Ultra-long double-bag-head bag-type dust collector

Abstract

The utility model relates to the field of flue gas dust removal and purification, and discloses a super-long double-bag-head bag-type dust remover, which comprises a gas inlet reducing section and a gas outlet reducing section which are positioned on two sides of a box body, and a dust hopper positioned at the bottom, a flow guide grid, a flow guide arc plate and a pulse valve blowing system connected with the box body are arranged in the box body, and a lattice plate is arranged in the box body. The pulse valve blowing system is composed of a blowing bag, a blowing pipe, nozzles and a mounting support, the air inlet reducing section and the outlet reducing section are each provided with a horizontal flow guide plate, a flow guide arc plate and an air duct folded plate are arranged in the box body, each nozzle corresponds to one filter bag, the filter bags are sequentially distributed in a crude air chamber in a lattice plate in the transverse direction and the longitudinal direction, and bag cages are arranged in the filter bags; the bag cage comprises a main bag cage and an auxiliary bag cage. And the two ends of each filter bag are fixed on the lattice plates on the two sides, the filter bags shake during pulse dust removal, but collision and abrasion between the filter bags cannot be generated, the service life of the filter bags is prolonged, and the operation and maintenance cost after a project is put into production is reduced.

Description

Technical Field

[0001] The utility model relates to the field of smoke dust removal and purification, in particular to an ultra-long double-bag head type bag dust collector. Background Art

[0002] At present, long filter bag pulse dust collectors have been widely used in blast furnace coal injection system dust collectors, steel plant secondary dust removal, and tertiary dust removal. However, there are two problems in the use of this type of dust collector:

[0003] (1) The length of the filter bag has always been limited to 8m, because if the length exceeds 8m, the pulse cleaning effect at the bottom of the filter bag will deteriorate. If the length limit of 8m can be exceeded, more filtering area can be obtained under the same floor space, which will greatly reduce the cost of the dust collector per square meter of filtering area.

[0004] (2) Since the length of the filter bags is 6-8m, the verticality of the filter bag installation cannot meet the requirements. The gap at the bottom of most filter bags becomes very small. Under the impact of smoke filtration, the bottom of the bag rubs violently. According to practical experience, more than 80% of the damaged filter bags are damaged by friction between the filter bags and the equipment wall panels.

[0005] In the document CN202020389384, a bag-type dust collector produced by processing lanthanum, cerium and rare earth is disclosed, including a bag-type dust collector body, an electromagnetic pulse valve is installed on one side of the bag-type dust collector body, and a bag is provided in the bag-type dust collector body, and a dust cleaning bucket is provided at the lower end of the bag-type dust collector body, the bag-type dust collector body is a cylindrical structure, and a first porous plate is provided above the bag-type dust collector body, and a second porous plate is provided below the bag-type dust collector body, and an air inlet and an air outlet are provided on the side of the bag-type dust collector body, and a supporting leg is connected to the lower end of the bag-type dust collector body, and a box body is provided at the lower end of the bag-type dust collector body, and a box cover is provided at the upper end of the box body. The bags of this structure are not fixed, and they are easy to collide with each other during the spraying, causing damage to the bags and reducing the service life of the bags.

[0006] Therefore, a new technical solution is needed to solve the above technical problems. Summary of the invention

[0007] In order to solve the above problems, the utility model discloses an extra-long double-bag head type bag dust collector, which realizes intensive design, occupies a smaller area, has a lower cost per square meter of filtration area, and reduces the initial investment cost of the project. The two ends of the filter bag are fixed on the grating plates on both sides. The filter bag shakes during pulse cleaning, but no collision or wear between the filter bags occurs, which greatly extends the service life of the filter bag, thereby reducing the operation and maintenance costs after the project is put into production.

