Pulverized coal bunker explosion suppression and dust recovery treatment coupling device and method

Abstract

The invention relates to the technical field of dust recovery, in particular to a pulverized coal bunker explosion suppression and dust recovery treatment coupling device and method. The filter bag cleaning device comprises a box body, a filter bag assembly is arranged in an inner cavity of the box body, the surface of the filter bag assembly is slidably sleeved with a cleaning assembly, the cleaning assembly comprises a two-way annular scraper blade matched with the axial section contour of the filter bag assembly, and the two-way annular scraper blade axially reciprocates along the surface of the filter bag assembly. And the outer edge is in contact with the outer surface of the filter bag assembly. The bidirectional annular scraping plate is slidably attached to the surface of the filter bag, the conical structure at the bottom of the bidirectional annular scraping plate scrapes the surface of the filter bag and scrapes accumulated dust when moving downwards, and compared with a traditional impact dust removal mode, the design avoids instant flying of a large amount of dust caused by strenuous vibration, the dust cloud concentration in the dust remover is effectively reduced, and the dust removal efficiency is improved. And meanwhile, mechanical abrasion is greatly reduced through flexible contact, and the service life of the filter bag is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of dust recovery, and in particular to a device and method for coupling explosion suppression and dust recovery processing in a pulverized coal silo. Background Art

[0002] As a typical combustible dust, coal powder has extremely small particle size and significantly increased specific surface area, which can easily form high-concentration and explosive dust clouds in the air. When the concentration of suspended coal powder reaches or exceeds the lower explosion limit, and there is an ignition source in the environment (such as static sparks, mechanical friction heat, welding flames, electrical short circuits or high-temperature surfaces, etc.), it may quickly trigger a violent explosion chain reaction, instantly releasing high-temperature and high-pressure shock waves and flames, causing equipment damage, structural collapse and serious casualties, while triggering secondary disasters such as fire or toxic gas release, posing a huge threat to industrial production safety and environmental stability. In the industrial dust control system, bag dust collectors have become the core equipment for coal powder dust separation due to their high-efficiency filtration performance, structural adaptability and low maintenance costs. Through the physical interception mechanism of multi-layer fabric filter bags, tiny coal powder particles in the dust-laden gas are efficiently captured and settled, effectively reducing the dust concentration to a safe level, thereby preventing explosion risks and ensuring the continuity and reliability of the production process.

[0003] When the dust-laden air flows through the filter bag, the dust particles are intercepted by screening and inertial collision. As the filtration continues, the trapped particles will gradually adhere to and accumulate on the surface of the filter bag. In particular, when the coal dust and other particles absorb moisture in the air, their viscosity is significantly enhanced. During the hours to days of continuous filtration, a large number of particles adhere to and stack with each other, eventually forming a dense and hard filter cake layer on the surface of the filter bag. For example, the Chinese patent publication number CN118649481A discloses a bag-filter with an active cleaning function. By setting an adaptive speed regulation structure, the speed of the dust cleaning plate moving back and forth can be adaptively adjusted according to the amount of air output. When the air output is small, the speed of the dust cleaning plate moving back and forth is faster, and the impact force of the dust cleaning plate on the filter bag is greater. The more dust on the filter bag, the greater the impact force, thereby ensuring the cleaning effect of the filter bag and thus ensuring the efficiency of the dust-laden air filtering by the bag-filtering device.

[0004] Although the above-mentioned equipment can effectively remove the accumulated dust on the surface of the filter bag through the impact of the cleaning plate, it will cause a large number of coal powder particles to be instantly raised, forming a high-concentration dust cloud inside the dust collector. When the raised dust accumulates in a local area, it is very easy to reach or even exceed the explosion concentration threshold. At the same time, the mechanical friction and vibration generated by the cleaning plate hitting the filter bag, and the mutual collision between dust particles may generate static electricity or sparks. Once the ignition source and the combustible dust cloud exist at the same time, it will directly cause an explosion, seriously threatening the safety of the equipment and the life and health of the operator, making it difficult to ensure the safe installation and stable operation of the equipment in the coal powder dust removal scenario. Summary of the Invention

