CN115970208A - Fire extinguishing method for elevating jet fire truck - Google Patents

Abstract

The invention discloses a fire extinguishing method of a lifting jet fire truck, relates to the technical field of fire extinguishing, and aims to improve the diversity of fire extinguishing schemes. The method comprises the following steps: determining fire extinguishing medium sprayed by the elevating jet fire truck according to the type of the fire; the fire extinguishing medium comprises at least one of the following: water, foam concentrate, compressed air foam-foam concentrate; and determining the communication state of a first fire extinguishing spray flow path of the elevating spray fire truck according to the fire extinguishing medium sprayed by the elevating spray fire truck. Above-mentioned technical scheme, when putting out a fire, according to the conflagration scene of difference, to the fire suppression of the combustion area of not co-altitude, different distance and the cooling of the combustion tank body, adjacent jar of body, can satisfy the fire extinguishing medium and the cooling water that spray different flow, different grade type, different combination to adapt to the demand of putting out a fire and cooling demand.

Description

Fire extinguishing method for elevating jet fire truck

Technical Field

The invention relates to the technical field of fire fighting, in particular to a fire extinguishing method of a lifting jet fire engine.

Background

Petrochemical fire has complex fire conditions, often accompanies explosion, has various combustion forms such as three-dimensional, large-area, multi-fire-point, after-combustion, after-explosion and the like, and often causes disastrous casualties and huge economic loss. Taking a fixed-roof storage tank fire as an example, the fixed-roof storage tank fire is a torch fire which burns oil vapor from a breather valve, an oil metering hole and the like on the top of the tank body, a flowing fire and an oil pool fire which are formed by the damage of seals such as an inspection manhole flange and the like, a semi-open and collapse type combustion which is formed by deflagration when an oil-gas mixture in the tank reaches an explosion limit, and even a full-hydraulic combustion scene of the tank body.

The existing fire extinguishing spraying systems of the elevating spraying fire truck have the following types: (1) the lower car is provided with a foam liquid mixing device, so that water spraying or air suction foaming at a gun mouth can be realized, and foam extinguishment with different foaming times of low multiple/medium multiple/high multiple is formed. (2) The lower car is provided with a foam liquid mixing and gas injection foaming device, and water spraying or positive pressure foam injection with different foaming times can be realized. (3) A foam liquid mixing device is arranged at the position of a vehicle or a fire monitor, and water can be sprayed or mixed liquid can be sprayed to impact air to foam and extinguish fire in the air. (4) The lower car is provided with a foam liquid mixing device and a dry powder fluidizing device, and the gas-solid two-phase flow carried by the liquid extinguishing medium is sprayed and extinguished through the three-phase jet gun. The four types are all designed by a special technology aiming at the existing specific fire scene, so that the high-efficiency fire extinguishing is realized.

The inventor finds that the existing fire extinguishing spraying system has single function and method during fire extinguishing, cannot set different fire extinguishing spraying schemes for different types and scenes of fires, and has low fire extinguishing efficiency, so that the extinguishing efficiency of petrochemical fires is seriously influenced.

Disclosure of Invention

The invention provides a fire extinguishing method of a high-lift jet fire truck, which is used for improving the diversity of fire extinguishing schemes and realizing the purpose of setting different fire extinguishing strategies and jet flow parameters according to different types and scenes of fires.

The embodiment of the invention provides a fire extinguishing method for a lifting jet fire engine, which comprises the following steps:

determining fire extinguishing medium and a spraying mode sprayed by a high-lift spraying fire truck according to the type and the scene of the fire; the fire extinguishing medium comprises at least one of the following: water, foam concentrate, compressed air foam-foam concentrate;

determining the communication state of a first fire extinguishing spray flow path of the elevating spray fire truck according to the fire extinguishing medium sprayed by the elevating spray fire truck and the spray mode;

and adjusting the pressure and/or flow of the first fire extinguishing spraying flow path to meet the jet performance requirements of various working conditions so as to extinguish fire.

In some embodiments, the injection pattern comprises, in some embodiments:

selecting one of the first gun barrel and the second gun barrel for spraying;

the first gun barrel and the second gun barrel are sprayed simultaneously, and the fire extinguishing mediums sprayed by the first gun barrel and the second gun barrel are of the same type;

the first gun barrel and the second gun barrel are sprayed simultaneously, and the types of fire extinguishing media sprayed by the first gun barrel and the second gun barrel are different.

In some embodiments, when the fire extinguishing medium sprayed is water or foam concentrate, the flow rate of the spray of the elevated jet fire engine is set to one of: 120L/s or less, 150L/s or less, and 200L/s or less.

In some embodiments, when the injected extinguishing medium is compressed air foam, the injection flow rate of the elevated jet fire engine is set to: the injection flow rate of the foam liquid is 60L/s, and the gas-liquid ratio is 5 times.

In some embodiments, when the injected fire-extinguishing medium is compressed air foam-foam concentrate, the injection flow rate of the high-lift fire truck is set to: the 120L/s foam concentrate carried 60L/s by 6 times the compressed air foam jet.

In some embodiments, when the injected extinguishing medium is water, the fire monitor of the elevated jet fire engine is configured to operate in one of the following modes: the water spraying device comprises a fire monitor, a first gun tube of the fire monitor sprays water, a second gun tube of the fire monitor sprays water, and the first gun tube and the second gun tube of the fire monitor spray water.

In some embodiments, when the injected fire-extinguishing medium is foam concentrate, the fire monitor of the elevated jet fire engine is configured to operate in one of the following modes: the foam liquid is sprayed on the first gun tube of the fire monitor, the foam liquid is sprayed on the second gun tube of the fire monitor, and the foam liquid is sprayed on the first gun tube and the second gun tube of the fire monitor.

In some embodiments, when the injected extinguishing medium is compressed air foam, the fire monitor of the elevated jet fire engine is configured to operate in the following modes: compressed air foam is sprayed to a first gun tube of the fire monitor, and a second gun tube of the fire monitor is in a non-spraying state.

In some embodiments, when the injected fire-extinguishing medium is compressed air foam-foam concentrate, the fire monitor of the elevated jet fire engine is configured to operate in the following modes of operation: the first gun tube of the fire monitor sprays compressed air foam, and the second gun tube sprays foam liquid.

In some embodiments, the elevated jet fire engine comprises:

a fire extinguishing spray system configured to spray an extinguishing medium;

the second fire extinguishing spraying flow path of the fire extinguishing spraying system is arranged on the lower vehicle; and

and the upper vehicle is rotatably arranged on the lower vehicle, and a first fire extinguishing spraying flow path of the fire extinguishing spraying system is arranged on the upper vehicle.

In some embodiments, the fire suppression spray system comprises:

the first fire extinguishing jet flow path comprises a first liquid conveying pipeline, a second liquid conveying pipeline and a gas conveying pipeline;

the fire-fighting foam foaming device is in fluid communication with the first liquid conveying pipeline and the gas conveying pipeline and is positioned at the downstream of the first liquid conveying pipeline and the gas conveying pipeline; and

the fire monitor, the first gun pipe of fire monitor with fire control foam foaming device fluid intercommunication, the second gun pipe of fire monitor with second infusion pipeline fluid intercommunication, the fire monitor is located first infusion pipeline the second infusion pipeline with the low reaches of gas transmission pipeline.

