Pulse injection valve and carbon-free injection system of clean type fixed bed gasification bag type dust collector

Abstract

The utility model discloses a cleaning type fixed bed gasification bag type dust collector pulse injection valve which comprises an annular valve seat, an injection pipe seat is concentrically arranged in the annular valve seat, and the bottom of the periphery of the injection pipe seat is fixedly connected with the annular valve seat through a plurality of supporting short arms. A diaphragm assembly and a main valve cover are sequentially assembled on the upper surface of the annular valve seat; a circular cover plate in the middle of the diaphragm assembly is just positioned above the blowing pipe seat, and the bottom surface of the circular cover plate seals the port of the blowing pipe seat in a normal state; a spring is assembled in the center of the upper surface of a circular cover plate in the middle of the diaphragm assembly; and one or more balance air pressure holes are formed in an outer edge diaphragm of the diaphragm assembly. According to the utility model, the blowing gas source of the dust remover is blown by nitrogen instead of semi-water gas used at present, so that not only are the safety and environmental protection problems of field alarm solved, but also the problem of short service life of equipment are solved, the use cost of spare parts of the whole set of equipment is relatively reduced, and meanwhile, the normal operation of production is not influenced.

Description

Technical Field

[0001] The utility model belongs to the technical field of bag dust removal jetting technology, and relates to a pulse jet valve, in particular to a pulse jet valve for a clean fixed bed gasification bag dust collector and a carbon-free jetting system. Background Art

[0002] The pulse valve jetting gas source of the bag dust collector of the clean fixed bed gasification device is the second-stage outlet gas of the raw material gas compressor in the subsequent section (the main component contains carbon monoxide). Since there are more oil, water and impurities entrained in the jetting gas, it directly affects the service life of the pipeline filter, the pulse valve and the dust collector bag. At the same time, the working principle of the pulse valve is that during its operation, the valve cavity needs to be quickly depressurized regularly, and then the jetting gas enters the system to jet the bag. The depressurized gas is directly discharged into the air (carbon monoxide escapes), which easily causes the toxic and flammable gas over-standard alarm around the device to alarm frequently, not meeting the current safety, clean and environmental protection requirements. Content of the Utility Model

[0003] The utility model provides a pulse jet valve for a clean fixed bed gasification bag dust collector and a carbon-free jetting system, which are used for replacing the pulse valve gas source of the clean fixed bed gasification bag dust collector, and using inert gas to replace toxic and flammable gas to solve the adverse effects such as valve corrosion, over-standard of toxic and flammable gas and waste of effective gas caused by the jetting gas during operation.

[0004] The utility model is realized by adopting the following technical scheme:

[0005] A pulse jet valve for a clean fixed-bed gasification bag filter, comprising an annular valve seat, within which a jet pipe seat is concentrically arranged. The bottom of the outer circumference of the jet pipe seat is fixedly connected to the annular valve seat through a number of supporting short arms; on the upper surface of the annular valve seat, a diaphragm assembly and a main valve cover are sequentially assembled; the circular cover plate in the middle of the diaphragm assembly is exactly located above the jet pipe seat, and its bottom surface closes the port of the jet pipe seat under normal conditions; a spring is assembled at the center of the upper surface of the circular cover plate in the middle of the diaphragm assembly; one or more balanced air pressure holes are provided on the outer edge diaphragm of the diaphragm assembly; a central cavity is coaxially and fixedly arranged within the protruding part of the main valve cover, that is, an annular cavity is formed between the central cavity and the protruding part of the main valve cover; the upper end of the spring is assembled on the bottom surface of the central cavity, and a bottom cavity is formed between the bottom of the main valve cover and the diaphragm assembly; the annular cavity and the bottom cavity are connected; a pressure relief hole is provided on the protruding part of the main valve cover, and the pressure relief hole passes through the annular cavity and is connected to the central cavity; on the upper surface of the protruding part of the main valve cover, a pilot magnetic diaphragm assembly and a pilot valve cover are sequentially assembled; the circular magnetic cover plate in the middle of the pilot magnetic diaphragm assembly is exactly located above the central cavity, and its bottom surface closes the port of the central cavity under normal conditions; balanced air pressure small holes are provided on the outer edge diaphragm of the pilot magnetic diaphragm assembly; a top cavity is formed between the bottom surface of the pilot valve cover and the pilot magnetic diaphragm assembly, and the top cavity is connected to the annular cavity through the balanced air pressure small holes; a coil winding post is provided outside the pilot valve cover.

