CN117982830A

CN117982830A - Gel foam generation method, system, fire rescue equipment and fire extinguishing method

Info

Publication number: CN117982830A
Application number: CN202410159847.8A
Authority: CN
Inventors: 刘延斌; 郭伦文; 付玲; 文杰; 蒋凯歌; 李睿; 尹莉; 佘玲娟; 周磊
Original assignee: Zoomlion Heavy Industry Science and Technology Co Ltd
Current assignee: Zoomlion Heavy Industry Science and Technology Co Ltd
Priority date: 2024-02-04
Filing date: 2024-02-04
Publication date: 2024-05-07

Abstract

The application relates to the technical field of fire rescue and discloses a gel foam generating method, a gel foam generating system, fire rescue equipment and a fire extinguishing method, wherein the gel foam generating method comprises a foaming step and a gel foam spraying step, in the foaming step S1, mixed liquid of first compressed gas, foam solution and a gelatinizing agent is respectively introduced into a foaming cavity of a foaming device, so that the mixed liquid of the foam solution and the gelatinizing agent generates and outputs foam under the disturbance action of the first compressed gas; in the gel foam spraying step S2, the condensation promoting liquid and the foam outputted from the foaming device are respectively introduced into the gel foam spraying device, and the condensation promoting liquid and the foam are mixed and then sprayed outwards. Because the gelling agent is mixed with the foam solution and foamed first before being mixed with the setting accelerator, the setting accelerator and the gelling agent can be mixed more fully, thereby the gel reaction can be quickly and efficiently carried out to generate and spray fine gel foam, and the fire extinguishing and fire scene isolation effects are good.

Description

Gel foam generation method, system, fire rescue equipment and fire extinguishing method

Technical Field

The application relates to a fire rescue technology, in particular to a gel foam generation method, a gel foam generation system, fire rescue equipment and a fire extinguishing method.

Background

With the development of town level, emergency rescue scenes such as high floors and large fire sites are gradually increased, and the scene of fire rescue is increasingly complicated and urgent, so that the requirements for a fire extinguishing agent and an emergency rescue device which integrate multiple functions such as rapid fire extinguishing, heat insulation and flame retardance are urgent.

Foam fire extinguishing is a common fire extinguishing method, and the aim of extinguishing fire is achieved by covering the surface of a combustion object with generated foam, blocking air from contacting the combustion object, absorbing heat and reducing the temperature of the combustion object. The water-based foam extinguishing agent is widely used for extinguishing different types of fires such as solid matter fires, liquid fires, gas fires and the like due to the advantages of low cost, wide application range, easiness in quick deployment and the like. Typically, such fire suppression systems may utilize compressed gas as a power source to mix compressed gas, water, and a foam concentrate to generate and discharge outwardly a fire suppression foam. However, conventional water-based foam extinguishing agents have the disadvantages of poor fire resistance (at 1000 ℃ C., within 4 min), short foam retention time (usually within 20 min), etc., and are difficult to isolate fire for a long period of time.

For this reason, the prior art has proposed a gel foam generating apparatus and a fire extinguishing method such as for coal mine fire prevention and extinguishing by causing high pressure air and high pressure water to flow through a venturi tube to form negative pressure to suck a gelling agent, a foaming agent and a crosslinking agent (coagulant) into a foam generator to generate a gel foam which can be injected into a fire place such as a coal spontaneous combustion area for fire extinguishing. In contrast, the fire extinguishing agent of the inorganic gel system has remarkably good fire resistance and long foam retention time, for example, the silicate inorganic gel system has the fire resistance time of more than 20 minutes and the foam retention time of more than 24 hours under the environment of 1000 ℃, and has remarkable advantages for complex fire sites such as forest fires, chemical raw material fires, forest isolation belt development and the like. However, the above prior art mixes various fire extinguishing raw materials such as gas, water, a gelling agent, a foaming agent, and a coagulant at the same time in a foam generator, and has poor fire extinguishing and fire-site isolating effects.

Disclosure of Invention

The application aims to overcome the problems in the prior art and provide a gel foam generation method which can generate gel reaction more quickly to generate and spray fine gel foam so as to realize good fire extinguishing and fire scene isolation effects.

In order to achieve the above object, an aspect of the present application provides a gel foam generating method comprising:

s1, a foaming step, namely respectively introducing a first compressed gas and a mixed solution of a foam solution and a gelling agent into a foaming cavity of a foaming device, so that the mixed solution of the foam solution and the gelling agent generates and outputs foam under the disturbance action of the first compressed gas;

s2, gel foam spraying, namely respectively introducing the condensate and the foam output by the foaming device into a gel foam spraying device, and enabling the condensate to be mixed with the foam in the gel foam spraying device and then sprayed outwards.

Optionally, the first compressed gas and the mixed solution of the foam solution and the gelling agent are continuously introduced into the foaming cavity, so that the foam generated by the foaming device is introduced into the gel foam injection device under the action of the first compressed gas, and then the foaming step S1 and the gel foam injection step S2 are performed.

Optionally, the mixed solution of the foaming solution and the gelling agent is stored in a main liquid tank, and the foaming step S1 further includes: monitoring the mass change rate of the main liquid tank, and controlling the flow rate of the mixed liquid of the foam solution and the gelatinizing agent which is introduced into the foaming cavity from the main liquid tank according to the mass change rate;

and/or the coagulation accelerator is stored in a coagulation accelerator tank, the gel foam spraying step S2 further comprises: the rate of change of mass of the coagulation liquid tank is monitored and the flow of coagulation liquid from the coagulation liquid tank into the gel foam injection device is controlled in accordance with the rate of change of mass.

Optionally, the main tank and/or the coagulation liquid tank are/is mounted on a weighing unit; the gel foam generating method further comprises: and the weighing unit monitors the mass change amount of the main liquid tank and/or the coagulation liquid tank within a set time length to obtain the corresponding mass change rate.

Optionally, a main liquid tank liquid outlet regulating valve for controlling the flow of the mixed liquid of the foam solution and the gelling agent is arranged on a communication flow path between the main liquid tank and the foaming cavity; the gel foam spraying step S2 further includes: when the liquid storage amount or pressure in the main liquid tank is lower than a preset value, closing a liquid outlet regulating valve of the main liquid tank, and discharging residual accumulated liquid in the gel foam injection device;

and/or a liquid outlet regulating valve of the coagulation promoting liquid tank for controlling the flow of the coagulation promoting liquid is arranged on a communication flow path between the coagulation promoting liquid tank and the gel foam spraying device; the gel foam spraying step S2 further includes: and when the liquid storage amount or pressure in the coagulation-accelerating liquid tank is lower than a preset value, closing the coagulation-accelerating liquid tank liquid outlet regulating valve, and discharging residual accumulated liquid in the gel foam injection device.

Optionally, the foaming device is provided with a mixed liquid inlet channel, a foam output channel and a plurality of compressed gas jet channels which are respectively communicated with the foaming cavity, and the mixed liquid inlet channel is surrounded by the foam output channel; the foaming step S1 further comprises: and guiding the mixed solution of the foam solution and the gelling agent to be sprayed to the dispersion disc by utilizing the mixed solution inlet channel to form a dispersion liquid flow, injecting a plurality of air flows introduced by the compressed air jet channel into the foaming cavity to disturb the dispersion liquid flow and generate the foam, and outputting the foam to the gel foam spraying device through the dispersion disc and the foam output channel.

Optionally, a dispersion guiding conical surface for guiding the mixed solution of the foam solution and the gelling agent to disperse is formed on the end face of the dispersion disc facing the mixed solution inlet channel.

Optionally, the foaming device comprises a mixed liquor nozzle, wherein the mixed liquor inlet channel is at least partially formed in the mixed liquor nozzle and has a tapered through flow sectional area at one end facing the foaming cavity, and the peripheral wall surface of the mixed liquor nozzle facing the one end of the foaming cavity is formed into a tapered jet guiding conical surface.

Optionally, the foaming device includes a first housing part and a second housing part which are hermetically connected to each other and define a housing cavity, the mixed liquid nozzle is installed in the housing cavity, and has an annular boss part which is hermetically engaged with an inner wall surface of the housing cavity to divide the housing cavity into an annular air cavity and the foaming cavity by the annular boss part, the compressed gas jet channel is formed on the annular boss part, and a compressed gas inlet port which is communicated to the annular air cavity is formed on the first housing part.

Optionally, a plurality of struts with both ends respectively abutting to the annular boss portion and the end wall of the housing cavity in the second housing portion are connected to the liquid dispersion disk, and the mixed liquid nozzle is installed to abut to the end wall of the housing cavity in the first housing portion.

Optionally, the gel foam spraying device comprises:

the cylinder wall of the feeding cylinder is provided with a mixed foam inlet; and

The feeding core is arranged in the cylinder cavity of the feeding cylinder in a penetrating way, and is provided with a liquid inlet channel, and a coagulation accelerator inlet and a coagulation accelerator outlet which are respectively communicated with the liquid inlet channel;

Wherein, the section of thick bamboo chamber includes feed cavity and preliminary mixing chamber along axial intercommunication, the feed cavity for forming the annular cavity between the periphery wall of feed core with the inner peripheral wall of feed cylinder, mixed foam entry intercommunication extremely the feed cavity, the liquid outlet intercommunication of procoagulant to preliminary mixing chamber.

Optionally, the central axis of the mixed foam inlet is radially offset with respect to the central axis of the feed chamber to be in a non-planar arrangement.

