A combustion system for an oilfield heating furnace

Abstract

The present invention discloses a combustion system for an oilfield heating furnace, which includes a burner, a fire extinguishing device and a control device. The burner includes a body, and the body includes a burner housing. The fire extinguishing device includes a foam fire extinguishing device, a main pipeline for conveying a foam 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 foam fire extinguishing medium outlet of the foam fire extinguishing device, 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 housing. The control circuit includes a controller, and the control ends of the foam fire extinguishing device and the electric control valve are respectively connected to the control signal output end of the controller. Once it is found that the fire tube of the oilfield heating furnace leaks liquid, the control circuit of the present invention can start the gas foam fire extinguishing device, and convey the foam fire extinguishing medium from the burner housing into the fire tube through the main pipeline and the branch pipeline, so as to quickly extinguish the fire caused by the liquid 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] Oilfield heating furnaces, also known as fire tube furnaces, are widely used in oilfields to heat the multiphase mixture used in oilfield production, which includes crude oil, water, and other impurities. Oilfield heating furnaces consist of a furnace body and a fire tube. The fire tube is the furnace's primary heating device and includes a fire tube and a flue pipe. The combustion system of an oilfield heating furnace includes a burner and a control system. The burner is mounted outside the furnace body, at one end of the fire tube. Fuel is ignited in the burner at one end of the fire tube and sprayed into the fire tube for combustion. The multiphase mixture outside the fire tube exchanges heat with the outer wall of the fire tube, achieving oil-water separation. However, if the fire tube is perforated by fire, the multiphase mixture can flow into the fire tube, causing a fire. Currently, there is no fire extinguishing device specifically designed to extinguish fires caused by fluid leakage in oilfield heating furnace fire tubes, making fire extinguishing in these areas difficult. [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 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 for an oilfield heating furnace, including a burner, a fire extinguishing device and a control device, the burner including a main body, the main body including a burner shell, the fire extinguishing device including a foam fire extinguishing device, a main line for conveying foam fire extinguishing medium, a fire tube fire extinguishing unit and a control circuit, the fire tube fire extinguishing unit including a branch pipeline and an electric control valve, the inlet of the main line is connected to the foam fire extinguishing medium outlet of the foam fire extinguishing device, and the inlet of the branch pipeline is connected to the main line; 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 foam fire extinguishing device and the control end of the electric control valve are respectively 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 tee joint and two fire tube fire extinguishing units described above; the inlet of the tee 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 tee 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 at least one foam fire extinguishing medium injection pipe facing the inner cavity of the burner, and the outlet of the branch pipeline is connected to the foam fire extinguishing medium injection pipe.

[0006] For the combustion system of the oilfield heating furnace described above, the foam fire extinguishing medium injection pipe includes a spray pipe, a mounting flange, and a pipe joint. The burner housing has a rear part including a spray pipe hole corresponding to the foam fire extinguishing medium injection pipe. The spray pipe passes through the spray pipe hole and enters the interior of the burner. The mounting flange of the foam fire extinguishing medium injection pipe is fixed on the housing of the burner, and the pipe joint of the foam fire extinguishing medium injection pipe is connected to the outlet of the branch pipeline through a connecting pipe.

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

[0008] For the combustion system of the oilfield heating furnace described above, the fire tube fire extinguishing unit includes a fire tube liquid leakage detection sensor and an AI image recognition flame detector.

[0009] For the combustion system of the oilfield heating furnace described above, the fire tube liquid leakage detection sensor is a submersible level transmitter. The submersible level transmitter includes a level transmitter body, a level probe, and a pressure guiding pipe connecting the transmitter body and the level probe. The level transmitter body is installed outside the burner housing through a bracket. The pressure guiding pipe penetrates the burner housing and the fire tube. The level probe is arranged at the lower part or the front of the inner cavity of the burner housing. The signal output end of the level transmitter is connected to the fire tube liquid leakage signal input end of the controller.

