Split-ranging type tail gas dust removal filter

Abstract

The utility model relates to the technical field of chemical engineering, in particular to a split-ranging type tail gas dust removal filter which comprises a dust removal filter chamber, a gas back-blowing chamber and a pore plate, the gas back-blowing chamber comprises an upper shell and a gas back-blowing device, the upper end of the upper shell is provided with a tail gas outlet, and the lower end of the upper shell is provided with a third flange in sealed connection with the pore plate. A partition plate is vertically arranged in the middle of an inner cavity of the upper shell, the partition plate divides the inner cavity of the upper shell into two independent blowback cavities, and the gas blowback devices are arranged in the two blowback cavities respectively. According to the utility model, the gas back-blowing chamber is divided into the two back-blowing chambers through the partition plate, and when the filter pipe is blocked, the gas back-blowing devices on the single sides are sequentially opened to respectively carry out back-blowing cleaning on the filter pipe, so that the situation that the whole production system needs to be stopped due to pressure building caused by gas blowing due to the blockage of the filter pipe is effectively avoided, and the working efficiency of the production system is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical industry, in particular to a split-stage tail gas dust removal filter. Background Art

[0002] In the chemical production industry, a large amount of industrial exhaust gas is often generated. These exhaust gases not only contain pungent odors, but also contain a large amount of particulate dust, which not only destroys the production environment of the enterprise, but also has a serious impact on the lives of surrounding residents, and even harms the atmospheric environment. Therefore, production enterprises will use dust removal filters to filter and collect dust entrained in the exhaust gas before the industrial exhaust gas is discharged. The existing exhaust gas dust removal filter mainly adopts the form of orifice plate and flange welding. After the filter tube is installed on the orifice plate, the staff cannot see the situation under the orifice plate, which is not convenient for the installation, disassembly and inspection and maintenance of the internal parts of the exhaust gas dust removal filter. In addition, the dust removal filter is a single back-blowing chamber filter. If the filter tube is blocked, it is necessary to stop the operation of the entire production system, and the filter tube must be back-blown with gas before continuing production, which affects the continuous operation of the production system.

[0003] Therefore, it is urgent to design a split-stage exhaust dust removal filter that is convenient for the installation, disassembly, inspection and maintenance of the internal components of the exhaust dust removal filter while ensuring the sealing and filtering effects, and at the same time, can directly and regularly perform gas backblowing of the filter tube without stopping the production system. Utility Model Content

[0004] In order to overcome the problems existing in the related art, the utility model discloses a split-stage tail gas dust removal filter, comprising: a dust removal filter chamber, a gas backflush chamber and a perforated plate arranged between the dust removal filter chamber and the gas backflush chamber, wherein:

[0005] The dust removal and filtering chamber comprises a lower shell and a plurality of filter tubes arranged in the inner cavity of the lower shell, the lower end of the lower shell is provided with a first flange sealedly connected to the reaction device, and the upper end of the lower shell is provided with a second flange sealedly connected to the orifice plate;

[0006] The gas backflush chamber comprises an upper shell and a gas backflush device arranged in the inner cavity of the upper shell, the upper end of the upper shell is provided with an exhaust gas outlet, the lower end of the upper shell is provided with a third flange sealed and connected to the orifice plate, a partition is vertically arranged in the center of the inner cavity of the upper shell, the partition divides the inner cavity of the upper shell into two separate backflush chambers, and the gas backflush devices are respectively arranged in the two backflush chambers;

[0007] The orifice plate is provided with a plurality of through holes matched with the sizes of the filter tubes, and the plurality of filter tubes pass through the through holes and are fixed to the orifice plate.

[0008] Furthermore, the gas blowback chamber also includes a pressing plate arranged above the plurality of filter tubes, and a partition groove matched with the partition is provided on the upper surface of the pressing plate.

[0009] Furthermore, a circle of first annular grooves is provided on the upper surface of the orifice plate near the edge, and a circle of first raised retaining rings is provided on the lower surface of the orifice plate near the edge.

[0010] Furthermore, a second annular groove matched with the first protruding snap ring is provided near the edge of the upper end surface of the second flange, and a second protruding snap ring matched with the first annular groove is provided on the lower surface of the third flange.

