A dual-mode back-blowing dust cleaning switching mechanism and device for a bag filter of a dry dedusting system of a blast furnace

Abstract

The application discloses a kind of high furnace dry dedusting cloth bag double mode blowback dust cleaning switching mechanism and device, including, including intercommunication component, including intercommunication seat, intercommunication pipe located in the top of the intercommunication seat, nitrogen gas inlet pipe located in the bottom of the intercommunication seat, clean flue gas blowback pipe located in the one side of the intercommunication seat and nitrogen gas blowback pipe located in the other side of the intercommunication seat;And, switching component, including anti-pressure piece set in the inside of the nitrogen gas inlet pipe.This application is through the linkage cooperation between anti-pressure piece, plugging piece and two control pieces, according to the pressure effect of high-pressure clean gas main pipe internal pressure to anti-pressure piece spring, so that switching mechanism can be according to high-pressure clean gas main pipe internal pressure and select dust cleaning mode self-adapting, so that the switching operation of double mode can be in time according to the change of high-pressure clean gas main pipe internal pressure, ensure stable dust cleaning to dust removal cloth bag, reduce the operation step of user, meet the use demand of user.

Description

Technical Field

[0001] This invention relates to the field of dry dust collector bag cleaning in blast furnaces, and in particular to a dual-mode backflushing cleaning switching mechanism and device for dry dust collector bags in blast furnaces. Background Technology

[0002] The existing dry external filter bag dust removal process for blast furnace gas requires valve assemblies on both the nitrogen and clean gas pipelines to control the flow of dust when using either nitrogen pulse backflushing or clean gas backflushing in parallel. These valves are manually controlled based on the internal pressure of the main gas pipe to switch between the two backflushing modes. This switching method has poor adaptability, making it difficult to achieve adaptive switching between the two backflushing cleaning paths, increasing the user's workload. Furthermore, the switching of cleaning modes is difficult to perform in a timely manner, affecting the cleaning efficiency and quality of the dust collector bags. Therefore, a dual-mode backflushing cleaning switching mechanism for dry blast furnace dust collector bags is proposed.

[0003] Meanwhile, existing dry external filter bag dust removal processes for blast furnace gas mostly use nitrogen pulse backflushing to clean the dust collector bags. This cleaning method achieves cleaning by supersonic airflow vibration of the bags. During the cleaning process, the bags vibrate significantly, making them prone to damage or detachment during prolonged cleaning, affecting their service life and normal use. Therefore, a dual-mode backflushing cleaning device for dry blast furnace dust collector bags is proposed. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of the embodiments of the present invention and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section, as well as in the specification abstract and the title of the invention, to avoid obscuring the purpose of this section, the specification abstract, and the title of the invention. Such simplifications or omissions shall not be used to limit the scope of the invention.

[0005] In view of the problems existing in the above and / or prior art, the present invention is proposed.

[0006] Therefore, the present invention aims to solve the technical problem that existing dual-mode backflushing cleaning devices are difficult to adaptively switch between dual modes.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a dual-mode backflushing cleaning switching mechanism for dry dust collector bags in blast furnaces, comprising a connecting assembly, including a connecting seat, a connecting pipe located at the top of the connecting seat, a nitrogen inlet pipe located at the bottom of the connecting seat, a clean flue gas backflushing pipe located on one side of the connecting seat, and a nitrogen backflushing pipe located on the other side of the connecting seat; and,

[0008] The switching component includes a pressure-resistant component disposed inside the nitrogen inlet pipe, a sealing component disposed on the inner side of the pressure-resistant component, a first linkage component disposed on one side of the pressure-resistant component, a first control component disposed on the outer side of the first linkage component, a second linkage component disposed on the other side of the pressure-resistant component, and a second control component disposed on the outer side of the second linkage component.

[0009] As a preferred embodiment of the dual-mode reverse-flushing cleaning switching mechanism for blast furnace dry dust collector bags described in this invention, the pressure-resistant component includes a pressure-resistant cover disposed inside the nitrogen inlet pipe, a spring is provided at the bottom of the pressure-resistant cover, and a push groove is provided on the inner wall of the pressure-resistant cover.

[0010] The sealing component includes a fixed ring disposed at the top of the inner wall of the nitrogen inlet pipe, a sealing plate disposed on the surface of the fixed ring, a guide post disposed on the surface of the sealing plate, a rotating shaft disposed on the outer edge of the fixed ring, a movable ring disposed on the outer side of the rotating shaft, a guide groove disposed on the surface of the movable ring, and a protrusion disposed on the outer side of the movable ring.

[0011] The first linkage component includes a first toothed rack disposed on the outside of the pressure-resistant cover, and a first toothed ring is connected to the outside of the first toothed rack;

[0012] The first control component includes a first chassis disposed on the inner wall of the clean flue gas backflush pipe, a first guide rail disposed on the surface of the first chassis, a first partition disposed on the outer side of the first guide rail, a first sliding column disposed on the surface of the first partition, a first rotating ring disposed on the outer side of the first partition, and a first sliding groove disposed on the surface of the first rotating ring that cooperates with the first sliding column.

[0013] The second linkage component includes a second rack disposed on the outside of the pressure-resistant cover, and a second toothed ring is connected to the outside of the second rack;

[0014] The second control component includes a second chassis disposed on the inner wall of the nitrogen backflush pipe. The surface of the second chassis is provided with a second guide rail. The outer side of the second guide rail is provided with a second partition. The surface of the second partition is provided with a second sliding column. The outer side of the second partition is provided with a second rotating ring. The surface of the second rotating ring is provided with a second sliding groove that cooperates with the second sliding column.