[0006] Further preferably, an O-ring seal is provided on the inner wall of the jet pipe seat. An O-ring seal is provided on the bottom surface of the annular valve seat.

[0007] Further preferably, the outer peripheral edge of the main valve cover and the outer peripheral edge of the diaphragm assembly are assembled on the upper surface of the annular valve seat through screws. The outer peripheral edge of the pilot valve cover and the outer peripheral edge of the pilot magnetic diaphragm assembly are assembled on the upper surface of the protruding part of the main valve cover through screws.

[0008] Further preferably, 2 pressure relief holes are symmetrically provided on the protruding part of the main valve cover.

[0009] Further preferably, the annular valve seat is hermetically assembled on the flange seat of the jet high-pressure gas collecting box through screws, and the jet pipe located at the center of the flange seat is hermetically inserted into the jet pipe seat.

[0010] During operation, a coil is wound around a coil winding post to form an electromagnetic component, which is energized or de-energized according to a program. After the electromagnetic component is energized, it attracts and actuates the pilot magnetic diaphragm assembly, that is, the pilot magnetic diaphragm assembly moves upward to open the port of the central cavity. At this time, the annular cavity and the bottom cavity in the main valve cover are filled with spray and blowing air pressure, which enters the central cavity through the opened pilot magnetic diaphragm assembly and then is depressurized to atmospheric pressure through the pressure relief hole. Since the annular valve seat is sealed and assembled on the flange seat of the spray high-pressure gas collecting box, and the spray pipe located at the center of the flange seat is sealed and extends into the spray pipe seat, the high-pressure gas (spray and blowing air) in the sandwich layer of the spray high-pressure gas collecting box fills the space outside the spray pipe seat. At this time, due to the pressure difference formed with the inside of the main valve cover, the high-pressure spray and blowing air quickly pushes the diaphragm of the diaphragm assembly upward, and the spray and blowing air enters the spray pipe through the diaphragm assembly and the port of the spray pipe seat to achieve spraying. After instantaneous spraying, the electromagnetic component at the top is de-energized, and the pilot magnetic diaphragm assembly moves downward to return to its original position and closes the port of the central cavity through the circular magnetic cover plate. The spray and blowing air enters the bottom cavity and the annular cavity in the main valve cover through the balance air pressure hole on the diaphragm assembly, gradually equalizing the pressure in the main valve cover and the pressure outside the spray pipe seat in the valve body. The diaphragm assembly is controlled by a spring to return to its original position and seals the port of the spray pipe seat through the circular cover plate; at the same time, the spray and blowing air in the main valve cover also enters the top cavity through the balance air pressure small hole on the pilot magnetic diaphragm assembly, gradually equalizing the pressure in the top cavity and the pressure in the main valve cover, so that the pilot magnetic diaphragm assembly will not be pushed open by the spray and blowing air in the valve cover, enabling the circular magnetic cover plate to well seal the port of the central cavity. When the electromagnetic component on the pilot valve cover is energized again, the above actions are repeated in sequence to perform the pressure relief, spraying, and stamping procedures.

[0011] A carbon-free spraying system includes a high-pressure nitrogen buffer tank and a bag type dust collector, and the above-mentioned pulse spraying valve is installed on the top of the bag type dust collector; the air outlet of the high-pressure nitrogen buffer tank is connected to the inlet of the filter through a pipeline, and the outlet of the filter is connected to the inlet of the spray high-pressure gas collecting box through a pipeline.

[0012] Further preferably, the filter is connected to two bag type dust collectors in parallel through pipelines.

[0013] During operation, the high-pressure nitrogen in the high-pressure nitrogen buffer tank is used as the spray and blowing air. After entering the sandwich layer of the spray high-pressure gas collecting box and reaching the preset pressure, it enters the pulse spraying valve, and then enters the spray pipe to spray the cloth bag; finally, a cyclic action is performed, and the pressure relief, spraying, and stamping procedures are repeated.

[0014] Compared with the prior art, the technical solution provided by the present utility model, after the nitrogen recovery situation during the operation of the accounting system is verified and subtracted from the direct conversion to the intermediate injection gas volume, without adjusting the system process, the dust collector injection gas source is changed from the semi-water gas currently used to nitrogen injection. This not only solves the safety and environmental protection problems of on-site alarms but also solves the problem of short equipment service life, relatively reducing the spare parts usage cost of the entire set of equipment. At the same time, it will not affect the normal operation of production and has good practical application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings herein are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present utility model and, together with the specification, are used to explain the principles of the present utility model.