[0008] The technical solution of the utility model is: an extra-long double-bag head type bag dust collector, including an air inlet reducing section and an air outlet reducing section located on both sides of the box body and a ash hopper located at the bottom, a guide grille and a guide arc plate and a pulse valve spray system connected to the box body are arranged in the box body, a lattice plate is arranged in the box body, the pulse valve spray system consists of a spray bag, a spray pipe, a nozzle and a mounting support, the air inlet reducing section and the outlet reducing section are both provided with horizontal guide plates, a guide arc plate and an air duct folding plate are arranged in the box body, each nozzle corresponds to a filter bag, the filter bags are sequentially arranged in the waste gas chamber in the lattice plate horizontally and vertically, a bag cage is arranged in the filter bag, and the bag cage includes a main bag cage and an auxiliary bag cage.

[0009] By adopting the above technical solution, the filter bag has a double bag head and adopts a pulse cleaning design on both sides, so the filter bag cleaning is more uniform and thorough, and the cleaning effect is better. The two ends of the filter bag are fixed on the grating plates on both sides. The filter bag shakes during pulse cleaning, but there will be no collision and wear between the filter bags, which greatly extends the service life of the filter bag, thereby reducing the operation and maintenance costs after the project is put into production.

[0010] Preferably, the plate spacing at the outlet of the horizontal guide plate is larger than that at the inlet, and a spacing is provided between the outlet of the horizontal guide plate and the first row of filter bags. The horizontal guide plate of the air inlet variable diameter section takes the inlet as the radiation source, radiates evenly toward the middle, and performs horizontal differentiation and uniform distribution. The flow area gradually expands toward the middle of the box body, and the part of the horizontal guide plate located at the air outlet variable diameter section is opposite to the air inlet variable diameter section.

[0011] By adopting the above technical solution, the filter bags are arranged horizontally, and the gaps between the filter bags are also horizontal gaps. The horizontal guide plates divide and distribute the airflow horizontally, and the flow area is gradually expanded, so that the airflow flows into the filter bags smoothly and evenly. The distance between the horizontal guide plate outlet and the filter bags can prevent the smoke from excessively scouring the first row of filter bags.

[0012] Preferably, grille plate platforms are arranged in sequence from bottom to top between both sides of the grating plate and the box body, a clean air chamber is provided between the grille plate platforms, bag inspection platforms are provided in sequence outside the box body on one side of the clean air chamber, a maintenance manhole door is also provided on the box body on the side wall of the clean air chamber, and a guide grille is provided between the box body and the grating plate on the side of the grille plate platform close to the air outlet reducing section.

[0013] By adopting the above technical solution, the grid plate platform performs preliminary horizontal diversion of the clean flue gas entering the clean air chamber into several air flows, and can also serve as an installation and maintenance platform for filter bags, bag cages, and injection pipes.

[0014] Preferably, several guide arc plates are provided on the outside of the guide grille, that is, located between the right-angled outside of the grating plate and the direct inside of the box body, with the whole being an inward arc toward the grating plate, and the guide arc plates are placed in a mirror image.

[0015] By adopting the above technical solution, the guide arc plate further guides the smoke flowing out of the guide grid plate, making the flow path smooth and reducing the resistance loss at the turning point of the flow path.

[0016] Preferably, the duct folding plate is located on one side of the lattice plate close to the outlet diameter reducing section, the duct folding plate is two steel plates with an obtuse angle set toward the outlet diameter reducing section, and the upper and lower parts of the duct folding plate are both welded and fixed to the box body.

[0017] By adopting the above technical solution, the airflow flowing out from the guide arc plate impacts the guide fold plate, and guides the airflow to the outlet diameter reducing section to discharge the equipment.

[0018] Preferably, a spray bag maintenance platform is provided on one side of the pulse valve spray system. The spray bag is installed on the upper and lower parts of the box through a mounting bracket. The spray bag is connected to the spray pipe in sequence. The spray pipe is vertically arranged. Nozzles are provided on the spray pipe in sequence. The nozzle mouth is facing the center of the filter bag. A nozzle is provided at both ends of each filter bag.