[0005] The object of the present invention is to provide a device and method for coupling explosion suppression and dust recovery in a pulverized coal silo, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above objectives, one of the objectives of the present invention is to provide a coupled device for explosion suppression and dust recovery in a pulverized coal silo, comprising a housing body, a filter bag assembly disposed within the interior of the housing body, a cleaning assembly slidingly sleeved on the surface of the filter bag assembly, the cleaning assembly comprising a bidirectional annular scraper adapted along the axial cross-sectional profile of the filter bag assembly;

[0007] The bidirectional annular scraper makes axial reciprocating motion along the surface of the filter bag assembly, and its outer edge keeps in contact with the outer surface of the filter bag assembly, so as to scrape off and peel off the filter cake-like dust layer formed on the surface of the filter bag assembly due to moisture absorption, thereby reducing dust emission;

[0008] An inert gas input assembly is fixedly connected to the surface of the cleaning assembly. The inert gas input assembly includes a nozzle. The nozzle moves synchronously with the cleaning assembly and is used to spray inert gas to the scraping area to reduce the risk of explosion.

[0009] The cleaning component and the inert gas input component are moved synchronously, so that the bidirectional annular scraper can drive the nozzle to move synchronously. The mechanical scraping of the bidirectional annular scraper and the protection of the inert gas sprayed by the nozzle are carried out synchronously. While the scraper peels off the dust layer, the nozzle immediately inertizes the exposed surface. The process is coupled, the scraper moves downward to remove the filter cake layer, the nozzle synchronously sprays to cover the new surface, the scraper moves upward for secondary cleaning, and the nozzle continuously replenishes the inert gas.

[0010] As a further improvement of the present technical solution, a feed pipe is fixedly connected to the surface of the box body, and the feed pipe is located below the filter bag assembly. An exhaust pipe is fixedly connected to the surface of the box body, and the exhaust pipe is located above the filter bag assembly. A discharge bucket is fixedly connected to the bottom of the box body, and the discharge bucket is used for separated coal powder.

[0011] As a further improvement of the present technical solution, the filter bag assembly includes a support plate fixedly connected to the inner wall of the box body, the inner wall of the support plate is fixedly connected to a plurality of skeletons, the filter bag is fixedly sleeved on the surface of the skeleton, the top and bottom of the bidirectional annular scraper are both set to a conical structure, the bidirectional annular scraper is a cylindrical body, the inner wall of which is slidably fitted with the outer surface of the filter bag to ensure close contact during the scraping process and adapt to the surface contour of the filter bag to enhance the scraping effect and reduce wear of the filter bag, the surface of the bidirectional annular scraper is fixedly connected to a connecting frame, the connecting frame is used to connect a plurality of bidirectional annular scrapers into a whole, the top of the connecting frame is fixedly connected to a support block, the inner wall of the support block is provided with an inert gas input assembly, the inner wall of the box body is fixedly connected to a driving device, and the inner wall of the driving device is slidably connected to the surface of the connecting frame;

[0012] Gears and screws are provided inside the driving device, so that the connecting frame is threadedly connected to the surface of the screw. When the screw rotates, the connecting frame is driven to slide on the inner wall of the driving device, so that the connecting frame drives multiple bidirectional annular scrapers to move synchronously and scratch the surfaces of multiple filter bags at the same time.

[0013] As a further improvement of the present technical solution, the inert gas input assembly includes a telescopic tube fixedly connected to the inner wall of the support block, the surface of the telescopic tube is slidably connected to the input pipe, the telescopic tube is fixedly connected to the interior of the input pipe, and the end of the telescopic tube away from the input pipe is fixedly connected to the nozzle, the nozzle is a tubular structure, and a plurality of nozzle holes are arranged in an array on the tube wall. The surface of the box body is fixedly connected to the inert gas storage device, and the surface of the input pipe passes through the inner wall of the box body and is connected to the inert gas storage device.

