Automatic safe ignition method for converter diffusion chimney

Abstract

The invention relates to an automatic safe ignition method for a converter diffusion chimney, which comprises the following steps of: 1, mounting a direct-fired high-altitude ignition co-combustion device at the head of a diffusion pipe, 2, mounting an infrared laser temperature detector and a high-pressure generation conditioner on a diffusion chimney platform, 3, mounting a high-voltage cable and a supporting assembly, and 4, mounting a high-voltage cable and a supporting assembly. 4, designing and installing an ignition combustion-accompanying master controller cabinet and a PLC safe ignition control system, 5, installing and debugging a nitrogen purging system, and 6, controlling the automatic safe ignition system. According to the technical scheme, carbon monoxide generated in the smelting process of the converter is efficiently and safely ignited in the diffusion chimney, unburned converter gas is prevented from being discharged to the atmosphere, and the problems of gas poisoning of personnel and excessive carbon emission are avoided.

Description

Technical Field

[0001] The invention relates to a safe ignition method, in particular to an automatic safe ignition method for a converter emission chimney, and belongs to the technical field of safety and environmental protection. Background Art

[0002] Waste gas is generated during converter smelting. At present, the methods for waste gas dust removal in China are mainly divided into dry dust removal system and wet dust removal system. The process flow of the wet dust removal system is that a large amount of high-temperature (1450℃) and dusty flue gas generated by converter smelting, with a dust concentration of 80-150g / m3, is captured by the active smoke hood, cooled to about 1000℃ through the vaporization flue, and the preliminarily cooled flue gas is sprayed with water through the primary dust collector to cool and remove large particles of dust. After passing through the dehydration tower to remove the water in the flue gas, the flue gas that meets the recycling conditions is recycled, and the flue gas that does not meet the recycling conditions is discharged into the atmosphere after combustion through the venting chimney. In order to ensure the safety of the converter gas recovery process, the converter gas shall not be discharged directly into the atmosphere without combustion, so as to avoid environmental pollution and gas poisoning accidents. At present, there are two ways to burn chimney gas at home and abroad. One is "eternal lamp" combustion, that is, a ring pipe is installed at the top of the venting tower, and combustible gas is passed into the ring pipe for uninterrupted combustion. When there is converter gas in the venting chimney, the "eternal lamp" ignites the converter gas to achieve zero emission of carbon monoxide. This method is safe and reliable, but the uninterrupted gas consumption is huge. The cost of coke oven gas consumed by the "eternal lamp" of a converter venting chimney is more than 2.69 million yuan, and the carbon emissions are also very large. Another method is a new technology developed in recent years, a direct-fired automatic ignition and burning system that does not use a fuel gas source. The biggest advantage of this system is that when the system detects that the converter gas is coming out of the chimney and the carbon monoxide content reaches the set concentration value, the system uses the elevator arc emitted by the high-voltage igniter to complete the automatic ignition, without consuming the burning gas, saving a lot of energy, and also greatly reducing carbon emissions. Therefore, this method is constantly used in the metallurgical and chemical fields. However, this method also has a fatal disadvantage. The automatic ignition device is installed on the top of the discharge tower which is tens to hundreds of meters high. The ignition process is seriously affected by the external environment, such as heavy rain, strong wind, uneven flue gas flow rate, flue gas humidity, etc. The success rate of igniting the gas by the arc generated by the automatic catalyst and the high-voltage igniter is less than 100%, which poses a great safety hazard. The unburned converter gas is directly discharged into the atmosphere. The converter gas discharged into the atmosphere floats to the nearby operating room under the influence of wind force and direction, causing gas poisoning to personnel. How to avoid this situation? At present, there are no specific control measures at home and abroad. Summary of the invention

[0003] The present invention is aimed at the problems existing in the prior art and provides a method for automatically and safely igniting a converter venting chimney. This technical solution can efficiently and safely ignite the carbon monoxide generated in the converter smelting process in the venting chimney, prevent the unburned converter gas from being discharged into the atmosphere, and avoid problems such as gas poisoning and excessive carbon emissions.

