CN110743118B - Foam fire extinguishing system and fire extinguishing method - Google Patents
Foam fire extinguishing system and fire extinguishing method Download PDFInfo
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- CN110743118B CN110743118B CN201910902097.8A CN201910902097A CN110743118B CN 110743118 B CN110743118 B CN 110743118B CN 201910902097 A CN201910902097 A CN 201910902097A CN 110743118 B CN110743118 B CN 110743118B
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
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- A62C5/02—Making of fire-extinguishing materials immediately before use of foam
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Abstract
The invention discloses a foam fire extinguishing system, which relates to the technical field of fire extinguishing and comprises a fire-fighting water source, a fire-fighting water delivery pipe, a foam liquid storage tank, a foam liquid delivery pipe, a nitrogen storage tank, a nitrogen delivery pipe, a mixer, a mixed liquid delivery pipe, a nitrogen generator and an air filter, wherein the fire-fighting water delivery pipe is sequentially provided with a liquid flow meter I, an adjusting valve I and a one-way valve I; a second liquid flow meter, a second regulating valve and a second one-way valve are sequentially arranged on the foam liquid conveying pipe; the nitrogen conveying pipe is sequentially provided with a stop valve, a gas flowmeter, a third regulating valve and a third check valve. The invention also discloses a method for extinguishing fire by adopting the system. The invention has the beneficial effects that the nitrogen, the water and the foam liquid are mixed and foamed, so that the fire extinguishing effect of the foam on fire is improved; meanwhile, the structure of the mixer is improved, the mixing and foaming effects of nitrogen, water and foam concentrate are improved, and the fire extinguishing effect and efficiency are improved.
Description
Technical Field
The invention relates to the technical field of fire extinguishing, in particular to a foam fire extinguishing system and a fire extinguishing method.
Background
At present, when large-scale petroleum and petrochemical fire disasters occur, compressed air foam is generally utilized to extinguish the fire. The principle is that air, water and foam are mixed and foamed under specific and proportional conditions to produce specific foam for fire extinguishing. Compared with the direct water fire extinguishing, the foam can improve the original physical properties of pure water, and has the functions of reducing the surface tension of water, increasing the coverage area of water and the like, so that the fire extinguishing by the foam can quickly and effectively prevent combustion chain reaction, and greatly improve the fire extinguishing efficiency. However, the air in the compressed air foam can introduce fresh oxygen into the combustion, which can adversely affect rapid fire suppression.
In addition, in the compressed air foam fire extinguishing system, the sufficient degree of gas-liquid mixing is related to the foaming times of the foam extinguishing agent, and the foaming times are important indexes of the fire extinguishing efficiency of the system. At present, compressed air and foam mixed liquid are mixed in a mixer, the existing mixer is simple in structure, foam liquid and water are mixed for a long time and are not mixed uniformly enough, and the mixing efficiency of the compressed air and the foam mixed liquid is also low, so that the fire extinguishing efficiency of a compressed air foam fire extinguishing system is influenced.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art: provides a foam fire extinguishing system with good fire extinguishing effect and a fire extinguishing method.
The technical solution of the invention is as follows:
a foam fire extinguishing system comprises a fire water source, a fire water delivery pipe, a foam concentrate storage tank, a foam concentrate delivery pipe, a nitrogen storage tank, a nitrogen delivery pipe, a mixer and a mixed liquid delivery pipe;
the input end of the fire fighting water delivery pipe is communicated with the fire fighting water source, and the output end of the fire fighting water delivery pipe is communicated with the mixer; the fire fighting water delivery pipe is sequentially provided with a first liquid flow meter, a first regulating valve and a first one-way valve;
the input end of the foam concentrate conveying pipe is communicated with the foam concentrate storage tank, and the output end of the foam concentrate conveying pipe is communicated with the mixer; a second liquid flow meter, a second regulating valve and a second one-way valve are sequentially arranged on the foam liquid conveying pipe;
the input end of the nitrogen conveying pipe is communicated with the nitrogen storage tank, and the output end of the nitrogen conveying pipe is communicated with the mixer; the nitrogen conveying pipe is sequentially provided with a stop valve, a gas flowmeter, a third regulating valve and a third check valve;
the output end of the mixer is connected with the mixed liquid conveying pipe;
the system also comprises a nitrogen generator and an air filter, wherein the nitrogen storage tank is sequentially communicated with the nitrogen generator and the air filter through pipelines.
