Carbon fiber production waste gas comprehensive treatment and utilization device

Abstract

The application provides a carbon fiber production waste gas comprehensive treatment and utilization device and relates to the technical field of waste gas treatment. The carbon fiber production waste gas comprehensive treatment and utilization device is based on a workbench and a treatment chamber. The upper portion of the workbench is fixedly connected with the treatment chamber. The middle portion of one end of the treatment chamber is fixedly connected with a connecting sleeve. The end, away from the treatment chamber, of the connecting sleeve is fixedly connected with a diffusion pipe. The end, away from the connecting sleeve, of the diffusion pipe is fixedly connected with a self-suction pump. The self-suction pump is arranged to, when started, form a negative pressure in the heat insulation sleeve by using a Laval nozzle and a negative pressure sleeve pipe through high-pressure gas to extract high-temperature waste gas. When the heating pipe and the spiral plate reach a sufficient temperature, the self-suction pump can be switched to a water supply pipe to make water enter the heating pipe. The high-temperature waste gas is used to heat the water in the heating pipe to high-pressure steam which is sprayed from the Laval nozzle. The negative pressure formed drives flue gas to be discharged, thereby forming a self-suction effect.

Description

Technical Field

[0001] This invention relates to the field of waste gas treatment technology, specifically to a comprehensive treatment and utilization device for waste gas from carbon fiber production. Background Technology

[0002] In the 21st century, carbon fiber, with its superior properties as a fiber-reinforced composite material, has been widely used in aerospace, defense, sports equipment, medical equipment, new energy, and civil engineering, leading to a rapid increase in demand for high-performance carbon fiber. The carbon fiber manufacturing process includes pre-oxidation, carbonization, and surface treatment, each step having a crucial impact on the quality of the carbon fiber.

[0003] The patent application with application number CN100451190C provides a high-efficiency and energy-saving device for the recycling of heated gas. It uses a gas purifier to purify the high-heat waste gas discharged from the carbon fiber production equipment before it is recycled back into the carbon fiber production equipment, which reduces production energy consumption to a certain extent. However, the device requires the hot and cold gases to flow in opposite directions, so an electric pump is needed to pump the waste gas before heat exchange can take place. However, ordinary electric pumps consume a lot of energy and are prone to failure when used in high-temperature environments, requiring frequent maintenance. Therefore, there is room for further improvement. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a comprehensive treatment and utilization device for carbon fiber production waste gas. This solves the problem that existing devices require the opposing flow of hot and cold gases, necessitating the use of electric pumps to pump the waste gas before heat exchange can occur. However, conventional electric pumps consume a lot of energy and are prone to malfunctions in high-temperature environments, requiring frequent maintenance.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a comprehensive treatment and utilization device for carbon fiber production waste gas, comprising a workbench and a treatment chamber. The treatment chamber is fixedly connected above the workbench. A connecting sleeve is fixedly connected to the middle of one end of the treatment chamber. A diffuser pipe is fixedly connected to the end of the connecting sleeve away from the treatment chamber. A self-priming pump is fixedly connected to the end of the diffuser away from the connecting sleeve. A three-way control valve is fixedly connected to the end of the self-priming pump away from the diffuser pipe. A high-temperature waste gas connecting pipe is fixedly connected to the lower end of the self-priming pump near the three-way control valve. A water supply pipe is fixedly connected to the end of the three-way control valve away from the self-priming pump. A water supply control valve is provided at the end of the water supply pipe near the self-priming pump. A high-pressure gas pipe is fixedly connected above the three-way control valve. An air inlet control valve is provided at the end of the high-pressure gas pipe away from the three-way control valve.

[0006] The self-priming pump includes a heat insulation sleeve, a heating tube, a suction chamber, a spiral plate, a Laval nozzle, and a negative pressure sleeve. The heating tube is located at the center of the heat insulation sleeve, and three spiral plates are evenly fixedly connected to the outer side of the heating tube. The suction chamber is located at the end of the heat insulation sleeve near the three-way control valve. The negative pressure sleeve is fixedly connected to the center of the end of the heat insulation sleeve away from the three-way control valve. The Laval nozzle is fixedly connected to the end of the heating tube away from the three-way control valve, and the jet port of the Laval nozzle is fitted into the center of the negative pressure sleeve.

