Tail gas treatment device for carbon fiber production

Abstract

The application provides a tail gas treatment device for carbon fiber production and relates to the technical field of tail gas treatment. The application has the advantages that the tail gas is first heated in the heating tunnel pipe group, then the tail gas is heated to rise to the heat rising filter box group, and then the fiber filaments of part of particles and residues are filtered, and then the tar, benzene series and hydrogen cyanide substances remaining in the fiber spraying descending pipe are sprayed and filtered, and finally the tail gas is filtered by the activated carbon filter box and discharged by the tail gas exhaust fan.

Description

Technical Field

[0001] This invention relates to the field of exhaust gas treatment technology, specifically to an exhaust gas treatment device for carbon fiber production. Background Technology

[0002] The environmental pollution caused by exhaust gas emissions is a key focus of local government oversight of enterprises. Exhaust gas is generated during carbon fiber production, containing organic compounds such as acrylonitrile and dimethyl sulfoxide. Direct emission of this gas harms the environment and wastes resources. For example, application number CN202011637728.7 describes a method and equipment for treating exhaust gas in carbon fiber precursor production. This invention provides a method and equipment for treating exhaust gas in carbon fiber precursor production, comprising a scrubbing tower, an exhaust gas inlet pipeline at the bottom of the scrubbing tower, an exhaust gas outlet pipeline at the top of the scrubbing tower, a pure absorbent pipeline at the top of the scrubbing tower, a fan on the exhaust gas inlet pipeline, a scrubbing liquid outlet pipeline at the bottom of the scrubbing tower, packing material inside the scrubbing tower, a distributor above the packing material connected to the pure absorbent pipeline, a circulating liquid pipeline at the top of the scrubbing tower, a circulating pump on the scrubbing liquid outlet pipeline connected to the circulating liquid pipeline, and the distributor connected to the circulating liquid pipeline. This invention solves the technical problems of high cost, large investment, complex process, and unsatisfactory treatment effect of existing exhaust gas treatment equipment in carbon fiber production. It can be widely applied to exhaust gas treatment processes in carbon fiber production.

[0003] However, in practical applications of the above solutions, the high-temperature tar in the carbon fiber exhaust gas easily condenses and adheres to the surface as it flows through pipes and filter elements, causing a sharp increase in system resistance. This necessitates frequent shutdowns to clean the filter elements, severely impacting processing efficiency and production continuity. Furthermore, existing equipment lacks sufficient pretreatment for tar particles; direct entry into the scrubbing tower or activated carbon filter unit accelerates clogging and shortens equipment lifespan. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a tail gas treatment device for carbon fiber production, which solves the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a carbon fiber production exhaust gas treatment device, comprising a heated tunnel pipe assembly, a heat rise filter assembly, a fiber spray downcomer, and an activated carbon filter. The heated tunnel pipe assembly heats and insulates the input carbon fiber exhaust gas, keeping the tar in the exhaust gas in a molten, flowing state. The heat rise filter assembly is positioned above the heated tunnel pipe assembly, utilizing the natural upward flow of the heated exhaust gas to enter the filter assembly, where tar particles and fiber residues in the exhaust gas are intercepted by the tar filter layer. The fiber spray downcomer is connected to the outlet of the heat rise filter assembly, spraying and washing the exhaust gas after heat rise filtration to remove residual benzene compounds and hydrogen cyanide. The activated carbon filter is positioned at the outlet of the fiber spray downcomer, adsorbing and filtering the sprayed and washed exhaust gas, ensuring it meets emission standards before discharge.

[0006] This invention provides a waste gas treatment device for carbon fiber production. It has the following beneficial effects:

[0007] (1) In this invention, the exhaust gas enters the heated tunnel pipe group from the exhaust gas delivery pipe. The exhaust gas is first heated and then rises to the heat rise filter box group by itself, filtering down some of the particles and residues of the fiber filaments. Then, it continues to be filtered down into the pipe fittings through fiber spraying, where the residual tar, benzene series and hydrogen cyanide substances are sprayed down. Finally, it is filtered through the activated carbon filter box and discharged by the exhaust fan.

