A gas fire extinguishing system for oil field heating furnace

Abstract

The present invention discloses a gas fire extinguishing system for oilfield heating furnaces. The system includes a gas fire extinguishing medium generator, a fire protection line, a main control circuit, a main pipe for conveying smoke, and multiple heating furnace fire extinguishing units. The heating furnace fire extinguishing units include branch pipes, a unit control circuit, and electrically controlled valves associated with the furnace's fire tubes. The main pipe inlet is connected to the gas fire extinguishing medium outlet of the gas fire extinguishing medium generator, while the branch pipe inlet is connected to the main pipe. The branch pipes are connected to the corresponding fire tubes via electrically controlled valves. The unit control circuit includes a controller, and the control terminal of the electrically controlled valve is connected to the control signal output terminal of the controller. The gas fire extinguishing system of the present invention, equipped with a single gas fire extinguishing medium generator, can extinguish oil leaks in multiple oilfield heating furnaces within the system, resulting in a low investment cost.

Description

[Technical field]

[0001] The invention relates to a fire extinguishing system for an oilfield heating furnace, in particular to a gas fire extinguishing system for an oilfield heating furnace. [Background Technology]

[0002] Oilfield heating furnace, also known as fire tube furnace, is a heating equipment widely used in oilfields to heat multiphase mixed liquids in oilfield production. Usually, multiple oilfield heating furnaces are installed side by side in their respective workshops.

[0003] The multiphase mixture heated in oilfield heating furnaces consists of oil, water, and other impurities. These furnaces consist of a furnace body and a fire tube. The fire tube, the furnace's primary heating device, comprises a fire tube, burner, and flue pipe. The burner is mounted on the exterior of the furnace, at one end of the fire tube. Fuel is ignited in the burner at one end of the fire tube and sprayed into the tube for combustion. The multiphase mixture outside the tube convects heat with the outer wall of the 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 firefighting difficult.

[0004] Patent number CN200920050110.3 discloses a fire prevention device specifically designed for flammable liquid storage tanks, comprising a generator, an injection device, and a detection and activation device. The generator's sieve-shaped guide tube is conical with a larger diameter at the top, ensuring that the pyrotechnic extinguishing agent and dry powder are loaded 2 to 4 centimeters above the generator's top flange. The pyrotechnic extinguishing agent and dry powder are loaded in layers in the space outside the sieve-shaped guide tube within the generator. The pyrotechnic extinguishing agent and dry powder are compressed three to five times during loading, resulting in a tight outer and loose inner structure. The detection and activation device includes a fusible alloy probe, a temperature-sensitive flame-activated composite fuse, a fire fuse, a remote manual activation button, and a remote activation box. The nozzle of the injection device is located at the top of the tank interior. When a fire occurs inside a storage tank, the utility model uses a pyrotechnic fire extinguishing agent to be ignited in a spiral manner by the fire fuse core. The initially burning agent generates a spiral high-pressure airflow consistent with the ignition method. The bulk pyrotechnic fire extinguishing agent partially reacts in a suspended state inside the smoke generator, carrying the dry powder fire extinguishing agent into the smoke duct through the spiral high-pressure airflow and the gas generated by the agent itself, and continues to react. The resulting mixed fire extinguishing medium is sprayed into the storage tank through a nozzle at a very high pressure (1.3 to 1.8 MPa). The flame inside the tank is first mechanically cut to suppress the flame, and finally covered by a full flooding method. Through inert gas asphyxiation, heat absorption by solid particles, and chain suppression, the fire is extinguished within 30 seconds. The utility model's fire prevention device can only extinguish a fire on one device, and cannot extinguish a fire on multiple devices. The cost of installing a set of fire prevention devices for each device is high, resulting in a waste of investment. [Summary of the invention]

[0005] The technical problem to be solved by the present invention is to provide a gas fire extinguishing system for an oilfield heating furnace which can prevent fires of multiple devices.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is a gas fire extinguishing system for an oilfield heating furnace, including a gas fire extinguishing medium generator, a fire fuse, a main control circuit, a main line for conveying smoke and a plurality of heating furnace fire extinguishing units. The heating furnace fire extinguishing unit includes a branch pipeline, a unit control circuit and an electric control valve matching the fire tube of the heating furnace. 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 branch pipeline is connected to the corresponding fire tube through the electric control valve; the unit 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.

