CN212819167U - SCR ammonia injection grid nozzle purging device - Google Patents

Abstract

A purging device of an SCR ammonia spraying grid nozzle comprises a mounting seat, a compressed air main pipe and a boiler compressed air main pipe, wherein the mounting seat mainly comprises a welding base and a connector, and the welding base is welded with a pipe body of an ammonia spraying inlet pipe; the connector is provided with a through hole, is arranged on the welding base and is connected with a compressed air inlet valve; the compressed air main pipe is connected with each compressed air inlet valve to form a ventilation pipeline in parallel connection with each ammonia spraying inlet pipe; the end of giving vent to anger of boiler compressed air house steward is connected with the female pipe of compressed air, installs female pipe valve between boiler compressed air house steward and the female pipe of compressed air, and boiler compressed air house steward is connected with boiler main air compressor machine. According to the scheme, the method for cleaning the deposited dust of the ammonia spraying grid nozzle is improved by modifying the existing SCR system, so that the construction cost, the construction time, the high-altitude falling risk and the personnel health risk are greatly reduced, and the reliability and the economical efficiency of equipment are improved.

Description

SCR ammonia injection grid nozzle purging device

Technical Field

The utility model relates to a thermal power factory denitrification facility technical field, in particular to can carry out a modified SCR to spouting ammonia grid nozzle to the deposition clearance mode of spouting ammonia grid nozzle and sweep the device.

Background

In view of the great harm of nitrogen oxides to the natural environment and social economy, the emission control of the nitrogen oxides in developed countries of main industry in the world is very strict, so that in order to protect the environment and reduce the pollution of NOx, the idea that green water mountain is the Jinshanyinshan is trameted, and the flue gas denitration device is arranged in all the thermal power plants in China. Generally, a high-ash flue gas denitration (SCR) process is used for boiler denitration, and each boiler is provided with two SCR reactors.

Each SCR reactor is provided with an ammonia injection system, so that ammonia gas and flue gas are uniformly mixed before entering the SCR reactor body. The injection system has good thermal expansion, thermal deformation resistance and vibration resistance. Each set of the injection system has 80 ammonia injection grid nozzles. Due to the working condition requirement, the outlet of the nozzle faces upwards. In the blowing-out process, the ammonia flow in the nozzle is gradually reduced to zero, but the dust in the flue falls after hysteresis, so that the ammonia nozzle is very easy to be blocked by deposited dust, if the deposited dust is not cleaned in time, the deposited dust and the ammonia are mixed to form a very hard mixture in the process of starting the furnace, the nozzle is thoroughly blocked, and the ammonia is not uniformly distributed to influence the denitration efficiency.

Therefore, after each furnace shutdown, each nozzle needs to be subjected to dust suction treatment, the nozzles are located at high altitude, a scaffold needs to be erected, much labor is consumed for dust suction, pollutants exist in the dust, the dust is easy to hurt a human body, the dust accumulated on the collision nozzle is cleaned by a traditional method, the economic cost is high, and the safety and health risks exist.

In view of the above, the problem to be solved by the present invention is how to solve the problems of nozzle blockage caused by deposition of the ammonia-spraying grid nozzle of the conventional SCR reactor and high economic cost, insecurity, health damage and the like caused by disposing of the deposition.

Disclosure of Invention

The utility model provides a SCR spouts ammonia grid nozzle and sweeps device, its purpose is through spouting the transformation of ammonia grid to current SCR to solve the nozzle that the ammonia grid nozzle deposition of spouting of current SCR reactor brought and block up and handle the economic cost height that brings, dangerous, harm health scheduling problem when this deposition.

