Automatic ignition control system for accident tail gas in polysilicon production

Abstract

The utility model discloses a kind of automatic ignition control systems of accident tail gas in polysilicon production, it is related to accident tail gas treatment technical field in polysilicon production, and it includes: DCS, accident tail gas diffusion unit, long-lasting light unit, fuel gas supply unit and ignition unit;The accident tail gas diffusion unit includes tail gas emission main pipe and buffer tank, buffer tank is connected with at least two levels of diffusion passage, two and above diffusion passage is equipped with instrument control valve, and pressure sensor is equipped on buffer tank;The long-lasting light unit includes one-to-one corresponding long-lasting light with each level diffusion passage;The fuel gas supply unit provides fuel gas source for long-lasting light;Ignition unit includes high-energy ignition gun, and high-energy ignition gun is set one-to-one with long-lasting light;DCS is respectively connected with pressure sensor, flow sensor, high-energy ignition gun and the instrument control valve control of each pipeline, solve the problem that existing polysilicon production accident tail gas treatment system exists invalid fuel consumption, lead to the problem of higher cost.

Description

Technical Field

[0001] This utility model relates to the field of accident exhaust gas treatment technology in polysilicon production, specifically to an automatic ignition control system for accident exhaust gas in polysilicon production. Background Technology

[0002] In the silane production process, silane accident exhaust gases are flammable and explosive, requiring harmless treatment through incineration devices such as silane flares. The core requirement of the incineration device is to ensure that the exhaust gases are ignited promptly and completely during the release of accident exhaust gases, preventing the spread of unburned exhaust gases and the resulting hazards. To meet the aforementioned ignition reliability requirements, traditional silane flare emergency exhaust gas incineration devices generally employ a continuous ignition system. This system is equipped with multiple igniters (i.e., continuous lamps), and all continuous lamps must maintain continuous combustion for 24 hours. This ensures a stable ignition source through continuous combustion of the continuous lamps, allowing the released emergency exhaust gas to immediately contact and ignite, eliminating incomplete combustion or safety hazards caused by delayed ignition. However, in actual industrial production scenarios, the frequency of silane accident exhaust gas releases is extremely low: if the production process is precisely controlled and the equipment operates stably, the interval between exhaust gas releases can be as long as several months, or even several years. This means that the continuous burners in traditional units are in a state of "no exhaust gas to burn" most of the time, resulting in a large amount of ineffective fuel gas consumption. From the perspective of production cost, this problem is particularly prominent: the price of natural gas purchased by factories is usually 2-5 yuan / cubic meter, and for large silane combustion accident flares, the number of continuous burners is usually 5-10, with a single flare system having a fuel gas combustion capacity of approximately 5 cubic meters per cubic meter. 3 / h, with a maximum consumption of up to 50m³ 3 Based on this, the fuel cost per hour for the continuous lamp of a single flare is approximately 250 yuan; if calculated based on an annual operation of more than 8,000 hours, the annual cost of fuel consumption for the continuous lamp alone would reach 2 million yuan. This traditional structural design not only wastes energy but also significantly increases production costs for enterprises. Therefore, how to reduce the ineffective fuel consumption of the continuous lamp and lower operating costs while ensuring the reliability of ignition of silane flare emergency exhaust gas has become a key technical problem that needs to be solved in existing silane flare emergency exhaust gas incineration devices. Summary of the Invention

[0003] The purpose of this invention is to solve the problem of high cost caused by ineffective fuel consumption in the existing accident exhaust gas treatment system in polysilicon production, and to propose an automatic ignition control system for accident exhaust gas in polysilicon production.