[0007] A primary heat exchanger is fixedly connected to the top of the processing chamber near the connecting sleeve. A secondary heat exchanger is fixedly connected to the top of the processing chamber near the primary heat exchanger. An inlet pipe and an outlet pipe are fixedly connected to the top two sides of both the primary and secondary heat exchangers. Multiple heat exchange tubes are fixedly connected to the bottom of both the primary and secondary heat exchangers. A base is fixedly connected to the bottom of the workbench. A communicating vessel is provided on the top of the base at a position corresponding to the primary and secondary heat exchangers.

[0008] A partition is fixedly connected to the middle of the treatment chamber. An exhaust gas pipe is fixedly connected to the middle of the end of the treatment chamber away from the connecting sleeve. A spray seat is provided at the upper end of the treatment chamber near the exhaust gas pipe. A mixer is fixedly connected to the middle of the upper part of the spray seat. A water inlet pipe is fixedly connected to the middle of the upper part of the mixer. Neutralizing agent pipes are fixedly connected to both ends of the upper part of the mixer. Multiple spray heads are arranged in an array at the bottom of the spray seat. A wastewater pool is opened at the position corresponding to the spray seat above the base. A wastewater pipe is provided at the lower end of the base near the exhaust gas pipe.

[0009] Preferably, the inner wall of the processing chamber is provided with a heat insulation layer, and the inner wall of the heat insulation layer is provided with a metal reflective layer.

[0010] Preferably, a connecting groove is provided at the position corresponding to the wastewater pool on the workbench, and a filter screen is provided inside the connecting groove.

[0011] Preferably, the inlet pipes of the primary heat exchanger and the secondary heat exchanger are connected to the corresponding outlet pipes through corresponding heat exchange pipes and communicating vessels.

[0012] Preferably, the outer sides of all three spiral plates are fixedly connected to the heat insulation sleeve.

[0013] Preferably, the end of the heating tube furthest from the negative pressure sleeve is fixedly connected to the three-way control valve.

[0014] Preferably, the lowest end of the wastewater pool is fixedly connected to the wastewater pipe.

[0015] Working Principle: In operation, this invention utilizes an internal heating pipe, spiral plate, Laval nozzle, and negative pressure sleeve, along with a high-pressure gas pipe, water supply pipe, and three-way control valve. Upon startup, high-pressure gas creates a negative pressure inside the insulation sleeve via the Laval nozzle and negative pressure sleeve, drawing in high-temperature exhaust gas. When the heating pipe and spiral plate reach sufficient temperature, the system switches to the water supply pipe, allowing water to enter the heating pipe. The high-temperature exhaust gas heats the water in the heating pipe to high-pressure steam, which is then ejected from the Laval nozzle. The resulting negative pressure drives the exhaust gas out. The system achieves a self-priming effect. Then, the high-temperature exhaust gas enters the treatment chamber through the diffuser. Using a two-stage heat exchanger, along with heat exchange tubes and a connecting device, the purified gas can fully utilize the heat of the high-temperature exhaust gas through two-stage heat exchange. After reheating, it can be reused in carbon fiber production, improving resource utilization efficiency. Finally, through the spray seat, along with the mixer and neutralizing agent pipeline, a spray liquid containing neutralizing agent can be sprayed to purify the exhaust gas. By reducing the temperature of the exhaust gas, the water vapor content is reduced, facilitating subsequent dehydration and reuse of the exhaust gas.

[0016] This invention provides a comprehensive treatment and utilization device for waste gas from carbon fiber production. It has the following beneficial effects:

[0017] 1. The self-priming pump of this invention, through its internal heating tube, spiral plate, Laval nozzle, and negative pressure sleeve, along with a high-pressure gas pipe, water supply pipe, and three-way control valve, can draw in high-temperature exhaust gas during startup by using high-pressure gas and creating a negative pressure inside the insulation sleeve through the Laval nozzle and negative pressure sleeve. When the heating tube and spiral plate reach a sufficient temperature, the pump can switch to the water supply pipe to allow water to enter the heating tube. The high-temperature exhaust gas then heats the water in the heating tube to high-pressure steam, which is then ejected from the Laval nozzle. The resulting negative pressure drives the exhaust gas out, thus achieving a self-priming effect.

