High-temperature carbonization grate exhaust system and control method thereof

Abstract

The application discloses a high-temperature carbonization exhaust system and a control method thereof. The exhaust system comprises a high-temperature carbonization furnace, a filter screen installed in an exhaust pipeline for filtering hair in the exhaust pipeline, a first automatic valve and a second automatic valve both installed on the exhaust pipeline and located on both sides of the filter screen, a first nitrogen valve installed on the exhaust pipeline between the filter screen and the second automatic valve for monitoring the pressure value of the high-temperature carbonization furnace head in real time, and a control module electrically connected with the first automatic valve, the second automatic valve, the first nitrogen valve and a pressure transmitter and used for adjusting the valve opening degree of the first automatic valve and the second automatic valve. The application can effectively intercept the hair at the exhaust outlet on both sides of the high-temperature carbonization furnace and prevent the hair from being sucked into the upper pipeline by negative pressure.

Description

Technical Field

[0001] This invention relates to the field of carbon fiber production equipment, and in particular to a technology for filtering exhaust gas from high-temperature carbonization furnace ducts during carbon fiber production. Specifically, it relates to a high-temperature carbonization furnace exhaust gas system and its control method. Background Technology

[0002] High-temperature carbonization is a key process in carbon fiber production. Within the temperature range of 1000–1600℃, the carbon content in the fiber increases almost linearly with increasing carbonization temperature, as non-carbon elements are continuously removed and carbon accumulates. During high-temperature carbonization, the fiber releases many small-molecule byproducts while transforming into a disordered graphite structure. The transformation of the PAN-based fiber structure largely determines the structure of the carbon fiber, affecting its mechanical, thermal, chemical, and electrical properties.

[0003] The exhaust gas emissions from the high-temperature carbonization furnace directly affect the final quality of the carbon fiber product. Because the high-temperature carbonization furnace is the high-temperature zone in the carbonization process, the exhaust gas generated in this zone contains HCN, a byproduct released during the cross-linking and polycondensation processes, which consists of small trapezoidal structures. Nitrogen release occurs after 900℃, indicating the stability of nitrogen in the structure. Generally, at a carbonization temperature of 1300℃, the carbon content reaches over 92%, with a residual nitrogen content of about 5%. As the carbonization temperature gradually increases, the nitrogen content decreases to 1%–2%. The byproducts of high-temperature carbonization, including hydrogen cyanide, ammonia, carbon monoxide, carbon dioxide, and nitrogen, along with a small amount of carbon fibers, are drawn into the incinerator of the exhaust gas treatment equipment through a negative pressure exhaust pipe. After high-temperature aerobic incineration, the gas meets emission standards and is discharged into the atmosphere through a chimney. The smoothness of the exhaust gas discharge from the high-temperature carbonization furnace directly affects the carbon fiber production cycle and the final product quality.

[0004] In the existing technology, during the operation of the existing high-temperature carbonization furnace, after 3 to 5 days of operation, a large amount of fibrous material will be blocked in the main waste discharge pipe and the negative pressure control valve. The negative pressure control valve on the high-temperature carbonization furnace cannot be intelligently adjusted according to the pressure, resulting in a large amount of waste gas lingering in the high-temperature carbonization furnace and unable to be discharged normally, which affects the normal operation of carbon fiber.

[0005] In view of this, the present invention is proposed. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a high-temperature carbonization furnace exhaust gas system and its control method, so that the filaments can be effectively intercepted at the exhaust gas outlets on both sides of the high-temperature carbonization furnace and prevented from being sucked into the upper pipe by negative pressure.

[0007] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows:

[0008] In a first aspect, a high-temperature carbonization furnace grate exhaust gas system includes:

[0009] A high-temperature carbonization furnace, wherein a pressure transmitter is installed on the high-temperature carbonization furnace, and the pressure transmitter is used to monitor the pressure value inside the high-temperature carbonization furnace in real time.

[0010] The exhaust pipe is connected to both ends of the high-temperature carbonization furnace and to the incinerator.

[0011] A filter screen is installed inside the exhaust pipe to filter out lint in the exhaust pipe.