[0011] Furthermore, sealing rings are provided in the first annular groove and the second annular groove.

[0012] Furthermore, a first pressure gauge interface communicating with the inner cavity thereof is provided on the side of the lower shell, and a second pressure gauge interface communicating with the inner cavity thereof is provided on the side of the upper shell, and pressure gauges are provided on both the first pressure gauge interface and the second pressure gauge interface.

[0013] Furthermore, there are two exhaust gas outlets, which are respectively arranged above the two back-blowing chambers.

[0014] Furthermore, the gas backflush device comprises a backflush interface arranged on the upper shell, the backflush interface is provided with a backflush pipe extending into the backflush chamber, and the backflush pipe is provided with a plurality of backflush nozzles.

[0015] Furthermore, the back-blowing nozzle comprises a nozzle, a gasket and a nozzle, the gasket is located between the nozzle and the nozzle, and the nozzle is threadedly connected to the nozzle.

[0016] Furthermore, the gas passage of the nozzle includes a first equal diameter section, a conical contraction section and a second equal diameter section connected in sequence, and the gas passage of the nozzle includes a third equal diameter section and a conical expansion section connected in sequence, and the diameter of the second equal diameter section is larger than that of the third equal diameter section.

[0017] Compared with the prior art, the split-stage exhaust dust removal filter of the utility model has the following beneficial effects:

[0018] (1) The utility model divides the gas back-blowing chamber into two back-blowing chambers by a partition, and a gas back-blowing device is arranged in each back-blowing chamber. When the filter tube is blocked, the single-side gas back-blowing device is opened successively to back-blow and clean the filter tube respectively, effectively avoiding the whole production system from stopping operation due to the pressure build-up caused by gas purge caused by the blockage of the filter tube, ensuring the continuous operation of the reaction equipment and improving the working efficiency of the whole production system. At the same time, during the back-blowing process, the tail gas dust containing a large amount of reaction raw materials is also blown off and collected in a centralized manner, saving production costs and avoiding the waste of raw materials.

[0019] (2) The utility model fixes the filter tube passing through the orifice plate by setting a pressure plate, and realizes fixed installation with the partition by setting a partition groove on its upper surface. The structure is simple and practical, which is convenient for the staff to install, disassemble and inspect and maintain the internal parts of the exhaust dust removal filter, and is worthy of promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the overall cross-sectional structure of a split-stage exhaust dust removal filter;

[0022] Figure 2 It is a schematic diagram of the partially enlarged structure of point A of the split-stage exhaust dust removal filter.

[0023] Wherein: 1-dust removal filter chamber, 11-lower shell, 110-first pressure gauge interface, 12-filter tube, 120-filter tube flange, 121-gasket, 13-first flange, 130-second annular groove, 14-second flange, 2-gas backflush chamber, 21-upper shell, 210-second pressure gauge interface, 211-backflush interface, 212-backflush tube, 213-backflush nozzle, 2130-nozzle, 2131-gasket, 2132-nozzle, 23-exhaust gas outlet, 24-third flange, 240-second raised snap ring, 25-partition, 26-backflush chamber, 27-pressing plate, 270-partition groove, 271-bolt, 3-orifice plate, 31-through hole, 32-first annular groove, 33-first raised snap ring, 34-sealing ring. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the utility model.

[0025] like Figure 1 to Figure 2 As shown, the utility model provides a split-stage exhaust dust removal filter, comprising: a dust removal filter chamber 1, a gas backflush chamber 2 and a perforated plate 3 arranged between the dust removal filter chamber 1 and the gas backflush chamber 2, wherein:

[0026] The dust removal and filtering chamber 1 comprises a lower shell 11 and a plurality of filter tubes 12 arranged in the inner cavity of the lower shell 11. The lower end of the lower shell 11 is provided with a first flange 13 which is sealedly connected to the reaction device, and the upper end of the lower shell 11 is provided with a second flange 14 which is sealedly connected to the orifice plate 3.

