CN107823821B - Water mist fire extinguishing system capable of accurately mixing fire extinguishing liquid in real time and application method thereof - Google Patents

Abstract

A water mist fire extinguishing system and an application method capable of accurately mixing fire extinguishing liquid in real time, wherein the system comprises a water tank, a water mist pump set and a water mist nozzle which are sequentially communicated through a pipeline, and further comprises a fire extinguishing liquid instant mixing system, wherein the fire extinguishing liquid instant mixing system comprises a pressure reducing and taking device, a fire extinguishing liquid capsule tank, a flow regulating device and a fire extinguishing liquid mixer which are sequentially communicated; the inlet of the pressure reducing and taking device is communicated with the water outlet of the water mist pump set, and the fire extinguishing fluid mixer is communicated with the water outlet of the water tank and the water inlet of the water mist pump set; and part of high-pressure water output by the water mist pump set flows through the fire-extinguishing fluid capsule tank after being decompressed by the pressure-reducing and pressure-taking device, the fire-extinguishing fluid in the fire-extinguishing fluid capsule tank is extruded out at constant pressure, is output in proportion by the flow regulating device to be accurately mixed with water in the fire-extinguishing fluid mixer, and is pressurized by the water mist pump set and then is sprayed out at high pressure. The fire extinguishing system has the advantages of simple structure, simplicity and convenience in operation, high mixing precision, high stability, good economy and the like.

Description

A fine water mist fire extinguishing system capable of accurately mixing fire extinguishing liquid in real time and its application method

technical field

The invention relates to the technical field of fire protection, in particular to a fine water mist fire extinguishing system capable of accurately mixing fire extinguishing liquid in real time and an application method thereof.

Background technique

、Dv₉₉ 小于400

的水雾雾滴进行灭火。近些年，为 了进一步提升细水雾的灭火效果，人们将水系灭火液作为细水雾添加剂预混合至水中，然 后细化成细水雾进行灭火。但是，这些水系灭火液大都由碱性盐类（如论文Fire Safety Journal, 41 (2006) 39-45）、氟碳表面活性剂（如论文Procedia Engineering, 45 ( 2012 ) 649-654）等组成，具有一定腐蚀性，长期储存会造成对细水雾泵组、水箱、管道、阀 门等造成严重腐蚀。因此，现今亟需一种能实时精确混合灭火液的细水雾灭火系统。平时未 灭火应用时，灭火液和细水雾系统相分离，灭火液不腐蚀设备和管道。 Fine water mist is an efficient fire extinguishing technology. This technology uses high-pressure water pumps and fine water mist nozzles to decompose the water flow into diameters Dv ₅₀ less than 200

、Dv ₉₉ less than 400

water mist droplets to extinguish the fire. In recent years, in order to further improve the fire extinguishing effect of fine water mist, people pre-mix water-based fire extinguishing fluid as a fine water mist additive into water, and then refine it into fine water mist for fire extinguishing. However, most of these water-based fire extinguishing fluids are composed of alkaline salts (such as the paper Fire Safety Journal , 41 (2006) 39-45), fluorocarbon surfactants (such as the paper Procedia Engineering , 45 (2012) 649-654), etc. It is corrosive to a certain extent, and long-term storage will cause serious corrosion to the water mist pump unit, water tank, pipes, valves, etc. Therefore, there is an urgent need for a water mist fire extinguishing system that can accurately mix fire extinguishing liquid in real time. When it is not used for fire extinguishing, the fire extinguishing liquid and the fine water mist system are separated, and the fire extinguishing liquid does not corrode the equipment and pipelines.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, to provide a simple structure, easy operation, high mixing precision, high stability, good economy, long service life of the equipment, which can realize fine water mist and fire extinguishing liquid The invention relates to a fine water mist fire extinguishing system for real-time and precise mixing of fire extinguishing liquid in the fire extinguishing process and an application method thereof.