Furthermore, a fire water inlet, a foam liquid inlet, a nitrogen inlet and a foam liquid outlet are formed in the mixer;
the fire-fighting water inlet and the foam liquid inlet are respectively communicated with the output ends of the fire-fighting water conveying pipe and the foam liquid conveying pipe, the fire-fighting water inlet and the foam liquid inlet are positioned at the top end of the mixer, and the fire-fighting water inlet and the foam liquid inlet are arranged at an angle;
the nitrogen inlet is communicated with the output end of the nitrogen conveying pipe, the nitrogen inlet is positioned below the fire water inlet and the foam liquid inlet, and the nitrogen conveying pipe is obliquely and upwardly connected to the mixer;
a baffle and a dispersion net are arranged in the mixer; the baffle is positioned below the fire water inlet and the foam liquid inlet and above the nitrogen inlet; the dispersion net is positioned between the nitrogen inlet and the foam concentrate outlet; the baffle is obliquely fixed on the inner wall of the mixer, and a plurality of through holes are formed in the baffle.
Further, still be equipped with in the blender and be located the ascending deconcentrator of the axial of blender, be equipped with the toper structure on the deconcentrator, the toper top of toper structure is up.
Further, the fire water inlet and the foam liquid inlet are symmetrically arranged at the top end of the mixer by taking the axial direction of the mixer as a symmetry axis; the disperser is provided with a conical top which faces upwards to the top end of the mixer along the vertical direction.
Furthermore, the fire water delivery pipe and the foam liquid delivery pipe are obliquely and downwards connected to the mixer, and an included angle of 30-75 degrees is formed between the fire water delivery pipe and the foam liquid delivery pipe; the disperser is positioned below the intersection point of the extension lines of the fire fighting water delivery pipe and the foam liquid delivery pipe.
Furthermore, two conical tops are arranged on the disperser and face the fire water inlet and the foam liquid inlet respectively.
Furthermore, a water through hole is formed in the disperser.
Furthermore, the included angle between the baffle and the inner wall of the mixer is 15-75 degrees;
further, the nitrogen inlet is perpendicular to the plane of the baffle, and the through hole is axially perpendicular to the plane of the baffle.
A fire extinguishing method adopts the foam fire extinguishing system to extinguish fire.
The invention has the beneficial effects that:
1. the invention adopts nitrogen as compressed gas, and the compressed gas is mixed with water and foam concentrate for foaming to extinguish fire, and the nitrogen is inert gas, so that the combustion supporting for fire can be avoided, the combustion inhibiting effect can be realized on the surface of a combustion substance, the suppression capability for the fire can be enhanced, and the fire extinguishing effect for the fire is better. Meanwhile, the nitrogen generator is arranged in the fire extinguishing system and used as a source of compressed nitrogen, so that the compressed nitrogen can be continuously supplied, the fighting capacity of the whole fire extinguishing system is improved, and the fire extinguishing system is particularly suitable for treating large-scale fire.
2. According to the invention, by changing the structure of the gas-liquid mixer, the mixing effect of water and foam liquid is improved, the mixing effect of foam mixed liquid and nitrogen is improved, the foaming effect of the foam liquid is improved, and the fire extinguishing effect of the fire extinguishing system is improved; in addition, the mixer of the invention simultaneously mixes the water, the foam liquid and the compressed nitrogen, but does not mix the water, the foam liquid and the compressed nitrogen step by step, thereby saving the foaming time of the foam liquid and improving the efficiency of fire rescue.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of a mixer in example 3 of the present invention;
FIG. 3 is a schematic structural view of a mixer in example 4 of the present invention;
shown in the figure: 11. a fire hose; 12. a first liquid flow meter; 13. adjusting a valve I; 14. a one-way valve I; 21. a foam liquid conveying pipe; 22. a second liquid flow meter; 23. a second regulating valve; 24. a second one-way valve; 31. a nitrogen conveying pipe; 32. a gas flowmeter, 33, a third regulating valve, 34 and a third one-way valve; 35. a stop valve; 36. a nitrogen storage tank; 37. a nitrogen generator; 38. an air cleaner; 4. a mixer; 41. a fire water inlet; 42. a foam liquid inlet; 43. a nitrogen inlet; 44. a foam liquid outlet; 45. a baffle plate; 46. a dispersion net; 47. a through hole; 48. a disperser; 49. a water inlet; 5. and a mixed liquid conveying pipe.