[0027] The gas blowback chamber 2 comprises an upper shell 21 and a gas blowback device 22 arranged in the inner cavity of the upper shell 21. An exhaust gas outlet 23 is arranged at the upper end of the upper shell 21, and a third flange 24 sealed and connected to the orifice plate 3 is arranged at the lower end of the upper shell 21. A partition plate 25 is vertically arranged in the center of the inner cavity of the upper shell 21. The partition plate 25 divides the inner cavity of the upper shell 21 into two separate blowback chambers 26. The gas blowback devices 22 are respectively arranged in the two blowback chambers 26.

[0028] The orifice plate 3 is provided with a plurality of through holes 31 whose sizes match those of the filter tubes 12 , and the plurality of filter tubes 12 pass through the through holes 31 and are fixed to the orifice plate 3 .

[0029] The utility model dust removal filter chamber 1 and the gas backflush chamber 2 are fixedly connected by upper and lower sealing bolts through the second flange 14 and the third flange 24, and the orifice plate 3 is clamped therebetween. The lower end of the first flange 13 is provided with an exhaust gas inlet, and the outer side wall of the filter tube 12 is provided with a plurality of evenly distributed small air outlet holes. The exhaust gas generated in the reaction equipment enters the filter tube 12 upward through the exhaust gas inlet, and is discharged through the exhaust gas outlet after the filtering is completed. The filtered exhaust gas dust is partially adsorbed on the filter tube 12, and partially settles in the lower shell 11. The utility model divides the gas back-blowing chamber 2 into two back-blowing chambers 26 by setting a partition 5, and each back-blowing chamber 26 is provided with a gas back-blowing device 22. When the filter tube 12 is not well ventilated, the production system does not need to stop running. The gas back-blowing device 22 on this side is turned on, and the back-blowing gas back-blowing cleans the filter tube 12 through the path of "the back-blowing chamber 26 on this side-dust removal filter chamber 1-the back-blowing chamber 26 on the opposite side". The back-blowing path forms a series structure of two back-blowing chambers 26. After back-blowing on this side for a period of time, the gas back-blowing device 22 on this side is turned off, and the gas back-blowing device 22 on the opposite side is turned on to back-blow the filter tube 12 below it. This split-stage operation effectively avoids stopping the entire production system due to the pressure caused by gas purge due to the blockage of the filter tube, ensuring the continuous operation of the reaction equipment and improving the working efficiency of the entire production system. At the same time, during the back-blowing process, the tail gas dust containing a large amount of reaction raw materials is also blown off and then collected, saving production costs and avoiding the waste of raw materials.

[0030] Specifically, Figure 1 to Figure 2As shown, in this embodiment, the gas back-blowing chamber 2 also includes a pressing plate 27 arranged above a plurality of filter tubes 12, and a partition groove 270 adapted to the partition 25 is provided on the upper surface of the pressing plate 27. In this embodiment, the upper end of the partition 5 is welded and fixed to the inner surface of the top end of the upper shell 21, and the lower end of the partition 25 is inserted into the partition groove 270 on the upper surface of the pressing plate 27, and the upper end of the filter tube 12 is provided with a filter tube flange 120. Preferably, a gasket can be placed between the partition 5 and the partition groove 270, and the gasket is made of modified polytetrafluoroethylene. On the one hand, it can prevent the hard collision between the partition 5 and the pressing plate, and on the other hand, it can also prevent the gas from flowing between the two back-blowing chambers 26 due to poor sealing, which affects the back-blowing cleaning effect. In actual use, the staff first passes the plurality of filter tubes 12 through the orifice plate 3, and then the filter tube flange 120 is clamped on the upper surface of the orifice plate 3, and then the pressing plate 27 is covered on the filter tube flange 120, and the filter tube 12 is installed. Preferably, in order to make the filter tube 12 more stable during the production process, the periphery of the pressure plate 27 can be connected to the orifice plate by bolts 271, which is not limited here. Preferably, a gasket 121 is placed between the filter tube flange 120 and the orifice plate 3, which prevents both poor sealing and damage to the filter tube flange and the orifice plate 3 due to the rigid connection. The utility model fixes the filter tube 12 passing through the orifice plate 3 by setting a pressure plate 27, and realizes fixed installation with the partition plate 25 by setting a partition groove 270 on its upper surface. The structure is simple and practical, which is convenient for the staff to install, disassemble and inspect and repair the internal parts of the exhaust dust removal filter, and is worthy of promotion.

