CN112402844A - Liquid nitrogen foam fire-fighting equipment and foam fire-fighting truck - Google Patents
Liquid nitrogen foam fire-fighting equipment and foam fire-fighting truck Download PDFInfo
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- CN112402844A CN112402844A CN201910784763.2A CN201910784763A CN112402844A CN 112402844 A CN112402844 A CN 112402844A CN 201910784763 A CN201910784763 A CN 201910784763A CN 112402844 A CN112402844 A CN 112402844A
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- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C5/00—Making of fire-extinguishing materials immediately before use
- A62C5/02—Making of fire-extinguishing materials immediately before use of foam
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Abstract
The invention discloses liquid nitrogen foam fire fighting equipment and a foam fire fighting truck, wherein the liquid nitrogen foam fire fighting equipment comprises a foam generating device and a liquid nitrogen supply device (100), wherein the foam generating device is used for mixing liquid nitrogen or nitrogen and foam mixed liquid to generate foam, the liquid nitrogen supply device (100) comprises a liquid nitrogen tank (10) with an output port (101) for outputting the liquid nitrogen and a pressure stabilizing device which is used for keeping the liquid nitrogen within a preset pressure range when the liquid nitrogen is output from the liquid nitrogen tank (10); an output port (101) of the liquid nitrogen tank (10) is connected with the foam generating device to supply liquid nitrogen to the foam generating device. According to the technical scheme provided by the invention, when liquid nitrogen is supplied to the foam generating device so that the liquid nitrogen or the mixed liquid of the nitrogen and the foam is mixed to generate the fire extinguishing foam, the pressure of the liquid nitrogen during injection into the foam generating device can be ensured, the liquid nitrogen keeps proper input flow, and the quality of the generated foam is ensured.
Description
Technical Field
The invention relates to the technical field of fire fighting, in particular to liquid nitrogen foam fire fighting equipment and a foam fire fighting truck.
Background
In the prior art, liquid nitrogen is provided for the foam generating device through a liquid nitrogen tank, so that the liquid nitrogen or the nitrogen generated by the liquid nitrogen and the foam mixed liquid are mixed and foamed to generate foam, and then the foamed positive-pressure foam is sent to the elevating jet fire truck or the fire monitor through the fire fighting belt to jet the foam.
The existing problems are that the liquid nitrogen of a liquid nitrogen tank can not be stabilized and can not be quantitatively output.
When the device works normally, the pressure of liquid nitrogen is required to be higher than that of the foam mixed liquid, and the liquid nitrogen can be injected into the gas-liquid mixer to participate in foaming. The pressure of the liquid nitrogen is provided by the pressure within the liquid nitrogen tank. Under the prior art condition, the unable assurance that lasts that realizes of liquid nitrogen container pressure, along with the process of spraying, the pressure of liquid nitrogen container is the process that descends to lead to the pressure differential between liquid nitrogen container and the foam gas mixture to reduce gradually, the liquid nitrogen flow can reduce gradually, leads to the foam quality that takes place to reduce gradually, needs the artifical pressure of paying attention to the liquid nitrogen container in real time and adjusts the liquid nitrogen flow with the manual regulation liquid nitrogen valve. However, the output pressure of the liquid nitrogen cannot be ensured to be in a proper range by adjusting the valve, so that the generation quality of the foam is influenced.
Disclosure of Invention
The invention aims to solve the problem that the quality of foam generation cannot be stably influenced by the liquid nitrogen output pressure of a liquid nitrogen tank in the prior art.
In order to achieve the above object, the present invention provides, in one aspect, a liquid nitrogen foam fire fighting apparatus comprising a foam generating device for mixing liquid nitrogen or a mixture of nitrogen and foam to generate foam, and a liquid nitrogen supply device, wherein the liquid nitrogen supply device comprises a liquid nitrogen tank having an output port for outputting liquid nitrogen, and a pressure stabilizing device for maintaining the liquid nitrogen within a preset pressure range when the liquid nitrogen is output from the liquid nitrogen tank;
the output port of the liquid nitrogen tank is connected with the foam generating device to supply liquid nitrogen to the foam generating device.
Preferably, the liquid nitrogen tank is provided with a liquid nitrogen outlet and a gas inlet, and a gasifier for gasifying the liquid nitrogen in the pipeline is formed on the pipeline between the liquid nitrogen outlet and the gas inlet;
the pressure stabilizer comprises the gasifier.
Preferably, the pressure stabilizer further comprises a heating device for heating the gasifier;
the heating device comprises a coating part which is coated outside the gasifier and is provided with an electric heating element;
or, the heating device is a water bath component for containing water for heating the gasifier;
or the heating device is a fan used for blowing hot air to the gasifier;
alternatively, the heating device is a water jacket with a fluid capable of flowing, and the gasifier is located within the water jacket.