[0015] As a preferred embodiment of the dual-mode reverse-flushing cleaning switching mechanism for blast furnace dry dust collector bags described in this invention, wherein: the connecting pipe, nitrogen inlet pipe, clean flue gas reverse-flushing pipe and nitrogen reverse-flushing pipe are all connected to the connecting seat.

[0016] As a preferred embodiment of the dual-mode reverse-flushing cleaning switching mechanism for blast furnace dry dust removal bag in this invention, wherein: the pressure-resistant cover is movably embedded in the pipe wall of the nitrogen inlet pipe, and the pressure-resistant cover and the nitrogen inlet pipe form an elastic telescopic structure through a spring;

[0017] The push groove is inclined in a spiral shape along the inner wall of the nitrogen inlet pipe.

[0018] As a preferred embodiment of the dual-mode reverse-flushing cleaning switching mechanism for blast furnace dry dust collector bags described in this invention, wherein: the sealing plate and the fixing ring are rotatably connected, and the sealing plate is arranged in a ring array along the inner edge of the fixing ring;

[0019] The guide post and the guide groove are in a sliding fit, and the guide groove is arc-shaped.

[0020] The sealing plate and the movable ring form a linkage structure through the guide groove.

[0021] As a preferred embodiment of the dual-mode reverse-blowing cleaning switching mechanism for blast furnace dry dust collector bags described in this invention, the movable ring and the pressure-resistant cover form a linkage structure through a push groove, and the protrusion and the push groove are fitted together.

[0022] As a preferred embodiment of the dual-mode reverse-flushing cleaning switching mechanism for blast furnace dry dust collector bags described in this invention, wherein: the first rack and the first toothed ring are meshed, and the first toothed ring is fixed to the first rotating ring.

[0023] As a preferred embodiment of the dual-mode reverse-blowing cleaning switching mechanism for blast furnace dry dust collector bags described in this invention, wherein: the first rotating ring and the clean flue gas reverse-blowing pipe are movably connected, the first rotating ring and the first partition plate form a linkage structure through the first sliding groove, and the first sliding groove is set in a quarter-elliptical arc shape.

[0024] The beneficial effects of this invention are as follows: Through the linkage and cooperation between the anti-pressure component, the sealing component, and the two control components, the switching mechanism can adaptively select the cleaning mode according to the pressure of the spring of the anti-pressure component based on the pressure inside the high-pressure clean gas main pipe. This allows the switching operation of the two modes to be carried out in a timely manner according to the changes in the pressure inside the high-pressure clean gas main pipe, ensuring stable cleaning of the dust collector bag while reducing the user's operation steps and meeting the user's needs.

[0025] In view of the problems existing in the above and / or prior art, a dual-mode reverse-flushing dust removal device for dry dust collectors in blast furnaces is proposed.

[0026] Therefore, the present invention aims to solve the technical problem that existing dust removal devices mostly use nitrogen pulse backflushing technology for dust removal, which affects the service life of dust collector bags.

[0027] To solve the above-mentioned technical problems, the present invention also provides the following technical solution: a dual-mode reverse-flushing cleaning switching mechanism for dry dust collector bags in blast furnaces as described in any one of the claims; and a dust removal assembly, including a dust collector bag;

[0028] A clean coal gas cleaning assembly includes a raw coal gas branch pipe connected to the dust collector bag. The assembly also includes a clean coal gas branch pipe and a coal gas pressure relief pipe connected to the upper part of the dust collector assembly. The clean coal gas branch pipe is connected to the connecting assembly. A high-pressure clean coal gas main pipe is connected to the outside of the clean coal gas branch pipe. A low-pressure clean coal gas main pipe is connected to the outside of the high-pressure clean coal gas main pipe. A coal gas pressure regulating valve assembly is installed between the high-pressure and low-pressure clean coal gas main pipes. A blast furnace gas residual pressure power generation component is also installed between the high-pressure and low-pressure clean coal gas main pipes.

[0029] The nitrogen backflushing assembly includes a nitrogen outlet pipe connected to the clean coal gas branch pipe, and the inlet end of the nitrogen outlet pipe is connected to a nitrogen storage tank.

[0030] The nitrogen outlet pipe is also equipped with a nitrogen blind valve and a nitrogen quick-opening valve to control the gas flow.

[0031] The nitrogen storage tank is connected to an inlet pipe at its inlet end, and the inlet pipe is equipped with a nitrogen shut-off valve and a nitrogen pressure regulating valve to control the gas flow.

[0032] As a preferred embodiment of the dual-mode reverse-flushing cleaning device for dry dust removal bags in blast furnaces according to the present invention, wherein: a first gas butterfly valve and a first gas blind valve are provided on the raw coal gas branch pipe;

[0033] The clean gas branch pipe is equipped with a second gas butterfly valve and a second gas blind plate valve.

[0034] The clean gas from the high-pressure clean gas main is sent to the low-pressure clean gas main after being depressurized by the gas pressure regulating valve group or the blast furnace gas residual pressure power generation component.

[0035] The gas depressurization pipe is equipped with a third gas blind valve and a gas pressure relief valve. The clean gas from the gas depressurization pipe is sent to the clean gas main pipe through the gas depressurization recovery pipe.

