CN-121994012-A - Control method and system for air inlet and outlet process of oven

CN121994012ACN 121994012 ACN121994012 ACN 121994012ACN-121994012-A

Abstract

The invention provides a control method and a control system for an air inlet and exhaust process of an oven, which are applied to an oven set, wherein the oven set comprises a front m-section oven and a rear n-section oven, waste gas of the front m-section oven is high-concentration waste gas, waste gas of the rear n-section oven is low-concentration waste gas, the method comprises the steps of directly feeding the high-concentration waste gas into RTO, exchanging heat between the low-concentration waste gas and fresh air, concentrating the low-concentration waste gas by a zeolite rotating wheel, feeding the concentrated waste gas into the RTO to obtain mixed waste gas, remotely and automatically controlling parameters such as a valve, a fan and the like through an Internet of things by setting the temperature and pressure difference of each section oven and VOC concentration parameter of the last section oven, achieving the oven process requirement through the lowest energy consumption, utilizing waste heat of the ovens and the RTO to improve heat recovery efficiency, reduce energy consumption, heating condensed water by using waste heat generated by the mixed waste gas through a boiler, regenerating condensed water into high-temperature steam, and heating fresh air by the high-temperature steam.

Inventors

ZHANG YAN
Lv Die
HU JINFU
Bu Hugan
JIN JIAYING
TANG HAIJIANG

Assignees

宁波激智科技股份有限公司

Dates

Publication Date: 20260508
Application Date: 20260227

Claims (10)

1. The control method of the air inlet and outlet process of the oven is characterized by being applied to an oven set, wherein the oven set comprises a front m-section oven and a rear n-section oven, the waste gas of the front m-section oven is high-concentration waste gas, and the waste gas of the rear n-section oven is low-concentration waste gas, and the method comprises the following steps: directly feeding the high-concentration waste gas into RTO, exchanging heat between the low-concentration waste gas and fresh air, concentrating the waste gas by a zeolite rotating wheel, and feeding the waste gas into the RTO to obtain mixed waste gas; The frequency of the exhaust fan and the air intake machine is automatically regulated in linkage according to the opening degree of the air intake valve and the air exhaust valve of each section of oven, so that the negative pressure value of each section of oven is controlled to reach a set concentration threshold value, and the concentration of the last section of oven is controlled to reach or be lower than the set concentration threshold value; heating condensed water by waste heat generated by burning the mixed waste gas through a boiler, and regenerating the condensed water into high-temperature steam; And heating the fresh air through the high-temperature steam.
2. The control method of an air intake and exhaust process of an oven according to claim 1, wherein each section of the oven is provided with a differential pressure meter, and the negative pressure value of each section of the oven is controlled to reach a set concentration threshold value by adjusting the opening degrees of an air intake valve and an air exhaust valve, comprising: And if the current negative pressure value is smaller than a set negative pressure value, the system automatically adjusts the exhaust valve until the current negative pressure value reaches the set negative pressure value.
3. The method for controlling an air intake and exhaust process of an oven according to claim 1, wherein the last oven section is provided with a PID concentration detector, and the controlling the concentration of the last oven section to be equal to or lower than the set concentration threshold value comprises: And if the VOC concentration of the last section of oven is larger than the set concentration threshold value, synchronously regulating the opening of all the air inlet valves and the opening of all the air exhaust valves until the VOC concentration reaches or is lower than the set concentration threshold value.
4. The method for controlling an air intake and exhaust process of an oven according to claim 1, wherein a differential pressure meter is arranged in the main air duct for exhausting exhaust air, the method further comprising: The waste gas adsorption fan automatically adjusts the frequency according to the set negative pressure value of the air pipe.
5. The method for controlling an oven air intake and exhaust process according to claim 1, wherein the main air intake pipe is provided with a thermocouple and an anemometer, the method further comprising: adjusting the opening of an outsourcing steam valve according to the set air inlet temperature, so as to control the temperature of all the ovens; And remotely checking the air quantity of the air inlet and outlet main air pipe.
6. The method for controlling the air intake and exhaust process of the oven according to claim 1, wherein the concentration of the high concentration waste gas is higher than 1500mg/m 3 , the temperature of the high concentration waste gas is 80 ℃, the concentration of the low concentration waste gas is lower than 500mg/m 3 , and the temperature of the low concentration waste gas is 100 ℃.
7. The method for controlling an air intake and exhaust process of an oven according to claim 1, wherein the concentration of the mixed waste gas is more than 3000mg/m 3 , and the concentration threshold value of the last oven is set to be 1mg/m 3 .
8. The method for controlling an air inlet and outlet process of an oven according to claim 1, wherein m is 2 and n is 4.
9. The control system of the air inlet and outlet process of the oven is characterized by being applied to an oven set, wherein the oven set comprises a front m-section oven and a rear n-section oven, the waste gas of the front m-section oven is high-concentration waste gas, the waste gas of the rear n-section oven is low-concentration waste gas, and the system comprises: The mixing module is used for directly feeding the high-concentration waste gas into RTO, exchanging heat between the low-concentration waste gas and fresh air, concentrating the low-concentration waste gas by the zeolite rotating wheel, and feeding the concentrated low-concentration waste gas into the RTO to obtain mixed waste gas; The control module is used for controlling the negative pressure value of each section of the oven to reach a set concentration threshold value and controlling the concentration of the last section of oven to reach or be lower than the set concentration threshold value by adjusting the opening degrees of the air inlet valve and the air outlet valve and automatically adjusting the frequency of the air outlet fan and the air inlet machine according to the opening degree of the air inlet valve and the air outlet valve of each section of oven in an interlocking way; The heating module is used for heating condensed water through a boiler by waste heat generated by burning the mixed waste gas, regenerating the condensed water into high-temperature steam and heating the fresh air through the high-temperature steam.
10. An electronic device comprising a memory, a processor, the memory having stored thereon a computer program executable on the processor, characterized in that the processor implements the method of any of the preceding claims 1 to 8 when the computer program is executed.

