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 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 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 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 fire tube of the oilfield heating furnace; 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 a high-pressure foam fire extinguishing medium into the fire tube through the main pipeline and the branch pipeline, and can 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 for 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, burner, and flue pipe. The burner is mounted on the exterior of 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 convects 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 it, 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 fire tubes difficult. [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, comprising 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 oilfield heating furnace includes a fire tube, and 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 fire tube of the oilfield heating furnace; 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 fire extinguishing device described above includes a tee joint and two fire tube fire extinguishing units, and the oilfield heating furnace includes two fire tubes; 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 one outlet of the tee joint; the outlets of the branch pipelines of the two fire tube fire extinguishing units are respectively connected to one of the fire tubes, and the rear part of the fire tube shell is equipped with at least one foam fire extinguishing medium injection pipe facing the inner cavity of the fire tube, and the outlet of the branch pipeline is connected to the foam fire extinguishing medium injection pipe.

[0006] In the fire extinguishing device described above, the foam fire extinguishing medium injection pipe includes a nozzle, a mounting flange and a pipe joint. The shell at the rear of the fire tube includes a nozzle hole corresponding to the foam fire extinguishing medium injection pipe, and the nozzle passes through the nozzle hole to enter the interior of the fire tube; the mounting flange of the foam fire extinguishing medium injection pipe is fixed on the shell of the fire tube, and the pipe joint of the foam fire extinguishing medium injection pipe is connected to the outlet of the branch pipe through a connecting pipe.

[0007] For the fire extinguishing device described above, the fire cylinder fire extinguishing unit includes a pressure sensor. The pressure sensor of the fire cylinder 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 cylinder fire extinguishing unit is connected to the pressure signal input end of the controller.

[0008] For the fire extinguishing device described above, 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.

[0009] For the fire extinguishing device described above, the fire cylinder fire extinguishing unit includes a fire cylinder liquid leakage detection sensor and an image and video flame identifier. The liquid level probe of the fire cylinder liquid leakage detection sensor is installed in the corresponding fire cylinder. The signal output end of the fire cylinder liquid leakage detection sensor is connected to the fire cylinder liquid leakage signal input end of the controller; the control end and the monitoring signal output end of the image and video flame identifier are respectively connected to the controller; the electric control valve includes a valve opening and closing signal output end, and 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.

[0010] For the fire extinguishing device described above, the fire cylinder 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 guide pipe connecting the transmitter body and the liquid level probe. The level transmitter body is installed outside the fire cylinder through a bracket. The liquid level probe is arranged at the lower part inside the fire cylinder; the signal output end of the level transmitter is connected to the fire cylinder liquid leakage signal input end of the controller; the bracket is installed on the shell at the rear end of the fire cylinder, and the pressure guide pipe passes through the shell of the fire cylinder and enters the fire cylinder; the body of the image and video flame identifier is installed on the shell at the rear end of the fire cylinder. There is an observation hole on the shell at the rear end of the fire cylinder, and the lens of the image and video flame identifier passes through the observation hole and enters the fire cylinder.

[0011] For the fire extinguishing device described above, it 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. 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 main pipeline described above; the control ends of the electric valve and the booster pump are respectively connected to the control signal output end of the controller.

[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 of the main control room of the oilfield heating furnace to cut off the power supply and stop the gas supply to the leaking fire tube.

[0014] 902) The controller notifies the image and 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 and 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. 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 in 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.

[0017] 905) The foam fire extinguishing medium ejected from the foam fire extinguishing device is transported to the leaking fire tube through the main pipeline and the branch pipeline to extinguish the flame generated by the oil leakage of the oilfield heating furnace fire tube.

[0018] The above-mentioned fire extinguishing device 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 control end of the alarm circuit is connected to 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 pressure signal input end of the controller; when the fire extinguishing device of the oilfield heating furnace works, it also includes the following steps:

[0019] 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.

[0020] 1002) After the pressure sensor in the branch pipeline corresponding to the leaking fire tube senses the pressure of the high-pressure foam fire extinguishing medium, it feeds back the information that the high-pressure foam fire extinguishing medium has reached the fire tube to the controller to confirm that the fire extinguishing device is working properly; if the controller does not receive the corresponding foam fire extinguishing medium pressure signal, it alarms through the alarm circuit.

[0021] Once the leakage of the fire tube of the oilfield heating furnace is detected in the present invention, the control circuit can start the gas foam fire extinguishing device, and convey the high-pressure foam 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 leakage of the fire tube. [BRIEF DESCRIPTION OF THE DRAWINGS]

[0022] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0023] Figure 1 is the front view of the fire extinguishing device of the oilfield heating furnace in the embodiment of the present invention.

[0024] Figure 2 is the right view of the fire extinguishing device of the oilfield heating furnace in the embodiment of the present invention.

[0025] Figure 3 is the perspective view of the oil foam fire extinguishing medium injection pipe in the embodiment of the present invention.

