Chemical raw material combustion tail gas treatment device

Abstract

The invention relates to the field of chemical waste gas treatment, in particular to a chemical raw material combustion tail gas treatment device, counter-acting force generated by high-pressure air flow can be transmitted upwards through a supporting framework in a filter bag and acts on a protective cover at the top of the framework, and the instantaneous and upward impact force is extremely prone to causing temporary separation between the protective cover and a pattern plate; and fine gaps are formed. At the moment, high-concentration dust-containing gas is still contained in the filter cartridge, and the purified gas is contained in the gas purification cavity, so that a pressure difference leakage channel is formed due to the existence of the gap, and the high-concentration dust-containing gas which is not filtered is directly communicated with the gas purification cavity through a short path. The seam between the protective cover and the tubesheet is continuously sealed through the lower-layer area of the annular sealing bag, the outer wall of the protective cover is synchronously coated with the upper-layer area, double sealing is formed, the working conditions that the displacement of the protective cover is increased and the seam is expanded due to abrasion caused by long-term use of the protective cover can be effectively handled, and the sealing performance between the protective cover and the tubesheet is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of chemical waste gas treatment, in particular to a chemical raw material combustion tail gas treatment device. BACKGROUND

[0002] In the industrial production process of chemical industry, metallurgy, electric power and other industries, a large amount of combustion tail gas containing dust will be produced. In order to protect the environment and meet the increasingly strict environmental emission standards, these dust-containing waste gas must be efficiently purified. Bag type dust collector has been widely used in this field due to its high dust removal efficiency and large range of treatment air volume.

[0003] The dust-containing waste gas enters the box through the inlet pipe and is distributed to the plurality of filter cartridges suspended on the flower plate inside. When the waste gas passes through the filter bag, the dust is trapped on the outer surface of the filter bag. As the dust layer on the surface of the filter bag thickens, the system resistance rises, and the filter bag needs to be cleaned regularly to restore its filtering performance. Pulse jet cleaning is the current mainstream cleaning method, which sprays high-pressure compressed air into the filter bag to make the filter bag vibrate and swell, thereby shaking off the dust attached to the outside of the filter bag.

[0004] During the pulse jet cleaning process, the reaction force generated by the high-pressure airflow is transmitted upward through the support skeleton inside the filter cartridge and acts on the protective cover at the top of the skeleton. This instantaneous upward impact force can easily cause the protective cover to separate from the flower plate and form a small gap. Since the filter cartridge is still filled with high-concentration dust-containing gas at this time, and the clean gas cavity is filled with purified gas, the existence of this gap forms a pressure difference leakage channel, causing the high-concentration dust-containing gas that has not been filtered to bypass the filter and directly enter the clean gas cavity, resulting in a temporary exceedance of the emission concentration and severely affecting the overall dust removal efficiency. SUMMARY

[0005] The present application aims to provide a chemical raw material combustion tail gas treatment device to solve the problems raised in the background art. To achieve the above-mentioned purpose, the present application provides the following technical solution: a chemical raw material combustion tail gas treatment device, comprising a filter dust prevention assembly, which is arranged in a filter device in the waste gas filtration and treatment process. The filter device is, for example, a box, and two filter cartridges are arranged side by side inside the box. The top of the filter cartridge is fixedly connected to the box through a flower plate, and a closed clean gas cavity is formed between the flower plate and the inner top wall of the box. Each filter cartridge is provided with a filter bag and a skeleton for supporting the filter bag. The top of the skeleton is provided with a protective cover, which covers the corresponding mounting hole of the flower plate to form a preliminary seal.

[0006] The filter dust prevention assembly is installed in the clean gas cavity above the protective cover and is stably limited on the flower plate by applying a downward restraining force, preventing the skeleton and its protective cover from separating from the flower plate due to the backwash effect during pulse cleaning.

