阅读说明：本技术 一种防尿素水解供氨管路堵塞系统 (Prevent that urea hydrolyzes and supplies ammonia pipeline to block up system ) 是由 孙洪坤 陈岩 段刚 朱玉朋 于 2021-05-28 设计创作，主要内容包括：本发明公开了一种防尿素水解供氨管路堵塞系统,其结构包括供氨管路、伴热管路、供氨总门、流量计、主路调节门旁路门、调节门前手动门、调节门、调节门后手动门、气动门、喷嘴前三通门、备用氨管路、稀释风管路、氨空混合器、伴热疏水一次门、伴热疏水二次门、主路喷氨格栅喷嘴,所述供氨管路最先连接供氨总门,所述流量计安装在供氨总门后的供氨管路上,之后的供氨管路分为两路,一路安装主路调节门旁路门,另一路先安装调节门前手动门,本发明能够在供氨主管路发生堵塞时,保证锅炉的正常运行,环保排放达标,本发明的附加旁路系统管路简单,耗材少,且方便施工,在运行时也方便投入。(The invention discloses a system for preventing blockage of urea hydrolysis ammonia supply pipelines, which structurally comprises an ammonia supply pipeline, a heat tracing pipeline, an ammonia supply main door, a flow meter, a main adjusting door bypass door, an adjusting door front manual door, an adjusting door rear manual door, a pneumatic door, a nozzle front three-way door, a standby ammonia pipeline, a dilution air pipeline, an ammonia air mixer, a heat tracing and water draining primary door, a heat tracing and water draining secondary door and a main ammonia spraying grid nozzle, wherein the ammonia supply pipeline is firstly connected with the ammonia supply main door, the flow meter is arranged on the ammonia supply pipeline behind the ammonia supply main door, the subsequent ammonia supply pipeline is divided into two paths, one path is provided with the main adjusting door bypass door, the other path is provided with the adjusting door front manual door, the system can ensure normal operation of a boiler when the ammonia supply main pipeline is blocked, environmental-friendly emission reaches the standard, the pipeline of the additional bypass system is simple, few in amount and convenient in construction, the investment is convenient during the operation.)

1. The utility model provides a prevent that urea hydrolyzes and supplies ammonia pipeline to block up system which characterized in that: the ammonia-water-assisted ammonia-water boiler structurally comprises an ammonia supply pipeline (1), a heat tracing pipeline (2), an ammonia supply main door (3), a flow meter (4), a main pipeline adjusting door bypass door (5), an adjusting door front manual door (6), an adjusting door (7), an adjusting door rear manual door (8), a pneumatic door (9), a nozzle front three-way door (10), a standby ammonia pipeline (11), a dilution air pipeline (12), an ammonia-water mixer (13), a heat tracing and water draining primary door (14), a heat tracing and water draining secondary door (15), a main pipeline ammonia-spraying grid nozzle (16), an ammonia supply main door front connection bypass control door (17), a flow meter purging door (18), an ammonia supply main door bypass purging door (19), an adjusting door purging door (20), an ammonia supply adjusting door rear connection bypass control door (21), a heat tracing and steam purging main door (22), a soot blowing steam door (23), a jet ejector purging door (24), a jet ejector (25), Bypass ammonia supply grid nozzle (26), flue (27), supply ammonia and prevent stifled bypass (28), furnace soot blowing steam inlet pipe (29), supply ammonia pipeline (1) to connect at first and supply ammonia main gate (3), flowmeter (4) are installed on supplying ammonia pipeline (1) behind supplying ammonia main gate (3), supply ammonia pipeline (1) afterwards divide into two the tunnel, install main road regulation gate bypass gate (5) all the way, another installs manual door (6) before the regulation gate earlier, regulation gate (7) are installed on supplying ammonia pipeline (1) behind manual door (6) before the regulation gate, manual door (8) are on supplying ammonia pipeline (1) behind regulation gate (7) behind main road regulation gate bypass gate (5) and behind the regulation gate manual door (8) for two the tunnel converge together, pneumatic door (9) are installed on main road regulation gate bypass gate (5) after the regulation gate manual door (8) converge on ammonia pipeline (1) behind the convergence point behind manual door (8), the front three-way door (10) of the nozzle is arranged on the ammonia supply pipeline (1) behind the pneumatic door (9), the spare ammonia pipeline (11) is communicated to the front three-way door (10) of the nozzle, the ammonia-air mixer (13) is arranged on the ammonia supply pipeline (1) behind the three-way door (10) in front of the nozzle, the dilution air pipeline (12) is introduced into the ammonia air mixer (13) from the side surface of the ammonia air mixer (13), the ammonia supply pipeline (1) behind the ammonia-air mixer (13) enters a flue (27), the main ammonia spraying grid nozzle (16) is arranged at the tail end of an ammonia supply pipeline (1) in a flue (27), the heat tracing pipeline (2) and the ammonia supply pipeline (1) are arranged in parallel and closely until the front of the ammonia air mixer (13), the heat tracing hydrophobic primary door (14) is arranged on the heat tracing pipeline (2) away from the area which is arranged in parallel and adjacent to the ammonia supply pipeline (1).