[0018] 2. This invention is equipped with a two-stage heat exchanger, which, together with heat exchange tubes and a communicating vessel, can fully utilize the heat of the high-temperature waste gas through the two-stage heat exchange, and then reheat it before it is put into carbon fiber production for reuse, thereby improving resource utilization efficiency.

[0019] 3. The present invention is equipped with a spray seat, which, together with a mixer and a neutralizing agent pipeline, can spray a spray liquid containing a neutralizing agent to purify the waste gas. It also reduces the water vapor content by lowering the temperature of the waste gas, making it easier for the waste gas to be dehydrated and reused in the future. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the left-side three-dimensional structure of the present invention;

[0021] Figure 2 This is a three-dimensional structural diagram of the right side of the present invention;

[0022] Figure 3This is a front view of the present invention;

[0023] Figure 4 This is a schematic diagram of the internal structure of the processing room of the present invention;

[0024] Figure 5 This is a schematic diagram of the internal three-dimensional structure of the self-priming pump of the present invention;

[0025] The components are as follows: 1. Workbench; 2. Processing chamber; 3. Base; 4. Connecting sleeve; 5. Diffuser tube; 6. Self-priming pump; 601. Heat insulation sleeve; 602. Heating tube; 603. Suction chamber; 604. Spiral plate; 605. Laval nozzle; 606. Negative pressure sleeve; 7. Three-way control valve; 8. Water supply pipe; 9. High-temperature exhaust gas connection pipe; 10. Water supply control valve; 11. High-pressure gas pipe; 12. Inlet control valve; 13. Primary heat exchanger; 14. Secondary heat exchanger; 15. Spray seat; 16. Exhaust gas pipe; 17. Wastewater pipe; 18. Wastewater pool; 19. Inlet pipe; 20. Outlet pipe; 21. Heat exchange tube; 22. Communicating device; 23. Mixer; 24. Water inlet pipe; 25. Neutralizing agent pipeline; 26. Spray head; 27. Partition plate; 28. Filter screen. Detailed Implementation

[0026] 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.

[0027] Example:

[0028] like Figure 1-5 As shown, this embodiment of the invention provides a comprehensive treatment and utilization device for carbon fiber production waste gas, including a workbench 1 and a treatment chamber 2. The treatment chamber 2 is fixedly connected above the workbench 1. The inner wall of the treatment chamber 2 is provided with a heat insulation layer, and the inner wall of the heat insulation layer is provided with a metal reflective layer. A connecting sleeve 4 is fixedly connected to the middle of one end of the treatment chamber 2. A diffuser pipe 5 is fixedly connected to the end of the connecting sleeve 4 away from the treatment chamber 2. A self-priming pump 6 is fixedly connected to the end of the diffuser pipe 5 away from the connecting sleeve 4. A three-way control valve 7 is fixedly connected to the end of the self-priming pump 6 away from the diffuser pipe 5. A high-temperature waste gas connecting pipe 9 is fixedly connected to the lower end of the self-priming pump 6 near the three-way control valve 7. A water supply pipe 8 is fixedly connected to the end of the three-way control valve 7 away from the self-priming pump 6. A water supply control valve 10 is provided at the end of the water supply pipe 8 near the self-priming pump 6. A high-pressure gas pipe 11 is fixedly connected above the three-way control valve 7. An air inlet control valve 12 is provided at the end of the high-pressure gas pipe 11 away from the three-way control valve 7.