[0007] The gas fire extinguishing system described above, the heating furnace fire extinguishing unit includes a leakage detection sensor matched with the fire tube of the heating furnace and an image video flame identifier matched with the fire tube of the heating furnace, the liquid level probe of the leakage detection sensor is installed in the corresponding fire tube, and the signal output end of the leakage detection sensor is connected to the fire tube leakage signal input end of the controller; the image video flame identifier is installed on the fan of the burner or the heating furnace, 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 and closing signal output end, and the valve opening and closing signal output end of the electric control valve is connected to the valve opening and closing signal input end of the controller; the leakage The liquid detection sensor is a submersible liquid level transmitter, which includes a liquid level transmitter body, the liquid level probe and a pressure pipe connecting the transmitter body and the liquid level probe. The liquid level transmitter body is installed on the outside of the fire tube through a bracket, the pressure pipe passes through the fire tube, and the liquid level probe is arranged at the lower part of the fire tube; the signal output end of the liquid level transmitter is connected to the fire tube leakage signal input end of the controller; the body of the image and video flame identifier is installed on the housing of the burner fan or the heating furnace, the housing of the burner fan or the heating furnace includes an observation hole, and the lens of the image and video flame identifier passes through the observation hole into the interior of the burner fan housing or the interior of the heating furnace.

[0008] The gas fire extinguishing system described above, the heating furnace fire extinguishing unit includes a pressure sensor matched with the fire tube of the heating furnace, the pressure sensor of the heating furnace fire extinguishing unit is installed on the pipeline connecting the corresponding fire tube and the electric control valve, and the pressure signal output end of the pressure sensor of the heating furnace fire extinguishing unit is connected to the pressure signal input end of the controller; the branch pipeline is connected to the burner shell or heating furnace of the corresponding fire tube through the matching electric control valve; the bracket of the immersion liquid level transmitter is installed on the oil burner shell or heating furnace, and the pressure pipe passes through the burner shell and enters or directly enters the heating furnace fire tube.

[0009] The main control circuit of the gas fire extinguishing system described above includes a main controller and a lead electric ignition device, the control end of the lead electric ignition device is connected to the ignition control signal output end of the main controller; the controller of the heating furnace fire extinguishing unit is communicatively connected to the main controller.

[0010] In the gas fire extinguishing system described above, the lead electric ignition device includes a relay, a relay drive circuit, a fire lead electric thermal igniter, and a relay normally open contact connected in series between the fire lead ignition power supply and the fire lead electric thermal igniter; the control end of the relay drive circuit is connected to the ignition control signal output end of the controller, and the relay power supply, relay coil and relay drive circuit are connected in series; the main line is equipped with a pressure sensor near the smoke outlet of the gas fire extinguishing medium generator, and the pressure signal output end of the main line pressure sensor is connected to the pressure signal input end of the main controller.

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

[0012] In the gas fire extinguishing system described above, the heating furnace fire extinguishing unit is installed in the workshop of the corresponding oilfield heating furnace, one of the multiple workshops serves as the main control room, the start box and the main control box are installed indoors in the main control room, the gas fire extinguishing medium generator is installed outdoors in the main control room, the fire protection pipe passes through the wall of the main control room to connect the start box and the gas fire extinguishing medium generator, the main line passes through the wall of the workshop and is connected to the branch line; the main controller also serves as the controller of the heating furnace fire extinguishing unit in the main control room.

[0013] In the gas fire extinguishing system described above, the pressure sensor is a flash pressure sensor, which includes a voltage-variable bridge, a signal amplifying circuit and an analog-to-digital converter. The output end of the voltage-variable bridge is connected to the input end of the signal amplifying circuit, and the output end of the signal amplifying circuit is connected to the pressure signal input end of the controller or main controller through the analog-to-digital converter.