In order to achieve the above object, the utility model provides a SCR spouts ammonia grid nozzle and sweeps device, SCR spouts the ammonia grid and contains a plurality of and spouts the ammonia inlet tube, separately spout the top fixed connection ammonia nozzle of ammonia inlet tube, ammonia nozzle department is provided with spouts the ammonia flowmeter, sweep the device and include mount pad, female pipe of compressed air and boiler compressed air house steward, wherein:

the side surface of the pipe body of each ammonia spraying inlet pipe is welded with a mounting seat, each mounting seat comprises a welding base and a connector, and the welding base is welded with the pipe body of the ammonia spraying inlet pipe; the connector is provided with a through hole, one end of the connector is installed on the welding base, and the other end of the connector is connected with a compressed air inlet valve;

the compressed air main pipe is connected with each compressed air inlet valve to form a ventilation pipeline in parallel connection with each ammonia spraying inlet pipe, so that the ammonia spraying inlet pipes are communicated with the compressed air inlet valves;

the utility model discloses a boiler compressed air manifold, including boiler compressed air house steward give vent to anger, boiler compressed air house steward give vent to anger the end with the female union coupling of compressed air, boiler compressed air house steward with install female pipe valve between the female pipe of compressed air, boiler compressed air house steward's inlet end is connected with the main air compressor machine of boiler.

The related content of the utility model is explained as follows:

1. in the utility model, the connector has a first connecting part and a second connecting part which are tubular, the first connecting part is arranged on the welding base, the second connecting part is connected with the compressed air inlet valve, a sealing groove is arranged on the second connecting part, and a sealing ring which is correspondingly matched with the sealing groove is arranged in the compressed air inlet valve;

2. in the utility model, the first connecting part and the second connecting part incline downwards and form an inclination angle with the axis of the ammonia spraying inlet pipe, so that the gas flowing direction of the compressed air can be sprayed upwards in an inclined way towards the inside of the ammonia spraying inlet pipe, the speed of the compressed air flowing to the ammonia nozzle after the furnace is shut down is improved, and the time of dust deposition is reduced; the range of the inclination angle is 30-70 degrees; preferably, the angle of the inclination angle is 60 °, and the above-mentioned effect can be satisfied by the inclination angle of this angle. Meanwhile, the purging device is improved on the basis of the existing SCR reactor, the platform and the railing are arranged beside the ammonia spraying inlet pipe, so that a compressed air inlet valve is convenient to install, a sufficient installation space can be vacated by the way that the connecting head is obliquely and downwards arranged, and meanwhile, when the compressed air inlet valve needs to be manually opened by an operator, the body cannot be extended out of the railing, the operator can easily rotate a switch handle on the compressed air inlet valve when standing in the railing, and the safety is also improved;

3. in the utility model, a welding cutting opening is arranged on the side surface of the ammonia spraying inlet pipe, a welding pipe orifice corresponding to the welding cutting opening is arranged on the welding base, the welding base is welded to the welding cutting opening corresponding to the welding base through the welding pipe orifice, and the inclination angle of the welding pipe orifice is consistent with the inclination angles of the first connecting part and the second connecting part;

4. in the utility model, the boiler compressed air main pipe is connected with a boiler standby air compressor connected with the boiler main air compressor in parallel, when the pressure of the compressed air provided by the boiler main air compressor is insufficient, the boiler standby air compressor is started, so that the air pressure in the pipeline is kept stable;

5. the utility model discloses in, sweep the device still include with spout ammonia flowmeter, female pipe valve electric connection's safety instrument system, compressed air inlet valve adopts check valve to prevent gas refluence for check valve, female pipe valve is electromagnetism stop valve, adopts electromagnetism stop valve to conveniently come the controller to open, close by safety instrument system.

Because of the application of above-mentioned scheme, compared with the prior art, the utility model have following advantage and effect:

1. the above scheme of the utility model mainly solves the problems that the flow of ammonia gas in the nozzle is gradually reduced to zero, but the dust in the flue falls after lag, and the ammonia gas nozzle is easily blocked by the deposited dust in the blowing-out process by applying the blowing device, and can conveniently treat the deposited dust of the nozzle and carry out safe, economic and effective treatment;

2. in the scheme of the utility model, the dust deposition cleaning method of the ammonia spraying grid nozzle is improved through the innovative design of the purging device, so that the construction cost, the construction time, the high-altitude falling risk and the personnel health risk are greatly reduced, and the reliability and the economical efficiency of the equipment are improved;

3. the above technical scheme of the utility model, the improvement of doing is reformed transform on the basis of current SCR system, and some parts, the utensil that SCR system itself had have been ingenious, properly had used, and this kind of transformation can save a large amount of expenses of power plant, reduces and reforms transform the degree of difficulty to the platform that has utilized the SCR system carries out a series of designs and improvement, has improved the economic nature and the security of power plant greatly.