[0008] (2) In this invention, the exhaust gas enters the conveying connection pipe through the tail gas conveying pipe, passes through the rear end, and is heated by the heat-raising heating copper pipe in the heat-insulating heating square tube. Then it is passed into the heat-raising filter box group through the heat-raising connecting pipe at the top. Through heating, the tar is prevented from being condensed.

[0009] (3) In this invention, the heat rises through the connecting pipe above the heat rises through the connecting pipe, and the heat rises through the connecting pipe is sealed and connected by the connecting piece above the inner filter box mounting base plate. The tar filter layer on the side of the outer support pipe filters the impurities in the exhaust gas. Since the exhaust gas is continuously heated, it can pass through the filter and the tar will not remain. After passing through the double filter screen, it enters the cooling connection platform and is discharged from the cooling connection pipe hole.

[0010] (4) In this invention, the exhaust gas discharged from the cooling connection pipe hole is passed through the cooling pipe fitting, and then the main water pipe and branch round pipe are connected to spray the exhaust gas with N-methylpyrrolidone, sodium hydroxide, copper sulfate, polyethylene glycol, benzotriazole and deionized water. The tar is condensed on the cooling side frame and the cooling through frame, while other substances are efficiently removed by the catalytic oxidation of the spray water. The spray water is then discharged to the cooling connection table. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0012] Figure 2 This is a structural schematic diagram from another perspective of the present invention;

[0013] Figure 3 This is a schematic diagram of the structure of the heated tunnel pipe assembly in this invention;

[0014] Figure 4 This is a front view schematic diagram of the heating tunnel tube assembly in this invention;

[0015] Figure 5 For the present invention Figure 4 Schematic diagram of the cross-sectional structure of line aa in the middle;

[0016] Figure 6 This is a schematic diagram of the structure of the heat-raising filter box assembly in this invention;

[0017] Figure 7 This is a schematic diagram of the heat-rising filter box assembly from another perspective in this invention;

[0018] Figure 8 This is a schematic diagram of the structure of the heat-raising filter box in this invention;

[0019] Figure 9 This is a side view of the heat-raising filter box in this invention.

[0020] Figure 10 For the present invention Figure 9 Schematic diagram of the cross-sectional structure of the middle BB line;

[0021] Figure 11 This is a schematic diagram of the fiber spray downcomer in this invention;

[0022] Figure 12 This is a schematic diagram of the fiber spray downpipe fitting from another perspective in this invention.

[0023] The components include: 1. Processing unit workbench; 2. Heated tunnel pipe assembly; 201. Pipe assembly shell; 202. Pipe assembly connector; 203. Heat-up connecting pipe; 204. Pipe assembly side sealing plate; 205. Conveying connecting pipe; 206. Insulated heating square pipe; 207. Heat-up heating copper pipe; 3. Exhaust gas conveying pipe; 4. Heat-up filter box assembly; 401. Filter box shell; 402. Inner filter box mounting base plate; 403. Heat-up filter box; 4031. Inner filter box shell; 4032. Heat-up through connecting pipe; 4033. Sealing connecting strip; 4034. Double-layer filter screen; 4035. Side pull sealing plate; 4036. Connecting outer plate; 4037. Filter layer observation window. 4038. Maintenance handle; 4039. Tar filter layer; 40310. Outer support pipe; 404. Cooling connection platform; 405. Cooling connection pipe hole; 406. Heat dissipation box slot; 5. Fiber spray downcomer fittings; 501. Cooling fittings; 502. Cooling water nozzle; 503. Branch round pipe; 504. Connecting main water pipe; 505. Cooling side frame; 506. Cooling through frame; 6. Activated carbon box frame; 7. Activated carbon filter box; 8. Supply and exhaust fan back panel; 9. Back panel fixing buckle; 10. Supply and exhaust fan duct; 11. Fan mounting bracket; 12. Exhaust gas supply and exhaust fan; 13. Filter box bottom plate; 14. Workstation railing; 15. Workstation entrance. Detailed Implementation

[0024] 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.