Preferably, the pressure stabilizer comprises a nitrogen cylinder connected with the liquid nitrogen tank through a pipeline and a pressure reducing valve arranged on the pipeline between the liquid nitrogen tank and the nitrogen cylinder.
Preferably, the pressure stabilizer comprises a heater capable of adjusting heat supply and arranged in the liquid nitrogen tank.
Preferably, the pressure stabilizer is a liquid nitrogen pump connected with the output port.
Preferably, the liquid nitrogen supply device further comprises a flow control device for controlling the flow of liquid nitrogen to the output port.
Preferably, the flow control device comprises an orifice plate arranged on a pipeline connected with the output port, the orifice plate is provided with a plurality of openings with different sizes, and the output port can be switched to be communicated with different openings;
or the flow control device comprises a flow regulating valve arranged on a pipeline connected with the output port;
or the flow control device is a liquid nitrogen pump connected with the output port.
Preferably, the liquid nitrogen tank is provided with a pressure regulating valve which can release pressure after the pressure in the liquid nitrogen tank exceeds a preset range.
Preferably, the foam generating device comprises a foam generator having a liquid nitrogen inlet for inputting liquid nitrogen, a foam mixture inlet for inputting foam mixture, and a foam outlet for outputting foam, and the output port of the liquid nitrogen supply device is connected to the liquid nitrogen inlet.
Preferably, the liquid nitrogen foam fire-fighting equipment further comprises a foam mixing device, the foam mixing device is provided with a foam stock solution inlet for inputting foam stock solution, a water inlet for inputting water and a foam mixed solution outlet for outputting foam mixed solution, and the foam mixed solution outlet is connected with the foam mixed solution inlet of the foam generator.
Preferably, the foam fire fighting equipment is further provided with a foam stock solution storage tank for storing foam stock solution, and the foam stock solution storage tank is connected with the foam stock solution inlet of the foam mixing device.
Preferably, the liquid nitrogen foam fire fighting equipment is further provided with a foam mixed liquid storage tank for storing foam mixed liquid, and the foam mixed liquid storage tank is connected with the foam mixed liquid inlet of the foam generator.
Preferably, the foam generating device comprises a foam mixed liquid storage device for containing foam mixed liquid, and the output port of the liquid nitrogen supply device is connected with the foam mixed liquid storage device to input liquid nitrogen to the foam mixed liquid storage device;
the foam generating device further comprises a gas-liquid mixer with a foam mixed liquid inlet, a nitrogen inlet and a foam outlet, the foam mixed liquid inlet is arranged to be capable of being communicated with a liquid phase in the foam mixed liquid storage device to input foam mixed liquid in the foam mixed liquid storage device into the gas-liquid mixer, the nitrogen inlet is arranged to be capable of being communicated with a gas phase in the foam mixed liquid storage device to input nitrogen generated by gasifying liquid nitrogen in the foam mixed liquid storage device into the gas-liquid mixer, and the foam mixed liquid and the nitrogen generated by mixing in the gas-liquid mixer are sprayed out from the foam outlet.
Preferably, the gas-liquid mixer is located outside the foam mixed liquid storage device, the foam mixed liquid inlet is communicated to a lower position in the foam mixed liquid storage device through a pipeline to communicate with a liquid phase in the foam mixed liquid storage device, and the liquefied gas inlet is communicated to an upper position in the foam mixed liquid storage device through a pipeline to communicate with a gas phase in the foam mixed liquid storage device.
Preferably, the gas-liquid mixer is located in the foam mixed liquid storage device, the foam mixed liquid inlet is disposed at a lower position in the foam mixed liquid storage device to communicate with a liquid phase in the foam mixed liquid storage device, and the nitrogen inlet is disposed at an upper position in the foam mixed liquid storage device to communicate with a gas phase in the foam mixed liquid storage device.
The invention also provides a foam fire fighting truck, wherein the foam fire fighting truck is provided with the liquid nitrogen foam fire fighting equipment.
According to the liquid nitrogen foam fire fighting equipment and the foam fire fighting truck, when liquid nitrogen is supplied to the foam generating device so that the liquid nitrogen or the mixed liquid of the nitrogen and the foam is mixed to generate fire extinguishing foam, the pressure of the liquid nitrogen during injection into the foam generating device can be ensured, the liquid nitrogen keeps proper input flow, and the quality of the generated foam is ensured.