[0007] Preferably, the filter dustproof assembly comprises a support plate adjustably and slidably arranged in the clean air cavity, an outer shell in the form of a ring is fixedly arranged on the support plate, a plurality of compression rods are uniformly arranged on the inner top wall of the outer shell in the circumferential direction, a ventilation cover is connected to the bottom ends of the compression rods, the ventilation cover is in the form of a cone, and a through hole is formed in the ventilation cover and the corresponding position of the outer shell, thereby forming a channel for the pulse spraying of compressed air.

[0008] Preferably, the bottom of the outer shell is fixedly connected with a ring-shaped support, an opening is arranged at the center of the ring-shaped support, the opening is arranged on the outer side of the protective cover in the circumferential direction, a ring-shaped sealing capsule is embedded in the opening, a ring-shaped spring is arranged at the mounting position of the ring-shaped sealing capsule, the ring-shaped sealing capsule is divided into an upper region and a lower region in the radial direction, the upper region is in contact with the ring-shaped spring, and a plurality of extrusion sealing portions are distributed on the ring-shaped support in the circumferential direction, and each extrusion sealing portion is in transmission connection with the ventilation cover above.

[0009] Preferably, the extrusion sealing portion comprises an L-shaped folding plate connected to the outer edge of the ventilation cover through a pin shaft, the folding plate is connected to the pin shaft through a torsional spring, the inner wall of the outer shell is provided with an inclined guide slope, and one end of the folding plate extends to the inner side of the guide slope, so that the folding plate is guided to rotate around the pin shaft when the ventilation cover moves axially relative to the outer shell.

[0010] Preferably, the ring-shaped support is provided with a guide groove arranged in the transverse and axial directions, an arc-shaped groove extends outward from the outer side of the guide groove, two guide rollers are arranged on the push plate and roll along the guide groove and the arc-shaped groove, and the push plate is further fixedly connected with an inclined block, a clamping frame is slidably arranged on the ring-shaped support, the ring-shaped spring is covered in the clamping frame, and the clamping frame is in extrusion fit with the inclined surface of the inclined block.

[0011] Compared with the prior art, the present application has the following beneficial effects:

[0012] In the present application, the ventilation cover continuously applies a downward restraining force under the elastic action of the compression rods, so that the protective cover at the top of the framework is stably pressed against the screen surface, thereby preventing the high-concentration dust-containing gas in the filter cartridge from leaking to the clean air cavity through the gap between the protective cover and the screen.

[0013] In the present application, the ventilation cover and the outer shell are relatively displaced, the folding plate is deflected towards the ring-shaped sealing capsule under the guidance of the slope, the sliding roller at the other end of the folding plate rolls in the limiting groove of the push plate, thereby causing the push frame to extrude the lower region of the ring-shaped sealing capsule and make it gather towards the joint between the protective cover and the screen, in the process, the upper region of the ring-shaped sealing capsule is kept stable under the constraint of the ring-shaped spring, thereby ensuring that the sealing action is concentrated on the lower region and effectively blocking the leakage path of the dust-containing gas.

[0014] In the application, the lower area of the annular sealing bag continues to seal the joint between the protective cover and the flower plate, and the upper area synchronously covers the outer wall of the protective cover, forming double sealing, which can effectively deal with the working condition that the displacement of the protective cover increases and the gap expands due to the wear of the protective cover for a long time, and improves the sealing performance between the protective cover and the flower plate. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a top view of the exhaust gas filtering treatment process of the application;

[0016] Figure 2 It is a front view of the exhaust gas filtering treatment process of the application;

[0017] Figure 3 It is a perspective structural schematic view of the filter cartridge, the pulse blowing pipeline and the filtering and dustproof assembly in the application;

[0018] Figure 4 It is a perspective structural schematic view of the framework, the protective cover and the filtering and dustproof assembly in the application;

[0019] Figure 5 It is a partial perspective structural schematic view of the filtering and dustproof assembly in the application Figure 1 ;

[0020] Figure 6 It is a partial perspective structural schematic view of the filtering and dustproof assembly in the application Figure 2 ;