In some embodiments, the fire suppression spray system further comprises a second fire suppression spray flow path comprising:

the foam liquid mixer is positioned at the upstream of the first infusion pipeline and the second infusion pipeline and is in fluid communication with the first infusion pipeline and the second infusion pipeline;

a foam raw liquid supply passage located upstream of the foam liquid mixer;

a water supply flow path switchably in fluid communication with the mixing chamber of the foam liquid mixer, the first fire suppression spray flow path; and

a gas supply flow path upstream of the fire fighting foam foaming device and in fluid communication with the fire fighting foam foaming device.

In some embodiments, the diameter of the gas supply flow path is configured such that the flow rate is < 20m/s.

In some embodiments, the diameter of the conduit between the foam liquid mixer and the first fire suppression spray flow path is configured such that the flow rate is < 10m/s.

In some embodiments, the fire fighting foam foaming device is configured such that a foam liquid injection flow rate is < 6m/s, a compressed air injection flow rate is 5-10 m/s, and a foam flow rate at an outlet of the fire fighting foam foaming device is < 10m/s.

In some embodiments, the diameters of the first and second infusion lines are configured such that the flow rate < 12m/s.

In some embodiments, the first fire suppression spray flow path further comprises:

the first flow control valve is arranged on the first liquid conveying pipeline so as to adjust the flow of the first liquid conveying pipeline; and/or the presence of a gas in the gas,

and the second flow control valve is arranged on the second infusion pipeline so as to adjust the flow of the second infusion pipeline.

According to the fire extinguishing method of the elevating jet fire truck, when fire is extinguished, fire extinguishing and cooling of the combustion tank body and the adjacent tank body in combustion areas with different heights and distances can be achieved according to different fire scenes, fire extinguishing media and cooling water with different flow rates, different types and different combinations can be sprayed without replacing a sprayer, so that fire extinguishing requirements and cooling requirements can be met, and the problem that positive pressure type foam jet remote fire extinguishing is easy to disperse is solved; and can realize large-traffic injection, little flow injection, the control logic of combination efflux under the multiplex condition to make the pertinence of fire extinguishing strategy stronger, fire extinguishing effect is better.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

fig. 1 is a schematic structural diagram of a fire monitor according to an embodiment of the present invention.

Fig. 2 is a schematic cross-sectional structural view of a fire monitor provided in an embodiment of the invention.

Fig. 3 isbase:Sub>A schematic sectional view of the structurebase:Sub>A-base:Sub>A of fig. 2.

Fig. 4 is a schematic sectional structure view of B-B of fig. 2.

Fig. 5 is a schematic structural diagram of a fire extinguishing spraying system provided by an embodiment of the invention.

Fig. 6 is a schematic flow chart of a fire extinguishing method of the elevated jet fire engine according to the embodiment of the invention.

Reference numerals:

100. a fire fighting foam foaming device; 200. a gas supply flow path; 300. a foam raw liquid supply flow path; 400. a water supply flow path; 500. a water spray branch; 600. spraying a foam branch; 700. a fire monitor; 810. a revolving body; 820. a controller; 900. a first fire suppression spray flow path; 1000. a second fire extinguishing spray flow path;

201. an air compressor; 202. a gas distribution valve; 203. a cooler; 204. a first gas filter; 205. a second gas filter; 206. an air flow meter; 207. a one-way valve; 208. a first pressure gauge; 209. an intake throttle valve;

301. a foam liquid pump; 302. a foam concentrate tank; 303. a foam stock solution suction valve; 304. a check valve; 305. a foam concentrate flow meter; 306. a foam stock solution switch valve; 307. flushing the water inlet valve; 308. a breather valve of the foam stock solution tank; 309. a foam raw liquid tank liquid inlet/outlet ball valve;

401. a water pump; 402. a vacuum pump; 403. a water tank; 404. a check valve; 405. a vacuum gauge; 406. a water flow meter; 407. a water suction ball valve; 408. an overflow pipe of the water tank; 409. a water tank water inlet ball valve;

501. a first switching valve;

601. a second switching valve; 602. a second pressure gauge; 603. a first flow control valve; 604. a second flow control valve; 605. a foam liquid mixer; 606. a third pressure sensor; 607. a fourth pressure sensor; 608. a fifth pressure measuring sensor; 609 a sixth pressure sensor; 610 a second flow meter;

701. a barrel assembly; 702. a gun barrel assembly;

7021. a connecting seat; 7022. a second barrel; 7023. a first barrel; 7024. a flow guide pipe; 7025. a first baffle; 7026. a second baffle; 70221. a gun body round tube; 70222. a nozzle cone; 70223. a nozzle straight pipe;

820. a controller;

901. a first infusion line; 902. a second infusion pipeline; 903. a gas transmission pipeline.

Detailed Description

The technical solution provided by the present invention is explained in more detail with reference to fig. 1 to 5.

Nouns or terminology used herein is to be interpreted.

The fire-fighting foam is a bubble group which has small volume and is surrounded by a liquid film on the surface and is used for fire fighting. Because the specific gravity is far less than that of the general combustible liquid, the liquid can float on the surface of the liquid to form a foam covering layer. Meanwhile, the foam has certain viscosity and can be adhered to the surface of a general combustible solid. The preparation of fire-fighting foam is generally that foam stock solution and water are uniformly mixed according to a certain proportion, and then the foam mixed solution is mixed with gas for foaming, and finally the fire-fighting medium with the fire-fighting effect is formed. The foam quality and fire extinguishing performance of the fire-fighting foam are mainly related to the physical properties of foam stock solution, water and gas, the foam mixed solution proportion, the gas-liquid ratio, the mixing pressure, the gas-liquid mixing uniformity, the gas-liquid two-phase surface contact area and other factors.

Foam liquid: can be mixed with water in a proper mixing ratio to form a concentrated liquid of the foaming solution.

Foam mixed liquid: the foam solution is prepared by mixing the foam solution and water according to a specific mixing ratio.

Expansion ratio: the ratio of the volume of foam to the volume of foam mixture that forms the foam. The low expansion foam is fire extinguishing foam with expansion ratio lower than 20; wet foam is foam with a foaming multiple of less than 10 times; the dry foam is a foam having a foaming ratio of not less than 10 times.

Compressed air foam fire engine: comprises a water tank, a foam raw liquid tank and a fire fighting truck which sprays foam to extinguish fire through a compressed air foam system.

Foam proportion mixing system: the system consists of a foam proportion mixer, a foam liquid pump, a control device, a pipeline device and the like, and can mix water and foam liquid according to a certain proportion. In the examples hereinafter, the foam proportioning system is located below the vehicle.

Compressed air foam system: the device mainly comprises a fire pump, a compressed air system, a foam proportion mixing system, an injection device, a pipeline system and the like, and can generate compressed air foam. In the following embodiment, the fire fighting foam foaming device 100 of the compressed air foam system is located on the boarding car.