[0004] In order to achieve the above object, the technical solution of the present invention is as follows: a method for automatically and safely igniting a converter chimney, the method comprising the following steps:

[0005] Step 1: Install a direct-burning high-altitude ignition and burning device at the head of the vent pipe; Step 2: Install an infrared laser temperature detector and a high-voltage generator on the vent chimney platform; Step 3: Install high-voltage cables and support components; Step 4: Design and install the ignition and burning main controller cabinet and PLC safety ignition control system; Step 5: Install and debug the nitrogen purge system: Step 6: Control method of the automatic safety ignition system; Details are as follows:

[0006] Among them, the first step is to install a direct-burning high-altitude ignition burner at the head of the vent pipe.

[0007] Specifically, the venting tower adopts the ignition method of direct-fired high-altitude ignition companion burner + auxiliary gas source, and the auxiliary gas source is coke oven gas. Each venting chimney is equipped with 4 sets of ignition companion burners, of which venting chimneys 1-3# are direct-fired ignition companion burners, and 4# is a coke oven gas source ignition companion burner. Under normal circumstances, 1-3# direct-fired ignition companion burners are ignited at the same time. The coke oven gas source ignition companion burner is used as a backup igniter and is ignited immediately when the ignition detection is unsuccessful. This solution adopts the ignition method of direct-fired high-altitude ignition companion burner + auxiliary gas source, which avoids the ignition failure caused by the direct-fired high-altitude ignition companion burner being affected by external environmental heavy rain, strong winds, uneven flue gas flow rate, flue gas humidity, etc., and the unburned gas is discharged into the atmosphere, causing gas poisoning of personnel and excessive carbon emissions.

[0008] The second step is to install an infrared laser temperature detector and a high-voltage generator conditioner on the venting chimney platform. Specifically, four infrared laser temperature detectors are installed on the venting chimney platform. The infrared laser temperature detectors are aimed at the venting chimney torch head in the east, south, west and north directions to detect whether the converter gas is successfully ignited. Since the high-altitude flame is greatly affected by the external wind volume and wind speed, this detection method adopts a redundant detection judgment method, that is, as long as two or more of the temperatures detected by any two infrared laser temperature detectors installed in the east, south, west and north directions meet the set temperature T℃, the ignition is judged to be successful. This scheme uses an infrared laser temperature detector for the venting tower flame. The infrared laser temperature detector is a non-contact temperature detector with a faster response speed than the traditional thermocouple temperature measurement. It can reduce the discharge time of the high-voltage igniter, which is beneficial to extend the service life of the ignition head and reduce the use of catalysts. The four infrared laser temperature detectors detect in different directions to ensure the accuracy of flame detection.

[0009] The third step: installation of high-voltage cables and supporting components, as follows: after the main control system obtains the start-up ignition signal, it feeds 220V AC power to the high-voltage generator and conditioner. The high-voltage electricity generated by the high-voltage generator and conditioner is sent to the elevator arc generating device in the high-altitude ignition companion burner through the high-voltage cable to generate a surface arc. At the same time, the released converter gas is automatically introduced into the direct-fired high-altitude igniter. Under the action of the catalytic reaction, flames are ejected from the upper part of the high-altitude ignition companion burner to ignite the converter gas.

[0010] Step 4: Design and installation of the ignition and co-burning main control cabinet and PLC safety ignition control system. The details are as follows: The nitrogen purge pipeline is connected to the rear end of the 4# coke oven gas source ignition and co-burning device pipeline shut-off valve mentioned in the first part, and the pipeline is purged at the specified interval to prevent the pipeline from being blocked by coking coal tar due to long-term non-opening. The nitrogen purge control program is set in the PLC system. When the converter smelts N furnaces or the nitrogen shut-off valve is not opened for N1 hours, the nitrogen shut-off valve is opened during the converter "furnace interval" time to purge the 4# coking coal gas pipeline. When the purge reaches the set time t2 or the converter "furnace starts", the purge ends automatically. This plan regularly uses high-pressure nitrogen to purge the auxiliary gas source pipeline to prevent the pipeline from being blocked by fuel gas due to long-term non-opening, affecting the gas circulation and causing ignition failure.