[0012] The first automatic control valve and the second automatic control valve are both installed on the exhaust pipe and are located on both sides of the filter screen respectively. A first nitrogen valve is installed on the exhaust pipe between the filter screen and the second automatic control valve. The first nitrogen valve is used to monitor the pressure value of the high-temperature carbonization furnace head in real time.

[0013] The control module is electrically connected to the first self-control valve, the second self-control valve, the first nitrogen valve, and the pressure transmitter, and is used to adjust the valve opening of the first self-control valve and the second self-control valve.

[0014] In a preferred embodiment of any of the above solutions, the exhaust pipe includes:

[0015] The main exhaust pipe is connected at one end to the incinerator;

[0016] The second branch pipe is connected at one end to the main exhaust pipe.

[0017] The third branch pipe has one end connected to the high-temperature carbonization furnace and the other end connected to the second branch pipe, and the filter screen is located at the intersection of the second branch pipe and the third branch pipe.

[0018] In a preferred embodiment of any of the above solutions, the exhaust pipe further includes:

[0019] The fourth branch pipe, one end of which is connected to the high-temperature carbonization furnace;

[0020] The first branch pipe has one end connected to the main exhaust pipe and the other end connected to the fourth branch pipe.

[0021] In a preferred embodiment of any of the above solutions, the lint-filtering device further includes:

[0022] It is installed on the second branch pipe and is close to the flange of the filter screen.

[0023] In a preferred embodiment of any of the above solutions, the lint-filtering device further includes:

[0024] It is installed on the third branch pipe and is close to the cleaning hole of the filter screen.

[0025] In a preferred embodiment of any of the above solutions, the lint-filtering device further includes:

[0026] A negative pressure control valve is located on the main exhaust pipe and is electrically connected to the control module.

[0027] In a preferred embodiment of any of the above solutions, the lint-filtering device further includes:

[0028] The third self-regulating valve is located on the first branch pipe and is electrically connected to the control module.

[0029] In a preferred embodiment of any of the above solutions, the lint-filtering device further includes:

[0030] The second nitrogen valve is installed on the fourth branch pipe and is used to monitor the pressure value at the tail of the high-temperature carbonization furnace in real time and transmit the pressure value at the tail of the furnace to the control module.

[0031] The fourth self-control valve is installed on the fourth branch pipe and located between the second nitrogen valve and the high-temperature carbonization furnace, and is connected to the control module.

[0032] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art.

[0033] By connecting the exhaust pipe to both ends of the high-temperature carbonization furnace and the incinerator, and installing a filter screen inside the exhaust pipe to filter out lint in the exhaust pipe, the lint is effectively intercepted at the exhaust gas outlets on both sides of the high-temperature carbonization furnace and is not sucked into the upper pipe by negative pressure. By installing the first and second automatic control valves on the exhaust pipe and located on both sides of the filter screen, they can be closed separately for cleaning, which completely solves the problem of blockage of the exhaust gas pipe and pressure regulating valve of the high-temperature carbonization furnace, extending the production time from 3-5 days to 45 days.

[0034] Secondly, a control method for a high-temperature carbonization furnace exhaust gas system, the control method comprising the following steps:

[0035] Obtain the pressure threshold P2 and the pressure value P1 inside the high-temperature carbonization furnace;

[0036] Calculate the pressure difference P0 between the pressure value P1 inside the furnace and the pressure threshold P2, wherein the pressure difference P0 is proportional to the valve opening of the first automatic control valve and the second automatic control valve. When the pressure difference P0 > 0, the valve opening of the first automatic control valve is larger, and when the difference P0 < 0, the valve opening of the first automatic control valve is smaller.

[0037] Adjust the valve openings of the first automatic control valve, the negative pressure control valve, the second automatic control valve, the third automatic control valve, and the fourth automatic control valve according to the magnitude of the pressure difference P0.

[0038] In a preferred embodiment of any of the above solutions, adjusting the valve opening of the first self-control valve and the second self-control valve further includes the following steps:

[0039] If the valve opening of the first self-control valve and the second self-control valve is between 20% and 30%, the high-temperature carbonization furnace will operate normally.