A water mist fire extinguishing system capable of accurately mixing fire extinguishing liquid in real time, comprising a water tank, a water mist pump group and a water mist nozzle connected in sequence through pipelines, and also includes a fire extinguishing liquid instant mixing system, the fire extinguishing liquid is mixed immediately The system includes a pressure-reducing and pressure-taking device, a fire extinguishing liquid capsule tank, a flow regulating device and a fire-extinguishing liquid mixer connected in sequence; the inlet of the pressure-reducing and pressure-taking device communicates with the water outlet of the water mist pump group, The liquid mixer is connected to the water outlet of the water tank and the water inlet of the water mist pump group; part of the high-pressure water output by the water mist pump group is decompressed by the pressure-reducing device and flows through the fire extinguishing liquid capsule tank , the fire extinguishing fluid is extruded at a constant pressure, and then output in proportion through the flow regulating device, accurately mixed with water in the fire extinguishing fluid mixer, and then pressurized by the fine water mist pump group and then sprayed out at high pressure.

As a further improvement of the above technical solution:

Preferably, a flow meter, a one-way valve and a switch valve are sequentially provided on the communication pipeline between the flow regulating device and the fire extinguishing fluid mixer; safety valve.

Preferably, the water mist pump set is a plunger pump, the pressure of which is 1.5-16.0 MPa, and the pressure reducing device reduces the high-pressure water to a low pressure of 0.35-1.5 MPa.

Preferably, the pressurized pressure is 2.5-10.0 MPa, and the low pressure is 0.5-1.0 MPa.

Preferably, the fire extinguishing liquid is a water-soluble fire extinguishing agent, including _NaCl , KCl, KHCO in the aqueous solution of alkali metal salts and hydrocarbon surfactants, fluorocarbon surfactants in the aqueous organic surfactant solution; fire extinguishing liquid and The mixing ratio of water precise mixing is 0.2-6%.

Preferably, the pressure-reducing and pressure-taking device adopts one or a combination of pressure reducing and stabilizing valves, electric pressure regulating valves, and self-operated pressure regulating valves.

Preferably, the flow regulating device adopts one or a combination of self-operated flow control valves, electric control flow control valves, pneumatic flow control valves, proportional valves, and static flow balance valves.

Preferably, the fire extinguishing liquid capsule tank has a double-layer structure, including an inner capsule layer and an outer shell layer, and the water outlet end of the pressure-reducing and pressure-taking device communicates with the interlayer between the capsule layer and the shell layer through a pipeline , the fire extinguishing liquid in the capsule layer is output after being squeezed by the constant-pressure and low-pressure water flowing into the interlayer.

Preferably, the fire extinguishing fluid mixer is one of pipeline mixer, vortex mixer, static mixer and Venturi mixer.

The present invention also provides an application method of the above-mentioned fine water mist fire extinguishing system, comprising the following steps:

First adjust the pressure-reducing device to the design pressure;

Then calculate and obtain the total flow of fire extinguishing water according to the quantity and flow of fine water mist nozzles;

Finally, according to the set fire extinguishing fluid mixing ratio, combined with the total flow of fire extinguishing water, the constant pressure replacement volume of the fire extinguishing fluid is adjusted by adjusting the flow regulating device, and a fine water mist mixed with a fixed ratio of fire extinguishing fluid is obtained to realize the fire extinguishing fluid and water. Hybrid application.

Compared with the prior art, the present invention has the advantages of:

1. The fine water mist fire extinguishing system of the present invention that can accurately mix the fire extinguishing liquid in real time, connects the pressure-reducing pressure taking device, the fire extinguishing liquid capsule tank, and the flow regulating device in sequence and incorporates them into the outlet and inlet of the fine water mist pump group. The regulating device can accurately control the flow of the fire extinguishing liquid, and obtain the fire extinguishing liquid with a fixed mixing ratio, so as to adapt to the different fire extinguishing water flow rates used in different fire extinguishing places. Part of the high-pressure water in the water mist pump unit is decompressed by the pressure-reducing device and then flows through the fire-extinguishing liquid capsule tank. Accurate mixing, and then pressurized by the fine water mist pump group and then sprayed under high pressure, can realize the instant and accurate mixing of fine water mist and fire extinguishing liquid during the fire extinguishing process.