[0025] like Figures 1 to 2As shown, this embodiment of the invention provides a tail gas treatment device for carbon fiber production, including a treatment device workbench 1. A filter box bottom plate 13 is integrally formed on the side of the workbench 1. A heated tunnel pipe assembly 2 is fixedly installed at the lower end of the filter box bottom plate 13, and a heat-rising filter box assembly 4 is fixedly installed at the upper end of the filter box bottom plate 13. A plurality of fiber spray downcomer pipe fittings 5 ​​are connected to the front end of the heat-rising filter box assembly 4. An activated carbon filter box 7 is provided at the front end of the fiber spray downcomer pipe fittings 5, and an activated carbon box frame 6 is provided on the activated carbon filter box 7. The activated carbon filter box 7 is provided with several exhaust fan backplates 8 at its outer end. Several backplate fixing buckles 9 are provided on the side of the exhaust fan backplates 8. An exhaust fan duct 10 is provided at the front end of the exhaust fan backplates 8. A fan mounting bracket 11 is provided inside the exhaust fan duct 10. An exhaust gas exhaust fan 12 is installed inside the fan mounting bracket 11. One end of the heating tunnel pipe group 2 is connected to an exhaust gas delivery pipe 3. A workbench railing 14 is provided at the edge of the processing device workbench 1. A workbench entrance 15 is provided on the side of the processing device workbench 1.

[0026] In the above technical solution, the exhaust gas enters the heated tunnel pipe group 2 from the exhaust gas delivery pipe 3. The exhaust gas is first heated and then rises to the heat rise filter box group 4 to filter out some particles and residual fiber filaments. Then it continues to pass through the fiber spray downpipe 5 to filter out the residual tar, benzene series and hydrogen cyanide substances. Finally, it passes through the activated carbon filter box 7 and is discharged by the exhaust gas fan 12.

[0027] like Figure 1 , Figures 3 to 5 As shown, the heated tunnel pipe assembly 2 includes: a pipe assembly shell 201, pipe assembly connectors 202, a heat-rising connecting pipe 203, a pipe assembly side sealing plate 204, a conveying connecting pipe 205, a heat-insulating heating square pipe 206, and a heat-rising heating copper pipe 207; the pipe assembly shell 201 is provided with several pipe assembly connectors 202 in the middle, the pipe assembly shell 201 is provided with a pipe assembly side sealing plate 204 on the side, and the side of the pipe assembly side sealing plate 204 is connected to the conveying connecting pipe 205; the side of the pipe assembly side sealing plate 204 is provided with a heat-insulating heating square pipe 206, the heat-insulating heating square pipe 206 is provided with several heat-rising heating copper pipes 207 inside, the upper end of the heat-insulating heating square pipe 206 is connected to several heat-rising connecting pipes 203, and the conveying connecting pipe 205 is connected to the exhaust gas conveying pipe 3.

[0028] In the above technical solution, the exhaust gas enters the conveying connection pipe 205 through the exhaust gas conveying pipe 3, passes through the rear end, and is heated by the heat-raising heating copper pipe 207 in the heat-insulating heating square pipe 206. Then it is passed into the heat-raising filter box group 4 from the upper heat-raising connecting pipe 203. Through heating, the tar is prevented from being condensed.

[0029] like Figure 1 , Figures 6 to 7 As shown, the heat-raising filter box assembly 4 includes: a filter box shell 401, an inner filter box mounting base plate 402, a heat-raising filter box 403, a cooling connection platform 404, a cooling connection pipe hole 405, and a heat dissipation box slot 406; the filter box shell 401 is provided with a plurality of inner filter box mounting base plates 402, the heat-raising filter box 403 is provided on the inner filter box mounting base plate 402, the cooling connection platform 404 is integrally provided on the side of the filter box shell 401, the front end of the cooling connection platform 404 is provided with a cooling connection pipe hole 405, and the other side of the filter box shell 401 is provided with a heat dissipation box slot 406.