Optionally, the gel foam spraying device further comprises a mixing pipe arranged at the downstream of the feeding cylinder, the pipe cavity of the mixing pipe comprises a stirring and mixing cavity capable of being communicated with the preliminary mixing cavity, and a stirring and mixing assembly is arranged in the stirring and mixing cavity.

Optionally, the tube cavity of the mixing tube further comprises a rectifying cavity positioned at the downstream of the stirring mixing cavity, a rectifying component is arranged in the rectifying cavity, and a plurality of rectifying flow channels which are arranged in parallel along the axial direction are formed in the rectifying component.

Optionally, the gel foam injection device further comprises an on-off valve connected between the mixing tube and the feed cylinder and/or a gel foam nozzle connected to an end of the mixing tube remote from the feed cylinder.

Optionally, the mixture of the foaming solution and the gelling agent is stored in a main tank, the coagulation accelerator is stored in a coagulation accelerator tank, and the gel foam generating method further comprises a pressurized premixing step S0 performed before the foaming step S1, the pressurized premixing step S0 comprising a pressurizing sub-step:

Introducing second compressed gas below the liquid level in the main liquid tank until the air pressure in the main liquid tank reaches a preset pressure, and conveying the mixed liquid of the foam solution and the gelatinizing agent in the main liquid tank to the foaming cavity under the action of the air pressure in the foaming step S1 and the gel foam spraying step S2; and/or introducing third compressed gas into the coagulation accelerator tank until the air pressure in the coagulation accelerator tank reaches a preset pressure, and conveying the coagulation accelerator liquid in the coagulation accelerator tank to the gel foam spraying device under the action of the air pressure in the gel foam spraying step S2.

Optionally, the first compressed gas, the second compressed gas, and the third compressed gas are from the same compressed gas source.

Optionally, the pressurizing premixing step S0 further comprises a filling sub-step performed before the pressurizing sub-step:

Injecting water into the main liquid tank, injecting foam stock solution and a gelling agent into the main liquid tank, and injecting water into the main liquid tank again, wherein a flow path of the injected water into the main liquid tank at least partially overlaps with a flow path of the injected foam stock solution and the gelling agent; and/or the number of the groups of groups,

And injecting the condensate into the condensate-accelerating tank, monitoring the liquid quantity in the condensate-accelerating tank in real time, and reducing the injection speed in the injection process.

A second aspect of the present application provides a gel foam generating system employing the gel foam generating method described above.

A third aspect of the application provides a fire rescue apparatus comprising the gel foam generating system described above.

A fourth aspect of the present application provides a fire extinguishing method of generating a gel foam using the above gel foam generating method and spraying the gel foam onto a surface of a combustion object.

According to the gel foam generating method, the mixed solution of the prefabricated foam solution, the gelling agent and the first compressed gas are introduced into a foaming cavity of a foaming device to generate foam, and then the foam and the coagulation accelerator are introduced into a gel foam spraying device to be mixed to generate gel foam; because the gelling agent is first mixed with the foaming solution and foamed before mixing with the setting accelerator, the setting accelerator and the gelling agent can be more thoroughly mixed, thereby enabling rapid and efficient gel reaction at the outlet of the gel foam injection device to generate and inject fine gel foam which can be injected to cover the fire site isolation air; meanwhile, the temperature is reduced due to gradual evaporation of water in the gel film, and the gel film is more resistant to high temperature due to water locking performance of the gel, so that good fire extinguishing and fire scene isolation effects are realized.

Drawings

FIG. 1 is a schematic diagram of a gel foam generating system and fire rescue apparatus for performing the gel foam generating method and fire extinguishing method of the present application;

FIG. 2 is a cross-sectional view of the foam generating system of the gel and the foaming device of the fire rescue apparatus of FIG. 1;

FIG. 3 is an exploded view of the foaming device of FIG. 2;

FIG. 4 is a perspective view of the foaming device of FIG. 2;

FIG. 5 is a cross-sectional view of one embodiment of the gel foam generating system and gel foam injection apparatus of the fire rescue device of FIG. 1;

FIG. 6 is a sectional view showing the assembled structure of a feed cylinder and a feed core of the gel foam injection apparatus of FIG. 5;

FIG. 7 is a view of the assembled configuration of the feed barrel and feed core of FIG. 6, as viewed from the side of the mixed foam inlet;

FIG. 8 is a cross-sectional view A-A of the assembled configuration of the feed cylinder and feed core of FIG. 7;

fig. 9, 10 and 11 are schematic structural views of rectifying components according to various embodiments of the present application;

FIG. 12 is an exploded view of the installation of a feed structure according to another embodiment of the application;

FIG. 13 is an assembled schematic view of the feed structure of FIG. 12;

FIG. 14 is a cross-sectional view of the B-B position of FIG. 13;

fig. 15 is a cross-sectional view of the C-C position of fig. 13.

Description of the reference numerals

1-A compressed air source; 2-a compressed air source pressure gauge; 3-a compressed gas total switch valve; 4-a pressure reducing and regulating valve; 5-gas distributor; 5.1-a foaming air supply regulating valve; 5.2-a set-accelerating tank air supply valve; 5.3-main tank air supply valve; 6-a water supply source; 7-a fire-extinguishing foam liquid tank; 8-a gellant cartridge; 9-a coagulant storage cartridge; 10-a water pump; 11-foam liquid pump; 12-a gellant pump; 13-a coagulant pump; 14-a main liquid tank liquid supply valve; 15-a coagulation liquid tank liquid supply valve; 16-a main liquid tank; 17-a coagulation accelerator tank; 18-a porous air outlet pipe; 19-a filtration unit; 20-a safety valve; 21-a storage tank pressure gauge; 22-a pressure relief valve; 23-a weighing unit; 24-a main liquid tank liquid outlet regulating valve; 25-a coagulation liquid tank liquid outlet regulating valve;

26-foaming device; 26 a-a foaming chamber; 26 b-a mixed liquor inlet channel; 26 c-compressed gas jet channels; 26 d-foam output channel; 26 e-an annular air cavity; 26 f-compressed gas inlet; 261-a first shell portion; 262-a second housing part; 263-a dispersion disc; 264-a mixed liquor nozzle; 2641-annular boss portion; 265-support;

27-a gel foam injection device; 27 a-a mixed foam inlet; 27 b-a liquid inlet flow channel; 27 c-a coagulant inlet; 27 d-a coagulation liquid outlet; 27 e-a feed chamber; 27 f-stirring and mixing cavity; 27 g-rectifying chamber; 27 h-a preliminary mixing chamber; 271-a feed drum; 272-a feed core; 273-switching valve; 274-mixing tube; 275-a stirring and mixing assembly; 276-rectifying component; 277-gel foam nozzle; 281-grooving plugs; 282-elastic member; 283-adjusting the transition piece; 284-support base.

Detailed Description

The following describes specific embodiments of the present application in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the application, are not intended to limit the application.

A first aspect of the present application provides a gel foam generating method that can generate a gel foam based on a compressed gas, a foam solution, a gelling agent, a coagulant, and the like; a second aspect of the present application provides a fire extinguishing method, which adopts the gel foam generating method provided in the first aspect to generate gel foam, and sprays the gel foam onto the surface of a combustion object to block air from contacting the combustion object, so as to realize fire extinguishing and fire scene isolation; a third aspect of the present application provides a gel foam generating system capable of performing the above gel foam generating method; and, a fourth aspect of the present application provides a fire rescue apparatus including the gel foam generating system.

Fig. 1 shows a schematic diagram of a gel foam generating system and fire rescue equipment according to an embodiment of the present application. The gel foam generating system comprises a compressed air source 1, a main liquid tank 16, a foaming device 26, a coagulation accelerator supply module and a gel foam spraying device 27 which are connected through pipelines.

The compressed air source 1 may be a compressed air cylinder, an air compressor, or the like, which may provide a high-pressure air, or a compression device capable of outputting air, nitrogen, or other non-combustible gas, for example, at a pressure of not less than 0.8 MPa. The main tank 16 stores therein a mixed solution of a foaming solution and a gelling agent, and for example, as described later, water, a foaming stock solution or a foaming agent, and a gelling agent may be injected into the main tank 16 in advance and mixed sufficiently by introducing a compressed gas under the liquid surface to form a mixed solution of a foaming solution and a gelling agent and generate foam preliminarily. The foaming device 26 has a foaming chamber 26a (see fig. 2) capable of receiving the compressed gas (first compressed gas) from the compressed gas source 1 and the mixed liquid of the foaming solution and the gelling agent from the main tank 16, and generating and outputting the foam under the disturbance of the first compressed gas. Foam output from the foaming device 26 and the promoting fluid from the coagulation liquid supply module may be introduced into the gel foam spraying device 27 to be sprayed outward after being mixed in the gel foam spraying device 27.

Thus, the present application provides a gel foam method capable of quick reaction and producing good fire extinguishing isolation effect, comprising a foaming step S1 and a gel foam spraying step S2, wherein, in the foaming step S1, a first compressed gas such as from a compressed gas source 1 and a mixed liquid of a foam solution and a gelling agent from a main liquid tank 16 are respectively introduced into a foaming cavity 26a of a foaming device 26, so that the mixed liquid of the foam solution and the gelling agent generates foam under the disturbance of the first compressed gas, and the foam is output to a gel foam spraying device 27 under the pressure; in the gel foam spraying step S2, the coagulation accelerator from the coagulation accelerator supply module (such as the coagulation accelerator tank 17) is introduced into the gel foam spraying device 27 and mixed with the foam outputted from the foaming device 26 to generate and spray out the gel foam. It will be appreciated that for ease of understanding, the source of the first compressed gas, the mixed liquor of the foaming solution and the gelling agent, and the procoagulant liquid are exemplified in the description herein in connection with the drawings, but the gel foam process of the present application is not dependent upon these particular forms of sources of fire suppressing material.