Referring to fig. 1 and 2, an embodiment of the invention provides a fire monitor 700, which includes a barrel assembly 701 and a barrel assembly 702. The barrel assembly 702 includes a first barrel 7023 and a second barrel 7022. The first gun barrel 7023 is sleeved inside the second gun barrel 7022; the second barrel 7022 is mounted to the barrel assembly 701; wherein the sizes of the ejection ports of the first barrel 7023 and the second barrel 7022 satisfy the following relationship: the flow rate of the foam liquid sprayed by the second gun barrel 7022 is 1.5 to 2.5 times of the flow rate of the foam liquid contained in the compressed air foam sprayed by the first gun barrel 7023.

The barrel assembly 701 includes a pitching mechanism (not shown), a slewing mechanism (not shown), and the like, and the barrel assembly 701 is the same as the conventional universal fire monitor 700 and will not be described in detail herein. The barrel assembly 702 is mounted on the barrel assembly 701 by a threaded connection. The body assembly 701 adopts a universal 150L/s electric control fire monitor 700 body, and the diameter of an inlet is more than or equal to 130mm.

In some embodiments, the barrel assembly 702 further includes a connecting base 7021, and the connecting base 7021 is welded to the first barrel 7023, the second barrel 7022, and a first baffle 7025 and a second baffle 7026, which are described below. The barrel assembly 702 is threadedly mounted to the barrel assembly 701 by a coupling block 7021.

Diameter D of the first barrel 7023 ₁ The following functional relationship is satisfied:

Q _yp ＝Q _py ×(1+n×0.1/(P _yp + 0.2)) formula (2)

In the above-mentioned formula (1) and formula (2), D ₁ Is the diameter of the first barrel 7023 in m. Q _yp Is the flow of compressed air foam through the first barrel 7023 in m ³ /s。Q _py Is the flow rate of the foam concentrate through the first barrel 7023 in m ³ And s. n is the ratio of foam to liquid flowing through the first barrel 7023. P is _yp Is the pressure of the compressed air foam flowing through the first barrel 7023 in MPa. V _yp Is the flow rate of the compressed air foam flowing through the first barrel 7023 in m/s. In some embodiments, n is 4 to 6.

Wall thickness δ of the first barrel 7023 ₁ About 3mm. Diameter D of the first barrel 7023 ₁ Adopt above-mentioned functional relation to design, the value is about 80mm for first gun barrel 7023 operating pressure can not be too high, can not be too big broken because of the foam pressure variation after spraying the release from the big gun muzzle, has effectively guaranteed foam performance and range, and can make outer foam liquid wrap up in and hold inside compressed air foam injection better, realizes that long range, foaming are good when finally falling to the ground, the foam spouts the distal end more concentrated.

The pressure of the compressed air foam in the first gun barrel 7023 is recommended to be 0.4-0.6 MPa, and the flow rate of the compressed air foam should be controlled to be 18-22 m/s, so that the compressed air foam sprayed by the first gun barrel 7023 has good foaming multiple, stability and range.

Referring to fig. 2, in some embodiments, the second barrel 7022 comprises a barrel 70221, a nozzle cone 70222, and a nozzle straight 70223. One end of the barrel 70221 is mounted to the barrel assembly 701. A nozzle cone 70222 is affixed to the other end of the barrel 70221 and is in fluid communication with the barrel 70221. The straight nozzle tube 70223 is secured to the end of the conical nozzle tube 70222 remote from the barrel 70221 and is in fluid communication with the conical nozzle tube 70222.

In some embodiments, the diameter D of the nozzle straight tube 70223 ₀ The following functional relationship is satisfied:

in the above-described formula (3) and formula (4): d ₀ Is the diameter of the straight nozzle pipe 70223 in m. D _E Is as followsThe equivalent jet orifice diameter of the two barrels 7022, in m, is calculated from the diameter parameters of the second barrel 7022. Delta ₁ Is the wall thickness of the first barrel 7023 in m. Q _py Is the flow rate of the foam concentrate flowing through the second cannon pipe 7022 in m ³ /s。P _py Is the pressure of the foam concentrate flowing through the second barrel 7022 in MPa. C is the flow velocity coefficient of the nozzle straight tube 70223 of the second barrel 7022. g is the gravity acceleration and takes a value of 9.81m/s ² . In some embodiments, C is 0.92 to 0.95.

In some embodiments, the diameter D of the barrel 70221 ₃ The following functional relationship is satisfied:

D ₂ ＝D ₀ +L ₄ * tan theta equation (5)

In the above formula (5), L ₄ Is the nozzle cone 70222 length in m. Theta is the nozzle cone 70222 convergent angle. In some embodiments, θ is from 5 ° to 8 °.

In some embodiments, the barrel 70221 has a length that is the through-flow equivalent circular cross-sectional diameter D of the second barrel 7022 _E And 8 to 10 times of the total amount of the component (A), specifically, for example, an integral multiple of 8 times, 9 times, 10 times, or the like.

δ ₂ The wall thickness of the second barrel 7022, which is set as needed.

In some embodiments, the nozzle straight tube 70223 has a length that is the through-flow equivalent circular cross-sectional diameter D of the second barrel 7022 _E 0.7 to 0.8 times, for example 0.75.

Through the reasonable optimization design of the size of the second gun barrel 7022, the average flow velocity in the gun body round tube 70221 is 14-16 m/s, and the average flow velocity in the nozzle straight tube 70223 is 32-40 m/s.

Referring to fig. 2, the second gun barrel 7022 is formed by three-section welding of a gun body round tube 70221, a nozzle taper tube 70222 and a nozzle straight tube 70223. In order to enable the outer layer foam liquid to better wrap the compressed air foam in the gun body for spraying, realize long range, good foaming and more concentrated foam spraying far end when finally landing, the round pipe 70221 drift diameter D of the gun body ₂ Calculating the drift diameter D of a 130mm nozzle straight pipe 70223 according to the formula ₀ 105mm is calculated according to the formula. Spraying nozzleLength L of straight mouth tube 70223 ₅ Calculating the length L of the 50mm nozzle taper pipe 70222 according to the formula ₄ Calculating the length L of the round tube 70221 of the gun body of 450mm according to the formula ₀ Calculated according to the formula above, is about 800mm. Extension length L of water cannon ₁ ＝L ₀ +L ₄ +L ₅ ＝1300mm。

According to the technical scheme, through reasonably setting the structures of the first gun barrel 7023 and the second gun barrel 7022 and the communication relation of two paths of spraying media, and matching with the starting of pumps corresponding to different flow paths and the logic control of related switching valves, distribution valves and flow control valves, multiple spraying fire extinguishing functions of independently spraying the first gun barrel, independently spraying the second gun barrel, jointly spraying the first gun barrel and the second gun barrel and the like are realized, and the sprayed media can be any one of water, foam concentrate, compressed air foam and compressed air foam-foam concentrate.