2. The utility model provides a prevent that urea hydrolyzes and supplies ammonia pipeline to block up system which characterized in that: the heat tracing and water draining secondary door (15) is arranged on a heat tracing pipeline (2) behind the heat tracing and water draining primary door (14), the ammonia supply anti-blocking bypass (28) is led out in front of an ammonia supply main door (3) of the ammonia supply pipeline (1), the ammonia supply main door front guide bypass control door (17) is installed behind an ammonia supply anti-blocking bypass (28) leading out an ammonia supply pipeline point in front of the ammonia supply main door (3) of the ammonia supply pipeline (1), the ammonia supply anti-blocking bypass (28) behind the ammonia supply main door front guide bypass control door (17) directly enters an ejector (25), the hearth soot blowing steam inlet door (23) is installed at the foremost end of a hearth soot blowing steam inlet pipe (29), the hearth soot blowing steam inlet pipe (29) is divided into two hearth soot blowing steam inlet pipes (23) behind the hearth soot blowing steam inlet door (23), one divided hearth soot blowing steam inlet pipe (29) enters the ejector (25) from the front end of the ejector (25), and the ejector (24) is connected with the soot blowing steam inlet pipe (29) to blow the hearth to the two hearth soot blower doors (23) to blow two hearth soot blower pipes to enter the ejector (25) The rear part of the furnace is divided into two paths, soot blowing steam of a hearth (29) behind the ejector purging door (24) enters the ejector (25) from the side surface of the ejector (25), an ammonia supply anti-blocking bypass (28) led out from the ejector (25) enters a flue (27), an ammonia supply anti-blocking bypass (28) entering the flue (27) is led out, and an ammonia supply pipeline (1) is also led out behind the adjusting door (7) and the manual door (8) behind the adjusting door.

3. The utility model provides a prevent that urea hydrolyzes and supplies ammonia pipeline to block up system which characterized in that: the ammonia supply adjusting door rear connecting bypass control door (21) is arranged on an ammonia supply pipeline (1) behind a leading-out point between an adjusting door (7) and an adjusting door rear manual door (8), the ammonia supply pipeline (1) behind the ammonia supply adjusting door (21) is connected and led on the ammonia supply pipeline (1) between an ammonia supply main door front connecting bypass control door (17) and an ejector (25), the adjusting door rear manual door (8) leads out a heat tracing pipeline (2) between a heat tracing and drainage primary door (14) and a heat tracing and drainage secondary door (15), the heat tracing and steam purging main door (22) is connected and led on a heat tracing pipeline (2) behind a heat tracing and drainage primary door (14) and a heat tracing and drainage secondary door (15), the heat tracing pipeline (2) behind the heat tracing and steam purging main door (22) is divided into three paths, the flowmeter purging door (18) is connected and divided into a third heat tracing pipeline (2) behind the heat tracing and steam purging main door (22) leading out point, the ammonia supply main door bypass purging door (19) is connected with the heat tracing pipeline (2) behind the heat tracing steam purging main door (22) and is divided into a second three-way path, the adjusting door purging door (20) is connected with the heat tracing pipeline (2) behind the heat tracing steam purging main door (22) and is divided into a third three-way path, the heat tracing pipeline (2) behind the flowmeter purging door (18) is connected with the ammonia supply pipeline (1) between the ammonia supply main door (3) and the flowmeter (4), the heat tracing pipeline (2) behind the ammonia supply main door bypass purging door (19) is connected with the ammonia supply pipeline (1) between the bypass control door (17) and the ejector (25) in front of the ammonia supply main door, and the heat tracing pipeline (2) behind the adjusting door purging door (20) is connected with the adjusting door (7).