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It represents a structural schematic diagram of the pulse injection valve of the clean fixed-bed gasification bag filter of the present utility model.

[0018] Figure 2 It represents a schematic diagram of the carbon-free injection system of the present utility model.

[0019] In the figure: 1 - annular valve seat, 2 - injection pipe seat, 3 - support short arm, 4 - diaphragm assembly, 41 - circular cover plate, 42 - balanced air pressure hole, 5 - main valve cover, 6 - spring, 7 - central cavity, 8 - pressure relief hole, 9 - pilot magnetic diaphragm assembly, 91 - circular magnetic cover plate, 92 - balanced air pressure small hole, 10 - pilot valve cover, 11 - coil winding post, 12 - O-ring seal, 13 - annular cavity, 14 - bottom cavity, 15 - top cavity; 100 - high-pressure nitrogen buffer tank, 200 - filter, 300 - bag filter, 400 - stop valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] In order to more clearly understand the above objects, features, and advantages of the present utility model, the following will further describe the solution of the present utility model. It should be noted that, without conflict, the embodiments of the present utility model and the features in the embodiments can be combined with each other.

[0021] In the description, it should be noted that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. It should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "joined" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0022] In the following description, many specific details are set forth in order to provide a thorough understanding of the present utility model, but the present utility model may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0023] The specific embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.

[0024] A pulse jet valve for a clean fixed bed gasification bag filter, comprising an annular valve seat 1, a jet pipe seat 2, a diaphragm assembly 4, a main valve cover 5, a spring 6, a pilot magnetic diaphragm assembly 9, a pilot valve cover 10 and other components.

[0025] As Figure 1 shown, a jet pipe seat 2 is concentrically arranged inside the annular valve seat 1, and the bottom of the outer periphery of the jet pipe seat 2 is fixedly connected to the annular valve seat 1 through a plurality of support short arms 3. It can be understood that the annular valve seat 1 is a planar structure and is fixedly connected to the jet pipe seat 2 through 4 support short arms arranged in a cross direction.

[0026] As Figure 1 shown, a diaphragm assembly 4 and a main valve cover 5 are sequentially assembled on the upper surface of the annular valve seat 1 by screws; it can be understood that 4 to 8 screw holes are arranged around the periphery of the diaphragm assembly 4, and similarly, 4 to 8 screw holes are relatively arranged around the bottom of the main valve cover 5. The outer peripheral edge of the main valve cover 5 and the outer peripheral edge of the diaphragm assembly 4 are assembled on the upper surface of the annular valve seat 1 by screws.

[0027] As Figure 1 shown, the circular cover plate 41 in the middle of the diaphragm assembly 4 is exactly located above the jet pipe seat 2, and the bottom surface of the circular cover plate 41 closes the port of the jet pipe seat 2 under normal conditions. A spring 6 is assembled at the center of the upper surface of the circular cover plate 41 in the middle of the diaphragm assembly 4; one or more balance air pressure holes 42 are provided on the outer edge diaphragm of the diaphragm assembly 4.

[0028] As Figure 1As shown in the figure, a central cavity 7 is coaxially and fixedly arranged inside the protruding part of the main valve cover 5, that is, an annular cavity 13 is formed between the central cavity 7 and the protruding part of the main valve cover 5. The upper end of the spring 6 is assembled on the bottom surface of the central cavity 7. A bottom cavity 14 is formed between the bottom of the main valve cover 5 and the diaphragm assembly 4. The annular cavity 13 and the bottom cavity 14 are connected. It can be understood that the bottom of the central cavity 7 is connected to the inner bottom wall of the protruding part of the main valve cover 5 through a supporting surface, so that the central cavity 7 can be supported in the middle of the protruding part, and then a through hole is opened in the supporting surface to realize the connection between the annular cavity 13 and the bottom cavity 14. A pressure relief hole 8 (or two pressure relief holes 8 are symmetrically arranged) is provided on the protruding part of the main valve cover 5. The pressure relief hole 8 needs to pass through the annular cavity 13 and then communicate with the central cavity 7 to realize the connection between the central cavity and the outside.