4. The above technical scheme of the utility model, on the dust of whereabouts just can not fall the ammonia nozzle, the benefit of avoiding the dust to subside nozzle department has just cut off follow-up ammonia and dust and has reacted and the jam that produces in the source, just also need not carry out the dust absorption again to the ammonia nozzle and handle.

Drawings

FIG. 1 is a schematic view of a purging device according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of an embodiment of the present invention in which a mounting seat is mounted on an ammonia injection inlet pipe;

FIG. 3 is an assembly view of the mounting base of the embodiment of the present invention mounted on the ammonia injection inlet pipe;

fig. 4 is a first schematic view of a mounting base in an embodiment of the present invention;

fig. 5 is a schematic diagram of a second embodiment of the mounting base of the present invention.

The drawings are shown in the following parts:

1. a mounting seat; 11. welding a base; 111. welding a pipe orifice; 12. a connector; 121. a first connection portion; 122. a second connecting portion; 1221. a sealing groove;

2. a compressed air inlet valve; 3. a compressed air main pipe; 4. a main pipe valve; 5. a boiler compressed air main; 6. a main air compressor of the boiler; 7. a safety instrumented system;

8. SCR ammonia injection grid; 81. an ammonia injection inlet pipe; 811. welding a cutting opening; 82. an ammonia gas nozzle;

9. the boiler is provided with a standby air compressor.

Detailed Description

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.

In the description of the present application, "a number" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

As shown in fig. 1 to 5, the utility model provides a SCR ammonia injection grid nozzle purging device, SCR ammonia injection grid 8 contains a plurality of ammonia injection inlet pipe 81, respectively the top fixed connection ammonia nozzle 82 of ammonia injection inlet pipe 81 to a current common model as an example, has 80 ammonia injection inlet pipes and corresponding ammonia nozzle 82, ammonia nozzle 82 department is provided with the ammonia injection flowmeter (ammonia injection flowmeter is not shown in the figure), the purging device includes mount pad 1, compressed air main pipe 3 and boiler compressed air main pipe 5, wherein:

the side surface of the pipe body of each ammonia spraying inlet pipe 81 is welded with a mounting seat 1, each mounting seat 1 mainly comprises a welding base 11 and a connector 12, and the welding base 11 is welded with the pipe body of the ammonia spraying inlet pipe 81; the connector 12 is provided with a through hole, one end of the connector 12 is installed on the welding base 11, and the other end of the connector 12 is connected with the compressed air inlet valve 2 to form communication between the ammonia spraying inlet pipe 81 and the compressed air inlet valve 2;

the compressed air main pipe 3 is connected with each compressed air inlet valve 2 to form a ventilation pipeline connected with each ammonia spraying inlet pipe 81 in parallel;

the utility model discloses a boiler compressed air manifold, including boiler compressed air house steward 5, boiler compressed air house steward 5 give vent to anger the end with female pipe 3 of compressed air is connected, boiler compressed air house steward 5 with install female pipe valve 4 between the female pipe 3 of compressed air, the inlet end of boiler compressed air house steward 5 is connected with boiler main air compressor 6.

