A combustion system for oil field heating furnace

Abstract

The present invention discloses a combustion system for an oilfield heating furnace, comprising a burner, a fire extinguishing device and a control device. The burner comprises a body, the body comprises a burner shell, the fire extinguishing device comprises a gas fire extinguishing medium generator, a main pipeline for conveying the gas fire extinguishing medium, a fire tube fire extinguishing unit and a control circuit, the fire tube fire extinguishing unit comprises a branch pipeline and an electric control valve, the inlet of the main pipeline is connected to the gas fire extinguishing medium outlet of the gas fire extinguishing medium generator, the inlet of the branch pipeline is connected to the main pipeline; the electric control valve is connected in series in the branch pipeline, the outlet of the branch pipeline is connected to the burner shell; the control circuit comprises a controller, the control end of the electric control valve is connected to the control signal output end of the controller. Once the present invention finds that the fire tube of the oilfield heating furnace is leaking, the control circuit can start the gas fire extinguishing medium generator, convey the gas fire extinguishing medium from the burner shell to the fire tube through the main pipeline and the branch pipeline, and can quickly extinguish the fire caused by the leakage in the fire tube.

Description

[Technical field]

[0001] The invention relates to an oilfield heating furnace, in particular to a combustion system of the oilfield heating furnace. [Background Technology]

[0002] The oilfield heating furnace, also known as the fire tube furnace, is a widely used heating equipment in oilfields. It is used to heat the multiphase mixed liquid in oilfield production. The multiphase mixed liquid includes crude oil, water and other impurities. The oilfield heating furnace includes a furnace body and a fire tube, among which the fire tube is the main heating device of the heating furnace, including a fire tube and a smoke tube. The combustion system of the oilfield heating furnace includes a burner and a control system. The burner is installed on the outside of the furnace body, located at one end of the fire tube. The fuel is ignited in the burner at one end of the fire tube and sprayed into the fire tube for combustion. The multiphase mixed liquid outside the fire tube and the outer wall of the fire tube conduct heat convection to achieve oil-water separation. However, if the fire tube is perforated due to fire, the multiphase mixed liquid will flow into the fire tube and cause a fire. At present, there is no fire extinguishing device specifically for the fire of the oilfield heating furnace due to leakage, and it is difficult to extinguish the fire in the fire tube. [Summary of the invention]

[0003] The technical problem to be solved by the present invention is to provide a combustion system for an oil field heating furnace which can quickly extinguish a fire in a fire tube.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is a combustion system of an oilfield heating furnace, including a burner, a fire extinguishing device and a control device, the burner includes a main body, the main body includes a burner shell, the fire extinguishing device includes a gas fire extinguishing medium generator, a main line for conveying the gas fire extinguishing medium, a fire tube fire extinguishing unit and a control circuit, the fire tube fire extinguishing unit includes a branch pipeline and an electric control valve, the inlet of the main pipeline is connected to the gas fire extinguishing medium outlet of the gas fire extinguishing medium generator, and the inlet of the branch pipeline is connected to the main pipeline; the electric control valve is connected in series in the branch pipeline, and the outlet of the branch pipeline is connected to the burner shell; the control circuit includes a controller, and the control end of the electric control valve is connected to the control signal output end of the controller.

[0005] The combustion system of the oilfield heating furnace described above includes the two burners described above, and the fire extinguishing device includes a three-way joint and two fire-tube fire-extinguishing units described above; the inlet of the three-way joint is connected to the main pipeline, and the inlets of the branch pipelines of the two fire-tube fire-extinguishing units are respectively connected to the outlet of a three-way joint; the outlets of the branch pipelines of the two fire-tube fire-extinguishing units are respectively connected to a burner shell; the rear part of the burner shell is equipped with a gas fire-extinguishing medium injection pipe facing the inner cavity of the burner, and the outlet of the branch pipeline 61 is connected to the gas fire-extinguishing medium injection pipe.

[0006] In the combustion system of the oilfield heating furnace described above, a pressure sensor is installed at the main line near the gas extinguishing medium outlet of the gas extinguishing medium generator, and the pressure signal output end of the main line pressure sensor is connected to the first pressure signal input end of the controller.

[0007] The combustion system of the oil field heating furnace described above, the fire extinguishing unit includes a pressure sensor. The pressure sensor of the fire extinguishing unit is installed in the branch pipeline, located between the electric control valve and the outlet of the branch pipeline, and the pressure signal output end of the pressure sensor of the fire extinguishing unit is connected to the second pressure signal input end of the controller.