[0014] The inert gas storage device continuously provides inert gas such as nitrogen, which is transported to the telescopic tube through the input pipe. The telescopic tube is slidably connected to the input pipe to ensure that the gas can still circulate stably during dynamic movement. When the cleaning component drives the bidirectional annular scraper to slide along the surface of the filter bag, the nozzle moves synchronously, and the telescopic tube expands and contracts with the movement of the nozzle to maintain the continuity of gas transportation. The nozzle holes on the surface of the nozzle are always aligned with the working area of ​​the scraper to ensure that the inert gas covers the newly stripped dust layer. The inert gas is ejected from the nozzle holes to form a local inerting environment, reducing the oxygen concentration in the area. The jet airflow also assists in loosening the scraped dust, allowing it to settle smoothly to the bottom of the box.

[0015] As a further improvement of the present technical solution, a sliding groove is provided on the inner wall of the input tube, a slider is fixedly connected to the surface of the telescopic tube, and the slider slides on the inner wall of the sliding groove;

[0016] The slider slides inside the slide groove on the inner wall of the input tube to form an axial guide structure, so that the telescopic tube always remains coaxial with the input tube during the extension or contraction process.

[0017] A second object of the present invention is to provide a pulverized coal silo explosion suppression and dust recovery processing coupling device and a manufacturing method thereof, comprising the following method steps:

[0018] Step 1: The dust-laden gas enters the box body through the feed pipe. Under the negative pressure generated by the fan connected to the exhaust pipe, it flows upward through the filter bag assembly. The filter bag intercepts the dust particles in the gas and makes them adhere to the surface. The purified air passes through the frame and enters the space above the support plate, and is finally discharged through the exhaust pipe.

[0019] Step 2: Start the driving device, and drive the connecting frame to move downward along the box guide rail through the screw drive. The connecting frame simultaneously pulls the bidirectional annular scraper, so that its inner wall slides against the surface of the filter bag to scrape off the accumulated dust layer;

[0020] Step 3: Connect the support block to the telescopic tube. When the connecting frame moves, the telescopic tube slides in the input tube, driving the nozzle to move downward synchronously. At this time, the inert gas in the nozzle is sprayed into the dust scraping area through the nozzle hole, quickly reducing the oxygen concentration in the area and suppressing the explosion risk.

[0021] Step 4: Control the drive device to drive the connecting frame to move in the opposite direction and reset. The conical structure on the top of the bidirectional annular scraper scrapes the surface of the filter bag for the second time to remove residual dust. At the same time, the nozzle continuously sprays inert gas to cover the dust raised during the reset process. The scraped dust falls into the discharge bucket under the action of gravity, realizing the simultaneous processing of dust cleaning, explosion suppression and dust recovery.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. In this pulverized coal silo explosion suppression and dust recovery coupling device, a bidirectional annular scraper is provided to slide against the filter bag surface. The conical structure at the bottom of the scraper scrapes the filter bag surface as it moves downward, scraping off the accumulated dust. Compared with traditional impact cleaning methods, this design avoids the instantaneous flying of large amounts of dust caused by violent vibration, effectively reducing the dust cloud concentration in the dust collector and the risk of explosion. At the same time, the flexible contact significantly reduces mechanical wear and extends the service life of the filter bag.

[0024] When the bidirectional annular scraper is reset in the opposite direction, the top conical structure moves upward along the surface of the filter bag synchronously to scrape off the residual dust for the second time. This bidirectional operation mode reduces the dust residue on the surface of the filter bag and significantly improves the cleaning efficiency.

[0025] 2. In this pulverized coal silo explosion suppression and dust recovery coupling device, the nozzle and the bidirectional annular scraper move synchronously to ensure that the inert gas covers the scraper operating area in real time. Nitrogen and other inert gases are sprayed at the dust cloud the moment it forms, quickly dispersing oxygen and reducing the local oxygen concentration to below the explosion limit, thus suppressing the explosion chain reaction at the source. In addition, the inert gas flow ejected from the nozzle holes of the nozzle can help loosen the scraped dust and reduce the secondary adhesion of dust on the filter bag surface. The synergistic effect of the airflow and the mechanical scraping of the scraper can remove stubborn dust from the folds of the filter bag, avoiding the residual hidden dangers of the traditional single scraping method.