[0040] If the valve opening of the first automatic control valve and the second automatic control valve is greater than 30% and less than 90%, an initial warning will occur.

[0041] If the valve opening of the first and second automatic control valves is ≥90%, an alarm will be triggered, and the high-temperature carbonization furnace will stop working.

[0042] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art.

[0043] As the number of fibers increases at the filter screen inside the pipeline, the opening of the first and second automatic control valves will increase according to the automatic adjustment to maintain the high-carbon furnace head pressure stable, thus realizing the function of intelligent automatic control.

[0044] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0045] The accompanying drawings, as part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation of the invention. Obviously, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0046] Figure 1 This is a schematic diagram of the high-temperature carbonization furnace exhaust gas system of the present invention.

[0047] Figure 2 This is a schematic diagram of the control method for the high-temperature carbonization furnace exhaust gas system of the present invention.

[0048] In the diagram: 1. High-temperature carbonization furnace; 2. Main exhaust pipe; 3. Negative pressure control valve; 4. Incinerator; 5. First automatic control valve; 6. Second automatic control valve; 7. First nitrogen valve; 8. Cleaning hole; 9. Filter screen; 10. Flange; 11. Third automatic control valve; 12. Pressure transmitter; 13. Control module; 14. First branch pipe; 15. Second branch pipe; 16. Third branch pipe; 17. Fourth branch pipe; 18. Second nitrogen valve; 19. Fourth automatic control valve.

[0049] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0051] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0052] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0053] like Figure 1 As shown, the present invention provides a high-temperature carbonization furnace exhaust gas system, including a high-temperature carbonization furnace 1, wherein a pressure transmitter 12 is installed on the high-temperature carbonization furnace 1, and the pressure transmitter 12 is used to monitor the pressure value inside the high-temperature carbonization furnace 1 in real time.

[0054] The exhaust pipe is connected to both ends of the high-temperature carbonization furnace 1 and to the incinerator 4;

[0055] Filter screen 9 is installed inside the exhaust pipe to filter out lint in the exhaust pipe.

[0056] The first automatic control valve 5 and the second automatic control valve 6 are both installed on the exhaust pipe and are located on both sides of the filter screen 9 respectively. A first nitrogen valve 7 is installed on the exhaust pipe between the filter screen 9 and the second automatic control valve 6. The first nitrogen valve 7 is used to monitor the pressure value of the furnace head of the high-temperature carbonization furnace 1 in real time.

[0057] The control module 13 is electrically connected to the first self-control valve 5, the second self-control valve 6, the first nitrogen valve 7 and the pressure transmitter 12 respectively, and is used to adjust the valve opening of the first self-control valve 5 and the second self-control valve 6.

[0058] In the high-temperature carbonization furnace exhaust gas system described in this embodiment of the invention, the exhaust pipe is connected to both ends of the high-temperature carbonization furnace 1 and to the incinerator 4. A filter screen 9 is installed inside the exhaust pipe to filter out lint from the exhaust gas. This effectively intercepts the lint at the exhaust gas outlets on both sides of the high-temperature carbonization furnace, preventing it from being sucked into the upper pipe by negative pressure. This prevents the lint from entering the main exhaust pipe, causing blockage of the main pipe and pressure control valve, thus forcing a shutdown. By installing the first automatic control valve 5 and the second automatic control valve 6 on the exhaust pipe, respectively located on both sides of the filter screen 9, they can be closed individually. The cleaning process completely resolved the blockage of exhaust gas pipes and pressure regulating valves in the high-temperature carbonization furnace, extending production time from 3-5 days to 45 days. In this embodiment, the filter screen 9 can adopt an arc-shaped structure with a higher center and lower sides, thus increasing the contact area with the fibers during use and further filtering the fibers. The pressure transmitter 12 converts the pressure signal inside the high-temperature carbonization furnace 1 into a 4-20mA current signal and transmits the information to the control module 13. Therefore, the electronic signal pressure of the pressure transmitter 12 has a linear relationship with the magnitude of voltage or current, generally a direct proportional relationship. Thus, the voltage or current output by the transmitter increases with increasing pressure. The pressure transmitter 12 is an electric pressure transmitter, and the output signal of the electric pressure transmitter is a 0-10mA DC signal.

