An aircraft cargo hold cooperative fire extinguishing system and method based on clean gas-liquid mixed medium

Abstract

The application provides a clean gas-liquid mixed medium-based aircraft cargo hold cooperative fire extinguishing system and method, and belongs to the technical field of aircraft fire safety. The fire extinguishing system comprises a fire extinguishing agent storage cabin, a high-temperature waste gas heating system, a fire extinguishing agent storage device, a mixing chamber, a fire extinguishing agent conveying pipeline, a double-fluid nozzle, a cabin environment pressure and temperature monitoring system, a total equipment power distribution unit and a cockpit fire extinguishing control unit. The fire extinguishing agent storage cabin is used for storing fire extinguishing agents, wherein the temperature of the storage cabin is regulated by the high-temperature waste gas heating system. The fire extinguishing agent storage device comprises a gas pressurized perfluorohexanone storage tank, a gas pressurized 2-BTP storage tank, a compressed nitrogen inert medium storage tank and a gas pressurized water storage tank. The release composition and proportion of the gas-liquid fire extinguishing agent can be regulated according to the cabin environment pressure and temperature. The application uses a clean chemical fire extinguishing agent, inert gas and fine water mist and other gas-liquid mixed medium cooperative fire extinguishing system to replace the traditional cargo hold halon fire extinguishing system to achieve efficient aircraft cargo hold fire extinguishing.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of aircraft manufacturing, and relates to an aircraft cargo compartment cooperative fire extinguishing system and method based on a clean gas-liquid mixed medium. BACKGROUND

[0002] According to CCAR 25.857 cargo compartment grade, clause C, a C-class cargo compartment of a civil transport aircraft needs to be equipped with a fixed fire extinguishing or suppression system approved and controllable from the cockpit. The halon cargo compartment fire extinguishing system using halon 1301 has been widely used in the field of civil aircraft. Halon 1301 is a gas chemical extinguishing agent, which mainly uses chemical suppression and has high extinguishing efficiency, but causes damage to the ozone layer. By 2040, the halon extinguishing agent needs to be completely stopped for use in the cargo compartment of a civil aircraft.

[0003] Seeking a halon replacement for a civil aircraft has become a current research frontier. The clean halon replacement agents that are currently more promising mainly include water-based (fine water mist), inert medium (nitrogen), and new high-boiling point gas chemical extinguishing agents such as perfluorohexanone and 2-BTP. Among them, the fine water mist and N2 mainly use physical cooling for extinguishing, are clean and environmentally friendly, have no ozone layer damage and greenhouse effect; 2-BTP and perfluorohexanone are liquid at room temperature, rapidly vaporize and absorb heat during extinguishing, and can interrupt the combustion chain reaction, mainly using chemical suppression, have high extinguishing efficiency, and have ODP potentials of 0.002 and 0, respectively, and GWP of 0.26 and 1, respectively, and basically no ozone damage and greenhouse effect.

[0004] In view of the above-mentioned clean halon replacement agent fire extinguishing system, the industry has developed a variety of fire extinguishing devices and systems, such as:

[0005] CN208660189U discloses a perfluorohexanone mixed type automatic fire extinguishing system. The fire extinguishing medium uses perfluorohexanone, and the fire extinguishing system can be freely combined and used in networking, and can be safely and reliably applied to cooling and fire extinguishing in large spaces or small spaces. However, the system and device are mainly applied to large spaces or small spaces of buildings, and do not involve a replacement scheme for the halon extinguishing agent of a civil aircraft cargo compartment.

[0006] CN112316350B discloses a water-based verification system platform applied to fire suppression of a large civil aircraft cargo compartment. The system includes a standard experimental cabin, a fine water mist generating device, and a control module. The fine water mist generating device is located in the standard experimental cabin and can accurately simulate the fine water mist suppression performance under various cargo compartment fire scenarios, but does not provide a connection and configuration relationship with an actual application scenario of an aircraft cargo compartment.