Drawings
FIG. 1 is a schematic view showing the construction of a liquid nitrogen supply apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic configuration diagram of a liquid nitrogen supply apparatus according to another embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a liquid nitrogen foam fire fighting device according to an embodiment of the present invention;
FIG. 4 is a schematic structural view of a foam generator according to an embodiment of the present invention;
FIG. 5 is a schematic structural view of a liquid nitrogen foam fire fighting device according to another embodiment of the present invention;
FIG. 6 is a schematic structural view of a liquid nitrogen foam fire fighting device according to still another embodiment of the present invention;
FIG. 7 is a schematic structural view of a liquid nitrogen foam fire fighting device according to still another embodiment of the present invention;
FIG. 8 is a schematic structural view of a liquid nitrogen foam fire fighting device according to still another embodiment of the present invention;
fig. 9 is a schematic structural view of a liquid nitrogen foam fire fighting device according to still another embodiment of the present invention.
Description of the reference numerals
100-liquid nitrogen supply device; 10-liquid nitrogen tank; 101-an output port; 102-liquid nitrogen outlet; 103-nitrogen inlet; 20-a gasifier; a 30-nitrogen gas cylinder; 301-pressure relief valves; 200-a foam generator; 201-foam mixed liquor inlet; 202-liquid nitrogen inlet; 203-foam outlet; 300-a foam mixing device; 301-foam concentrate inlet; 302-water inlet; 303-foam mixed liquor outlet; 400-a foam stock solution storage tank; 500-foam mixed liquor storage tank; 600-foam mixed liquor storage device; 700-gas-liquid mixer; 701-foam mixed liquid inlet; 702-nitrogen inlet; 703-foam outlet.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
The invention provides liquid nitrogen foam fire-fighting equipment, which comprises a foam generating device and a liquid nitrogen supply device 100, wherein the foam generating device is used for mixing liquid nitrogen or nitrogen and foam mixed liquid to generate foam, the liquid nitrogen supply device 100 comprises a liquid nitrogen tank 10 with an output port 101 for outputting the liquid nitrogen and a pressure stabilizing device used for keeping the liquid nitrogen within a preset pressure range when the liquid nitrogen is output from the liquid nitrogen tank 10, as shown in figure 1;
the output port 101 of the liquid nitrogen tank 10 is connected to the bubble generating device to supply liquid nitrogen thereto.
When liquid nitrogen is supplied to the foam generating device through the liquid nitrogen supply device 100 so that the liquid nitrogen or nitrogen generated by the liquid nitrogen is mixed with the foam mixture to generate fire extinguishing foam, for example, when the output port 101 of the liquid nitrogen tank 10 is connected with the liquid nitrogen inlet 202 of the foam generator 200 shown in fig. 3, the pressure when the liquid nitrogen is injected into the foam generator 200 can be ensured, so that the flow rate of the liquid nitrogen and the input flow rate of the foam mixture are kept in a proper ratio, and the quality of the generated foam is ensured.
Therefore, according to the technical scheme provided by the invention, the pressure stabilizing device is arranged on the liquid nitrogen supply device 100, so that the problem that the quality of generated foam is reduced because the output pressure of liquid nitrogen cannot be ensured due to the fact that the flow of the liquid nitrogen is gradually reduced due to the pressure reduction in the liquid nitrogen tank along with the output of the liquid nitrogen in the prior art can be solved. In addition, through setting up pressure stabilizing device, even the liquid nitrogen is under the low liquid level condition, the output pressure of liquid nitrogen also can be guaranteed for the liquid nitrogen container is put into use rapidly.
The pressure regulating device of the liquid nitrogen supply device 100 may take various suitable forms. The following is a description of several embodiments.
The first embodiment is as follows:
as shown in fig. 1, the outlet 101 of the liquid nitrogen tank 10 is preferably provided at the bottom of the liquid nitrogen pipe 10, but it is also possible to provide an outlet line extending from above to the bottom of the liquid nitrogen tank 10. The liquid nitrogen tank 10 is provided with a liquid nitrogen outlet 102 and a gas inlet 103, a gasifier 20 for gasifying the liquid nitrogen in the pipeline is formed on the pipeline between the liquid nitrogen outlet 102 and the gas inlet 103, and the pressure stabilizer comprises the gasifier 20. The vaporizer 20 may be in the form of a bent pipeline, that is, the liquid nitrogen tank 10 outputs liquid nitrogen through the pipeline to the outside environment temperature so that the liquid nitrogen in the pipeline is vaporized and then input into the liquid nitrogen tank 10, that is, the self-pressurization mode is adopted to increase the pressure in the tank.
