gas through a methane concentration sensor, and transmitting the result to the central multifunctional processing display;

when data of the methane concentration sensor is transmitted to the central multifunctional processing display, the PLC controls the solenoid valve I to be opened, the solenoid valves IV and III to be closed, the gas firstly passes through the intelligent flow meter, the result is transmitted to the central multifunctional processing display, the central multifunctional processing display judges the measuring state according to the gas flow and sends an instruction, and the fifth step is started;

When the gas flow is sensed to be 500-1000 ml/min, the intelligent flow meter adopts the measurement data of the gear II; when the gas flow is sensed to be between 100 and 500ml/min, the intelligent flowmeter adopts the measurement data of a gear I and transmits the data to a central multifunctional processing display, wherein the measurement data of a gear II is adopted when the measurement value is 500 ml/min;

when the gas flow is sensed to be 0-100 ml/min, the PLC controls the solenoid valve I, the solenoid valve IV, the solenoid valve II and the solenoid valve V to be closed, the solenoid valve III and the solenoid valve VI are opened, the gas enters the measuring cylinder I through the pipeline, the gas pressure sensor II communicated with the pipeline senses the pressure of desorbed gas in real time and transmits data to the central multifunctional processing display, the liquid pressure sensor I measures and calculates the amount of desorbed gas by sensing the hydraulic pressure change caused by the liquid level change in the measuring cylinder I, and the measured and calculated value is transmitted to the central multifunctional processing display; in the process, gas enters a measuring cylinder I, liquid in the measuring cylinder I is discharged into a liquid collection tank I through a rubber tube I, at the moment, a central multifunctional processing display controls the operation of an explosion-proof servo motor I through a PLC (programmable logic controller) according to the measurement data of a gas pressure sensor II to drive a turbine to rotate a worm I, so that the liquid collection tank I moves up and down along the worm I, the gas pressure detected by the gas pressure sensor II is always the atmospheric pressure, the liquid level in the liquid collection tank I and the liquid level in the measuring cylinder I are kept parallel, and the pressure generated by hydraulic pressure difference is eliminated;

When the liquid amount in the measuring cylinder I is less than 1/6 of the height of the measuring cylinder I, the PLC controls the solenoid valve I, the solenoid valve III and the solenoid valve V to be closed, the solenoid valve IV, the solenoid valve II and the solenoid valve VII to be opened, gas in a pipeline enters the measuring cylinder II, a gas pressure sensor II communicated with the pipeline senses the pressure of desorbed gas in real time and transmits data to the central multifunctional processing display, and the liquid pressure sensor II measures and calculates the amount of desorbed gas by sensing hydraulic pressure change caused by liquid level change in the measuring cylinder II and transmits a measured value to the central multifunctional processing display; in the process, gas enters a measuring cylinder II, liquid in the measuring cylinder II is discharged into a liquid collection tank II through a rubber tube II, at the moment, the central multifunctional processing display controls the operation of an explosion-proof servo motor II through a PLC (programmable logic controller) according to the measurement data of a gas pressure sensor II to drive a turbine to rotate a worm II, so that the liquid collection tank II moves up and down along the worm II, the gas pressure detected by the gas pressure sensor II 39 is always the atmospheric pressure, the liquid level in the liquid collection tank II and the measuring cylinder II is kept parallel, and the pressure generated by hydraulic pressure difference is eliminated;

Meanwhile, the PLC controller controls the explosion-proof vacuum pump to be started, gas in the measuring cylinder I is pumped out completely, and liquid in the liquid collecting tank I is sucked back to the measuring cylinder I; similarly, when the liquid amount in the equivalent cylinder II is less than 1/6 of the height of the measuring cylinder II, the PLC controls the electromagnetic valve I, the electromagnetic valve IV and the electromagnetic valve II to be closed, the electromagnetic valve III, the electromagnetic valve V, the electromagnetic valve VI and the explosion-proof vacuum pump to be opened, the gas passage is switched to be measured by the measuring cylinder I, the liquid is filled again by pumping the gas in the measuring cylinder II, and the operation is repeated in a circulating manner;