[0026] The telescopic tube and the input pipe are slidably connected through a slider and a slide groove structure to ensure the continuity of gas delivery when the cleaning component moves back and forth, avoiding pipeline entanglement or leakage problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure assembly of the present invention;

[0028] Figure 2 It is a schematic structural diagram of the filter bag assembly of the present invention;

[0029] Figure 3 Schematic diagram of the structure of the inert gas storage device of the present invention;

[0030] Figure 4 It is a schematic structural diagram of the cleaning component of the present invention;

[0031] Figure 5 This is a schematic diagram of the input pipe structure of the present invention;

[0032] Figure 6 This is a schematic diagram of the bidirectional annular scraper structure of the present invention;

[0033] Figure 7 This is a schematic diagram of the telescopic tube structure of the present invention;

[0034] Figure 8 For the present invention Figure 7 Schematic diagram of the structure at point A.

[0035] The meaning of each number in the figure is:

[0036] 100, box body; 110, exhaust pipe; 120, feed pipe; 130, discharge barrel;

[0037] 200, filter bag assembly; 210, support plate; 220, frame; 230, filter bag;

[0038] 300. Inert gas storage device;

[0039] 400, inert gas input assembly; 410, input pipe; 4101, chute; 420, telescopic tube; 4201, slider; 430, nozzle; 4301, nozzle hole;

[0040] 500, cleaning assembly; 510, bidirectional annular scraper; 520, connecting frame; 530, supporting block; 540, driving device. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0042] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0044] Example 1

[0045] See also Figures 1-8 As shown, this embodiment provides a coupled device and method for explosion suppression and dust recovery in a pulverized coal silo, comprising a housing 100, a filter bag assembly 200 disposed within the interior of the housing 100, a cleaning assembly 500 slidingly sleeved on the surface of the filter bag assembly 200, and a bidirectional annular scraper 510 adapted to the axial cross-sectional profile of the filter bag assembly 200;

[0046] The bidirectional annular scraper 510 performs axial reciprocating motion along the surface of the filter bag assembly 200, with its outer edge maintaining contact with the outer surface of the filter bag assembly 200, and is used to scrape and peel off the filter cake-like dust layer formed on the surface of the filter bag assembly 200 due to moisture absorption, thereby reducing dust emission;

[0047] The surface of the cleaning component 500 is fixedly connected to an inert gas input component 400. The inert gas input component 400 includes a nozzle 430. The nozzle 430 moves synchronously with the cleaning component 500 to spray inert gas into the scraping area to reduce the risk of explosion.

[0048] Considering that existing equipment generally removes dust accumulated on the surface of the filter bag 230 by impacting the dust cleaning plate, which will cause a large amount of coal dust particles to be instantly lifted up, forming a high-concentration dust cloud inside the dust collector. When the lifted dust accumulates in a local area, it is very easy to reach or even exceed the explosion concentration threshold. Therefore, the bidirectional annular scraper 510 in the cleaning assembly 500 is made to slide axially along the surface of the filter bag assembly 200;

[0049] Scraping downwards: The bidirectional annular scraper 510 is pressed against the surface of the filter bag 230 to peel off the adhered dust layer;

[0050] Reset upwards: The top structure of the bidirectional annular scraper 510 scrapes the filter bag 230 again to ensure that the residual dust is completely removed;

[0051] During the movement of the bidirectional annular scraper 510, the nozzle 430 of the inert gas input assembly 400 moves synchronously and sprays an inert gas such as nitrogen toward the scraping area. The inert gas directly covers the newly exposed dust layer, dispersing oxygen and suppressing the risk of explosion. The blown air flow helps loosen the scraped dust so that it falls smoothly to the bottom of the box body 100. After cleaning is completed, the bidirectional annular scraper 510 is reset, the filter bag assembly 200 continues to filter the gas, and automatically starts the next cleaning according to the pressure difference or timing setting.

[0052] At the same time, it is taken into consideration that the mechanical friction and vibration generated by the impact of the cleaning plate on the filter bag 230, as well as the mutual collision between dust particles, may generate static electricity or sparks. Once the ignition source and the combustible dust cloud exist at the same time, it will directly cause an explosion, seriously threatening the safety of the equipment and the life and health of the operator, making it difficult to ensure the safe installation and stable operation of the equipment in the coal dust removal scenario. Therefore, the two-way annular scraper 510 flexibly contacts the surface of the filter bag assembly 200, which reduces mechanical wear and extends the service life of the filter bag 230 compared to vibration or high-frequency pulse backblowing. The cleaning process does not require shutdown, and continuous operation is achieved through program control, which is suitable for high-load industrial scenarios. In addition, the scraping action generates less dust than the impact.