Referring to fig. 2-4, in some embodiments, the barrel assembly 702 further comprises a first deflector 7025, the first deflector 7025 being mounted in a gap between the first barrel 7023 and the second barrel 7022; the length of the first baffle 7025 is 250mm to 400mm.

In order to reduce the hydraulic loss and the outlet turbulence kinetic energy of the second gun barrel 7022 and improve the spraying performance of the fire-fighting liquid, 8 first guide plates 7025 are uniformly and circumferentially welded between the second gun barrel 7022 and the first gun barrel 7023 to serve as flow deflectors, the length of each first guide plate 7025 is about 350mm, and the blade thickness T of each first guide plate 7025 is equal to the blade thickness T of each first guide plate 7025 ₁ ＝2mm。

In some embodiments, the number of the first deflectors 7025 is 8 to 10, and the respective first deflectors 7025 are evenly arranged along the circumference of the first barrel 7023.

Referring to fig. 2, in some embodiments, the barrel assembly 702 further comprises a flow conduit 7024 and a second flow deflector 7026. The draft tube 7024 is mounted inside the first barrel 7023; a second deflector 7026 is disposed in the gap between the draft tube 7024 and the first barrel 7023.

In some embodiments, the diameter D of the delivery tube 7024 ₃ Is the diameter D of the first barrel 7023 ₁ 0.35 to 0.5 times of that of (1), about 30mm. Of flow-guide tubes 7024Wall thickness of delta ₃ ＝1.5mm。

The length of the flow guide tube 7024 is 200mm to 350mm, specifically, 200mm, 250mm, 300mm, or 350mm.

Referring to fig. 3 or 4, the number of the second baffles 7026 is, for example, 6 to 8. The first and second flow deflectors 7025, 7026 are offset from each other in the circumferential direction of the first barrel 7023. Blade thickness T of the second baffle 7026 ₂ ＝1mm。

The diversion pipe 7024 and the second diversion plate 7026 adopt the above parameters, so that the hydraulic loss and the outlet turbulence kinetic energy of the first gun barrel 7023 are effectively reduced, and the spraying performance of the fire monitor 700 when spraying compressed air foam is improved.

According to the fire monitor 700 provided by the technical scheme, the sections of the first monitor tube 7023 and the second monitor tube 7022 and the respective flow guide plates (tubes) are reasonably designed, so that the remote shooting with three flows can be realized when water or foam mixed liquid is sprayed; can realize carrying the inside compressed air foam injection of wrapping up with the foam mixed liquid in the skin when spraying compressed air foam, compare current solitary compressed air foam injection, not only the range is far away, and the efflux is long-range also not diverged moreover, and is very concentrated. According to the technical scheme, under the condition that the type of the fire monitor is not required to be replaced, the high-efficiency fire fighting applicability of the elevating jet fire truck to close-range pool fire/flowing fire and long-distance tank fire is improved, and the applicability to different fire extinguishing or cooling objects and different operation flow requirements is met.

Referring to fig. 5, an embodiment of the present invention further provides a fire extinguishing spraying system, which includes a first fire extinguishing spraying flow path 900, a fire fighting foam foaming device 100, and a fire monitor 700 according to any one of the technical solutions of the present invention. The first fire extinguishing spray flow path 900 is located on the boarding, also referred to as boarding spray flow path, and includes a first liquid conveying pipe 901, a second liquid conveying pipe 902, and a gas conveying pipe 903. The fire-fighting foam foaming device 100 is in fluid communication with the first infusion pipeline 901 and the air pipeline 903 in a uniform manner, and is located at the downstream of the first infusion pipeline 901 and the air pipeline 903. The first gun tube 7023 of the fire monitor 700 is in fluid communication with the fire foam foaming device 100, the second gun tube 7022 of the fire monitor 700 is in fluid communication with the second fluid delivery line 902, and the fire monitor 700 is located downstream of the first fluid delivery line 901, the second fluid delivery line 902, and the gas delivery line 903. The fire fighting foam foaming device 100 is configured to achieve mixed foaming of foam concentrate and compressed air and then supply the first barrel 7023 of the fire fighting gun 700. The fire fighting foam foaming device 100, a gas supply flow path 200 described later, and the like are components of a compressed air foam system.

The body of the elevating jet fire truck can be divided into an upper truck part and a lower truck part by taking the slewing bearing and the central revolving body 810 as boundaries. The lower vehicle comprises a chassis, a frame and leg device, a rotary support fixing part, a central rotary body 810 fixing part and the like. The upper vehicle comprises a turntable assembly, a lifting arm support (or ladder frame) assembly and the like. When the lifting operation is carried out, the lower car is kept still, and the upper car can carry out rotary spraying fire extinguishing according to the operation direction. Wherein a second fire extinguishing spray flow path 1000 described later is located at the lower vehicle.

The upper vehicle is provided with two infusion pipelines, namely a first infusion pipeline 901 and a second infusion pipeline 902. The first liquid conveying pipeline 901 and the second liquid conveying pipeline 902 are independent and are arranged in parallel. The first liquid conveying pipeline 901 is used for conveying fluid to a first gun barrel 7023 of the fire monitor 700, and the second liquid conveying pipeline 902 is used for conveying fluid to a second gun barrel 7022 of the fire monitor 700. The upper vehicle is also provided with an air transmission pipeline 903. The first infusion pipeline 901 is provided with a fire-fighting foam foaming device 100, and the fire-fighting foam foaming device 100 is also located on the upper vehicle. The fire fighting foam foaming device 100 has two inlets and one outlet. One of the inlets is in fluid communication with the first infusion line 901 and the other inlet is in fluid communication with the gas line 903. The fluid conveyed to the fire-fighting foam foaming device 100 by the first liquid conveying pipeline 901 and the compressed gas conveyed to the fire-fighting foam foaming device 100 by the gas conveying pipeline 903 are foamed together to obtain the required fire extinguishing medium.

With continued reference to FIG. 5, first fluid line 901 is in fluid communication with a first barrel 7023 of fire monitor 700. First infusion pipeline 901 still installs first flow control valve and second flowmeter, can control the flow in the first infusion pipeline 901 through first flow control valve, can accurately calculate the interior flow of first infusion pipeline 901 through the second flowmeter, and then make the fluidic volume that enters into fire control foam foaming device 100 satisfy the foaming requirement to obtain the fire-fighting medium of required performance.

With continued reference to FIG. 5, a fourth pressure sensor 607 is further installed on the first fluid line 901 to detect the fluid pressure in the first fluid line 901.

With continued reference to fig. 5, a one-way valve 207 is provided on the air pipe 903, and the flow direction of the compressed air in the air pipe 903 is controlled by the one-way valve 207, so that the air can enter the fire fighting foam foaming device 100 from the air pipe 903 without flowing back.

The check valve 207 is located downstream of the fourth pressure sensor 607 so that the detection of the air pressure of the fluid entering the fire fighting foam foaming device 100 can be achieved. In some embodiments, a fifth pressure sensor 608 is further provided downstream of the one-way valve, and the fifth pressure sensor 608 is used to detect the pressure of the fluid output from the fire fighting foam foaming device 100 so as to accurately control the pressure of the fluid entering the first barrel 7023 of the fire monitor 700.