[0014] The gas fire extinguishing system described above, the gas fire extinguishing system of the oil field heating furnace, includes the following steps when working:

[0015] 901) The controller and leakage detection sensor of each heating furnace fire extinguishing unit monitors the oil leakage of the unit's fire tube in real time. When the controller of any heating furnace fire extinguishing unit receives an oil leakage signal from the leakage detection sensor of the unit, the controller of the heating furnace fire extinguishing unit sends a signal to the control room of the oilfield heating furnace, and the control room of the oilfield heating furnace cuts off the power and gas to the leaking fire tube;

[0016] 902) After the power and gas supply to the leaking burner are cut off, the control room notifies the controller of the heating furnace fire extinguishing unit to detect the flame in the leaking burner and activate the relevant image and video flame recognition device. If an open flame can still be detected in the leaking burner after the power and gas supply are cut off, the controller of the heating furnace fire extinguishing unit sends a signal to the main controller to activate the ignition device;

[0017] 903) After the main controller receives the signal to start the ignition device, it controls the fuse electric ignition device to ignite the fire fuse. The burning fire fuse ignites the gas fire extinguishing medium extinguishing agent in the gas fire extinguishing medium generator. The gas fire extinguishing medium generator generates high pressure to cause the gas fire extinguishing medium or gas to be ejected. The high-pressure gas fire extinguishing medium ejected from the gas fire extinguishing medium generator is input into the leaking fire tube through the main pipeline and branch pipeline to extinguish the flame generated by the oil leakage in the oil field heating furnace fire tube.

[0018] In the gas fire extinguishing system described above, the electric control valve is normally open, the heating furnace fire extinguishing unit includes a pressure sensor matched with the heating furnace's fire tube, the pressure sensor of the heating furnace fire extinguishing unit is installed on the pipeline connecting the corresponding fire tube and the electric control valve, and the pressure signal output end of the heating furnace fire extinguishing unit pressure sensor is connected to the pressure signal input end of the controller. The gas fire extinguishing system of the oilfield heating furnace includes the following steps when in operation:

[0019] 1001) After receiving the signal to start the ignition device, the main controller first notifies the controllers of each heating furnace fire extinguishing unit to close all the electric control valves not related to this fire extinguishing, leaving only the electric control valve corresponding to the leaking fire tube in the open state. The closed electric control valve feeds back the valve closing signal to the main controller through the controller of the heating furnace fire extinguishing unit. After receiving the closing signal of all the electric control valves not related to this fire extinguishing, the main controller controls the fuse electric ignition device to ignite the fire fuse;

[0020] 1002) The pressure sensor in the main line senses the pressure of the high-pressure gas fire extinguishing medium and feeds back to the main controller a signal indicating that the gas fire extinguishing medium generator has ignited and is outputting the high-pressure gas fire extinguishing medium. If the main controller does not receive the pressure signal fed back by the main line pressure sensor after activating the fire fuse electric heating igniter, the main controller activates an alarm signal;

[0021] 1003) The pressure sensor in the branch pipeline of the gas fire extinguishing medium transporting the leaking fire tube senses the pressure of the high-pressure gas fire extinguishing medium, and feeds back the information that the high-pressure gas fire extinguishing medium has arrived at the fire tube to the controller of the heating furnace fire extinguishing unit. The controller of the heating furnace fire extinguishing unit then transmits the pressure signal of the high-pressure gas fire extinguishing medium arrival to the main controller to confirm that the fire extinguishing device is working normally; if the controller of the heating furnace fire extinguishing unit does not receive the corresponding gas fire extinguishing medium pressure signal and informs the main controller, the main controller activates the alarm signal to prevent the fire tube from leaking oil and getting out of control.