Control valves are provided between an inlet of the vaporizer 20 and the liquid nitrogen outlet 102 of the liquid nitrogen tank 10 and between an outlet of the vaporizer 20 and the gas inlet 103 of the liquid nitrogen tank 10. When the liquid nitrogen container 10 is in the working state (i.e. during the process of outputting the liquid nitrogen in the liquid nitrogen container 10 to the outside), the self-pressurization state of the liquid nitrogen container 10 can be changed by controlling the valve. Specifically, the operating pressure of the liquid nitrogen tank 10 is set to 1.4MPa, and when the pressure in the liquid nitrogen tank 10 is lower than a set pressure (for example, 1.2MPa), the control valve is opened to allow the gas to enter the vaporizer 20 for vaporization, and the liquid nitrogen tank 10 is in a self-pressurization state, and when the pressure in the liquid nitrogen tank 10 reaches a certain value (1.4MPa), the control valve is closed to prevent the gas from entering the vaporizer 20, and the self-pressurization state of the liquid nitrogen tank 10 is closed. Therefore, in the output process of the liquid nitrogen, the pressure in the liquid nitrogen tank 10 can be stabilized through the switch control valve, and the output pressure of the liquid nitrogen is ensured.
Example two:
the pressure stabilizer comprises the vaporizer 20 in the first embodiment, and a heating device for heating the vaporizer 20, wherein the heating device can accelerate the vaporization of the liquid nitrogen so as to supplement the pressure in the tank in time. Of course, in the case where the vaporizer 20 can sufficiently replenish the pressure in the liquid nitrogen tank by the influence of the external ambient temperature, the heating device may not be provided. The heating device can heat the gasifier 20 under the condition that the liquid level in the liquid nitrogen tank 10 is low and more nitrogen gas needs to be supplemented.
In this embodiment, the heating device includes a cladding member having an electric heating element and cladding the outside of the vaporizer 20.
Of course, the heating device for heating the vaporizer may also take other various forms, such as the following examples three to five.
Example three:
unlike the second embodiment, the heating device for heating the vaporizer 20 is a water bath member for containing water for heating the vaporizer 20, the vaporizer 20 is located in the water, and the vaporizer 20 is heated by the water in the water bath member.
Example four:
unlike the second embodiment, the heating device is a fan for blowing hot air to the vaporizer 20.
Example five:
different from the second embodiment, the heating device is a water jacket with a fluid capable of flowing, the vaporizer 20 is located in the water jacket, water in the water jacket flows out after heating the vaporizer 20, then new water flows into the water jacket, and the new water flows in to heat the vaporizer 20, and the cycle is repeated, so that the efficiency of the vaporizer can be improved.
Example six:
as shown in fig. 2, the pressure stabilizing means for stabilizing the pressure of the liquid nitrogen tank 10 may include a nitrogen gas cylinder 30 connected to the liquid nitrogen tank 10 through a pipe and a pressure reducing valve 301 provided on the pipe between the liquid nitrogen tank 10 and the nitrogen gas cylinder 30. The nitrogen gas in the nitrogen gas cylinder 30 is injected into the liquid nitrogen tank 10 and the pressure in the liquid nitrogen tank 10 is maintained by the pressure reducing valve 301.
Example seven:
the pressure stabilizer comprises a heater which is arranged in the liquid nitrogen tank 10 and can adjust heat supply, a pressure detector which can detect the pressure in the liquid nitrogen tank 10 can be arranged, the heater can adjust the heating amount according to the pressure value detected by the pressure detector, and when the pressure reaches a certain value, the heater reduces or stops heating.
Example eight:
the pressure stabilizer is a liquid nitrogen pump connected with the output port 101. A liquid nitrogen pump for outputting liquid nitrogen may be provided at the output port 101 of the liquid nitrogen tank 10, and the liquid nitrogen output pressure is maintained by the liquid nitrogen pump.
In addition, in the technical scheme provided by the invention, the liquid nitrogen supply device 100 further comprises a flow control device for controlling the flow of the liquid nitrogen at the output port 101, so that the output flow of the liquid nitrogen can be controlled.
Preferably, the flow control device comprises an orifice plate arranged on a pipeline connected with the output port 101 of the liquid nitrogen tank 10, the orifice plate is provided with a plurality of openings with different sizes, and the output port 101 can be switched to be communicated with different openings. Different trompils represent different flow, and delivery outlet 101 can switch to the trompil intercommunication with certain size according to the flow demand.
Of course, the flow control device may also adopt other manners, for example, the flow control device includes a flow regulating valve disposed on a pipeline connected to the output port 101; or, the flow control device is a liquid nitrogen pump connected to the output port 101, and the flow is controlled by the liquid nitrogen pump.