[0019] By adopting the above technical scheme, the nozzle is a high-sonic injection nozzle, which has the function of accelerating the injection airflow. The pulse valve is installed on the injection bag. Under the control of the external solenoid valve, the internal diaphragm of the pulse valve opens instantly, and a large amount of nitrogen is sprayed from the injection bag into the injection pipe, and then sprayed into the filter bag at high speed through the nozzle. At the same time, a large amount of airflow in the clean air chamber is guided into the filter bag, causing the filter bag to expand, shrink and shake instantly, and the ash on the outer surface of the filter bag is shaken into the ash hopper.

[0020] Preferably, the filter bag is in the shape of a ring with openings at both ends. Both ends of the filter bag openings are wrapped with inwardly recessed concave rings, which are stainless steel ring sheets. The size of the concave ring and the grating plate are mutually adapted. The concave ring achieves a sealing effect with the grating plate holes under the expansion effect. The two ends of the filter bag are buckled on the main bag cage and the auxiliary bag cage through end covers respectively, and Venturi tubes are provided in the end covers on both sides.

[0021] By adopting the above technical solution, the filter bag adopts a double bag head design, which can realize double-head pulse jet cleaning. The entire filter bag can be thoroughly cleaned, and there is no phenomenon of incomplete cleaning of the bottom of a single bag filter bag. The end cover buckles the filter bag mouth, which can protect the bag mouth. The end cover has a built-in venturi. During pulse cleaning, external cleaning nitrogen is ejected from the nozzle into the venturi. The nitrogen forms an acceleration effect inside the venturi, and a slight negative pressure is generated at the mouth of the pipe, which will guide a large amount of airflow in the clean air chamber to flow into the filter bag. The accelerated airflow is ejected from the outlet of the venturi and will reach a farther distance. A large amount of airflow enters the filter bag, causing the filter bag to expand instantly, shrink and shake, and the ash on the outer surface of the filter bag is shaken into the ash hopper.

[0022] Preferably, the main bag cage and the auxiliary bag cage are respectively located at the two ends of the filter bag. The main bag cage is located inside the filter bag, and a sealing sleeve is provided at its end. A continuous semicircular ring groove is provided inside the sealing sleeve, which is located close to the grating plate on the other side of the filter bag. Longitudinal ribs are horizontally penetrated in the main bag cage, and an anti-support ring is vertically surrounded on the longitudinal ribs.

[0023] By adopting the above technical solution, the longitudinal ribs and the anti-support ring support the filter bag, and the sealing sleeve can cooperate with the auxiliary bag cage clamp ring to seal.

[0024] Preferably, a secondary bag cage is provided between the main bag cage and the other side of the filter bag, and the secondary bag cage includes transverse longitudinal ribs, and a plurality of clamping rings are provided outside the longitudinal ribs. The clamping rings are located on the longitudinal ribs in an arc shape, and there are intervals between the ends of the clamping rings. The clamping rings in each semicircular ring groove are located in a vertical plane, and the clamping rings and the semicircular ring grooves are adapted to each other.

[0025] By adopting the above technical solution, when the clamping ring is inserted into the sealing sleeve, as the end cover of the auxiliary bag cage is pressed, the interval between the clamping rings can provide a shrinkage space between the clamping rings, and the clamping ring will be locked on the appropriate semicircular ring groove inside the sealing sleeve. At this time, it can be ensured that the two ends of the bag cage are tightly fitted with the bag opening of the filter bag and installed in place.

[0026] Preferably, the ash hopper is located below the filter bag, and a manual gate valve and an electric ash discharge valve are provided at the bottom of the ash hopper.

[0027] By adopting the above technical solution, the ash hopper is used to store the dust that falls and settles down during the pulse cleaning of the filter bag, and the manual plug valve and the electric ash discharge valve are used to discharge the accumulated dust in the ash hopper.

[0028] The benefits of the utility model are as follows: 1. The utility model provides a bag cage inside the filter bag, which supports the filter bag. When pulse cleaning is performed, the filter bag shakes because the bag cage supports the filter bag, but there will be no collision or wear between the filter bags, which greatly extends the service life of the filter bag, thereby reducing the operation and maintenance costs after the project is put into production.