[0036] The beneficial effects of this invention are as follows: By employing both nitrogen backflushing and clean coal gas countercurrent cleaning modes to clean the dust collector bags, the cleaning effect of the device on the dust collector bags is guaranteed. At the same time, compared with the nitrogen pulse backflushing technology used in traditional cleaning devices, the nitrogen backflushing technology can effectively avoid the problem of dust collector bags being damaged by vibration due to nitrogen pulse action, thus extending the service life of the dust collector bags and ensuring the normal operation of the dust collector bags. Attached Figure Description

[0037] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0038] Figure 1 A schematic diagram of the overall structure of the dual-mode reverse-flushing cleaning switching mechanism for blast furnace dry dust collector bags according to an embodiment of the present invention is provided.

[0039] Figure 2 A cross-sectional structural schematic diagram of the dual-mode reverse-flushing cleaning switching mechanism for blast furnace dry dust collector bags according to an embodiment of the present invention;

[0040] Figure 3 An exploded structural diagram of the pressure-resistant component and nitrogen backflushing pipe in a dual-mode reverse-flushing cleaning switching mechanism for dry dust removal bags in a blast furnace, as provided in an embodiment of the present invention;

[0041] Figure 4 An exploded structural diagram of the sealing component in the dual-mode reverse-flushing cleaning switching mechanism of the blast furnace dry dust collector bag as described in one embodiment of the present invention;

[0042] Figure 5 An exploded structural diagram of the first linkage component and the first control component in the dual-mode backflushing cleaning switching mechanism for blast furnace dry dust removal bag as described in an embodiment of the present invention;

[0043] Figure 6 An exploded structural diagram of the second linkage component and the second control component in the dual-mode backflushing cleaning switching mechanism for blast furnace dry dust removal bag as described in an embodiment of the present invention;

[0044] Figure 7 This is a system diagram of a dual-mode reverse-flushing cleaning switching mechanism and device for blast furnace dry dust collector bags, as provided in one embodiment of the present invention. Detailed Implementation

[0045] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0046] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0047] Secondly, the present invention will be described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure will be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0048] Furthermore, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that mutually excludes other embodiments.

[0049] Example 1

[0050] Reference Figure 1-6 This embodiment provides a dual-mode backflushing cleaning switching mechanism for dry dust collector bags used in blast furnaces.

[0051] The dual-mode reverse-blowing cleaning switching mechanism and device for dry dust collector bags in blast furnaces includes a connecting component 100 and a switching component 200.

[0052] Specifically, the connecting component 100 includes a connecting seat 101 that is open on all four sides and is hollow. The top opening of the connecting seat 101 is connected to a connecting pipe 102. The connecting seat 101 is connected to a nitrogen inlet pipe 103 through its bottom opening. At the same time, a clean flue gas backflush pipe 104 is connected to one side opening of the connecting seat 101, and a nitrogen backflush pipe 105 is connected to the other side opening.

[0053] The switching assembly 200 includes a pressure-resistant component 201 movably embedded inside the nitrogen inlet pipe 103. A sealing component 202 is movably disposed on the inner side of the pressure-resistant component 201. Meanwhile, a first linkage component 203 and a second linkage component 205 are respectively installed on the outer side of the pressure-resistant component 201. A first control component 204 is disposed on the outer side of the first linkage component 203 and is located at the inlet of the clean flue gas backflush pipe 104. A second control component 206 is disposed on the outer side of the second linkage component 205 and is located at the inlet of the nitrogen backflush pipe 105.

[0054] Furthermore, the pressure-resistant component 201 includes a pressure-resistant cover 201a disposed inside the nitrogen inlet pipe 103. A cavity is provided at the port of the nitrogen inlet pipe 103 for the pressure-resistant cover 201a to be embedded in. The cavity of the nitrogen inlet pipe 103 also has protruding ribs for limiting and guiding the pressure-resistant cover 201a, ensuring stable vertical movement of the pressure-resistant cover 201a and preventing it from rotating and affecting its subsequent function on the sealing component 202. The lower end of 201a is located inside the nitrogen inlet pipe 103. At the same time, a spring 201b is provided at the bottom of the pressure shield 201a. The spring 201b is located between the pressure shield 201a and the nitrogen inlet pipe 103 and can provide elastic support for the pressure shield 201a to meet the subsequent elastic lifting and lowering needs of the pressure shield 201a. In addition, a push groove 201c is provided on the inner wall of the pressure shield 201a. The push groove 201c is inclined in a spiral shape along the inner wall of the nitrogen inlet pipe 103.

[0055] The sealing component 202 includes a fixed ring 202a fixedly installed on the top of the inner wall of the nitrogen inlet pipe 103. Multiple sealing pieces 202b are arranged in a ring array along the inner edge of the surface of the fixed ring 202a. The sealing pieces 202b are rotatably connected to the fixed ring 202a. A guide post 202c is also integrally fixedly installed on the surface of the sealing piece 202b. A rotating shaft 202d is fixedly embedded in the concave part of the outer edge of the fixed ring 202a. A movable ring 202e is coaxially connected to the inner side of the rotating shaft 202d. An arc-shaped guide groove 202f that cooperates with the guide post 202c is opened on the surface of the movable ring 202e. A protrusion 202g is also integrally installed on the outer side of the movable ring 202e.

[0056] The first linkage 203 includes a first rack 203a fixed to the outside of the pressure-resistant cover 201a by a connecting rod, and a first toothed ring 203b meshes with the outside of the first rack 203a.