[0007] CN113616954A discloses an aircraft cargo compartment fine water mist fire extinguishing system and method, including one or more fire water sources, one or more fire gas sources, cargo compartment fire extinguishing pipelines, fire extinguishing system control devices, cockpit fire extinguishing control units. The fire extinguishing system uses pure fine water mist, which has relatively large water consumption and limited fire extinguishing efficiency. It still has great limitations in civil aircraft cargo compartment applications, and has not obtained civil aircraft cargo compartment fire extinguishing system airworthiness verification.

[0008] CN111589020A discloses a perfluorohexanone rapid fire extinguishing device and fire extinguishing system. The system includes a perfluorohexanone injection assembly, a CO2 generating device, a water mist generating device, a mixing chamber and a spray head. The invention uses perfluorohexanone, CO2 and water mist to achieve rapid fire extinguishing. It is mainly applied to building fire extinguishing systems and has not considered the internal environment and conditions of civil aircraft cargo compartments, and cannot be used as a civil aircraft cargo compartment halon replacement fire extinguishing system.

[0009] CN111991733A relates to a gas-liquid two-fluid mixed atomization fire extinguishing device and method. The device includes a fire extinguishing medium storage unit, a power output unit, a control unit, a delivery pipeline, an atomization unit and an operating parameter monitoring unit. The two-fluid fire extinguishing medium includes a high-boiling-point gas extinguishing agent and water, which is fully atomized after gas-liquid mixing to extinguish the fire. The invention has high fire extinguishing efficiency and is clean and environmentally friendly. However, it is mainly applied to confined spaces such as energy storage power stations and underground pipe corridors, and has not considered the actual civil aircraft cargo compartment environment and airworthiness requirements, and cannot be used as a civil aircraft cargo compartment halon replacement fire extinguishing system.

[0010] In summary, under the premise of ensuring fire extinguishing efficiency and clean environmental protection, a new halon replacement fire extinguishing system that meets the environmental conditions and airworthiness requirements of civil aircraft cargo compartments needs to be developed. A new halon replacement fire extinguishing system based on clean gas-liquid mixed medium can effectively reduce the amount of fire extinguishing agent and improve fire extinguishing efficiency, making it a possible solution for replacing halon in civil aircraft cargo compartments, and has important technical and economic value. SUMMARY

[0011] The purpose of the present application is to provide a cooperative fire extinguishing system and method for aircraft cargo compartments based on clean gas-liquid mixed medium. The system uses new high-boiling-point gas chemical fire extinguishing agents such as perfluorohexanone and 2-BTP, inert gas N2 and fine water mist to form clean gas-liquid mixed medium fire extinguishing agent. The composition and proportion of the mixed fire extinguishing medium can be adjusted according to the cargo compartment environmental pressure and temperature, achieving efficient fire extinguishing in different civil aircraft cruising environments, while minimizing the consumption of fire extinguishing agents, and making up for the limitations of traditional halon fire extinguishing systems or single medium fire extinguishing systems.

[0012] The purpose of the present application can be realized by the following technical solutions: a clean gas-liquid mixed medium-based aircraft cargo hold cooperative fire extinguishing system, comprising a fire extinguishing agent storage cabin, a high-temperature waste gas heating system, a gas pressurized perfluorohexanone storage tank, a gas pressurized 2-BTP storage tank, a compressed nitrogen inert medium storage tank, a gas pressurized water storage tank, a mixing chamber, a fire extinguishing agent delivery pipeline, a dual-fluid nozzle, a cabin environment pressure and temperature monitoring system, a total equipment power distribution unit and a cockpit fire extinguishing control unit;

[0013] The fire extinguishing agent storage cabin is used for storing the gas pressurized perfluorohexanone storage tank, the gas pressurized 2-BTP storage tank, the compressed nitrogen inert medium storage tank and the gas pressurized water storage tank.