With continued reference to FIG. 5, second fluid delivery line 902 is in fluid communication with second barrel 7022 of fire monitor 700.

In some embodiments, first suppression spray flow path 900 further includes first flow control valve 603 and/or second flow control valve 604. The first flow control valve 603 is installed in the first liquid conveying pipeline 901 to adjust the flow of the first liquid conveying pipeline 901. A second flow control valve 604 is mounted to the second fluid line 902 to regulate the flow of the second fluid line 902.

The first flow control valve 603 and the second flow control valve 604 are controlled in a coordinated manner, so that the flow ratio in the first liquid conveying pipeline 901 and the second liquid conveying pipeline 902 can be controlled. The flow in first fluid line 901 may be made greater than, less than, or equal to the flow in second fluid line (902), as desired. And then make first transfusion pipeline 901 carry to first gun barrel 7023, the second transfusion pipeline 902 carry to the fluid volume of second gun barrel 7022 and satisfy the requirement of putting out a fire to reach better fire control effect, compromise concentrated landing and cooling performance.

Referring to fig. 5, the second fire extinguishing spray flow path 1000 located at the lower vehicle will be described.

The fire suppression spray system also includes a second fire suppression spray flow path 1000. The second fire extinguishing spray flow path 1000 includes a foam liquid mixer 605, a foam raw liquid supply flow path 300, a water supply flow path 400, and a gas supply flow path 200. The foam liquid mixer is located at the upstream of the first and second liquid conveying pipelines 901 and 902, and is in fluid communication with both the first and second liquid conveying pipelines 901 and 902. The foam liquid supply passage 300 is located upstream of the foam liquid mixer 605. The water supply path 400 is switchably in fluid communication with the froth mixing chamber of the froth liquid mixer 605, the first fire suppression spray path 900. The gas supply flow path 200 is located upstream of the fire fighting foam foaming device 100 and is in fluid communication with the fire fighting foam foaming device 100.

In some embodiments, the diameter of the gas supply flow path 200 is configured such that the flow rate is < 20m/s.

In some embodiments, the piping between the foam liquid mixer 605 and the first fire suppression spray flow path 900 and the diameter of the water spray branch 500 are both configured such that the flow rate is < 10m/s, so that the fire extinguishing medium finally output by the fire monitor 700 has better performance to meet the fire extinguishing requirements.

In order to reduce the pressure loss at the fire fighting foam foaming device 100 and improve the foaming quality, the fire fighting foam foaming device 100 is constructed such that the foam liquid injection flow rate is < 6m/s, the compressed air injection flow rate is 5-10 m/s, and the foam flow rate at the outlet of the fire fighting foam foaming device 100 is < 10m/s.

In some embodiments, the diameters of first and second fluid lines 901, 902 are configured such that the flow rate is < 12m/s to better satisfy the fire extinguishing requirements for the performance of the fire extinguishing medium ultimately output by fire monitor 700.

Referring to fig. 5, in some embodiments, the gas supply circuit 200 includes an air compressor 201, a gas distribution valve 202, a cooler 203, a first gas filter 204, a second gas filter 205, an air flow meter 206, a check valve 207, a first pressure gauge 208, and an intake throttle valve 209. Air enters the gas supply flow path 200 via the first gas filter 204 and then flows through the intake throttle valve 209 to achieve pressure regulation. And then enters the air compressor 201 and then flows toward the second gas filter 205 to secondarily filter impurities and particles in the air. And then to the gas distribution valve 202, cooler 203. A first pressure gauge 208 is provided upstream of the gas distribution valve 202 to enable gas pressure sensing. And then through the air flow meter 206 into the air line 903.

Referring to fig. 5, the foam concentrate supply flow path 300 includes a foam liquid pump 301, a foam concentrate tank 302, a foam concentrate suction valve 303, a check valve 304, a foam concentrate flow meter 305, a foam concentrate on-off valve 306, a flushing water inlet valve 307, a foam concentrate tank breather valve 308, and a foam concentrate tank inlet/outlet ball valve 309.

The water supply flow path 400 includes a water pump 401, a vacuum pump 402, a water tank 403, a check valve 404, a vacuum gauge 405, a water flow meter 406, a water suction ball valve 407, a water tank overflow pipe 408, and a water tank inlet ball valve 409. The water in the water tank 403 enters the water pump 401 through the water suction ball valve 407, and a vacuum gauge 405 is arranged on a pipeline between the water suction ball valve 407 and the water pump 401 to detect the vacuum degree of the pipeline, so that water suction is realized. After passing through the water pump 401, the water enters a check valve 404 and then enters a water flow meter 406. Then two branches are divided: a water spray branch 500 and a foam spray branch 600. The water spray branch 500 allows water pumped by the water pump 401 to directly enter the first fire extinguishing spray flow path 900 after passing through the first switching valve 501, so as to realize water spraying of the fire monitor 700. The spray froth branch 600 allows water to enter the froth liquid mixer 605 after passing through the second switching valve 601. The water tank 403 is communicated with a water tank overflow pipe 408, and overflow protection of the water tank 403 is realized through the water tank overflow pipe 408. The components of the foam spraying branch 600, the foam liquid mixer 605 and the like are part of a foam proportion mixing system and are used for obtaining foam liquid.

The fire monitor 700 comprises a monitor body assembly 701, a monitor tube assembly 702, a connecting seat 7021, a second monitor tube 7022, a first monitor tube 7023, a flow guide tube 7024, a first flow guide plate 7025, a second flow guide plate 7026, a monitor body round tube 70221, a nozzle taper tube 70222 and a nozzle straight tube 70223.

The water pump 401, the vacuum pump 402, the foam liquid pump 301 and the air compressor 201 are driven by a power device on a chassis, water and foam stock solution come from a water tank 403 and a foam stock solution tank 302 which are loaded on the chassis, and the controller 820 operates a control button according to input signals collected by various sensors and operation instructions of an operator, according to different types of combustibles, fire source positions and the like on a fire extinguishing site, calls a corresponding control program, executes the working states of the pumps and valves, accurately supplies the flow and pressure of the water, the foam stock solution or compressed gas, performs mixed or foamed fire extinguishing medium configuration, and selects different injection pipe orifices for composite injection, thereby quickly finishing different operation requirements of injecting water, injecting foam solution, injecting compressed air foam and injecting compressed air foam-foam solution, and realizing multiple applicability and high-efficiency saving on a complex petrochemical fire scene.

The logic and function of the fire suppression spray system is described in detail below in conjunction with table 1.

TABLE 1 logic control and function of fire suppression injection system

According to different operation scenes and different sprayed fire extinguishing media, in order to realize better range and foaming effect, the flow rate of each pipeline and the flow and pressure spraying parameters under respective spraying conditions are determined according to the table 2.