[0004] This utility model is achieved through the following technical solution: An automatic ignition control system for emergency exhaust gas in polysilicon production includes: a DCS, an emergency exhaust gas venting unit, a continuous lamp unit, a fuel gas supply unit, and an ignition unit. The accident exhaust gas venting unit includes an exhaust gas emission main pipe and a buffer tank. The buffer tank is connected to at least two venting channels. The pipe diameter of each venting channel increases in the direction of increasing exhaust gas treatment capacity. Instrument control valves are installed on the second and higher venting channels, and pressure sensors are installed on the buffer tank. The continuous light unit includes a continuous light corresponding to each venting channel, and the continuous light is used to ignite the exhaust gas discharged from the corresponding venting channel in case of an accident. The fuel gas supply unit provides fuel gas for the continuous lights. Instrument control valves are installed on the pipes connecting each continuous light to the fuel gas supply unit. A flow sensor is installed on the main gas supply pipe of the fuel gas supply unit. The ignition unit includes a high-energy ignition gun for igniting the continuous lamp, with each high-energy ignition gun corresponding to a continuous lamp. The DCS is connected to the pressure sensor, flow sensor, high-energy ignition gun, and instrument control valves on each pipeline.

[0005] Furthermore, it also includes a flame detection unit, which includes a flame detection device corresponding to each level of the continuous lamp, and the flame detection device is used to detect the flame status of the corresponding continuous lamp.

[0006] Furthermore, the flame detection device is an ultraviolet flame detection device or a sheathed thermocouple.

[0007] Furthermore, the buffer tank is connected to 2 to 5 venting channels.

[0008] Furthermore, the buffer tank is connected to three-stage venting channels, each for treating 100m³ of exhaust gas. 3 A primary venting channel with a capacity of / h and a 300m³ exhaust gas treatment capacity. 3 / h secondary venting channel and 600m³ exhaust gas treatment 3 / h three-level venting channel.

[0009] Furthermore, the instrument control valve is one of the following: a solenoid valve, a pneumatic valve, or a switching valve.

[0010] Compared with the prior art, the present invention has the following advantages and beneficial effects: This utility model proposes an automatic ignition control system for emergency exhaust gas in polysilicon production. By setting up an emergency exhaust gas venting unit with at least two venting channels, the pipe diameter of each venting channel increases progressively along the direction of exhaust gas treatment volume. During operation, the device guides the emergency exhaust gas to two or more venting channels with increasing pipe diameter and treatment volume, adapting to exhaust gas with different emission volumes and avoiding the problem of channel-flow mismatch. Simultaneously, only the primary automatic lamp burns continuously, while the secondary and higher automatic lamps are activated and ignited as needed via pressure interlocking with the intake buffer tank, significantly reducing unnecessary fuel gas consumption. Furthermore, using a DCS as the control core, and linking pressure sensors, flow sensors, high-energy ignition guns, and various instrument control valves, the entire process of "exhaust gas monitoring - channel / fuel gas valve opening / closing - automatic lamp ignition" can be automated without manual intervention, significantly improving emergency response speed, reducing manual operation risks, improving exhaust gas treatment efficiency and operational reliability, and reducing fuel costs.

[0011] Second, this utility model includes a flame detection unit comprising multiple flame detection devices, each corresponding to a single continuous light. This unit can monitor the flame status of the continuous lights in real time. If ignition fails or the flame goes out during operation, a signal can be promptly fed back to the DCS, effectively preventing the direct release of exhaust gases due to the continuous lights not burning properly, thus mitigating safety hazards such as explosions and the spread of toxic gases at the source. Simultaneously, this design can quickly identify continuous light outages, triggering the DCS to shut down the corresponding fuel valve or restart ignition, further reducing fuel waste. It also provides the DCS with crucial feedback signals for continuous light operation, helping the system adjust parameters promptly and enhancing overall operational reliability.