When the liquid nitrogen supply device 100 is in a non-working state, all the valves are closed, and the whole device is in a power-off state. Since the liquid nitrogen is partially vaporized in the liquid nitrogen tank 10 to increase the internal pressure, a pressure regulating valve for regulating the pressure in the liquid nitrogen tank 10 not to exceed a set value is further provided to the liquid nitrogen tank 10. For example, the pressure of the pressure regulating valve is set to 1.4MPa, that is, the pressure in the liquid nitrogen tank 10 is set to not more than 1.4MPa, and the pressure regulating valve is automatically released when the pressure in the tank exceeds 1.4 MPa. Therefore, when the liquid nitrogen supply device is in a non-working daily storage state, pressure does not need to be discharged manually or through a safety valve, and the pressure safety of the liquid nitrogen tank can be ensured.
When the liquid nitrogen supply device 100 is in the working state, the pressure regulating valve on the liquid nitrogen tank 10 is closed.
The foam generating device in the liquid ammonia foam fire fighting equipment provided by the invention can also adopt various types of devices capable of generating foam.
In the embodiment shown in fig. 3, the foam generating apparatus includes a foam generator 200 for mixing liquid nitrogen with foam mixture to generate foam, the foam generator 200 has a liquid nitrogen inlet 202 for inputting liquid nitrogen, a foam mixture inlet 201 for inputting foam mixture, and a foam outlet 203 for outputting foam, and the output port 101 of the liquid nitrogen supply apparatus 100 is connected to the liquid nitrogen inlet 202. In the chamber of the foam generator 200, the liquid nitrogen injected from the liquid nitrogen inlet 202 is mixed with the foam mixed liquid injected from the foam mixed liquid inlet 201, and since the foam mixed liquid is at normal temperature, the liquid nitrogen is rapidly gasified when mixed with the foam mixed liquid and generates foam with the foam mixed liquid, and then the foam is ejected from the foam outlet 203 under the pressure in the chamber, wherein the foam outlet 203 can be connected with a foam ejection pipeline.
The liquid nitrogen foam fire fighting equipment provided by the invention adopts the liquid nitrogen supply device 100, and can ensure the pressure when the liquid nitrogen is injected into the foam generator 200, thereby ensuring the quality of the foam generated in the foam generator 200.
Preferably, the liquid nitrogen foam fire fighting equipment adopts a liquid nitrogen supply device 100 as shown in fig. 1, the liquid nitrogen supply device 100 is provided with a gasifier 20, control valves are arranged between an inlet of the gasifier 20 and a liquid nitrogen outlet 102 of a liquid nitrogen tank 10 and between an outlet of the gasifier 20 and a gas inlet 103 of the liquid nitrogen tank 10, the working pressure when the liquid nitrogen is input into the foam generator 200 from the liquid nitrogen tank 10 can be set to be 1.4MPa, when the liquid nitrogen in the liquid nitrogen tank 10 is output into the foam generator 200 and the pressure is reduced to 1.2MPa, the control valves are opened, the liquid nitrogen in the liquid nitrogen tank 10 flows out from the liquid nitrogen outlet 102 and is gasified in the gasifier 20, then the nitrogen enters into the liquid nitrogen tank 10 from the gas inlet 103, the liquid nitrogen tank 10 realizes self-pressurization, and when the pressure in the liquid nitrogen tank reaches 1.4MPa again, the control valves are closed, and the gasifier 20 stops working. Therefore, in the output process of the liquid nitrogen, the pressure in the liquid nitrogen tank 10 can be stabilized through the switch control valve, and the output pressure of the liquid nitrogen is ensured.
Of course, the working pressure of the liquid nitrogen tank 10 may also be adjusted in real time according to the pressure of the foam mixed liquid entering the foam generator 200, if the working pressure of the liquid nitrogen tank 10 is required to be higher than the pressure of the foam mixed liquid by 0.2MPa, when the pressure difference is lower than 0.1MPa, the self-pressurization is started, that is, the control valve is opened, so that the liquid nitrogen in the liquid nitrogen tank 10 enters the vaporizer 20 to be vaporized and then enters the liquid nitrogen tank. When the pressure difference is higher than 0.2MPa, the self-pressurization is closed, namely the control valve is closed to prevent liquid nitrogen from entering the gasifier 20.
Preferably, the ratio of the flow rate of the foam mixed liquid injected into the foam generator 200 and the flow rate of the liquid nitrogen injected into the foam generator 200 is: 100: 0 to 3.
In order to ensure the flow ratio of the foam mixed liquid and the liquid nitrogen, a flow regulating valve is further arranged between the output port 101 of the liquid nitrogen tank 10 and the foam generator 200, and the flow regulating valve can be regulated according to the flow of the foam mixed liquid injected into the foam generator 200, so that the flow of the liquid nitrogen injected into the foam generator 200 and the flow of the foam mixed liquid are kept within a certain ratio range.