[0008] The combustion system of the oil field heating furnace described above, the fire tube fire extinguishing unit includes a fire tube leakage detection sensor, the fire tube leakage detection sensor is a immersion type liquid level transmitter, the immersion type liquid level transmitter includes a liquid level transmitter body, a liquid level probe and a pressure pipe connecting the transmitter body and the liquid level probe, the liquid level transmitter body is installed on the outside of the burner shell through a bracket, the pressure pipe is connected to the burner shell fire tube, and the liquid level probe is arranged at the lower part or front of the inner cavity of the burner shell; the signal output end of the liquid level transmitter is connected to the fire tube leakage signal input end of the controller.

[0009] In the combustion system of the oilfield heating furnace described above, the fire tube fire extinguishing unit includes an AI image recognition flame detector, the burner includes a blower, the mounting plate at the front end of the blower is fixed on the rear plate of the burner housing, the mounting plate of the blower includes an observation hole, and the front end of the AI ​​image recognition flame detector is fixed on the mounting plate of the blower. Located behind the observation hole.

[0010] The combustion system of the oilfield heating furnace described above, the control circuit includes a gas fire extinguishing medium generator starting circuit, the gas fire extinguishing medium generator starting circuit includes a relay, a relay drive circuit, a lead electric heat igniter, and a relay normally open contact connected in series between the lead ignition power supply and the lead electric heat igniter; the control end of the relay drive circuit is connected to the ignition control signal output end of the controller, and the relay power supply, relay coil and relay drive circuit are connected in series.

[0011] The combustion system of the oilfield heating furnace described above, the fire extinguishing device includes a fire lead, a fire lead protective tube, a start box and a control box, the lead electric thermal igniter is arranged in the start box, and the controller, relay and relay drive circuit are arranged in the control box; one end of the fire lead protective tube is connected to the start box, and the other end is connected to the fire lead inlet of the gas fire extinguishing medium generator; the first end of the fire lead is located in the start box, close to the fire lead electric thermal igniter, and the other end of the fire lead passes through the fire lead protective tube and enters the gas fire extinguishing medium generator.

[0012] The combustion system of the oilfield heating furnace described above, the fire extinguishing device comprises the following steps when working:

[0013] 901) The controller and the leakage detection sensor of each fire tube fire extinguishing unit monitor the oil leakage of the fire tube of this unit in real time. When the controller receives the oil leakage signal sent by any leakage detection sensor, the controller sends a signal to the control device, and the control device cuts off the power supply and gas supply to the burner of the leaking fire tube;

[0014] 902) After the burner of the leaking oil tube is powered off or the gas is cut off, the control device notifies the controller to detect the flame in the leaking oil tube and start the relevant AI image recognition flame detector to work. If the relevant AI image recognition flame detector can still detect the open flame after the power outage or gas cut off, the controller starts the gas extinguishing medium generator start circuit;

[0015] 903) The gas extinguishing medium generator start circuit ignites the fire fuse, and the burning fire fuse ignites the gas extinguishing medium extinguishing agent in the gas extinguishing medium generator, and the gas extinguishing medium generator generates high pressure to eject the gas extinguishing medium or gas. The high-pressure gas extinguishing medium ejected from the gas extinguishing medium generator is ejected into the oil-leaking fire tube through the main pipeline and branch pipelines and the relevant burners, thereby extinguishing the flame generated by the oil leakage in the oilfield heating furnace fire tube.

[0016] The combustion system of the oilfield heating furnace described above, the electric control valve is normally open, the fire extinguishing unit includes a pressure sensor matched with the burner, the pressure sensor of the fire extinguishing unit is installed on the branch pipeline connecting the corresponding burner and the electric control valve, the pressure signal output end of the pressure sensor of the fire extinguishing unit is connected to the pressure signal input end of the controller, and the fire extinguishing device includes the following steps when working:

[0017] 1001) If after the power outage and gas outage, in step 902, the relevant AI image recognition flame detector can still detect an open flame, the controller first closes the electric control valve that is not related to the fire extinguishing, and the electric control valve corresponding to the leaking fire tube is still in the open state; the closed electric control valve feeds back the valve closed signal to the controller, and after the controller receives the signal that the electric control valve that is not related to the fire extinguishing is closed, it controls the gas fire extinguishing medium generator to start the circuit and ignite the fire fuse;