[0031] Specifically, Figure 1 to Figure 2 As shown, in this embodiment, a circle of first annular grooves 32 are provided on the upper surface of the orifice plate 3 near the edge, and a circle of first protruding snap rings 33 are provided on the lower surface of the orifice plate 3 near the edge.

[0032] Specifically, Figure 1 to Figure 2 As shown, in this embodiment, the upper end surface of the second flange 14 is provided with a second annular groove 130 matched with the first protruding snap ring 33 near the edge, and the lower surface of the third flange 24 is provided with a second protruding snap ring 240 matched with the first annular groove 32. In order to ensure the sealing of the connection between the dust removal filter chamber, the orifice plate and the gas backflush chamber, in this embodiment, the second protruding snap ring 240 is inserted into the first annular groove 32, and the first protruding snap ring 33 is inserted into the second annular groove 130, so as to achieve a sealed connection between the three.

[0033] Specifically, Figure 2 As shown, in this embodiment, a sealing ring 34 is provided in each of the first annular groove 32 and the second annular groove 130. In this embodiment, the provision of the sealing ring 34 effectively reduces the bolt tightening force and sealing force required for the connection between the second flange 14 and the third flange 24, making it easier for the staff to install, disassemble, inspect and maintain the parts in the exhaust dust removal filter.

[0034] Specifically, Figure 1 to Figure 2 As shown, in this embodiment, the side of the lower shell 11 is provided with a first pressure gauge interface 110 communicating with its inner cavity, and the side of the upper shell 21 is provided with a second pressure gauge interface 210 communicating with its inner cavity, and pressure gauges (not shown in the figure) are provided on the first pressure gauge interface 110 and the second pressure gauge interface 210. Preferably, the pressure gauges in this embodiment are digital pressure gauges. When the filter tube is not blocked, the two pressure gauges have a stable pressure difference; when the filter tube 12 is blocked, the pressure difference between the two pressure gauges will increase, and the on-site staff can roughly evaluate the blockage of the filter tube 12 by observing the pressure count value.

[0035] Specifically, Figure 1 As shown, in this embodiment, there are two tail gas outlets 23 , which are respectively arranged above the two back-blowing chambers 26 .

[0036] Specifically, Figure 1 to Figure 2 As shown, in this embodiment, the gas backflush device 22 includes a backflush interface 211 disposed on the upper housing 21, a backflush pipe 212 extending into the backflush chamber 26 is disposed on the backflush interface 211, and a plurality of backflush nozzles 213 are disposed on the backflush pipe 212. In this embodiment, the number of the backflush nozzles 213 is the same as the number of the filter tubes 12, and they are respectively disposed above the filter tubes 12. The backflush interface 211 is connected to the gas input device, and in this embodiment, nitrogen is selected, which is cheap and not easy to react with the tail gas.

[0037] Specifically, Figure 1 to Figure 2 As shown, the back-blowing nozzle 213 in this embodiment includes a nozzle 2130, a gasket 2131 and a nozzle 2132, the gasket 2131 is located between the nozzle 2130 and the nozzle 2132, and the nozzle 2130 is threadedly connected to the nozzle 2132. In this embodiment, the split design structure of the back-blowing nozzle 213 is easy to manufacture and convenient to replace nozzles 2132 of different forms.

[0038] Specifically, Figure 2As shown, the gas passage of the nozzle 2130 in this embodiment includes a first equal diameter section, a conical contraction section, and a second equal diameter section connected in sequence, and the gas passage of the nozzle 2132 includes a third equal diameter section and a conical expansion section connected in sequence, and the diameter of the second equal diameter section is larger than that of the third equal diameter section. In this embodiment, after the gas passes through the gas passage in the form of multiple sections of the back-blowing nozzle 213, the flow rate will increase relatively smoothly, which is not easy to cause the vibration of the back-blowing nozzle 213, and is also conducive to strong cleaning of the filter tube 12. The above further describes the utility model with the help of specific embodiments, but it should be noted that the specific description here should not be understood as a limitation on the essence and scope of the utility model. Various modifications made to the above embodiments by ordinary technicians in this field after reading this specification are all within the scope of protection of the utility model.

