A fire extinguishing device for an oilfield heating furnace

Abstract

The present invention discloses a fire extinguishing device for an oilfield heating furnace, which includes a gas fire extinguishing medium generator serving as a fire extinguisher, a control circuit, a main pipeline for conveying the gas fire extinguishing medium, and a fire tube fire extinguishing unit. 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 fire tube of the oilfield heating furnace; 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. Once it is found that the fire tube of the oilfield heating furnace leaks liquid, the control circuit starts the gas fire extinguishing medium generator, and conveys the gas fire extinguishing medium 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 fire extinguishing device of the oilfield heating furnace. [Background Technology]

[0002] The oilfield heating furnace, referred to as the fire tube furnace, is a heating equipment widely used in oilfields to heat the multiphase mixed liquid in oilfield production, which includes crude oil, water and other impurities. The oilfield heating furnace includes a furnace body and a fire tube, wherein the fire tube is the main heating device of the heating furnace, including a fire tube, a burner and a smoke tube, and the burner is installed on the outside of the furnace body, 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 convects heat with the outer wall of the fire tube 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 fires caused by leakage in the fire tube of oilfield heating furnaces, and it is difficult to extinguish fires in the fire tube. [Summary of the invention]

[0003] The technical problem to be solved by the present invention is to provide a fire extinguishing device 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 fire extinguishing device for an oilfield heating furnace, including a gas fire extinguishing medium generator as a fire extinguisher, a control circuit, a main pipeline for conveying the gas fire extinguishing medium and a fire tube fire extinguishing unit, the oilfield heating furnace includes a fire tube; 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 fire tube of the oilfield heating furnace; 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 fire extinguishing device described above includes a three-way joint and two fire tube fire extinguishing units, and the oil field heating furnace includes two fire tubes; 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 one of the fire tubes.

[0006] In the fire extinguishing device described above, a pressure sensor is installed at the outlet of the gas extinguishing medium near the gas extinguishing medium generator in the main pipeline, and the pressure signal output terminal of the main pipeline pressure sensor is connected to the first pressure signal input terminal 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. The fire extinguishing unit is located between the electric control valve and the outlet of the branch pipeline, and the pressure signal output terminal of the pressure sensor is connected to the second pressure signal input terminal of the controller.

[0007] For the fire extinguishing device described above, the pressure sensor is a flash pressure sensor, which 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.

[0008] For the fire extinguishing device described above, a burner is installed at the rear end of the fire tube. The fire tube fire extinguishing unit includes a fire tube liquid leakage detection sensor and an image / video flame identifier. The liquid level probe of the fire tube liquid leakage detection sensor is installed in the corresponding fire tube, and the signal output end of the fire tube liquid leakage detection sensor is connected to the fire tube liquid leakage signal input end of the controller; the image / video flame identifier is installed on the blower of the burner, and the control end and the monitoring signal output end of the image / video flame identifier are respectively connected to the controller; the electric control valve includes a valve opening / closing signal output end, and the valve opening / closing signal output end of the electric control valve is connected to the electric control valve valve opening / closing signal input end of the controller.

[0009] For the fire extinguishing device described above, the fire tube liquid leakage detection sensor is a submersible level transmitter, which includes a level transmitter body, the liquid level probe, and a pressure guiding tube connecting the transmitter body and the liquid level probe. The level transmitter body is installed outside the fire tube through a bracket, the pressure guiding tube passes through the fire tube, and the liquid level probe is arranged at the lower part inside 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; the outlet of the branch pipeline is connected to the shell of the fire tube burner, and the bracket is installed on the shell of the burner or the heating furnace. The pressure guiding tube passes through the shell of the burner and enters the fire tube or directly enters the fire tube; the body of the image / video flame identifier is installed on the shell of the burner blower or the heating furnace. The shell of the burner blower or the heating furnace includes an observation hole, and the lens of the image / video flame identifier passes through the observation hole and enters the inside of the shell of the burner blower or the heating furnace.

[0010] For the fire extinguishing device described above, the control circuit includes a starting circuit for the gas fire extinguishing medium generator. The starting circuit for the gas fire extinguishing medium generator includes a relay, a relay driving circuit, a lead ignition igniter, and the normally open contact of the relay is connected in series between the lead ignition power supply and the lead ignition igniter; the control end of the relay driving circuit is connected to the ignition control signal output end of the controller, and the relay power supply, the relay coil, and the relay driving circuit are connected in series.