[0053] In actual application, if the equipment encounters a working condition that requires explosion relief, it can be safely released by adding an explosion relief vent, which is opened during the explosion relief operation to complete the explosion relief process.

[0054] It should be noted that during the explosion venting operation, the explosion venting area should be strictly prevented from contacting flammable factors such as fire sources to prevent secondary hazards. Since the specific structure, opening mechanism and related safety regulations of the explosion vent are common knowledge in this technical field, they will not be elaborated here.

[0055] In order to allow the coal powder to enter the inner cavity of the box body 100, a feed pipe 120 is fixedly connected to the surface of the box body 100, and the feed pipe 120 is located below the filter bag assembly 200. An exhaust pipe 110 is fixedly connected to the surface of the box body 100, and the exhaust pipe 110 is located above the filter bag assembly 200. A discharge barrel 130 is fixedly connected to the bottom of the box body 100, and the discharge barrel 130 is used for separating the coal powder;

[0056] In order to ensure that the gas can be discharged smoothly from the exhaust pipe 110, a fan needs to be connected to the exhaust pipe 110 to guide the gas to flow upward;

[0057] The gas containing coal powder enters the inner cavity of the box body 100 through the feed pipe 120. At this time, large particles of dust will first fall into the inside of the discharge barrel 130, and the remaining fine particles of dust will move upward with the airflow to the filter bag assembly 200. When the rising airflow passes through the filter bag assembly 200, the coal powder particles are intercepted on the surface of the filter bag assembly 200. The purified gas is collected in the inner cavity of the filter bag assembly 200 to the area above the box body 100 and discharged through the exhaust pipe 110.

[0058] In order to enable the filter bag assembly 200 to filter the gas entering the inner cavity of the box body 100, it is necessary to further disclose the parts of the filter bag assembly 200. Therefore, the filter bag assembly 200 includes a support plate 210 fixedly connected to the inner wall of the box body 100, and a plurality of frames 220 are fixedly connected to the inner wall of the support plate 210. The surface of the frame 220 is fixedly sleeved with a filter bag 230;

[0059] In order to make the bidirectional annular scraper 510 fit on the surface of the filter bag 230, the bidirectional annular scraper 510 needs to be further disclosed. Therefore, the bidirectional annular scraper 510 is made into a cylindrical body, and its inner wall is slidably fitted with the outer surface of the filter bag 230 to ensure close contact during the scraping process.

[0060] The top and bottom of the bidirectional annular scraper 510 are both configured as conical structures, adapted to the surface contour of the filter bag 230 to enhance the scraping effect and reduce wear of the filter bag 230;

[0061] The bidirectional annular scraper 510 is made of a wear-resistant, antistatic polymer composite material or a metal substrate with a flexible wear-resistant coating on the surface, and is selected according to the usage scenario.

[0062] In order to enable the bidirectional annular scraper 510 to clean the surfaces of multiple filter bags 230, it is necessary to further disclose the parts of the cleaning assembly 500. Therefore, a connecting frame 520 is fixedly connected to the surface of the bidirectional annular scraper 510. The connecting frame 520 is used to connect the multiple bidirectional annular scrapers 510 into a whole.

[0063] The top of the connecting frame 520 is fixedly connected to a support block 530 , and the inner wall of the support block 530 is provided with an inert gas input assembly 400 ;

[0064] During the downward movement of the cleaning assembly 500 , the bidirectional annular scraper 510 scrapes dust off the surface of the filter bag 230 . The provided connecting frame 520 can ensure that the multiple bidirectional annular scrapers 510 move downward synchronously to clean the surfaces of multiple filter bags 230 at the same time.