[0059] like Figure 1 As shown, the exhaust pipe includes:

[0060] The main exhaust pipe 2 is connected at one end to the incinerator 4;

[0061] The second branch pipe 15 is connected at one end to the main exhaust pipe 2;

[0062] The third branch pipe 16 is connected at one end to the high-temperature carbonization furnace 1 and at the other end to the second branch pipe 15, and the filter screen 9 is located at the intersection of the second branch pipe 15 and the third branch pipe 16.

[0063] In the high-temperature carbonization furnace exhaust gas system described in this embodiment of the invention, one end of the main exhaust pipe 2 is connected to the incinerator 4 by screws, which can be easily disassembled and assembled. The second branch pipe 15 is connected to the main exhaust pipe 2 by screws, which can be easily assembled. The third branch pipe 16 intersects with the third branch pipe 16 and is perpendicular to each other. The filter screen 9 is installed in the second branch pipe 15 by screws and is close to the intersection of the third branch pipe 16 and the third branch pipe 16. Therefore, when in use, the filaments that enter the second branch pipe 15 through the third branch pipe 16 can be filtered, preventing them from entering the second branch pipe 15.

[0064] like Figure 1 As shown, the exhaust pipe further includes:

[0065] The fourth branch pipe 17, one end of which is connected to the high-temperature carbonization furnace 1;

[0066] The first branch pipe 14 has one end connected to the main exhaust pipe 2 and the other end connected to the fourth branch pipe 17.

[0067] In the high-temperature carbonization furnace exhaust gas system described in this embodiment of the invention, during installation, one end of the first branch pipe 14 is connected to the main exhaust pipe 2 by screws, and the other end of the first branch pipe 14 is connected to the fourth branch pipe 17 by screws, which allows for easy disassembly and assembly. During installation, the first branch pipe 14 and the second branch pipe 15 are symmetrical to each other, and a filter screen 9 for filtering fibrous material is also provided inside the first branch pipe 14. In this way, the fibrous material discharged from the tail end of the high-temperature carbonization furnace 1 can be filtered, making it convenient to use.

[0068] like Figure 1 As shown, the lint filter device further includes:

[0069] It is installed on the second branch pipe 15 and close to the flange 10 of the filter screen 9.

[0070] In the high-temperature carbonization furnace grate exhaust gas system described in this embodiment of the invention, a flange 10 is provided on the second branch pipe 15, and the flange 10 is located close to the filter screen 9. Therefore, when it is necessary to clean the filter screen 9, the flange 10 can be opened to remove the filter screen 9 and then replace it, which is convenient for cleaning. Similarly, a flange 10 is also provided inside the first branch pipe 14, at a position corresponding to the second branch pipe 15. Therefore, when it is necessary to clean the filter screen inside the first branch pipe 14, the flange 10 can be opened to replace the filter screen, which is convenient for use.

[0071] like Figure 1As shown, the lint filter device further includes:

[0072] It is installed on the third branch pipe 16 and is close to the cleaning hole 8 of the filter screen 9.

[0073] In the high-temperature carbonization furnace exhaust gas system described in this embodiment of the invention, to facilitate the cleaning of the lint on one side of the filter screen, a cleaning hole 8 for cleaning the lint can be provided on the third branch pipe 16. When there is a large amount of lint, the cleaning hole 8 can be opened to clean the lint on one side of the filter screen, thus facilitating use. For further convenience, a cleaning hole can also be provided on the fourth branch pipe 17 at a position corresponding to the third branch pipe 16. In this way, the lint located in the first branch pipe 14 can be cleaned through this cleaning hole, making it even more convenient to use. When the lint in the pipeline filter lint device accumulates a lot and the pressure of the high-carbon furnace rises, reaching 15pa-20pa, the valves before and after the pipeline filter lint device on one side can be closed, and online cleaning can be performed through the cleaning hole.

[0074] like Figure 1 As shown, the lint filter device further includes:

[0075] The negative pressure control valve 3 is located on the main exhaust pipe 2, and the negative pressure control valve 3 is electrically connected to the control module 13.