[0021] Figure 7 It is a plan view of the extrusion sealing part and the breather cover in the application;

[0022] Figure 8 It is a perspective structural schematic view of the annular sealing bag and the extrusion sealing part in the application;

[0023] Figure 9 It is a perspective structural schematic view of the annular sealing bag and the annular spring in the application;

[0024] Figure 10 It is a front view of the annular sealing bag, the annular spring and the extrusion sealing part in the application;

[0025] Figure 11 It is a partial perspective structural schematic view of the extrusion sealing part in the application Figure 1 ;

[0026] Figure 12 It is a partial perspective structural schematic view of the extrusion sealing part in the application Figure 2 .

[0027] In the diagram: 1. Housing; 11. Filter cartridge; 12. Inlet pipe; 13. Electric regulating valve; 14. Tube plate; 15. Clean air chamber; 16. Exhaust pipe; 17. Pulse jet pipe; 18. Filter bag; 19. Frame; 110. Protective cover; 2. Filter dustproof assembly; 21. Support plate; 22. Outer shell; 23. Compression rod; 24. Ventilation hood; 25. Annular bracket; 26. Opening; 27. Annular sealing bladder; 271. Upper area; 272. Lower area; 28. Annular spring; 3. Compression sealing part; 31. Folding plate; 32. Guide ramp; 33. Push plate; 34. Limiting groove; 35. Sliding roller; 36. Push frame; 37. Guide groove; 38. Arc groove; 39. Guide roller; 310. Inclined block; 311. Mounting frame. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Example 1

[0030] Please see Figures 1 to 12 The present invention provides a technical solution: a chemical raw material combustion exhaust gas treatment device, including a filter dust prevention component 2, which is installed in a filter device in the waste gas filtration treatment process. The filter device is, for example, a box 1. Two filter cylinders 11 are arranged side by side inside the box 1. An air inlet pipe 12 is connected to the side wall of the box 1. The air inlet pipe 12 is connected to the bottom interface of the corresponding filter cylinder 11 through two branches. Each branch is equipped with an electric regulating valve 13. The two filter cylinders 11 are operated alternately by controlling the opening and closing of the electric regulating valve 13.

[0031] The top of the filter cylinder 11 is fixedly connected to the housing 1 via a perforated plate 14. A sealed clean air chamber 15 is formed between the perforated plate 14 and the inner top wall of the housing 1. An exhaust pipe 16 communicating with the clean air chamber 15 is provided on the outer wall of the housing 1. A pulse jet pipe 17 is provided at the top of the housing 1 corresponding to the center position of each filter cylinder 11.

[0032] Each filter cartridge 11 is provided with a filter bag 18 and a frame 19 for supporting the filter bag 18. The top of the frame 19 is provided with a protective cover 110, which covers the corresponding mounting hole on the tube sheet 14 to form a preliminary seal.

[0033] The dust-containing exhaust gas enters one of the filter cartridges 11 through the air inlet pipe 12, the dust is intercepted after being filtered by the filter bag 18, the purified gas enters the clean gas cavity 15 through the flower plate 14, and finally is discharged through the air outlet pipe 16. Through the switching control of the electric regulating valve 13, the alternate operation of the two filter cartridges 11 is realized, and the continuity of the exhaust gas treatment process is ensured.

[0034] The filter dustproof assembly 2 of the present disclosure is installed in the clean gas cavity 15 and above the protective cover 110, and by applying a downward restraining force, the protective cover 110 and the skeleton 19 are stably limited on the flower plate 14, preventing the skeleton 19 and the protective cover 110 from being separated from the flower plate 14 due to the backwash effect during the pulse cleaning process.