[0030] like Figure 6 , Figures 8 to 10 As shown, the heat-raising filter box 403 includes: an inner filter box shell 4031, a heat-raising through-connecting pipe 4032, a sealing connecting strip 4033, a double-layer filter screen 4034, a side pull-sealing plate 4035, a connecting outer plate 4036, a filter layer observation window 4037, a maintenance handle 4038, a tar filter layer 4039, and an outer support pipe 40310; the inner filter box shell 4031 is provided with a double-layer filter screen 4034 on its side, and a sealing connecting strip 4033 is provided on the side of the double-layer filter screen 4034; the upper and lower ends of the inner filter box shell 4031 are both integrally provided with heat-raising through-connecting pipes. Connector 4032, an outer support tube 40310 is slidably disposed inside the outer shell 4031 of the inner filter box, a tar filter layer 4039 is disposed on the side of the outer support tube 40310; a side pull sealing plate 4035 is disposed on the side of the outer support tube 40310, a connecting outer plate 4036 is disposed at the outer end of the side pull sealing plate 4035, a filter layer observation window 4037 is opened at the outer end of the connecting outer plate 4036, a maintenance handle 4038 is disposed on the side of the connecting outer plate 4036, and the heat rise through connecting tube 4032 is connected to the connecting port disposed on the upper inner filter box mounting base plate 402.

[0031] In the above technical solution, the heat rise connecting pipe 203 is connected to the upper heat rise through connecting pipe 4032, and the heat rise through connecting pipe 4032 is sealed and connected by the connector on the inner filter box mounting base plate 402. The tar filter layer 4039 on the side of the outer support pipe 40310 filters the impurities in the exhaust gas. Since the exhaust gas is continuously heated, it can pass through the filter and no tar will remain. After passing through the double filter screen 4034, it enters the cooling connecting platform 404 and is discharged from the cooling connecting pipe hole 405.

[0032] like Figure 1 , Figures 11 to 12As shown, the fiber spray downcomer 5 includes: a downcomer 501, a downcomer nozzle 502, a branch pipe 503, a main water pipe 504, a downcomer side frame 505, and a downcomer through frame 506; the downcomer 501 is connected to the downcomer connecting pipe hole 405, a plurality of downcomer nozzles 502 are provided inside the downcomer 501, a plurality of branch pipes 503 are connected to the outer end of the downcomer nozzles 502, and a plurality of main water pipes 504 are connected to the branch pipes 503; two downcomer side frames 505 are connected to the inner wall of the downcomer 501, a plurality of downcomer through frames 506 are provided between the downcomer side frames 505, and the main water pipe 504 is connected to the pump at its outer end.

[0033] In the above technical solution, the exhaust gas discharged from the cooling connection pipe hole 405 is passed through the cooling pipe fitting 501, and then the exhaust gas is sprayed with a mixture of N-methylpyrrolidone, sodium hydroxide, copper sulfate, polyethylene glycol, benzotriazole and deionized water through the main water pipe 504 and the branch round pipe 503. The tar is condensed on the cooling side frame 505 and the cooling through frame 506, while other substances are efficiently removed by the catalytic oxidation of the spray water. The spray water flows to the cooling connection table 404 and is discharged.

[0034] Working principle:

[0035] This invention involves heating the exhaust gas from the exhaust gas delivery pipe 3 into the heated tunnel pipe assembly 2. The heated exhaust gas rises to the heat-lifting filter box assembly 4, where some particles and residual fiber filaments are filtered down. Then, it continues to pass through the fiber spraying and descending pipe 5, where residual tar, benzene compounds, and hydrogen cyanide are sprayed down. Finally, it passes through the activated carbon filter box 7 and is discharged by the exhaust gas exhaust fan 12.

[0036] Among them, the exhaust gas enters the conveying connection pipe 205 through the exhaust gas conveying pipe 3, passes through the rear end, and is heated by the heat-raising heating copper pipe 207 in the heat-insulating heating square pipe 206. Then it is passed into the heat-raising filter box group 4 from the heat-raising connecting pipe 203 at the upper end. Through heating, the tar is prevented from being condensed.

[0037] The gas flows through the upper heat-increasing through-connecting pipe 4032 via the heat-increasing connecting pipe 203. The heat-increasing through-connecting pipe 4032 is sealed and connected by the connector on the inner filter box mounting base plate 402. The gas filters impurities in the exhaust gas through the tar filter layer 4039 on the side of the outer support pipe 40310. Since the exhaust gas is continuously heated, it can pass through the filter and no tar will remain. After passing through the double-layer filter screen 4034, the gas enters the cooling connection platform 404 and is discharged from the cooling connection pipe hole 405.