[0010] For the combustion system of the oilfield heating furnace described above, the burner includes a blower. The installation adapter plate at the front end of the blower is fixed on the rear plate of the burner housing. The installation adapter plate of the blower includes an observation hole. The front part of the AI image recognition flame detector is fixed on the installation adapter plate of the blower, behind the observation hole. The lens of the AI image recognition flame detector passes through the observation hole and enters the burner.

[0011] For the combustion system of the oilfield heating furnace described above, the fire extinguishing device includes a water inlet pipe, an electric valve, and a booster pump. The foam fire extinguishing device includes a negative pressure type proportioning mixer. The electric valve and the booster pump are connected in series between the water inlet pipe and the inlet of the negative pressure type proportioning mixer. The outlet of the negative pressure type proportioning mixer serves as the foam fire extinguishing medium outlet of the foam fire extinguishing device and is connected to the main pipeline described above. The control end of the electric valve and the control end of the booster pump are respectively connected to the control signal output end of the controller.

[0012] When the fire extinguishing device of the combustion system of the oilfield heating furnace described above works, it includes the following steps:

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

[0014] 902) After the power supply and gas supply of the burner of the leaking fire tube are cut off, the control device notifies the controller to detect the flame inside the leaking fire tube. The controller starts the relevant AI image recognition flame detector to work. If the relevant AI image recognition flame detector can still detect an open fire after the power supply and gas supply are cut off, the AI image video flame recognizer of the leaking fire tube returns a signal of detecting a flame to the controller.

[0015] 903) The controller opens the electric valve and starts the booster water pump. The pressurized water enters the negative pressure type proportioning mixer, triggering the generation of high-pressure foam inside the foam fire extinguishing device body. The high-pressure foam is mixed with the high-pressure water flow, and the high-pressure foam fire extinguishing medium is ejected from the outlet of the negative pressure type proportioning mixer; the fire extinguishing medium is sprayed into the leaking fire tube through the main pipeline and branch pipelines via the relevant burner to extinguish the flame generated by the oil leakage in the fire tube of the oilfield heating furnace.

[0016] The combustion system of the above-mentioned oilfield heating furnace includes a water inlet pressure sensor and an alarm circuit. The water inlet pressure sensor is installed on the water inlet pipeline, and the output end of the water inlet pressure sensor is connected to the water inlet pressure signal input end of the controller; the electric control valve is normally open. The fire tube fire extinguishing unit includes a pressure sensor matching the burner. The pressure sensor of the fire tube 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 tube fire extinguishing unit is connected to the pressure signal input end of the controller. When the fire extinguishing device works, it includes the following steps:

[0017] 1001) The controller monitors the water pressure of the water inlet pipeline in real time. When the water pressure of the water inlet pipeline is lower than the set value, the controller alarms through the alarm circuit.

[0018] 1002) If the relevant AI image recognition flame detector can still detect an open fire in step 902 after the power supply and gas supply are cut off, the controller first closes the electric control valves irrelevant to this fire extinguishing, and the electric control valve corresponding to the leaking fire tube remains open; the closed electric control valve feeds back the signal that the valve has been closed to the controller. After the controller receives the signal that the electric control valves irrelevant to this fire extinguishing have been closed, it then proceeds to step 903.

[0019] 1003) The pressure sensor in the branch pipeline that conveys the foam fire extinguishing medium of the leaking fire tube senses the pressure of the high-pressure foam fire extinguishing medium, and feeds back the information that the high-pressure foam fire extinguishing medium reaches the burner to the controller to confirm that the fire extinguishing device is working properly; if the controller does not receive the foam fire extinguishing medium pressure signal sent by the pressure sensor in the branch pipeline, the controller issues an alarm signal to prevent the fire caused by the leaking fire tube from getting out of control.