[0035] In the actual working process of the exhaust gas filtration treatment process, when removing the pollutants accumulated on the surface of the filter bag 18, the pulse blowing pipe 17 sprays compressed air into the filter bag 18. At the moment of pulse cleaning, the compressed air vertically impacts the filter bag 18 downward, and the backwash force is transmitted upward through the skeleton 19 and acts on the protective cover 110, resulting in a temporary gap between the protective cover 110 and the flower plate 14. The filter dustproof assembly 2 of the present disclosure maintains the effective sealing between the flower plate 14 and the protective cover 110 during this process, preventing the high-concentration dust-containing gas in the filter cartridge 11 from entering the clean gas cavity 15 through the gap, thereby ensuring that the exhaust gas emission concentration meets the environmental protection standards.

[0036] Specifically, the filter dustproof assembly 2 includes a support plate 21 adjustably and slidably arranged in the clean gas cavity 15, and an outer shell 22 in the form of a ring is fixedly installed on the support plate 21. The inner top wall of the outer shell 22 is uniformly arranged with a plurality of compression rods 23 in the circumferential direction. The bottom ends of the compression rods 23 are connected with a ventilation cover 24. The compression rods 23 are springs or pneumatic damping rods. The ventilation cover 24 is in the form of a cone, and the ventilation cover 24 and the outer shell 22 are respectively provided with through holes at the corresponding positions, forming a channel for pulse blowing compressed air.

[0037] The ventilation cover 24 continuously applies a downward restraining force to the protective cover 110 at the top of the skeleton 19 and stably presses it against the surface of the flower plate 14 under the elastic action of the compression rods 23, preventing the high-concentration dust-containing gas in the filter cartridge 11 from leaking to the clean gas cavity 15 through the gap between the protective cover 110 and the flower plate 14.

[0038] At the same time, the conical inner surface of the ventilation cover 24 is in contact with the outer edge of the top of the protective cover 110, and after the pulse blowing operation, it can guide the protective cover 110 and the skeleton 19 to automatically reset to the center position of the filter bag 18, ensuring that the filter bag 18 is not affected by the bias and maintaining its normal filtering form.

[0039] The bottom of the outer shell 22 is fixedly connected with an annular support 25, the center of the annular support 25 is provided with an opening 26, the opening 26 is correspondingly arranged on the circumferential outer side of the protective cover 110, the opening 26 is embedded with an annular sealing bag 27, the mounting position of the annular sealing bag 27 is provided with an annular spring 28, the annular sealing bag 27 is radially divided into an upper layer area 271 and a lower layer area 272, wherein the upper layer area 271 is in contact with the annular spring 28, a plurality of extrusion sealing parts 3 are distributed on the annular support 25 in the circumferential direction, and each extrusion sealing part 3 is in transmission connection with the upper air vent cover 24;

[0040] The annular sealing bag 27 is a hollow annular bag body made of elastic rubber material, and the inside can be filled with air or flexible foam material;

[0041] During pulse blowing operation, the protective cover 110 is axially displaced by air flow backwash and pushes the air vent cover 24 to move upward, the air vent cover 24 synchronously drives each extrusion sealing part 3 to move towards the center, and the radial extrusion force is applied to the annular sealing bag 27, so that the annular sealing bag 27 is tightly pressed against the outer wall of the protective cover 110, forming a dynamic seal;

[0042] In the initial state, the opening 26 of the annular support 25 surrounds the circumferential outer side of the protective cover 110, when the protective cover 110 moves upward due to pulse blowing, the air vent cover 24 moves upward and compresses the compression rod 23, and at the same time, the annular sealing bag 27 is tightly pressed against the outer wall of the protective cover 110 through the extrusion sealing part 3, realizing sealing and limiting of the outside of the protective cover 110.