In the above-described gel foam generating method of the present application, the foam is generated by introducing the mixed liquid of the preformed foam solution and the gelling agent and the first compressed gas into the foaming chamber 26a of the foaming device 26, and then the foam and the accelerator are introduced into the gel foam injecting device 27 to be mixed to generate the gel foam. Since the gelling agent is first mixed with the foaming solution in, for example, the main tank 1 and foamed in the foaming chamber 26a before being mixed with the setting accelerator, the setting accelerator and the gelling agent can be more sufficiently mixed after being further introduced into the gel foam spraying device 27, whereby a gel reaction can be rapidly and efficiently performed at the outlet of the gel foam spraying device 27 to generate and spray fine gel foam which can be sprayed to cover the air isolated from the fire scene, and at the same time, the temperature is lowered due to the gradual evaporation of the moisture in the gel film and the high temperature is more resistant due to the water locking property of the gel, so that good fire extinguishing and fire scene isolating effects can be achieved.

The inventors of the present application explored and observed that it is difficult for the gel foam sprayed by the gel foam fire extinguishing system of the prior art to ensure that the gelling agent and the coagulant are sufficiently mixed, and the gel time is long after the gelling agent and the coagulant are sprayed to the surface of the combustion object, thereby influencing the fire extinguishing and fire scene isolation effects. In a specific manner, the gel foam generating method of the application performs the mixing step of the gel promoting liquid and the gelling agent in the gel foam spraying device 27 for spraying the gel foam outwards, and the gelling agent is mixed with the foam solution in advance and generates foam under the action of compressed gas, so that the problems of insufficient mixing, lower foaming multiple, blocked pipelines and the like caused by simultaneous mixing of various fire extinguishing raw materials can be effectively avoided, and the gel foam can be sprayed outwards rapidly, efficiently and reliably, thereby achieving the purposes of rapid fire extinguishing and fire scene isolation.

It should be noted that, although the gel foam generating method of the present application has the foaming step S1 and the gel foam spraying step S2 performed sequentially from the viewpoint of the gel foam generating process, the foaming step S1 and the gel foam spraying step S2 are performed separately at different periods of time spaced from each other, which is obviously disadvantageous for the achievement of the purpose of generating gel foam and extinguishing fire. Therefore, during actual operation, the foaming step S1 and the gel foam spraying step S2 are usually required to be performed continuously and synchronously for a period of time until the aim of extinguishing fire is achieved. For this purpose, the first compressed gas and the mixed liquid of the foam solution and the gelling agent may be continuously introduced into the foaming chamber 26a, whereby the foam generated in the foaming chamber 26a can be continuously output to the gel foam injection device 27 under pressure, and further the gel foam can be generated by introducing the condensation promoting liquid into the gel foam injection device 27. In this process, the foaming step S1 and the gel foam ejecting step S2 are sequentially performed and synchronized for a period of time, whereby the gel foam can be continuously ejected outward.

As previously described, the mixture of the foaming solution and the gelling agent may be stored in the main tank 16 and the promoting solution may be stored in the coagulation accelerator tank 17. In order to facilitate the control of the flow rates of the mixed solution of foam solution and gelling agent and of the accelerating liquid within a predetermined range, generating a gel foam suitable for extinguishing a fire, the main tank 16 and the accelerating liquid tank 17 may be mounted on a weighing unit 23, respectively, so as to be able to measure the mass of the main tank 16 and the accelerating liquid tank 17 by the weighing unit 23, thereby monitoring the mass variations of the mixed solution of foam solution and gelling agent and of the accelerating liquid therein, and obtaining the flow rates of the mixed solution of foam solution and gelling agent and of the accelerating liquid delivered in combination with time elements. For example, the main tank 16 and the coagulation accelerator tank 17 may be carried on respective weighing units 23 by tank mounting pads and mounting frames, respectively, and the weighing units 23 monitor the mass changes Δm1 and Δm2 of the main tank 16 and the coagulation accelerator tank 17, respectively, over a set period of time (e.g., 0.5s-5 s), and take n times (n=3, 4, … …) of the average value and compare the average value with a preset value, so as to determine whether the real-time flow is within a set flow range, and can adjust the flow of the mixed solution of the foam solution and the coagulation accelerator as needed (e.g., through a main tank outlet adjusting valve 24 and a coagulation accelerator tank outlet adjusting valve 25 described later).

In alternative embodiments, the change in the liquid amount in the main tank 16 and the coagulation accelerator tank 17 or the flow rate of the mixed liquid of the foaming solution and the gelling agent and the coagulation accelerator delivered to the foaming device 26 and the gel foam injection device 27 may be monitored by other means. For example, the main tank 16 and the coagulant tank 17 may be provided with level gauges so as to be able to determine the output flow rate by monitoring the level variations therein. In contrast, since there may be foam in the main tank 16 and the coagulation accelerator tank 17, monitoring the mass change rates of the main tank 16 and the coagulation accelerator tank 17 and controlling the flow rates of the mixed liquid of the foam solution and the gelling agent in accordance therewith has higher control accuracy. For another example, flow meters may be provided in the communication flow path between the main tank 16 and the foaming device 26 and the communication flow path between the coagulation accelerator tank 17 and the gel foam injection device 27, respectively, to directly measure the flow rates of the mixed liquid of the foam solution and the gelling agent and the coagulation accelerator.

Further, a main tank outlet regulating valve 24 for controlling the flow rate of the mixed liquid of the foam solution and the gelling agent may be provided in the communication flow path between the main tank 16 and the foaming chamber 26a, and an accelerating tank outlet regulating valve 25 for controlling the flow rate of the accelerating liquid may be provided in the communication flow path between the accelerating tank 17 and the gel foam spraying device 27, and the valve cores and valve chambers of the main tank outlet regulating valve 24 and the accelerating tank outlet regulating valve 25 are preferably made of a corrosion-resistant material or subjected to a corrosion-resistant treatment. Depending on the monitored mass change rates of the main tank 16 and the coagulation accelerator tank 17 or the flow rates of the mixed liquid of the foam solution and the gelling agent and the coagulation accelerator, the opening degree of the main tank liquid outlet regulating valve 24 and/or the coagulation accelerator tank liquid outlet regulating valve 25 can be controlled so as to keep the flow rate ratio thereof suitable for generating the gel foam required for extinguishing a fire. For example, the opening degree of the main tank liquid outlet regulating valve 24 and/or the coagulation accelerator tank liquid outlet regulating valve 25 is adjusted by a control algorithm such as PID so that the error of the mass change amounts Δm1, Δm2 of the main tank 16 and coagulation accelerator tank 17 within a set time length (e.g., 0.5s-5 s) from the respective preset values is kept within a predetermined range. When the outward ejection of the gel foam is stopped by, for example, closing the on-off valve 273 (see fig. 5 and 6) of the gel foam injection device 27, it is monitored that the mass change amounts Δm1, Δm2 of the main tank 16 and the coagulation accelerator tank 17 are rapidly reduced to 0, and it is not necessary to change the opening degrees of the main tank liquid outlet regulating valve 24 and the coagulation accelerator tank liquid outlet regulating valve 25.

In some cases, the gel foam generating system cannot or does not continue to generate gel foam, and then the main tank outlet regulating valve 24 and the coagulation accelerator tank outlet regulating valve 25 need to be closed in time to prevent the mixed solution of the foam solution and the gelling agent and the coagulation promoting solution from being delivered to the foaming device 26 and the gel foam spraying device 27. For example, when the fire is extinguished, the gel foam generating system is not used for a relatively long time (more than 1 h) or when the liquid amount or pressure in the main tank 16 or the coagulation liquid tank 17 (in the case of delivery by pressure) is reduced to a low value, the generation of gel foam is stopped and the remaining liquid is prevented from being delivered to the main tank 16 or the coagulation liquid tank 17. For this reason, when the use is not performed for a relatively long period of time (1 hour or more), or when the liquid storage amount or pressure in the main liquid tank 16 is lower than a predetermined value, or when the liquid storage amount or pressure in the coagulation liquid tank 17 is lower than a predetermined value, the main liquid tank liquid-outlet regulating valve 24 and the coagulation liquid tank liquid-outlet regulating valve 25 are closed.

At this time, the residual liquid in the gel foam injection device 27 needs to be further discharged to avoid clogging. For this purpose, for example, the on-off valve 273 of the gel foam injection device 27 may be opened and the foaming device 26 may be continuously supplied with air, for example, by the compressed air source 1, to discharge the residual liquid product in the gel foam injection device 27. In addition, if desired, the relief valves 22 on the main tank 16 and the coagulant tank 17 may be opened to relieve the residual pressure therein.

The mixture of foam solution and gelling agent in the main tank 16 and the promoting fluid in the coagulant tank 17 may be delivered to the foaming device 26 and the gel foam spraying device 27 in a number of suitable ways, for example by pumping under pressure by means of a delivery pump. In one embodiment, a higher air pressure is established by introducing compressed air (second compressed air and third compressed air) into the main tank 16 and the coagulation accelerator tank 17 to deliver a mixture of the foaming solution and the gelling agent and the coagulation accelerator under this air pressure. Thus, the mixed liquid of the foaming solution and the gelling agent can be rapidly fed to the foaming device 26, and a large amount of foam is generated in the foaming chamber 26a, and the gelling agent can be sufficiently mixed with the foam at the gel foam injection device 27.