2. In the water mist fire extinguishing system of the present invention, an on-off valve is provided on the connecting pipe between the flow regulating device and the fire extinguishing fluid mixer. After closing the on-off valve and turning on the water mist pump group, the mixed fire extinguishing application of the fire extinguishing fluid can be stopped. 1. Clean the fire extinguishing fluid mixing system and use fine water mist alone to extinguish the fire, which has the advantages of optional fire extinguishing methods at any time and easy cleaning of the fire extinguishing fluid mixing system. The liquid does not corrode equipment and pipelines. There is a safety valve on the pipeline connecting the pressure-reducing device and the fire extinguishing liquid capsule tank, which can ensure the safety of the pressure of the fire extinguishing liquid tank; Protection of fire extinguishing fluid tanks.

In summary, the water mist fire extinguishing system of the present invention can realize instant mixing of water mist and fire extinguishing liquid during the fire extinguishing process, and has the advantages of simple structure, high mixing precision, high stability, and good economy. The application method of the invention is easy to operate.

Description of drawings

Fig. 1 is a schematic structural diagram of a fine water mist fire extinguishing system capable of mixing fire extinguishing liquid accurately in real time according to the present invention.

illustration:

1. Water mist pump group; 2. Water tank; 3. Pressure-reducing and pressure-taking device; 4. Safety valve; 5. Fire extinguishing liquid capsule tank; 6. Fire extinguishing liquid; , one-way valve; 10, fine water mist nozzle; 11, switch valve; 12, fire extinguishing fluid mixer.

detailed description

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, the water mist fire extinguishing system of this embodiment that can accurately mix fire extinguishing liquid in real time includes a water tank 2, a water mist pump set 1, a water mist nozzle 10, and a fire extinguishing liquid instant mixing system, the water tank 2. The water mist pump group 1 and the water mist nozzle 10 are connected in sequence through pipelines, and the fire extinguishing liquid instant mixing system includes a step-down and pressure taking device 3 connected in sequence, a fire extinguishing liquid capsule tank 5, a flow regulating device 7 and a fire extinguishing liquid mixer 12. The inlet of the step-down and pressure-taking device 3 is connected to the water outlet of the water mist pump group 1, and the fire extinguishing fluid mixer 12 is connected to the water outlet of the water tank 2 and the water inlet of the water mist pump group 1; the water mist pump group 1. Part of the high-pressure water output is decompressed by the pressure-reducing device 5 and then flows through the fire-extinguishing liquid capsule tank 5. The fire-extinguishing liquid 6 is squeezed out at a constant pressure and output in proportion to the fire-extinguishing liquid mixer 12 through the flow regulating device 7. It is precisely mixed with water, and then pressurized by the fine water mist pump unit 1 and sprayed out at high pressure. The invention can realize the real-time and precise mixing of the fine water mist and the fire extinguishing liquid during the fire extinguishing process, and has the advantages of simple structure, convenient operation, high mixing precision, high stability and good economy.

In this embodiment, a flow meter 8, a one-way valve 9 and an on-off valve 11 are sequentially provided on the connecting pipeline between the flow regulating device 7 and the fire extinguishing fluid mixer 12; wherein the flow meter is used to measure the flow rate of the fire extinguishing fluid to realize The flow rate of fire extinguishing fluid can be adjusted. The one-way valve is used to prevent the water at the inlet of the water mist pump unit from flowing into the fire extinguishing liquid tank. The switch valve can be one of globe valve, butterfly valve, ball valve, solenoid valve and electric ball valve, and it is used to stop the mixed fire extinguishing application of fire extinguishing fluid after closing.