[0014] The high-temperature waste gas heating system comprises high-temperature waste gas from an on-board engine and the like, a waste gas delivery pipeline and a fire extinguishing agent storage cabin temperature sensor; the high-temperature waste gas enters through an air inlet of the fire extinguishing agent storage cabin and is discharged through an air outlet; an electromagnetic valve and a mass flow controller are arranged on the waste gas delivery pipeline, so that the flow of the high-temperature waste gas can be regulated according to the temperature of the fire extinguishing agent storage cabin, thereby preventing the fire extinguishing agent from freezing and preventing the local temperature of the storage cabin from being too high.

[0015] Preferably, the top of each of the gas pressurized perfluorohexanone storage tank, the gas pressurized 2-BTP storage tank and the compressed nitrogen inert medium storage tank is respectively provided with a pressure relief valve and a pressure sensor.

[0016] Preferably, the top of the gas pressurized water storage tank is provided with a pressure relief valve and a pressure sensor, and an electromagnetic valve and a mass flow controller are arranged on the delivery pipeline connected to the dual-fluid nozzle.

[0017] Preferably, the gas fire extinguishing media, perfluorohexanone and 2-BTP, are both high-boiling-point gas fire extinguishing agents, but are not limited to the above two media; the nitrogen gas comes from an on-board gas inerting system; and the water comes from an on-board waste water system.

[0018] Preferably, the mixing chamber comprises three gas inlets, one chamber body, three shunt pipelines each having a plurality of gas holes on the periphery, and one gas outlet; the shunt pipelines are respectively connected to the gas fire extinguishing medium delivery pipelines; the gas fire extinguishing medium is injected into the mixing chamber through the gas holes of the shunt pipelines, fully mixed and then delivered to the dual-fluid nozzle through the gas outlet delivery pipeline; the mixing chamber has a shape of a combination of an upper half-sphere and a lower inverted round table, but is not limited to this structure; a warming device is arranged on the outside of the mixing chamber; and the warming device of the mixing chamber shell comprises a plurality of heating belts.

[0019] Preferably, the mixing chamber is connected to the gas inlet of the dual-fluid nozzle, the water tank is connected to the liquid inlet of the dual-fluid nozzle by a pipeline, the dual-fluid nozzle comprises a gas inlet, a liquid inlet and at least one outlet, and the dual-fluid nozzle is configured to spray the mixed fire extinguishing medium out of the outlet.

[0020] Preferably, the cabin environment pressure and temperature monitoring system comprises a temperature sensor and a pressure sensor, and the temperature sensor and the pressure sensor are electrically connected to the cockpit fire extinguishing control unit.

[0021] Preferably, the total equipment power distribution unit is controlled by the cockpit fire extinguishing control unit, and the total equipment power distribution unit is electrically connected to the pipeline electromagnetic valve, the mass flow controller, the pressure sensor and the temperature sensor.

[0022] Preferably, the fire extinguishing method comprises the following steps:

[0023] S1, the cockpit fire extinguishing control unit starts the fire extinguishing system according to the fire alarm signal, and determines the composition and proportion of the mixed fire extinguishing medium according to the cabin pressure and temperature, the total equipment power distribution unit receives the signal of the fire extinguishing control unit, starts the electromagnetic valve of the fire extinguishing agent storage device and the mass flow controller, and releases the mixed fire extinguishing medium with specific composition and proportion, wherein the composition of the fire extinguishing agent is controlled by the opening and closing of the pipeline electromagnetic valve, and the proportion of the fire extinguishing agent is controlled by the mass flow controller; S2, the equipment power distribution unit receives the signal of the fire extinguishing control unit, starts the pipeline electromagnetic valve, forms a fire extinguishing medium pipeline, and sends the gas-liquid fire extinguishing medium to the dual-fluid nozzle, the dual-fluid nozzle sprays the gas-liquid mixed fire extinguishing medium, and the dual-fluid nozzle can generate atomized particles with a particle size of less than or equal to 300 microns under a pressure of less than 0.6 MPa;

[0024] S3, the cockpit fire extinguishing control unit first sets a large flow to implement rapid fire extinguishing according to the mass flow controller of the fire extinguishing agent, and then sets a small flow to implement fire suppression when the temperature decreases to a safe range according to the temperature sensor data in the cabin.