Accordingly, the gel foam generating method of the present application may include a pressurized pre-mixing step S0 performed before the foaming step S1, the pressurized pre-mixing step S0 including a pressurized sub-step: the second compressed gas is introduced below the liquid level in the main tank 16 until the air pressure in the main tank 16 reaches a preset pressure, and in the foaming step S1 and the gel foam spraying step S2, the mixed liquid of the foam solution and the gelling agent in the main tank 16 can be conveyed to the foaming chamber 26a under the action of the air pressure, and/or the third compressed gas is introduced into the coagulation accelerator tank 17 until the air pressure in the coagulation accelerator tank 17 reaches a preset pressure, and in the gel foam spraying step S2, the coagulation accelerator liquid in the coagulation accelerator tank 17 can be conveyed to the gel foam spraying device 27 under the action of the air pressure. By introducing the second compressed gas below the liquid surface in the main tank 16, the water, fire-extinguishing foam liquid and gelling agent in the main tank 16 can be fully premixed by convection movement, and foam is primarily generated. For this purpose, the outlet end of the gas line for supplying compressed gas into the main tank 16 may also be provided with a porous outlet pipe 18. Furthermore, the liquid inlet end of the liquid line for supplying the foaming device 26 and the gel foam injection device 27 may be provided with a filter unit 19, such as a corrosion-resistant mesh tube.

The first, second and third compressed gases may be from the same compressed gas source 1 or different compressed gas sources, which may be the same or different non-combustible gases. In the illustrated embodiment, the same compressed air source 1 is connected by air supply lines to the foaming device 26, to the main tank 16 and to the coagulation accelerator tank 17, so as to be able to selectively supply compressed air. For this purpose, the gas supply line may be provided with detection and/or control elements, such as a compressed gas source pressure gauge 2, a compressed gas total on-off valve 3, a pressure reducing and regulating valve 4, a gas distributor 5, etc. The pressure reducing and regulating valve 4 is arranged to be able to reduce the pressure to a pressure suitable for foaming and delivering liquid (e.g. about 0.8 MPa) when the supply pressure of the compressed air source 1 is high (e.g. greater than 0.8 MPa). The gas distributor 5 may be provided as a four-way valve and is connected to the foaming device 26, the main tank 16 and the coagulation accelerator tank 17 by a plurality of branch gas paths. The branch gas paths corresponding to the foaming device 26, the main liquid tank 16 and the coagulation liquid tank 17 can be respectively provided with a foaming gas supply regulating valve 5.1 (such as a valve with adjustable flow such as a needle valve), a coagulation liquid tank gas supply valve 5.2 and a main liquid tank gas supply valve 5.3.

In the case of delivering the mixed solution of the foaming solution and the gelling agent and the accelerating liquid by the gas pressure, the main liquid tank 16 and the accelerating liquid tank 17 may be provided with a safety valve 20, a pressure relief valve 22, a reservoir pressure gauge 21 and the like which are matched with safety and detection devices. Wherein the safety valve 20 can be used to have a set pressure slightly higher than the system operating pressure, such as 1MPa-1.2MPa, when this set pressure is reached, the main tank 16 or the coagulation tank 17 is correspondingly depressurized, to prevent the safety risk caused by the internal pressure being too high.

The fire extinguishing raw materials such as water, a gelling agent, a coagulant, etc. do not need to be stored in the main tank 16 and the coagulant tank 17 before the disaster has occurred, or when the liquid levels in the main tank 16 and the coagulant tank 17 are low, the fire extinguishing raw materials need to be filled therein. To this end, the gel foam generating system may further comprise a water adding module, a foam concentrate adding module and a gel forming agent adding module for respectively injecting water, foam concentrate and gel forming agent into the main tank 16, and a setting accelerator adding module for injecting setting accelerator into the setting accelerator tank 17.

In the illustrated embodiment, the water adding module includes a water supply source 6, which may be a water tank, fire hydrant, or the like; the foam stock solution filling module comprises a fire-extinguishing foam solution box 7, and can be provided with A-type or B-type fire-extinguishing foam solution according to requirements; the gellant filling module comprises a gellant storage cartridge 8 in which a gellant, for example water glass, is stored; the accelerator filling module comprises an accelerator storage cartridge 9 in which stored accelerator may be used to promote sol-gel reactions of the gelling agent to form a gel. The water, foam concentrate, gellant and coagulant may be pumped by water pump 10, foam pump 11, gellant pump 12 and coagulant pump 13, respectively, into main tank 16 or coagulant tank 17, which are preferably corrosion resistant pump bodies such as diaphragm pumps. A main tank supply valve 14 may be provided on the filling line to the main tank 16 and a set-accelerator tank supply valve 15 may be provided on the filling line to the set-accelerator tank 17, the valve cartridge and valve chamber of which are preferably made of or treated with a corrosion resistant material.

Accordingly, in the gel foam generating method of the present application, the pressurizing premix step S0 further includes a liquid charging sub-step performed before the pressurizing sub-step: injecting water into the main liquid tank 16, injecting foam stock solution and a gelling agent into the main liquid tank 16, and injecting water into the main liquid tank 16 again, wherein a flow path of the water injected into the main liquid tank 16 at least partially overlaps with a flow path of the foam stock solution and the gelling agent, and the water injection is performed again after the foam stock solution and the gelling agent are injected, so that a liquid supply pipeline can be flushed to reduce residual foam solution and the gelling agent, and the pipeline is prevented from being blocked by gel after long-time non-use; and/or the coagulant liquid is injected into the coagulant liquid tank 17, the liquid amount in the coagulant liquid tank 17 is monitored in real time, and the injection speed is reduced in the injection process, for example, by reducing the pump speed or the valve opening, so that whether the filling amount reaches the set weight or not can be monitored by using the weighing unit 23, and the influence on the filling accuracy due to impact is reduced.

More specifically, in the filling substep, the foam air supply regulating valve 5.1, the coagulant tank air supply valve 5.2, the main tank air supply valve 5.3 and the on-off valve 273 of the gel foam injection device 27 may be closed first (it is generally recommended that the compressed air main on-off valve 3 be closed, the halfway filling may not be closed), the pressure release valve 22 be opened, the readings of the tank pressure gauge 21 are ensured to be 0, and the main tank air supply valve 14 and the coagulant tank air supply valve 15 are opened.

The coagulant pump 13 is started when the coagulant is filled, the reading of the weighing cell 23 corresponding to the coagulant tank 17 is monitored, and the coagulant pump 13 is stopped and the coagulant tank supply valve 15 is closed when the set weight is reached. In the process, an automatic control scheme can be adopted, and the pump speed of the coagulant pump 13 or the valve opening of the coagulant tank liquid supply valve 15 can be gradually reduced according to a PID control algorithm so as to reduce the influence of impact on liquid feeding precision.

When the mixed liquid is filled, the water pump 10 is started, and when the weighing unit 23 corresponding to the main liquid tank 16 detects that the water adding amount reaches the set quality Ma, the water pump 10 is stopped; then, the gellant pump 12 is started, and the gellant pump 12 is stopped when the mass of the main tank 16 reaches Mb; then, the foam liquid pump 11 is started, and the foam liquid pump 11 is stopped after the mass of the main liquid tank 16 reaches Mc; finally, the water pump 10 is started again, and after the mass reaches the set mass Md, the main tank supply valve 14 is stopped and closed. By supplying water twice, the liquid supply pipeline can be flushed to reduce residual foam liquid and gelling agent, so as to avoid gel blocking the pipeline after long-time non-use.

After filling is completed, the pressure release valves 22 on the main liquid tank 16 and the coagulation liquid tank 17 are closed to seal the tank body, and then the sub-step of pressurizing is carried out.

The gel foam generating method and the gel foam generating system of the application spray the gel foam rapidly and efficiently through premixing the foam solution and the gelling agent, foaming the mixed solution in the foaming device, mixing the foam containing the gelling agent and the coagulant in the gel foam spraying device and sol-gel reaction, thus realizing good fire extinguishing and isolating effects. Wherein the foaming device and the gel foam spraying device can be arranged in a plurality of suitable forms, the preferred modes of which are exemplified below with reference to the accompanying drawings:

Foaming device 26

Referring to fig. 2 to 4, a foaming device applied to the gel foam generating method and the gel foam generating system of the present application includes a foaming chamber 26a, a liquid dispersion plate 263, a mixed liquor inlet passage 26b, and a plurality of compressed gas jet passages 26c.

Specifically, the dispersion plate 263 is disposed in the foaming chamber 26a, the mixed solution inlet channel 26b is communicated with the foaming chamber 26a, and the mixed solution of the foam solution and the gelling agent (for example, the inorganic salt sol foaming solution can be prepared by mixing multiple solutions such as inorganic salt sol solution, composite foaming agent, foam stabilizer, flame retardant, antifreeze agent, etc., and has the characteristics of easy foaming and long foam stabilizing time) can be sprayed out towards the dispersion plate 263 under the guiding action of the mixed solution inlet channel 26 b. In addition, a plurality of compressed gas jet channels 26c are sequentially arranged at intervals around the mixed liquid inlet channel 26b and are respectively communicated with the foaming chamber 26a, and compressed gas (such as non-combustible gas of air, nitrogen and the like) can form a plurality of jet streams through the plurality of compressed gas jet channels 26c to be injected into the foaming chamber 26a.