Claims

1. A split-stage exhaust dust removal filter, characterized in that: include: A dust removal filter chamber (1), a gas backflush chamber (2), and a perforated plate (3) arranged between the dust removal filter chamber (1) and the gas backflush chamber (2), wherein: The dust removal filter chamber (1) comprises a lower shell (11) and a plurality of filter tubes (12) arranged in the inner cavity of the lower shell (11); the lower end of the lower shell (11) is provided with a first flange (13) sealedly connected to the reaction equipment, and the upper end of the lower shell (11) is provided with a second flange (14) sealedly connected to the orifice plate (3); The gas backflush chamber (2) comprises an upper shell (21) and a gas backflush device (22) arranged in the inner cavity of the upper shell (21); an exhaust gas outlet (23) is arranged at the upper end of the upper shell (21); a third flange (24) sealed and connected to the orifice plate (3) is arranged at the lower end of the upper shell (21); a partition plate (25) is vertically arranged in the center of the inner cavity of the upper shell (21); the partition plate (25) divides the inner cavity of the upper shell (21) into two separate backflush chambers (26); and the gas backflush device (22) is respectively arranged in the two backflush chambers (26); The orifice plate (3) is provided with a plurality of through holes (31) whose sizes match those of the filter tubes (12); the plurality of filter tubes (12) pass through the through holes (31) and are fixed to the orifice plate (3).

2. The split-stage exhaust dust removal filter according to claim 1, characterized in that: The gas blowback chamber (2) further comprises a pressing plate (27) arranged above the plurality of filter tubes (12), and a partition groove (270) adapted to the partition (25) is provided on the upper surface of the pressing plate (27).

3. The split-stage exhaust dust removal filter according to claim 2 is characterized in that: A circle of first annular clamping grooves (32) are provided on the upper surface of the orifice plate (3) near the edge, and a circle of first protruding clamping rings (33) are provided on the lower surface of the orifice plate (3) near the edge.

4. The split-stage exhaust dust removal filter according to claim 3 is characterized in that: A second annular retaining groove (130) adapted to the first protruding retaining ring (33) is provided on the upper end surface of the second flange (14) near the edge, and a second protruding retaining ring (240) adapted to the first annular retaining groove (32) is provided on the lower surface of the third flange (24).

5. The split-stage exhaust dust removal filter according to claim 4 is characterized in that: A sealing ring (34) is provided in each of the first annular groove (32) and the second annular groove (130).

6. The split-stage exhaust dust removal filter according to claim 1, characterized in that: The side surface of the lower shell (11) is provided with a first pressure gauge interface (110) communicating with its inner cavity, and the side surface of the upper shell (21) is provided with a second pressure gauge interface (210) communicating with its inner cavity. Pressure gauges are provided on both the first pressure gauge interface (110) and the second pressure gauge interface (210).

7. The split-stage exhaust dust removal filter according to claim 1, characterized in that: There are two tail gas outlets (23), which are respectively arranged above the two back-blowing chambers (26).

8. The split-stage exhaust dust removal filter according to claim 1, characterized in that: The gas back-blowing device (22) comprises a back-blowing interface (211) arranged on the upper shell (21), the back-blowing interface (211) is provided with a back-blowing pipe (212) extending into the back-blowing chamber (26), and the back-blowing pipe (212) is provided with a plurality of back-blowing nozzles (213).

9. The split-stage exhaust dust removal filter according to claim 8, characterized in that: The back-blowing nozzle (213) comprises a nozzle (2130), a gasket (2131) and a nozzle (2132), wherein the gasket (2131) is located between the nozzle (2130) and the nozzle (2132), and the nozzle (2130) is threadedly connected to the nozzle (2132).

10. The split-stage exhaust dust removal filter according to claim 9, characterized in that: The gas passage of the nozzle (2130) comprises a first constant diameter section, a conical contraction section, and a second constant diameter section connected in sequence, and the gas passage of the nozzle (2132) comprises a third constant diameter section and a conical expansion section connected in sequence, wherein the diameter of the second constant diameter section is greater than the diameter of the third constant diameter section.

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