[0020] Once the control circuit detects that the fire tube of the oilfield heating furnace leaks liquid, the gas foam fire extinguishing device can be started, and the foam fire extinguishing medium is conveyed from the burner housing into the fire tube through the main pipeline and the branch pipeline, and the fire caused by the liquid leakage in the fire tube can be quickly extinguished. [Description of Drawings]

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

[0022] Figure 1 is the front view of the combustion system of the oilfield heating furnace according to the embodiment of the present invention.

[0023] Figure 2 is the top view of the combustion system of the oilfield heating furnace according to the embodiment of the present invention.

[0024] Figure 3 is the perspective view of the fire tube fire extinguishing unit according to the embodiment of the present invention.

[0025] Figure 4 is the perspective view of the foam fire extinguishing medium injection pipe according to the embodiment of the present invention.

[0026] Figure 5 is the perspective view of the fire tube liquid leakage detection sensor according to the embodiment of the present invention. [Specific Embodiments]

[0027] The structure of the oilfield heating furnace fire extinguishing system according to the embodiment of the present invention is as Figures 1 to 5 shown, and it includes two burners 40, the control device of the oilfield heating furnace, and the fire extinguishing device.

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

[0029] The fire extinguishing device includes a water inlet pipe 16, an electric valve 17, a booster pump 18, a foam fire extinguishing device 10, a main pipeline 14 for conveying the foam fire extinguishing medium, a tee joint 15, two fire tube fire extinguishing units 60, and a control circuit.

[0030] The oilfield heating furnace 100 has two fire tubes (not shown in the figure), and a burner 40 is installed at the rear end of each fire tube, so two fire tube fire extinguishing units 60 need to be equipped. The burner 40 is located in the firing room 200 of the oilfield heating furnace.

[0031] Each fire tube extinguishing unit 60 includes a branch pipeline 61, an electric control valve 62, a flash pressure sensor 63, two foam fire extinguishing medium injection pipes 12, a liquid leakage detection sensor 50, and an AI image recognition flame detector 70.

[0032] A negative pressure type proportioner 10B is installed on the foam fire extinguishing device 10, and the negative pressure type proportioner 10B is connected to the main body 10A of the foam fire extinguishing device through a pipeline 10C. The foam fire extinguishing device 10 in the embodiment of the present invention adopts the PY series foam fire extinguishing device produced by Jinan Global Industrial Fire Fighting Equipment Co., Ltd.

[0033] The electric valve 17 and the booster pump 18 are connected in series between the pressure inlet pipeline 16 and the inlet of the negative pressure type proportioner 10B. The outlet of the negative pressure type proportioner 10B serves as the foam fire extinguishing medium outlet of the foam fire extinguishing device and is connected to the inlet of the main pipeline 14. An inlet pressure sensor 161 is installed on the pressure inlet pipeline 16. The control ends of the electric valve 17 and the booster pump 18 are respectively connected to the control signal output end of the controller, and the water pressure signal output end of the inlet pressure sensor 161 is connected to the inlet pressure signal input end of the controller.

[0034] The inlet of the tee joint 15 is connected to the outlet of the main pipeline 14, and the inlets of the branch pipelines 61 of the two fire tube extinguishing units 60 are respectively connected to one outlet of the tee joint 15. The outlets of the branch pipelines 61 of the two fire tube extinguishing units are respectively connected to the housing 41 of a burner through a foam fire extinguishing medium injection pipe 12.

[0035] Two foam fire extinguishing medium injection pipes 12 facing the inner cavity of the burner are installed at the rear of each burner housing 41, and the outlet of the branch pipeline 61 is connected to the foam fire extinguishing medium injection pipe 12 through a connecting hose 13.

[0036] The foam fire extinguishing medium injection pipe 12 includes a nozzle 121, a mounting flange 122, and a pipe joint 123. There are two nozzle holes corresponding to the foam fire extinguishing medium injection pipe 12 at the rear of the burner housing 41, and the nozzle 121 passes through the nozzle hole and enters the inside of the burner housing 41. The mounting flange 122 of the foam fire extinguishing medium injection pipe 12 is fixed on the housing 41 of the burner, and the pipe joint 123 of the foam fire extinguishing medium injection pipe 12 is connected to the outlet of the branch pipeline 61 through a connecting hose 13.