Technical Field

The invention relates to the field of ammonia supply pipeline blocking systems, in particular to a system for preventing urea hydrolysis ammonia supply pipeline blocking.

Background

Most thermal power plant's boilers provide the denitration ammonia for the boiler through the mode of urea of hydrolysising, have eliminated the ammonia transportation and have stored the safety risk of bringing, but urea denitration system of hydrolysising often takes place the pipeline and blocks up the problem, leads to discharging to exceed standard, has brought huge threat for unit environmental protection steady operation. The urea hydrolysis prevention ammonia supply pipeline blockage prevention system designed at this time can treat pipeline blockage of a denitration system under the condition that ammonia is normally supplied without stopping so as to ensure that the denitration efficiency of a unit is not less than 87.5 percent, and the concentration of a flue gas outlet is not higher than 50mg/m³The coal-fired power plant is safe and environment-friendly to operate under the condition of ultralow emission standard.

Disclosure of Invention

In order to solve the problems, the invention provides a system for preventing blockage of a urea hydrolysis ammonia supply pipeline.

In order to achieve the purpose, the invention is realized by the following technical scheme: a system for preventing urea hydrolysis ammonia supply pipeline from being blocked structurally comprises an ammonia supply pipeline, a heat tracing pipeline, an ammonia supply main door, a flow meter, a main adjusting door bypass door, an adjusting door front manual door, an adjusting door rear manual door, a pneumatic door, a nozzle front three-way door, a standby ammonia pipeline, a dilution air pipeline, an ammonia air mixer, a heat tracing and water draining primary door, a heat tracing and water draining secondary door, a main ammonia spraying grid nozzle, an ammonia supply main door front connection bypass control door, a flow meter purging door, an ammonia supply main door bypass purging door, an adjusting door purging door, an ammonia supply adjusting door rear connection bypass control door, a heat tracing and steam purging main door, a hearth soot blowing steam inlet door, an ejector purging door, a bypass ammonia supply grid nozzle, a flue, an ammonia supply anti-blocking bypass, a hearth soot blowing steam inlet pipe, the ammonia supply pipeline is firstly connected with the ammonia supply main door, the flow meter is installed on the ammonia supply pipeline behind the ammonia supply main door, the subsequent ammonia supply pipeline is divided into two paths, one path is provided with a main path adjusting door bypass door, the other path is provided with an adjusting door front manual door, the adjusting door is arranged on an ammonia supply pipeline behind the adjusting door front manual door, the adjusting door rear manual door is arranged on the ammonia supply pipeline behind the adjusting door, then the two paths are converged together behind the main path adjusting door bypass door and the adjusting door rear manual door, the pneumatic door is arranged on the ammonia supply pipeline behind the converging point of the adjusting door rear manual door behind the main path adjusting door bypass door, the nozzle front three-way door is arranged on the ammonia supply pipeline behind the pneumatic door, a standby ammonia pipeline is introduced on the nozzle front three-way door, the ammonia air mixer is arranged on the ammonia supply pipeline behind the nozzle front three-way door, the dilution air pipeline is introduced into the ammonia air mixer from the side surface of the ammonia flue, the ammonia supply pipeline behind the ammonia air mixer enters the flue, and the ammonia spraying grid nozzle is arranged at the tail end of the ammonia supply pipeline in the main path, the heat tracing pipeline and the ammonia supply pipeline are arranged in parallel and close to each other until the front of the ammonia-air mixer, and the heat tracing hydrophobic primary door is arranged on the heat tracing pipeline away from the area which is arranged in parallel and close to the ammonia supply pipeline.