[0012] III. In this utility model, the flame detection device is preferably an ultraviolet flame detection device or a sheathed thermocouple, which can provide reliable detection solutions for different operating environments in polysilicon plants. For example, the ultraviolet flame detection device uses ultraviolet light to identify flames, has strong resistance to sunlight and dust interference, and has a fast response speed, making it suitable for scenarios that require rapid confirmation of flame status; the sheathed thermocouple determines the presence of flames by monitoring the temperature of the continuous lamp area, has excellent high temperature resistance and vibration resistance, and is suitable for the high-temperature and harsh environment of the flare system. Both can accurately identify the flame status, avoid misjudgment or missed judgment, provide accurate basis for DCS control, and ensure the safe and stable operation of the system.

[0013] Fourth, in this utility model, the buffer tank is connected to 2 to 5 venting channels, which can cover common accident exhaust gas scenarios in polysilicon production and meet the requirements of graded treatment. It can also avoid the increase in equipment complexity, procurement, installation and maintenance costs due to too many channels, thus achieving a balance between "functional satisfaction" and "cost controllability". At the same time, this design is adaptable to polysilicon plants of different sizes. Small plants can choose 2 to 3 channels and large plants can choose 4 to 5 channels, without the need to design separate systems for plants of different sizes, thus improving the versatility of the technical solution.

[0014] V. This utility model proposes a superior automatic ignition control system, which designs a three-stage venting channel, with each stage corresponding to a 100m... 3 / h, 300m 3 / h, 600m 3 With a waste gas treatment capacity of / h, its treatment capacity gradient is highly compatible with the typical emission volume of accidental waste gas in polysilicon production. This can minimize "channel opening redundancy" by only activating channels and emergency lights that match the waste gas volume, further reducing fuel gas consumption and equipment operating load.

[0015] VI. In this utility model, the instrument control valve is preferably a solenoid valve or a pneumatic control valve, which can ensure the reliable operation and scenario adaptability of the valve in the flare system: the solenoid valve has a fast response speed and simple control logic, and is suitable for scenarios where polysilicon equipment suddenly leaks and needs to quickly open the venting channel and fuel gas valve; the pneumatic control valve is resistant to high temperature and corrosion and has high control accuracy, and is suitable for the harsh operating environment of the flare system with high temperature and corrosive exhaust gas; at the same time, both are mature products in the industrial field, with wide procurement channels, easy access to spare parts, and low maintenance technical threshold, which can reduce system downtime caused by valve failure, reduce the later maintenance cost of polysilicon plants, and ensure the long-term stable operation of the ignition control system. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of an automatic ignition control system. Figure 1 .

[0017] Figure 2 This is a schematic diagram of an automatic ignition control system. Figure 2 .

[0018] Figure 3 This is a schematic diagram of an automatic ignition control system. Figure 3 .

[0019] The components are as follows: 1. DCS; 2. Primary venting channel; 3. Secondary venting channel; 4. Tertiary venting channel; 5. Primary automatic light; 6. Secondary automatic light; 7. Tertiary automatic light; 8. Switch valve I; 9. Switch valve II; 10. Switch valve III; 11. Switch valve IV; 12. Exhaust gas emission main pipe; 13. Buffer tank; 14. Pressure sensor; 15. Fuel gas pipeline; 16. Flow sensor; 17. High-energy ignition gun I; 18. High-energy ignition gun II; 19. High-energy ignition gun III; 20. Flame detection device I; 21. Flame detection device II; 22. Flame detection device III; 23. Combustion tower. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to embodiments, but the implementation of the present invention is not limited thereto.

[0021] Example 1 An automatic ignition control system for accident exhaust gas in polysilicon production includes: DCS1, an accident exhaust gas venting unit, a continuous lamp unit, a fuel gas supply unit, and an ignition unit, to ensure that the accident exhaust gas is completely combusted in the combustion tower 21.

[0022] refer to Figure 1 The accident exhaust gas venting unit includes an exhaust gas emission main pipe 12 and a buffer tank 13. The buffer tank 13 is connected to two-stage venting channels, namely a primary venting channel 2 and a secondary venting channel 3. The pipe diameter of each venting channel increases in the direction of increasing exhaust gas treatment capacity (i.e., the pipe diameter of the secondary venting channel 3 is larger than that of the primary venting channel 2). The primary venting channel 2 is equipped with a switch valve I8 (in this embodiment, all instrument control valves are switch valves, which have relatively low cost). The buffer tank 13 is equipped with a pressure sensor 14.