[0057] The first control component 204 includes a first chassis 204a fixedly disposed on the inner wall of the clean flue gas backflush pipe 104. Two horizontal first guide rails 204b are symmetrically disposed on the surface of the first chassis 204a. Two first partitions 204c that can move horizontally along the first guide rails 204b are symmetrically disposed between the two first guide rails 204b. A first sliding column 204d is integrally disposed on the outer edge of the surface of the first partition 204c. A first rotating ring 204e that can be rotatably connected to the inner wall of the clean flue gas backflush pipe 104 is disposed on the outer side of the first partition 204c. A first sliding groove 204f that cooperates with the first sliding column 204d is opened on the surface of the first rotating ring 204e. A first toothed ring 203b is coaxially fixedly disposed on the surface of the first rotating ring 204e.

[0058] The second linkage 205 includes a second rack 205a that is diagonally arranged with the first rack 203a and fixed to the pressure cover 201a. At the same time, a second toothed ring 205b is also engaged on the outer side of the second rack 205a.

[0059] The second control component 206 includes a second chassis 206a disposed on the inner wall of the nitrogen backflush pipe 105. A second guide rail 206b is disposed on the surface of the second chassis 206a. A second partition 206c is disposed on the outer side of the second guide rail 206b. A second sliding column 206d is disposed on the surface of the second partition 206c. A second rotating ring 206e is disposed on the outer side of the second partition 206c. A second sliding groove 206f that cooperates with the second sliding column 206d is formed on the surface of the second rotating ring 206e.

[0060] Furthermore, the connecting pipe 102, nitrogen inlet pipe 103, clean flue gas backflush pipe 104, and nitrogen backflush pipe 105 are all connected to the connecting seat 101, that is, both clean flue gas and nitrogen can enter the dust collector bag through the connecting seat 101 via the clean flue gas backflush pipe 104 and the nitrogen backflush pipe 105 respectively to achieve backflush cleaning of the dust collector bag.

[0061] The clean gas pressure can be directly applied to the top of the pressure shield 201a. At the same time, the spring 201b and the lower end of the pressure shield 201a are both embedded in the nitrogen inlet pipe 103. The spring 201b provides elastic support for the pressure shield 201a. The spring 201b can balance the clean gas pressure of the dry dust removal system during production. When the clean gas pressure is ≥100kPa, the top of the pressure shield 201a is compressed by the pressure, so that the spring 201b is in a fully compressed state and the pressure shield 201a is at its lowest point. When the clean gas pressure is <100kPa, the elastic force of the spring 201b can cancel out the gas pressure, and the elastic force of the spring 201b pushes the pressure shield 201a up to realize the on / off control of the nitrogen inlet pipe 103 and the clean flue gas backflush pipe 104.

[0062] The protrusion 202g is movably embedded in the push groove 201c. Since the push groove 201c is spirally inclined in a clockwise direction, when the push groove 201c moves upward with the pressure cover 201a, it can drive the protrusion 202g to move along its interior, thereby realizing the counterclockwise rotation of the movable ring 202e.

[0063] Multiple sealing pieces 202b are arranged in an arc-shaped array inside the fixed ring 202a, and can be spliced ​​to form a complete circular surface to seal the inner ring of the fixed ring 202a. The guide post 202c on the surface of the sealing piece 202b is embedded in the arc-shaped guide groove 202f on the surface of the movable ring 202e. When the movable ring 202e rotates, the guide post 202c can slide inside the guide groove 202f as it rotates. Through the hinged engagement between one end of the sealing piece 202b and the fixed ring 202a, the multiple sealing pieces 202b can be linked with the movable ring 202e. That is, the multiple sealing pieces 202b can rotate inward and outward as the movable ring 202e rotates, thereby controlling the opening and closing of the hollow core of the fixed ring 202a.

[0064] The first rack 203a and the first toothed ring 203b, and the second rack 205a and the second toothed ring 205b are all meshed. When the first rack 203a and the second rack 205a move up and down with the pressure cover 201a, they can synchronously drive the first toothed ring 203b and the second toothed ring 205b to rotate counterclockwise, thereby realizing synchronous control of the rotation of the first rotating ring 204e and the second rotating ring 206e.

[0065] Meanwhile, the surfaces of the first rotating ring 204e and the second rotating ring 206e are respectively arranged in a ring with two sets of first sliding grooves 204f and second sliding grooves 206f in opposite directions. Both the first sliding grooves 204f and the second sliding grooves 206f are set in a quarter-elliptical arc. That is, during the rotation of the two rotating rings, through the cooperation between each sliding groove and the sliding column, the rotation of the rotating rings can drive the corresponding two partitions under the guide rail limit to move horizontally towards each other. The opening and closing control of the corresponding chassis center is achieved by the contact and separation of the two partitions. At the same time, since the first control component 204 is in the open state and the second control component 206 is in the closed state at the beginning, and the two rotating rings rotate in the same direction under the cooperation between the rack and the toothed ring, the first control component 204 and the second control component 206 can be opened and closed alternately with the rise and fall of the rack to meet the dust removal needs of the dust collector bag in different states.

[0066] In specific operation, the connecting pipe 102 is connected to the high-pressure clean gas main pipe in the dry dust removal device, and the nitrogen inlet pipe 103 is connected to the nitrogen storage tank. Simultaneously, the clean flue gas backflush pipe 104 and the nitrogen backflush pipe 105 are connected to the dust collector bags that need cleaning via clean gas branch pipes. When the clean gas pressure in the high-pressure clean gas main pipe is ≥100 kPa, the spring 201b is in a fully compressed state, and the pressure-resistant cover 201a is at its lowest point. The sealing component 202 at the nitrogen inlet pipe 103 and the second control component 206 at the nitrogen backflush pipe 105 are both in the closed state, while the first control component 204 at the clean flue gas backflush pipe 104 is in the open state. At this time, the high-pressure clean coal gas flows back to the dust collector bag through the connecting pipe 102 and the clean flue gas backflush pipe 104. The dust collected on the dust collector bag falls off under the action of the coal gas flow. At this time, the clean flue gas backflush cleaning operation of the dust collector bag is completed.