Furthermore, the heat tracing drainage secondary door is arranged on a heat tracing pipeline behind the heat tracing drainage primary door, the ammonia supply anti-blocking bypass is led out in front of an ammonia supply main door of the ammonia supply pipeline, the ammonia supply main door front connection bypass control door is arranged behind a point of the ammonia supply bypass led out in front of the ammonia supply main door of the ammonia supply pipeline, the ammonia supply anti-blocking bypass behind the ammonia supply main door front connection bypass control door directly enters the ejector, the hearth soot blowing steam inlet door is arranged at the foremost end of a hearth soot blowing steam inlet pipe, the hearth soot blowing steam inlet pipe is divided into two paths behind the hearth soot blowing steam inlet door, one path of the divided hearth soot blowing steam inlet pipe enters the ejector from the front end of the ejector, the ejector blowing door is connected to the hearth soot blowing steam inlet pipe and divided into the other path behind the hearth soot blowing steam inlet door, and steam behind the ejector blowing steam blower enters the ejector from the side of the ejector, the ammonia supply anti-blocking bypass led out from the ejector enters the flue, enters the ammonia supply anti-blocking bypass of the flue, and is led out from the adjusting door and the manual door behind the adjusting door to form an ammonia supply pipeline.

Furthermore, the ammonia supply adjusting door rear connection bypass control door is arranged on an ammonia supply pipeline behind a leading-out point between the adjusting door and an adjusting door rear manual door, the ammonia supply pipeline behind the ammonia supply adjusting door is connected on an ammonia supply pipeline between a front connection bypass control door of the ammonia supply main door and the ejector, the adjusting door rear manual door leads out a heat tracing pipeline between a heat tracing and water draining primary door and a heat tracing and water draining secondary door, the heat tracing and steam purging main door is connected on a heat tracing pipeline behind the leading-out point between the heat tracing and water draining primary door and the heat tracing and water draining secondary door, the heat tracing pipeline behind the heat tracing and steam purging main door is divided into three paths, the flowmeter purging door is connected with a first path of the three paths of the heat tracing pipeline behind the heat tracing and steam purging main door, the ammonia supply main door bypass purging door is connected with a second path of the three paths of the heat tracing pipeline behind the heat tracing and steam purging main door, the adjusting door purging door is connected with a third path of a heat tracing pipeline which is divided into three paths after the heat tracing steam purging main door, the heat tracing pipeline behind the flow meter purging door is connected with an ammonia supply pipeline between the ammonia supply main door and the flow meter, the heat tracing pipeline behind the ammonia supply main door bypass purging door is connected with the ammonia supply pipeline between the bypass control door and the ejector in front of the ammonia supply main door, and the heat tracing pipeline behind the adjusting door purging door is connected with the adjusting door.

Compared with the prior art, the invention has the following beneficial effects:

1. the invention can ensure the normal operation of the boiler when the main ammonia supply pipeline is blocked, and the environmental-friendly emission reaches the standard.

2. The additional bypass system has simple pipeline, less material consumption, convenient construction and convenient investment in operation.

Drawings

FIG. 1 is a diagram of an ammonia supply pipeline anti-blocking system according to the present invention.

In the figure: ammonia supply pipeline-1, heat tracing pipeline-2, ammonia supply main gate-3, flowmeter-4, main adjusting gate by-pass gate-5, adjusting gate front hand gate-6, adjusting gate-7, adjusting gate back hand gate-8, pneumatic gate-9, nozzle front three-way gate-10, spare ammonia pipeline-11, dilution air pipeline-12, ammonia air mixer-13, heat tracing and water draining primary gate-14, heat tracing and water draining secondary gate-15, main ammonia spraying grid nozzle-16, ammonia supply main gate front lead-in by-pass control gate-17, flowmeter purge gate-18, ammonia supply main gate by-pass purge gate-19, adjusting gate purge gate-20, ammonia supply adjusting gate back lead-in by-pass control gate-21, heat tracing and steam supply purge gate-22, soot blowing and steam supply gate-23, Ejector purging gate-24, ejector-25, bypass ammonia supply grid nozzle-26, flue-27, ammonia supply anti-blocking bypass-28, hearth soot blowing steam inlet pipe-29.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are some, not all embodiments of the present invention, and all other embodiments obtained by those skilled in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Examples