[0023] The continuous light unit includes a continuous light corresponding to each venting channel. The continuous light is used to ignite the emergency exhaust gas discharged from the corresponding venting channel. That is, there is a primary continuous light 5 and a secondary continuous light 6, which are used to ignite the emergency exhaust gas discharged from the primary venting channel 2 and the secondary venting channel 3, respectively. Among them, the primary continuous light 5 corresponding to the primary venting channel 2 is kept in a continuous burning state.

[0024] The fuel gas supply unit provides fuel gas for the continuous lamp. Since the primary continuous lamp 5 needs to maintain continuous combustion, a regular valve is sufficient to connect the primary continuous lamp 5 to the fuel gas supply unit. The secondary continuous lamp 6 is connected to the fuel gas supply unit via a switching valve III 10. A flow sensor 16 is installed on the fuel gas pipeline 15 of the fuel gas supply unit.

[0025] The ignition unit includes a high-energy ignition gun I17 and a high-energy ignition gun II18 for igniting the primary lamp 5 and the secondary lamp 6, respectively.

[0026] DCS1 is connected to pressure sensor 14, flow sensor 16, high-energy ignition gun I 17, high-energy ignition gun II 18, switching valve I 8, and switching valve III 10 for control.

[0027] In practical applications, the switching valve involved can be selected from one of the instrument control valves, such as solenoid valves or pneumatic valves, depending on the on-site working conditions.

[0028] Example 2 This embodiment differs from Embodiment 1 in that it further includes a flame detection unit. This flame detection unit includes a flame detection device corresponding to each level of the continuous lamp, used to detect the flame state of the corresponding continuous lamp. (Reference) Figure 2The flame detection unit includes flame detection device I 20 and flame detection device II 21. Flame detection device I 20 is used to detect the flame status of the corresponding primary continuous lamp 5, and flame detection device II 21 is used to detect the flame status of the corresponding secondary continuous lamp 6.

[0029] Example 3 The difference between this embodiment and embodiments 1-2 is that the flame detection device is an ultraviolet flame detection device or a sheathed thermocouple.

[0030] Example 4 Compared with Examples 1 to 3, the difference in this embodiment is that the buffer tank 13 is connected to 2 to 5 venting channels.

[0031] Example 5 The difference between this embodiment and embodiment 4 is that, in reference... Figure 3 The buffer tank 13 is connected to three-stage venting channels, each for treating 100m³ of exhaust gas. 3 2. Primary venting channel 2, treating exhaust gas 300m³ / h 3 / h secondary venting channel 3 and 600m³ treatment exhaust gas 3 / h three-level venting channel 4.

[0032] Example 6 To facilitate public understanding of this utility model, this embodiment takes a superior automatic ignition control system for accident exhaust gas in polycrystalline silicon production as an example to further illustrate this solution.

[0033] For details, please refer to Figure 3 It includes: DCS1, emergency exhaust gas venting unit, continuous light unit, fuel gas supply unit, and ignition unit, to ensure complete combustion of emergency exhaust gas in combustion tower 21. In this embodiment, all instrument control valves are on / off valves.

[0034] In this embodiment, the emergency exhaust gas venting unit includes an exhaust gas main pipe 12 and a buffer tank 13. The buffer tank 13 is connected to a three-stage venting channel 4, and the diameter of each venting channel increases progressively along the direction of increasing exhaust gas treatment capacity. A pressure sensor 14 is installed on the buffer tank 13.