In the above embodiment, the connecting head 12 has the first connecting portion 121 and the second connecting portion 122 in a tubular shape, the first connecting portion 121 is mounted on the welding base 11, the second connecting portion 122 is connected to the compressed air inlet valve 2, the second connecting portion 122 is provided with the sealing groove 1221, and the compressed air inlet valve 2 is provided with the sealing ring (the sealing ring is not shown in the figure) correspondingly matched with the sealing groove 1221; the first connecting part 121 and the second connecting part 122 are inclined downwards and form an inclined angle with the axis of the ammonia spraying inlet pipe 81, so that the gas flowing direction of the compressed air can be sprayed upwards in an inclined way towards the inside of the ammonia spraying inlet pipe 81, the speed of the compressed air flowing to the ammonia gas nozzle 82 after the furnace is stopped is improved, and the dust deposition time is reduced; the range of the inclination angle is 30-70 degrees; preferably, the angle of the inclination angle is 60 °, and the above-mentioned effect can be satisfied by the inclination angle of this angle. Simultaneously, adopt this angle of inclination still other benefits, because this sweep the device and be the transformation of going on the basis of current SCR reactor, it sets up a platform and railing to spout ammonia inlet tube 81's next door, for the ease of installation compressed air inlet valve 2, sufficient installation space can be vacated to the mode that connector 12 slope set up downwards, simultaneously need be unlikely to stretch out the railing with the health when opening compressed air inlet valve by the operating personnel manual work outside, only stretch out with the hand can, operating personnel stands and also can easily go the switch handle on the rotatory compressed air inlet valve in the railing, the security has also been increased.

In the above embodiment, the side surface of the ammonia injection inlet pipe 81 is opened with a welding cut 811, the welding base 11 is provided with a welding nozzle 111 corresponding to the welding cut 811, the welding base 11 is welded to the welding cut 811 corresponding thereto through the welding nozzle 111, and the inclination angle of the welding nozzle 111 is consistent with the inclination angles of the first connecting portion 121 and the second connecting portion 122.

In the above embodiment, the boiler compressed air header pipe 5 is connected to a boiler standby air compressor 9 connected in parallel with the boiler main air compressor 6, a pressure gauge capable of monitoring the pressure of the pipeline air in the purging working state in real time can be arranged on the compressed air main pipe 3, and when the pressure of the compressed air provided by the boiler main air compressor 6 is less than 0.75 mpa, the boiler standby air compressor 9 is started to keep the pressure of the air in the pipeline stable.

In the above embodiment, the purging device further comprises a Safety Instrument System (SIS) 7 electrically connected with the ammonia injection flowmeter and the main pipe valve 4, the compressed air inlet valve 2 is a check valve, the check valve is adopted to prevent gas from flowing backwards, the main pipe valve 4 is an electromagnetic stop valve, and the electromagnetic stop valve is adopted to facilitate the controller to be opened and closed by the safety instrument system 7.

The embodiment of the utility model provides a reform transform on the basis of current SCR system, install mount pad 1 and compressed air inlet valve 2 additional on the ammonia inlet tube 81 that spouts of current SCR reactor, with every compressed air inlet valve 2 by the female pipe 3 of compressed air and hookup connect the back and insert boiler compressed air house steward 5 again, 6 work of boiler main air compressor machine continue to the ammonia nozzle 82 jet stream, the dust of whereabouts just can not fall on the ammonia nozzle 82 this moment. After the Huarun electric power (rare) limited company is used in the unit shutdown, the unit can be normally started after the ammonia spraying grid nozzle deposition is cleaned by the method, the cleaning effect is consistent with that of the traditional method, no abnormal condition is found, the problems of high cost, long time, large safety risk and the like of cleaning the deposition of the ammonia spraying grid 82 during shutdown maintenance are thoroughly solved, the problem that the cleaning of the ammonia spraying grid 82 of the power plant is not a big problem any more is solved, and the economy and the safety of the power plant are improved.

In addition, it should be noted that the connection relationship, the control relationship, and the like between the ammonia injection flow meter, the safety instrument system 7, the main pipe valve 4, the main boiler air compressor 6, the standby boiler air compressor 9, and the like, and the power supply belong to the prior art, and therefore, no specific description is provided herein.