As shown in figure 1, the invention provides a system for preventing blockage of a urea hydrolysis ammonia supply pipeline, which structurally comprises an ammonia supply pipeline 1, a heat tracing pipeline 2, an ammonia supply main door 3, a flow meter 4, a main pipeline adjusting door bypass door 5, an adjusting door front manual door 6, an adjusting door 7, an adjusting door rear manual door 8, a pneumatic door 9, a nozzle front three-way door 10, a standby ammonia pipeline 11, a dilution air pipeline 12, an ammonia air mixer 13, a heat tracing hydrophobic primary door 14, a heat tracing hydrophobic secondary door 15, a main pipeline ammonia spraying grid nozzle 16, an ammonia supply main door front connection bypass control door 17, a flow meter purging door 18, an ammonia supply main door bypass purging door 19, an adjusting door purging door 20, an ammonia supply adjusting door rear connection bypass control door 21, a hearth steam tracing purging main door 22, a soot blowing purging steam door 23, a jet ejector door 24, a jet ejector 25, a bypass ammonia supply grid nozzle 26, a bypass 27, an ammonia supply bypass anti-blocking 28, A furnace chamber soot blowing steam inlet pipe 29, wherein the ammonia supply pipeline 1 is firstly connected with an ammonia supply main door 3, the flowmeter 4 is installed on the ammonia supply pipeline 1 behind the ammonia supply main door 3, the ammonia supply pipeline 1 behind the ammonia supply main door 3 is divided into two paths, one path is provided with a main path adjusting door bypass door 5, the other path is provided with an adjusting door front manual door 6, the adjusting door 7 is installed on the ammonia supply pipeline 1 behind the adjusting door front manual door 6, the adjusting door rear manual door 8 is arranged on the ammonia supply pipeline 1 behind the adjusting door 7, then the two paths are combined together after the main path adjusting door bypass door 5 and the adjusting door rear manual door 8, the pneumatic door 9 is installed on the ammonia supply pipeline 1 behind the main path adjusting door bypass door 5 and the adjusting door rear manual door 8, the nozzle front three-way door 10 is installed on the ammonia supply pipeline 1 behind the pneumatic door 9, a standby ammonia pipeline 11 is introduced on the nozzle front three-way door 10, and the ammonia air combiner 13 is installed on the ammonia supply pipeline 1 behind the nozzle three-way door 10, the dilution air pipeline 12 is introduced into the ammonia air mixer 13 from the side of the ammonia air mixer 13, the ammonia supply pipeline 1 behind the ammonia air mixer 13 enters a flue 27, the main-path ammonia spraying grid nozzle 16 is installed at the tail end of the ammonia supply pipeline 1 in the flue 27, the heat tracing pipeline 2 and the ammonia supply pipeline 1 are arranged in parallel and closely until the front of the ammonia air mixer 13, the heat tracing hydrophobic primary secondary door 14 is arranged on the heat tracing pipeline 2 away from the area which is arranged in parallel and closely with the ammonia supply pipeline 1, the heat tracing hydrophobic secondary door 15 is arranged on the heat tracing pipeline 2 behind the heat tracing hydrophobic primary door 14, the ammonia supply anti-blocking bypass 28 is led out in front of the ammonia supply main door 3 of the ammonia supply pipeline 1, the ammonia supply main door front connection bypass anti-blocking control door 17 is installed behind the ammonia supply bypass 28 led out of the ammonia supply pipeline point in front of the ammonia supply main door 3 of the ammonia supply pipeline 1, the ammonia supply bypass anti-blocking bypass 28 behind the ammonia supply main door front connection bypass anti-blocking control door 17 directly enters the ammonia supply anti-blocking device 25, the hearth soot blowing inlet valve 23 is arranged at the foremost end of a hearth soot blowing inlet pipe 29, the hearth soot blowing inlet pipe 29 is divided into two paths after the hearth soot blowing inlet valve 23, the divided one path of hearth soot blowing inlet pipe 29 enters the ejector 25 from the front end of the ejector 25, the ejector purging valve 24 is connected to the other path of the hearth soot blowing inlet pipe 29 divided into two paths after the hearth soot blowing inlet valve 23, the 29 hearth soot blowing inlet steam behind the ejector purging valve 24 enters the ejector 25 from the side surface of the ejector 25, the ammonia supply anti-blocking bypass 28 led out from the ejector 25 enters the flue 27 and enters the ammonia supply