[0011] The fire extinguishing device described above includes a fire-fighting lead wire, a fire-fighting lead wire protection tube, a starting box, and a control box. The lead wire electric igniter is arranged in the starting box, and the controller, relay, and relay drive circuit are arranged in the control box. One end of the fire-fighting lead wire protection tube is connected to the starting box, and the other end is connected to the fire-fighting lead wire inlet of the gas fire extinguishing medium generator. The first end of the fire-fighting lead wire is located in the starting box, near the fire-fighting lead wire electric igniter, and the other end of the fire-fighting lead wire passes through the fire-fighting lead wire protection tube and enters the gas fire extinguishing medium generator. The fire tube fire extinguishing unit is installed in the firing room of the oilfield heating furnace, and the gas fire extinguishing medium fire extinguisher is installed outside the firing room. The fire-fighting lead wire protection tube passes through the wall of the firing room to connect the starting box and the gas fire extinguishing medium fire extinguisher, and the main pipeline passes through the wall of the firing room to connect with the branch pipeline.

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

[0013] 901) The controller and the liquid leakage detection sensor monitor the oil leakage of the fire tube in real time. When the controller receives the oil leakage signal of the oilfield heating furnace fire tube sent by any liquid leakage detection sensor, it immediately notifies the controller in the main control room of the oilfield heating furnace to cut off the power supply and stop the gas supply of the leaking fire tube;

[0014] 902) The controller notifies the image video flame recognizer of the leaking fire tube to detect the flame of the leaking fire tube. If the flame can still be detected in the leaking fire tube after the power supply is cut off and the gas supply is stopped, the image video flame recognizer of the leaking fire tube returns a signal of detecting the flame to the controller;

[0015] 903) After the controller receives the signal of detecting the flame, it closes the electric control valves that have nothing to do with this fire extinguishing, and the electric control valve corresponding to the leaking fire tube remains open;

[0016] 904) The closed electric control valve feeds back the valve closing signal to the controller, and the controller triggers the starting circuit of the gas fire extinguishing medium generator, and high-pressure gas fire extinguishing medium is generated and ejected in the gas fire extinguishing medium generator;

[0017] 905) The gas fire extinguishing medium ejected from the gas fire extinguishing medium generator is input into the leaking fire tube through the conveying pipeline to extinguish the flame generated by the oil leakage of the oilfield heating furnace fire tube.

[0018] For the fire extinguishing device described above, a pressure sensor is installed at the gas fire extinguishing medium outlet of the main pipeline near the gas fire extinguishing medium generator. The pressure signal output terminal of the main pipeline pressure sensor is connected to the first pressure signal input terminal of the controller; 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 terminal of the pressure sensor of the fire tube fire extinguishing unit is connected to the second pressure signal input terminal of the controller; when the fire extinguishing device of the oilfield heating furnace works, it further includes the following steps: after the pressure sensors in the main pipeline for transporting the gas fire extinguishing medium and the branch pipeline corresponding to the leaking liquid fire tube sense the pressure of the high-pressure gas fire extinguishing medium, they respectively feedback to the controller the information that the gas fire extinguishing medium generator ejects high-pressure gas fire extinguishing medium and the high-pressure gas fire extinguishing medium reaches the fire tube, so as to confirm that the fire extinguishing device works normally; if the controller does not receive the corresponding gas fire extinguishing medium pressure signal, an alarm signal will be activated.

[0019] Once the fire extinguishing device of the oilfield heating furnace of the present invention detects liquid leakage in the fire tube of the oilfield heating furnace, the control circuit starts the gas fire extinguishing medium generator, and transports the gas fire extinguishing medium into the fire tube through the main pipeline and the branch pipeline, and can quickly extinguish the fire caused by liquid leakage in the fire tube. [Description of the Drawings]

[0020] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0021] Figure 1 It is a perspective view of the fire extinguishing device of the oilfield heating furnace in the embodiment of the present invention.

[0022] Figure 2 It is a front view of the fire extinguishing device of the oilfield heating furnace in the embodiment of the present invention.

[0023] Figure 3 It is a perspective view of the fire extinguishing device of the oilfield heating furnace in another perspective in the embodiment of the present invention.

[0024] Figure 4 It is a perspective view of the fire extinguishing device of the oilfield heating furnace in yet another perspective in the embodiment of the present invention.

[0025] Figure 5 It is a perspective view of the fire tube liquid leakage detection sensor in the embodiment of the present invention.