[0037] 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 tee joint 15. The flash pressure sensor 63 is installed between the electric control valve 62 and the connecting hose 13. During fire extinguishing, the high-pressure foam fire extinguishing medium generated by the foam fire extinguishing device 10 passes through the main pipeline 14, the tee joint 15, and the connecting hose 13, and is sprayed into the fire tube of the oilfield heating furnace from the foam fire extinguishing medium injection pipe 12 installed on the burner housing 41.

[0038] The control circuit includes a controller and an alarm 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 controller, and the valve opening and closing signal output end of the electric control valve 62 is connected to the electric control valve valve opening and closing signal input end of the controller. The pressure signal output end of the flash pressure sensor 63 is connected to the pressure signal input end of the controller, the signal output end of the liquid leakage detection sensor 50 is connected to the liquid leakage detection signal input end of the controller, and the signal output end of the AI image recognition flame detector 70 is connected to the flame recognition signal input end of the controller.

[0039] The flash pressure sensor 63 of this embodiment includes a piezoresistive bridge, a signal amplification circuit, and an analog-to-digital converter. The output end of the piezoresistive bridge is connected to the input end of the signal amplification circuit, and the output end of the signal amplification circuit is connected to the pressure signal input end of the controller through the analog-to-digital converter.

[0040] As Figure 5 shown, in this embodiment, the liquid leakage detection sensor 50 is a submersible level transmitter. The submersible level transmitter includes a level transmitter body 51, a level probe 52, and a pressure guide tube 53 connecting the transmitter body 51 and the level probe 52. The level transmitter body 51 is installed outside the burner housing 41 through a bracket 54. The pressure guide tube 53 passes through the burner housing 41 and enters the fire tube. The level probe 52 is arranged at the lower part inside the heating furnace fire tube, which can be in the inner cavity of the burner housing 41 or pass through the inner cavity of the burner housing 41 and enter the inside of the fire tube. The signal output end of the level transmitter is connected to the liquid leakage detection signal input end of the controller.

[0041] The AI image recognition flame detector 70 is installed on the air blower 42 of the burner. The installation adapter plate 421 at the front end of the air blower is fixed on the rear plate of the burner housing 41. There is an observation hole (not shown in the figure) on the installation adapter plate 421 of the air blower 42. The front end of the AI image recognition flame detector 70 is fixed on the installation adapter plate 421 of the air blower 42, 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. The signal output end of the AI image recognition flame detector 70 is connected to the flame recognition signal input end of the controller.

[0042] When the fire extinguishing system of the oilfield heating furnace in the above embodiments of the present invention works, it includes the following steps:

[0043] 1) The controller monitors the water pressure in the inlet pipeline in real time. When the water pressure in the inlet pipeline is lower than the set value, the controller alarms through the alarm circuit.

[0044] 2) Each liquid leakage detection sensor monitors the oil leakage of the fire tube in this unit in real time. When the controller of the control circuit receives the oil leakage signal sent by any liquid leakage detection sensor, the controller sends a signal to the control device, and the control device cuts off the power supply and stops the gas supply of the burner of the leaking fire tube.

[0045] 3) After the power supply and gas supply of the burner of the leaking fire tube are cut off, the control device notifies the controller to detect the flame inside the leaking fire tube, and the controller starts the relevant AI image recognition flame detector to work.

[0046] 4) If the relevant AI image recognition flame detector can still detect an open flame after the power supply and gas supply are cut off, the controller first closes the electric control valves that have nothing to do with this fire extinguishing, and keeps the electric control valve corresponding to the leaking fire tube in the open state.