In this embodiment, the fire extinguishing fluid mixer 12 is one of pipeline mixer, vortex mixer, static mixer and Venturi mixer. The flow regulating device 7 adopts one or more combination of self-operated flow control valve, electric control flow control valve, air control flow regulating valve, proportional valve and static flow balance valve, to precisely control the flow of fire extinguishing fluid , so that the fire extinguishing water flow rate used for different fire extinguishing places is different. The method of adjusting the mixed flow rate of the fire extinguishing fluid is to perform a calibration test on the mixed flow rate before the field application. The calibration process is as follows: according to the designed mixing ratio of the fire extinguishing fluid, the pressure of the pressure drop, and the different water mist fire extinguishing flow rates, the test Obtain the opening degree of the flow regulating device, and obtain the designed mixing ratio of fine water mist and fire extinguishing fluid.

In this embodiment, the pressure-reducing and pressure-taking device 3 adopts one or a combination of pressure reducing and stabilizing valves, electric pressure regulating valves, and self-operated pressure regulating valves. A safety valve 4 is provided on the pipeline connecting the pressure reducing device 3 and the fire extinguishing liquid capsule tank 5 to ensure the safety of the pressure of the fire extinguishing liquid tank; when the pressure in the fire extinguishing liquid tank exceeds the safety upper limit of the safety valve, the safety valve starts Release the pressure to form the protection of the fire extinguishing fluid tank.

In this embodiment, the fire extinguishing liquid capsule tank 5 is a double-layer structure, including an inner capsule layer and an outer shell layer, and the water outlet of the pressure-reducing device 3 communicates with the interlayer between the capsule layer and the shell layer through a pipeline. , the fire extinguishing fluid 6 in the capsule layer is output after being extruded by the constant-pressure and low-pressure water flowing into the interlayer. Since the capsule is squeezed by a constant pressure, the output of the fire extinguishing liquid is basically constant, with good stability and high mixing accuracy.

In this embodiment, the fine water mist pump group 1 is a plunger pump, and its pressurized pressure is 1.5-16.0 MPa (preferably 2.5-10.0 MPa). 0.35-1.5 MPa (preferably 0.5-1.0 MPa).

In the present embodiment, the fire extinguishing liquid 6 is a water-soluble fire extinguishing agent, including _NaCl , KCl, KHCO in an aqueous solution of alkali metal salts and hydrocarbon surfactants and fluorocarbon surfactants in an aqueous solution of organic surfactants; the fire extinguishing liquid The mixing ratio of 6 and water is 0.2-6%, and it can be adjusted step by step.

The using method of the fine water mist fire extinguishing system of real-time and accurate mixed fire extinguishing liquid of the present invention is as follows:

。 First, adjust the pressure-reducing device 3 (self-operated pressure regulating valve group) to 0.8 MPa; then calculate the total flow of fire extinguishing water according to the number and flow of fine water mist nozzles. In this embodiment, 30 fine water mist nozzles are shared as an example, and the flow rate of a single nozzle is 10L/min, so the total fire extinguishing flow rate of fine water mist is

.

。因此，通过调节流量调节装置7（自力式流量控制阀组），试验 获得灭火液混合比为5%的阀组开度，实现混合比为5%的灭火液和细水雾混合灭火应用。 According to the set fire extinguishing fluid mixing ratio of 5%, combined with the total fire extinguishing water flow rate of 300L/min, it can be known that the mixing amount of fire extinguishing fluid is

. Therefore, by adjusting the flow regulating device 7 (self-operated flow control valve group), the opening of the valve group with a mixing ratio of 5% of the fire extinguishing fluid was obtained in the test, and the mixed fire extinguishing application of the fire extinguishing fluid and fine water mist with a mixing ratio of 5% was realized.

The above descriptions are only preferred implementations of the present invention, and the scope of protection of the present invention is not limited to the above examples. For those skilled in the art, improvements and transformations obtained without departing from the technical concept of the present invention should also be regarded as the protection scope of the present invention.