[0018] 1002) The pressure sensor in the main line senses the pressure of the high-pressure gas fire extinguishing medium, and feeds back to the controller a signal that the gas fire extinguishing medium generator has ignited and outputs the high-pressure gas fire extinguishing medium; if the controller does not receive the pressure signal fed back by the main line pressure sensor after starting the gas fire extinguishing medium generator start circuit, the controller turns on the alarm signal;

[0019] 1003) The pressure sensor in the branch pipeline that transports the gas fire extinguishing medium of the leaking fire tube senses the pressure of the high-pressure gas fire extinguishing medium and feeds back the information that the high-pressure gas fire extinguishing medium has reached the burner to the controller to confirm that the fire extinguishing device is working normally; if the controller does not receive the gas fire extinguishing medium pressure signal from the pressure sensor in the branch pipeline, the controller activates the alarm signal to prevent the fire tube from leaking oil and getting out of control.

[0020] Once the fire tube of the oilfield heating furnace is found to be leaking, the control circuit can start the gas fire extinguishing medium generator, and transport the gas fire extinguishing medium from the burner shell to the fire tube through the main pipeline and the branch pipeline, so as to quickly extinguish the fire caused by the leakage in the fire tube. [Drawings]

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0022] Figure 1 It is a front view of the combustion system of the oil field heating furnace according to an embodiment of the present invention.

[0023] Figure 2 It is a top view of the combustion system of the oil field heating furnace according to an embodiment of the present invention.

[0024] Figure 3 It is a stereoscopic diagram of a combustion system of an oil field heating furnace according to an embodiment of the present invention.

[0025] Figure 4 It is a stereoscopic diagram of a fire gun leakage detection sensor according to an embodiment of the present invention.

[0026] Figure 5 1 is a circuit diagram of a smoke generator starting circuit according to an embodiment of the present invention. [Specific implementation method]

[0027] The structure of the oilfield heating furnace fire extinguishing system according to the embodiment of the present invention is as follows: Figures 1 to 5 As shown, it includes a burner, a burner control device and a fire extinguishing device.

[0028] The burner 40 includes a burner body and a blower 42 . The burner body includes a shell 41 . The blower 42 is fixed to the rear end of the shell 41 .

[0029] The fire extinguishing device includes a smoke generator 10 as a gaseous fire extinguishing medium generator, a control circuit, a main pipe 14 for conveying smoke, a three-way joint 15, and two fire tube fire extinguishing units 60. Oilfield heating furnaces generally have two fire tubes, and a burner 40 is installed at the rear end of each fire tube, so two fire tube fire extinguishing units 60 are required.

[0030] The gaseous fire extinguishing medium generator can also be a trifluoromethane (nitrogen) generator, a carbon dioxide generator, a heptafluoropropane generator or a perfluorohexanone generator. The gaseous fire extinguishing medium generator of this embodiment is described by taking a smoke generator as an example. Each fire tube fire extinguishing unit 60 includes a branch pipeline 61, an electric control valve 62, a flash pressure sensor 63, a leakage detection sensor 50 and an AI image recognition flame detector 70.

[0031] The inlet of the main pipeline 14 is connected to the smoke outlet 13 of the smoke generator 10, the inlet of the three-way joint 15 is connected to the main pipeline 14, and the inlets of the branch pipelines 61 of the two fire-extinguishing units 60 are respectively connected to the outlets of the three-way joints 15. The outlets of the branch pipelines 61 of the two fire-extinguishing units are respectively connected to the housing 41 of the burner. The rear part of the housing 41 of the burner is equipped with a gas smoke fire extinguishing medium injection pipe 411 facing the inner cavity of the burner, and the outlet of the branch pipeline 61 is connected to the gas smoke fire extinguishing medium injection pipe 411.

[0032] The electric control valve 62 and the flash pressure sensor 63 are installed in the branch pipeline 61. The electric control valve 62 is connected in series in the branch pipeline 61, close to the outlet of the three-way joint 15, and the flash pressure sensor 63 is installed between the electric control valve 62 and the outlet of the branch pipeline 61. The outlet of the branch pipeline 61 is connected to the shell 41 of the burner. When extinguishing a fire, the smoke generated by the smoke generator 10 passes through the main pipeline 14, the three-way joint 15, and the outlet of the branch pipeline 61, and enters the fire tube of the oil field heating furnace from the burner shell 41.