Description

Control method and system for air inlet and outlet process of oven Technical Field The invention relates to the technical field of optical films, in particular to a control method and a control system for an air inlet and outlet process of an oven. Background Most of the traditional ovens are provided with an air inlet and outlet fan and a heat supply valve for manual field control to adjust parameters in the ovens, and the concentration and positive and negative pressure in the ovens cannot be observed in a visual way due to the lack of monitoring parameter related instruments and intelligent control, so that the most proper temperature and air inlet and outlet wind speed required by the ovens cannot be accurately set to achieve the lowest energy consumption, and basically no heat recovery process or low heat recovery efficiency are achieved. Each section of oven is provided with a pair of air inlet and exhaust fans independently, the maintenance of the fans is troublesome, and the energy consumption is high. Disclosure of Invention In view of the above, the invention aims to provide a control method and a system for an air inlet and outlet process of an oven, which are used for accurately setting the air inlet and outlet parameters of each section of oven by remotely and interlockingly controlling the air inlet and outlet pipe valve through the Internet of things, and achieving the process requirement of the oven with the lowest energy consumption, and improving the heat recovery efficiency and reducing the energy consumption by utilizing the waste heat of the oven and RTO. In a first aspect, an embodiment of the present invention provides a method for controlling an air intake and exhaust process of an oven, which is applied to an oven set, where the oven set includes a front m-section oven and a rear n-section oven, exhaust gas of the front m-section oven is high-concentration exhaust gas, and exhaust gas of the rear n-section oven is low-concentration exhaust gas, and the method includes: directly feeding the high-concentration waste gas into RTO, exchanging heat between the low-concentration waste gas and fresh air, concentrating the waste gas by a zeolite rotating wheel, and feeding the waste gas into the RTO to obtain mixed waste gas; The frequency of the exhaust fan and the air intake machine is automatically regulated according to the linkage of the opening degree of the air intake valve and the opening degree of the air exhaust valve of each section of oven, so that the negative pressure value of each section of oven is controlled to reach a set concentration threshold value, and the concentration of the last section of oven is controlled to reach or be lower than the set concentration threshold value; heating condensed water by waste heat generated by burning the mixed waste gas through a boiler, and regenerating the condensed water into high-temperature steam; And heating the fresh air through the high-temperature steam. Further, each section the oven is provided with a differential pressure meter, and the negative pressure value of each section of the oven is controlled to reach a set concentration threshold value by adjusting the opening degrees of an air inlet valve and an air exhaust valve, comprising: And if the current negative pressure value is smaller than a set negative pressure value, the system automatically adjusts the exhaust valve until the current negative pressure value reaches the set negative pressure value. Further, the last section of oven is provided with PID concentration detector, through adjusting the aperture of air inlet valve and exhaust valve, the concentration of control last section of oven reaches or is less than set for concentration threshold value, includes: And if the VOC concentration of the last section of oven is larger than the set concentration threshold value, synchronously regulating the opening of all the air inlet valves and the opening of all the air exhaust valves until the VOC concentration reaches or is lower than the set concentration threshold value. Further, a differential pressure meter is arranged in the main exhaust pipe of the exhaust gas, and the method further comprises the following steps: The waste gas adsorption fan automatically adjusts the frequency according to the set negative pressure value of the air pipe. Further, the main air inlet pipeline is provided with a thermocouple and an anemometer, and the method further comprises: adjusting the opening of an outsourcing steam valve according to the set air inlet temperature, so as to control the temperature of all the ovens; And remotely checking the air quantity of the air inlet and outlet main air pipe. Further, the concentration of the high-concentration exhaust gas is higher than 1500mg/m 3, the temperature of the high-concentration exhaust gas is 80 ℃, the concentration of the low-concentration exhaust gas is lower than 500mg/m 3, and the temperature of the low-concentration exha