[0029] 2. The utility model filter bag has a double bag head, nozzles are provided at both ends of the filter bag, and a venturi is provided at the end. Nitrogen forms an acceleration effect inside the venturi, and a slight negative pressure is generated at the mouth of the pipe, which will guide a large amount of airflow in the clean air chamber to flow into the filter bag. The accelerated airflow is ejected from the outlet of the venturi and will reach a farther distance. A large amount of airflow enters the filter bag, causing the filter bag to expand instantly, then shrink and shake, and the ash on the outer surface of the filter bag is shaken off into the ash hopper. The pulse cleaning design on both sides is adopted, so the filter bag is cleaned more evenly and thoroughly, and the cleaning effect is better.

[0030] 3. The filter bags of the utility model are arranged in sequence horizontally and vertically inside the box, which realizes intensive use with a smaller floor space, lower cost per square meter of filtration area, and reduces the initial investment cost of the project. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the structure of the utility model;

[0032] Figure 2 For this utility model Figure 1 A schematic diagram of the structure in side view;

[0033] Figure 3 For this utility model Figure 1 A schematic diagram of the structure in top view;

[0034] Figure 4 This is a schematic diagram of the structure of the bag cage of the utility model;

[0035] Figure 5 For this utility model Figure 4 A schematic diagram of the structure of the enlarged view of part A;

[0036] Figure 6 It is a structural schematic diagram of a side view of the auxiliary cage bag of the utility model;

[0037] Figure 7 This is a structural schematic diagram of the grating plate of the utility model;

[0038] Figure 8 It is a structural schematic diagram of the guide grille of the utility model.

[0039] Among them: 1. Air inlet reducer, 2. Horizontal guide plate, 3. Pulse valve spray system, 3-1. Spray bag, 3-2. Spray pipe, 3-3. Nozzle, 3-4. Mounting support, 4. Guide grille, 5. Box, 6. Air outlet reducer, 7. Electric ash discharge valve, 8. Manual plug valve, 9. Ash hopper, 10. Spray bag maintenance platform, 11. Bag maintenance platform, 12. Maintenance manhole door, 13. Grille plate platform, 14. Clean air Chamber, 15, waste gas chamber, 16, filter bag, 16-1, bag cage, 16-3, end cover, 16-4, venturi tube, 16-5, longitudinal ribs, 16-12, main bag cage, 16-121, back support ring, 16-122, sealing sleeve, 16-1221, semicircular ring groove, 16-13, auxiliary bag cage, 16-131, retaining ring, 16-6, concave ring, 17, lattice plate, 18, guide arc plate, 19, duct folding plate. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0041] like Figure 1-3As shown, the super-long double-bag head type bag dust collector includes an air inlet reducer 1 and an air outlet reducer 6 located on both sides of a box body 5 and an ash hopper 9 located at the bottom, a guide grille 4 and a guide arc plate 18 in the box body 5, and a pulse valve spray system 3 connected to the box body 5, a grating plate 17 is provided in the box body 5, and the pulse valve spray system 3 consists of a spray bag 3-1, a spray pipe 3-2, a nozzle 3-3 and a mounting support 3-4, the air inlet reducer 1 and the outlet reducer 6 are both provided with a horizontal guide plate 2, a guide arc plate 18 and a duct folding plate 19 are provided in the box body 5, and each nozzle 3-3 corresponds to a Filter bag 16, filter bag 16 is arranged in the waste gas chamber 15 in the lattice plate 17 in sequence horizontally and vertically, and a bag cage 16-1 is arranged in the filter bag 16, and the bag cage 16-1 includes a main bag cage 16-12 and an auxiliary bag cage 16-13. The filter bag 16 has a double bag head and adopts a two-side pulse cleaning design, so the filter bag 16 is cleaned more evenly and thoroughly, and the cleaning effect is better. The two ends of the filter bag 16 are fixed on the lattice plates 17 on both sides. During pulse cleaning, the filter bag 16 shakes, but there will be no collision and wear between the filter bags 16, which greatly extends the service life of the filter bag, thereby reducing the operation and maintenance costs after the project is put into production.