Recording the volume of desorbed gas every 30s in the process of measuring the amount of gas desorbed underground, and when continuously recording for 60min or the desorbed amount is less than 2ml/min, automatically stopping the measurement of the amount of gas desorbed naturally underground by the system, and simultaneously automatically recording the measurement time t2 of the amount of gas desorbed naturally underground and the amount of gas desorbed naturally underground V2;

After the underground natural desorption gas volume is measured, the central multifunctional processing display controls the explosion-proof high-speed motor to drive the combined blade to break the coal sample through the PLC according to a preset coal sample breaking program, simultaneously the electromagnetic heating ring is electrified to heat the coal sample in the coal sample tank to accelerate desorption, and the desorbed gas volume is automatically measured and recorded according to the steps of (c), (d), (c) and (c); after continuous smashing for 10min, the system automatically stops the smashing program, then continues to measure for 30min, namely the determination of the residual gas content is completed, and the desorption amount of the smashed gas is recorded as V3;

After the gas desorption amount of each stage at the red (R) is measured, the system rapidly calculates the lost gas amount V1 by utilizing a preset gas desorption dynamics fitting model according to the recorded coal sample desorption data, and automatically performs gas volume correction and calculation of the desorbed gas concentration on the gas desorption amount of each stage, thereby obtaining the coal bed gas content;

after the measuring and calculating processes are finished, the explosion-proof vacuum pump sucks all liquid into the measuring cylinder I and the measuring cylinder II, and meanwhile, the electromagnetic valve VI, the electromagnetic valve VII, the electromagnetic valve IV, the electromagnetic valve V, the electromagnetic valve II and the electromagnetic valve III are all closed, so that the liquid in the measuring cylinder I and the measuring cylinder II cannot overflow in the carrying process; meanwhile, the needle valve is closed to prevent sundries from entering the pipeline system;

And taking out the coal sample, cleaning the instrument and automatically issuing a measurement report.

The gas desorption dynamics fitting model is as follows:

Wherein: vt is the total amount of gas desorbed over time t;

v ∞ is the total amount of gas desorbed over an infinite time;

phi is a constant;

r0 is the coal particle radius;

Df is the diffusion coefficient;

Lambda and beta are fractional order parameters;

t is the desorption time.

In order to conveniently observe the liquid level height, the liquid in the step I is a mixture liquid of potassium permanganate and water, and the ratio of the potassium permanganate to the water is 1: 100.

Compared with the prior art, the method utilizes the central multifunctional processing display to display various parameters detected by the intelligent flowmeter, the methane concentration sensor, the liquid pressure sensor I and the liquid pressure sensor II, displays the parameters in real time on the interface of the central multifunctional processing display, and estimates the loss gas quantity according to a preset built-in fitting model by sensing the measurement data of the liquid pressure sensor I, the liquid pressure sensor II, the gas pressure sensor I, the gas pressure sensor II, the temperature sensor, the methane concentration sensor and the intelligent flowmeter through the opening and closing and starting and stopping of the electromagnetic valve I, the electromagnetic valve II, the electromagnetic valve III, the electromagnetic valve IV, the electromagnetic valve V, the explosion-proof servo motor I, the explosion-proof servo motor II and the explosion-proof high-speed motor in the PLC control system; then, on the premise of not opening the coal sample tank, breaking the coal sample through a PLC control program, and reducing gas loss caused by a measurement program; and finally, automatically correcting the gas content of each stage by the system, calculating the final coal bed gas content, and issuing a report. Meanwhile, the device and the method have the advantages of high measurement precision, high speed and high intelligent degree, the process of measuring the coal sample in an aboveground laboratory is omitted, the gas content can be measured in a one-stop manner in the well, the operation is simple, the data is reliable, the efficiency of measuring the gas content in the coal seam in the coal mine can be greatly improved, and the manual workload is reduced; the intelligent flowmeter and the intelligent gas and liquid discharging device which is composed of the explosion-proof vacuum pump, the measuring cylinder I, the measuring cylinder II, the liquid pressure sensor I, the liquid pressure sensor II, the liquid collecting tank I, the explosion-proof servo motor I, the liquid collecting tank II and the explosion-proof servo motor II are combined to make up the defects that the existing system cannot measure the large flow and the small flow accurately, and the gas desorption amount of each time period can be measured in a full range.