[0047] 5) The closed electric control valve feeds back the signal that the valve has been closed to the controller. After the controller receives the signal that the electric control valves that have nothing to do with this fire extinguishing have been closed, the controller opens the electric valve and starts the booster pump. The pressurized water enters the negative pressure type proportioning mixer, triggering the generation of high-pressure foam inside the body of the foam fire extinguishing device. The high-pressure foam is mixed with the high-pressure water flow in the negative pressure type proportioning mixer, and the high-pressure foam fire extinguishing medium is sprayed out from the outlet of the negative pressure type proportioning mixer. The fire extinguishing medium is sprayed into the leaking fire tube through the main pipeline and branch pipelines via the relevant burners to extinguish the flame generated by the oil leakage in the fire tube of the oilfield heating furnace.

[0048] 6) The pressure sensor in the branch pipeline for transporting the foam fire extinguishing medium of the leaking fire tube senses the pressure of the high-pressure foam fire extinguishing medium and feeds back the information that the high-pressure foam fire extinguishing medium has reached the burner to the controller to confirm that the fire extinguishing device is working properly. If the controller does not receive the foam fire extinguishing medium pressure signal sent by the pressure sensor in the branch pipeline, the controller activates the alarm signal to prevent the flame of the oil leakage in the fire tube from getting out of control.

Claims

1. A combustion system for an oilfield heating furnace, comprising a burner and a control device. The burner includes a body, and the body includes a burner housing, characterized in that, Comprising a fire extinguishing device, the fire extinguishing device includes a foam fire extinguishing device, a main pipeline for conveying the foam 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 foam fire extinguishing medium outlet of the foam fire extinguishing device, 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 housing. The control circuit includes a controller, and the control ends of the foam fire extinguishing device and the electric control valve are respectively connected to the control signal output end of the controller. The fire tube fire extinguishing unit includes a fire tube liquid leakage detection sensor, and the fire tube liquid leakage detection sensor is a submersible level transmitter. The submersible level transmitter includes a level transmitter body, a level probe, and a pressure guiding tube connecting the transmitter body and the level probe. The level transmitter body is installed outside the burner housing through a bracket, the pressure guiding tube passes through the burner housing and enters the fire tube, and the level probe is arranged at the lower part of the inner cavity of the burner housing or passes through the inner cavity of the burner housing and enters the inside of the fire tube. The signal output end of the level transmitter is connected to the fire tube liquid leakage signal input end of the controller. It is characterized in that it includes two such burners, and the fire extinguishing device includes a three-way joint and two such 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 outlets of one three-way joint. The outlets of the branch pipelines of the two fire tube fire extinguishing units are respectively connected to a burner housing. At least one foam fire extinguishing medium injection pipe facing the inner cavity of the burner is installed at the rear of the burner housing, and the outlet of the branch pipeline is connected to the foam fire extinguishing medium injection pipe. The fire tube fire extinguishing unit includes a pressure sensor, and the pressure sensor of the fire tube fire extinguishing unit is installed in the branch pipeline, between the electric control valve and the outlet of the branch pipeline. The pressure signal output end of the pressure sensor of the fire tube fire extinguishing unit is connected to the pressure signal input end of the controller. The fire tube fire extinguishing unit includes an AI image recognition flame detector. The burner includes a blower, the front mounting adapter plate of the blower is fixed on the rear plate of the burner housing, the mounting adapter plate of the blower includes an observation hole, and the front part of the AI image recognition flame detector is fixed on the mounting adapter plate of the blower, behind the observation hole. The lens of the AI image recognition flame detector passes through the observation hole and enters the burner.

2. The combustion system of the oilfield heating furnace according to claim 1, characterized in that, The foam fire extinguishing medium injection pipe includes a spray pipe, a mounting flange, and a pipe joint. The rear part of the burner housing includes a spray pipe hole corresponding to the foam fire extinguishing medium injection pipe, and the spray pipe passes through the spray pipe hole and enters the inside of the burner. The mounting flange of the foam fire extinguishing medium injection pipe is fixed on the burner housing, and the pipe joint of the foam fire extinguishing medium injection pipe is connected to the outlet of the branch pipeline through a connecting pipe.