[0026] Figure 6 It is a circuit diagram of the gas fire extinguishing medium generator starting circuit in the embodiment of the present invention. [Specific Embodiments]

[0027] The structure of the fire extinguishing device of the oilfield heating furnace in the embodiment of the present invention is as Figures 1 to 6As shown in the figure, it includes a smoke generator 10 as a fire extinguisher, a control circuit, a main pipeline 14 for conveying smoke, a three-way joint 15, and two fire tube extinguishing units 60. The oilfield heating furnace 40 generally has two fire tubes, so two fire tube extinguishing units 60 need to be equipped.

[0028] The gas fire extinguishing medium generator can also adopt a trifluoromethane (nitrogen) generator, a carbon dioxide generator, a heptafluoropropane generator, or a perfluoromethyl isopropyl ketone generator. The gas fire extinguishing medium generator in this embodiment is described by taking the smoke generator as an example.

[0029] Each fire tube extinguishing unit 60 includes a branch pipeline 61, an electric control valve 62, a flash pressure sensor 63, a liquid leakage detection sensor 50, and an image and video flame identifier (not shown in the figure). 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. The inlets of the two fire tube extinguishing units 60 are respectively connected to one outlet of the three-way joint 15. The outlets of the branch pipelines 61 of the two fire tube extinguishing units are respectively connected to one fire tube.

[0030] 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. 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 burner housing 41 at the rear end of the fire tube of the oilfield heating furnace 40. During fire extinguishing, 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 oilfield heating furnace 40 from the burner housing 41 or directly.

[0031] The control circuit includes a microcontroller MCU and a smoke generator starting 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 electric control valve valve opening and closing signal input end 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. The signal output end of the liquid leakage detection sensor 50 is connected to the liquid leakage detection signal input end of the microcontroller MCU.

[0032] As Figure 1 shown in the figure, a flash pressure sensor 16 is installed on the riser pipe of the main pipeline 14 close to the smoke outlet 13 of the smoke generator 10. The pressure signal output end of the flash pressure sensor 16 on the main pipeline 14 is connected to the first pressure signal input end of the microcontroller MCU.

[0033] 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.

[0034] The flash pressure sensor 63 of this embodiment includes a piezoelectric bridge, a signal amplification circuit, and an analog-to-digital converter. The output end of the piezoelectric 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 microcontroller MCU through the analog-to-digital converter.

[0035] 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 guiding tube 53 connecting the transmitter body 51 and the level probe 52. The level transmitter body 51 is installed outside the oilfield heating furnace fire tube or the burner housing 41 through a bracket 54. The pressure guiding tube 53 passes through the burner housing 41 and enters the fire tube or directly enters the fire tube. The level probe 52 is arranged at the lower part inside the heating furnace fire tube. The signal output end of the level transmitter is connected to the control signal input end of the microcontroller MCU.

[0036] The image and video flame recognizer is installed on the fan of the fire tube burner or the heating furnace. The body of the image and video flame recognizer is installed on the housing of the burner fan or the heating furnace. There is an observation hole on the housing of the burner fan or the heating furnace. The lens of the image and video flame recognizer passes through the observation hole and enters the interior of the housing of the burner fan or the heating furnace. The signal output end of the image and video flame recognizer is connected to the flame recognition signal input end of the microcontroller MCU.

[0037] The control circuit includes a smoke generator starting circuit. As Figure 6 shown, the smoke generator starting circuit includes a relay K, a relay driving circuit, an electric igniter for the fire fighting lead. The normally open contact K1 of the relay is connected in series between the ignition power supply of the fire fighting lead and the electric igniter of the fire fighting lead. The control end of the relay driving circuit serves as the control end of the smoke generator starting circuit and is connected to the ignition control signal output end of the controller. The relay power supply, the relay coil, and the relay driving circuit are connected in series.

[0038] As Figure 6 shown, in this embodiment, the electric igniter is a spiral heating wire, and the fire fighting lead ignition power supply is AC 220V mains electricity. The fire fighting lead passes through the inner hole of the spiral heating wire. The relay driving circuit uses a triode Q1. The ignition control signal output end of the microcontroller MCU is connected to the base of the triode Q1 through a resistor R1. The relay power supply of DC_5V, the coil of the relay K, and the triode Q1 are connected in series.

[0039] The electric igniter of the fire fighting lead is arranged in the starting box 30. The microcontroller MCU, the relay, and the relay driving circuit are arranged in the control box 02. One end of the fire fighting lead protection tube 11 is connected to the starting box 30, and the other end is connected to the fire fighting lead inlet 12 of the smoke generator 10.

[0040] One end of the fire lead is fixed in the starting box 30, passes through the spiral heating wire of the ignition device of the fire lead, and the other end of the fire lead passes through the fire lead protection tube 11 and enters the smoke generator 10.