Table 2: pipeline flow rate design and performance parameter description under different injection working conditions of elevating injection fire truck

The jet characteristics and performance parameters in table 2 are illustrated below:

in case 1, the class A fire can be extinguished at a long range by spraying the direct current with a set flow rate of less than or equal to 150L/s, and the spraying pressure is 0.6-0.8 MPa. Self-suction vehicle-mounted water tank or externally-supplied low-pressure water, and the liquid supply is realized by the pressurization of a vehicle-mounted pump.

In case 2, the annular direct current is sprayed at a set flow rate of less than or equal to 120L/s, the fire of class A can be extinguished at a long range, and the spraying pressure is 0.6-0.8 MPa. Self-suction vehicle-mounted water tank or externally-supplied low-pressure water, and liquid supply is realized by boosting through a vehicle-mounted pump.

In case 3, the high flow rate is set to be less than or equal to 200L/s, the direct current is sprayed to extinguish the A-type fire at a long range, and the spraying pressure is 0.6-0.8 MPa. The vehicle-mounted water tank is self-sucked, and the flow supply is met through pressurization of the vehicle-mounted pump and external supply of pressure water.

In case 4, the foam liquid is directly sprayed with a set flow rate of less than or equal to 150L/s, impact foaming is carried out in the air and on the ground, the A-type or B-type fire disaster can be extinguished at a long range, and the spraying pressure is 0.6-0.8 MPa. Self-suction vehicle-mounted water tank or externally-supplied low-pressure water, and the liquid supply is realized by the pressurization of a vehicle-mounted pump.

In case 5, the foam liquid is directly sprayed at a set flow rate of less than or equal to 120L/s, impact foaming is carried out in the air and on the ground, the A-type or B-type fire disaster can be extinguished at a far range, and the spraying pressure is 0.6-0.8 MPa. Self-suction vehicle-mounted water tank or externally-supplied low-pressure water, and the liquid supply is realized by the pressurization of a vehicle-mounted pump.

In case 6, the foam liquid is directly sprayed with a large flow rate of less than or equal to 200L/s, impact foaming is carried out in the air and on the ground, the A-type or B-type fire disaster can be extinguished at a long range, and the spraying pressure is 0.6-0.8 MPa. The self-sucking vehicle-mounted water tank is pressurized by a vehicle-mounted pump, and foam liquid is supplied from the outside to meet the flow supply.

In case 7, the first gun barrel 7023 is used for direct-current spraying of compressed air foam to extinguish a type A or type B fire, the extinguishing medium is relatively dispersed, the distribution range is wide, the spraying pressure is 0.4-0.6 MPa, and the foam expansion ratio is 6. Self-suction vehicle-mounted water tank or externally-supplied low-pressure water, and the liquid supply is realized by the pressurization of a vehicle-mounted pump.

In case 8, compressed air foam and foam concentrate are directly sprayed, the foam concentrate carries the compressed air foam to travel in the air, the foam concentrate on the outer side impacts and foams in the air and on the ground, the centralized spraying of the fire extinguishing medium with a long range is realized, the A-type or B-type fire disaster can be efficiently extinguished, the spraying pressure is 0.6-0.8 MPa, and the foam foaming ratio is 6. Self-suction vehicle-mounted water tank or externally-supplied low-pressure water, and the liquid supply is realized by the pressurization of a vehicle-mounted pump.

The embodiment of the invention also provides a high-lift jet fire fighting truck which comprises an upper truck, a lower truck and the fire extinguishing jet system provided by any technical scheme of the invention. The upper vehicle is rotatably mounted to the lower vehicle. The first fire extinguishing spray flow path 900 of the fire extinguishing spray system is provided in the upper vehicle. The second fire extinguishing spray flow path 1000 of the fire extinguishing spray system is provided in the lower vehicle.

The fire fighting truck also comprises a chassis, a frame and supporting leg device, a slewing bearing and driving mechanism, a turntable assembly, a lifting arm support (or ladder frame) assembly, a fire fighting system, an electro-hydraulic system and the like.

A specific embodiment is described below. A30-40 m high-lift jet fire engine chassis adopts an 8X4 four-bridge universal chassis, and the engine power is more than or equal to 440kW. The water pump 401 adopts a large-flow fire pump, the working pressure is 1.2MPa, the flow is 180L/s, and the power is provided by a chassis engine. The foam liquid pump 301 adopts a gear pump and the like, the flow rate of the foam liquid is 750L/min, the injection pressure is 1.5MPa, and the power is provided by a chassis engine. The air compressor 201 is driven by an independent engine, and the output flow of the air is more than or equal to 18m ³ Min, pressure 1.3MPa. The volume of the water tank 403 is more than or equal to 8m ³ The volume of the foam raw liquid tank 302 is more than or equal to 5m ³ 。

The controller 820 of the elevating fire truck has the following functions:

(1) the rotating speed of the water pump 401 and the opening degrees of the second flow control valve 603 and the first flow control valve 604 can be comprehensively regulated and controlled according to the flow detection values of the water flow meter 406 and the second flow meter 610 and the pressure detection values of the fifth pressure sensor 608 and the sixth pressure sensor 609, so that the injection flow and pressure of the first gun barrel 7023 and the second gun barrel 7022 under different working conditions can be realized.

(2) The rotating speed of the foam liquid pump 301 can be automatically regulated and controlled according to the detection values of the water flow meter 406 and the second pressure gauge 602 and the requirements set according to various working conditions, the mixing ratio of the output foam liquid of the foam liquid mixer 605 is regulated in real time, and the adjustable range of the mixing ratio of the foam liquid is 1-6%.

(3) The output flow and the pressure of the air compressor 201 can be automatically regulated and controlled according to the detection values of the second flow meter 610, the fourth pressure measuring sensor 607 and the third pressure measuring sensor 606 and according to the set requirements of working conditions, the specific numerical value of the gas-liquid ratio between 4 and 6 is met, and the specific numerical value is injected into the fire-fighting foam foaming device 100 for foaming.

(4) According to table 1 introduced above: logic control and functional description of the fire suppression spray system controls the drive elements and associated valves of each flow path, ultimately achieving the results shown in table 2: the design of the pipeline of the high-flow high-lift jet fire engine with the multifunctional fire extinguishing jet system and the operation setting of the performance parameter explanation under different jet working conditions.

The main fire-fighting liquid pipeline is connected with the lower-vehicle water pump to the upper-vehicle rotary table, the drift diameter of the main fire-fighting liquid pipeline is DN160mm, and the designed flow rate is less than 10m/s. The two paths of transfusion branch pipelines connected with the upper vehicle fire-fighting liquid main pipeline have the drift diameter DN130mm and the designed flow rates of 8-10 m/s and less than 12m/s respectively. The gas supply flow path 200 from the lower part to the upper part of the fire fighting foam foaming device 100 had a diameter DN60mm and a design flow rate < 20m/s. In order to reduce the pressure loss of the fire-fighting foam foaming device 100 on the upper vehicle and improve the foaming quality, the foam liquid injection flow rate of the fire-fighting foam foaming device is less than 6m/s, the compressed air injection flow rate is 5-10 m/s, and the foam flow rate at the outlet of the fire-fighting foam foaming device 100 is less than 10m/s.