Detailed Description
The present invention will be described in further detail with reference to the following examples, but the present invention is not limited to the following examples.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
Example 1
As shown in FIG. 1, the foam fire extinguishing system of the present invention comprises a fire water source, a fire water delivery pipe 11, a foam concentrate storage tank, a foam concentrate delivery pipe 21, a nitrogen storage tank 36, a nitrogen delivery pipe 31, a mixer 4 and a mixed liquid delivery pipe 5; the fire-fighting water source can be a fire hydrant or a fire engine, etc.
The input end of the fire fighting water delivery pipe 11 is communicated with a fire fighting water source, and the output end is communicated with the mixer 4; the fire fighting water delivery pipe 11 is sequentially provided with a first liquid flow meter 12, a first regulating valve 13 and a first check valve 14; the liquid flow meter I12 is used for detecting the flow of water; the regulating valve I13 is used for regulating the water flow, and a proportional flow valve is selected; the first check valve 14 is used for preventing fire fighting water from flowing back into the first liquid flow meter 12.
The input end of the foam concentrate delivery pipe 21 is communicated with the foam concentrate storage tank, and the output end is communicated with the mixer 4; a second liquid flow meter 22, a second regulating valve 23 and a second one-way valve 24 are sequentially arranged on the foam liquid conveying pipe 21; the second liquid flow meter 22 is used for detecting the flow rate of the foam liquid; the second regulating valve 23 is used for regulating the flow of the foam liquid, and a proportional flow valve is selected; the second check valve 24 is used for preventing the foam liquid from flowing back into the second liquid flow meter 22.
The input end of the nitrogen conveying pipe 31 is communicated with the nitrogen storage tank 36, and the output end is communicated with the mixer 4; the nitrogen conveying pipe 31 is sequentially provided with a stop valve 35, a gas flowmeter 32, a third regulating valve 33 and a third one-way valve 34; the stop valve 35 plays a role in controlling the circulation and stop of nitrogen; the gas flow meter 32 is used for detecting the flow rate of nitrogen; the third regulating valve 33 is used for regulating the nitrogen flow; check valve three 34 prevents the foam mixture from flowing back into gas flow meter 32.
The output end of the mixer 4 is connected with a mixed liquid conveying pipe 5; the output end of the mixed liquid conveying pipe 5 can be connected with a foam nozzle and the like, so that the fire is sprayed and extinguished.
The system also comprises a nitrogen generator 37 and an air filter 38, wherein the nitrogen storage tank 36 is communicated with the nitrogen generator 37 and the air filter 38 in sequence through pipelines. The air is filtered by an air filter 38 and then enters a nitrogen generator 37 to generate nitrogen, and the nitrogen generator 37 can be a membrane separation nitrogen generating device.
Example 2
As shown in fig. 2, the present embodiment is an improvement of the structure of the mixer 4 on the basis of embodiment 1, and is specifically as follows.