[0067] When the pressure of the clean gas in the high-pressure clean gas main pipe is less than 100 kPa, the pressure of the clean gas is less than the elastic force of the spring 201b. That is, the pressure-resistant cover 201a can move upward under the elastic force of the spring 201b. Under the sliding cooperation of the inclined threaded push groove 201c and the outer protrusion 202g of the movable ring 202e, the pressure-resistant cover 201a rises while pushing the movable ring 202e to rotate counterclockwise. This causes multiple sealing pieces 202b to rotate outward around their hinge point under the push of the guide groove 202f on the guide post 202c, so that the center of the fixed ring 202a is in the open state. The nitrogen in the nitrogen inlet pipe 103 can then enter the connecting seat 101. When the pressure-resistant cover 201a rises, the first rack 203a and the second rack 205a, which are diagonally arranged on both sides, can simultaneously pass through the first toothed ring 203b and the second toothed ring 205b respectively. The first rotating ring 204e and the second rotating ring 206e are driven to rotate counterclockwise synchronously, which causes the first partition 204c located outside the first rotating ring 204e to move inward and towards each other, closing the first chassis 204a. At the same time, the second partition 206c located outside the second rotating ring 206e moves outward and towards each other, opening the second chassis 206a. That is, by moving the pressure cover 201a upward, the first control component 204 can be closed and the second control component 206 can be opened. Then, the nitrogen in the nitrogen inlet pipe 103 can enter the dust collector bag through the nitrogen backflush pipe 105 for dust removal and cleaning. Through the linkage between the pressure-resistant component 201, the sealing component 202 and the two control components, the switching mechanism can adaptively select the cleaning mode according to the internal pressure of the high-pressure clean gas main pipe, ensuring stable cleaning of the dust collector bag while reducing the user's operation steps and meeting the user's needs.

[0068] Example 2

[0069] Reference Figure 7This is the second embodiment of the present invention, which is based on the previous embodiment and differs from the previous embodiment in that:

[0070] This embodiment provides a dual-mode reverse-blowing cleaning device for dry dust removal bags in blast furnaces.

[0071] The dual-mode reverse-flushing cleaning device for dry dust removal bags in blast furnaces includes a dust removal component 300, a clean gas cleaning component 400, and a nitrogen reverse-flushing component 500.

[0072] Specifically, the dust removal assembly 300 includes a dust removal bag 301 for cleaning and removing dust from the coal gas;

[0073] The clean coal gas cleaning assembly 400 includes a raw coal gas branch pipe 401 connected to the dust collector bag 301. The raw coal gas branch pipe 401 is equipped with a first coal gas butterfly valve 401a and a first coal gas blind valve 401b. The clean coal gas cleaning assembly 400 also includes a clean coal gas branch pipe 402 and a coal gas pressure relief pipe 403 connected to the upper part of the dust collector assembly 300. The clean coal gas branch pipe 402 is connected to the connecting assembly 100, and a second coal gas butterfly valve is provided on the clean coal gas branch pipe 402. 402a and the second gas blind valve 402b, the outside of the clean gas branch pipe 402 is also connected to a high-pressure clean gas main pipe 404, the outside of the high-pressure clean gas main pipe 404 is connected to a low-pressure clean gas main pipe 405, a gas pressure regulating valve group 406 is installed between the high-pressure clean gas main pipe 404 and the low-pressure clean gas main pipe 405, and a blast furnace gas residual pressure power generation component 407 is also installed between the high-pressure clean gas main pipe 404 and the low-pressure clean gas main pipe 405; and...

[0074] The nitrogen backflushing assembly 500 includes a nitrogen outlet pipe 501 connected to a clean coal gas branch pipe 402. The inlet end of the nitrogen outlet pipe 501 is connected to a nitrogen storage tank 502. The nitrogen outlet pipe 501 is also equipped with a nitrogen blind valve 503 and a nitrogen quick-opening valve 504 for controlling the gas flow. The inlet end of the nitrogen storage tank 502 is connected to a nitrogen inlet pipe 505. The nitrogen inlet pipe 505 is equipped with a nitrogen shut-off valve 506 and a nitrogen pressure regulating valve 507 for controlling the gas flow.

[0075] Furthermore, the clean gas from the high-pressure clean gas main 404 is depressurized by the gas pressure regulating valve group 406 or the blast furnace gas residual pressure power generation component 407 and then sent to the low-pressure clean gas main 405.

[0076] The gas depressurization pipe 403 is also equipped with a third gas blind plate valve 403a and a gas pressure relief valve 403b. The clean gas from the gas depressurization pipe 403 is sent to the clean gas main pipe 405 via the gas pressure relief valve 403b and the gas depressurization recovery pipe 403c.

[0077] When dust removal is required, the dust removal component 300 must first stop filtering. Therefore, the first gas butterfly valve 401a and the second gas butterfly valve 402a in the inlet and outlet of the dust removal component 300 are closed. The first gas blind valve 401b, the second gas blind valve 402b, the third gas blind valve 403a and the nitrogen blind valve 503 are all normally open during dust removal mode production.