During fire-fighting spraying operation, the water pump 401, the foam pump 301 and the air compressor 201 are respectively or simultaneously started as required, water and foam concentrate are sucked from the vehicle-mounted water tank 403 and the foam concentrate tank 302, air is sucked from the first air filter 204, and the air and the foam concentrate are respectively pressurized and injected into the respective conveying pipelines. The water or foam mixed liquid is sent to the upper vehicle through the liquid conveying pipeline of the central revolving body 810, and the compressed air is sent to the upper vehicle through the gas pipeline of the central revolving body 810.

The starting of the pumps corresponding to the different flow paths and the logic control of the related switching valves, distribution valves and flow control valves can realize the supply of the fire extinguishing mediums with different types, different mixed states and different flow composite spraying to the fire monitor 700 arranged at the head end of the arm support (ladder frame) of the elevated jet fire engine by mixing different fire extinguishing mediums on the upper vehicle.

A fire-fighting liquid main pipeline connecting the lower-vehicle water pump 401 to the upper-vehicle rotary table, wherein the drift diameter of the fire-fighting liquid main pipeline is designed to control the flow rate to be less than 10m/s; the drift diameter of two transfusion branch pipelines connected with the upper vehicle fire-fighting liquid main pipeline is designed to control the flow rate to be less than 12m/s.

The gas supply passage 200 from the lower part to the upper part of the fire fighting foam generating apparatus 100 is designed to have a passage diameter controlled at a flow rate of less than 20m/s.

The elevating jet fire engine that above-mentioned technical scheme provided can realize having the different jet flow operation of three kinds of different spouts when spouting water or foam concentrate promptly: 120L/s or less, 150L/s or less, and 200L/s or less; when the compressed air foam is sprayed, the operation of spraying the foam liquid with the flow rate of 60L/s and the gas-liquid ratio of 5 times is carried out; when the compressed air foam-foam liquid is sprayed, the foam liquid with the volume of 120L/s can be sprayed with compressed air foam with the volume of 60L/s by 6 times, and the foam liquid at the outer side is impacted and foamed in the air and on the ground, so that the high-efficiency fire extinguishing of a storage tank with large flow, long range and more concentrated foam spraying far end is realized.

Referring to fig. 6, an embodiment of the present invention further provides a fire extinguishing method for a fire truck with high-pressure jet, which can be implemented by using the fire truck with high-pressure jet described in any embodiment of the present invention. The fire extinguishing method of the elevating jet fire truck comprises the following steps:

step S100: and determining the fire extinguishing medium sprayed by the elevating fire truck and the spraying mode according to the type of the fire and the fire scene.

The fire extinguishing medium comprises at least one of the following: water, foam concentrate, compressed air foam-foam concentrate. Compressed air foam-foam liquid refers to compressed air foam and foam liquid.

Among them, the types of fire include: a class a solid matter fire, a class B liquid or meltable solid matter fire. The fire scene includes: the method is characterized by comprising the following steps of carrying out fire disaster on the whole area of a large storage tank, fire in a pool in a fire bank of a tank area, leakage and flowing fire of a pipeline in the tank area and the like. The injection mode comprises the following steps: (1) The first gun barrel 7023 and the second gun barrel 7022 are selected to be sprayed, and in this case, the required flow and the required fire extinguishing medium are determined according to requirements; (2) The first cannon barrel 7023 and the second cannon barrel 7022 are ejected simultaneously, and the extinguishing media ejected by the first cannon barrel and the second cannon barrel are of the same type, so that ejection with larger flow can be realized; (3) The first gun barrel 7023 and the second gun barrel 7022 spray at the same time, and the types of fire extinguishing media sprayed by the first gun barrel 7023 and the second gun barrel 7022 are different, so that carrying can be realized, and the spraying is more concentrated and the spraying range is farther.

Step S200: the communication state of the first fire extinguishing spray flow path 900 of the elevating jet fire engine is determined according to the fire extinguishing medium sprayed from the elevating jet fire engine and the spray pattern.

Step S300: the pressure and/or flow of the first fire suppression spray flow path 900 is adjusted to achieve the jet performance requirements of each operating condition to extinguish the fire. This way of extinguishing the fire is more efficient.

Specifically, according to the communication state of the first fire extinguishing spray flow path 900 of the elevating spray fire truck and the communication state of the related pipelines according to the first fire extinguishing spray flow path 900 of the elevating spray fire truck and the pressure and flow detection input of the related pipelines, the output parameters of the water pump 401, the air compressor 201 and the foam liquid pump 301 are regulated and controlled, and the jet performance requirements of all working conditions are realized. In the above step S300, when the first barrel 7023 and the second barrel 7022 are simultaneously injected, the flow rate ratio of the two is determined.

When the sprayed fire extinguishing medium is water or foam concentrate, the spraying flow rate of the high-spraying fire fighting truck is set to be one of the following flows: 120L/s or less, 150L/s or less, and 200L/s or less.

When the extinguishing medium sprayed is water, the fire monitor 700 of the elevated jet fire engine is configured to adopt one of the following modes of operation: the first barrel 7023 of the fire monitor 700 sprays water, the second barrel 7022 of the fire monitor 700 sprays water, and both the first barrel 7023 and the second barrel 7022 of the fire monitor 700 spray water.

When the injected extinguishing medium is foam concentrate, the fire monitor 700 of the elevated jet fire engine is configured to operate in one of the following modes: the foam liquid is sprayed by the first gun barrel 7023 of the fire monitor 700, the foam liquid is sprayed by the second gun barrel 7022 of the fire monitor 700, and the foam liquid is sprayed by both the first gun barrel 7023 and the second gun barrel 7022 of the fire monitor 700.

When the extinguishing medium sprayed is compressed air foam, the spray flow rate of the fire truck is set as follows: the spraying flow rate of the foam liquid is 55-65L/s, and the gas-liquid ratio is 4.5-5.5 times. Specifically, for example, 60l/s and a gas-liquid ratio of 5 times.

When the injected extinguishing medium is compressed air foam, the fire monitor 700 of the elevated jet fire engine is configured to operate in the following mode: the first barrel 7023 of the fire monitor 700 is sprayed with compressed air foam and the second barrel 7022 of the fire monitor 700 is in a non-spraying state.

When the sprayed fire extinguishing medium is compressed air foam-foam liquid, the spraying flow rate of the high-spraying fire fighting truck is set as follows: the 120L/s foam concentrate carried 60L/s by 6 times the compressed air foam jet.

When the extinguishing medium sprayed is compressed air foam-foam concentrate, the fire monitor 700 of the elevated jet fire engine is configured to operate in the following mode: the first barrel 7023 of the fire monitor 700 sprays compressed air foam and the second barrel 7022 sprays foam concentrate.