[0011] Step 5: Installation and commissioning of nitrogen purge system. Details are as follows: The s7-1200 controller, relays, contactors, switches and other components required by the system are installed in the main control cabinet for ignition and co-firing. The PLC control system collects the carbon monoxide component concentration value from the cold end of the converter, the temperature detected by the infrared laser, the open and close signals of the three-way valve sent by the converter PLC, the "start of the furnace" and "end of the furnace" signals of the converter process oxygen step, the open and close signals of the 4# coke oven gas source cut-off valve, and the open and close signals of the nitrogen purge system gas source cut-off valve; the PLC control system is responsible for issuing high-voltage ignition commands, controlling the ignition time, issuing the open and close commands of the 4# coke oven gas source cut-off valve, and the open and close commands of the nitrogen purge system gas source cut-off valve.

[0012] Step 6: The control method of the automatic safety ignition system is as follows:

[0013] System operation mode 1:

[0014] When the venting chimney PLC control system receives the "heat start" signal from the converter and the three-way valve is in the "venting position" and the carbon monoxide concentration from the converter "cold end analysis" reaches more than 12%, the venting chimney PLC control system issues a high-pressure start ignition command to 1-3# direct-fired igniters, and the command time lasts for t seconds. At the same time, 4 infrared laser temperature detectors send the detected temperature values ​​to this PLC system. Due to the influence of the high-altitude air volume direction, when the temperature values ​​detected by two infrared temperature detectors reach the system set value T℃ at the same time within the system required command time t seconds, it is judged that the automatic ignition system has successfully ignited. The venting chimney PLC control system issues a high-pressure stop ignition command to 1-3# direct-fired igniters.

[0015] System operation mode 2:

[0016] When the venting chimney PLC control system receives the "heat start" signal from the converter and the three-way valve is in the "venting position" and the carbon monoxide concentration from the converter "cold end analysis" reaches more than 12%, the venting chimney PLC control system issues a high-pressure start ignition command to 1-3# direct-fired igniters, and the command time lasts for t seconds. At the same time, 4 infrared laser temperature detectors send the detected temperature values ​​to this PLC system. When the temperature values ​​detected by two of the infrared temperature detectors do not reach the system set value T℃ at the same time within the system required command time t seconds, it is judged that the automatic ignition system has failed to ignite. The venting chimney PLC control system issues a high-pressure stop ignition command to 1-3# direct-fired igniters. The venting chimney PLC control system issues an open command to the coke coal pipeline shut-off valve of the 4# coke oven gas source ignition companion burner. After the PLC system receives the open signal from the coke coal pipeline shut-off valve, the PLC control system issues a high-pressure start ignition command to the 4# coke oven gas source ignition companion burner. When the temperature values ​​detected by two infrared temperature detectors reach the system set value T℃ within the command time t1 seconds required by the system, it is judged that the automatic ignition system has successfully ignited. The venting chimney PLC control system issues a high-pressure stop ignition command to the 4# coke oven gas source ignition companion burner, and issues a closing command to the coke coal pipeline shut-off valve of the 4# coke oven gas source ignition companion burner. When the PLC system does not receive an open signal from the coke coal pipeline shut-off valve or the flame temperature does not reach the set temperature T℃ at t1, the system reports a venting system fault, sends a fault command to the converter PLC system, and the converter stops blowing. This solution fully considers the shortcomings of direct-fired automatic ignition technology. When the 1-3# direct-fired igniter fails to ignite, the auxiliary gas control mode is enabled to ignite the converter gas. This method is very effective.