[0029] As Figure 1 shown in the figure, a pilot magnetic diaphragm assembly 9 and a pilot valve cover 10 are sequentially assembled on the upper surface of the protruding part of the main valve cover 5; it can be understood that 4 screw holes are arranged around the periphery of the pilot magnetic diaphragm assembly 9, and similarly, 4 screw holes are relatively arranged around the bottom of the pilot valve cover 10. The outer peripheral edge of the pilot valve cover 10 and the outer peripheral edge of the pilot magnetic diaphragm assembly 9 are assembled on the upper surface of the protruding part of the main valve cover 5 through screws.

[0030] As Figure 1 shown in the figure, the circular magnetic cover plate 91 in the middle of the pilot magnetic diaphragm assembly 9 is exactly located above the central cavity 7, and the bottom surface of the circular magnetic cover plate 91 closes the port of the central cavity 7 under normal conditions. Balance air pressure small holes 92 are provided on the outer edge diaphragm of the pilot magnetic diaphragm assembly 9; a top cavity 15 is formed between the bottom surface of the pilot valve cover 10 and the pilot magnetic diaphragm assembly 9, and the top cavity 15 is connected to the annular cavity 13 through the balance air pressure small holes 92. During specific implementation, a lower through groove communicating with the annular cavity can be provided on the upper surface of the protruding part of the main valve cover 5, and an upper through groove communicating with the top cavity is also provided at the corresponding position on the bottom surface of the pilot valve cover 10 (that is, the positions of the upper through groove and the lower through groove are opposite). The pilot magnetic diaphragm assembly 9 is assembled between the upper surface of the protruding part of the main valve cover 5 and the bottom surface of the pilot valve cover 10, and the balance air pressure small holes 92 are arranged at the positions of the upper and lower through grooves on the outer edge diaphragm of the pilot magnetic diaphragm assembly 9, so as to realize the connection between the top cavity 15 and the annular cavity 13.

[0031] As Figure 1 shown in the figure, a coil winding post 11 is provided outside the pilot valve cover 10. After winding the coil, an electromagnetic component is formed, and the coil is powered on and off according to the program.

[0032] During specific implementation, an O-ring 12 is provided on the inner wall of the blowpipe seat 2. An O-ring 12 is provided on the bottom surface of the annular valve seat 1.

[0033] The annular valve seat 1 is hermetically assembled on the flange seat of the high-pressure gas collecting tank for injection by screws, and the sealing is achieved through the O-ring 12. The injection pipe located at the center of the flange seat is hermetically inserted into the injection pipe seat 2, and the sealing is also achieved through the O-ring 12. It should be noted here that the injection pipe is built into the middle of the high-pressure gas collecting tank for injection, and the high-pressure gas is located in the interlayer between the outer layer of the collecting tank and the injection pipe.

[0034] During specific operation, after winding the coil on the coil winding post 11 to form an electromagnetic component, it is energized or de-energized according to the program. After the electromagnetic component is energized, it sucks the pilot magnetic diaphragm assembly 9 to act, that is, the pilot magnetic diaphragm assembly 9 moves upward to open the port of the central cavity 7. At this time, the injection gas pressure in the annular cavity 13 and the bottom cavity 14 in the main valve cover 5 enters the central cavity 7 through the opening of the pilot magnetic diaphragm assembly 9 and then is depressurized to atmospheric pressure through the pressure relief hole 8. Since the annular valve seat 1 is hermetically assembled on the flange seat of the high-pressure gas collecting tank for injection, and the injection pipe located at the center of the flange seat is hermetically inserted into the injection pipe seat 2, the high-pressure gas (injection gas) in the interlayer of the high-pressure gas collecting tank for injection fills the space outside the injection pipe seat 2. And at this time, there is a pressure difference formed with the inside of the main valve cover 5, so the high-pressure injection gas quickly pushes the diaphragm 4 of the diaphragm assembly upward. The injection gas enters the injection pipe through the diaphragm assembly 4 and the port of the injection pipe seat 2 to achieve injection. After achieving instantaneous injection, the electromagnetic component at the top is de-energized, and the pilot magnetic diaphragm assembly 9 moves downward to return to its original position and closes the port of the central cavity 7 through the circular magnetic cover plate 91. The injection gas is sent into the bottom cavity 14 and the annular cavity 13 in the main valve cover 5 through the balance air pressure hole 42 on the diaphragm assembly 4, gradually equalizing the pressure in the main valve cover 5 and the pressure outside the injection pipe seat 2 in the valve body 1. The spring 6 controls the diaphragm assembly 4 to return to its original position and seals the port of the injection pipe seat 2 through the circular cover plate 41. At the same time, the injection gas in the main valve cover 5 also enters the top cavity 15 through the balance air pressure small hole 92 on the pilot magnetic diaphragm assembly 9, gradually equalizing the pressure in the top cavity 15 and the pressure in the main valve cover 5. In this way, the pilot magnetic diaphragm assembly 9 will not be pushed open by the injection gas in the valve cover 5, enabling the circular magnetic cover plate 91 to well seal the port of the central cavity 7. When the electromagnetic component on the pilot valve cover 10 is energized again, the above actions are repeated in sequence to perform the pressure relief, injection, and stamping procedures.