The embodiment of the utility model provides an implement the flow can refer to as follows:

1. the purging device is installed in the SCR system, so that no problem of tightness among pipelines is ensured, and normal work of each meal and each inductor is ensured;

2. when an ammonia injection flow meter in a picture of a Safety Instrument System (SIS) 7 displays that the flow of ammonia in the ammonia nozzle 82 of the current ammonia injection grid is close to zero after the furnace is shut down, a main pipe valve 4 is manually opened or controlled by a controller to be opened, and then a compressed air inlet valve 2 is sequentially opened;

3. the main air compressor 6 of the boiler conveys compressed air to the compressed air main pipe 3, so that the compressed air continuously sprays airflow to blow and sweep from the ammonia nozzle 82, dust is prevented from falling onto the ammonia nozzle 82, and the problem of blockage of the ammonia nozzle 82 is solved;

4. after 8 hours of furnace shutdown, the main pipe valve 4 is closed, and the purging operation of the ammonia gas nozzle 82 is completed.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims (9)

1. An SCR ammonia injection grid nozzle purging device, the SCR ammonia injection grid (8) contains a plurality of ammonia injection inlet pipes (81), the top of each ammonia injection inlet pipe (81) is fixedly connected with an ammonia nozzle (82), characterized in that, the purging device includes a mounting seat (1), a compressed air main pipe (3) and a boiler compressed air main pipe (5), wherein:

the side face of the pipe body of each ammonia spraying inlet pipe (81) is welded with a mounting seat (1), each mounting seat (1) comprises a welding base (11) and a connector (12), and the welding bases (11) are welded with the pipe body of the ammonia spraying inlet pipe (81); the connector (12) is provided with a through hole, one end of the connector (12) is installed on the welding base (11), and the other end of the connector is connected with a compressed air inlet valve (2) to form communication between the ammonia spraying inlet pipe (81) and the compressed air inlet valve (2);

the compressed air main pipe (3) is connected with each compressed air inlet valve (2) to form a ventilation pipeline in parallel connection with each ammonia spraying inlet pipe (81);

the utility model discloses a boiler air compression manifold, including boiler compressed air house steward (5), the end of giving vent to anger of boiler compressed air house steward (5) with female pipe of compressed air (3) are connected, boiler compressed air house steward (5) with install female pipe valve (4) between female pipe of compressed air (3), the inlet end of boiler compressed air house steward (5) is connected with boiler main air compressor machine (6).

2. The SCR ammonia injection grid nozzle purging device of claim 1, wherein: connector (12) have the shape and be pipy first connecting portion (121) and second connecting portion (122), install on welding base (11) first connecting portion (121), second connecting portion (122) with compressed air inlet valve (2) link to each other, be provided with seal groove (1221) on second connecting portion (122), be provided with in compressed air inlet valve (2) with seal groove (1221) correspond the complex sealing washer.

3. The SCR ammonia injection grid nozzle purging device of claim 2, wherein: the first connecting part (121) and the second connecting part (122) are inclined downwards and form an inclined angle with the axis of the ammonia spraying inlet pipe (81), and the size of the inclined angle ranges from 30 degrees to 70 degrees.

4. The SCR ammonia injection grid nozzle purging device of claim 3, wherein: the angle of the inclined angle is 60 °.

5. The SCR ammonia injection grid nozzle purging device of any one of claims 3 or 4, wherein: welding cuts (811) are formed in the side face of the ammonia spraying inlet pipe (81), a welding pipe orifice (111) corresponding to the welding cuts (811) is arranged on the welding base (11), and the inclination angle of the welding pipe orifice (111) is consistent with the inclination angles of the first connecting portion (121) and the second connecting portion (122).

6. The SCR ammonia injection grid nozzle purging device of claim 1, wherein: and the boiler compressed air main pipe (5) is connected with a boiler standby air compressor (9) which is connected with the boiler main air compressor (6) in parallel.

7. The SCR ammonia injection grid nozzle purging device of claim 1, wherein: ammonia nozzle (82) department is provided with spouts the ammonia flowmeter, purge device still include with spout ammonia flowmeter, main pipe valve (4) electric connection's safety instrument system (7).

8. The SCR ammonia injection grid nozzle purging device of claim 7, wherein: the compressed air inlet valve (2) is a check valve.

9. The SCR ammonia injection grid nozzle purging device of claim 7, wherein: the main pipe valve (4) is an electromagnetic stop valve.

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