[0042] The plate spacing at the outlet of the horizontal guide plate 2 is larger than that at the inlet, the plate spacing at the inlet is about 300mm, and the plate spacing at the outlet is about 600mm. There is a spacing between the outlet of the horizontal guide plate 2 and the first row of filter bags 16, which is 600mm away from the first row of filter bags. The spacing between the outlet of the horizontal guide plate 2 and the filter bags 16 can prevent the excessive scouring of the first row of filter bags 16 by smoke. The horizontal guide plate 2 of the air inlet variable diameter section 1 takes the inlet as the radiation source, radiates evenly toward the middle, and performs horizontal differentiation and uniform distribution. The flow area gradually expands toward the middle of the box body 5. The part of the horizontal guide plate 2 located at the air outlet variable diameter section 6 is opposite to the air inlet variable diameter section 1. The filter bags 16 are horizontally arranged, and the gaps between the filter bags 16 are also horizontal gaps. The horizontal guide plate 2 differentiates and distributes the airflow horizontally, and the flow area gradually expands, so that the airflow flows into the filter bags 16 horizontally and evenly.

[0043] like Figure 7-8 As shown, grid plate platforms 13 are arranged in sequence from bottom to top between both sides of the grid plate 17 and the box body 5. The holes of the grid plate platforms 13 are relatively small. This platform has 3 layers in total. A clean air chamber 14 is provided between each layer of grid plate platforms 13. Bag inspection platforms 11 are provided on the outside of the box body 5 on one side of the clean air chamber 14. A maintenance manhole door 12 is also provided on the box body 5 on the side wall of the clean air chamber 14. A guide grid 4 is provided between the box body 5 and the grid plate 17 on the side of the grid plate platform 13 close to the air outlet reducing section 6. The grid plate platform 13 performs preliminary horizontal diversion on the clean flue gas entering the clean air chamber 14, dividing it into several air flows, and can also serve as an installation and inspection platform for the filter bag 16, the bag cage 16-1, and the blowing pipe 3-2.

[0044] Several guide arc plates 18 are provided on the outside of the guide grille 4, which are 90° arc plates, that is, they are located between the right-angled outside of the grating plate 17 and the direct inside of the box body 5. The whole is an inward arc facing the grating plate 17. The guide arc plates 18 are placed in a mirror image. The guide arc plates 18 further guide the smoke flowing out of the guide grille 4 to make the flow path smooth and reduce the resistance loss at the turning point of the flow path.

[0045] The air duct fold plate 19 is located on the side of the grating plate 17 close to the air outlet reducing section 6. The air duct fold plate 19 is two steel plates that are set at an obtuse angle toward the air outlet reducing section 6. The upper and lower parts of the air duct fold plate 19 are welded and fixed to the box body 5. The airflow flowing out from the guide arc plate 18 hits the guide fold plate 19, and guides the airflow to the air outlet reducing section 6 to discharge the equipment.

[0046] A spray bag maintenance platform 10 is provided on one side of the pulse valve spray system 3. The spray bag 3-1 is installed on the upper and lower parts of the box body 5 through the mounting support 3-4. The spray bag 3-1 is connected with the spray pipe 3-2 in sequence. The spray pipe 3-2 is vertically arranged. The spray pipe 3-2 is provided with nozzles 3-3 in sequence. The nozzle 3-3 is directly facing the center of the filter bag 16. Each filter bag 16 has a nozzle 3-3 at both ends. The nozzle 3-3 is a high-speed injection nozzle, which has the function of accelerating the spraying airflow. The pulse valve is installed on the spray bag. Under the control of the external solenoid valve, the internal diaphragm of the pulse valve opens instantly, and a large amount of nitrogen is sprayed from the spray bag 3-1 into the spray pipe 3-2, and is sprayed into the inside of the filter bag 16 at high speed through the nozzle 3-3. At the same time, a large amount of airflow from the clean air chamber 14 is guided into the inside of the filter bag 16, so that the filter bag 16 produces instantaneous expansion, contraction and shaking, and the ash on the outer surface of the filter bag 16 is shaken off into the ash hopper 9.