[0017] Compared with the prior art, the present invention has the following advantages. The present method combines the new technology developed at present - direct-fired automatic ignition and burning, adopts the ignition mode of the direct-fired high-altitude ignition and burning device + auxiliary gas source of the venting tower, and adds the function of regular high-pressure nitrogen purge in the ignition mode of the auxiliary gas source. The original direct-fired automatic ignition and burning system is seriously affected by the external environment, such as heavy rain, strong wind, uneven flue gas flow rate, flue gas humidity, etc. The ignition mode of the direct-fired high-altitude ignition and burning device + auxiliary gas source of the venting tower can improve the success rate of automatic ignition of the venting tower, and increase the smelting chain of the converter when the ignition fails, which 100% ensures that the unburned converter gas will not be directly discharged into the atmosphere, reduces the carbon emissions of the enterprise, and eliminates the safety hazard of gas poisoning of personnel. The implementation of this method fills the gap in the current industry that the direct-fired automatic ignition and burning failure leads to gas discharge into the atmosphere and gas poisoning of personnel. This method can be used in flue gas venting towers such as blast furnaces and converters, has a wide range of applications, and has very good development prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Automatic ignition control flow chart

[0019] Figure 2 This is the purge control flow chart. DETAILED DESCRIPTION

[0020] In order to deepen the understanding of the present invention, the present embodiment is described in detail below with reference to the accompanying drawings.

[0021] Example 1: See Figure 1 , Figure 2 A method for automatically and safely igniting a converter venting chimney comprises the following steps: the first step: installing a direct-fired high-altitude ignition companion burner at the head of the venting pipe,

[0022] Specifically, the venting tower adopts the ignition method of high-altitude ignition companion burner + auxiliary gas source, and the auxiliary gas source adopts coke oven gas. Each venting chimney is equipped with 4 sets of ignition companion burners, among which venting chimneys 1-3# are direct-fired ignition companion burners, and 4# is a coke oven gas source ignition companion burner. Under normal circumstances, 1-3# direct-fired ignition companion burners are ignited at the same time, and the system operation mode 1 described in this article is used for control execution. The coke oven gas source ignition companion burner is used as a backup igniter, and it is ignited immediately when the ignition detection is unsuccessful. It is controlled and executed using the system operation mode 2 described in this article.

[0023] The second step is to install an infrared laser temperature detector and a high-voltage generator regulator on the venting chimney platform.

[0024] Specifically, four infrared laser temperature detectors are installed on the venting chimney platform. The infrared laser temperature detectors are aimed at the venting chimney torch head in four directions: east, south, west, and north, to detect whether the converter gas is successfully ignited. Since the high-altitude flame is greatly affected by the external wind volume and wind speed, this detection method adopts a redundant detection judgment method, that is, as long as two or more temperatures detected by any two infrared laser temperature detectors installed in the east, south, west, and north directions meet the set temperature T>50°C, the ignition is judged to be successful.

[0025] Step 3: Installation of high voltage cables and support components.

[0026] The details are as follows: the high-voltage generator conditioner, high-voltage cable and supporting components are constructed, installed and debugged according to the drawings. After the main control system receives the start-up ignition signal from the PLC, it feeds 220V AC power to the high-voltage generator conditioner. The high-voltage electricity generated by the high-voltage generator conditioner is sent to the elevator arc generating device in the high-altitude ignition companion burner through the high-voltage cable to generate a surface arc. At the same time, the emitted converter gas is automatically introduced into the direct-fired high-altitude igniter. Under the action of the catalytic reaction, flames are ejected from the upper part of the high-altitude ignition companion burner to ignite the converter gas.

[0027] Step 4: Design and install the ignition and combustion master control cabinet and PLC safety ignition control system. Figure 2 )

[0028] The details are as follows: the nitrogen purge pipeline is connected to the rear end of the 4# coke oven gas source ignition and flaring device pipeline cut-off valve AV2 mentioned in the first part. The nitrogen purge control program is set in the PLC system. When the converter smelts 60 furnaces or the nitrogen cut-off valve AV1 is not opened for 24 hours, the nitrogen cut-off valve AV1 is opened during the "furnace interval" of the converter to purge the 4# coke gas pipeline. When the purge reaches the set time t2 = 60s or the converter "furnace starts", the purge ends automatically.