[0022] The gas fire extinguishing system of the present invention is equipped with one gas fire extinguishing medium generator to extinguish oil leakage fires of multiple oilfield heating furnaces in the system, and the investment cost is low. [Brief Description of the Drawings]

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Figure 1 It is a three-dimensional diagram of a gas fire extinguishing system for an oilfield heating furnace according to an embodiment of the present invention.

[0025] Figure 2 It is a front view of a gas fire extinguishing system for an oilfield heating furnace according to an embodiment of the present invention.

[0026] Figure 3 yes Figure 1 A partial enlarged view of part I in the middle.

[0027] Figure 4 yes Figure 2 A partial enlarged view of part II.

[0028] Figure 5 It is a three-dimensional diagram of a fire gun leakage detection sensor according to an embodiment of the present invention.

[0029] Figure 6 1 is a circuit diagram of a smoke generator starting circuit according to an embodiment of the present invention. [Specific implementation method]

[0030] The structure of the gas fire extinguishing system of the oilfield heating furnace according to the embodiment of the present invention is as follows: Figures 1 to 6 As shown, it is used to extinguish oil leakage faults in the fire tubes of three parallel oilfield heating furnaces 40. Each oilfield heating furnace 40 is installed in a corresponding workroom (fire room) 20. Each oilfield heating furnace 40 has two fire tubes, and the rear end of each fire tube is equipped with a burner and a fan for burning the fire tube.

[0031] The gas fire extinguishing system includes a smoke generator 10, a fire protection lead, a main control circuit, a main pipe 14 for conveying smoke, and three heating furnace fire extinguishing units. The inlet of the main pipe 14 is connected to the smoke outlet 13 of the smoke generator 10.

[0032] The gas fire extinguishing medium generator may also be a trifluoromethane (nitrogen) generator, a carbon dioxide generator, a heptafluoropropane generator or a perfluorohexanone generator. The gas fire extinguishing medium generator in this embodiment is described using a smoke generator as an example.

[0033] The heating furnace fire extinguishing unit includes a branch pipeline 61, two liquid leakage detection sensors 50 matched with the fire tubes, two image and video flame identifiers (not shown in the figure) matched with the fire tubes, and a unit control circuit.

[0034] The branch line 61 includes a three-way connector 15, two electrically controlled valves 62 for use with the fire tube, and two flash pressure sensors 63 for use with the fire tube. The inlet of the three-way connector 15 is connected to the main line 14, and the two outlets of the three-way connector 15 are connected to the burner housing 41 of the corresponding fire tube through an electrically controlled valve 62 and a hose 65. The flash pressure sensor 63 is installed between the electrically controlled valve 62 and the hose 65. When extinguishing a fire, the high-pressure smoke generated by the smoke generator 10 passes through the main line 14, the three-way connector 15, and the branch line 61, and enters the fire tube of the oilfield heating furnace 40 from the burner housing 41 or directly enters the leaking oil tube.

[0035] The video flame identifier is installed on the fan of a fire tube burner or a heating furnace. The main body of the video flame identifier is mounted on the housing of the burner fan or heating furnace. The housing has an observation hole, through which the video flame identifier lens enters the burner fan housing or heating furnace.

[0036] The unit control circuit includes a microcontroller (MCU). The electronically controlled valve 62 is normally open. The control terminal of the electronically controlled valve 62 is connected to the control signal output terminal of the microcontroller MCU. The valve opening and closing signal output terminal of the electronically controlled valve 62 is connected to the valve opening and closing signal input terminal of the microcontroller MCU. The pressure signal output terminal of the flash pressure sensor 63 is connected to the pressure signal input terminal of the microcontroller MCU. The signal output terminal of the liquid leakage detection sensor 50 is connected to the liquid leakage detection signal input terminal of the microcontroller MCU. The signal output terminal of the image and video flame identifier is connected to the flame identification signal input terminal of the microcontroller MCU.

[0037] The liquid level probe of the liquid leakage detection sensor 50 is installed in the corresponding fire tube, and the signal output end of the liquid leakage detection sensor 50 is connected to the fire tube liquid leakage signal input end of the microcontroller MCU.