[0078] Furthermore, the dust removal component 300 is depressurized, and the clean gas from the high-pressure clean gas main pipe 404 is depressurized through the gas pressure regulating valve group 406 or the blast furnace gas residual pressure power generation component 407 and then sent to the low-pressure clean gas main pipe 405. At the same time, the gas depressurization valve 403b is opened, and the gas in the dust removal component 300 is recovered to the low-pressure clean gas main pipe 405 through the gas depressurization recovery pipe 403c. After the gas pressure in the dust removal component 300 is ≤40kPa, the gas depressurization valve 403b is closed.

[0079] After the dust removal component 300 is depressurized, the dust removal operation begins. When the gas pressure in the high-pressure clean gas main pipe 404 is detected to be <100kPa, the nitrogen backflushing mode is activated.

[0080] The nitrogen backflushing assembly 500 includes a nitrogen outlet pipe 501 connected to a clean coal gas branch pipe 402. The inlet end of the nitrogen outlet pipe 501 is connected to a nitrogen storage tank 502. The nitrogen outlet pipe 501 is also equipped with a nitrogen blind valve 503 and a nitrogen quick-opening valve 504 for controlling the gas flow.

[0081] Specifically, the nitrogen storage tank 502 is connected to a nitrogen inlet pipe 505 at its inlet end. The nitrogen inlet pipe 505 is equipped with a nitrogen shut-off valve 506 and a nitrogen pressure regulating valve 507 to control the gas flow.

[0082] Therefore, when the nitrogen backflushing mode is activated, the nitrogen shut-off valve 506 is opened. At this time, the nitrogen pressure regulating valve 507 is adjusted to output nitrogen pressure of 0.1MPa~0.3MPa. The nitrogen quick-opening valve 504 is opened, and the nitrogen in the nitrogen storage tank 502 enters the clean air chamber of the dust removal component 300 through the nitrogen outlet pipe 501 and the clean gas branch pipe 402. Then, it enters the dust chamber of the dust removal component 300 through the dust removal bag 301. The dust collected on the dust removal bag 301 falls off under the action of the nitrogen flow, completing the cleaning of the dust removal bag 301. The nitrogen quick-opening valve 504 is closed, and the second gas butterfly valve 402a and the first gas butterfly valve 401a are opened, and the dust removal component 300 resumes filtration.

[0083] Specifically, as filtration continues, dust accumulates and ash builds up, increasing filtration resistance. At this point, dust removal is necessary. Dry dust collector bag cleaning for blast furnace gas includes:

[0084] (1) Steps for constructing a bag filter dust removal system: The clean gas branch pipe 402 at the top of the dust removal component 300 is connected to the nitrogen storage tank 502 through the nitrogen outlet pipe 501. The nitrogen outlet pipe 501 is equipped with a nitrogen blind valve 503 and a nitrogen quick-opening valve 504 to control the gas flow. The nitrogen storage tank 502 is connected to a nitrogen inlet pipe 505. The nitrogen inlet pipe 505 is equipped with a nitrogen shut-off valve 506 to control the gas flow and a nitrogen pressure regulating valve 507 to control the output pressure.

[0085] (2) Bag cleaning strategy: Follow the steps below:

[0086] 1) Stop the filter in the housing: Close the first gas butterfly valve 401a and the second gas butterfly valve 402a at the inlet and outlet of the dust removal component 300. The first gas blind valve 401b, the second gas blind valve 402b, the third gas blind valve 403a and the nitrogen blind valve 503 are all normally open during the production of the dust removal system.

[0087] 2) Depressurization of the housing: Open the gas depressurization valve 403b, and the gas in the dust removal component 300 will be recovered to the low-pressure clean gas main pipe 405 through the gas depressurization recovery pipe 403c. After the gas pressure in the dust removal component 300 is ≤40kPa, close the gas depressurization valve 403b.

[0088] 3) Baghouse cleaning: Includes two modes: clean gas cleaning mode and nitrogen backflushing mode.

[0089] Clean gas cleaning mode: When the gas pressure of the high-pressure clean gas main pipe 404 is detected to be ≥100kPa, the second gas butterfly valve 402a is opened. The high-pressure clean gas flows back to the clean gas chamber of the dust removal component 300 through the clean gas branch pipe 402, and then enters the dust chamber of the dust removal component 300 through the dust removal bag 301. The dust collected on the dust removal bag 301 falls off under the action of the gas flow, completing the cleaning of the dust removal bag 301. After opening the first gas butterfly valve 401a, the box resumes filtration.

[0090] Nitrogen backflushing mode: When the gas pressure of the high-pressure clean gas main pipe 404 is detected to be <100kPa, the nitrogen shut-off valve 506 is opened, the nitrogen pressure regulating valve 507 is adjusted to output nitrogen pressure of 0.1MPa~0.3MPa, the nitrogen quick-opening valve 504 is opened, and the nitrogen in the nitrogen storage tank 502 enters the clean gas chamber of the dust removal component 300 through the nitrogen outlet pipe 501 and the clean gas branch pipe 402, and then enters the dust chamber of the dust removal component 300 through the dust removal bag 301. The dust collected on the dust removal bag 301 falls off under the action of nitrogen flow, completing the cleaning of the dust removal bag 301. The nitrogen quick-opening valve 504 is closed, the second gas butterfly valve 402a and the first gas butterfly valve 401a are opened, and the box resumes filtration.