[0038] Specifically, the exhaust gas discharged from the cooling connection pipe hole 405 is passed through the cooling pipe fitting 501, and then sprayed with a mixture of N-methylpyrrolidone, sodium hydroxide, copper sulfate, polyethylene glycol, benzotriazole and deionized water through the main water pipe 504 and the branch round pipe 503. The tar is condensed on the cooling side frame 505 and the cooling through frame 506, while other substances are efficiently removed by the catalytic oxidation of the sprayed water. The sprayed water flows to the cooling connection table 404 and is discharged.

[0039] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. All obvious variations or modifications derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. A tail gas treatment device for carbon fiber production, characterized in that, include: Heated tunnel pipe assembly (2) is used to heat the input exhaust gas; The heat rise filter box group (4) is set above the heating tunnel pipe group (2) and uses the rising airflow of the heated exhaust gas to filter the exhaust gas. The fiber spray downpipe (5) is connected to the outlet end of the heat rise filter box group (4) and is used to spray and wash the exhaust gas after heat rise filtration. An activated carbon filter box (7) is installed at the outlet end of the fiber spray downpipe (5) and is used to adsorb and filter the exhaust gas after spray washing.

2. The exhaust gas treatment device for carbon fiber production according to claim 1, characterized in that, The heating tunnel tube assembly (2) includes a tube assembly shell (201) and an insulated heating square tube (206) disposed inside the tube assembly shell (201). The insulated heating square tube (206) is provided with a plurality of heat-raising heating copper tubes (207). The upper end of the insulated heating square tube (206) is connected to a plurality of heat-raising connecting pipes (203). The heat-raising connecting pipes (203) are connected to the heat-raising filter box assembly (4).

3. The exhaust gas treatment device for carbon fiber production according to claim 1, characterized in that, The heat-rise filter assembly (4) includes a filter housing (401) and at least one heat-rise filter (403) disposed within the filter housing (401), the heat-rise filter (403) comprising: The inner filter box outer shell (4031) is equipped with heat rise through connecting pipes (4032) at both its upper and lower ends. The tar filter layer (4039) is removably disposed inside the outer shell (4031) of the inner filter box; A double-layer filter screen (4034) is disposed on the side of the inner filter box housing (4031).

4. The exhaust gas treatment device for carbon fiber production according to claim 3, characterized in that, The tar filter layer (4039) is fixed to the side of the outer support tube (40310), and the outer support tube (40310) is slidably disposed inside the inner filter box shell (4031); a side pull sealing plate (4035) is provided at the end of the outer support tube (40310), and a connecting outer plate (4036) is provided at the outer end of the side pull sealing plate (4035), and a maintenance handle (4038) is provided on the connecting outer plate (4036).

5. The exhaust gas treatment device for carbon fiber production according to claim 4, characterized in that, A filter layer observation window (4037) is provided on the connecting outer plate (4036).

6. The exhaust gas treatment device for carbon fiber production according to claim 1, characterized in that, The fiber spray downpipe (5) includes a downpipe (501) and a plurality of downpipe nozzles (502) disposed in the downpipe (501). The downpipe nozzles (502) are connected to the main water pipe (504) through branch pipes (503).

7. The exhaust gas treatment device for carbon fiber production according to claim 6, characterized in that, The inner wall of the cooling pipe fitting (501) is provided with two cooling side frames (505), and a number of cooling through frames (506) are provided between the two cooling side frames (505).

8. The exhaust gas treatment device for carbon fiber production according to claim 1, characterized in that, The activated carbon filter box (7) is equipped with an exhaust fan (12) at the outlet end.

9. The exhaust gas treatment device for carbon fiber production according to claim 1, characterized in that, The heating tunnel tube assembly (2) is located below the filter box bottom plate (13), the heat-raising filter box assembly (4) is located above the filter box bottom plate (13), and the filter box bottom plate (13) is fixed to the side of the processing device workbench (1).

10. The exhaust gas treatment device for carbon fiber production according to claim 1, characterized in that, The air inlet of the heated tunnel tube assembly (2) is connected to the exhaust gas delivery pipe (3).

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