[0029] Step 5: Install and debug the nitrogen purge system. Figure 1 )

[0030] The details are as follows: The s7-1200 controller, relays, contactors, switches and other components required by the system are installed in the main control cabinet for ignition and co-firing. The PLC control system collects the carbon monoxide component concentration value from the cold end of the converter, the temperature detected by the infrared laser, the open and close signals of the three-way valve sent by the converter PLC, the "start of the furnace" and "end of the furnace" signals of the converter process oxygen step, the open and close signals of the 4# coke oven gas source cut-off valve, and the open and close signals of the nitrogen purge system gas source cut-off valve; the PLC control system is responsible for issuing high-voltage ignition commands, controlling the ignition time, and issuing the open and close commands of the 4# coke oven gas source cut-off valve and the open and close commands of the nitrogen purge system gas source cut-off valve.

[0031] Step 6: Control method of automatic safety ignition system.

[0032] System operation mode 1:

[0033] When the venting chimney PLC control system receives the "heat start" signal from the converter and the three-way valve is in the "venting position" and the carbon monoxide concentration from the converter "cold end analysis" reaches more than 12%, the venting chimney PLC control system issues a high-pressure start ignition command to 1-3# direct-fired igniters, and the command time lasts t=10 seconds. At the same time, 4 infrared laser temperature detectors send the detected temperature values ​​to this PLC system. Due to the influence of the high-altitude air volume direction, when the temperature values ​​detected by two infrared temperature detectors reach the system setting value T>50℃ at the same time within the system required command time t seconds, it is judged that the automatic ignition system has successfully ignited. The venting chimney PLC control system issues a high-pressure stop ignition command to 1-3# direct-fired igniters.

[0034] System operation mode 2:

[0035] When the venting chimney PLC control system receives the "heat start" signal from the converter and the three-way valve is in the "venting position" and the carbon monoxide concentration from the converter "cold end analysis" reaches more than 12%, the venting chimney PLC control system issues a high-pressure start ignition command to 1-3# direct-fired igniters, and the command time lasts t=10 seconds. At the same time, 4 infrared laser temperature detectors send the detected temperature values ​​to this PLC system. When the temperature values ​​detected by two of the infrared temperature detectors do not reach the system set value T>50℃ within the system required command time t=10 seconds, it is judged that the automatic ignition system has failed to ignite. The venting chimney PLC control system issues a high-pressure stop ignition command to 1-3# direct-fired igniters. The venting chimney PLC control system issues an opening command to the coke coal pipeline shut-off valve of the 4# coke oven gas source ignition companion burner. After the PLC system receives the opening signal from the coke coal pipeline shut-off valve, the PLC control system issues a high-pressure start ignition command to the 4# coke oven gas source ignition companion burner. When the temperature values ​​detected by two infrared temperature detectors reach the system set value T>50℃ within the command time t1=15 seconds required by the system, it is judged that the automatic ignition system has successfully ignited. The venting chimney PLC control system issues a high-pressure stop ignition command to the 4# coke oven gas source ignition companion burner, and issues a closing command to the coke coal pipeline shut-off valve of the 4# coke oven gas source ignition companion burner. When the PLC system does not receive the opening signal from the coke coal pipeline shut-off valve or the flame temperature does not reach the set temperature T>50℃ at t1=15, the PLC system reports a venting system failure, sends the failure command to the converter PLC system, and the converter stops blowing.

[0036] Comparison of the implementation effect of this method in the experimental section: Before February 2022, three 150T converters in a steelmaking plant adopted "eternal lamp" combustion, that is, an annular tube was installed at the top of the venting tower, and combustible gas was introduced into the annular tube for uninterrupted combustion. When there was converter gas in the venting chimney, the "eternal lamp" ignited the converter gas to achieve zero emission of carbon monoxide. This method is safe and reliable, but the uninterrupted gas consumption is huge. The coke oven gas consumed by the "eternal lamp" of the three converter venting chimneys is 3942000m 3 / year, the "eternal lamp" using coke oven gas as fuel gas consumes a value of 8.065 million yuan / year, and the carbon emissions are also very large.