[0041] As Figures 1 to 4 shown, the fire cylinder extinguishing unit 60 is installed in the firing room 20 of the oilfield heating furnace 40, the smoke generator 10 is installed outside the firing room 20, the fire lead protection tube 11 passes through the wall 21 of the firing room 20 to connect the starting box 30 and the smoke generator 10, and the main pipeline 14 enters the firing room 20 and is connected to the branch pipeline 61.

[0042] When the fire extinguishing device of the oilfield heating furnace in the above embodiment of the present invention works, the microcontroller and the liquid leakage detection sensor monitor the oil leakage of the fire cylinder in real time. When the microcontroller receives the oil leakage signal of the oilfield heating furnace fire cylinder sent by the liquid leakage detection sensor, it immediately notifies the controller in the main control room of the oilfield heating furnace to cut off the power supply and stop the gas supply to the leaking fire cylinder.

[0043] The microcontroller notifies the image and video flame recognizer of the leaking fire cylinder to detect the flame inside the leaking fire cylinder. If the flame can still be detected inside the leaking fire cylinder after the power supply and gas supply are cut off, the image and video flame recognizer of the leaking fire cylinder returns a signal of detecting the flame to the microcontroller. After receiving the signal of detecting the flame, the microcontroller closes the electric control valves irrelevant to this fire extinguishing, and only the electric control valve corresponding to the leaking fire cylinder remains open. The closed electric control valve feeds back the valve closing signal to the microcontroller, and the microcontroller ignites the fire lead as the fuse through the spiral heating wire of the lead electric ignition device. The burning fire lead ignites the smoke fire extinguishing agent in the smoke generator, and high pressure is generated in the smoke generator to eject the smoke or gas. The smoke ejected from the smoke generator is input into the leaking fire cylinder through the conveying pipeline, and can quickly extinguish the fire caused by the oil leakage of the oilfield heating furnace fire cylinder. In addition, the flash pressure sensors in the main pipeline and the branch pipeline for conveying the smoke sense the pressure of the high-pressure smoke and respectively feed back the information that the smoke generator ejects high-pressure smoke and the high-pressure smoke reaches the fire cylinder to the microcontroller to confirm that the fire extinguishing device works normally; if the microcontroller does not receive the corresponding smoke pressure signal, it will turn on the alarm signal to prevent the fire caused by the oil leakage of the fire cylinder from getting out of control.

Claims

1. An extinguishing device for an oilfield heating furnace, comprising a fire extinguisher and a control circuit. The oilfield heating furnace includes a fire tube, characterized in that, It includes a main pipeline for transporting a gas fire extinguishing medium and a fire tube fire extinguishing unit. The fire extinguisher is a gas fire extinguishing medium generator. 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. 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 fire tube of the oilfield heating furnace. The control circuit includes a controller. The control end of the electric control valve is connected to the control signal output end of the controller. A burner is installed at the rear end of the fire tube. The fire tube fire extinguishing unit includes a fire tube liquid leakage detection sensor and an image and video flame recognizer. The liquid level probe of the fire tube liquid leakage detection sensor is installed in the corresponding fire tube. The signal output end of the fire tube liquid leakage detection sensor is connected to the fire tube liquid leakage signal input end of the controller. The image and video flame recognizer is installed on the blower of the burner. The control end and the monitoring signal output end of the image and video flame recognizer are respectively connected to the controller. It includes a three-way joint and two such fire tube fire extinguishing units. The oilfield heating furnace includes two such fire tubes. The inlet of the three-way joint is connected to the main pipeline. The inlets of the branch pipelines of the two fire tube fire extinguishing units are respectively connected to one outlet of the three-way joint. The outlets of the branch pipelines of the two fire tube fire extinguishing units are respectively connected to one such fire tube. A pressure sensor is installed at the part of the main pipeline close to the gas fire extinguishing medium outlet of the gas fire extinguishing medium generator. 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 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 second pressure signal input end of the controller. The fire tube liquid leakage detection sensor is a submersible level transmitter. The submersible level transmitter includes a level transmitter body, the liquid level probe, and a pressure guiding tube connecting the transmitter body and the liquid level probe. The level transmitter body is installed outside the fire tube through a bracket. The pressure guiding tube passes through the fire tube. The liquid level probe is arranged at the lower part inside 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. The outlet of the branch pipeline is connected to the shell of the fire tube burner. The bracket is installed on the shell of the burner or the heating furnace. The pressure guiding tube passes through the shell of the burner and enters the fire tube or directly enters the fire tube. The body of the image and video flame recognizer is installed on the shell of the burner blower or the heating furnace. The shell of the burner blower or the heating furnace includes an observation hole. The lens of the image and video flame recognizer passes through the observation hole and enters the inside of the shell of the burner blower or the heating furnace.