When the foam mixed liquid and the liquid nitrogen are input into the foam generator 200 to generate the working state of the foam, the foam mixed liquid is required to be firstly introduced into the foam generator 200, and then the liquid nitrogen is introduced; when the work is stopped, the liquid nitrogen is closed firstly, and then the foam mixed liquid is closed, so that ice blockage can be avoided.
The liquid nitrogen foam fire fighting equipment provided by the invention can preferably adopt a foam generator 200 as shown in fig. 4, wherein the foam generator 200 is of a cylindrical structure, one end of the cylindrical structure is provided with a foam mixed liquid inlet 201, the other end of the cylindrical structure is provided with a foam outlet 203, a liquid nitrogen inlet 202 is arranged on the side wall of the cylindrical structure, and a turbulence generator 204 and a porous structure 205 with a plurality of pores are further arranged inside a cavity of the foam generator, so that liquid nitrogen or gasified nitrogen and the foam mixed liquid can be fully mixed. Of course, other structural forms of foam generators may be used.
The liquid nitrogen foam fire fighting equipment including the foam generator 200 may adopt various configurations.
The first configuration scheme is as follows:
as shown in fig. 3, the foam mixed liquid inlet 201 of the foam generator 200 is configured to be connected to any external device capable of supplying foam mixed liquid.
The second configuration scheme is as follows:
as shown in fig. 5, the liquid nitrogen foam fire fighting equipment is further provided with a foam mixing device 300 for generating foam mixture, the foam mixing device 300 is provided with a foam raw liquid inlet 301 for inputting foam raw liquid, a water inlet 302 for inputting water and a foam mixture outlet 303 for outputting foam mixture, and the foam mixture outlet 303 is connected with the foam mixture inlet 201 of the foam generator 200.
The water inlet 302 therein is typically connected to an external water supply, such as tap water. The foam concentrate inlet 301 may be connected to any external device capable of providing foam concentrate.
The third configuration scheme is as follows:
as shown in fig. 6, in addition to the apparatus shown in fig. 5, the foam fire fighting equipment is further provided with a foam raw liquid storage tank 400 for storing foam raw liquid, and the foam raw liquid inlet 301 of the foam mixing apparatus 300 is connected to the foam raw liquid storage tank 400 to supply the foam raw liquid through the foam raw liquid storage tank 400.
The foam raw liquid input from the foam raw liquid inlet 301 and the water input from the water inlet 302 are mixed in the foam mixing device 300 to generate foam mixed liquid, and then the foam mixed liquid is output from the foam mixed liquid outlet 303 to the foam mixed liquid inlet 201 of the foam generator 200; the foam mixture introduced from foam mixture inlet 201 is mixed with liquid nitrogen introduced from liquid nitrogen inlet 202 in foam generator 200 to generate foam.
The fourth configuration scheme is as follows:
as shown in fig. 7, a liquid nitrogen foam fire fighting device is provided with a foam mixed liquid storage tank 500 for storing foam mixed liquid, the foam mixed liquid storage tank 500 is connected with a foam mixed liquid inlet 201 of the foam generator 200, in this embodiment, the foam mixed liquid is directly provided through the foam mixed liquid storage tank 500, and this configuration is suitable for the working condition with a smaller fire extinguishing range.
Further, in another embodiment, as shown in fig. 8 and 9, the foam generating apparatus further includes a foam mixed liquid storage device 600 for holding the foam mixed liquid, and the output port 101 of the liquid nitrogen supply device 100 is connected to the foam mixed liquid storage device 600 to input liquid nitrogen to the foam mixed liquid storage device 600.
As shown in fig. 8 and 9, the foam generating apparatus according to this embodiment further includes a gas-liquid mixer 700 having a foam mixture inlet 701, a nitrogen gas inlet 702, and a foam outlet 703, the foam mixture inlet 701 is provided to be capable of communicating with a liquid phase in the foam mixture storage apparatus 600 to input the foam mixture in the foam mixture storage apparatus 600 to the gas-liquid mixer 700, the nitrogen gas inlet 702 is provided to be capable of communicating with a gas phase in the foam mixture storage apparatus 600 to input nitrogen gas generated by vaporization of liquid nitrogen in the foam mixture storage apparatus 600 to the gas-liquid mixer 700, and foam generated by mixing the foam mixture and the nitrogen gas in the gas-liquid mixer 700 is ejected from the foam outlet 703.