[0047] The filter bag 16 adopts an extra-long cloth bag, usually 12-18m. The filter bag 16 is annular with openings at both ends. The filter bag is made of polyester needle-punched felt filter material, PTFE coating, water-repellent and oil-proof treatment, temperature resistance of 120°C, good chemical stability, and good filtering effect. The two ends of the opening of the filter bag 16 are wrapped with inwardly concave concave rings 16-6, which are stainless steel rings. The size of the concave ring 16-6 and the lattice plate 17 are mutually adapted. The concave ring 16-6 achieves a sealing effect with the lattice plate hole 17 under the action of expansion. The two ends of the filter bag 16 are buckled on the main bag cage 16-12 and the auxiliary bag cage 16-13 through the end covers 16-3, and Venturi tubes 16-4 are provided in the end covers on both sides. The filter bag 16 adopts a double bag head design The design can realize double-head pulse jet cleaning, and the whole filter bag 16 can be thoroughly cleaned. There is no phenomenon that the bottom of the single-bag filter bag 16 is not thoroughly cleaned. The end cover 16-3 buckles the filter bag mouth to protect the bag mouth. The end cover 16 has a built-in venturi 16-4. During pulse cleaning, external cleaning nitrogen is ejected from the nozzle into the venturi 16-4. The nitrogen forms an acceleration effect inside the venturi 16-4, and a slight negative pressure is generated at the mouth of the pipe, which will guide a large amount of airflow in the clean air chamber to flow into the filter bag 16. The accelerated airflow is ejected from the outlet of the venturi 16-4 to reach a farther distance. A large amount of airflow enters the filter bag 16, causing the filter bag 16 to expand instantly and then shrink and shake, and the ash on the outer surface of the filter bag 16 is shaken off into the ash hopper 9.

[0048] like Figure 4-6 As shown, the main bag cage 16-12 and the auxiliary bag cage 16-13 are respectively located at the two ends of the filter bag 16, the main bag cage 16-12 is located inside the filter bag 16, and a sealing sleeve 16-122 is provided at its end. A continuous semicircular ring groove 16-1221 is provided inside the sealing sleeve 16-122, which is located close to the lattice plate 17 on the other side of the filter bag 16. A longitudinal rib 16-5 is horizontally penetrated in the main bag cage 16-12, and an anti-support ring 16-121 is vertically surrounded on the longitudinal rib 16-5. The longitudinal rib 16-5 and the anti-support ring 16-121 support the filter bag 16, and the sealing sleeve 16-122 can cooperate with the clamping ring 16-131 of the auxiliary bag cage 16-13 for sealing.

[0049] A secondary bag cage 16-13 is provided between the main bag cage 16-12 and the other side of the filter bag 16. The secondary bag cage 16-13 includes a transverse longitudinal rib 16-5. A plurality of snap rings 16-131 are provided outside the longitudinal rib 16-5. The snap rings 16-131 are located on the longitudinal rib 16-5 in an arc shape. There is a gap between the ends of the snap rings 16-131. The snap rings 16-131 in each semicircular annular groove 16-1221 are located in a vertical plane. The snap rings 16-131 and the semicircular annular grooves are arranged in a vertical plane. 16-1221 is adapted, when the clamping ring 16-131 is inserted into the sealing sleeve 16-122, as the end cover 16-3 of the auxiliary bag cage 16-13 is pressed, the interval between the clamping rings 16-131 can provide a shrinkage space between the clamping rings 16-131, and the clamping ring 16-131 will be stuck on the appropriate semicircular ring groove 16-1221 inside the sealing sleeve 16-122. At this time, it can be ensured that the two ends of the bag cage 16-1 are tightly fitted with the bag mouth of the filter bag 16 and installed in place.