[0033] The control circuit includes a microcontroller MCU and a smoke generator start circuit. The valve of the electric control valve 62 is normally open. The control end of the electric control valve 62 is connected to the control signal output end of the microcontroller MCU. The valve opening and closing signal output end of the electric control valve 62 is connected to the valve opening and closing signal input end of the electric control valve of the microcontroller MCU. The pressure signal output end of the flash pressure sensor 63 is connected to the second pressure signal input end of the microcontroller MCU, and the signal output end of the leakage detection sensor 50 is connected to the leakage detection signal input end of the microcontroller MCU.

[0034] like Figure 1 As shown, a flash pressure sensor 16 is installed on the riser of the main pipe 14 near the smoke outlet 13 of the smoke generator 10. The pressure signal output terminal of the flash pressure sensor 16 on the main pipe 14 is connected to the first pressure signal input terminal of the microcontroller MCU.

[0035] The flash pressure sensor 16 in the main pipeline 14 and the flash pressure sensor 63 in the branch pipeline 61 can be installed simultaneously or selectively.

[0036] The flash pressure sensor 63 of this embodiment includes a voltage-variable bridge, a signal amplifying circuit and an analog-to-digital converter. The output end of the voltage-variable bridge is connected to the input end of the signal amplifying circuit, and the output end of the signal amplifying circuit is connected to the pressure signal input end of the microcontroller MCU through the analog-to-digital converter.

[0037] like Figure 4 As shown, in this embodiment, the leakage detection sensor 50 is a submersible liquid level transmitter, which includes a liquid level transmitter body 51, a liquid level probe 52, and a pressure pipe 53 connecting the transmitter body 51 and the liquid level probe 52. The liquid level transmitter body 51 is installed on the outside of the burner shell 41 through a bracket 54, and the pressure pipe 53 passes through the burner shell 41 and enters the fire tube. The liquid level probe 52 is arranged in the lower part of the heating furnace fire tube, which can be in the inner cavity of the burner shell 41 or in front of the inner cavity of the burner shell 41. The signal output end of the liquid level transmitter is connected to the control signal input end of the microcontroller MCU.

[0038] The AI ​​image recognition flame detector 70 is installed on the blower 42 of the burner. The mounting plate 421 at the front end of the blower is fixed on the rear plate of the burner housing 41. The mounting plate 421 of the blower 42 has an observation hole (not shown in the figure). The front end of the AI ​​image recognition flame detector 70 is fixed on the mounting plate 421 of the blower 42. It is located behind the observation hole. The lens of the AI ​​image recognition flame detector 70 obtains the flame image inside the fire tube through the observation hole, and the signal output end of the AI ​​image recognition flame detector 70 is connected to the flame recognition signal input end of the microcontroller MCU.

[0039] The control circuit also includes a smoke generator starting circuit, such as Figure 5 As shown, the smoke generator starting circuit includes a relay K, a relay driving circuit, an electric heat igniter of a fire-fighting lead, and a relay normally open contact K1 connected in series between the ignition power supply of the fire-fighting lead and the electric heat igniter of the fire-fighting lead. The control end of the relay driving circuit is connected to the ignition control signal output end of the controller as the control end of the smoke generator starting circuit, and the relay power supply, the relay coil and the relay driving circuit are connected in series.

[0040] like Figure 5 As shown, in this embodiment, the electric heating igniter is a spiral heating wire, the fire fuse ignition power supply is AC 220V mains electricity, and the fire fuse passes through the inner hole of the spiral heating wire. The relay drive circuit uses transistor Q1, the ignition control signal output end of the microcontroller MCU is connected to the base of the transistor Q1 through the resistor R1, and the DC_5V relay power supply and the coil of the relay K are connected in series with the transistor Q1.

[0041] The electric heat igniter of the fire-fighting lead is arranged in the starter box 30, and the microcontroller MCU, the relay and the relay driving circuit are arranged in the control box (not shown in the figure). One end of the fire-fighting lead protection tube 11 is connected to the starter box 30, and the other end is connected to the fire-fighting lead inlet 12 of the smoke generator 10.

[0042] One end of the fire-fighting lead is fixed in the starter box 30 and passes through the spiral heating wire of the fire-fighting lead electric heating igniter. The other end of the fire-fighting lead passes through the fire-fighting lead protective tube 11 and enters the smoke generator 10.