When the mixed solution of the foam solution and the gelling agent is scattered into liquid drops due to impacting the dispersion plate 263, a plurality of compressed gas jet flows can form turbulence in the foaming cavity 26a, generate strong disturbance, and are coated by a liquid film to form bubbles, so that foaming is finished, and the silicate mixed foaming liquid with higher viscosity also has higher foaming multiple (the foaming multiple is more than or equal to 6). Therefore, the application range of the gel extinguishing agent can be greatly expanded, so that the gel extinguishing agent is not limited to be applied to few extinguishing scenes such as coal extinguishing and the like, but can also be applied to complicated fire sites such as high-rise building fires, forest fires, chemical raw material fires, forest isolation zones and the like.

Because the compressed gas jet channels 26c are sequentially and alternately arranged around the mixed liquid inlet channel 26b, in order to further improve the foaming speed and fully utilize the space of the foaming cavity, the end face of the liquid dispersing disc 263 facing the mixed liquid inlet channel 26b can be set to be a liquid dispersing guiding conical surface, and when the mixed liquid of the foam solution and the gelling agent impacts the liquid dispersing guiding conical surface, part of liquid drops can be dispersed along the liquid dispersing guiding conical surface, so that compressed gas jet is coated more quickly and widely, and a large amount of foam is formed instantly.

In addition, the foaming device is further provided with a foam output channel 26d communicated with the foaming cavity 26a, and a liquid dispersing plate 263 can be arranged between the foam output channel 26d and the mixed liquid inlet channel 26b so as to prevent the mixed liquid of the foam solution and the gelling agent from being directly sprayed out. Because the liquid dispersion plate 263 needs to block the mixed liquid of the foam solution and the gelling agent, the outer periphery of the liquid dispersion plate 263 and the inner periphery of the foaming cavity 26a are preferably utilized to define a foam circulation area for the foam to pass through, and if the setting of the liquid dispersion guiding conical surface is combined, the foam can be formed more quickly and in a larger range, and is also concentrated in the radial peripheral area of the foaming cavity 26a in a large quantity and is close to the foam circulation area, so that the foam can be discharged from the foam output channel 26d through the foam circulation area at a higher speed, the foaming device has a higher response speed, and the fire emergency requirement for competing for seconds is met.

The specific manner in which the outer peripheral edge of the liquid dispersion plate 263 and the inner peripheral wall of the foaming chamber 26a define the foam flow area is not limited. For example, the maximum outer diameter of the liquid dispersion plate 263 may be set smaller than the inner diameter of the foaming chamber 26a, leaving a foam circulation area. Alternatively, referring to fig. 3, a plurality of liquid dispersion disk notches (not shown) may be formed in the outer periphery of the liquid dispersion disk 263 at intervals in the circumferential direction, and the flow area defined by the plurality of liquid dispersion disk notches may be at least a part of the foam flow area.

Further, the air outlet ends of the compressed air jet channels 26c can be correspondingly arranged towards the notches of the liquid dispersing discs, so that strong air pressure is formed near the notches of the liquid dispersing discs, and the speed of foam passing through the notches of each liquid dispersing disc is further improved.

On the other hand, the mixed liquor feed passage 26b and the plurality of compressed gas jet passages 26c may be provided in the same or different components. For example, in the embodiment shown in fig. 2 to 4, the mixed liquor feed channel 26b and the plurality of compressed gas jet channels 26c are integrated in the mixed liquor nozzle 264, and the mixed liquor nozzle 264 has the combined action of injecting the mixed liquor of the foam solution and the gelling agent and the compressed gas jet, so that the number of components of the foaming device can be reduced, the foaming device is lighter, the fire rescue equipment applied by the foaming device is correspondingly lighter, the foaming device is easier to assemble, and the production cost is saved.

Furthermore, the present application is not limited to the particular manner in which the compressed gas jet passage 26c introduces the compressed gas. For example, multiple compressed gases may be directed from the compressed gas source 1 using separate lines and directed into the multiple compressed gas jet channels 26c to form multiple jets.

Still alternatively, the following arrangement may be made with reference to the embodiments shown in the drawings:

Specifically, the foaming device further includes a housing provided with a compressed gas inlet 26f at a peripheral wall thereof, a foaming chamber 26a being formed in a housing chamber of the housing, and a mixed liquid nozzle 264 being installed in the housing chamber. Further, the mixed liquid nozzle 264 has an annular boss portion 2641, a mixed liquid inlet passage 26b is formed at least partially in the mixed liquid nozzle 264 and has a tapered through-flow sectional area at an end toward the foaming chamber 26a, the annular boss portion 2641 divides the shell chamber into an annular air chamber 26e and the foaming chamber 26a, and a plurality of compressed gas jet passages 26c are formed on the annular boss portion 2641. Thereby, the annular air chamber 26e communicates the compressed air inlet 26f with the plurality of compressed air jet passages 26c.

Through the arrangement, the compressed gas firstly enters the annular air cavity 26e from the compressed gas inlet 26f, the strong air pressure is formed in the annular air cavity 26e, the whole air cavity area is rapidly distributed, the compressed gas reaches the inlet end of each compressed gas jet channel 26c at a relatively high speed, and preliminary uniform distribution of the compressed gas is realized. When the compressed gas in the annular air chamber 26e enters the compressed gas jet passage 26c, the flow velocity increases rapidly due to the rapid decrease in the flow area, so that a high-speed jet can be formed in the compressed gas jet passage 26 c.

Further, the mixed liquid nozzle 264 and the liquid dispersion plate 263 may be coaxially arranged at intervals such that the liquid outlet end of the mixed liquid nozzle 264 is aligned with the center of the liquid dispersion plate 263, while the liquid outlet end of the mixed liquid nozzle 264 is arranged to extend into the foaming chamber 26a, and the outer peripheral wall surface of the liquid outlet end of the mixed liquid nozzle 264 is arranged as a jet guiding cone. In this way, when the high-speed jet flows through the compressed gas jet channel 26c on the annular boss portion 2641 and enters the foaming cavity 26a with the suddenly increased flow area, the jet rapidly spreads near the air outlet end of the compressed gas jet channel 26c, and part of the jet close to the jet guiding conical surface can be guided to the radial middle area of the foaming cavity 26a by the jet guiding conical surface, so that the jet can form turbulence not only in the radial peripheral area of the foaming cavity 26a, but also in the radial middle area, and the radial middle area can rapidly form foam.

In addition, the foaming device may further include a plurality of struts 265, where the plurality of struts 265 are respectively connected to the liquid dispersing plate 263 and are sequentially arranged at intervals along the circumferential direction of the liquid dispersing plate 263. Through with the one end butt in the shell cavity of shell along axial one end wall, with the other end butt in annular boss portion 2641 of pillar 265 to and with the one end butt in the other end wall along axial of shell cavity of the liquid dispersion dish 263 that keeps away from of mixed liquor nozzle 264, can compact, firmly install liquid dispersion dish 263 and mixed liquor nozzle 264 in the shell cavity, guarantee that mixed liquor nozzle 264 still can remain stable when spraying foaming liquid and liquid dispersion dish 263 is impacted by the foaming liquid, make foaming device have higher reliability, be difficult for inefficacy, and this compact mounting structure can shorten foaming device's axial dimension, foaming device lighter.

The housing of the aforementioned foaming device may include a first housing part 261 and a second housing part 262 detachably butted in an axial direction, in which case the mixed liquid nozzle 264 may be disposed in the first housing part 261, the compressed gas inlet 26f may be disposed in a peripheral wall of the first housing part 261, and the foaming chamber 26a may be formed in the second housing part 262. The detachable shell structure can facilitate the installation, disassembly and replacement of components in the shell cavities such as the liquid dispersing disc 263, the mixed liquid nozzle 264 and the like. The first housing portion 261 and the second housing portion 262 may be assembled, for example, as illustrated by flange connections.

The foaming device 26 in the embodiment shown in fig. 2 to 4 adopts the foaming principle that the mixed solution of the foaming solution and the gelling agent is dispersed first, and the generated liquid film is used for coating the compressed gas to form the foam. However, the specific embodiment of the foaming device 26 of the present application is not limited thereto, and for example, the foaming device 26 may employ a foaming principle in which a mixed liquid of a foaming solution and a gelling agent and a compressed gas are premixed and then the premixed fluid is dispersed into foam.

Gel foam spraying device 27

As shown in fig. 5 to 15, a gel foam injection apparatus applied to the gel foam generating method and the gel foam generating system of the present application includes a feeding chamber 27e having a ring shape, a preliminary mixing chamber 27h, a mixed foam inlet 27a, a coagulation accelerator outlet 27d, and a gel foam nozzle 277. The mixed foam inlet 27a communicates with the feed chamber 27e and serves to convey the foam output by the foaming device toward the feed chamber 27e, and the coagulation accelerator outlet 27d communicates with the preliminary mixing chamber 27h and serves to convey the coagulation accelerator toward the preliminary mixing chamber 27 h. The preliminary mixing chamber 27h is provided with a discharge port, and the gel foam nozzle 277 is provided axially forward of the preliminary mixing chamber 27h and is used for ejecting gel foam output from the discharge port. So, through setting the shape of the feeding cavity 27e of the gel foam injection device to be annular, the mixing contact area of the condensation promoting liquid and the mixed foam liquid is higher, the turbulence intensity is higher, the gel reaction time is greatly shortened, the generated gel foam is finer, and the gel foam can effectively realize the effects of cooling, isolation and burning resistance on the fire scene, and has the effects of rapidly extinguishing fire and isolating fire for a long time.

Moreover, under the same sectional area, the annular section is higher than the circular section in mixing contact area, and the turbulence intensity is higher, so that the annular feeding cavity 27e can enable the gel foam to be generated more efficiently, and the injection device is beneficial to realizing miniaturization and portability and is suitable for complex emergency fire sites such as high-rise building fires, forest fires, industrial chemicals fires, forest isolation belts and the like.