[0025] 1. The civil aircraft cargo cabin cooperative fire extinguishing system based on clean gas-liquid mixed medium of the present application meets the latest environmental protection requirements of ICAO and EASA.

[0026] 2. The cargo cabin fire extinguishing system of the present application is composed of clean chemical fire extinguishing agent, inert gas and fine water mist to form a gas-liquid mixed fire extinguishing agent, fully utilizes the cooperative fire extinguishing effect between the mixed medium, significantly improves the fire extinguishing efficiency and maximally reduces the consumption of fire extinguishing agent.

[0027] 3、The cargo hold pressure and temperature monitoring system in the cargo hold fire extinguishing system of the present application can feed back the environmental pressure and temperature information under the cargo hold fire scene to the driver's cabin fire extinguishing control unit in real time; the driver's cabin fire extinguishing control unit can control the composition and proportion of the mixed fire extinguishing agent in real time through the pipeline electromagnetic valve and the mass flow controller according to the cargo hold environmental pressure and temperature, so as to realize the accurate control of the fire extinguishing agent injection amount and improve the utilization rate of the fire extinguishing agent. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is the structural schematic diagram of the civil aircraft cargo hold cooperative fire extinguishing system based on the clean gas-liquid mixed medium of the present application.

[0029] Figure 2 is the structural schematic diagram of the gas medium mixing cavity in the civil aircraft cargo hold cooperative fire extinguishing system based on the clean gas-liquid mixed medium of the present application.

[0030] Figure 3 is the operation flow schematic diagram of the fire extinguishing system of the present application. Figure 1

[0031] Legend: 1-fire extinguishing agent storage cabin, 2-high temperature waste gas heating system, 3-gas pressurized perfluorohexone storage tank, 4-gas pressurized 2-BTP storage tank, 5-compressed nitrogen inert medium storage tank, 6-gas pressurized water storage tank, 7-mixing cavity, 8-fire extinguishing agent conveying pipeline, 9-dual-fluid nozzle, 10-cargo hold environmental pressure and temperature monitoring system, 11-total equipment power distribution unit, 12-driver's cabin fire extinguishing control unit, 101-fire extinguishing agent storage cabin temperature sensor, 102-fire extinguishing agent storage cabin air inlet, 103-fire extinguishing agent storage cabin air outlet, 201-high temperature waste gas pipeline electromagnetic valve, 202-high temperature waste gas pipeline mass flow controller, 203-high temperature waste gas conveying pipeline, 301, 401, 501, 601-fire extinguishing agent storage device pressure relief valve, 302, 402, 502, 602-fire extinguishing agent storage device pressure sensor, 303, 403, 503, 603-fire extinguishing agent conveying management electromagnetic valve, 304, 404, 504, 604-fire extinguishing agent conveying pipeline mass flow controller, 701-mixing cavity shunt pipeline, 702-mixing cavity gas inlet, 703-mixing cavity gas outlet, 704-gas fire extinguishing agent conveying pipeline electromagnetic valve, 705-mixing cavity shunt pipeline gas hole, 706-heating device, 801-gas fire extinguishing agent conveying pipeline, 802-liquid fire extinguishing agent conveying pipeline, 901-dual-fluid nozzle air inlet, 902-dual-fluid nozzle liquid inlet, 903-dual-fluid nozzle outlet, 1001-cargo hold pressure sensor, 1002-cargo hold temperature sensor. DETAILED DESCRIPTION

[0032] ​The following is a specific embodiment of the present application and further describes the technical solutions of the present application in conjunction with the drawings, but the present application is not limited to these embodiments.