[0065] In order to enable the connecting frame 520 to drive the multiple bidirectional annular scrapers 510 to move downward and upward simultaneously, a driving device 540 is fixedly connected to the inner wall of the box body 100, and the inner wall of the driving device 540 is slidably connected to the surface of the connecting frame 520;

[0066] The driving device 540 is internally provided with gears and a screw rod, so that the connecting frame 520 is threadedly connected to the surface of the screw rod. When the screw rod rotates, the connecting frame 520 is driven to slide on the inner wall of the driving device 540, thereby causing the connecting frame 520 to drive multiple bidirectional annular scrapers 510 to move synchronously.

[0067] In order to allow the nozzle 430 to cooperate with the sliding of the bidirectional annular scraper 510 and input inert gas to the area where the dust cloud is formed, the inert gas input assembly 400 includes a telescopic tube 420 fixedly connected to the inner wall of the support block 530. The surface of the telescopic tube 420 is slidably connected to the input pipe 410, and the telescopic tube 420 is fixedly connected to the interior of the input pipe 410.

[0068] The surface of the box body 100 is fixedly connected to the inert gas storage device 300, and the surface of the inlet pipe 410 passes through the inner wall of the box body 100 and is connected to the inert gas storage device 300;

[0069] The end of the telescopic tube 420 away from the input tube 410 is fixedly connected to the nozzle 430. The nozzle 430 is a tubular structure with a plurality of nozzle holes 4301 arranged in an array on its wall.

[0070] The inert gas storage device 300 continuously provides inert gas such as nitrogen, which is transported to the telescopic tube 420 through the input pipe 410. The telescopic tube 420 is slidably connected to the input pipe 410 to ensure that the gas can still circulate stably during dynamic movement. When the cleaning component 500 drives the bidirectional annular scraper 510 to slide along the surface of the filter bag 230, the nozzle 430 moves synchronously, and the telescopic tube 420 expands and contracts with the movement of the nozzle 430 to maintain the continuity of gas transportation. The nozzle hole 4301 on the surface of the nozzle 430 is always aligned with the working area of ​​the bidirectional annular scraper 510 to ensure that the inert gas covers the newly peeled dust layer. The inert gas is ejected from the nozzle hole 4301 to form a local inert environment, reducing the oxygen concentration in the area. The jet airflow also helps to loosen the scraped dust and make it settle smoothly to the bottom of the box.

[0071] In order to ensure that the sliding connection between the telescopic tube 420 and the input tube 410 remains stable, a slide groove 4101 is provided on the inner wall of the input tube 410, and a slider 4201 is fixedly connected to the surface of the telescopic tube 420, and the surface of the slider 4201 slides on the inner wall of the slide groove 4101; the telescopic tube 420 is in a retracted state, and the slider 4201 is located at the starting end of the slide groove 4101, and the inert gas storage device 300 continuously supplies gas, and the gas enters the telescopic tube 420 through the input tube 410. When the cleaning component 500 drives the nozzle 430 to move outward, the telescopic tube 420 extends accordingly, and the slider 4201 slides smoothly along the slide groove 4101, ensuring that the telescopic tube 420 and the input tube 410 always remain coaxial, and the inert gas is continuously transported through the path of input tube 410 → telescopic tube 420 → nozzle 430.

[0072] The second object of the present invention is to provide a method for manufacturing a coupled device for explosion suppression and dust recovery in a pulverized coal silo, which comprises the following steps:

[0073] Step 1: Dust-laden gas enters the box body 100 through the feed pipe 120. Under the negative pressure generated by the fan connected to the exhaust pipe 110, it flows upward through the filter bag assembly 200. The filter bag 230 intercepts dust particles in the gas and causes them to adhere to the surface. The purified air passes through the frame 220 and enters the space above the support plate 210, and is finally discharged from the exhaust pipe 110.

[0074] Step 2: Start the driving device 540, which drives the connecting frame 520 to move downward along the box guide rail through the screw drive. The connecting frame 520 simultaneously pulls the bidirectional annular scraper 510, causing its inner wall to slide against the surface of the filter bag 230 to scrape off the accumulated dust layer;

[0075] Step 3: The support block 530 is connected to the telescopic tube 420. When the connecting frame 520 moves, the telescopic tube 420 slides in the input pipe 410, driving the nozzle 430 to move downward synchronously. At this time, the inert gas in the nozzle 430 is sprayed into the dust scraping area through the nozzle hole 4301, quickly reducing the oxygen concentration in the area and suppressing the explosion risk.