The mixer 4 is provided with a fire-fighting water inlet 41, a foam concentrate inlet 42, a nitrogen inlet 43 and a foam concentrate outlet 44; the fire water inlet 41 and the foam liquid inlet 42 are respectively communicated with the output ends of the fire water delivery pipe 11 and the foam liquid delivery pipe 21, the fire water inlet 41 and the foam liquid inlet 42 are positioned at the top end of the mixer 4, and the fire water inlet 41 and the foam liquid inlet 42 are arranged at an angle; the nitrogen inlet 43 is communicated with the output end of the nitrogen delivery pipe 31, the nitrogen inlet 43 is positioned below the fire water inlet 41 and the foam concentrate inlet 42, and the nitrogen delivery pipe 31 is obliquely and upwardly connected to the mixer 4; inlets of fire fighting water 41 and foam concentrate 42 are arranged at the top end, and an inlet 43 of nitrogen is arranged at the lower end, so that the fire fighting water and the foam concentrate flow downwards while the nitrogen flows upwards, and the fire fighting water and the foam concentrate are mixed with the nitrogen more uniformly; the fire water inlet 41 and the foam liquid inlet 42 are arranged at an angle, so that the two liquids have certain cross flow while entering the mixer 4, and a vortex can be generated to achieve a good mixing effect.
A baffle plate 45 and a dispersion net 46 are arranged in the mixer 4; the baffle 45 is positioned below the fire water inlet 41 and the foam concentrate inlet 42 and above the nitrogen inlet 43; a dispersion screen 46 is positioned between nitrogen inlet 43 and foam concentrate outlet 44; the baffle 45 is obliquely fixed on the inner wall of the mixer 4, and in the embodiment, the included angle between the baffle 45 and the inner wall of the mixer 4 is 15-75 degrees; and the baffle 45 is provided with a plurality of through holes 47. Through setting up baffle 45, make fire water and foam concentrate carry out preliminary mixing on baffle 45 on the one hand, on the other hand, fire water and foam concentrate after the mixture flow into baffle 45 below through-hole 47 and mix with nitrogen gas, through the mixed liquid that has broken up fire water and foam concentrate, have increased the area of contact of mixed liquid with nitrogen gas, have improved mixed effect. Under the action of the nitrogen, the foam mixed liquid mixed with the nitrogen is blown out from the pores of the dispersion net 46, and the pores on the dispersion net 46 further foam the foam mixture, so that the uniform foam mixing is realized.
The baffle 45 and the dispersing net 46 are installed on the inner wall of the mixer 4, specifically, the inner wall of the mixer 4 is provided with a mounting groove, and the lower surface of the baffle 45 is provided with a matching mounting block, so that the baffle 45 can be installed on the inner wall of the mixer 4 by matching the mounting block with the mounting groove, and the baffle 45 can also be welded on the inner wall of the mixer 4. The inner wall of the mixer 4 is provided with a clamping block, the dispersing net 46 is provided with a matched clamping groove, and the dispersing net is arranged on the inner wall of the mixer 4 through the matching of the clamping block and the clamping groove.
In the present embodiment, the axial direction of the through hole 47 is perpendicular to the plane of the baffle 45. Because the baffle 45 forms an included angle with the inner wall of the mixer 4, a certain angle is formed between the axial direction of the through hole 47 and the axial direction of the mixer 4, namely the through hole 47 is obliquely arranged, so that the fire-fighting water and the foam concentrate flowing out of the through hole 47 form a vortex, the vortex refers to fluid which moves simultaneously along the axial direction and the radial direction of a conveying pipeline and is conveyed in a spiral mode, and the fluid has a good multi-medium mixing effect.
In this embodiment, the nitrogen inlet 43 is perpendicular to the plane of the baffle 45 and the through hole 47 is axially perpendicular to the plane of the baffle 45. The nitrogen inlet 43 is perpendicular to the plane of the baffle 45, so that the contact area of nitrogen entering from the nitrogen inlet 43 and foam mixed liquid flowing out from the baffle 45 is increased, and meanwhile, the foam mixed liquid and the nitrogen also have certain cross flow, so that the nitrogen inlet can generate vortex and have a good mixing effect.
Example 3
As shown in fig. 2, the present embodiment is an improvement of the structure of the mixer 4 on the basis of embodiment 2, and is specifically as follows.
