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CN-117166091-B - High-temperature carbonization grate waste gas system and control method thereof

CN117166091BCN 117166091 BCN117166091 BCN 117166091BCN-117166091-B

Abstract

The invention discloses a high-temperature carbonization grate waste gas system and a control method thereof, wherein the waste gas discharge system comprises a high-temperature carbonization furnace, a filter screen, a first automatic control valve and a second automatic control valve, wherein the filter screen is arranged in an exhaust pipeline and is used for filtering broken filaments in the exhaust pipeline, the first automatic control valve and the second automatic control valve are respectively arranged on the exhaust pipeline and are respectively positioned on two sides of the filter screen, a first nitrogen valve is arranged on the exhaust pipeline between the filter screen and the second automatic control valve and is used for monitoring the pressure value of a furnace end of the high-temperature carbonization furnace in real time, and the control module is respectively electrically connected with the first automatic control valve, the second automatic control valve, the first nitrogen valve and a pressure transmitter and is used for adjusting the valve opening sizes of the first automatic control valve and the second automatic control valve. The invention can effectively intercept the broken filaments at the exhaust gas outlets on the two sides of the high-temperature carbonization furnace, and the broken filaments are not sucked into the pipeline on the upper part by negative pressure.

Inventors

  • LU MING
  • SUN XIAOJUN

Assignees

  • 吉林国兴碳纤维有限公司
  • 吉林化纤集团有限责任公司

Dates

Publication Date
20260508
Application Date
20220526

Claims (8)

  1. 1. A high temperature carbonization grate exhaust gas system, said system comprising: The high-temperature carbonization furnace (1), wherein a pressure transmitter (12) is arranged on the high-temperature carbonization furnace (1), and the pressure transmitter (12) is used for monitoring the pressure value in the high-temperature carbonization furnace (1) in real time; The device comprises an exhaust pipeline, a third branch pipe (16), a filter screen (9), a cleaning hole (8) and a cleaning hole (8), wherein the exhaust pipeline is communicated with the head end and the tail end of a high-temperature carbonization furnace (1), one end of the exhaust main pipeline (2) is communicated with an incinerator (4), one end of the second branch pipe (15) is communicated with the exhaust main pipeline (2), one end of the third branch pipe (16) is communicated with the high-temperature carbonization furnace (1), the other end of the third branch pipe is communicated with the second branch pipe (15), the filter screen (9) is arranged at the intersection of the second branch pipe (15) and the third branch pipe (16) through a screw and is used for filtering broken filaments in the exhaust pipeline, and the third branch pipe (16) is close to the filter screen (9) and is used for cleaning broken filaments at one side of the filter screen (9) after valves at two sides of the filter screen (9) are closed; The first automatic control valve (5) and the second automatic control valve (6) are both arranged on the exhaust pipeline and are respectively positioned at two sides of the filter screen (9), a first nitrogen valve (7) is arranged on the exhaust pipeline between the filter screen (9) and the second automatic control valve (6), and the first nitrogen valve (7) is used for monitoring the pressure value of the furnace end of the high-temperature carbonization furnace (1) in real time; The control module (13) is respectively and electrically connected with the first automatic control valve (5), the second automatic control valve (6), the first nitrogen valve (7) and the pressure transmitter (12) and is used for adjusting the valve opening degree of the first automatic control valve (5) and the second automatic control valve (6), wherein the opening degree of the first automatic control valve (5) and the second automatic control valve (6) is related to the nitrogen inlet amount and is used for adjusting the pressure in an exhaust pipeline and the high-temperature carbonization furnace (1) and performing nitrogen sealing.
  2. 2. The high temperature carbonization grate exhaust gas system as set forth in claim 1 wherein said exhaust conduit further comprises: A fourth branch pipe (17), wherein one end of the fourth branch pipe (17) is communicated with the high-temperature carbonization furnace (1); and one end of the first branch pipe (14) is communicated with the main exhaust pipe (2), and the other end of the first branch pipe is communicated with the fourth branch pipe (17).
  3. 3. The high temperature carbonization grate exhaust gas system as set forth in claim 2 further comprising: and a flange (10) arranged on the second branch pipe (15) and close to the filter screen (9).
  4. 4. The high temperature carbonization grate exhaust gas system as set forth in claim 3 further comprising: the negative pressure control valve (3) is positioned on the main exhaust pipeline (2), and the negative pressure control valve (3) is electrically connected with the control module (13).
  5. 5. The high temperature carbonization grate exhaust gas system as set forth in claim 4 further comprising: A first branch pipe (14) with two ends respectively communicated with the main exhaust pipe (2) and a fourth branch pipe (17); And the third automatic control valve (11) is positioned on the first branch pipe (14) and is electrically connected with the control module (13).
  6. 6. The high temperature carbonization grate exhaust gas system as set forth in claim 5 further comprising: The second nitrogen valve (18) is arranged on the fourth branch pipe (17) and is used for monitoring the pressure value of the tail of the high-temperature carbonization furnace (1) in real time and transmitting the pressure value of the tail to the control module (13); And a fourth self-control valve (19) is arranged on the fourth branch pipe (17), is positioned between the second nitrogen valve (18) and the high-temperature carbonization furnace (1), and is connected with the control module (13).
  7. 7. A method of controlling a high temperature carbonization grate exhaust gas system according to any one of claims 1 to 6, characterized in that the control method comprises the steps of: Acquiring a pressure threshold value P 2 in the high-temperature carbonization furnace (1) and a pressure value P 1 in the furnace; calculating a pressure difference value P 0 between a pressure value P 1 in the furnace and a pressure threshold value P 2 , wherein the pressure difference value P 0 is in direct proportion to the valve opening of the first self-control valve (5) and the valve opening of the second self-control valve (6), when the pressure difference value P 0 is more than 0, the valve opening of the first self-control valve (5) is more, and when the difference value P 0 is less than 0, the valve opening of the first self-control valve (5) is less; And according to the magnitude of the pressure difference P 0 , regulating the valve opening 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).
  8. 8. The method of controlling a high temperature carbonization grate exhaust gas system according to claim 7, further comprising the steps of: If the valve opening of the first automatic control valve (5) and the valve opening of the second automatic control valve (6) are between 20 and 30 percent, the high-temperature carbonization furnace (1) works normally; if the valve opening of the first automatic control valve (5) and the second automatic control valve (6) is more than 30 percent and less than 90 percent, primary early warning occurs; If the opening degree of the first automatic control valve (5) and the opening degree of the second automatic control valve (6) are more than or equal to 90%, an alarm is given, the high-temperature carbonization furnace (1) stops working, and the on-site operators are prompted that the filigree blockage at the filter screen in the pipeline is seriously required to be cleaned.