[0038] like Figure 5As shown, in this embodiment, the leakage detection sensor 50 is a submersible liquid level transmitter. The submersible liquid level transmitter includes a liquid level transmitter body 51, a liquid level probe 52, and a pressure pipe 53 connecting the transmitter body 51 and the liquid level probe 52. The liquid level transmitter body 51 is mounted on the exterior of the burner housing 41 of the oilfield heating furnace via a bracket 54. The pressure pipe 53 passes through the burner housing 41 and enters the furnace. The liquid level probe 52 is positioned at the bottom of the furnace furnace. The signal output terminal of the liquid level transmitter is connected to the control signal input terminal of the microcontroller MCU.

[0039] The main control circuit includes a main control MCU and a lead-type electric ignition device. The control terminal of the lead-type electric ignition device is connected to the ignition control signal output terminal of the main control MCU. The microcontrollers MCU of all heating furnace fire extinguishing units are connected to the main control MCU via communication line 17, sending oil leakage signals detected by the liquid leakage detection sensor 50 to the main control MCU. When the smoke generator 10 is ignited, the microcontroller MCU sends the pressure signal between the branch pipe 61 and the leaking burner detected by the flash pressure sensor 63 to the main control MCU.

[0040] like Figure 4 As shown, a flash pressure sensor 16 is installed on the riser of the main line 14 near the smoke outlet 13 of the smoke generator 10. The pressure signal output terminal of the flash pressure sensor 16 on the main line 14 is connected to the pressure signal input terminal of the main control MCU.

[0041] The flash pressure sensor 16 and the flash pressure sensor 63 of this embodiment each include a voltage-variable bridge, a signal amplifying circuit and an analog-to-digital converter. The output end of the voltage-variable bridge is connected to the input end of the signal amplifying circuit, and the output end of the signal amplifying circuit is connected to the pressure signal input end of the microcontroller MCU or the main control MCU through the analog-to-digital converter.

[0042] like Figure 6 As shown, the smoke generator startup circuit includes a relay K, a relay drive circuit, and an electric igniter for the fire protection lead. The relay's normally open contact K1 is connected in series between the fire protection lead's ignition power supply and the electric igniter. The control terminal of the relay drive circuit, serving as the smoke generator startup circuit's control terminal, is connected to the controller's ignition control signal output terminal. The relay power supply, relay coil, and relay drive circuit are connected in series.

[0043] like Figure 6 As shown, in this embodiment, the electric heating igniter is a coiled heating wire. The fire fuse ignition power supply is AC 220V mains electricity, and the fire fuse passes through the inner hole of the coiled heating wire. The relay drive circuit uses transistor Q1. The ignition control signal output terminal of the microcontroller MCU is connected to the base of transistor Q1 through resistor R1. The DC 5V relay power supply and the coil of relay K are connected in series with transistor Q1.

[0044] Of the three workrooms 20, one, 20A, serves as the main control room. The main control circuitry includes a starter box 30 and a main control box 02A. The fire-fighting fuse electric heating igniter is housed in the starter box 30, along with the main control MCU, relays, and relay driver circuitry. One end of the fire-fighting fuse protective conduit 11 is connected to the starter box 30, and the other end is connected to the fire-fighting fuse inlet 12 of the smoke generator 10. One end of the fire-fighting fuse is secured to the starter box 30, passing through the coiled heating wire of the fire-fighting fuse electric heating igniter. The other end of the fire-fighting fuse passes through the fire-fighting fuse protective conduit 11 and into the smoke generator 10.

[0045] The starter box 30 and the main control box 02A are installed on the inner wall of the wall 21A inside the main control room 20A, the smoke generator 10 is installed outside the main control room 20A, and the fire protection pipe 11 passes through the wall 21A of the main control room 20A to connect the starter box 30 and the smoke generator 10.