[0043] In the embodiment, the extrusion sealing part 3 includes an L-shaped folded plate 31 connected to the outer edge of the air vent cover 24 through a pin shaft, the folded plate 31 is connected to the pin shaft through a torsional spring, the inner wall of the outer shell 22 is provided with an inclined guide slope 32, one end of the folded plate 31 extends to the inner side of the guide slope 32, when the air vent cover 24 moves axially relative to the outer shell 22, the folded plate 31 rotates around the pin shaft under the guidance of the slope;

[0044] The top of the annular support 25 is slidably connected with a push plate 33, the push plate 33 is provided with an axially arranged limiting groove 34, the end of the folded plate 31 away from the slope is provided with a sliding roller 35, the sliding roller 35 is embedded in the limiting groove 34 and can roll along the limiting groove 34, the outer wall of the push plate 33 is hingedly connected with a push support 36, the push support 36 is correspondingly arranged on the lower layer area 272 of the annular sealing bag 27;

[0045] When the protective cover 110 is moved upward by the pulse blowing and abuts against the air cover 24, the air cover 24 and the outer cover 22 are relatively displaced, the folding plate 31 is deflected toward the annular sealing bag 27 under the guidance of the slope, the sliding roller 35 at the other end rolls in the limiting groove 34 of the push plate 33, and then the push frame 36 extrudes the lower area 272 of the annular sealing bag 27, so that the lower area 272 is gathered to the joint between the protective cover 110 and the flower plate 14, and the upper area 271 of the annular sealing bag 27 is kept stable under the constraint of the annular spring 28, so that the sealing effect is concentrated on the lower area 272, and the dust-containing gas leakage path is effectively blocked.

[0046] In the embodiment, the annular support 25 is provided with a guide groove 37 arranged in the transverse and axial directions, the outer side of the guide groove 37 extends an arc-shaped groove 38, the push plate 33 is provided with two guide rollers 39, the two guide rollers 39 roll along the guide groove 37 and the arc-shaped groove 38, and the push plate 33 is further fixedly connected with an inclined block 310, and the annular support 25 is slidably provided with an embedded frame 311, the embedded frame 311 covers the annular spring 28, and is in extrusion fit with the inclined surface of the inclined block 310.

[0047] In the pulse blowing operation, when the axial displacement of the protective cover 110 caused by the air flow backflow increases, the push plate 33 first extrudes the lower area 272 of the annular sealing bag 27 through the push frame 36, so that the initial gap between the protective cover 110 and the flower plate 14 is sealed, and as the equipment is operated for a long time, the rebound of the elastic sealing gasket between the protective cover 110 and the flower plate 14 is slow in the pulse blowing process, and the protective cover 110 is abraded, so that the axial displacement of the protective cover 110 relative to the outer cover 22 further increases, and the gap is expanded, and the original sealing effect is weakened.

[0048] At this time, as the push plate 33 continues to move, one of the guide rollers 39 moves to the end of the guide groove 37, and the other guide roller 39 is deflected and moves along the arc-shaped groove 38, so that the push plate 33 is deflected as a whole, the inclined block 310 on the push plate 33 extrudes the embedded frame 311, the embedded frame 311 is driven to move outwardly relative to the annular spring 28, and the upper area 271 of the annular sealing bag 27 is expanded outwardly to cover the outer wall of the protective cover 110 as a whole.

[0049] The lower area 272 of the annular sealing bag 27 continues to seal the joint between the protective cover 110 and the flower plate 14, and the upper area 271 of the annular sealing bag 271 synchronously covers the outer wall of the protective cover 110, so that double sealing is formed, the working condition that the displacement of the protective cover 110 increases and the gap expands due to the abrasion of the protective cover 110 caused by long-term use is effectively coped with, and the sealing performance between the protective cover 110 and the flower plate 14 is improved.