[0076] Step 4: Control the drive device 540 to drive the connecting frame 520 to move in the opposite direction and reset. The conical structure on the top of the bidirectional annular scraper 510 scrapes the surface of the filter bag 230 for the second time to remove residual dust. At the same time, the nozzle 430 continuously sprays inert gas to cover the dust raised during the reset process. The scraped dust falls into the discharge barrel 130 under the action of gravity, realizing the simultaneous processing of dust cleaning, explosion suppression and dust recovery.

[0077] In summary, the workflow of the present invention is:

[0078] The pulverized coal gas enters the box body 100 through the feed pipe 120. By virtue of the gas flow direction and gravity, large particles of dust first settle to the discharge barrel 130, and the remaining fine particles of dust move upward with the airflow. The fan at the exhaust pipe 110 is started to form a negative pressure, guiding the airflow to pass through the filter bag assembly 200. When the airflow passes through the filter bag assembly 200, the filter bag 230 intercepts the dust particles under the support of the skeleton 220, so that the dust particles adhere to the surface of the filter bag 230 to form a dust layer. The purified gas is collected to the top of the box through the inner cavity of the filter bag 230 and discharged through the exhaust pipe 110. When the dust layer on the surface of the filter bag 230 reaches a certain thickness, the driving device 540 is started, and the gear and screw drive drive the connecting frame 520 downward. The connecting frame 520 pulls a plurality of bidirectional annular scrapers 510 to slide axially along the surface of the corresponding filter bag 230. At this time, the conical structure of the top and bottom of the bidirectional annular scraper 510 The cake-like dust layer on the surface of the filter bag 230 is gradually scraped off and peeled off to reduce dust emission. During the downward cleaning process of the scraper, the support block 530 drives the inert gas input assembly 400 to move synchronously, the telescopic tube 420 slides and extends in the input pipe 410, and the slider 4201 moves smoothly along the slide groove 4101 to ensure stable gas delivery. The nozzle 430 moves to the working area with the scraper, and its pipe wall nozzle 4301 is aimed at the newly peeled dust layer. The inert gas such as nitrogen output by the inert gas storage device 300 is ejected from the nozzle 4301 through the input pipe 410 and the telescopic tube 420, quickly dispersing oxygen and forming a local inert environment. At the same time, it helps loosen the dust and makes it fall into the discharge bucket 130. The driving device 540 controls the connecting frame 520 to move in the opposite direction, and the conical structure at the top of the bidirectional annular scraper 510 scrapes the filter bag 230 for a second time to remove residual dust.

[0079] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for coupling explosion suppression and dust recovery in a pulverized coal silo, comprising a housing (100), characterized in that: The inner cavity of the box body (100) is provided with a filter bag assembly (200), and a cleaning assembly (500) is provided on the surface of the filter bag assembly (200) in a sliding sleeve, and the cleaning assembly (500) includes a bidirectional annular scraper (510) adapted along the axial cross-sectional profile of the filter bag assembly (200); The bidirectional annular scraper (510) performs axial reciprocating motion along the surface of the filter bag assembly (200), with its outer edge maintaining contact with the outer surface of the filter bag assembly (200), and is used to scrape and peel off the filter cake-like dust layer formed on the surface of the filter bag assembly (200) due to moisture absorption, thereby reducing dust emission; An inert gas input component (400) is fixedly connected to the surface of the cleaning component (500), and the inert gas input component (400) includes a nozzle (430). The nozzle (430) moves synchronously with the cleaning component (500) and is used to spray inert gas to the scraping area to reduce the risk of explosion.

2. The pulverized coal silo explosion suppression and dust recovery coupling device according to claim 1 is characterized by: The surface of the box body (100) is fixedly connected to a feed pipe (120), and the feed pipe (120) is located below the filter bag assembly (200). The surface of the box body (100) is fixedly connected to an exhaust pipe (110), and the exhaust pipe (110) is located above the filter bag assembly (200). The bottom of the box body (100) is fixedly connected to a discharge barrel (130), and the discharge barrel (130) is used for separated coal powder.