[0035] The pipe diameter and exhaust gas treatment capacity for each level of channel are matched as follows: Primary venting channel 2: Pipe diameter (DN) is 100, designed exhaust gas treatment capacity is 100m³. 3 / h, connected in parallel to the outlet of buffer tank 13 (connected to exhaust gas emission main pipe 12).

[0036] Secondary venting channel 3: Pipe diameter (DN) is 200, designed exhaust gas treatment capacity is 300m³. 3 / h, connected in parallel to the outlet of buffer tank 13 (connected to exhaust gas emission main pipe 12).

[0037] Stage 3 venting channel 4: Pipe diameter (DN) is 300, designed exhaust gas treatment capacity is 600m³. 3 / h, connected in parallel to the outlet of buffer tank 13 (connected to exhaust gas emission main pipe 12).

[0038] All venting channel inlets are connected to the silane flare emergency exhaust pipe 12 (DN400) via buffer tank 13 (20m³). 3 Connect the exhaust gas to ensure that the pressure is stabilized before it is released in separate channels.

[0039] The secondary venting channel 3 is equipped with a switch valve I8, the tertiary venting channel 4 is equipped with a switch valve II9, and the buffer tank 13 is equipped with a pressure sensor 14.

[0040] In this embodiment, the continuous light unit includes a continuous light corresponding to each venting channel, which is used to ignite the exhaust gas discharged from the corresponding venting channel. Specifically, the first-stage continuous light 5 corresponding to the first-stage venting channel 2 remains continuously burning.

[0041] The fuel gas supply unit provides fuel gas for the night lamps. Each night lamp is connected to the fuel gas supply unit via a pipe equipped with an instrument control valve (in this embodiment, an on / off valve is used). The fuel gas supply unit is equipped with a flow sensor 16 on its main gas supply pipe.

[0042] The specific configuration is as follows: It is equipped with three levels of continuous lighting (corresponding to three levels of venting channels), and all fuel gas is natural gas. Specific parameters are as follows: Level 5 automatic light: The fuel gas supply pipeline (DN20) is kept constantly open, and the combustion rate is stable at 10m³. 3 / h, installed directly below the exhaust gas outlet of the first-stage venting channel 2 (ensure the flame covers the exhaust gas outlet). Secondary automatic light 6: Fuel gas supply pipeline (DN25) connected in series with switch valve Ⅲ10, combustion capacity 15m³ 3 / h, installed directly below the exhaust gas outlet of the secondary venting channel 3; Level 3 continuous light 7: Fuel gas supply pipeline (DN32) connected in series with switch valve IV11, combustion capacity 20m³ 3 / h, installed directly below the exhaust gas outlet of the third-stage venting channel 4; The total fuel gas combustion volume of the three-stage continuous lamp is 45m³. 3 / h.

[0043] A pressure sensor 14 is installed on the pressure interlock buffer tank 13, which communicates with DCS1, and the pressure threshold is set as follows: Level 1 pressure alarm threshold: ≤10kPa (which can be met by using Level 1 venting channel 2); Secondary ignition trigger threshold: 10kPa<P≤20kPa (greater than the primary alarm threshold, triggering the secondary continuous light 6); Level 3 ignition trigger threshold: >20kPa (greater than the Level 2 trigger threshold, triggering Level 3 continuous light 7); All thresholds can be directly modified through the DCS1 operating interface to adapt to fluctuations in exhaust emissions under different production conditions.

[0044] In this embodiment, the ignition unit includes a high-energy ignition gun for igniting the continuous lamp. Each high-energy ignition gun is correspondingly positioned to ignite a continuous lamp, and the ignition tip is 50mm from the fuel gas outlet of the continuous lamp to ensure a high ignition success rate. (Reference) Figure 3 The ignition unit includes high-energy ignition gun I17, high-energy ignition gun II18 and high-energy ignition gun III19, which are used to ignite the primary continuous lamp 5, the secondary continuous lamp 6 and the tertiary continuous lamp 7, respectively.