In addition, the discharge gate sets up at the axial front end of feed cavity 27e, and the annular opening of axial front end that will feed cavity 27e is as the discharge gate, and annular discharge gate discharge area is great relatively for be difficult for blockking up the discharge gate because of the initial gel group that short-term stops to spray and lead to, be favorable to improving injection apparatus's reliability.

It should be noted that, the peripheral wall of the feeding chamber 27e and the preliminary mixing chamber 27h may have various structures, for example, may be formed by assembling a plurality of components, or may be formed by an integrally formed structure. In addition, the positions and the number of the mixed foam inlet 27a and the coagulation accelerator outlet 27d may be varied, for example, the mixed foam inlet 27a may be provided on the inner peripheral wall or the outer peripheral wall of the feed chamber 27e, and the coagulation accelerator outlet 27d may be provided on the inner peripheral wall or the outer peripheral wall of the preliminary mixing chamber 27 h; or the mixed foam inlet 27a and the coagulation accelerator outlet 27d may be provided on the inner peripheral wall or the outer peripheral wall of the feed chamber 27 e; or the mixed foam inlet 27a and the setting accelerator outlet 27d may be provided at the same or different circumferential positions; alternatively, one or more of the mixed foam inlet 27a and the accelerator outlet 27d may be provided, respectively.

In some embodiments, as shown in fig. 5-15, the gel foam injection apparatus may include a feed cylinder 271 and a feed core 272, the feed core 272 being disposed through a cylinder cavity of the feed cylinder 271, the cylinder cavity of the feed cylinder 271 including a feed cavity 27e and a preliminary mixing cavity 27h. An annular feed chamber 27e is formed between the outer peripheral wall of the feed core 272 and the inner peripheral wall of the feed cylinder 271. The mixed foam inlet 27a is provided in one and formed on the wall of the feed cylinder 271, the liquid inlet flow passage 27b, the coagulation accelerator inlet 27c and the coagulation accelerator outlet 27d are formed on the feed core 272, the coagulation accelerator inlet 27c and the coagulation accelerator outlet 27d are respectively communicated to the liquid inlet flow passage 27b, the mixed foam inlet 27a is communicated to the feed chamber 27e, and the coagulation accelerator outlet 27d is communicated to the preliminary mixing chamber 27h.

The small-dose condensation promoting liquid is injected into the preliminary mixing cavity 27h from the feeding core 272 positioned in the middle, the large-dose mixed foam liquid is injected into the feeding cavity 27e from the wall of the feeding cylinder 271 and enters the preliminary mixing cavity 27h after turbulent flow, and the mode that the large-dose fluid is mixed with the small-dose fluid after turbulent flow can further ensure that the mixing contact area of the coagulation promoting liquid and the mixed foam liquid is higher, the turbulent flow intensity is higher, the gel reaction time can be further shortened, and the generated gel foam is finer.

Further, the feed cylinder 271 may be provided in a hollow cylindrical shape, with the feed core 272 inserted into the feed cylinder 271 from the cylinder cavity rear end opening of the feed cylinder 271, and closing the cylinder cavity rear end opening of the feed cylinder 271. The coagulation accelerator inlet 27c is provided at the axially rear end of the feed core 272, and the feed liquid flow passage 27b is arranged axially and coaxially with the feed core 272.

Alternatively, the coagulation accelerator outlet 27d is provided in plurality and equally spaced circumferentially on the peripheral wall of the feed core 272, and is located axially forward of the feed core 272. Also, in order to make the structure of the spraying device more reasonable and reliable, the feed core 272 may be arranged coaxially with the feed cylinder 271 and/or the cylinder cavity of the feed cylinder 271.

The diameter of the coagulation accelerator outlet 27d may be set to be greater than or equal to 1mm and less than or equal to 5mm, so that the coagulation accelerator outlet 27d is not only convenient to process and not easy to be blocked, but also ensures that the injection flow rate of the coagulation accelerator in the coagulation accelerator outlet 27d is proper, and improves the mixing effect of the coagulation accelerator and the mixed foam.

In some embodiments, to further enhance the turbulent flow of the mixed foam liquid in the feed chamber 27e, as shown in fig. 7 and 8, the central axis of the mixed foam inlet 27a may be radially offset from the central axis of the feed chamber 27e to be in a non-planar arrangement, i.e., such that the central axis of the mixed foam inlet 27a is offset from the central axis of the feed chamber 27e by a distance S, thereby imparting a swirling flow to the mixed foam liquid. Alternatively, the central axis of the mixed foam inlet 27a may be spaced from the central axis of the feed chamber 27e by 5mm or more and 40mm or less.

Further, in order to enhance the swirling effect, the central axis of the mixed foam inlet 27a may be disposed perpendicular to the central axis of the feed chamber 27e in a different plane.

Further, the central axis of the mixed foam inlet 27a may be tangential to the peripheral wall of the feed chamber 27e, so that the swirling effect of the mixed foam liquid is stronger.

Optionally, because of the difference between the output flow rates of the mixed foam liquid and the coagulation promoting liquid, in order to further improve the mixing effect of the mixed foam liquid and the coagulation promoting liquid and improve the generating efficiency of the gel foam, the structures of the feeding cavity 27e and the primary mixing cavity 27h may be further optimally designed. As shown in fig. 6, the coagulation accelerator outlet 27d is located in front of the mixed foam inlet 27a in the axial direction of the feed chamber 27 e. Because the output flow of the mixed foam liquid is relatively large, and the output flow of the coagulation promoting liquid is relatively small, if the cross-sectional area of the feeding cavity 27e is too small, the circulation effect of the mixed foam liquid is not obvious, and if the cross-sectional area of the primary mixing cavity 27h is too large, the flow velocity of the coagulation promoting liquid is low, so that the outflow of the coagulation promoting liquid is not facilitated. For this reason, the cross-sectional area of the feeding cavity 27e can be set to be larger than that of the primary mixing cavity 27h, so that the feeding cavity 27e with a large cross-sectional area is beneficial to circulation of mixed foam liquid, and the primary mixing cavity 27h with a small cross-sectional area can improve the flow velocity of the accelerating liquid, so that the feeding structure is more reasonable, and the mixing effect of mixed foam liquid and the accelerating liquid is better.

Wherein, as shown in fig. 6, in order to realize that the cross-sectional area of the feeding chamber 27e is set to be larger than that of the preliminary mixing chamber 27h, the outer circle diameter of the feeding chamber 27e may be set to be larger than that of the preliminary mixing chamber 27h, and the annular width of the feeding chamber 27e is larger than that of the preliminary mixing chamber 27 h.

In addition, the reasonable setting of the cross-sectional area of the feeding cavity 27e is also important, if the cross-sectional area of the feeding cavity 27e is too small, the pressure loss will be high when the mixed foam liquid is injected, and the jet velocity of the mixed foam liquid is too low when the mixed foam liquid is injected under the same total pressure, and the jet range is too short. If the cross-sectional area of the feed chamber 27e is too large, the mixing effect of the mixed foam liquid and the accelerating liquid is poor. For this reason, the ratio of the inner diameter to the outer diameter of the feed chamber 27e may be set to 0.7 or more and 0.99 or less, so that the cross-sectional area of the feed chamber 27e can be made appropriate, ensuring sufficient mixing of the mixed foam liquid and the coagulation accelerator liquid.

In addition, as shown in fig. 6, the coagulation accelerator outlet 27d is located at the axial rear end of the preliminary mixing chamber 27h, and along the discharging direction of the discharging port of the feeding chamber 27e, the cross-sectional area of the preliminary mixing chamber 27h is gradually increased, that is, the feeding chamber 27e and the preliminary mixing chamber 27h together form a discharging structure which is contracted before being expanded, so that the pressure of the mixed solution is reduced when the mixed solution is accelerated to pass through the axial front end of the preliminary mixing chamber 27h, and the coagulation accelerator can be better ejected by utilizing the venturi effect, thereby being beneficial to promoting the coagulation solution to enter the front mixing chamber. Wherein, in order to achieve the setting of the cross-sectional area of the preliminary mixing chamber 27h to be gradually increased toward the front, as shown in fig. 6, the outer diameter of the portion of the feed core 272 between the coagulation accelerator outlet 27d and the discharge port may be set to be gradually decreased toward the front.

Since the injection device stops injecting after the switch valve 273 is closed, the injection of the coagulant is stopped, and when the injection pressure of the coagulant is equal to or less than the external fluid pressure, the foam liquid mixed with the coagulant may flow back into the coagulant injection structure under the action of pressure fluctuation (water hammer effect) to cause clogging.

In order to further effectively prevent the deposition and blockage of gel foam, the application further optimizes the primary mixing structure of the foam gel mixture and the condensate. Specifically, as shown in fig. 12 to 15, the coagulation-accelerating liquid outlet 27d may be provided in one piece and located on the axially front end face of the feed core 27e, and the spraying device further includes a slotted plug 281, a support assembly, and an elastic member 282. A slotted plug 281 is provided in the preliminary mixing chamber 27h, and an axial rear end of the slotted plug 281 plugs the coagulation accelerator outlet 27d. The support component is arranged on the cylinder wall of the feeding cylinder 271 and is positioned at the axial front of the slotted plug 281, and the elastic piece 282 is abutted between the slotted plug 281 and the support component, so that the axial rear end of the slotted plug 281 can be pressed on the coagulation accelerator outlet 27d by the elastic force of the elastic piece 282, and the gap between the slotted plug 281 and the coagulation accelerator outlet 27d is equal to 0, so that backflow is prevented.