[0076] In the high-temperature carbonization furnace exhaust gas system described in this embodiment of the invention, when installed, the negative pressure control valve 3 is installed on the exhaust main pipe 2 close to the incinerator 4, which can improve the control of the negative pressure control valve 3, thereby regulating the gas discharged into the incinerator 4 and making it convenient to use.

[0077] like Figure 1 As shown, the lint filter device further includes:

[0078] The third self-regulating valve 11 is located on the first branch pipe 14 and is electrically connected to the control module 13; the filter filament device further includes:

[0079] The second nitrogen valve 18 is installed on the fourth branch pipe 17 and is used to monitor the pressure value at the tail of the high-temperature carbonization furnace 1 in real time and transmit the pressure value at the tail to the control module 13.

[0080] The fourth automatic control valve 19 is installed on the fourth branch pipe 17 and located between the second nitrogen valve 18 and the high-temperature carbonization furnace 1, and is connected to the control module 13.

[0081] In the high-temperature carbonization furnace exhaust gas system described in this embodiment of the invention, during installation, the third automatic control valve 11 is installed on the first branch pipe 14, and the second nitrogen valve 18 and the fourth automatic control valve 19 are installed on the fourth branch pipe 17, providing a nitrogen sealing function. By adjusting the third automatic control valve 11 and the fourth automatic control valve 19, a positive pressure seal of nitrogen in the filter section of the pipeline is ensured, preventing air from entering the high-temperature carbonization furnace and avoiding oxidation inside the furnace. Nitrogen is introduced into the pipeline through the nitrogen sealing pipe. The opening degree of the third automatic control valve 11 and the fourth automatic control valve 19 can be manually adjusted to increase or decrease the nitrogen flow according to actual production needs. The flow rate is adjusted to maintain positive pressure within the pipeline and the high-temperature carbonization furnace. When a large amount of lint needs to be removed from the filter screen, the two valves on the same side of the high-temperature carbonization furnace 1 can be closed via the third automatic control valve 11, the fourth automatic control valve 19, the first automatic control valve 5, and the second automatic control valve 6. This keeps one side of the high-temperature carbonization furnace 1 closed and the other side open, allowing for cleaning of the lint from the filter screen without affecting the overall normal operation of the device. This prevents lint from entering the second branch pipe 15 and the first branch pipe 14, avoiding blockages that could force a shutdown. Therefore, it has the functions of online individual switching and online cleaning. It can perform individual online cleaning according to the actual production situation on site, achieving the effect of maintaining continuous production without stopping the cleaning of the high-carbon furnace waste discharge pipeline. Before the installation of the pipeline filter bristle device of this invention, after 3-5 days of continuous production, the main waste discharge pipeline and negative pressure control valve of the high-carbon furnace would be blocked by bristles. It is necessary to stop the production line to clean the main waste discharge pipeline and negative pressure control valve. The high-temperature carbonization furnace on site can no longer continue production. Only by stopping the entire line and disassembling and cleaning the waste discharge pipeline of the high-temperature carbonization furnace can the conditions for the next production be met. Installing the pipeline filter bristle device of this invention After the production line operated continuously for more than 45 days, the condition of the main exhaust pipe and negative pressure control valve of the high-carbon furnace was observed. There was no blockage, and production could continue and the production conditions were met. After the modification of the pipeline with a filter fiber device, the problem of blockage in the main pipeline and negative pressure control valve of the high-carbon furnace was completely solved. After installing the pipeline filter fiber device, the production time can be extended by more than 40 days. Based on the calculation of extending production by 40 days, the number of shutdowns can be reduced by 8, the output loss can be reduced by 6.4 tons / month, continuous production increases the stability of product quality, reduces the generation of defective products by 7.68 tons, and can generate more than 1.1 million yuan in output value per month.

[0082] Secondly, such as Figure 1 and Figure 2 As shown, a control method for a high-temperature carbonization furnace grate exhaust gas system includes the following steps:

[0083] Obtain the pressure threshold P2 and the pressure value P1 inside the high-temperature carbonization furnace 1;

[0084] Calculate the pressure difference P0 between the pressure value P1 inside the furnace and the pressure threshold P2, wherein the pressure difference P0 is proportional to the valve opening of the first automatic control valve 5 and the second automatic control valve 6. When the pressure difference P0 > 0, the valve opening of the first automatic control valve 5 is larger, and when the difference P0 < 0, the valve opening of the first automatic control valve 5 is smaller.