[0033] As shown in Figure 1 The present application provides a clean gas-liquid mixed medium-based civil aircraft cargo hold cooperative fire extinguishing system, which comprises a fire extinguishing agent storage cabin room 1, the fire extinguishing agent storage cabin room 1 is provided with a fire extinguishing agent storage cabin room temperature sensor 101 to monitor the ambient temperature of the fire extinguishing agent storage cabin room in real time; a high-temperature waste gas inlet 102 and a high-temperature waste gas outlet 103 to realize the input and output of high-temperature waste gas.

[0034] The present application comprises a high-temperature waste gas heating system 2, which comprises engine and other on-board equipment high-temperature waste gas and waste gas conveying pipeline 203; the waste gas conveying pipeline 203 is provided with a solenoid valve 201 and a flow controller 202, and the temperature information provided by the fire extinguishing agent storage cabin room temperature monitoring sensor 101 is used to control the flow of high-temperature waste gas through the flow controller 202 to prevent the freezing of fire extinguishing agent and the excessive local temperature of the storage cabin room.

[0035] The present application comprises a gas-pressurized perfluorohexanone storage tank 3, a gas-pressurized 2-BTP storage tank 4, a compressed nitrogen inert medium storage tank 5, and a gas-pressurized water storage tank 6, and the storage device comprises the gas-pressurized perfluorohexanone storage tank 3, the gas-pressurized 2-BTP storage tank 4, the compressed nitrogen inert medium storage tank 5, and the gas-pressurized water storage tank 6; the gas-pressurized perfluorohexanone storage tank 3, the gas-pressurized 2-BTP storage tank 4, the compressed nitrogen inert medium storage tank 5, and the gas-pressurized water storage tank 6 share a set of mechanical pressurizing device, and each storage tank is provided with a fire extinguishing agent storage device pressure relief valve and a fire extinguishing agent storage device pressure sensor; the pressure of each fire extinguishing agent storage tank is monitored in real time through the fire extinguishing agent storage device pressure sensor; the normal working pressure in the storage tank is P0, when the pressure P in the storage tank is less than P0, the storage tank is pressurized through the mechanical pressurizing device to ensure that the fire extinguishing agent can be smoothly discharged; when the pressure P in the storage tank is greater than P0, the storage tank is pressure released through the pressure relief valve 301-601 to prevent the damage of the storage tank caused by excessive internal pressure.

[0036] The fire extinguishing agent conveying pipeline at the outlet of the fire extinguishing agent storage device (gas-pressurized perfluorohexanone storage tank 3, gas-pressurized 2-BTP storage tank 4, compressed nitrogen inert medium storage tank 5, and gas-pressurized water storage tank 6) is provided with a fire extinguishing agent conveying pipeline solenoid valve and a fire extinguishing agent conveying pipeline mass flow controller. The fire extinguishing agent conveying pipeline solenoid valve is used to control whether the corresponding fire extinguishing agent is selected; and the fire extinguishing agent conveying pipeline mass flow controller is used to control the proportion of the corresponding fire extinguishing agent.

[0037] The application includes a mixing chamber 7, which includes three gas inlets 702, three shunt pipes 701 with multiple gas holes on the periphery, and a gas outlet 703. Perfluorohexone, 2-BTP and nitrogen are respectively introduced into the shunt pipes 701 through the three gas inlets 702, and are sprayed into the mixing chamber through the peripheral gas holes 705 of the shunt pipes 701 to be fully mixed; the mixed fire extinguishing medium is finally introduced into the gas fire extinguishing agent conveying pipe 801 through the gas outlet 703; the shell of the mixing chamber 7 of the application further includes a heating device (heating belt) 706 (at least one layer), which is used to increase the internal temperature of the chamber and improve the liquid-gas conversion rate of high-boiling-point gas fire extinguishing agent medium such as perfluorohexone and 2-BTP.