In addition, to further improve the smoothness of the discharge of the condensate, the support assembly can adjust the axial connection position of the support assembly on the cylinder wall of the feeding cylinder 271, that is, the initial compression amount of the elastic member 282 is changed by connecting different axial positions of the cylinder wall of the feeding cylinder 271, so as to change the flow rate of the condensate.

Specifically, in view of the fact that the flow rate of the coagulant is also much smaller than that of the foam liquid, the gap x between the slotted plug 281 and the coagulant outlet 27d is required to be much smaller than the diameter of the coagulant outlet 27d, and according to the stress balance, the gap x has the following relationship with the coagulant injection pressure Pc and the foam liquid pressure Pp in the initial mixing chamber:

k×(Δx₀+x)≈(P_c-P_p)×A

When the initial compression amount Δχ ₀ of the elastic member 282 is the gap x=0, the compression amount of the elastic member 282; k is the spring rate of the elastic member 282; a is a coefficient related to the structural dimensions of the slotted plug 281 and to the diameter d of the setting accelerator outlet 27 d.

It is evident that at a certain moment the pressure at each location is instantaneously constant, the gap x is positively correlated with Δx ₀, and the coagulation promoting flow q _c satisfies the bernoulli's theorem:

q_c＝C×x×π×d

where C is a coefficient (instantaneous invariant) related to the coagulant injection pressure and the foam pressure at the gap location, the coagulant flow q _c is positively correlated to the initial compression Δx ₀, i.e., the initial compression Δx ₀ of the spring 282 is varied by adjusting the relative axial position of the support assembly and the feed cylinder 271, thereby adjusting the coagulant flow.

Optionally, the support assembly includes an adjustment transition 283 threadably coupled to the wall of the feed cylinder 271 and a support base 284, the support base 284 abutting between the adjustment transition 283 and the resilient member 282. By rotating the threaded connection position of the adjustment transition piece 283 with the feed cylinder 271, the initial compression amount Δx0 of the elastic member 282 can be changed, thereby adjusting the flow rate of the condensate.

Specifically, as shown in fig. 8, 9, 10 and 11, the outer circumferential wall of the feed cylinder 271 is stepped, the outer diameter of the axially front end outer circumferential wall of the feed cylinder 271 is smaller than the outer diameter of the axially rear end outer circumferential wall, and the axially front end outer circumferential wall of the feed cylinder 271 is provided with external threads. The adjustment transition piece 283 has a hollow stepped cylindrical cavity, an axially rear end inner peripheral wall of the adjustment transition piece 283 is provided with an internal thread, and a diameter of an axially front end inner peripheral wall of the adjustment transition piece 283 is smaller than that of the axially rear end inner peripheral wall, so that annular bearing platform parts are formed on the axially front end inner peripheral wall and the axially rear end inner peripheral wall, and an axially front end part of the support base 284 can abut against the annular bearing platform parts to limit.

In addition to the above-described structure, the screw connection structure between the support member and the feed cylinder 271 may be, for example, an inner screw provided on an inner circumferential wall of an axial front end of the feed cylinder 271, an outer screw provided on an outer circumferential wall of an axial front end of the adjustment transition piece 283, and an axial front end portion of the support base 284 abutting against an axial rear end surface of the adjustment transition piece 283 to limit the position. In addition, in addition to adjusting the connection position between the support member and the feed cylinder 271 by screw connection, for example, the feed cylinder 271 and the support member may be provided in a piston structure, and the position may be locked by providing a locking structure, etc., to which the present application is not limited.

Alternatively, as shown in fig. 8, 9, 10 and 11, the support base 284 includes a front abutment rod at the axial front end and a stopper at the axial rear end, the stopper having a diameter larger than that of the front abutment rod and being provided with a plurality of through-flow passages arranged at intervals in the circumferential direction, the through-flow passage walls extending in the axial rear direction to form cutting blades. The grooving plug 281 comprises a rear supporting rod, a limiting ring platform and a plugging plunger which are sequentially connected from front to back along the axial direction, the diameter of the limiting ring platform is larger than that of the rear supporting rod and that of the plugging plunger, and a guide tip is arranged at the axial rear end of the plugging plunger. The elastic piece 282 is a spring, and two ends of the spring are respectively sleeved on the rear supporting rod and the front supporting rod and respectively abutted on the limiting ring platform and the limiting part.

Further, in order to ensure more sufficient mixing and gel reaction of the mixed foam and the setting accelerator and to break up the initial gel mass caused by the short stop of the spraying, as shown in fig. 5, the gel foam spraying apparatus may further include a mixing pipe 274 disposed axially forward of the feeding cylinder 271, the pipe cavity of the mixing pipe 274 including a stirring and mixing chamber 27f, the stirring and mixing chamber 27f being in communication with the preliminary mixing chamber 27h, and a stirring and mixing assembly 275 being provided in the stirring and mixing chamber 27 f. Thus, the gel foam mixture can be fully impacted and stirred by fluid, so that the foam is finer and the gel is more uniform. Wherein the agitation mixing assembly 275 may include at least one of SK-type positive and negative helical agitating blades including positive and negative helical agitating blades alternately arranged in an axial direction of the agitation mixing chamber 27f, standard SY-type mixer blades, SD-type mixer blades, baffles, and a bar. The baffle can be provided with a plurality of staggered baffles, and the baffle rods can be axially arranged at intervals and form included angles with each other.

Still further, as shown in FIG. 5, the lumen of the mixing tube 274 may further include a rectification chamber 27g, the rectification chamber 27g being located axially forward of the agitation mixing chamber 27f and communicating with the agitation mixing chamber 27f. The rectifying chamber 27g is provided therein with a rectifying assembly 276, and the rectifying assembly 34 is formed with a plurality of rectifying flow passages arranged in parallel in the axial direction. The fairing assembly 276 may include a plurality of circumferentially spaced flat blades extending in the discharge direction of the fairing chamber 27g, or as shown in fig. 9, 10 and 11, the fairing assembly 34 may include a plurality of barrel sections with barrel walls connected to each other, and a plurality of fairing flow passages axially disposed in parallel. In this way, the swirling flow caused by the stirring and mixing assembly 275 can be prevented from over-dispersing the outgoing foam, and the outgoing foam flow can be smoother, so that the outflow range and impact force of the gel foam are enhanced, and the penetration of the fire can be facilitated.

Alternatively, to facilitate securing the position of the agitator mixing assembly 275 and the fairing assembly 276, as shown in fig. 5 and 6, the fairing assembly 276 has a central shaft extending axially rearward with an axially rearward end of the central shaft connected to the agitator mixing assembly 275.

In some embodiments, as shown in fig. 5, the gel foam nozzle 277 is connected to the axial front end of the mixing pipe 274 and has an injection cavity therein, the injection cavity is communicated with the rectification cavity 27g, and the axial front end of the injection cavity is provided with an injection port and is in a convergent shape along the injection direction, so that the injection effect of the gel foam is better.

Alternatively, as shown in fig. 5, the injection apparatus may further include an on-off valve 273, the on-off valve 273 being connected between the mixing pipe 274 and the feed cylinder 271. The on-off valve 273 can be operated to communicate or shut off the communication relationship between the preliminary mixing chamber 27h and the agitation mixing chamber 27f, so that the gel foam injection device can be controlled to be in an on-off state by the on-off valve 273 and/or the injection amount of the injection device can be controlled by the on-off valve 273. The on-off valve 273 may be a ball valve, a conical valve, or the like, and the structure for opening and closing the on-off valve 273 or adjusting the flow is well known to those skilled in the art, and will not be described herein.

The gel foam injection device effectively forms high turbulence by the converging mode that the coagulation promoting liquid is injected from the central part and the mixed foam liquid is injected from the outer vertical central axis, and the mixed foam inlet and the central axis of the feeding cavity are provided with offset structures. In addition, the mixing cavity adopts a positive and negative spiral mixing mode, so that gel foam is finer and smoother, and gel is more uniform; meanwhile, the rectifying component is added in the rectifying cavity, so that gel foam flows smoothly, the outflow range and the impact force are enhanced, and the fire extinguishing penetration is facilitated.

The above describes in detail the optional embodiments of the present invention with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, a number of simple variants of the technical solution of the invention are possible, including combinations of individual specific technical features in any suitable way. The various possible combinations of the invention are not described in detail in order to avoid unnecessary repetition. Such simple variations and combinations are likewise to be regarded as being within the scope of the present disclosure.

Claims

1. A gel foam generating method, comprising:

S1, a foaming step, namely respectively introducing a first compressed gas and a mixed solution of a foam solution and a gelling agent into a foaming cavity (26 a) of a foaming device (26), so that the mixed solution of the foam solution and the gelling agent generates and outputs foam under the disturbance action of the first compressed gas;

S2, gel foam spraying, namely respectively introducing the condensate and the foam output by the foaming device (26) into a gel foam spraying device (27), so that the condensate and the foam are mixed in the gel foam spraying device (27) and then sprayed outwards.

2. The gel foam generating method according to claim 1, characterized in that the first compressed gas and the mixed liquid of the foam solution and the gelling agent are continuously introduced into the foaming chamber (26 a) so that the foam generated by the foaming device (26) is introduced into the gel foam injection device (27) by the first compressed gas, and the foaming step S1 and the gel foam injection step S2 are successively performed.