anti-blocking bypass 28 of the flue 27, the ammonia supply pipeline 1 is led out from the adjusting valve 7 and the manual valve 8 behind the adjusting valve, the ammonia supply adjusting valve rear connecting bypass control valve 21 is arranged on the ammonia supply pipeline 1 led out between the adjusting valve 7 and the manual valve 8 behind the adjusting valve, and the ammonia supply pipeline 1 led out from the ammonia supply adjusting valve behind the ammonia supply adjusting valve is connected to the ammonia supply main valve 17 and the ammonia supply bypass control valve 17 The ammonia supply pipeline 1 between the flow device 25, the manual door 8 behind the adjusting door leads out one heat tracing pipeline 2 between the heat tracing hydrophobic primary door 14 and the heat tracing hydrophobic secondary door 15, the heat tracing incoming steam purging main door 22 is connected to the heat tracing pipeline 2 behind the leading-out point between the heat tracing hydrophobic primary door 14 and the heat tracing hydrophobic secondary door 15, the heat tracing pipeline 2 behind the heat tracing incoming steam purging main door 22 is divided into three paths, the flowmeter purging door 18 is connected to the first of the three paths of the heat tracing pipeline 2 behind the heat tracing steam purging main door 22, the ammonia supply main door bypass purging door 19 is connected to the second of the three paths of the heat tracing pipeline 2 behind the heat tracing steam purging main door 22, the adjusting door purging door 20 is connected to the third of the three paths of the heat tracing pipeline 2 behind the heat tracing steam purging main door 22, the flowmeter 2 behind the purging door 18 is connected to the ammonia supply pipeline 1 between the ammonia supply main door 3 and the flowmeter 4, supply the main door bypass of ammonia to sweep the heat tracing pipeline 2 behind the door 19 and connect and draw before supplying the main door of ammonia and connect the confession ammonia pipeline 1 between bypass control gate 17 and the ejector 25, adjust the heat tracing pipeline 2 behind the door sweep door 20 and connect and draw on adjusting the door 7, install a bypass additional on the main ammonia pipeline 2 that supplies, the bypass setting is in the front of supplying the ammonia pipeline to adjust the door, has a bypass to supply the ammonia valve on the bypass, supply ammonia pipeline 1 and steam pipe to converge at flow accelerator, and flow accelerator export is installed the empty piece that mixes of ammonia, can accelerate steam and ammonia and mix. The working principle of the present invention is explained as follows: according to the invention, ammonia gas enters the system through the ammonia supply pipeline 1, and then enters the ammonia air mixer 13 and is mixed with dilution air from the dilution air pipeline 12 after sequentially passing through the heat tracing pipeline 2, the ammonia supply main door 3, the manual door 6 in front of the adjustment door, the adjustment door 7, the manual door 8 behind the adjustment door and the pneumatic door 9, and mixed ammonia air mixed gas enters the hearth through the ammonia supply pipeline 1 and then enters the flue 27 after being uniformly distributed through the main-path ammonia spraying grid nozzle 16, so that the denitration effect is achieved. The ammonia supply main gate 3 controls the ammonia supply of the whole main system, the flow meter 4 monitors the ammonia supply amount in real time, and the adjusting gate 7 adjusts the ammonia supply amount through online adjustment of the opening degree. Once the adjusting door 7 has a fault, the adjusting door 7 can be effectively isolated and processed under the condition of not stopping ammonia supply by opening the main path adjusting door bypass door 5, closing the manual door 6 in front of the adjusting door and closing the manual door 8 behind the adjusting door. When a pipeline in front of the pneumatic door 9 goes wrong, the standby ammonia pipeline 11 can be opened to supply ammonia by closing the ammonia supply main door 3 and the pneumatic door 9, so that the pipe section and equipment between the ammonia supply main door 3 and the pneumatic door 9 are effectively separated and treated under the condition of not stopping ammonia supply. Once the main ammonia supply pipeline behind the pneumatic door 9 has problems, the pneumatic door 9 can be closed, the bypass control door 21 connected behind the ammonia supply adjusting door and the hearth soot blowing steam inlet door 23 are opened, ammonia gas enters