[0050] The ash hopper 9 is located below the filter bag 16. A manual gate valve 8 and an electric ash discharge valve 7 are provided at the bottom of the ash hopper 9. The ash hopper 9 is used to store dust that falls and settles during pulse cleaning of the filter bag 16. The manual gate valve 8 and the electric ash discharge valve 7 are used to discharge the accumulated dust in the ash hopper 9 out of the ash hopper.

[0051] Dust-laden flue gas flows in from the horizontal guide plate 2 in the variable diameter section 1 of the air inlet. The horizontal guide plate 2 divides and distributes the airflow horizontally, and the flow area is gradually expanded, so that the airflow flows into the filter bag 16 smoothly and evenly. The outlet of the horizontal guide plate 2 is 600mm away from the first row of filter bags 16. The sufficient distance can prevent the flue gas from excessively scouring the first row of filter bags 16; the flue gas flows from the outside of the filter bag 16 to the inside, and the dust is captured on the outer surface of the filter bag 16. The clean flue gas flows into the clean air chamber 14 from both ends of the filter bag 16. At this time, the clean flue gas flow is divided into two paths, flowing from both sides of the dust collector; the clean flue gas flowing into the clean air chamber is After the preliminary horizontal diversion, the airflow is divided into 4 parts and flows to the guide grille 4; the airflow is uniformly fluidized through the guide grille plate 4, and the grille holes are large in size, so the resistance of the component is very small; the flue gas that has been uniformly fluidized flows into the guide arc plate 18, and the arc plate is also mirror-set on both sides of the dust collector, with a total of 5 arc plates on each side. The arc plate further guides the flue gas flowing out of the guide grille 4 to make the flow channel smooth and reduce the resistance loss at the turning point of the flow channel; the clean flue gas flow flowing out of the guide arc plate 18 impacts the duct folding plate 19, and guides the airflow to the outlet diameter reducing section 6 to discharge the equipment. As the running time of the dust collector increases, the filter bag 16 is prevented from adhering to the outside As more and more dust is collected, the resistance value inside and outside the filter bag increases. Nozzle 3-3 is a high-sonic jet nozzle, which has the function of accelerating the blowing airflow. The pulse valve is installed on the blowing bag. Under the control of the solenoid valve, the internal diaphragm of the pulse valve opens instantly, and a large amount of nitrogen is sprayed from the blowing bag into the blowing pipe 3-2, and then sprayed into the filter bag 16 at high speed through the nozzle 3-3. At the same time, a large amount of airflow from the clean air chamber 14 is guided into the filter bag 14, causing the filter bag 16 to expand, shrink and shake instantly. The ash on the outer surface of the filter bag 16 is shaken off into the ash hopper 9, and the influence of secondary dust is not avoided. The pulse cleaning sequence is carried out in the following order: (1) Clean the upper half first Ash: Open the pulse valves on the top four spray bags in sequence for cleaning; (2) Cleaning the rear lower half: Open the pulse valves on the bottom four spray bags in sequence for cleaning; (3) After a round of pulse valve cleaning, when the resistance value inside and outside the filter bag drops to the set value, the equipment continues to be put into use. The dust removed by pulse cleaning falls and settles in the ash hopper 9. When the ash level rises to the upper material position, open the electric ash discharge valve 7 and the manual gate valve 8 in sequence to discharge the accumulated ash in the ash hopper 9. After the ash in the ash hopper is completely discharged, close the electric ash discharge valve 7 and the manual gate valve 8 in sequence, and the equipment continues to be put into use. When the ash level rises to the upper material position again, the ash discharge operation is performed again.

[0052] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention, and the purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and the implementation methods of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. Extra-long double-bag head bag dust collector, including air inlet reducing section and air outlet reducing section located on both sides of the box body and ash hopper located at the bottom, the box body is provided with guide grille and guide arc plate and pulse valve spray system connected with the box body, the box body is provided with grating plate, the pulse valve spray system is composed of spray bag, spray pipe, nozzle and mounting support, characterized in that: The air inlet reducing section and the outlet reducing section are both provided with horizontal guide plates, the box body is provided with guide arc plates and air duct folding plates, each nozzle corresponds to a filter bag, the filter bags are horizontally and vertically arranged in the waste air chamber in the lattice plate, the filter bags are provided with bag cages, and the bag cages include main bag cages and auxiliary bag cages.