[0085] Adjust the valve openings of the first automatic control valve 5, the negative pressure control valve 3, the second automatic control valve 6, the third automatic control valve 11, and the fourth automatic control valve 19 according to the magnitude of the pressure difference P0.

[0086] like Figure 1 and Figure 2 As shown, adjusting the valve opening of the first self-control valve 5 and the second self-control valve 6 further includes the following steps:

[0087] If the valve opening of the first automatic control valve 5 and the second automatic control valve 6 is between 20% and 30%, the high-temperature carbonization furnace 1 will operate normally.

[0088] If the valve opening of the first automatic control valve 5 and the second automatic control valve 6 is greater than 30% and less than 90%, an initial warning will occur.

[0089] If the valve opening of the first automatic control valve 5 and the second automatic control valve 6 is ≥90%, an alarm will be triggered, and the high-temperature carbonization furnace 1 will stop working.

[0090] In the control method of the high-temperature carbonization furnace exhaust gas system described in this embodiment of the invention, the pressure on the high-temperature carbonization furnace 1 is monitored by the first nitrogen valve 7, the second automatic control valve 6, the first automatic control valve 5, the fourth automatic control valve 19, the second nitrogen valve 18, and the third automatic control valve 11 on the third branch pipe 16. The pressure value P1 inside the furnace is the average of the pressure inside the furnace, the pressure at the furnace head, and the pressure at the furnace tail. The first nitrogen valve 7, the second automatic control valve 6, the first automatic control valve 5, and the fourth automatic control valve 11 on the third branch pipe 16 are adjusted based on the calculated pressure difference P0. 19. The opening degree of the second nitrogen valve 18 and the third automatic control valve 11 will increase as the lint on the filter screen inside the pipeline increases, according to automatic adjustment, to maintain a stable high-carbon furnace head pressure. When the valve opening reaches 90%, an alarm will sound, prompting the on-site operator that the lint on the filter screen inside the pipeline is severely clogged and needs to be cleaned. At this time, the on-site operator will clean the lint on the alarmed pipeline online. After cleaning, normal operation will be restored. This realizes intelligent automatic control and alarm functions without the need for personnel supervision. The on-site operator only needs to clean the lint on the alarmed pipeline online after the alarm is triggered.

[0091] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art.

[0092] By connecting the exhaust pipe to both ends of the high-temperature carbonization furnace 1 and the incinerator 4, and installing the filter screen 9 inside the exhaust pipe to filter out the lint in the exhaust pipe, the lint is effectively intercepted at the exhaust gas outlets on both sides of the high-temperature carbonization furnace and is not sucked into the upper pipe by the negative pressure. By installing the first automatic control valve 5 and the second automatic control valve 6 on the exhaust pipe and located on both sides of the filter screen 9, they can be closed separately for cleaning, which completely solves the problem of blockage of the exhaust gas pipe and pressure regulating valve of the high-temperature carbonization furnace, and extends the production time from 3-5 days to 45 days.