The mixer 4 is also provided with a disperser 48 in the axial direction of the mixer 4, and the disperser 48 is provided with a conical structure, and the conical top of the conical structure faces the top end of the mixer 4. In this embodiment, the disperser 48 is provided with a conical tip, as shown in FIG. 2, which is directed vertically up to the top of the mixer 4. The fire fighting water inlet 41 and the foam liquid inlet 42 are symmetrically arranged at the top end of the mixer 4 by taking the axial direction of the mixer 4 as a symmetry axis, the fire fighting water conveying pipe 11 and the foam liquid conveying pipe 21 are obliquely and downwards connected to the mixer 4, and an included angle a of 30-75 degrees is formed between the fire fighting water conveying pipe 11 and the foam liquid conveying pipe 21; diffuser 48 is located below the intersection of extension lines of fire hose 11 and foam concentrate delivery pipe 21.
The disperser 48 may be mounted on the inner wall of the mixer 4 by a mounting bracket, and both ends of the mounting bracket are welded to the disperser 48 and the inner wall of the mixer 4, respectively.
The invention utilizes the conical top of the disperser 48 to break up the fire-fighting water and the foam liquid to disturb the liquid flow, so that the fire-fighting water and the foam liquid mixed liquid are fully mixed. Meanwhile, in the embodiment, the disperser 48 is located below the intersection point of the extension lines of the fire water delivery pipe 11 and the foam liquid delivery pipe 21, so that the fire water and the foam liquid entering from the fire water inlet 41 and the foam liquid inlet 42 can collide first to generate a vortex to have a good mixing effect and flow in a cross manner, and then collide with the conical top of the disperser 48 after the collision is performed, so that the liquid flow is further broken through the conical top, the fluid is disturbed, and the fire water and the foam liquid mixed liquid are fully mixed to obtain foam with uniform foaming and good performance.
Example 4
As shown in fig. 3, the present embodiment is an improvement of the structure of the mixer 4 on the basis of embodiment 2, and is specifically as follows.
Two conical tops are arranged on the disperser 48, and the two conical tops respectively face the fire water inlet 41 and the foam liquid inlet 42. The two conical tops of the disperser 48 are used for respectively crushing liquid flows of fire fighting water and foam liquid so as to disturb the fluid, so that the fire fighting water and the foam liquid mixed liquid are fully mixed, and meanwhile, after the conical tops are used for crushing the liquid flows of the fire fighting water and the foam liquid, the fire fighting water and the foam liquid collide with each other again, so that a vortex is generated, a good mixing effect is achieved, and foam with even foaming and good performance is obtained.
The disperser 48 may be mounted on the inner wall of the mixer 4 by a mounting bracket, and both ends of the mounting bracket are welded to the disperser 48 and the inner wall of the mixer 4, respectively.
In the present embodiment, the distributor 48 is further provided with a water passage port 49. Further, the water passage port 49 is located at the junction of the two tapered crests. Since the joint of the two conical tops has the lowest height, fire water and foam concentrate accumulate at the joint of the two conical tops and cannot be discharged, the fire water and foam concentrate accumulated on the disperser 48 can be further discharged by providing the water passage opening 49.
Example 5
The method for extinguishing fire by using the foam fire extinguishing system is characterized in that when a fire disaster occurs, a fire fighting water source, a foam liquid storage tank and a nitrogen storage tank 36 are started, a one-way valve I14, a one-way valve II 24, a one-way valve III 34 and a stop valve 35 are started, fire fighting water, foam liquid and nitrogen respectively enter a fire fighting water conveying pipe 11, a foam liquid conveying pipe 21 and a nitrogen conveying pipe 31 for conveying, the flow rates of the fire fighting water, the foam liquid and the nitrogen which pass through the fire fighting water conveying pipe are detected in real time through a liquid flow meter I12, a liquid flow meter II 22 and a gas flow meter 32 respectively, the mixing ratio of the fire fighting water, the foam liquid and the nitrogen is calculated, and if the mixing ratio does not meet the requirement, the flow rates of the fire fighting water, the foam liquid and the nitrogen are controlled by adjusting valve I13, adjusting valve II 23 and adjusting. Fire water, foam liquid and nitrogen gas that reach the proportion requirement carry out abundant mixed foaming in getting into blender 4, obtain the foam mixed liquid that accords with the requirement of putting out a fire, and in the foam mixed liquid entering mixed liquid conveyer pipe, the output and the foam shower nozzle etc. of mixed liquid conveyer pipe were connected to can spray the conflagration and put out a fire.