[0035] Such as Figure 2As shown in the figure, a carbon-free injection system includes a high-pressure nitrogen buffer tank 100 and a bag filter 300. The pulse injection valve mentioned above is installed at the top of the bag filter 300 (the injection high-pressure gas collecting tank is installed at an appropriate position at the top of the bag filter 300), that is, the injection pipe in the injection high-pressure gas collecting tank is aligned with the area to be injected. The gas outlet of the high-pressure nitrogen buffer tank 100 is connected to the inlet of the filter 200 through a pipeline (a stop valve 400 can be installed on the pipeline), and the outlet of the filter 200 is connected to the inlet of the injection high-pressure gas collecting tank through a pipeline (a stop valve 400 can be installed on the pipeline). The high-pressure nitrogen in the high-pressure nitrogen buffer tank 100 is used as the injection gas. After entering the interlayer of the injection high-pressure gas collecting tank and reaching the preset pressure, it enters the pulse injection valve, and then enters the injection pipe to inject the cloth bag; finally, a cyclic action is performed, and the pressure relief, injection, and stamping procedures are repeated.

[0036] During specific implementation, the filter 200 can be connected in parallel to two or more bag filters 300 through pipelines.

[0037] The carbon-free injection system described in the present utility model uses the principle of substitution to maintain the stability of the gas components by adjusting the recovery time during the production process and supplement nitrogen to the system; at the same time, the high-purity nitrogen separated after the oxygen production by the air separation unit is directly used for supplementation, replacing the original semi-water gas as the injection gas source; reducing the recovery time and stabilizing the gas components in the system. At the same time, it effectively solves the situation of excessive combustible gas caused by the escape of combustible and toxic gases.

[0038] 1. Injection gas volume:

[0039] The single set of dust collector system in the direct conversion room has 2 injection pulse valve groups, the shortest injection interval time is 15s, and combined with the use of injection gas for ash transportation, the maximum gas consumption of a single set of system is 300m 3 / h, and the maximum gas consumption of four sets of systems is 1200m 3 / h.

[0040] 2. After calculating the maximum injection gas volume, the recovery situation of the gasifier:

[0041] When the system is producing at a five-machine load, 11.4 gasifiers are started per hour. The gasifier can adjust the recovery time to about 57s, and the recovered air gas volume is 6969.4m 3 / h, of which the nitrogen content is 5505.8m 3 / h, which is equivalent to recovering 96.6m 3 / s of nitrogen per second during the recovery time; combined with the injection gas volume, the recovery time needs to be reduced by 12.4s, and the remaining recovery time of 44.6s can be adjusted without affecting the system operation.

[0042] The system has four machines in full load production, with 10 gasification furnaces running per hour. The gasifier can adjust the recovery time to about 50 seconds, and the amount of recovered air gas is 6028.6m 3 / h, of which nitrogen content is 4762.6m 3 / h, which is equivalent to recycling 96.3m of nitrogen per second 3 / s; combined with the injection gas volume, the recovery time needs to be reduced by 12.6s, and the remaining recovery time of 37.4s can be adjusted without affecting the system operation.

[0043] The system has three machines in full load production, with 8 gas furnaces running per hour. The gas furnace can adjust the recovery time to about 40 seconds, and the amount of recovered air gas is 4878m 3 / h, of which nitrogen content is 3853m 3 / h, which is equivalent to recycling 96.3m of nitrogen per second 3 / s; combined with the injection gas volume, the recovery time needs to be reduced by 12.5s, and the remaining recovery time of 27.5s can be adjusted without affecting the system operation.

[0044] After calculating the nitrogen recovery situation of the system operation and the amount of gas injected in the direct conversion room, the dust collector injection gas source was changed from the original semi-water gas to nitrogen injection without adjusting the system process. This not only solved the safety and environmental protection problems of on-site alarms, but also solved the problem of short equipment life cycle, and relatively reduced the cost of spare parts for the entire set of equipment. At the same time, it will not affect the normal operation of production.