[0046] The main pipeline 14 passes through the wall 21 of each workroom 20 and connects to the branch pipeline 61 of each heating furnace fire extinguishing unit. Each workroom 20 contains a control box 02. The microcontroller MCU of each heating furnace fire extinguishing unit is located in the control box 02 of the corresponding workroom 20. The main control room does not contain a control box or other microcontroller MCU, but only a main control box 02A. The main control MCU in the main control box 02A also serves as the microcontroller for the unit control circuit of the heating furnace fire extinguishing unit in the main control room.

[0047] When the gas fire extinguishing system of the oilfield heating furnace of the above embodiment of the present invention is in operation, the microcontroller and liquid leakage detection sensor of each heating furnace fire extinguishing unit monitors the oil leakage of the unit's fire tube in real time. When the microcontroller of any heating furnace fire extinguishing unit receives the oil leakage signal of the oilfield heating furnace fire tube sent by the liquid leakage detection sensor of the unit, the microcontroller of the heating furnace fire extinguishing unit immediately sends a signal to the control room of the oilfield heating furnace, and the control room of the oilfield heating furnace cuts off the power and gas to the leaking fire tube. After the power and gas are cut off for the leaking fire tube, the control room notifies the microcontroller of the heating furnace fire extinguishing unit to detect the flame in the leaking fire tube and start the relevant image and video flame identifier to work. If an open flame can still be detected in the leaking fire tube after the power and gas are cut off, the microcontroller of the heating furnace fire extinguishing unit sends a signal to the main control MCU to start the ignition device.

[0048] After receiving the signal to activate the ignition device, the master MCU notifies the microcontrollers in each heating furnace fire extinguishing unit to close all electrically controlled valves unrelated to the fire, leaving only the electrically controlled valve corresponding to the leaking fire tube open. These closed electrically controlled valves transmit the valve closure signal back to the master MCU via the microcontrollers in the heating furnace fire extinguishing units. Upon receiving the closure signal from all unrelated electrically controlled valves, the master MCU controls the heating wire in the lead ignition device to ignite the fire fuse, which serves as the fuse. The burning fire fuse ignites the smoke extinguishing agent in the smoke generator, generating high pressure inside the smoke generator, causing smoke or gas to be ejected. The high-pressure smoke from the smoke generator is then fed through a pipeline into the leaking fire tube, quickly extinguishing the fire caused by the leak in the oilfield heating furnace fire tube.

[0049] In addition, the flash pressure sensor in the main line senses the pressure of the high-pressure smoke and sends a signal to the main control MCU that the smoke generator 10 has ignited and is outputting high-pressure smoke. If the main control MCU does not receive the pressure signal from the main line flash pressure sensor after activating the fire fuse electric igniter, the main control MCU will trigger an alarm signal to prevent the fire from getting out of control due to oil leakage in the ignition tube.

[0050] The flash pressure sensor in the branch pipeline that delivers smoke from the leaking fire tube senses the pressure of the high-pressure smoke and feeds back the information that the high-pressure smoke has reached the fire tube to the microcontroller of the heating furnace fire extinguishing unit. The microcontroller of the heating furnace fire extinguishing unit then transmits the pressure signal of the high-pressure smoke arrival to the main control MCU to confirm that the fire extinguishing device is working properly. If the microcontroller of the heating furnace fire extinguishing unit does not receive the corresponding smoke pressure signal and informs the main control MCU, the main control MCU will also activate the alarm signal to prevent the fire caused by the leaking oil from the fire tube from getting out of control.