Description

High-temperature carbonization grate waste gas system and control method thereof Technical Field The invention relates to the field of carbon fiber production equipment, in particular to a technology for filtering a high-temperature carbonization grate exhaust gas pipeline in the carbon fiber production process, and specifically relates to a high-temperature carbonization grate exhaust gas system and a control method thereof. Background High-temperature carbonization is a key process link in the production process of carbon fibers, and along with the increase of carbonization treatment temperature in the temperature range of 1000-1600 ℃, the content of C in the fibers is basically linearly increased, and non-carbon elements in the fibers are continuously removed, and C is continuously enriched. In the high-temperature carbonization process, the fibers release a plurality of small molecule byproducts while being converted into a disordered layer graphite structure, and the conversion of the PAN-based fiber structure determines the structure of the carbon fiber to a great extent, so that the mechanical, thermal, chemical, electrical and other properties of the carbon fiber are influenced. The exhaust emission of the high-temperature carbonization furnace directly affects the quality of the final finished product of the carbon fiber, and because the high-temperature carbonization furnace is a high-temperature area in the carbonization process, the exhaust generated in the high-temperature area contains byproducts HCN released by the small trapezoid structures in the crosslinking and polycondensation processes, and the release temperature of nitrogen is 900 ℃ later, so that the stability of N in the structure is shown. Generally, when the carbonization temperature is 1300 ℃, the carbon content is 92% or more, the residual nitrogen content is about 5%, and the nitrogen content is reduced to 1% -2% along with the gradual increase of the carbonization temperature. The byproducts of high-temperature carbonization, namely hydrogen cyanide, ammonia, carbon monoxide, carbon dioxide and nitrogen, are sucked into an incinerator of waste gas treatment equipment from a waste gas discharge pipeline with negative pressure, and after high-temperature aerobic incineration treatment, the gas reaches the standard and is discharged to the atmosphere through a chimney. Whether the exhaust gas of the high-temperature carbonization furnace is discharged smoothly directly influences the production operation time length of the carbon fiber and the quality of the final product. Among the prior art, current high temperature carbonization stove is in the operation in-process, and high temperature carbonization stove operation is 3~5 days, can cause a large amount of filigree to block up in exhaust trunk line and negative pressure control valve department, and the last negative pressure control valve of high temperature carbonization stove also can't carry out intelligent regulation according to the size of pressure, has caused a large amount of waste gas wandering and can't normally discharge in high temperature carbonization stove, influences carbon fiber's normal operating. The present invention has been made in view of this. Disclosure of Invention The invention aims to solve the technical problem of overcoming the defects of the prior art and provides a high-temperature carbonization grate waste gas system and a control method thereof, so that a broken filament can be effectively intercepted at waste gas outlets on two sides of a high-temperature carbonization furnace and is prevented from being sucked into a pipeline on the upper part by negative pressure. In order to solve the technical problems, the invention adopts the basic conception of the technical scheme that: In a first aspect, a high temperature carbonization grate exhaust gas system comprises: the high-temperature carbonization furnace is provided with a pressure transmitter which is used for monitoring the pressure value in the high-temperature carbonization furnace in real time; The exhaust pipeline is communicated with the head end and the tail end of the high-temperature carbonization furnace and is communicated with the incinerator; The filter screen is arranged in the exhaust pipeline and is used for filtering the hairline in the exhaust pipeline; The first automatic control valve and the second automatic control valve are both arranged on the exhaust pipeline and are respectively positioned at two sides of the filter screen, a first nitrogen valve is arranged on the exhaust pipeline between the filter screen and the second automatic control valve, and the first nitrogen valve is used for monitoring the pressure value of the furnace end of the high-temperature carbonization furnace in real time; And the control module is respectively and electrically connected with the first automatic control valve, the second automatic control valve, the first nitrogen valve and t