3. The combustion system of the oilfield heating furnace according to claim 1, characterized in that, The fire extinguishing device includes a water inlet pipeline, an electric valve, and a booster pump. The foam fire extinguishing device includes a negative pressure type proportioning mixer. The electric valve and the booster pump are connected in series between the water inlet pipeline and the inlet of the negative pressure type proportioning mixer, and the outlet of the negative pressure type proportioning mixer is used as the foam fire extinguishing medium outlet of the foam fire extinguishing device and is connected to the said main pipeline. The control ends of the electric valve and the booster pump are respectively connected to the control signal output end of the controller.

4. The combustion system of the oilfield heating furnace according to claim 3, characterized in that, When the fire extinguishing device works, it includes the following steps: 401) The liquid leakage detection sensor monitors the oil leakage of the fire tube of this unit in real time. When the controller receives the oil leakage signal sent by any liquid leakage detection sensor, the controller sends a signal to the control device, and the control device cuts off the power supply and stops the gas supply of the burner of the leaking fire tube; 402) After the power supply and gas supply of the burner of the leaking fire tube are cut off, the control device notifies the controller to detect the flame inside the leaking fire tube. The controller starts the relevant AI image recognition flame detector to work. If the relevant AI image recognition flame detector can still detect an open flame after the power supply and gas supply are cut off, the AI image video flame identifier of the leaking fire tube returns a signal of detecting a flame to the controller; 403) The controller opens the electric valve and starts the booster water pump. The pressurized water enters the negative pressure type proportioning mixer, triggering the generation of high-pressure foam inside the foam fire extinguishing device body. The high-pressure foam is mixed with the high-pressure water flow, and the high-pressure foam fire extinguishing medium is ejected from the outlet of the negative pressure type proportioning mixer; the fire extinguishing medium is sprayed into the leaking fire tube through the main pipeline and branch pipelines via the relevant burner to extinguish the flame generated by the oil leakage of the fire tube of the oilfield heating furnace.

5. The combustion system of the oilfield heating furnace according to claim 4, characterized in that, It includes a water inlet pressure sensor and an alarm circuit. The water inlet pressure sensor is installed on the water inlet pipeline, and the output end of the water inlet pressure sensor is connected to the water inlet pressure signal input end of the controller; the electric control valve is normally open. The fire tube fire extinguishing unit includes a pressure sensor matching the burner. The pressure sensor of the fire tube 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 tube fire extinguishing unit is connected to the pressure signal input end of the controller. When the fire extinguishing device works, it includes the following steps: 501) The controller monitors the water pressure of the water inlet pipeline in real time. When the water pressure of the water inlet pipeline is lower than the set value, the controller alarms through the alarm circuit; 502) If in step 401 after the power supply and gas supply are cut off, and in step 402, the relevant AI image recognition flame detector can still detect an open flame, the controller first closes the electric control valves that have nothing to do with this fire extinguishing. The electric control valve corresponding to the leaking fire tube remains open; the closed electric control valve feeds back the signal that the valve has been closed to the controller. After the controller receives the signal that the electric control valves that have nothing to do with this fire extinguishing have been closed, it then proceeds to step 403; 503) The pressure sensor in the branch pipeline for transporting the foam fire extinguishing medium of the leaking fire tube senses the pressure of the high-pressure foam fire extinguishing medium and feeds back the information that the high-pressure foam fire extinguishing medium has reached the burner to the controller to confirm that the fire extinguishing device is working properly; if the controller does not receive the foam fire extinguishing medium pressure signal sent by the pressure sensor in the branch pipeline, the controller issues an alarm signal to prevent the flame of the fire tube oil leakage from getting out of control.

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