[0038] The application includes a gas fire extinguishing agent conveying pipe 801 and a liquid fire extinguishing agent conveying pipe 802; the two ends of the gas fire extinguishing agent conveying pipe are respectively connected with gas fire extinguishing agent storage devices (3, 4, 5) and a double-fluid nozzle gas inlet 901; the two ends of the liquid fire extinguishing agent conveying pipe are respectively connected with a liquid fire extinguishing agent storage device 6 and a double-fluid nozzle liquid inlet 902.

[0039] The application includes a double-fluid nozzle 9, which includes a gas inlet 901, a liquid inlet 902, and at least one outlet (903); water and mixed gas fire extinguishing medium are respectively introduced into the double-fluid nozzle 9 through the liquid inlet 902 and the gas inlet 901; the double-fluid nozzle can generate atomized particles with a particle size of less than or equal to 300 microns under a pressure of less than 0.6 MPa.

[0040] The application includes a cargo compartment environment pressure and temperature monitoring system 10, which includes a temperature sensor 1001 and a pressure sensor 1002, and can monitor the environment pressure and temperature data in the cargo compartment in real time when a fire occurs, and feed back to the cockpit fire extinguishing control unit 12, so that the cockpit fire extinguishing control unit 12 determines the appropriate composition and proportion of the fire extinguishing agent.

[0041] The application includes a total equipment power distribution unit 11, which is connected with the cockpit fire extinguishing control unit 12; the total equipment power distribution unit 11 includes equipment power distribution units of various devices, which are respectively connected with pipe electromagnetic valves, mass flow controllers, pressure sensors, temperature sensors and other devices.

[0042] The application also includes a cockpit fire extinguishing control unit 12, which can receive a fire alarm signal to start the fire extinguishing program, and determine the composition and proportion of the fire extinguishing agent in the mixed fire extinguishing medium according to the cargo compartment pressure and temperature information provided by the cargo compartment environment pressure and temperature monitoring system 10, so as to realize precise control of the fire extinguishing agent, and then send a fire extinguishing signal to the total power distribution unit 11; in addition, the cockpit fire extinguishing control unit 12 can control the injection amount of the fire extinguishing agent in stages according to the fire extinguishing agent mass flow controller, so as to realize large-flow injection for rapid fire extinguishing and temperature reduction in the initial stage, and small-flow injection for fire suppression when the temperature in the cabin is reduced to a safe range.

[0043] The following description will be made in conjunction with the accompanying drawings Figure 3 The operation process of the cargo compartment fire extinguishing system of the present application will be illustrated as follows:

[0044] When a fire occurs in the cargo compartment of the aircraft, the fire alarm system in the cargo compartment sends a fire signal to the cockpit fire extinguishing control unit 12, the pilot starts the cargo compartment fire extinguishing program, and the cockpit fire extinguishing control unit determines the composition and proportion of the fire extinguishing agent according to the cargo compartment pressure and temperature data provided by the cargo compartment environment pressure and temperature monitoring system 10, and controls the composition and proportion of the fire extinguishing agent released by the mixed fire extinguishing medium and the opening of the fire extinguishing agent delivery pipeline through the electromagnetic valves and mass flow controllers, and then performs the cargo compartment fire extinguishing operation.

[0045] The cargo compartment fire extinguishing system executes the cargo compartment fire extinguishing program, and transmits a fire extinguishing signal to the general equipment power distribution unit 11 through the cockpit fire extinguishing control unit 12, and the general equipment power distribution unit 11 starts the device controllers through the device power distribution units.