[0045] The above is only a specific implementation of the utility model, which enables those skilled in the art to understand or implement the utility model. Although detailed descriptions are made with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments, and they should all be covered by the protection scope of the claims.

Claims

1. A clean fixed bed gasification bag filter pulse jet valve, characterized in that: It comprises an annular valve seat (1), a blowing pipe seat (2) is concentrically arranged inside the annular valve seat (1), and the outer bottom of the blowing pipe seat (2) is fixedly connected to the annular valve seat (1) via a plurality of supporting short arms (3); The upper surface of the annular valve seat (1) is sequentially assembled with a diaphragm assembly (4) and a main valve cover (5); The circular cover plate (41) in the middle of the diaphragm assembly (4) is located just above the blow pipe seat (2), and in a normal state, the bottom surface of the circular cover plate (41) closes the port of the blow pipe seat (2); a spring (6) is mounted at the center of the upper surface of the circular cover plate (41) in the middle of the diaphragm assembly (4); and one or more balancing air pressure holes (42) are provided on the outer edge diaphragm of the diaphragm assembly (4); A central cavity (7) is coaxially fixedly arranged in the protruding portion of the main valve cover (5), that is, an annular cavity (13) is formed between the central cavity (7) and the protruding portion of the main valve cover (5); the upper end of the spring (6) is mounted on the bottom surface of the central cavity (7), and a bottom cavity (14) is formed between the bottom of the main valve cover (5) and the diaphragm assembly (4); the annular cavity (13) and the bottom cavity (14) are connected; the protruding portion of the main valve cover (5) is provided with a pressure relief hole (8), and the pressure relief hole (8) passes through the annular cavity (13) and is connected to the central cavity (7); The upper surface of the raised portion of the main valve cover (5) is sequentially assembled with a pilot magnetic diaphragm assembly (9) and a pilot valve cover (10); The circular magnetic cover plate (91) in the middle of the pilot magnetic diaphragm assembly (9) is located just above the central cavity (7), and under normal conditions, the bottom surface of the circular magnetic cover plate (91) closes the port of the central cavity (7); a balanced air pressure hole (92) is provided on the outer edge diaphragm of the pilot magnetic diaphragm assembly (9); a top cavity (15) is formed between the bottom surface of the pilot valve cover (10) and the pilot magnetic diaphragm assembly (9), and the top cavity (15) is connected to the annular cavity (13) through the balanced air pressure hole (92); A coil winding column (11) is disposed outside the pilot valve cover (10).

2. According to claim 1, a pulse jet valve for a clean fixed bed gasification bag filter is characterized in that: An O-type sealing ring (12) is provided on the inner wall of the blowing pipe seat (2).

3. The pulse jet valve of a clean fixed bed gasification bag filter according to claim 2 is characterized in that: An O-type sealing ring (12) is provided on the bottom surface of the annular valve seat (1).

4. The pulse jet valve of a clean fixed bed gasification bag filter according to claim 3 is characterized in that: The outer periphery of the main valve cover (5) and the outer periphery of the diaphragm assembly (4) are assembled on the upper surface of the annular valve seat (1) by means of screws.

5. The pulse jet valve of a clean fixed bed gasification bag filter according to claim 4 is characterized in that: The outer periphery of the pilot valve cover (10) and the outer periphery of the pilot magnetic diaphragm assembly (9) are assembled to the upper surface of the protruding portion of the main valve cover (5) by means of screws.

6. The pulse jet valve of a clean fixed bed gasification bag filter according to claim 5 is characterized in that: The raised portion of the main valve cover (5) is symmetrically provided with two pressure relief holes (8).

7. The pulse jet valve of a clean fixed bed gasification bag filter according to claim 6 is characterized by: The annular valve seat (1) is assembled on the flange seat of the injection high-pressure gas collecting box through screw sealing, and the injection pipe seal located at the center of the flange seat extends into the injection pipe seat (2).

8. A carbon-free blowing system, comprising a high-pressure nitrogen buffer tank (100) and a bag filter (300), characterized in that: The pulse jet valve according to claim 7 is installed on the top of the bag filter (300); The gas outlet of the high-pressure nitrogen buffer tank (100) is connected to the inlet of the filter (200) through a pipeline, and the outlet of the filter (200) is connected to the gas inlet of the injection high-pressure gas collecting box through a pipeline.

9. The carbon-free injection system according to claim 8, characterized in that: The filter (200) is connected in parallel to two bag dust collectors (300) via a pipeline.

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