According to the technical scheme, after liquid nitrogen is input into the foam mixed liquid storage device 600 by the liquid nitrogen supply device 100, the liquid nitrogen is gasified in the foam mixed liquid storage device 600 to generate gas, so that a certain pressure exists in the foam mixed liquid storage device 600, then the gas generated by the gasification of the liquid nitrogen automatically enters the gas-liquid mixer 700 through the nitrogen inlet 702 under the certain pressure, and the foam mixed liquid automatically enters the gas-liquid mixer 700 through the foam mixed liquid inlet 701 under the certain pressure, so that the nitrogen and the foam mixed liquid are mixed in the gas-liquid mixer 700 to generate foam.
The liquid nitrogen foam fire fighting equipment can have the following two configuration schemes.
The fifth configuration scheme is as follows:
as shown in fig. 8, the gas-liquid mixer 700 is located outside the foam mixture liquid storage device 600, and the foam mixture liquid inlet 701 is connected to a lower position in the foam mixture liquid storage device 600 through a pipeline to communicate with a liquid phase in the foam mixture liquid storage device 600, and the liquefied gas inlet 702 is connected to an upper position in the foam mixture liquid storage device 600 through a pipeline to communicate with a gas phase in the foam mixture liquid storage device 600.
The sixth configuration scheme is as follows:
as shown in fig. 9, the gas-liquid mixer 700 may be located in the foam mixture liquid storage device 600, and the foam mixture liquid inlet 701 may be provided at a lower position in the foam mixture liquid storage device 600 to communicate with a liquid phase in the foam mixture liquid storage device 600, and the nitrogen gas inlet 702 may be provided at an upper position in the foam mixture liquid storage device 600 to communicate with a gas phase in the foam mixture liquid storage device 600.
The invention also provides a foam fire fighting truck, wherein the foam fire fighting truck is provided with the liquid nitrogen foam fire fighting equipment.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, numerous simple modifications can be made to the technical solution of the invention, including combinations of the individual specific technical features in any suitable way. The invention is not described in detail in order to avoid unnecessary repetition. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.
Claims (17)
1. Liquid nitrogen foam fire fighting equipment, characterized in that the liquid nitrogen foam fire fighting equipment comprises a foam generating device for mixing liquid nitrogen or nitrogen gas with foam mixture to generate foam, and a liquid nitrogen supply device (100), wherein the liquid nitrogen supply device (100) comprises a liquid nitrogen tank (10) with an output port (101) for outputting liquid nitrogen, and a pressure stabilizing device for keeping the liquid nitrogen within a preset pressure range when the liquid nitrogen is output from the liquid nitrogen tank (10);
the output port (101) of the liquid nitrogen tank (10) is connected with the foam generating device to supply liquid nitrogen to the foam generating device.
2. The liquid nitrogen foam fire fighting apparatus according to claim 1, wherein the liquid nitrogen tank (10) has a liquid nitrogen outlet (102) and a gas inlet (103), and a vaporizer (20) for vaporizing liquid nitrogen in the pipeline is formed on the pipeline between the liquid nitrogen outlet (102) and the gas inlet (103);
the pressure stabilizer includes the vaporizer (20).
3. The liquid nitrogen foam fire fighting apparatus according to claim 2, wherein the pressure stabilizer further comprises a heating device for heating the vaporizer (20);
the heating device comprises a coating component which is coated outside the gasifier (20) and is provided with an electric heating element;
alternatively, the heating means is a water bath member for containing water for heating the vaporizer (20);
or the heating device is a fan used for blowing hot air to the gasifier (20);
alternatively, the heating device is a water jacket with a fluid capable of flowing, and the gasifier (20) is located within the water jacket.
4. The liquid nitrogen foam fire fighting apparatus according to claim 1, wherein the pressure stabilizer comprises a nitrogen gas cylinder (30) to which the liquid nitrogen tank (10) is connected through a pipeline, and a pressure reducing valve (301) provided on the pipeline between the liquid nitrogen tank (10) and the nitrogen gas cylinder (30).
5. The liquid nitrogen foam fire fighting apparatus according to claim 1, wherein the pressure stabilizer comprises a heater capable of regulating heat supply provided in the liquid nitrogen tank (10).
6. The liquid nitrogen foam fire fighting apparatus according to claim 1, wherein the pressure stabilizing device is a liquid nitrogen pump connected to the output port (101).
7. The liquid nitrogen foam fire fighting apparatus according to claim 1, wherein the liquid nitrogen supply device (100) further comprises a flow control device for controlling the flow of liquid nitrogen to the output port (101).
8. The liquid nitrogen foam fire fighting apparatus according to claim 7, wherein the flow control device comprises an orifice plate provided on a pipeline to which the output port (101) is connected, the orifice plate being provided with a plurality of openings of different sizes, the output port (101) being switchable to communicate with the different openings;
or the flow control device comprises a flow control valve arranged on a pipeline connected with the output port (101);
or the flow control device is a liquid nitrogen pump connected with the output port (101).