[0046] When the device controllers are started, the pipeline electromagnetic valve is opened, the electromagnetic valve and mass flow controller at the outlet of the fire extinguishing agent storage device are opened, the mixed chamber heating device 706 is started to raise the internal temperature of the mixed chamber, increase the liquid-gas conversion rate of the high-boiling-point gas fire extinguishing medium, and the gas and liquid fire extinguishing media are released from the fire extinguishing agent storage device according to the composition and mixing proportion; After the gas fire extinguishing medium is released, it is fully mixed and vaporized in the mixed chamber 7 into the gas fire extinguishing agent delivery pipeline 801, and finally reaches the gas inlet 901 of the dual-fluid nozzle, the liquid fire extinguishing medium enters the liquid inlet 902 of the dual-fluid nozzle through the liquid fire extinguishing agent delivery pipeline 802, the liquid fire extinguishing medium includes water, the high-boiling-point gas fire extinguishing medium includes perfluorohexanone and 2-BTP, but is not limited to the above two media, nitrogen gas comes from the on-board gas inerting system, and the water comes from the on-board waste water system, and then the gas-liquid fire extinguishing medium is atomized by the dual-fluid nozzle to form a mixed fire extinguishing agent with a specific composition and proportion, which is sprayed through the dual-fluid nozzle outlet 903 to the entire cargo compartment space, and the mixed medium is used to synergistically extinguish the fire, so as to achieve rapid extinguishing and suppression of the fire in the cargo compartment.

[0047] The contents not described in detail in the specification belong to the prior art known to those skilled in the art. The specific embodiments described herein are only illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

Claims

1. A collaborative fire suppression system for aircraft cargo holds based on a clean gas-liquid mixture, characterized in that, It includes a fire extinguishing agent storage compartment (1), a high-temperature exhaust gas heating system (2), a gas-pressurized perfluorohexanone storage tank (3), a gas-pressurized 2-BTP storage tank (4), a compressed nitrogen inert medium storage tank (5), a gas-pressurized water storage tank (6), a mixing chamber (7), a fire extinguishing agent delivery pipeline (8), a dual-fluid nozzle (9), an in-cabin environmental pressure and temperature monitoring system (10), a main equipment power distribution unit (11), and a driver's cab fire extinguishing control unit (12); The fire extinguishing agent storage chamber (1) is used to store a gas-pressurized perfluorohexanone storage tank (3), a gas-pressurized 2-BTP storage tank (4), a compressed nitrogen inert medium storage tank (5), and a gas-pressurized water storage tank (6). The gas-pressurized perfluorohexanone storage tank (3), the gas-pressurized 2-BTP storage tank (4), and the compressed nitrogen inert medium storage tank (5) are connected to the mixing chamber (7) through a gas extinguishing agent delivery pipeline (801). The high-temperature exhaust gas heating system (2) includes high-temperature exhaust gas from equipment such as the engine, exhaust gas delivery pipe (203), and a temperature sensor (101) for the extinguishing agent storage chamber. The high-temperature exhaust gas enters through the air inlet (102) of the extinguishing agent storage chamber and is discharged through the exhaust outlet (103). The exhaust gas delivery pipe (203) is equipped with an electromagnetic valve and a mass flow controller, which can regulate the flow rate of the high-temperature exhaust gas according to the temperature of the extinguishing agent storage chamber to prevent the extinguishing agent from freezing and the local temperature of the storage chamber from becoming too high. The mixing chamber (7) includes three gas inlets (702), a cavity, three diversion pipes (701) with multiple air holes around the perimeter, and a gas outlet (703). The diversion pipes (701) are respectively connected to the gas extinguishing medium delivery pipes. The gas extinguishing medium is injected into the mixing chamber (7) through the air holes (705) of the diversion pipes. After being fully mixed, it reaches the air inlet (901) of the dual-fluid nozzle through the gas outlet (703) delivery pipe. The shape of the mixing chamber (7) is a combination of an upper hemisphere and a lower inverted frustum, but it is not limited to this structure. A heating device (706) is installed on the outside of the mixing chamber (7). The heating device (706) of the outer shell of the mixing chamber (7) includes multiple layers of heating belts. The main equipment power distribution unit (11) is controlled by the fire extinguishing control unit (12) in the driver's cab. The main equipment power distribution unit (11) is electrically connected to the pipeline solenoid valve, mass flow controller, pressure sensor and temperature sensor.