In the description of the present invention, it is to be understood that the terms "central", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the scope of the present invention.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: it is to be understood that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof, but such modifications or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (17)

1. A fire extinguishing method for a lifting jet fire engine is characterized by comprising the following steps:

determining fire extinguishing medium and a spraying mode sprayed by a high-lift spraying fire truck according to the type and the scene of the fire; the fire extinguishing medium comprises at least one of the following: water, foam concentrate, compressed air foam-foam concentrate;

determining the communication state of a first fire extinguishing spray flow path (900) of the elevating spray fire truck according to the fire extinguishing medium sprayed by the elevating spray fire truck and the spray mode;

and adjusting the pressure and/or flow of the first fire extinguishing spray flow path (900) to meet the jet performance requirements of various working conditions to extinguish fire.

2. The method of extinguishing a fire in a fire truck with a fire of claim 1, wherein the spray pattern comprises:

the first gun barrel (7023) and the second gun barrel (7022) are selected for spraying;

the first gun barrel (7023) and the second gun barrel (7022) are sprayed simultaneously, and the fire extinguishing mediums sprayed by the first gun barrel and the second gun barrel are of the same type;

the first gun barrel (7023) and the second gun barrel (7022) are sprayed simultaneously, and the types of fire extinguishing media sprayed by the first gun barrel and the second gun barrel are different.

3. The fire extinguishing method of a fire truck according to claim 1, wherein when the extinguishing medium to be sprayed is water or foam concentrate, the flow rate of the spray of the fire truck is set to one of: 120L/s or less, 150L/s or less, and 200L/s or less.

4. The fire extinguishing method of a high-lift jet fire engine according to claim 1, wherein when the fire extinguishing medium to be sprayed is compressed air foam, the flow rate of the spray of the high-lift jet fire engine is set to: the injection flow rate of the foam liquid is 60L/s, and the gas-liquid ratio is 5 times.

5. The fire extinguishing method for a high-lift jet fire fighting vehicle according to claim 1, wherein when the fire extinguishing medium to be sprayed is compressed air foam-foam liquid, the spraying flow rate of the high-lift jet fire fighting vehicle is set to: the 120L/s foam concentrate carried 60L/s by 6 times the compressed air foam jet.

6. Method of extinguishing fire by elevated jet fire fighting vehicle according to claim 1, characterized in that when the extinguishing medium sprayed is water, the fire monitor (700) of the elevated jet fire fighting vehicle is configured to adopt one of the following modes of operation: the water-saving fire monitor is characterized in that a first gun tube (7023) of the fire monitor (700) sprays water, a second gun tube (7022) of the fire monitor (700) sprays water, and the first gun tube (7023) and the second gun tube (7022) of the fire monitor (700) spray water.

7. Method of fighting fires in high-jet fire engines, as claimed in claim 1, characterized in that the fire monitor (700) of the high-jet fire engine is configured to adopt one of the following modes of operation when the extinguishing medium sprayed is foam concentrate: the foam liquid is sprayed on a first gun tube (7023) of the fire monitor (700), the foam liquid is sprayed on a second gun tube (7022) of the fire monitor (700), and the foam liquid is sprayed on both the first gun tube (7023) and the second gun tube (7022) of the fire monitor (700).

8. Method of extinguishing fires in elevated jet fire engines, according to claim 1, characterized in that the fire monitor (700) of the elevated jet fire engine is constructed to adopt the following operating mode when the extinguishing medium sprayed is compressed air foam: the first barrel (7023) of the fire monitor (700) is sprayed with compressed air foam and the second barrel (7022) of the fire monitor (700) is in a non-spraying state.

9. Method of extinguishing fires in elevated jet fire engines, as in claim 1, characterized in that the fire monitor (700) of the elevated jet fire engine is constructed to adopt the following operating modes when the extinguishing medium sprayed is compressed air foam-foam concentrate: the first gun tube (7023) of the fire monitor (700) sprays compressed air foam, and the second gun tube (7022) sprays foam liquid.

10. The fire extinguishing method for a high-lift jet fire engine according to claim 1, wherein the high-lift jet fire engine comprises:

a fire extinguishing spraying system configured to spray a fire extinguishing medium;

a step of getting off, wherein a second fire extinguishing injection flow path (1000) of the fire extinguishing injection system is arranged on the getting off; and

and an upper vehicle rotatably mounted on the lower vehicle, wherein a first fire extinguishing spray flow path (900) of the fire extinguishing spray system is provided on the upper vehicle.

11. The method of suppressing a fire in a high lift jet fire engine of claim 10, wherein said fire suppression spray system comprises:

a first extinguishing spray flow path (900) including a first liquid transfer line (901), a second liquid transfer line (902), and a gas transfer line (903);

the fire-fighting foam foaming device (100) is in fluid communication with the first liquid conveying pipeline (901) and the gas conveying pipeline (903) and is positioned at the downstream of the first liquid conveying pipeline (901) and the gas conveying pipeline (903); and

the fire monitor comprises a fire monitor (700), wherein a first monitor pipe (7023) of the fire monitor (700) is in fluid communication with the fire foam foaming device (100), a second monitor pipe (7022) of the fire monitor (700) is in fluid communication with both the second infusion pipeline (902) and the gas pipeline (903), and the fire monitor (700) is located at the downstream of the first infusion pipeline (901), the second infusion pipeline (902) and the gas pipeline (903).

12. Fire extinguishing method of a fire truck according to claim 11, characterized in that the fire extinguishing injection system further comprises a second fire extinguishing injection flow path (1000), the second fire extinguishing injection flow path (1000) comprising:

a foam liquid mixer (605) which is located at the upstream of the first infusion pipeline (901) and the second infusion pipeline (902) and is in fluid communication with the first infusion pipeline (901) and the second infusion pipeline (902);

a foam raw liquid supply passage (300) located upstream of the foam liquid mixer (605); the foam raw liquid supply channel (300);

a water supply flow path (400) switchably in fluid communication with a mixing chamber of the foam liquid mixer (605), the first fire suppression spray flow path (900); and

a gas supply flow path (200) located upstream of the fire fighting foam foaming device (100) and in fluid communication with the fire fighting foam foaming device (100).

13. Fire extinguishing method according to claim 12, characterized in that the diameter of the gas supply flow path (200) is configured so that the flow rate is < 20m/s.

14. Fire extinguishing method according to claim 12, characterized in that the diameter of the piping between the foam liquid mixer and the first fire extinguishing spray flow path (900) is configured so that the flow rate < 10m/s.

15. Fire extinguishing method according to claim 12, characterized in that the fire fighting foam-forming device (100) is constructed with a foam concentrate injection flow rate < 6m/s, a compressed air injection flow rate of 5-10 m/s, and a foam flow rate at the outlet of the fire fighting foam-forming device (100) of < 10m/s.

16. Fire extinguishing method according to claim 12, characterized in that the diameters of the first and second liquid feed lines (901, 902) are configured such that the flow rate < 12m/s.

17. The method of suppressing a fire in a high-lift jet fire engine of claim 12, wherein said first fire suppression spray flow path (900) further comprises:

a first flow control valve (603) mounted on the first infusion pipeline (901) to regulate the flow of the first infusion pipeline (901); and/or the presence of a gas in the gas,

a second flow control valve (604) mounted to the second fluid line (902) to regulate a flow of the second fluid line (902).

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