the ejector 25 through the bypass control door 21 connected behind the ammonia supply adjusting door and is mixed with hearth soot blowing steam entering through the hearth soot blowing steam inlet pipe 29 in the ejector 25, the ammonia gas enters the hearth 27 through the ammonia supply pipeline 1 behind the ejector 25 after the acceleration and the heating of the hearth soot blowing steam, and then enters the flue 27 after being uniformly distributed through the ammonia spraying grid nozzles of the 26 bypass pipelines, so that the denitration effect is achieved, and the device behind the pneumatic door 9 is effectively separated and treated under the condition of not stopping ammonia supply. In the same way, when the equipment is blocked after the ammonia supply main door 3, the ammonia supply main door 3 can be closed, the bypass control door 17 connected in front of the ammonia supply main door and the hearth soot blowing steam inlet door 23 are opened, ammonia enters the ejector 25 through the bypass control door 17 connected in front of the ammonia supply main door and is mixed with hearth soot blowing steam entering through the hearth soot blowing steam inlet pipe 29 in the ejector 25, the ammonia enters the hearth 27 after being accelerated and heated by the hearth soot blowing steam through the ammonia supply pipeline 1 behind the ejector 25 and then enters the flue 27 after being uniformly distributed by the ammonia injection grid nozzles of the 26 bypass pipelines, the denitration effect is achieved, and the equipment after the ammonia supply main door 3 is effectively blocked and is treated under the condition of not stopping ammonia supply. After the fault treatment is finished and the main circuit is switched to operate, steam purging needs to be immediately carried out on the bypass anti-blocking system, residual ammonia in the bypass anti-blocking system is removed, crystallization blocking is prevented, and the specific operation is that a heat tracing incoming steam purging main door 22, an ammonia supply main door bypass purging door 19 and an ejector purging door 24 are opened, so that heat tracing steam enters the bypass anti-blocking system to remove residual ammonia in the bypass anti-blocking system. The purging system can also be used for closing the ammonia supply main door 3, opening the bypass control door 17 connected in front of the ammonia supply main door and the hearth soot blowing inlet valve 23 and then throwing the ammonia supply main door and the hearth soot blowing inlet valve 23 into the bypass anti-blocking system, under the condition that the main ammonia supply system is blocked, opening the flow meter purging door 18 and the adjusting door purging door 20 to realize the online purging without stopping the ammonia supply for the system behind the flow meter 4 and the adjusting door 7, when the main pipeline of the denitration ammonia supply system of the boiler normally operating in the thermal power plant is blocked, an operator can quickly find the position of the manual door 8 behind the adjusting door on the ammonia supply pipeline 1 according to the search of a corresponding system diagram and carry out corresponding operation, and put the bypass of the system for preventing the blockage of the urea hydrolysis ammonia supply pipeline into use, on the one hand, because the hot primary air needs to be heated by the air preheater, the hot primary air can inevitably carry a large amount of furnace ash, and once the furnace ash is deposited on the elbow of the pipeline, Empty blender of ammonia, lateral pipe valve or nozzle department, will influence greatly and dilute the amount of wind and supply ammonia flow, on the other hand is in order not to let the ammonia crystallization, supply ammonia pipeline 1 still need have heat tracing steam, constantly give and supply ammonia pipeline heating, the innovation of this design lies in carrying the ammonia by hot primary air with traditional boiler deNOx systems for the first time and changing into carrying the ammonia by high temperature steam, after having used high temperature high pressure steam to carry the ammonia, on the one hand because steam is got from soot blower vapour source, it is impurity-free to belong to high quality steam, can stop the pipeline and block up, on the other hand because steam temperature itself can reach 350 ℃, good heat tracing effect has also been played when carrying the ammonia, effectively avoided the ammonia crystallization and the jam problem that causes.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.