2. The aircraft cargo hold collaborative fire suppression system based on a clean gas-liquid mixture as described in claim 1, characterized in that, The tops of the gas-pressurized perfluorohexanone storage tank (3), the gas-pressurized 2-BTP storage tank (4), and the compressed nitrogen inert medium storage tank (5) are respectively equipped with pressure relief valves and pressure sensors.

3. The aircraft cargo hold collaborative fire suppression system based on a clean gas-liquid mixture as described in claim 1, characterized in that, The top of the gas-pressurized water storage tank (6) is equipped with a pressure relief valve and a pressure sensor, and the delivery pipeline connected to the dual-fluid nozzle (9) is equipped with an electromagnetic valve and a mass flow controller.

4. A collaborative fire suppression system for aircraft cargo holds based on a clean gas-liquid mixture as described in any one of claims 2 and 3, characterized in that, The gaseous fire extinguishing media—perfluorohexanone and 2-BTP—are both high-boiling-point gaseous fire extinguishing agents, but are not limited to these two media. The nitrogen comes from the airborne gas inerting system, and the water comes from the aircraft wastewater system.

5. A collaborative fire suppression system for aircraft cargo holds based on a clean gas-liquid mixture as described in claim 4, characterized in that, The mixing chamber (7) is connected to the air inlet (901) at the end of the dual-fluid nozzle (9), and the gas-pressurized water storage tank (6) is connected to the liquid inlet (902) at the end of the dual-fluid nozzle (9) through the pipe (802). The dual-fluid nozzle (9) includes an air inlet (901), a liquid inlet (902) and at least one outlet (903), and a mixed fire extinguishing medium is sprayed out at the outlet (903) of the dual-fluid nozzle.

6. The aircraft cargo hold collaborative fire suppression system based on a clean gas-liquid mixture as described in claim 1, characterized in that, The cabin environment pressure and temperature monitoring system (10) includes a temperature sensor (1001) and a pressure sensor, and both the temperature sensor (1001) and the pressure sensor are electrically connected to the fire extinguishing control unit (12) in the driver's cab.

7. A method for coordinated fire suppression in the cargo hold of a civil aircraft based on a clean gas-liquid mixture, employing the fire suppression system described in claim 1, characterized in that, Firefighting methods include the following steps: S1. The fire extinguishing control unit (12) in the cab starts the fire extinguishing system according to the fire alarm signal, and determines the composition and proportion of the mixed fire extinguishing medium according to the pressure and temperature inside the cabin. The main equipment power distribution unit (11) receives the signal from the fire extinguishing control unit, starts the solenoid valve and mass flow controller of the fire extinguishing agent storage device, and releases the mixed fire extinguishing medium with a specific composition and proportion. The composition of the fire extinguishing agent is controlled by the opening and closing of the pipeline solenoid valve, and the proportion of the fire extinguishing agent is controlled by the mass flow controller. S2. The power distribution unit (11) of the equipment receives the signal from the fire extinguishing control unit and starts the electromagnetic valve of the delivery pipeline to form a fire extinguishing medium delivery pipeline passage to transfer the gas-liquid mixed fire extinguishing medium to the dual fluid nozzle (9). The dual fluid nozzle sprays out the gas-liquid mixed fire extinguishing medium. The dual fluid nozzle (9) can generate atomized particles with a particle size of less than or equal to 300 micrometers at a pressure of less than 0.6MPa. S3. The fire extinguishing control unit (12) in the driver's cab first sets a large flow rate to quickly extinguish the fire according to the fire extinguishing agent mass flow controller, and then sets a small flow rate to suppress the fire when the temperature drops to a safe range according to the data from the cabin temperature sensor.

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