2. The super-long double-bag head type bag dust collector according to claim 1 is characterized in that: The plate spacing at the outlet of the horizontal guide plate is larger than that at the inlet. The horizontal guide plate of the air inlet variable diameter section takes the inlet as the radiation source, radiates evenly toward the middle, and is horizontally differentiated and evenly distributed. The flow area gradually expands toward the middle of the box. The part of the horizontal guide plate located at the air outlet variable diameter section is opposite to the air inlet variable diameter section.

3. The super-long double-bag head bag dust collector according to claim 1 is characterized in that: Grid plate platforms are arranged in sequence from bottom to top between the two sides of the grating plate and the box body, a clean air chamber is provided between the grid plate platforms, bag inspection platforms are provided in sequence outside the box body on one side of the clean air chamber, and a maintenance manhole door is also provided on the box body of the side wall of the clean air chamber, and a guide grille is provided between the box body and the grating plate on the side of the grid plate platform close to the air outlet reducing section.

4. The super-long double-bag head bag dust collector according to claim 3 is characterized in that: The guide arc plates are arranged on the outside of the guide grille, that is, between the right-angled outside of the grating plate and the direct inside of the box body, and are generally inwardly curved toward the grating plate. The guide arc plates are placed in a mirror image.

5. The super-long double-bag head bag dust collector according to claim 1 is characterized in that: The duct folding plate is located on one side of the lattice plate close to the outlet diameter reducing section. The duct folding plate is composed of two steel plates with an obtuse angle set toward the outlet diameter reducing section. The upper and lower parts of the duct folding plate are both welded and fixed to the box body.

6. The super-long double-bag head type bag dust collector according to claim 1 is characterized in that: A spray bag maintenance platform is provided on one side of the pulse valve spray system. The spray bag is installed on the upper and lower parts of the box body through a mounting bracket. The spray bag is connected to the spray pipe in sequence. The spray pipe is vertically arranged. Nozzles are provided on the spray pipe in sequence. The nozzle mouth faces the center of the filter bag. A nozzle is provided at both ends of each filter bag.

7. The super-long double-bag head bag dust collector according to claim 1 is characterized in that: The filter bag is in a ring shape with openings at both ends. The two ends of the filter bag openings are wrapped with inwardly recessed concave rings. The concave rings are stainless steel ring sheets. The sizes of the concave rings and the grating plates are mutually adapted. The concave rings achieve a sealing effect with the grating plate holes under the expansion effect. The two ends of the filter bag are buckled on the main bag cage and the auxiliary bag cage through end covers respectively, and Venturi tubes are provided in the end covers on both sides.

8. The super-long double-bag head bag dust collector according to claim 1 is characterized in that: The main bag cage and the auxiliary bag cage are respectively located at the two ends of the filter bag. The main bag cage is located inside the filter bag, and a sealing sleeve is provided at its end. A continuous semicircular ring groove is provided inside the sealing sleeve, and is located close to the grating plate on the other side of the filter bag. Longitudinal ribs are horizontally penetrated in the main bag cage, and a reverse support ring is vertically surrounded on the longitudinal ribs.

9. The super-long double-bag head bag dust collector according to claim 8 is characterized in that: A secondary bag cage is provided between the main bag cage and the other side of the filter bag, and the secondary bag cage includes transverse longitudinal ribs, and a plurality of clamping rings are provided outside the longitudinal ribs. The clamping rings are located on the longitudinal ribs in an arc shape, and there are intervals between the ends of the clamping rings. The clamping rings in each semicircular ring groove are located in a vertical plane, and the clamping rings and the semicircular ring grooves are adapted to each other.

10. The super-long double-bag head bag dust collector according to claim 1 is characterized in that: The ash hopper is located below the filter bag, and a manual plug valve and an electric ash discharge valve are arranged at the bottom of the ash hopper.

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