[0037] In February 2022, a steelmaking chimney was transformed for energy saving, and a direct-fired automatic ignition and burning system produced by a Beijing company was adopted. The successful application of the direct-fired automatic ignition and burning system in a steelmaking greatly reduced the coke oven gas. However, from March to October 2022, there were 16 converter shutdowns due to ignition failure of the direct-fired automatic ignition and burning system, and the automatic ignition success rate was 84% ​​(10021 furnaces in 7 months of steelmaking), which seriously affected the converter production.

[0038] In February 2023, a steelmaking plant added an auxiliary plate burning system to the direct-fired automatic ignition and burning system, which adopted the ignition method of the direct-fired high-altitude ignition and burning device and the auxiliary gas source and the high-pressure nitrogen purge control function of the coking coal pipeline, and improved the original flame detection thermocouple to infrared laser temperature detection. During the experimental stage, after 6 months of field testing, there was no converter shutdown caused by ignition failure of the direct-fired automatic ignition and burning system, and the automatic ignition success rate reached 100% (9662 furnaces of molten steel in 6 months), and the implementation effect was very good.

[0039] It should be noted that the above embodiments are not intended to limit the protection scope of the present invention, and equivalent changes or substitutions made on the basis of the above technical solutions all fall within the protection scope of the claims of the present invention.

Claims

1. A method for automatic and safe ignition of a converter venting chimney, characterized in that: The method The following steps are involved: Step 1: Install a direct-burning high-altitude ignition companion burner at the head of the vent pipe. The second step is to install an infrared laser temperature detector and a high-voltage generator on the venting chimney platform. Step 3: Installation of high voltage cables and support components. Step 4: Design and installation of ignition and combustion master controller cabinet and PLC safety ignition control system. Step 5: Installation and commissioning of nitrogen purge system. Step 6: Control method of automatic safety ignition system.

2. The automatic and safe ignition method for converter venting chimney according to claim 1 is characterized in that: The first step: install a direct-fired high-altitude ignition companion burner at the head of the vent pipe, as follows: the vent tower adopts the ignition method of a direct-fired high-altitude ignition companion burner and an auxiliary gas source, the auxiliary gas source uses coke oven gas, and each vent chimney is equipped with 4 sets of ignition companion burners, namely 1#-4# ignition companion burners.

3. The automatic and safe ignition method for converter venting chimney according to claim 2 is characterized in that: The second step is to install infrared laser temperature detectors and high-voltage generator conditioners on the venting chimney platform. Specifically, four infrared laser temperature detectors are installed on the venting chimney platform. The infrared laser temperature detectors are aimed at the venting chimney torch head in four directions of east, south, west and north to detect whether the converter gas is successfully ignited. The detection method adopts a redundant detection judgment method, that is, as long as two or more temperatures detected by any two infrared laser temperature detectors installed in the east, south, west and north directions meet the set temperature T℃, it is determined that the ignition is successful.

4. The automatic and safe ignition method for converter venting chimney according to claim 3 is characterized in that: The third step: installation of high-voltage cables and supporting components, as follows: after the main control system obtains the start-up ignition signal, it feeds 220V AC power to the high-voltage generator and conditioner. The high-voltage electricity generated by the high-voltage generator and conditioner is sent to the elevator arc generating device in the high-altitude ignition companion burner through the high-voltage cable to generate a surface arc. At the same time, the released converter gas is automatically introduced into the direct-fired high-altitude igniter. Under the action of the catalytic reaction, flames are ejected from the upper part of the high-altitude ignition companion burner to ignite the converter gas.