[0026] Figure 4 is the perspective view of the fire tube leakage detection sensor in the embodiment of the present invention. [DETAILED DESCRIPTION OF THE INVENTION]

[0027] The structure of the oilfield heating furnace fire extinguishing device in the embodiment of the present invention is as Figures 1 to 4 shown, including 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 high-pressure foam fire extinguishing medium, a tee joint 15, two fire tube fire extinguishing units 60 and a control circuit. The oilfield heating furnace 100 generally has two fire tubes 20, so two fire tube fire extinguishing units 60 need to be equipped. The control circuit includes a controller.

[0028] The foam fire extinguishing device 10 is equipped with a negative pressure type proportioner 10B, and the negative pressure type proportioner 10B is connected to the main body 1 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.

[0029] The electric valve 17 and the booster pump 18 are connected in series between the pressure water inlet pipe 16 and the inlet of the negative pressure type proportioner 10B, and the outlet of the negative pressure type proportioner 10B is used as the foam fire extinguishing medium outlet of the foam fire extinguishing device and is connected to the inlet of the main pipeline 14. The pressure water inlet pipe 16 is equipped with a water inlet pressure sensor 161, 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 water inlet pressure sensor 161 is connected to the water inlet pressure signal input end of the controller.

[0030] Each fire tube extinguishing unit 60 includes a branch pipeline 61, an electrically controlled valve 62, a flash pressure sensor 63, a liquid leakage detection sensor 50, and an AI image / video flame identifier (not shown in the figure). The inlet of the tee joint 15 is connected to the main pipeline 14, and the inlets of the branch pipelines 61 of 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 two fire tube extinguishing units are respectively connected to one fire tube. Two foam fire extinguishing medium injection pipes 12 facing the inner cavity of the fire tube are installed at the rear of the fire tube housing, and the outlets of the branch pipelines are respectively connected to the two foam fire extinguishing medium injection pipes 12.

[0031] 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 on the rear plate 21 of the fire tube 20, and the nozzle 121 passes through the nozzle hole into the interior of the fire tube 20. The mounting flange 122 of the foam fire extinguishing medium injection pipe 12 is fixed on the rear plate 21 of the fire tube, 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.

[0032] The electrically controlled valve 62 and the flash pressure sensor 63 are installed in the branch pipeline 61. The electrically controlled 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 electrically controlled valve 62 and the outlet of the branch pipeline 61, and the outlet of the branch pipeline 61 is connected to the foam fire extinguishing medium injection pipe 12. During extinguishing, the high-pressure foam fire extinguishing medium generated by the foam fire extinguishing device 10 enters the on-fire fire tube 20 of the oilfield heating furnace 100 through the main pipeline 14, the tee joint 15, the branch pipeline 61, and the foam fire extinguishing medium injection pipe 12.

[0033] The valve of the electrically controlled valve 62 is normally open. The control end of the electrically controlled valve 62 is connected to the control signal output end of the controller, and the valve opening and closing signal output end of the electrically controlled valve 62 is connected to the electrically controlled 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, and the signal output end of the liquid leakage detection sensor 50 is connected to the liquid leakage detection signal input end of the controller. The signal output end of the AI image / video flame identifier is connected to the flame recognition signal input end of the controller.

[0034] The flash pressure sensor 63 in 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.

[0035] As Figure 4As shown in the figure, 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 on the rear plate 21 of the oilfield heating furnace fire tube through a bracket 54. The pressure guide tube 53 passes through the rear plate 21 of the fire tube and enters the fire tube 20. The level probe 52 is located 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 controller.

[0036] The AI image and video flame recognizer 70 is fixed on the rear plate 21 of the oilfield heating furnace fire tube. There is an observation hole on the rear plate 21 of the fire tube. The lens of the AI image and video flame recognizer 70 passes through the observation hole and enters the fire tube 20. The signal output end of the AI image and video flame recognizer 70 is connected to the flame recognition signal input end of the controller.

[0037] When the oilfield heating furnace fire extinguishing device in the above embodiment of the present invention works, it includes the following steps:

[0038] 1) The controller monitors the water pressure in the water inlet pipe in real time. When the water pressure in the water inlet pipe is lower than the set value, the controller alarms through the alarm circuit;

[0039] 2) Each liquid leakage detection sensor monitors the oil leakage in the fire tube of its own unit in real time. When the controller of the control circuit receives the oil leakage signal sent by any liquid leakage detection sensor, it immediately notifies the main control room of the oilfield heating furnace to cut off the power supply and stop the gas supply to the fire tube with oil leakage;

[0040] 3) After the burner of the fire tube with oil leakage cuts off the power supply and stops the gas supply, the main control room of the oilfield heating furnace notifies the controller to detect the flame inside the fire tube with oil leakage. The controller starts the relevant AI image recognition flame detector to work;

[0041] 4) If the relevant AI image recognition flame detector can still detect an open flame after cutting off the power supply and stopping the gas supply, 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 fire tube with liquid leakage in the open state;