Claims

1. A gas fire extinguishing system for an oilfield heating furnace, comprising a gas fire extinguishing medium generator, a fire protection lead and a main control circuit. The oilfield heating furnace comprises two fire tubes; characterized in that: The system comprises a main pipe for conveying smoke and a plurality of heating furnace fire extinguishing units. The heating furnace fire extinguishing units comprise branch pipes, a unit control circuit, and electrically controlled valves associated with the heating furnace's fire tubes. The main pipe inlet is connected to the gas fire extinguishing medium outlet of a gas fire extinguishing medium generator, and the branch pipe inlet is connected to the main pipe; the branch pipes are connected to the corresponding fire tubes via electrically controlled valves; the unit control circuit comprises a controller, the control terminal of the electrically controlled valve is connected to the control signal output terminal of the controller; the heating furnace fire extinguishing units comprise leakage detection sensors associated with the heating furnace's fire tubes and image and video flame identifiers associated with the heating furnace's fire tubes; the liquid level probes of the leakage detection sensors are installed in the corresponding fire tubes, and the signal output terminals of the leakage detection sensors are connected to the fire tube leakage signal input terminals of the controller; the main control circuit comprises a main controller, and the controller of the heating furnace fire extinguishing unit is communicatively connected to the main controller; The image and video flame identifier is installed on the fan or heating furnace of the burner, and 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 valve opening and closing signal input end of the electric control valve of the controller; the leakage detection sensor is a submersible liquid level transmitter, and the submersible liquid level transmitter includes a liquid level transmitter body, the liquid level probe and a pressure pipe connecting the transmitter body and the liquid level probe, the liquid level transmitter body is installed on the outside of the fire tube through a bracket, the pressure pipe passes through the fire tube, and the liquid level probe is arranged at the lower part of the fire tube; the signal output end of the liquid level transmitter is connected to the fire tube leakage signal input end of the controller; the body of the image and video flame identifier It is installed on the housing of the burner blower or the heating furnace. The housing of the burner blower or the heating furnace includes an observation hole. The lens of the image video flame identifier passes through the observation hole and enters the interior of the burner blower housing or the heating furnace. The heating furnace fire extinguishing unit includes a pressure sensor matched with the fire tube of the heating furnace. The pressure sensor of the heating furnace fire extinguishing unit is installed on the pipeline connecting the corresponding fire tube and the electric control valve. The pressure signal output end of the pressure sensor of the heating furnace fire extinguishing unit is connected to the pressure signal input end of the controller. The branch pipeline is connected to the burner housing or heating furnace of the corresponding fire tube through the matching electric control valve. The bracket of the immersion liquid level transmitter is installed on the oil burner housing or heating furnace, and the pressure pipe passes through the burner housing and enters or directly enters the heating furnace fire tube.

2. The gas fire extinguishing system according to claim 1, characterized in that: The main control circuit comprises a lead electric ignition device, and a control terminal of the lead electric ignition device is connected to an ignition control signal output terminal of the main controller.

3. The gas fire extinguishing system according to claim 2, characterized in that: The fuse electric ignition device includes a relay, a relay driving circuit, a fire fuse electric thermal igniter, and the normally open contact of the relay is connected in series between the fire fuse ignition power supply and the fire fuse electric thermal 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, relay coil and relay driving circuit are connected in series; the main line is equipped with a pressure sensor near the smoke outlet of the gas fire extinguishing medium generator, and the pressure signal output end of the main line pressure sensor is connected to the pressure signal input end of the main controller.

4. The gas fire extinguishing system according to claim 3, characterized in that: It includes a fire-fighting lead protective tube, the main control circuit includes a starter box and a main control box, the fire-fighting lead electric thermal igniter is arranged in the starter box, and the main controller, relay and relay drive circuit are arranged in the control box; one end of the fire-fighting lead protective tube is connected to the starter box, and the other end is connected to the fire-fighting lead inlet of the gas fire-extinguishing medium generator; the first end of the fire-fighting lead is located in the starter box, close to the fire-fighting lead electric thermal igniter, and the other end of the fire-fighting lead passes through the fire-fighting lead protective tube and enters the gas fire-extinguishing medium generator.

5. The gas fire extinguishing system according to claim 4, characterized in that: The heating furnace fire extinguishing unit is installed in the workshop of the corresponding oilfield heating furnace. One of the multiple workshops serves as the main control room. The starter box and main control box are installed indoors in the main control room. The gas fire extinguishing medium generator is installed outdoors in the main control room. The fire protection pipe passes through the wall of the main control room to connect the starter box and the gas fire extinguishing medium generator. The main line passes through the wall of the workshop to connect to the branch line. The main controller also serves as the controller of the heating furnace fire extinguishing unit in the main control room.