[0043] When the fire extinguishing device of the oilfield heating furnace in the above embodiment of the present invention is working, it includes the following steps:

[0044] 1) The microcontroller and leakage detection sensor of each fire tube fire extinguishing unit monitors the oil leakage of the fire tube of this unit in real time. When the microcontroller receives the oil leakage signal sent by any leakage detection sensor, the microcontroller sends a signal to the control device, and the control device cuts off the power supply and gas supply to the burner of the leaking fire tube;

[0045] 2) After the burner of the leaking oil tube is powered off and the gas is cut off, the control device notifies the microcontroller to detect the flame in the leaking oil tube and start the relevant AI image recognition flame detector to work;

[0046] 3) If the relevant AI image recognition flame detector can still detect open flames after power outages and gas outages, the microcontroller will first close the electronically controlled valves that are not related to the fire extinguishing, leaving the electronically controlled valve corresponding to the leaking fire tube open;

[0047] 4) The closed electric control valve feeds back the valve closed signal to the microcontroller. After receiving the closed signal of the electric control valve which is not related to the fire extinguishing, the microcontroller controls the smoke generator to start the circuit and ignite the fire fuse;

[0048] 5) The smoke generator start circuit ignites the fire fuse, and the burning fire fuse ignites the smoke extinguishing agent in the smoke generator, generating high pressure in the smoke generator to eject smoke or gas. The high-pressure smoke ejected from the smoke generator is ejected into the oil-leaking fire tube through the main pipeline and branch pipelines and the relevant burners, extinguishing the flames generated by the oil field heating furnace fire tube due to oil leakage.

[0049] 6) The pressure sensor in the main pipe senses the pressure of the high-pressure smoke and feeds back to the microcontroller a signal that the smoke generator has been ignited and outputs high-pressure smoke; if the microcontroller does not receive the pressure signal fed back by the main pipe pressure sensor after starting the smoke generator start-up circuit, the microcontroller turns on the alarm signal;

[0050] 7) The pressure sensor in the branch pipeline that transports smoke from the leaking fire tube senses the pressure of the high-pressure smoke and feeds back the information that the high-pressure smoke has reached the burner to the microcontroller to confirm that the fire extinguishing device is working properly; if the microcontroller does not receive the smoke pressure signal from the pressure sensor in the branch pipeline, the microcontroller activates the alarm signal to prevent the fire tube from leaking oil from getting out of control.

Claims

1. A combustion system for an oilfield heating furnace, comprising a burner and a control device, wherein the burner comprises a body, and the body comprises a burner shell, characterized in that: It includes a fire extinguishing device, which includes a gas fire extinguishing medium generator, a main pipeline for conveying the gas fire extinguishing medium, a fire extinguishing unit and a control circuit. The fire extinguishing unit includes a branch pipeline and an electric control valve. The inlet of the main pipeline is connected to the gas fire extinguishing medium outlet of the gas fire extinguishing medium generator, and the inlet of the branch pipeline is connected to the main pipeline; the electric control valve is connected in series in the branch pipeline, and the outlet of the branch pipeline is connected to the burner shell; the control circuit includes a controller, and the control end of the electric control valve is connected to the control signal output end of the controller; the main pipeline is equipped with a pressure sensor at the gas fire extinguishing medium outlet near the gas fire extinguishing medium generator, and the pressure signal output end of the main pipeline pressure sensor is connected to the first pressure signal input end of the controller; the fire extinguishing unit includes a pressure sensor, and the pressure sensor of the fire extinguishing unit is installed in the branch pipeline, located between the electric control valve and the outlet of the branch pipeline, and the pressure signal output end of the pressure sensor of the fire extinguishing unit is connected to the second pressure signal input end of the controller; the fire extinguishing unit includes an AI image recognition flame detector, and the burner includes a blower, and a mounting plate at the front end of the blower It is fixed on the rear plate of the burner housing, the mounting plate of the blower includes an observation hole, and the front end of the AI ​​image recognition flame detector is fixed on the mounting plate of the blower and is located behind the observation hole; the control circuit includes a gas fire extinguishing medium generator starting circuit, and the gas fire extinguishing medium generator starting circuit includes a relay, a relay drive circuit, a lead electric thermal igniter, and a relay normally open contact connected in series between the lead ignition power supply and the lead electric thermal igniter; the control end of the relay drive circuit is connected to the ignition control signal output end of the controller, and the relay power supply, the relay coil and the relay drive circuit are connected in series; the fire extinguishing device includes a fire lead, a fire lead protective tube, a starter box and a control box, the lead electric thermal igniter is arranged in the starter box, and the controller, the relay and the relay drive circuit are arranged in the control box; one end of the fire lead protective tube is connected to the starter box, and the other end is connected to the fire lead inlet of the gas fire extinguishing medium generator; the first end of the fire lead is located in the starter box, close to the fire lead electric thermal igniter, and the other end of the fire lead passes through the fire lead protective tube and enters the gas fire extinguishing medium generator.