[0042] 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 forms a high-pressure foam fire extinguishing medium that sprays out from the outlet of the negative pressure type proportioning mixer; the fire extinguishing medium is sprayed into the fire tube with oil leakage through the main pipeline and branch pipelines to extinguish the flame generated by the oil leakage in the oilfield heating furnace fire tube;

[0043] 6) The pressure sensor in the branch pipeline of the fire barrel that conveys the foam fire extinguishing medium and leaks oil 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 fire barrel 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 turns on the alarm signal to prevent the fire of the leaking fire barrel 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, and is characterized in that, It includes a main pipeline for transporting foam fire extinguishing medium and a barrel fire extinguishing unit. The fire extinguisher is a foam fire extinguishing device. The barrel 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 barrel of the oilfield heating furnace. The control circuit includes a controller. 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 barrel fire extinguishing unit includes an image and video flame identifier. The liquid level probe of the barrel liquid leakage detection sensor is installed in the corresponding barrel, and the signal output end of the barrel liquid leakage detection sensor is connected to the barrel liquid leakage signal input end of the controller. The control end and the monitoring signal output end of the image and video flame identifier are respectively connected to the controller. It includes a three-way joint and two of the barrel fire extinguishing units. The oilfield heating furnace includes two of the barrels. The inlet of the three-way joint is connected to the main pipeline, and the inlets of the branch pipelines of the two barrel fire extinguishing units are respectively connected to one outlet of the three-way joint. The outlets of the branch pipelines of the two barrel fire extinguishing units are respectively connected to one of the barrels. At least one foam fire extinguishing medium injection pipe facing the inner cavity of the barrel is installed at the rear of the barrel housing, and the outlet of the branch pipeline is connected to the foam fire extinguishing medium injection pipe. The barrel fire extinguishing unit includes a pressure sensor. The pressure sensor of the barrel 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 barrel fire extinguishing unit is connected to the pressure signal input end of the controller. The barrel liquid leakage detection sensor is a submersible liquid level transmitter. The submersible liquid level transmitter includes a liquid level transmitter body, the liquid level probe, and a pressure guiding pipe connecting the transmitter body and the liquid level probe. The liquid level transmitter body is installed outside the barrel through a bracket, and the liquid level probe is arranged at the lower part inside the barrel. The signal output end of the liquid level transmitter is connected to the barrel liquid leakage signal input end of the controller. The bracket is installed on the housing at the rear end of the barrel, and the pressure guiding pipe passes through the housing of the barrel and enters the barrel. The body of the image and video flame identifier is installed on the housing at the rear end of the barrel. There is an observation hole on the housing at the rear end of the barrel, and the lens of the image and video flame identifier passes through the observation hole and enters the barrel.

2. The fire extinguishing device 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. There is a spray pipe hole corresponding to the foam fire extinguishing medium injection pipe on the housing at the rear of the barrel. The spray pipe passes through the spray pipe hole and enters the interior of the barrel. The mounting flange of the foam fire extinguishing medium injection pipe is fixed on the housing of the barrel, 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 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, 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.

4. 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.

5. The fire extinguishing device according to claim 4, wherein It includes an inlet pipeline, an electric valve and a booster pump. The foam fire extinguishing device includes a negative pressure type proportioner; the electric valve and the booster pump are connected in series between the inlet pipeline and the inlet of the negative pressure type proportioner, and the outlet of the negative pressure type proportioner serves as the foam fire extinguishing medium outlet of the foam fire extinguishing device and is connected to the main pipeline; 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.

6. The fire extinguishing device according to claim 5, 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 of 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 the valve closing signal to the controller. The controller opens the electric valve and starts the booster pump. The pressurized water enters the negative pressure type proportioner, triggering the generation of high-pressure foam in 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 sprayed out from the outlet of the negative pressure type proportioner; 605) The foam fire extinguishing medium sprayed out from the foam fire extinguishing device is transported to the leaking fire tube through the main pipeline and the branch 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, characterized in that, It includes an inlet water pressure sensor and an alarm circuit. The inlet water pressure sensor is installed on the inlet pipeline, and the output end of the inlet water pressure sensor is connected to the inlet water pressure signal input end of the controller; the control end of the alarm circuit is connected to 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 pressure signal input end of the controller. When the fire extinguishing device of the oilfield heating furnace works, it also includes the following steps: 701) The controller monitors the water pressure of the inlet pipeline in real time. When the water pressure of the inlet pipeline is lower than the set value, the controller alarms through the alarm circuit; 702) After the pressure sensor in the branch pipeline corresponding to the leaking fire tube senses the pressure of the high-pressure foam fire extinguishing medium, it feeds back information to the controller that there is high-pressure foam fire extinguishing medium reaching the fire tube in the foam fire extinguishing device to confirm that the fire extinguishing device is working properly; if the controller does not receive the corresponding foam fire extinguishing medium pressure signal, it alarms through the alarm circuit.

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