[0091] When dust accumulates to a certain amount, after testing, the ash discharge valve is activated to transport the dust from the dust collection component 300 to the outside, and then periodically transport it out of the factory area. This cycle repeats, ensuring that the device operates normally and can work steadily.

[0092] Example 3

[0093] Reference Figure 1-7 This is the third embodiment of the present invention, which is based on the previous embodiment and differs from the previous embodiment in that:

[0094] This embodiment provides a dual-mode backflushing cleaning switching mechanism and device for dry dust collector bags in blast furnaces. Combining Embodiment 1 and Embodiment 2, it includes a connecting component 100, a switching component 200, a dust removal component 300, a clean gas cleaning component 400, and a nitrogen backflushing component 500.

[0095] Specifically, the clean gas cleaning assembly 400 includes a raw gas branch pipe 401 connected to the dust collector bag 301. The raw gas branch pipe 401 is equipped with a first gas butterfly valve 401a and a first gas blind valve 401b. The clean gas cleaning assembly 400 also includes a clean gas branch pipe 402 and a gas pressure relief pipe 403 connected to the upper part of the dust collector assembly 300. The clean gas branch pipe 402 is connected to the connecting assembly 100. The outside of the clean gas branch pipe 402 is also connected to a high-pressure clean gas main pipe 404. The outside of the high-pressure clean gas main pipe 404 is connected to a low-pressure clean gas main pipe 405. A gas pressure regulating valve group 406 is provided between the high-pressure clean gas main pipe 404 and the low-pressure clean gas main pipe 405. A blast furnace gas residual pressure power generation component 407 is also provided between the high-pressure clean gas main pipe 404 and the low-pressure clean gas main pipe 405.

[0096] The nitrogen backflushing assembly 500 includes a nitrogen outlet pipe 501 connected to a clean coal gas branch pipe 402 via a nitrogen backflushing pipe 105. The inlet end of the nitrogen outlet pipe 501 is connected to a nitrogen storage tank 502, and the inlet end of the nitrogen storage tank 502 is connected to a nitrogen inlet pipe 505. The nitrogen inlet pipe 505 is equipped with a nitrogen shut-off valve 506 and a nitrogen pressure regulating valve 507 for controlling the gas flow (i.e., the difference between this embodiment and embodiment two is that the clean coal gas branch pipe 402 and the nitrogen outlet pipe 501 are not equipped with valves for controlling the flow of the pipeline to achieve mode switching).

[0097] Furthermore, before the ash removal operation, the connecting pipe 102 is connected to the high-pressure clean gas main pipe 404, the nitrogen inlet pipe 103 is connected to the nitrogen outlet pipe 501, and the clean flue gas backflush pipe 104 and the nitrogen backflush pipe 105 are connected to the clean gas branch pipe 402. The remaining operation steps are the same as in Example 1 and Example 2.

[0098] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0099] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the currently considered best mode for carrying out the invention, or those features that are not relevant to implementing the invention) may be omitted.

[0100] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0101] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A dual-mode reverse-flushing cleaning switching mechanism for dry dust collector bags in blast furnaces, characterized in that: include, The communication assembly (100) includes a communication seat (101), a communication pipe (102) located at the top of the communication seat (101), a nitrogen inlet pipe (103) located at the bottom of the communication seat (101), a clean flue gas backflush pipe (104) located on one side of the communication seat (101), and a nitrogen backflush pipe (105) located on the other side of the communication seat (101); and, The switching component (200) includes a pressure-resistant component (201) disposed inside the nitrogen inlet pipe (103). A sealing component (202) is disposed on the inner side of the pressure-resistant component (201). A first linkage component (203) is disposed on one side of the pressure-resistant component (201). A first control component (204) is disposed on the outer side of the first linkage component (203). A second linkage component (205) is disposed on the other side of the pressure-resistant component (201). A second control component (206) is disposed on the outer side of the second linkage component (205). The pressure-resistant component (201) includes a pressure-resistant cover (201a) disposed inside the nitrogen inlet pipe (103), a spring (201b) is provided at the bottom of the pressure-resistant cover (201a), and a push groove (201c) is provided on the inner wall of the pressure-resistant cover (201a). The sealing component (202) includes a fixed ring (202a) disposed on the top of the inner wall of the nitrogen inlet pipe (103), a sealing piece (202b) disposed on the surface of the fixed ring (202a), a guide post (202c) disposed on the surface of the sealing piece (202b), a rotating shaft (202d) disposed on the outer edge of the fixed ring (202a), a movable ring (202e) disposed on the outer side of the rotating shaft (202d), a guide groove (202f) disposed on the surface of the movable ring (202e), and a protrusion (202g) disposed on the outer side of the movable ring (202e). The first linkage (203) includes a first rack (203a) disposed on the outside of the pressure shield (201a), and a first toothed ring (203b) is connected to the outside of the first rack (203a). The first control component (204) includes a first chassis (204a) disposed on the inner wall of the clean flue gas backflush pipe (104), a first guide rail (204b) disposed on the surface of the first chassis (204a), a first partition (204c) disposed on the outer side of the first guide rail (204b), a first sliding column (204d) disposed on the surface of the first partition (204c), a first rotating ring (204e) disposed on the outer side of the first partition (204c), and a first sliding groove (204f) formed on the surface of the first rotating ring (204e) that cooperates with the first sliding column (204d). The second linkage (205) includes a second rack (205a) disposed on the outside of the pressure shield (201a), and a second toothed ring (205b) is connected to the outside of the second rack (205a). The second control component (206) includes a second chassis (206a) disposed on the inner wall of the nitrogen backflush pipe (105). A second guide rail (206b) is disposed on the surface of the second chassis (206a). A second partition (206c) is disposed on the outer side of the second guide rail (206b). A second sliding column (206d) is disposed on the surface of the second partition (206c). A second rotating ring (206e) is disposed on the outer side of the second partition (206c). A second sliding groove (206f) is formed on the surface of the second rotating ring (206e) to cooperate with the second sliding column (206d). The pressure shield (201a) is movably embedded in the wall of the nitrogen inlet pipe (103), and the pressure shield (201a) and the nitrogen inlet pipe (103) form an elastic telescopic structure through a spring (201b). The sealing plate (202b) and the fixed ring (202a) are rotatably connected, the guide post (202c) and the guide groove (202f) are slidably fitted, and the sealing plate (202b) and the movable ring (202e) form a linkage structure through the guide groove (202f). The movable ring (202e) and the pressure-resistant cover (201a) form a linkage structure through the push groove (201c), and the protrusion (202g) and the push groove (201c) are fitted together. The first rotating ring (204e) and the second rotating ring (206e) rotate in the same direction under the cooperation between the rack and the ring, thereby causing the first control element (204) and the second control element (206) to open and close alternately as the rack rises and falls.