drawings

fig. 1 is a schematic diagram of the working principle of the present invention.

in the figure: 1. temperature sensor, 2, gas pressure sensor, 3, central multifunctional processing display, 4, PLC controller, 5, solenoid valves I, 6, intelligent flowmeter, 7, three-way joints I, 8, explosion-proof battery, 9, methane concentration sensor, 10, gas-solid separator, 11, combined blade, 12, coal sample tank, 13, needle valve, 14, explosion-proof vacuum pump, 15, worm I, 16, measuring cylinder I, 17, solenoid valves II, 18, three-way joints II, 19, three-way joints III, 20, solenoid valves III, 21, liquid collecting tank I, 22, explosion-proof servo motor I, 23, rubber tube I, 24, liquid pressure sensor I, 25, liquid pressure sensor II, 26, rubber tube II, 27, explosion-proof servo motor II, 28, liquid collecting tank II, 29, measuring cylinder II, 30, worm II, 31, solenoid valve IV, 32, solenoid valve V, 33, three-way joint IV, 34, 8, 9, 3, 4, gas-solid separator, combined, Three-way joints V and 35, electromagnetic valves VI and 36, electromagnetic valves VII and 37, an explosion-proof high-speed motor 38, electromagnetic heating rings 39, gas pressure sensors II and 40 and a three-way joint VI.

Detailed Description

The invention will be further explained with reference to the drawings.

as shown in figure 1, the automatic measuring device for the gas content of the coal seam of the coal mine comprises a coal sample tank 12 and a combined blade 11 arranged in the coal sample tank 12, wherein the combined blade 11 is driven by an anti-explosion high-speed motor 37 arranged on the coal sample tank 12, and further comprises a temperature sensor 1 for sensing the ambient temperature and a gas pressure sensor 2 for sensing the atmospheric pressure; the upper end of the coal sample tank 12 is connected with one end of a needle valve 13 through a pipeline, a gas-solid separator 10 is arranged on the pipeline connected with the other end of the needle valve 13 in sequence, the back of the methane concentration sensor 9 is connected with an inlet of a three-way joint I7, a first outlet of the three-way joint I7 is connected to an intelligent flowmeter 6 through an electromagnetic valve I5, a second outlet of the three-way joint I7 is connected with an inlet of a three-way joint VI 40, a first outlet of the three-way joint VI 40 is connected with a gas pressure sensor II 39, a second outlet of the three-way joint VI 40 is connected with an inlet of a three-way joint V34, a second outlet of the three-way joint I7 is connected with an inlet of the three-way joint V34, a first outlet of the three-way joint V34 is connected to an inlet of a three-way joint III 19 through an electromagnetic valve III 20, a first outlet of the three-way joint III 19 is connected with an inlet at the top end of a measuring cylinder I16, and a second outlet of; a second outlet of the three-way joint V34 is connected to an inlet of a three-way joint IV 33 through an electromagnetic valve IV 31, a first outlet of the three-way joint IV 33 is connected with an inlet at the top end of the measuring cylinder II 29, and a second outlet of the three-way joint IV 33 is connected to a second inlet of a three-way joint II 18 through an electromagnetic valve V32; the outlet of the three-way joint II 18 is connected with an explosion-proof vacuum pump 14; the bottom ends of the inner parts of the measuring cylinder I16 and the measuring cylinder II 29 are respectively provided with a liquid pressure sensor I24 and a liquid pressure sensor II 25;

the side wall of the bottom end of the measuring cylinder I16 is communicated to the bottom of the liquid collecting tank I21 through a rubber tube I23, an electromagnetic valve VI 35 is installed on the rubber tube I23, an explosion-proof servo motor I22 is installed at the bottom end of the liquid collecting tank I21, two ends of a worm I15 are fixed on an equipment shell through bearings, the explosion-proof servo motor I22 drives a worm wheel to drive the worm I15 to rotate, and the liquid collecting tank I21 moves up and down along the worm I15;