6. The gas fire extinguishing system according to claim 1 or 3, characterized in that: The pressure sensor is a flash pressure sensor, which includes a voltage-variable bridge, a signal amplification circuit and an analog-to-digital converter. The output end of the voltage-variable 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 or main controller through the analog-to-digital converter.

7. The gas fire extinguishing system according to claim 3, characterized in that: The gas fire extinguishing system of the oilfield heating furnace includes the following steps when working: 701) The controller and leakage detection sensor of each heating furnace fire extinguishing unit monitors oil leaks in the unit's burner in real time. When the controller of any heating furnace fire extinguishing unit receives an oil leak signal from its own leakage detection sensor indicating an oil field heating furnace burner, the controller of that heating furnace fire extinguishing unit sends a signal to the oil field heating furnace control room, which then shuts off power and gas to the leaking burner. 702) After the power and gas supply to the leaking burner are cut off, the control room notifies the controller of the heating furnace fire extinguishing unit to detect the flame in the leaking burner and activate the relevant image and video flame recognition device. If an open flame can still be detected in the leaking burner after the power and gas supply are cut off, the controller of the heating furnace fire extinguishing unit sends a signal to the main controller to activate the ignition device; 703) After receiving the signal to start the ignition device, the main controller controls the fuse electric ignition device to ignite the fire fuse. The burning fire fuse ignites the smoke fire extinguishing agent in the gas fire extinguishing medium generator. The gas fire extinguishing medium generator generates high pressure to cause smoke or gas to spray out. The high-pressure gas fire extinguishing medium sprayed from the gas fire extinguishing medium generator is input into the leaking fire tube through the main pipeline and branch pipeline to extinguish the flame caused by the oil leakage in the oil field heating furnace fire tube.

8. The gas fire extinguishing system according to claim 7, characterized in that: The electric control valve is normally open, and the heating furnace fire extinguishing unit includes a pressure sensor matched with the fire tube of the heating furnace. The pressure sensor of the heating furnace fire extinguishing unit is installed on the pipeline connecting the corresponding fire tube and the electric control valve. The pressure signal output end of the pressure sensor of the heating furnace fire extinguishing unit is connected to the pressure signal input end of the controller. The gas fire extinguishing system of the oilfield heating furnace includes the following steps when it is in operation: 801) After receiving the signal to activate the ignition device, the main controller first notifies the controllers of each heating furnace fire extinguishing unit to close all electronically controlled valves not related to this fire, leaving only the electronically controlled valve corresponding to the leaking fire tube open. The closed electronically controlled valves transmit the valve closing signal back to the main controller through the controllers of the heating furnace fire extinguishing unit. After receiving the closing signal from all electronically controlled valves not related to this fire, the main controller controls the fuse electric ignition device to ignite the fire fuse. 802) The pressure sensor in the main line senses the pressure of the high-pressure gas fire extinguishing medium and feeds back to the main controller a signal that the gas fire extinguishing medium generator has ignited and is outputting the high-pressure gas fire extinguishing medium. If the main controller does not receive the pressure signal fed back by the main line pressure sensor after activating the fire fuse electric heating igniter, the main controller activates the alarm signal; 803) The pressure sensor in the branch pipeline of the gas fire extinguishing medium transporting the leaking fire tube senses the pressure of the high-pressure gas fire extinguishing medium and feeds back the information that the high-pressure gas fire extinguishing medium has reached the fire tube to the controller of the heating furnace fire extinguishing unit. The controller of the heating furnace fire extinguishing unit then transmits the pressure signal of the high-pressure gas fire extinguishing medium arrival to the main controller to confirm that the fire extinguishing device is working normally. If the controller of the heating furnace fire extinguishing unit does not receive the corresponding gas fire extinguishing medium pressure signal and informs the main controller, the main controller activates the alarm signal to prevent the fire tube from leaking oil and getting out of control.

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