[0045] In this embodiment, the flame detection unit includes flame detection devices I 20, II 21, and III 22, which correspond one-to-one with the primary continuous lamp 5, secondary continuous lamp 6, and tertiary continuous lamp 7, respectively. These devices are used to detect the flame state of the corresponding continuous lamp. All flame detection devices in this embodiment employ armored thermocouples. The detection end of the flame detection device is aligned with the core region of the continuous lamp flame, and the response time is ≤0.1s.

[0046] The flame detection device is interlocked with DCS1: If no flame signal is detected within 5 seconds after ignition, DCS1 will automatically re-trigger the corresponding high-energy ignition gun (up to 2 times). If it still fails, an audible and visual alarm will be issued to prompt manual inspection.

[0047] DCS1 is connected to pressure sensor 14, flow sensor 16, each high-energy ignition gun, and instrument control valves on each pipeline.

[0048] More specifically, the system control method is as follows: 1. Initial state (low exhaust emissions).

[0049] When the silane production unit only produces a small amount of accidental exhaust gas (e.g., 80m³), 3 When the exhaust gas is at a certain speed ( / h), the exhaust gas enters the buffer tank 13 through the exhaust gas emission main pipe 12, and the pressure inside the tank stabilizes at 0.005MPa (below the first-level alarm threshold of 0.01MPa). Only the primary venting channel 2 is open (exhaust gas treatment capacity matched to 80m³). 3 / h), the first-level permanent lamp 5 is kept burning (fuel gas 10m3 / h) to ensure that the exhaust gas is safely released after combustion; When the secondary and tertiary venting channels 4 are closed, the corresponding fuel gas switch valves I8 and II9 for the continuous light are also closed, and there is no fuel gas consumption in the secondary and tertiary venting channels 4.

[0050] 2. Secondary night light triggers 6 times (medium exhaust emissions).

[0051] When the equipment malfunction worsened, the exhaust emissions increased to 320m³. 3 At a rate of / h, the pressure in intake buffer tank 13 rises to 0.015MPa (reaching the secondary trigger threshold): DCS1 receives the signal from pressure sensor 14 and immediately controls the opening of valve I8 on the secondary automatic light 6 and fuel gas pipeline 15, allowing natural gas to flow at a rate of 15m³ / min. 3 / h of flow enters the secondary continuous light 6; Simultaneously trigger the corresponding high-energy ignition gun I17 action, and complete ignition within 1 second; The flame detector 20 detects the flame signal of the secondary lamp 6 and uploads the "ignition successful" signal to the DCS1. The DCS1 records the status and maintains the operation of the secondary lamp 6. Secondary venting channel 3 is activated, working together with primary venting channel 2 to process 320m³ of wastewater. 3 / h exhaust gas (total treatment capacity 400m³) 3 / h, matching emissions).

[0052] 3. Level 3 emergency light triggers 7 times (for high exhaust emissions). When the device malfunctions, the exhaust emissions increase to 580m³. 3 At / h, the pressure in intake buffer tank 13 rises to 0.05MPa (reaching the level 3 trigger threshold): DCS1 activates the switch valve II9 on fuel gas pipeline 15, which is the third-level continuous light 7, allowing natural gas to flow at a rate of 20m³ / h. 3 / h flow enters the level 3 continuous light 7, and at the same time triggers the corresponding high-energy ignition gun II 18 to complete the ignition; After the flame detector Ⅲ22 detects the level 3 flame signal, it sends a "successful ignition" message to DCS1, and the level 3 venting channel 4 is opened; The third-stage venting channel 4 works in conjunction with the first-stage venting channel 2 and the second-stage venting channel 3, achieving a total exhaust gas treatment capacity of 1000m³. 3 / h, fully covering 580m 3 The emissions are per hour, and the total fuel gas consumption for each stage of the continuous lighting is 45m³. 3 / h, no waste.

[0053] 4. Troubleshooting (ignition failure scenario).