[0093] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. The implementation schemes in the above embodiments can also be further combined or replaced. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A high-temperature carbonization furnace exhaust gas system, characterized in that, The system includes: A high-temperature carbonization furnace (1) is provided with a pressure transmitter (12) installed on the high-temperature carbonization furnace (1). The pressure transmitter (12) is used to monitor the pressure value inside the high-temperature carbonization furnace (1) in real time. The exhaust pipe is connected to both ends of the high-temperature carbonization furnace (1), and one end of the exhaust main pipe (2) is connected to the incinerator (4); one end of the second branch pipe (15) is connected to the exhaust main pipe (2); one end of the third branch pipe (16) is connected to the high-temperature carbonization furnace (1), and the other end is connected to the second branch pipe (15); the filter screen (9) is installed at the intersection of the second branch pipe (15) and the third branch pipe (16) by screws, and is used to filter the lint in the exhaust pipe; a cleaning hole (8) is set near the filter screen (9) on the third branch pipe (16), which is used to open the cleaning hole (8) after closing the valves on both sides of the filter screen (9) to clean the lint on one side of the filter screen (9); The first self-control valve (5) and the second self-control valve (6) are both installed on the exhaust pipe and are located on both sides of the filter screen (9). A first nitrogen valve (7) is installed on the exhaust pipe between the filter screen (9) and the second self-control valve (6). The first nitrogen valve (7) is used to monitor the pressure value of the furnace head of the high-temperature carbonization furnace (1) in real time. The control module (13) is electrically connected to the first self-control valve (5), the second self-control valve (6), the first nitrogen valve (7), and the pressure transmitter (12), and is used to adjust the valve opening of the first self-control valve (5) and the second self-control valve (6); the opening of the first self-control valve (5) and the second self-control valve (6) is related to the nitrogen flow rate, and is used to adjust the pressure in the exhaust pipe and the furnace in the high-temperature carbonization furnace (1), and to perform nitrogen sealing.

2. The high-temperature carbonization furnace exhaust gas system according to claim 1, characterized in that, The exhaust pipe also includes: The fourth branch pipe (17) is connected at one end to the high-temperature carbonization furnace (1); The first branch pipe (14) is connected at one end to the exhaust main pipe (2) and at the other end to the fourth branch pipe (17).

3. The high-temperature carbonization furnace exhaust gas system according to claim 2, characterized in that, Also includes: The flange (10) is located on the second branch pipe (15) and close to the filter screen (9).

4. The high-temperature carbonization furnace exhaust gas system according to claim 3, characterized in that, Also includes: The negative pressure control valve (3) is located on the main exhaust pipe (2) and is electrically connected to the control module (13).

5. The high-temperature carbonization furnace exhaust gas system according to claim 4, characterized in that, Also includes: The first branch pipe (14) is connected at both ends to the exhaust main pipe (2) and the fourth branch pipe (17), respectively; The third self-control valve (11) is located on the first branch pipe (14) and is electrically connected to the control module (13).

6. The high-temperature carbonization furnace exhaust gas system according to claim 5, characterized in that, Also includes: The second nitrogen valve (18) is installed on the fourth branch pipe (17) and is used to monitor the pressure value at the tail of the high-temperature carbonization furnace (1) in real time and transmit the pressure value at the tail to the control module (13). The fourth self-control valve (19) is installed on the fourth branch pipe (17) and located between the second nitrogen valve (18) and the high-temperature carbonization furnace (1), and is connected to the control module (13).

7. A method for controlling the exhaust gas system of a high-temperature carbonization furnace as described in any one of claims 1 to 6, characterized in that, The control method includes the following steps: Obtain the pressure threshold P2 and the pressure value P1 inside the high-temperature carbonization furnace (1); Calculate the pressure difference P0 between the pressure value P1 in the furnace and the pressure threshold P2, wherein the pressure difference P0 is proportional to the valve opening of the first automatic control valve (5) and the second automatic control valve (6). When the pressure difference P0 > 0, the valve opening of the first automatic control valve (5) is larger, and when the difference P0 < 0, the valve opening of the first automatic control valve (5) is smaller. Adjust the valve opening of the first self-control valve (5), the negative pressure control valve (3), the second self-control valve (6), the third self-control valve (11) and the fourth self-control valve (19) according to the magnitude of the pressure difference P0.

8. The control method for the exhaust gas system of a high-temperature carbonization furnace according to claim 7, characterized in that, It also includes the following steps: If the valve opening of the first self-control valve (5) and the second self-control valve (6) is between 20% and 30%, the high-temperature carbonization furnace (1) will operate normally. If the valve opening of the first self-control valve (5) and the second self-control valve (6) is greater than 30% and less than 90%, an initial warning will occur. If the valve opening of the first self-control valve (5) and the second self-control valve (6) is ≥90%, an alarm will be triggered, the high-temperature carbonization furnace (1) will stop working, and the on-site operator will be prompted that the filter screen in the pipeline is severely clogged with lint and needs to be cleaned.

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