2. The dual-mode reverse-flushing cleaning switching mechanism for blast furnace dry dust collector bags according to claim 1, characterized in that: The connecting pipe (102), nitrogen inlet pipe (103), clean flue gas backflush pipe (104) and nitrogen backflush pipe (105) are all connected to the connecting seat (101).

3. The dual-mode reverse-flushing cleaning switching mechanism for blast furnace dry dust collector bags according to claim 1, characterized in that: The push groove (201c) is inclined in a spiral shape along the inner wall of the nitrogen inlet pipe (103).

4. The dual-mode reverse-flushing cleaning switching mechanism for blast furnace dry dust collector bags according to claim 3, characterized in that: The sealing pieces (202b) are arranged in a ring array along the inner edge of the fixing ring (202a); The guide groove (202f) is arc-shaped.

5. The dual-mode reverse-flushing cleaning switching mechanism for blast furnace dry dust collector bags according to claim 1, characterized in that: The first rack (203a) and the first toothed ring (203b) are meshed together, and the first toothed ring (203b) is fixed to the first rotating ring (204e).

6. The dual-mode reverse-flushing cleaning switching mechanism for blast furnace dry dust collector bags according to claim 5, characterized in that: The first rotating ring (204e) is movably connected to the clean flue gas backflush pipe (104). The first rotating ring (204e) and the first partition (204c) form a linkage structure through the first sliding groove (204f). The first sliding groove (204f) is set in a quarter-elliptical arc shape.

7. A dual-mode reverse-flushing dust removal device for dry dust collectors in blast furnaces, characterized in that: Including a dual-mode reverse-flushing cleaning switching mechanism for blast furnace dry dust collector bags as described in any one of claims 1 to 6; and, Dust collection assembly (300), including dust collection bag (301); A clean gas cleaning assembly (400) includes a raw gas branch pipe (401) connected to the dust collector bag (301). The clean gas cleaning assembly (400) also includes a clean gas branch pipe (402) and a gas depressurization pipe (403) connected to the upper part of the dust collector assembly (300). The clean gas branch pipe (402) is connected to the connecting assembly (100). A high-pressure clean gas main pipe (404) is also connected to the outside of the clean gas branch pipe (402). A low-pressure clean gas main pipe (405) is connected to the outside of the high-pressure clean gas main pipe (404). A gas pressure regulating valve group (406) is provided between the high-pressure clean gas main pipe (404) and the low-pressure clean gas main pipe (405). A blast furnace gas residual pressure power generation component (407) is also provided between the high-pressure clean gas main pipe (404) and the low-pressure clean gas main pipe (405). The nitrogen backflushing assembly (500) includes a nitrogen outlet pipe (501) connected to the clean coal gas branch pipe (402), and the inlet end of the nitrogen outlet pipe (501) is connected to a nitrogen storage tank (502). The nitrogen outlet pipe (501) is also equipped with a nitrogen blind valve (503) and a nitrogen quick-opening valve (504) for controlling the gas flow. The nitrogen storage tank (502) is connected to an inlet pipe (505) at its inlet end. The inlet pipe (505) is equipped with a nitrogen shut-off valve (506) and a nitrogen pressure regulating valve (507) for controlling the gas flow. The connecting pipe (102) is connected to the high-pressure clean gas main pipe (404), the nitrogen inlet pipe (103) is connected to the nitrogen outlet pipe (501), and the clean flue gas backflush pipe (104) and the nitrogen backflush pipe (105) are connected to the clean gas branch pipe (402).

8. The dual-mode reverse-flushing dust removal device for blast furnace dry dust collectors according to claim 7, characterized in that: The raw coal gas branch pipe (401) is equipped with a first coal gas butterfly valve (401a) and a first coal gas blind plate valve (401b). The clean gas branch pipe (402) is equipped with a second gas butterfly valve (402a) and a second gas blind valve (402b). The clean gas from the high-pressure clean gas main (404) is depressurized by the gas pressure regulating valve group (406) or the blast furnace gas residual pressure power generation component (407) and then sent to the low-pressure clean gas main (405). The gas depressurization pipe (403) is equipped with a third gas blind plate valve (403a) and a gas pressure relief valve (403b). The clean gas from the gas depressurization pipe (403) is sent to the clean gas main pipe (405) via the gas depressurization recovery pipe (403c).

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