3. The pulverized coal silo explosion suppression and dust recovery coupling device according to claim 1 is characterized in that: The filter bag assembly (200) comprises a support plate (210) fixedly connected to the inner wall of the box body (100); a plurality of frames (220) are fixedly connected to the inner wall of the support plate (210); and filter bags (230) are fixedly sleeved on the surface of the frames (220).

4. The pulverized coal silo explosion suppression and dust recovery coupling device according to claim 3 is characterized by: The bidirectional annular scraper (510) is a cylindrical body, and its inner wall is in sliding contact with the outer surface of the filter bag (230) to ensure close contact during the scraping process.

5. The pulverized coal silo explosion suppression and dust recovery and treatment coupling device according to claim 4 is characterized in that: The top and bottom of the bidirectional annular scraper (510) are both configured as conical structures, adapted to the surface profile of the filter bag (230), so as to enhance the scraping effect and reduce the wear of the filter bag (230).

6. The pulverized coal silo explosion suppression and dust recovery coupling device according to claim 5 is characterized by: A connecting frame (520) is fixedly connected to the surface of the bidirectional annular scraper (510), and the connecting frame (520) is used to connect multiple bidirectional annular scrapers (510) into a whole; A support block (530) is fixedly connected to the top of the connecting frame (520), and an inert gas input assembly (400) is provided on the inner wall of the support block (530).

7. The pulverized coal silo explosion suppression and dust recovery coupling device according to claim 6 is characterized in that: The inner wall of the box body (100) is fixedly connected to a driving device (540), and the inner wall of the driving device (540) is slidably connected to the surface of the connecting frame (520).

8. The pulverized coal silo explosion suppression and dust recovery coupling device according to claim 6 is characterized by: The inert gas input assembly (400) includes a telescopic tube (420) fixedly connected to the inner wall of the support block (530), the surface of the telescopic tube (420) is slidably connected to the input pipe (410), and the telescopic tube (420) is fixedly connected to the inside of the input pipe (410); An inert gas storage device (300) is fixedly connected to the surface of the box body (100), and the surface of the input pipe (410) passes through the inner wall of the box body (100) and is in communication with the inert gas storage device (300); One end of the telescopic tube (420) away from the input tube (410) is fixedly connected to a nozzle (430). The nozzle (430) is a tubular structure, and a plurality of nozzle holes (4301) are arranged in an array on the tube wall.

9. The pulverized coal silo explosion suppression and dust recovery coupling device according to claim 8 is characterized in that: A sliding groove (4101) is provided on the inner wall of the input tube (410), and a slider (4201) is fixedly connected to the surface of the telescopic tube (420), and the surface of the slider (4201) slides on the inner wall of the sliding groove (4101).

10. A device and method for coupling explosion suppression and dust recovery in a pulverized coal silo according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: Step 1: Dust-laden gas enters the box body (100) through the feed pipe (120), and flows upward through the filter bag assembly (200) under the negative pressure generated by the fan connected to the exhaust pipe (110). The filter bag (230) intercepts dust particles in the gas and causes them to adhere to the surface. The purified air then enters the space above the support plate (210) through the frame (220) and is finally discharged from the exhaust pipe (110); Step 2: Start the driving device (540), drive the connecting frame (520) to move downward along the box guide rail through the screw drive, and the connecting frame (520) synchronously pulls the bidirectional annular scraper (510) so that its inner wall slides against the surface of the filter bag (230) to scrape off the accumulated dust layer; Step 3: The support block (530) is connected to the telescopic tube (420). When the connecting frame (520) moves, the telescopic tube (420) slides in the input tube (410), driving the nozzle (430) to move downward synchronously. At this time, the inert gas in the nozzle (430) is sprayed into the dust scraping area through the spray hole (4301), quickly reducing the oxygen concentration in the area and suppressing the explosion risk. Step 4: Control the drive device (540) to drive the connecting frame (520) to move in the reverse direction and reset. The conical structure on the top of the bidirectional annular scraper (510) scrapes the surface of the filter bag (230) for a second time to remove residual dust. At the same time, the nozzle (430) continuously sprays inert gas to cover the dust raised during the reset process. The scraped dust falls into the discharge barrel (130) under the action of gravity, thereby achieving simultaneous processing of dust cleaning, explosion suppression and dust recovery.

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