3. The gel foam generating method according to claim 1, wherein the mixed liquid of the foam solution and the gelling agent is stored in a main liquid tank (16), and the foaming step S1 further includes: monitoring the mass change rate of the main liquid tank (16) and controlling the flow rate of the mixed liquid of the foam solution and the gelling agent which is introduced into the foaming cavity (26 a) by the main liquid tank (16) according to the mass change rate;

and/or the coagulation accelerator is stored in a coagulation accelerator tank (17), the gel foam spraying step S2 further comprising: the rate of change of mass of the coagulation liquid tank (17) is monitored and the flow of coagulation liquid from the coagulation liquid tank (17) into the gel foam injection device (27) is controlled in accordance with the rate of change of mass.

4. A gel foam generating method according to claim 3, characterized in that the main tank (16) and/or the coagulation accelerator tank (17) are mounted on a weighing unit (23); the gel foam generating method further comprises: the corresponding mass change rate is obtained by monitoring the mass change of the main tank (16) and/or the coagulation accelerator tank (17) in a set time period through the weighing unit (23).

5. A gel foam generating method according to claim 3, wherein a main tank outlet regulating valve (24) for controlling the flow rate of the mixed liquid of the foam solution and the gelling agent is provided in a communication flow path between the main tank (16) and the foaming chamber (26 a), and the gel foam ejecting step S2 further comprises: closing the main tank outlet regulating valve (24) and discharging the residual liquid accumulation in the gel foam injection device (27) when the liquid storage amount or pressure in the main tank (16) is lower than a preset value;

And/or a coagulation liquid tank liquid outlet regulating valve (25) for controlling the flow rate of the coagulation liquid is arranged on a communication flow path between the coagulation liquid tank (17) and the gel foam spraying device (27), and the gel foam spraying step S2 further comprises: when the liquid storage amount or pressure in the coagulation liquid tank (17) is lower than a preset value, the coagulation liquid tank liquid outlet regulating valve (25) is closed, and the residual liquid accumulation in the gel foam injection device (27) is discharged.

6. The gel foam generating method according to claim 1, wherein the foaming device (26) has a mixed liquid inlet channel (26 b), a foam outlet channel (26 d) and a plurality of compressed gas jet channels (26 c) arranged around the mixed liquid inlet channel (26 b) which are respectively communicated to the foaming cavity (26 a), and a liquid dispersing disc (263) is arranged in the foaming cavity (26 a);

The foaming step S1 further includes: the mixed liquid of the foam solution and the gelling agent is guided to be sprayed to the dispersion plate (263) by utilizing the mixed liquid inlet channel (26 b) to form a dispersion liquid flow, and a plurality of air flows introduced by the compressed air jet channel (26 c) are injected into the foaming cavity (26 a) to disturb the dispersion liquid flow and generate the foam, and the foam is output to the gel foam spraying device (27) through the dispersion plate (263) and the foam output channel (26 d).

7. The gel foam generating method according to claim 6, wherein an end face of the dispersion plate (263) facing the mixed liquid inlet channel (26 b) is formed with a dispersion guiding cone surface for guiding the mixed liquid of the foam solution and the gelling agent to disperse.

8. The gel foam generating method according to claim 6, wherein the foaming device (26) includes a mixed liquid nozzle (264), the mixed liquid inlet passage (26 b) is formed at least partially in the mixed liquid nozzle (264) and has a tapered through-flow sectional area at an end toward the foaming chamber (26 a), and an outer peripheral wall surface of the mixed liquid nozzle (264) toward the end of the foaming chamber (26 a) is formed into a tapered jet guiding cone surface.

9. The gel foam generating method according to claim 8, wherein the foaming device (26) includes a first housing part (261) and a second housing part (262) which are sealingly connected to each other and define a housing cavity, the mixed liquid nozzle (264) is mounted in the housing cavity and has an annular boss part (2641) sealingly engaged with an inner wall surface of the housing cavity, the annular boss part (2641) dividing the housing cavity into an annular air cavity (26 e) and the foaming cavity (26 a), the compressed gas jet passage (26 c) is formed on the annular boss part (2641), and a compressed gas inlet port (26 f) communicating to the annular air cavity (26 e) is formed on the first housing part (261).

10. The gel foam generating method according to claim 9, characterized in that a plurality of struts (265) are connected to the liquid dispersion disk (263), both ends of the struts (265) respectively abut against the annular boss portion (2641) and an end wall of the housing chamber located in the second housing portion (262), and the mixed liquid nozzle (264) is mounted so as to abut against an end wall of the housing chamber located in the first housing portion (261).

11. The gel foam generating method according to claim 1, wherein the gel foam ejecting means (27) comprises:

a feeding cylinder (271), wherein a mixed foam inlet (27 a) is arranged on the cylinder wall of the feeding cylinder (271);

A feed core (272), wherein the feed core (272) is arranged in a cylinder cavity of the feed cylinder (271) in a penetrating way, and is provided with a liquid inlet channel (27 b), and a coagulation accelerator inlet (27 c) and a coagulation accelerator outlet (27 d) which are respectively communicated with the liquid inlet channel (27 b);

Wherein the cylinder chamber comprises a feeding chamber (27 e) and a preliminary mixing chamber (27 h) which are communicated in the axial direction, the feeding chamber (27 e) is an annular chamber formed between the outer peripheral wall of the feeding core (272) and the inner peripheral wall of the feeding cylinder (271), the mixed foam inlet (27 a) is communicated to the feeding chamber (27 e), and the coagulation accelerator outlet (27 d) is communicated to the preliminary mixing chamber (27 h).

12. A gel foam generating method according to claim 11, characterized in that the central axis of the mixing foam inlet (27 a) is radially offset with respect to the central axis of the feed chamber (27 e) to be in a out-of-plane arrangement.

13. The gel foam generating method according to claim 11, characterized in that the gel foam injecting device (27) further comprises a mixing tube (274) arranged downstream of the feeding cylinder (271), a lumen of the mixing tube (274) comprises a stirring and mixing chamber (27 f) capable of communicating with the preliminary mixing chamber (27 h), and a stirring and mixing assembly (275) is provided in the stirring and mixing chamber (27 f).

14. The gel foam generating method according to claim 13, wherein the lumen of the mixing tube (274) further comprises a rectifying chamber (27 g) downstream of the stirring mixing chamber (27 f), a rectifying assembly (276) being provided in the rectifying chamber (27 g), the rectifying assembly (276) being formed with a plurality of rectifying flow passages arranged in parallel in the axial direction.

15. The gel foam generating method according to claim 13, characterized in that the gel foam injection device (27) further comprises an on-off valve (273) connected between the mixing tube (274) and the feed cylinder (271) and/or a gel foam nozzle (277) connected to an end of the mixing tube (274) remote from the feed cylinder (271).

16. The gel foam generating method according to claim 11, wherein the coagulation accelerator outlet (27 d) is provided in plurality and arranged on the peripheral wall of the feed core (272) at equal intervals along the circumferential direction of the feed core (272).

17. The gel foam generating method according to claim 11, wherein the coagulation accelerator outlet (27 d) is provided on an axially front end face of the feed core (272), the spraying device further comprising:

A slotted plug (281) arranged in the preliminary mixing chamber (27 h) and the axial rear end of which plugs the coagulation accelerator outlet (27 d);

The supporting component is arranged on the cylinder wall of the feeding cylinder (271) in an adjustable mode in the axial position and is positioned in front of the slotted plug (281) in the axial direction; and

An elastic piece (282) abutted between the slotted plug (281) and the support assembly;

Wherein the support assembly varies the initial amount of compression of the elastic member (282) by being connected at different axial positions of the feed cylinder (271).

18. The gel foam generating method according to claim 1, characterized in that the mixed solution of the foam solution and the gelling agent is stored in a main liquid tank (16), and the coagulation accelerator liquid is stored in a coagulation accelerator liquid tank (17);

The gel foam generating method further comprises a pressurized pre-mixing step S0 performed before the foaming step S1, the pressurized pre-mixing step S0 comprising a pressurized sub-step:

Introducing a second compressed gas below the liquid level in the main liquid tank (16) until the air pressure in the main liquid tank (16) reaches a preset pressure, and in the foaming step S1 and the gel foam spraying step S2, conveying the mixed liquid of the foam solution and the gelling agent in the main liquid tank (16) to the foaming cavity (26 a) under the action of the air pressure;

and/or introducing a third compressed gas into the coagulation accelerator tank (17) until the air pressure in the coagulation accelerator tank (17) reaches a preset pressure, and in the gel foam spraying step S2, the coagulation accelerator liquid in the coagulation accelerator tank (17) can be conveyed to the gel foam spraying device (27) under the action of the air pressure.

19.A gel foam generating method according to claim 18, characterized in that the first, second and third compressed gases are from the same compressed gas source (1).

20. The gel foam generating method according to claim 18, wherein the pressurized premixing step S0 further comprises a liquid adding sub-step performed before the pressurizing sub-step:

Injecting water into the main liquid tank (16), injecting foam stock solution and a gelling agent into the main liquid tank (16), and injecting water into the main liquid tank (16) again, wherein a flow path of the injected water into the main liquid tank (16) at least partially overlaps with a flow path of the injected foam stock solution and the gelling agent;

And/or injecting the coagulation promoting liquid into the coagulation promoting liquid tank (17) and monitoring the liquid amount in the coagulation promoting liquid tank (17) in real time, and reducing the injection speed during the injection process.

21. A gel foam generating system, characterized in that it employs the gel foam generating method according to any one of claims 1 to 20.

22. Fire rescue apparatus, characterized in that it comprises a gel foam generating system according to claim 21.

23. A fire extinguishing method characterized in that the fire extinguishing method adopts the gel foam generating method according to any one of claims 1 to 20 to generate gel foam and sprays the gel foam to the surface of the combustion product.