[0029] The self-priming pump 6 includes a heat insulation sleeve 601, a heating pipe 602, a suction chamber 603, a spiral plate 604, a Laval nozzle 605, and a negative pressure sleeve 606. The heating pipe 602 is located at the center of the heat insulation sleeve 601. Three spiral plates 604 are evenly and fixedly connected to the outer side of the heating pipe 602, and the outer sides of each spiral plate 604 are fixedly connected to the heat insulation sleeve 601. The suction chamber 603 is located inside the heat insulation sleeve 601 near the three-way control valve 7. The negative pressure sleeve 606 is fixedly connected at the center of the end of the heat insulation sleeve 601 away from the three-way control valve 7. The Laval nozzle 605 is fixedly connected at the end of the heating pipe 602 away from the three-way control valve 7. The jet port of the Laval nozzle 605 is inserted into the center of the negative pressure sleeve 606. The heating pipe 602... 2. The end away from the negative pressure sleeve 606 is fixedly connected to the three-way control valve 7. The self-priming pump 6 of this invention, through the internal heating pipe 602, spiral plate 604, Laval nozzle 605 and negative pressure sleeve 606, in conjunction with the high-pressure air pipe 11, water supply pipe 8 and three-way control valve 7, can form a negative pressure inside the heat insulation sleeve 601 by using high-pressure gas through the Laval nozzle 605 and negative pressure sleeve 606 to extract high-temperature waste gas when starting. When the heating pipe 602 and spiral plate 604 reach a sufficient temperature, the water supply pipe 8 can be switched to allow water to enter the heating pipe 602. The high-temperature waste gas is used to heat the water in the heating pipe 602 to high-pressure steam, which is sprayed out from the Laval nozzle 605. The negative pressure formed drives the high-temperature waste gas to be discharged, forming a self-priming effect.

[0030] A primary heat exchanger 13 is fixedly connected to the top of the processing chamber 2 near the end of the connecting sleeve 4. A secondary heat exchanger 14 is fixedly connected to the top of the processing chamber 2 near the end of the primary heat exchanger 13. An inlet pipe 19 and an outlet pipe 20 are fixedly connected to the upper sides of both the primary heat exchanger 13 and the secondary heat exchanger 14, respectively. Multiple heat exchange tubes 21 are fixedly connected to the lower sides of both the primary heat exchanger 13 and the secondary heat exchanger 14. A base 3 is fixedly connected to the lower side of the workbench 1. A communicating vessel 22 is provided at the upper side of the base 3 at the position corresponding to the primary heat exchanger 13 and the secondary heat exchanger 14. The inlet pipes 19 of the primary heat exchanger 13 and the secondary heat exchanger 14 are connected to the corresponding outlet pipes 20 through the corresponding heat exchange tubes 21 and communicating vessels 22. The two-stage heat exchangers set in this invention, in conjunction with the corresponding heat exchange tubes 21 and communicating vessels 22, can make full use of the heat of the high-temperature waste gas through two-stage heat exchange, and after reheating, it can be put into carbon fiber production for reuse, thereby improving resource utilization efficiency.

[0031] A partition 27 is fixedly connected to the middle of the treatment chamber 2. An exhaust gas pipe 16 is fixedly connected to the middle of the end of the treatment chamber 2 away from the connecting sleeve 4. A spray seat 15 is provided at the upper end of the treatment chamber 2 near the exhaust gas pipe 16. A mixer 23 is fixedly connected to the middle of the upper part of the spray seat 15. A water inlet pipe 24 is fixedly connected to the middle of the upper part of the mixer 23. Neutralizing agent pipes 25 are fixedly connected to both ends of the upper part of the mixer 23. Multiple spray heads 26 are arranged in an array at the bottom of the spray seat 15. The upper part of the base 3 is positioned corresponding to the spray seat 15. A wastewater tank 18 is provided at the workbench 1, and a connecting groove is provided at the position corresponding to the wastewater tank 18. A filter screen 28 is provided inside the connecting groove. A wastewater pipe 17 is provided at the end of the base 3 near the exhaust gas pipe 16. The lowest end of the wastewater tank 18 is fixedly connected to the wastewater pipe 17. The spray seat 15 provided in this invention, together with the mixer 23 and the neutralizing agent pipe 25, can spray spray liquid containing neutralizing agent to purify the exhaust gas. It also reduces the water vapor content by lowering the temperature of the exhaust gas, which is convenient for subsequent dehydration and reuse of the exhaust gas.