[0054] If the flame detector Ⅲ22 does not detect a flame within 5 seconds after the level 3 continuous lamp is ignited: The flame detector III22 sends an "ignition failure" signal to DCS1; DCS1 automatically re-triggers high-energy ignition gun III 19 (second ignition); If no flame is detected the second time, DCS1 will issue an audible and visual alarm for "ignition failure" and simultaneously close the switch valve IV11 on the fuel gas pipe where the third-level continuous light 7 is located (to prevent fuel gas leakage). It will also keep the first-level venting channel 2 and the second-level venting channel 3 running (to temporarily handle exhaust gas) and wait for manual troubleshooting (such as carbon buildup on the ignition gun electrodes, insufficient fuel gas pressure, etc.).

[0055] The fuel-saving automatic ignition control system and method described in this embodiment, compared to the traditional scheme (total combustion capacity 45m³), offers advantages over traditional methods. 3 (continuous consumption / h), in this embodiment, only 10m is consumed at low flow rates. 3 / h, consuming 25m at medium flow rates 3 / h, consuming 45m at high flow rates 3 The system reduces average fuel gas consumption by approximately 60% per hour, resulting in annual natural gas cost savings exceeding 1.5 million yuan. Simultaneously, through a closed-loop control system of "pressure interlock-ignition-flame confirmation," there is no direct emission of exhaust gas due to ignition failure. Flammable and explosive gases such as silanes are converted into harmless SiO2 and H2O after combustion, meeting environmental and safety standards. This fuel-saving automatic ignition control system and method can cover an area of ​​80-600 meters. 3 The system can handle exhaust gas emission fluctuations of / h without requiring manual channel switching or adjustment of the automatic lights, resulting in a high degree of automation and reduced human error.

[0056] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. An automatic ignition control system for accidental exhaust gas in polysilicon production, characterized in that, include: DCS, emergency exhaust gas venting unit, emergency light unit, fuel gas supply unit and ignition unit; The accident exhaust gas venting unit includes an exhaust gas emission main pipe and a buffer tank. The buffer tank is connected to at least two venting channels. The pipe diameter of each venting channel increases in the direction of increasing exhaust gas treatment capacity. Instrument control valves are installed on the second and higher venting channels, and pressure sensors are installed on the buffer tank. The continuous light unit includes a continuous light corresponding to each venting channel, and the continuous light is used to ignite the exhaust gas discharged from the corresponding venting channel in case of an accident. The fuel gas supply unit provides fuel gas for the continuous lights. Instrument control valves are installed on the pipes connecting each continuous light to the fuel gas supply unit. A flow sensor is installed on the main gas supply pipe of the fuel gas supply unit. The ignition unit includes a high-energy ignition gun for igniting the continuous lamp, with each high-energy ignition gun corresponding to a continuous lamp. The DCS is connected to the pressure sensor, flow sensor, high-energy ignition gun, and instrument control valves on each pipeline.

2. The automatic ignition control system according to claim 1, characterized in that: It also includes a flame detection unit, which includes a flame detection device corresponding to each level of the continuous lamp, and the flame detection device is used to detect the flame status of the corresponding continuous lamp.

3. The automatic ignition control system according to claim 2, characterized in that: The flame detection device is an ultraviolet flame detection device or a sheathed thermocouple.

4. The automatic ignition control system according to claim 1, characterized in that: The buffer tank is connected to 2 to 5 venting channels.

5. The automatic ignition control system according to claim 4, characterized in that: The buffer tank is connected to three venting channels, each for treating 100m³ of exhaust gas. 3 A primary venting channel with a capacity of / h and a 300m³ exhaust gas treatment capacity. 3 / h secondary venting channel and 600m³ exhaust gas treatment 3 / h three-level venting channel.

6. The automatic ignition control system according to claim 1, characterized in that: The instrument control valve is one of the following: solenoid valve, pneumatic valve, or on / off valve.

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