Claims (9)

1. The utility model provides a can real-time accurate water mist fire extinguishing systems who mixes fire-extinguishing liquid, includes water pitcher (2), water mist pump group (1) and water mist nozzle (10) that communicate in proper order through the pipeline, its characterized in that: the system also comprises an instant fire-extinguishing liquid mixing system, wherein the instant fire-extinguishing liquid mixing system comprises a pressure reduction and taking device (3), a fire-extinguishing liquid capsule tank (5), a flow regulating device (7) and a fire-extinguishing liquid mixer (12) which are sequentially communicated; the inlet of the pressure reducing and taking device (3) is communicated with the water outlet of the water mist pump set (1), and the fire extinguishing fluid mixer (12) is communicated with the water outlet of the water tank (2) and the water inlet of the water mist pump set (1); part of high-pressure water output by the water mist pump set (1) is decompressed by the decompression pressure-taking device (5) and then flows through the fire-extinguishing liquid capsule tank (5), fire-extinguishing liquid (6) in the water mist pump set is extruded out at constant pressure and is output in proportion by the flow regulating device (7) to be accurately mixed with water in the fire-extinguishing liquid mixer (12), and then is pressurized by the water mist pump set (1) and then is sprayed out at high pressure;

a flow meter (8), a one-way valve (9) and a switch valve (11) are sequentially arranged on a communication pipeline between the flow regulating device (7) and the fire extinguishing fluid mixer (12); a safety valve (4) is arranged on a pipeline communicated with the pressure reducing and taking device (3) and the fire extinguishing liquid capsule tank (5); the one-way valve (9) is used for preventing water at the water inlet of the water mist pump set (1) from flowing into the fire extinguishing liquid capsule tank (5).

2. The water mist fire suppression system of claim 1, wherein: the water mist pump set (1) is a plunger pump, the pressurizing pressure of the water mist pump set is 1.5-16.0 MPa, and the pressure reducing and taking device (3) reduces the pressure of high-pressure water to the low pressure of 0.35-1.5MPa.

3. The water mist fire suppression system of claim 2, wherein: the pressurizing pressure is 2.5-10.0MPa, and the low pressure is 0.5-1.0MPa.

4. The water mist fire suppression system of claim 1, wherein: the fire extinguishing liquid (6) is a water-soluble fire extinguishing agent and comprises NaCl, KCl and KHCO3 in an alkali metal salt aqueous solution and a hydrocarbon surfactant and a fluorocarbon surfactant in an organic surfactant aqueous solution; the mixing ratio of the fire extinguishing liquid (6) and water which are accurately mixed is 0.2-6%.

5. The water mist fire suppression system of claim 1, wherein: the pressure reducing and taking device (3) adopts one or a combination of a pressure reducing and stabilizing valve, an electric pressure regulating valve and a self-operated pressure regulating valve.

6. The water mist fire suppression system of claim 1, wherein: the flow regulating device (7) adopts one or a combination of a plurality of self-operated flow control valves, electric control flow control valves, pneumatic control flow regulating valves, proportional valves and static flow balance valves.

7. The water mist fire suppression system of claim 1, wherein: fire-extinguishing fluid capsule jar (5) are bilayer structure, including the capsule layer and the outer shell layer of nexine, the play water end of step-down pressure-taking device (3) passes through the intermediate layer intercommunication between pipeline and capsule layer and the shell layer, and intraformational fire-extinguishing fluid of capsule (6) are exported after the extrusion of the low pressure water of constant pressure that flows into the intermediate layer.

8. The water mist fire suppression system of claim 1, wherein: the fire extinguishing fluid mixer (12) is one of a pipeline mixer, a vortex mixer, a static mixer and a Venturi mixer.

9. A method of using the water mist fire suppression system of claim 1, wherein: the method comprises the following steps: firstly, adjusting a pressure reduction and taking device (3) to a design pressure; then, calculating and obtaining the total flow of water for fire extinguishing according to the quantity and the flow of the water mist spray heads (10); and finally, according to the set mixing ratio of the fire-extinguishing liquid, the constant-pressure replacement amount of the fire-extinguishing liquid is adjusted by combining the total flow of the fire-extinguishing water and adjusting a flow adjusting device (7), so that the water mist mixed with the fire-extinguishing liquid in a fixed ratio is obtained, and the mixed application of the fire-extinguishing liquid and water is realized.

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