[0032] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for comprehensive treatment and utilization of waste gas from carbon fiber production, comprising a workbench (1) and a treatment chamber (2), characterized in that: A processing chamber (2) is fixedly connected above the workbench (1). A connecting sleeve (4) is fixedly connected to the middle of one end of the processing chamber (2). A diffuser pipe (5) is fixedly connected to the end of the connecting sleeve (4) away from the processing chamber (2). A self-priming pump (6) is fixedly connected to the end of the diffuser pipe (5) away from the connecting sleeve (4). A three-way control valve (7) is fixedly connected to the end of the self-priming pump (6) away from the diffuser pipe (5). A high-temperature exhaust gas connecting pipe (9) is fixedly connected to the lower end of the self-priming pump (6) near the three-way control valve (7). A water supply pipe (8) is fixedly connected to the end of the three-way control valve (7) away from the self-priming pump (6). A water supply control valve (10) is provided at the end of the water supply pipe (8) near the self-priming pump (6). A high-pressure gas pipe (11) is fixedly connected above the three-way control valve (7). An air intake control valve (12) is provided at the end of the high-pressure gas pipe (11) away from the three-way control valve (7). The self-priming pump (6) includes a heat insulation sleeve (601), a heating tube (602), a suction chamber (603), a spiral plate (604), a Laval nozzle (605), and a negative pressure sleeve (606). The heating tube (602) is located at the center of the heat insulation sleeve (601). Three spiral plates (604) are evenly fixedly connected to the outside of the heating tube (602). The suction chamber (603) is located at the end of the heat insulation sleeve (601) near the three-way control valve (7). The negative pressure sleeve (606) is fixedly connected at the center of the end of the heat insulation sleeve (601) away from the three-way control valve (7). The Laval nozzle (605) is fixedly connected at the end of the heating tube (602) away from the three-way control valve (7). The jet port of the Laval nozzle (605) is inserted into the center of the negative pressure sleeve (606). The end of the heating tube (602) away from the negative pressure sleeve (606) is fixedly connected to the three-way control valve (7). A primary heat exchanger (13) is fixedly connected to the top of the processing chamber (2) near the end of the connecting sleeve (4). A secondary heat exchanger (14) is fixedly connected to the top of the processing chamber (2) near the end of the primary heat exchanger (13). An air inlet pipe (19) and an air outlet pipe (20) are fixedly connected to the upper sides of both the primary heat exchanger (13) and the secondary heat exchanger (14). Multiple heat exchange tubes (21) are fixedly connected to the lower sides of both the primary heat exchanger (13) and the secondary heat exchanger (14). A base (3) is fixedly connected to the lower side of the workbench (1). A communicating vessel (22) is provided on the upper side of the base (3) at a position corresponding to the primary heat exchanger (13) and the secondary heat exchanger (14). A partition (27) is fixedly connected to the middle of the treatment chamber (2). A waste gas pipe (16) is fixedly connected to the middle of the end of the treatment chamber (2) away from the connecting sleeve (4). A spray seat (15) is provided at the upper end of the treatment chamber (2) near the waste gas pipe (16). A mixer (23) is fixedly connected to the middle of the upper part of the spray seat (15). A water inlet pipe (24) is fixedly connected to the middle of the upper part of the mixer (23). Neutralizing agent pipes (25) are fixedly connected to both ends of the mixer (23). Multiple spray heads (26) are arranged in an array at the bottom of the spray seat (15). A wastewater pool (18) is opened at the position corresponding to the spray seat (15) above the base (3). A wastewater pipe (17) is provided at the lower end of the base (3) near the waste gas pipe (16).

2. The carbon fiber production waste gas comprehensive treatment and utilization device according to claim 1, characterized in that: The inner wall of the processing chamber (2) is provided with a heat insulation layer, and the inner wall of the heat insulation layer is provided with a metal reflective layer.

3. The carbon fiber production waste gas comprehensive treatment and utilization device according to claim 1, characterized in that: A connecting groove is provided at the position corresponding to the workbench (1) and the wastewater pool (18), and a filter screen (28) is provided inside the connecting groove.

4. The carbon fiber production waste gas comprehensive treatment and utilization device according to claim 1, characterized in that: The inlet pipes (19) of the primary heat exchanger (13) and the secondary heat exchanger (14) are connected to the corresponding outlet pipes (20) through the corresponding heat exchange pipes (21) and the communicating vessel (22).

5. The carbon fiber production waste gas comprehensive treatment and utilization device according to claim 1, characterized in that: The outer sides of the three spiral plates (604) are fixedly connected to the heat insulation sleeve (601).

6. The carbon fiber production waste gas comprehensive treatment and utilization device according to claim 1, characterized in that: The lowest end of the wastewater pool (18) is fixedly connected to the wastewater pipe (17).

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