2. The combustion system of the oilfield heating furnace according to claim 1, characterized in that: It comprises two of the burners, and the fire extinguishing device comprises a three-way joint and two of the fire-tube fire-extinguishing units; the inlet of the three-way joint is connected to the main pipeline, and the inlets of the branch pipelines of the two fire-tube fire-extinguishing units are respectively connected to the outlet of a three-way joint; the outlets of the branch pipelines of the two fire-tube fire-extinguishing units are respectively connected to a burner shell; the rear part of the burner shell is equipped with a gas fire-extinguishing medium injection pipe facing the inner cavity of the burner, and the outlet of the branch pipeline is connected to the gas fire-extinguishing medium injection pipe.

3. The combustion system of the oilfield heating furnace according to claim 1, characterized in that: The fire tube fire extinguishing unit includes a fire tube leakage detection sensor, which is a immersion type liquid level transmitter. The immersion type liquid level transmitter includes a liquid level transmitter body, a liquid level probe and a pressure pipe connecting the transmitter body and the liquid level probe. The liquid level transmitter body is installed on the outside of the burner shell through a bracket, the pressure pipe passes through the burner shell and enters the fire tube, and the liquid level probe is arranged at the lower part or front of the inner cavity of the burner shell; the signal output end of the liquid level transmitter is connected to the fire tube leakage signal input end of the controller.

4. The combustion system of the oilfield heating furnace according to claim 1, characterized in that: The fire extinguishing device works by: 401) The controller and leakage detection sensor of each fire tube fire extinguishing unit monitor the oil leakage of the fire tube of this unit in real time. When the controller receives the oil leakage signal from any leakage detection sensor, the controller sends a signal to the control device, and the control device cuts off the power supply and gas supply to the burner of the leaking fire tube; 402) After the burner of the leaking oil tube is powered off or the gas is cut off, the control device notifies the controller to detect the flame in the leaking oil tube and start the relevant AI image recognition flame detector to work. If the relevant AI image recognition flame detector can still detect the open flame after the power outage or gas cut off, the controller starts the gas extinguishing medium generator start circuit; 403) The starting circuit of the gas fire extinguishing medium generator ignites the fire fuse, and the burning fire fuse ignites the gas fire extinguishing medium in the gas fire extinguishing medium generator. High pressure is generated in the gas fire extinguishing medium generator, causing the gas fire extinguishing medium or gas to spray out. The high-pressure gas fire extinguishing medium sprayed from the gas fire extinguishing medium generator is sprayed into the leaking fire tube through the main pipeline and branch pipelines and the relevant burners, thereby extinguishing the flame caused by the oil leakage in the fire tube of the oil field heating furnace.

5. The combustion system of the oilfield heating furnace according to claim 4, characterized in that: The electric control valve is normally open, the fire extinguishing unit includes a pressure sensor matched with the burner, the pressure sensor of the fire extinguishing unit is installed on the branch pipeline connecting the corresponding burner and the electric control valve, the pressure signal output end of the pressure sensor of the fire extinguishing unit is connected to the pressure signal input end of the controller, and the fire extinguishing device includes the following steps when working: 501) If after the power outage and gas outage, in step 402, the relevant AI image recognition flame detector can still detect an open flame, the controller first closes the electric control valve that is not related to the fire extinguishing, and the electric control valve corresponding to the leaking fire tube is still in the open state; the closed electric control valve feeds back the valve closed signal to the controller, and after receiving the signal that the electric control valve that is not related to the fire extinguishing is closed, the controller controls the gas fire extinguishing medium generator to start the circuit and ignite the fire fuse; 502) The pressure sensor in the main line senses the pressure of the high-pressure gas fire extinguishing medium and feeds back to the controller a signal that the gas fire extinguishing medium generator has ignited and outputs the high-pressure gas fire extinguishing medium; if the controller does not receive the pressure signal fed back by the main line pressure sensor after starting the gas fire extinguishing medium generator start circuit, the controller turns on the alarm signal; 503) The pressure sensor in the branch pipeline that transports the gas fire extinguishing medium of the leaking fire tube senses the pressure of the high-pressure gas fire extinguishing medium and feeds back the information that the high-pressure gas fire extinguishing medium has reached the burner to the controller to confirm that the fire extinguishing device is working normally; if the controller does not receive the gas fire extinguishing medium pressure signal from the pressure sensor in the branch pipeline, the controller activates the alarm signal to prevent the fire tube from leaking oil and getting out of control.

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