9. The liquid nitrogen foam fire fighting equipment according to claim 1, wherein the liquid nitrogen tank (10) is provided with a pressure regulating valve capable of performing pressure relief after the pressure in the liquid nitrogen tank (10) exceeds a preset range.
10. The liquid nitrogen foam fire fighting apparatus according to any one of claims 1 to 9, wherein the foam generating device comprises a foam generator (200), the foam generator (200) having a liquid nitrogen inlet (202) for inputting liquid nitrogen and a foam mixture inlet (201) for inputting foam mixture and a foam outlet (203) for outputting foam, the output port (101) of the liquid nitrogen supply device (100) being connected to the liquid nitrogen inlet (202).
11. The liquid nitrogen foam fire fighting apparatus according to claim 10, further comprising a foam mixing device (300), the foam mixing device (300) being provided with a foam concentrate inlet (301) for inputting foam concentrate, a water inlet (302) for inputting water, and a foam mixture outlet (303) for outputting foam mixture, the foam mixture outlet (303) being connected with the foam mixture inlet (201) of the foam generator (200).
12. The liquid nitrogen foam fire fighting apparatus according to claim 11, characterized in that the foam fire fighting apparatus is further provided with a foam raw liquid storage tank (400) storing foam raw liquid, the foam raw liquid storage tank (400) being connected with the foam raw liquid inlet (301) of the foam mixing device (300).
13. The liquid nitrogen foam fire fighting apparatus according to claim 10, wherein a foam mixture storage tank (500) for storing foam mixture is further provided on the liquid nitrogen foam fire fighting apparatus, and the foam mixture storage tank (500) is connected to the foam mixture inlet (201) of the foam generator (200).
14. The liquid nitrogen foam fire fighting apparatus according to any one of claims 1 to 9, wherein the foam generating device comprises a foam mixture storage device (600) for containing foam mixture, and the output port (101) of the liquid nitrogen supply device (100) is connected to the foam mixture storage device (600) to input liquid nitrogen to the foam mixture storage device (600);
the foam generating device further comprises a gas-liquid mixer (700) which is provided with a foam mixed liquid inlet (701), a nitrogen inlet (702) and a foam outlet (703), wherein the foam mixed liquid inlet (701) is communicated with a liquid phase in the foam mixed liquid storage device (600) to input the foam mixed liquid in the foam mixed liquid storage device (600) into the gas-liquid mixer (700), the nitrogen inlet (702) is communicated with a gas phase in the foam mixed liquid storage device (600) to input nitrogen generated by the gasification of liquid nitrogen in the foam mixed liquid storage device (600) into the gas-liquid mixer (700), and foam generated by the mixing of the foam mixed liquid and the nitrogen in the gas-liquid mixer (700) is sprayed out from the foam outlet (703).
15. The liquid nitrogen foam fire fighting apparatus according to claim 14, wherein the gas-liquid mixer (700) is located outside the foam mixture storage device (600), and the foam mixture inlet (701) is communicated to a lower position inside the foam mixture storage device (600) through a pipeline to communicate with a liquid phase inside the foam mixture storage device (600), and the liquefied gas inlet (702) is communicated to an upper position inside the foam mixture storage device (600) through a pipeline to communicate with a gas phase inside the foam mixture storage device (600).
16. The liquid nitrogen foam fire fighting apparatus according to claim 14, wherein the gas-liquid mixer (700) is located in the foam mixture storage device (600), and the foam mixture inlet (701) is provided at a lower position in the foam mixture storage device (600) to communicate with a liquid phase in the foam mixture storage device (600), and the nitrogen gas inlet (702) is provided at an upper position in the foam mixture storage device (600) to communicate with a gas phase in the foam mixture storage device (600).
17. A foam fire fighting truck, characterized in that the foam fire fighting truck is provided with a liquid nitrogen foam fire fighting equipment according to any one of claims 1-16.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910784763.2A CN112402844A (en) | 2019-08-23 | 2019-08-23 | Liquid nitrogen foam fire-fighting equipment and foam fire-fighting truck |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910784763.2A CN112402844A (en) | 2019-08-23 | 2019-08-23 | Liquid nitrogen foam fire-fighting equipment and foam fire-fighting truck |
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| CN112402844A true CN112402844A (en) | 2021-02-26 |
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| CN201910784763.2A Pending CN112402844A (en) | 2019-08-23 | 2019-08-23 | Liquid nitrogen foam fire-fighting equipment and foam fire-fighting truck |
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Application publication date: 20210226 |