The side wall of the bottom end of the measuring cylinder II 29 is communicated to the bottom of the liquid collecting tank II 28 through a rubber tube II 26, an electromagnetic valve VII 36 is installed on the rubber tube II 26, an explosion-proof servo motor II 27 is installed at the bottom end of the liquid collecting tank II 28, two ends of a worm II 30 are fixed on an equipment shell through bearings, the explosion-proof servo motor II 27 drives a worm wheel to drive the worm II 30 to rotate, and the liquid collecting tank II 28 moves up and down along the worm II 30;

the temperature sensor 1, the gas pressure sensor I2, the gas pressure sensor II 39, the intelligent flowmeter 6, the methane concentration sensor 9, the liquid pressure sensor I24 and the liquid pressure sensor II 25 respectively transmit detected signals to an input port of the central multifunctional processing display 3 through lines, and an output port of the central multifunctional processing display 3 is connected to the PLC 4 through a line;

the PLC 4 receives the instruction of the central multifunctional processing display 3 to control the opening and closing of the electromagnetic valve I5, the electromagnetic valve II 17, the electromagnetic valve III 20, the electromagnetic valve IV 31, the electromagnetic valve V32, the electromagnetic valve VI 35, the electromagnetic valve VII 36 and the explosion-proof vacuum pump 14 and control the rotating speed signals of the explosion-proof high-speed motor 37, the explosion-proof servo motor I22 and the explosion-proof servo motor II 27.

an electromagnetic heating ring 38 is mounted on the side surface of the coal sample tank 12.

The shaft portion of the composite blade 11 is connected to the top end of the coal sample tank 12 through a mechanical seal.

the intelligent flow meter 6 has two gears, which are gear I: range 0-500 ml/min, gear II: the measuring range is 0-1000 ml/min.

The coal sample tank 12 can contain not less than 1000g of pulverized coal and the pressure resistance is not less than 5 Mpa.

The measuring ranges of the liquid pressure sensor I24 and the liquid pressure sensor II 25 are 0.1-1 MPa, and the precision is 0.001 MPa; the liquid pressure sensor I24 and the liquid pressure sensor II 25 can respectively detect the hydraulic pressure change caused by the liquid level change of the measuring cylinder I16 and the measuring cylinder II 29 to measure and calculate the volume of gas respectively entering the measuring cylinder I16 and the measuring cylinder II 29; the volumes of the measuring cylinder I16 and the measuring cylinder II 29 are less than or equal to 1500ml, the volumes of the liquid collection tank I21 and the liquid collection tank II 28 are less than or equal to 1500ml, and the volumes of the liquid collection tank I21 and the liquid collection tank II 28 are not more than 1500 ml; the data are transmitted to the central multifunctional processing display 3, so that the step of manual reading is omitted, and the data accuracy and the metering efficiency are improved;

the measurement ranges of the gas pressure sensor I2 and the gas pressure sensor II 39 are 0.1-1 MPa, and the precision is 0.001 MPa; the measurement range of the temperature sensor 1 is 0-95 ℃, and the precision is 0.05 ℃; the range of the methane concentration sensor 9 is 0-100.00% CH4, and the accuracy is 1.00% CH 4.

the rotating speeds of the explosion-proof servo motor I22 and the explosion-proof servo motor II 27 are both lower than 3000 r/min; the rotating speed of the explosion-proof high-speed motor 37 is higher than 500r/min, the combined blade 11 is driven by the explosion-proof high-speed motor 37, the explosion-proof high-speed motor 37 is controlled by the PLC 4 through the line, the coal sample in the coal sample tank 12 can be smashed at high speed, the step of breaking the coal sample in a ground laboratory is omitted, the gas content can be determined in a one-stop mode in a well, the operation is simple, the data is reliable, the efficiency of determining the gas content in a coal mine underground coal seam can be greatly improved, and the manual workload is reduced.

an automatic measurement method for gas content of a coal seam under a coal mine comprises the following steps:

Filling a proportioning liquid of potassium permanganate and water with a ratio of 1:100 into a measuring cylinder I16 and a measuring cylinder II 29, starting a measuring device, supplying power to the whole device by an explosion-proof battery 8, clicking a sampling starting button on a central multifunctional processing display 3 when drilling is started in a coal mine, removing gangue, mud stone and ground coke-burning parts after coal scraps are taken out by drilling, weighing, quickly loading the coal scraps into a coal sample tank 12 and screwing down, clicking a sampling stopping button on the central multifunctional processing display 3, automatically recording the time t1 from the beginning of drilling to the loading of the coal sample into the coal sample tank 12 by the central multifunctional processing display 3, and then inputting the weighed coal sample mass m in a prompt window;

secondly, sensing the ambient temperature T and the atmospheric pressure P in real time by a temperature sensor 1 and a gas pressure sensor I2, and respectively transmitting the ambient temperature T and the atmospheric pressure P to a central multifunctional processing display 3 through lines;

thirdly, opening a needle valve 13, clicking a button for starting natural desorption and measurement on the central multifunctional processing display 3, filtering coal dust floating along with air flow by passing the desorbed gas in the coal sample tank 12 through a gas-solid separator 10, sensing the concentration of the desorbed gas through a methane concentration sensor 9, and transmitting the result to the central multifunctional processing display 3;

when data of the methane concentration sensor 9 is transmitted to the central multifunctional processing display 3, the PLC 4 controls the solenoid valve I5 to be opened, the solenoid valve IV 31 and the solenoid valve III 20 to be closed, the gas firstly passes through the intelligent flowmeter 6, the result is transmitted to the central multifunctional processing display 3, the central multifunctional processing display 3 judges the determination state according to the gas flow, and sends an instruction, and the fifth step is started;

when the gas flow is sensed to be 500-1000 ml/min, the intelligent flowmeter 6 adopts the measurement data of the gear II; when the gas flow is sensed to be between 100 and 500ml/min, the intelligent flowmeter 6 adopts the measurement data of a gear I and transmits the data to the central multifunctional processing display 3, wherein the measurement data of a gear II is adopted when the measurement value is 500 ml/min;

Sixthly, when the gas flow is sensed to be 0-100 ml/min, the PLC 4 controls the electromagnetic valve I5, the electromagnetic valve IV 31, the electromagnetic valve II 17 and the electromagnetic valve V32 to be closed, the electromagnetic valve III 20 and the electromagnetic valve VI 35 to be opened, the gas enters the measuring cylinder I16 through the pipeline, the gas pressure sensor II 39 communicated with the pipeline senses the pressure of desorbed gas in real time and transmits data to the central multifunctional processing display 3, the liquid pressure sensor I24 measures and calculates the amount of desorbed gas by sensing the hydraulic pressure change caused by the liquid level change in the measuring cylinder I16 and transmits a measured value to the central multifunctional processing display 3, in the process, the gas enters the measuring cylinder I16, the liquid in the measuring cylinder I16 is discharged into the liquid collecting tank I21 through the rubber pipe I23, and the central multifunctional processing display 3 transmits the measured value to the central multifunctional processing display 3 according to the measured data of the gas pressure sensor II 39, the PLC 4 is used for controlling the operation of the explosion-proof servo motor I22 to drive the turbine to enable the worm I15 to rotate, so that the liquid collection tank I21 moves up and down along the worm I15, the gas pressure detected by the gas pressure sensor II 39 is guaranteed to be atmospheric pressure all the time, namely, the liquid level in the liquid collection tank I21 and the liquid level in the measuring cylinder I16 are kept parallel, and the pressure generated by the liquid pressure difference between the liquid collection tank I21 and the liquid level in the measuring cylinder I16 is eliminated;