The invention can also adopt a control unit in the prior art to control the foam fire extinguishing system, the control unit is electrically connected with the liquid flow meter I12, the regulating valve I13, the liquid flow meter II 22, the regulating valve II 23, the stop valve 35, the gas flow meter 32, the regulating valve III 33, the check valve I14, the check valve II 24 and the check valve III 34 in the prior art, the liquid flow meter I12, the liquid flow meter II 22 and the gas flow meter 32 transmit monitoring data to the control unit, the control unit calculates the mixing proportion of the fire fighting water, the foam liquid and the nitrogen and compares the mixing proportion with the set mixing proportion, when the mixing proportion is not in the set proportion range, the control unit controls the opening and closing of the regulating valve I13, the regulating valve II 23 and the regulating valve III 33 to adjust the flow, so that the fire fighting water, the foam liquid and the nitrogen reach the set mixing proportion, improving the fire extinguishing effect of the foam liquid.
The above are merely characteristic embodiments of the present invention, and do not limit the scope of the present invention in any way. All technical solutions formed by equivalent exchanges or equivalent substitutions fall within the protection scope of the present invention.
Claims (8)
1. A foam fire suppression system characterized by: the fire fighting water supply system comprises a fire fighting water source, a fire fighting water delivery pipe (11), a foam concentrate storage tank, a foam concentrate delivery pipe (21), a nitrogen storage tank (36), a nitrogen delivery pipe (31), a mixer (4) and a mixed liquid delivery pipe (5);
the input end of the fire fighting water delivery pipe (11) is communicated with the fire fighting water source, and the output end of the fire fighting water delivery pipe is communicated with the mixer (4); the fire fighting water delivery pipe (11) is sequentially provided with a liquid flow meter I (12), a regulating valve I (13) and a one-way valve I (14);
the input end of the foam concentrate conveying pipe (21) is communicated with the foam concentrate storage tank, and the output end of the foam concentrate conveying pipe is communicated with the mixer (4); a second liquid flow meter (22), a second regulating valve (23) and a second one-way valve (24) are sequentially arranged on the foam liquid conveying pipe (21);
the input end of the nitrogen conveying pipe (31) is communicated with the nitrogen storage tank (36), and the output end of the nitrogen conveying pipe is communicated with the mixer (4); the nitrogen conveying pipe (31) is sequentially provided with a stop valve (35), a gas flowmeter (32), a third regulating valve (33) and a third check valve (34);
the output end of the mixer (4) is connected with the mixed liquid conveying pipe (5);
the system also comprises a nitrogen generator (37) and an air filter (38), wherein the nitrogen storage tank (36) is sequentially communicated with the nitrogen generator (37) and the air filter (38) through pipelines;
the mixer (4) is provided with a fire water inlet (41), a foam liquid inlet (42), a nitrogen inlet (43) and a foam liquid outlet (44);
the fire fighting water inlet (41) and the foam liquid inlet (42) are respectively communicated with the output ends of the fire fighting water delivery pipe (11) and the foam liquid delivery pipe (21), the fire fighting water inlet (41) and the foam liquid inlet (42) are positioned at the top end of the mixer (4), and the fire fighting water inlet (41) and the foam liquid inlet (42) are arranged at an angle;
the nitrogen inlet (43) is communicated with the output end of the nitrogen conveying pipe (31), the nitrogen inlet (43) is positioned below the fire water inlet (41) and the foam concentrate inlet (42), and the nitrogen conveying pipe (31) is obliquely and upwardly connected to the mixer (4);
a baffle plate (45) and a dispersion net (46) are arranged in the mixer (4); the baffle (45) is positioned below the fire water inlet (41) and the foam concentrate inlet (42) and above the nitrogen inlet (43); said dispersion screen (46) being located between said nitrogen inlet (43) and said foam concentrate outlet (44); the baffle (45) is obliquely fixed on the inner wall of the mixer (4), and a plurality of through holes (47) are formed in the baffle (45);
the method for extinguishing fire by adopting the system comprises the following steps: opening a fire-fighting water source, a foam liquid storage tank and a nitrogen storage tank (36), opening a one-way valve I (14), a one-way valve II (24), a one-way valve III (34) and a stop valve (35), enabling fire-fighting water, foam liquid and nitrogen to respectively enter a fire-fighting water conveying pipe (11), a foam liquid conveying pipe (21) and a nitrogen conveying pipe (31) for conveying, respectively detecting the flow of fire-fighting water, foam liquid and nitrogen in real time through a liquid flow meter I (12), a liquid flow meter II (22) and a gas flow meter (32), calculating the mixing proportion of the fire-fighting water, the foam liquid and the nitrogen, and adjusting a regulating valve I (13), a regulating valve II (23) and a regulating valve III (33) to control the flow of the fire-fighting water, the foam liquid and the nitrogen so as to achieve a proper mixing proportion if the mixing proportion does; fire water, foam liquid and nitrogen gas that reach the proportion requirement carry out abundant mixed foaming in getting into blender (4), obtain the foam mixed liquid that accords with the requirement of putting out a fire, and in the foam mixed liquid got into mixed liquid conveyer pipe (5), the output and the foam shower nozzle of mixed liquid conveyer pipe (5) were connected, and the fire is put out a fire in spraying.