2. The fire extinguishing device according to claim 1, characterized in that, The pressure sensor is a flash pressure sensor. The flash pressure sensor 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. 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.

3. The fire extinguishing device according to claim 1, characterized in that, The electric control valve includes a valve opening and closing signal output end. The valve opening and closing signal output end of the electric control valve is connected to the electric control valve valve opening and closing signal input end of the controller.

4. The fire extinguishing device according to claim 3, characterized in that, The control circuit includes a starting circuit for a gas fire extinguishing medium generator. The starting circuit for the gas fire extinguishing medium generator includes a relay, a relay driving circuit, a lead wire hot spot igniter, and a normally open contact of the relay is connected in series between the lead wire ignition power supply and the lead wire hot spot igniter; the control end of the relay driving circuit is connected to the ignition control signal output end of the controller, and the relay power supply, the relay coil and the relay driving circuit are connected in series.

5. The fire extinguishing device according to claim 4, characterized in that, It includes a fire lead wire, a fire lead wire protection tube, a starting box and a control box. The lead wire hot spot igniter is arranged in the starting box, and the controller, the relay and the relay driving circuit are arranged in the control box; one end of the fire lead wire protection tube is connected to the starting box, and the other end is connected to the fire lead wire inlet of the gas fire extinguishing medium generator; the first end of the fire lead wire is located in the starting box, close to the fire lead wire hot spot igniter, and the other end of the fire lead wire passes through the fire lead wire protection tube and enters the gas fire extinguishing medium generator; the fire tube fire extinguishing unit is installed in the firing room of the oilfield heating furnace, and the gas fire extinguishing medium fire extinguisher is installed outside the firing room. The fire lead wire protection tube passes through the wall of the firing room to connect the starting box and the gas fire extinguishing medium fire extinguisher, and the main pipeline passes through the wall of the firing room to connect with the branch pipeline.

6. The fire extinguishing device according to claim 4, characterized in that When the fire extinguishing device of the oilfield heating furnace works, it includes the following steps: 601) The controller and the liquid leakage detection sensor monitor the oil leakage of the fire tube in real time. When the controller receives the oil leakage signal of the oilfield heating furnace fire tube sent by any liquid leakage detection sensor, it immediately notifies the controller in the main control room of the oilfield heating furnace to cut off the power supply and stop the gas supply of the leaking fire tube; 602) The controller notifies the image video flame recognizer of the leaking fire tube to detect the flame of the leaking fire tube. If the flame can still be detected in the leaking fire tube after the power supply and gas supply are cut off, the image video flame recognizer of the leaking fire tube returns a signal of detecting the flame to the controller; 603) After the controller receives the signal of detecting the flame, it closes the electric control valves that have nothing to do with this fire extinguishing, and the electric control valve corresponding to the leaking fire tube remains open; 604) The closed electric control valve feeds back a valve closing signal to the controller, and the controller triggers the starting circuit of the gas fire extinguishing medium generator, and high-pressure gas fire extinguishing medium is generated and ejected in the gas fire extinguishing medium generator; 605) The gas fire extinguishing medium ejected from the gas fire extinguishing medium generator is input into the leaking fire tube through the conveying pipeline to extinguish the flame generated by the oil leakage of the oilfield heating furnace fire tube.

7. The fire extinguishing device according to claim 6, wherein, The main pipeline is equipped with a pressure sensor at the gas extinguishing medium outlet part near the gas extinguishing medium generator. 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 tube extinguishing unit includes a pressure sensor. The pressure sensor of the fire tube 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 extinguishing unit is connected to the second pressure signal input end of the controller; when the fire extinguishing device of the oilfield heating furnace is working, it further includes the following steps: after the pressure sensors in the main pipeline for transporting the gas extinguishing medium and the branch pipeline corresponding to the liquid leakage fire tube sense the pressure of the high-pressure gas extinguishing medium, they respectively feedback to the controller the information that the gas extinguishing medium generator ejects high-pressure gas extinguishing medium and the high-pressure gas extinguishing medium reaches the fire tube, so as to confirm that the fire extinguishing device works normally; if the controller does not receive the corresponding gas extinguishing medium pressure signal, an alarm signal will be activated.

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