when the liquid amount in the measuring cylinder I16 is less than 1/6 of the height of the measuring cylinder I16, the PLC 4 controls the solenoid valve I5, the solenoid valve III 20 and the solenoid valve V32 to be closed, the solenoid valve IV 31, the solenoid valve II 17 and the solenoid valve VII 36 to be opened, gas in a pipeline enters the measuring cylinder II 29, a gas pressure sensor II 39 communicated with the pipeline senses the pressure of desorbed gas in real time and transmits data to the central multifunctional processing display 3, and a liquid pressure sensor II 25 measures and calculates the desorbed gas amount by sensing hydraulic pressure change caused by liquid level change in the measuring cylinder II 29 and transmits a measured and calculated value to the central multifunctional processing display 3; in the process, gas enters a measuring cylinder II 29, liquid in the measuring cylinder II 29 is discharged into a liquid collection tank II 28 through a rubber tube II 26, at the moment, the central multifunctional processing display 3 drives a turbine to rotate a worm II 30 by controlling the operation of an explosion-proof servo motor II 27 through a PLC (programmable logic controller) 4 according to the measurement data of a gas pressure sensor II 39, so that the liquid collection tank II 28 moves up and down along the worm II 30, the gas pressure detected by the gas pressure sensor II 39 is ensured to be atmospheric pressure all the time, namely, the liquid level in the liquid collection tank II 28 and the liquid level in the measuring cylinder II 29 are kept parallel, and the pressure generated by the gas pressure sensor II and the liquid level in the measuring cylinder II 29 due to hydraulic pressure difference;

Meanwhile, the PLC 4 controls the explosion-proof vacuum pump 14 to be started, gas in the measuring cylinder I16 is pumped out, and liquid in the liquid collecting tank I21 is sucked back to the measuring cylinder I16; similarly, when the liquid amount in the equivalent cylinder II 29 is less than 1/6 of the height of the measuring cylinder II 29, the PLC 4 controls the electromagnetic valve I5, the electromagnetic valve IV 31 and the electromagnetic valve II 17 to be closed, the electromagnetic valve III 20, the electromagnetic valve V32, the electromagnetic valve VI 35 and the explosion-proof vacuum pump 14 to be opened, the gas passage is switched to be measured by the measuring cylinder I16, the liquid is replenished by pumping the gas in the measuring cylinder II 29, and the circulation is repeated in such a way, so that the liquid can be recycled, and the device can also work normally in a liquid-free place under a coal mine;

recording the volume of desorbed gas every 30s in the process of measuring the amount of gas desorbed underground, and when continuously recording for 60min or the desorbed amount is less than 2ml/min, automatically stopping the measurement of the amount of gas desorbed naturally underground by the system, and simultaneously automatically recording the measurement time t2 of the amount of gas desorbed naturally underground and the amount of gas desorbed naturally underground V2;

ninthly, after the underground natural desorption gas volume is measured, the central multifunctional processing display 3 controls the explosion-proof high-speed motor 37 to drive the combined blade 11 to break the coal sample through the PLC 4 according to a preset coal sample breaking program, simultaneously the electromagnetic heating ring is electrified to heat the coal sample in the coal sample tank 12, desorption is accelerated, and the desorbed gas volume is automatically metered and recorded according to the steps of (c), (d), (c) and (c); after continuous smashing for 10min, the system automatically stops the smashing program, then continues to measure for 30min, namely the determination of the residual gas content is completed, and the desorption amount of the smashed gas is recorded as V3;

After the gas desorption amount of each stage at the red (R) is measured, the system rapidly calculates the lost gas amount V1 by utilizing a preset gas desorption dynamics fitting model according to the recorded coal sample desorption data, and automatically performs gas volume correction and calculation of the desorbed gas concentration on the gas desorption amount of each stage, thereby obtaining the coal bed gas content;

after the measuring and calculating process is finished, the explosion-proof vacuum pump 14 sucks all liquid into the measuring cylinder I16 and the measuring cylinder II 29, and meanwhile, the electromagnetic valve VI 35, the electromagnetic valve VII 36, the electromagnetic valve IV 31, the electromagnetic valve V32, the electromagnetic valve II 17 and the electromagnetic valve III 20 are all closed, so that the liquid in the measuring cylinder I16 and the measuring cylinder II 29 cannot overflow in the carrying process; meanwhile, the needle valve 13 is closed to prevent sundries from entering the pipeline system;

And taking out the coal sample, cleaning the instrument and automatically issuing a measurement report.

The gas desorption dynamics fitting model is as follows:

wherein: vt is the total amount of gas desorbed over time t;

v ∞ is the total amount of gas desorbed over an infinite time;

phi is a constant;

r0 is the coal particle radius;

df is the diffusion coefficient;

lambda and beta are fractional order parameters;

t is the desorption time.