2. A foam fire suppression system according to claim 1, wherein: still be equipped with in blender (4) and be located axial ascending deconcentrator (48) of blender (4), be the toper structure on deconcentrator (48), the toper top of toper structure is up.
3. A foam fire suppression system according to claim 2, wherein: the fire fighting water inlet (41) and the foam concentrate inlet (42) are symmetrically arranged at the top end of the mixer (4) by taking the axial direction of the mixer (4) as a symmetry axis; the disperser (48) is provided with a conical top which faces upwards to the top end of the mixer (4) along the vertical direction.
4. A foam fire suppression system according to claim 3, wherein: the fire fighting water delivery pipe (11) and the foam liquid delivery pipe (21) are obliquely and downwards connected to the mixer (4), and an included angle of 30-75 degrees is formed between the fire fighting water delivery pipe (11) and the foam liquid delivery pipe (21); the disperser (48) is positioned below the intersection point of extension lines of the fire water conveying pipe (11) and the foam liquid conveying pipe (21).
5. A foam fire suppression system according to claim 2, wherein: two conical tops are arranged on the disperser (48), and face the fire water inlet (41) and the foam liquid inlet (42) respectively.
6. A foam fire suppression system according to claim 5, wherein: the disperser (48) is also provided with a water through hole (49).
7. A foam fire suppression system according to claim 2, wherein: the baffle (45) with the contained angle of blender (4) inner wall is 15~ 75.
8. A foam fire suppression system according to claim 7, wherein: the nitrogen inlet (43) is perpendicular to the plane of the baffle plate (45), and the axial direction of the through hole (47) is perpendicular to the plane of the baffle plate (45).
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| CN201007219Y (en) * | 2007-02-15 | 2008-01-16 | 煤炭科学研究总院重庆分院 | High power inhibition foam-making apparatus for preventing and controlling coal spontaneous combustion |
| US20100175897A1 (en) * | 2009-01-13 | 2010-07-15 | Stephen Douglas Crump | Self-sustaining compressed air foam system |
| CN202822546U (en) * | 2011-11-12 | 2013-03-27 | 天津凯德实业有限公司 | Vehicle-mounted type nitrogen foam fire extinguishing device and fire fighting vehicle |
| CN104906731B (en) * | 2015-05-27 | 2018-04-24 | 中国石油化工股份有限公司青岛安全工程研究院 | A kind of gas-liquid-solid three-phase fluid mixing arrangement |
| CN105879269A (en) * | 2016-06-03 | 2016-08-24 | 四川川消消防车辆制造有限公司 | Compressed nitrogen and foam fire-extinguishing system |
| CN108525163A (en) * | 2017-03-01 | 2018-09-14 | 中国石油化工股份有限公司 | Foam-generating device and fire extinguisher |
| CN208694099U (en) * | 2018-08-10 | 2019-04-05 | 大连大兵救援装备有限公司 | Engine compressed air foam fire extinguishing unit |
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