5. The automatic safe ignition method for converter venting chimney according to claim 3 or 4, characterized in that: Step 4: Design and installation of the ignition and co-burning main controller cabinet and PLC safety ignition control system, as follows: The nitrogen purge pipeline is connected to the rear end of the 4# coke oven gas source ignition and co-burning device pipeline shut-off valve. The pipeline is purged at the specified interval to prevent the pipeline from being closed for a long time and the coking coal tar from clogging the pipeline. The nitrogen purge control program is set in the PLC system. When the converter smelts N furnaces or the nitrogen shut-off valve is not opened for N1 hours, the nitrogen shut-off valve is opened during the "furnace interval" time of the converter to purge the 4# coking coal gas pipeline. When the purge reaches the set time t2 or the converter "furnace starts", the purge ends automatically.

6. The automatic and safe ignition method for converter venting chimney according to claim 5, characterized in that: The fifth step: installation and commissioning of nitrogen purge system, as follows: the logic controller, relays, contactors and switch components required by the system are installed in the ignition and co-firing main control cabinet, the PLC control system collects the carbon monoxide component concentration value from the cold end of the converter, the temperature detected by the infrared laser, the open and close signals of the three-way valve sent by the converter PLC, the "start of the furnace" and "end of the furnace" signals of the converter process oxygen step, the open and close signals of the 4# coke oven gas source cut-off valve, and the open and close signals of the nitrogen purge system gas source cut-off valve; the PLC control system is responsible for issuing high-voltage ignition commands, controlling the ignition time, issuing open and close commands for the 4# coke oven gas source cut-off valve, and the open and close commands for the nitrogen purge system gas source cut-off valve.

7. The automatic and safe ignition method for converter venting chimney according to claim 6, characterized in that: Step 6: Control method of automatic safety ignition system; System operation mode 1: When the venting chimney PLC control system receives the "furnace start" signal from the converter and the three-way valve is in the "venting position" and the carbon monoxide concentration from the converter "cold end analysis" reaches more than 12%, the venting chimney PLC control system issues a high-pressure start ignition command to 1-3# direct-fired igniters, and the command time lasts for t seconds. At the same time, 4 infrared laser temperature detectors send the detected temperature values ​​to this PLC system. Due to the influence of the high-altitude air volume direction, when the temperature values ​​detected by two of the infrared temperature detectors reach the system set value T℃ at the same time within the system required command time t seconds, it is judged that the automatic ignition system has been successfully ignited, and the venting chimney PLC control system issues a high-pressure stop ignition command to 1-3# direct-fired igniters; System operation mode 2: When the venting chimney PLC control system receives the "furnace start" signal from the converter and the three-way valve is in the "venting position" and the carbon monoxide concentration from the converter "cold end analysis" reaches more than 12%, the venting chimney PLC control system issues a high-pressure start ignition command to 1-3# direct-fired igniters, and the command time lasts for t seconds. At the same time, 4 infrared laser temperature detectors send the detected temperature values ​​to this PLC system. When the temperature values ​​detected by two of the infrared temperature detectors do not reach the system set value T℃ at the same time within the command time t seconds required by the system, it is judged that the automatic ignition system has failed to ignite, and the venting chimney PLC control system issues a high-pressure stop ignition command to 1-3# direct-fired igniters, and the venting chimney PLC control system issues a high-pressure stop ignition command to the coke pipeline shut-off valve of the 4# coke oven gas source ignition companion burner. An open command is issued, and after the PLC system receives the open signal from the coking coal pipeline shut-off valve, the PLC control system issues a high-pressure start ignition command to the 4# coke oven gas source ignition companion burner. When the temperature values ​​detected by two of the infrared temperature detectors reach the system set value T℃ within the command time t1 seconds required by the system, it is determined that the automatic ignition system has successfully ignited, and the venting chimney PLC control system issues a high-pressure stop ignition command to the 4# coke oven gas source ignition companion burner, and issues a closing command to the coking coal gas source pipeline shut-off valve of the 4# coke oven gas source ignition companion burner. When the PLC system does not receive the open signal from the coking coal pipeline shut-off valve or the flame temperature does not reach the set temperature T℃ at t1, the system reports a venting system fault, and sends the fault command to the converter PLC system, and the converter stops blowing.

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