[0050] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only preferred examples of the present application and are not intended to limit the present application. Various changes and improvements can be made to the present application without departing from the spirit and scope of the present application, and such changes and improvements fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A chemical raw material combustion exhaust gas treatment device, characterized in that, include: Box (1); Two filter cartridges (11) are arranged side by side inside the housing (1); The tube sheet (14) is fixedly connected to the box body (1) and forms a clean air chamber (15) between it and the inner top wall of the filter cylinder (11). The filter dustproof assembly (2) is installed inside the clean air chamber (15); The filter dustproof assembly (2) includes a support plate (21) that is adjustable and slidably disposed in the clean air chamber (15); The outer casing (22) is fixedly installed on the support plate (21) and arranged in a ring shape; Compression rods (23) are evenly arranged circumferentially on the inner top wall of the outer casing (22); A ventilation hood (24) is connected to the bottom end of the compression rod (23) and is set in a conical shape; The ventilation hood (24) and the outer casing (22) are respectively provided with through holes to form a channel for pulse jet compressed air.

2. The chemical raw material combustion tail gas treatment device according to claim 1, characterized in that: Also includes: A filter bag (18) is disposed inside the filter cylinder (11); The frame (19) is set inside the filter cylinder (11) and is used to support the filter bag (18). A protective cover (110) is provided on the top of the frame (19) and covers the corresponding mounting holes on the flower plate (14); The ventilation hood (24) applies a downward constraint force under the elastic action of the compression rod (23), which stably presses the protective cover (110) onto the surface of the tube sheet (14).

3. The chemical raw material combustion tail gas treatment device according to claim 2, characterized in that: The filter and dustproof assembly (2) also includes: A ring-shaped bracket (25) is fixedly connected to the bottom of the outer casing (22); An opening (26) is located at the center of the annular support (25) and corresponds to the circumferential outer side of the protective cover (110); An annular sealing bladder (27) is fitted into the opening (26); A ring spring (28) is provided at the mounting position of the annular sealing bladder (27); Multiple compression sealing parts (3) are distributed circumferentially on the annular bracket (25) and are linked to the vent hood (24) above.

4. The chemical raw material combustion tail gas treatment device according to claim 3, characterized in that: The annular sealing bladder (27) is radially divided into an upper region (271) and a lower region (272), wherein the upper region (271) is in contact with the annular spring (28).

5. The chemical raw material combustion tail gas treatment device according to claim 3, characterized in that: The compression sealing part (3) includes: The folding plate (31) is connected to the outer edge of the ventilator (24) by a pin and is arranged in an L-shape; A guide ramp (32) is provided on the inner wall of the outer casing (22) and is inclined. One end of the folding plate (31) extends to the inside of the guide ramp (32). When the vent hood (24) moves axially relative to the outer shell (22), the folding plate (31) is guided by the guide ramp (32) to rotate around the pin.

6. The chemical raw material combustion tail gas treatment device according to claim 5, characterized in that: The compression sealing part (3) further includes: The push plate (33) is slidably connected to the top of the annular bracket (25); A limiting groove (34) is provided on the push plate (33); A sliding roller (35) is located at one end of the folding plate (31) away from the guide slope (32) and is fitted into the limiting groove (34); The pusher (36) is hinged to the outer wall of the pusher plate (33) and is correspondingly disposed in the lower region (272) of the annular sealing bladder (27).

7. The chemical raw material combustion tail gas treatment device according to claim 6, characterized in that: Also includes: The guide groove (37) is provided on the annular bracket (25); An arc-shaped groove (38) extends to the outside of the guide groove (37); Two guide rollers (39) are mounted on the push plate (33) and roll along the guide groove (37) and the arc groove (38); The inclined block (310) is fixedly connected to the push plate (33); The mounting bracket (311) is slidably mounted on the annular bracket (25) and encloses the annular spring (28) inside, and is pressed against the inclined surface of the inclined block (310).

8. The chemical raw material combustion tail gas treatment device according to claim 1, characterized in that: Also includes: The air intake pipe (12) is connected to the side wall of the housing (1) and is connected to the bottom interface of the corresponding filter cartridge (11) through two branches respectively; Electric regulating valves (13) are installed on each branch; An exhaust pipe (16) is located on the outer wall of the housing (1) and is connected to the clean air chamber (15); The pulse jet pipe (17) is located at the top of the housing (1) and corresponds to the center of the filter cartridge (11).

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