Foam generation method and its application and fire extinguishing method

A generation method and technology of foam, applied in chemical instruments and methods, fire rescue, transportation and packaging, etc., can solve problems such as lack of layout space, large space occupation, high-flow high-pressure compressed gas supply, etc., and achieve independent work ability Strong, small footprint, fast response effects

Active Publication Date: 2021-05-28
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, compressed gas foam fire extinguishing usually uses gas compressors, high-pressure gas pipe networks or compressed gas cylinders for gas supply, and the gas supply of gas compressors and compressed gas cylinders is limited, which cannot meet the needs of large flow, high pressure, and long-term supply. However, most places do not have a high-pressure gas pipeline network, and if large flow, high pressure, and long-term gas supply are required, multiple compressors or compressed gas cylinders (such as one with a flow rate of 150L / S Take the foam fire truck as an example, the gas supply flow rate is at least 1050L / s, and its gas supply needs to be supplied by multiple large air compressors), which takes up a lot of space, and there is often no space for layout in the oil depot tank area and equipment area. Not conducive to site layout
[0003] Another type of gas storage foam fire extinguishing usually stores compressed gas in the fire extinguishing agent container. When a large flow rate is sprayed, the compressed gas will be consumed in large quantities. Gas, and in the state of large-flow injection, the air compressor and compressed gas cylinder alone cannot guarantee sufficient supply of compressed gas, resulting in the inability to effectively meet the requirements of high-pressure injection. As the injection continues, the pressure in the container decreases significantly. The performance of the foam gradually deteriorates, which affects the fire extinguishing effect
When extinguishing a major fire, it is necessary to produce large-flow high-expansion foam for fire extinguishing. At this time, the flow rate of the foam mixture increases, and the gas supply volume of the compressed gas also needs to increase accordingly. However, the existing gas supply method cannot achieve high-flow high-pressure compression. For the supply of gas, the maximum foam mixture flow rate of the current compressed gas foam fire truck is only 15-20L / s. Application in tank fires or large-scale ground flow fires

Method used

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  • Foam generation method and its application and fire extinguishing method
  • Foam generation method and its application and fire extinguishing method
  • Foam generation method and its application and fire extinguishing method

Examples

Experimental program
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Embodiment approach

[0025] According to a preferred embodiment of the present invention, the gas source is a liquefied medium, preferably the liquefied medium is at least one of liquid nitrogen, liquid carbon dioxide, liquefied inert gas, and liquefied halogenated hydrocarbon gas.

[0026] When the gas source is a liquefied medium, since the liquefied medium is vaporized into a gas at normal room temperature, the gas can be obtained without additional operations. Therefore, when the gas source is a liquefied medium, the mixing method includes passing the gas source in the form of a liquid flow into the foaming substance for mixing. Since the foaming substance is generally at ambient temperature and mixing is usually carried out at ambient temperature, the liquefied medium is vaporized when entering the mixer and in contact with the foaming substance, generating a large amount of gas, thereby performing foaming.

[0027] Aiming at the supply problem of large-flow compressed gas, the present invent...

preparation example 1

[0135] The nitrocellulose with a water content of 20% by weight (with a nitrogen content of 12% by weight) was dehydrated in a centrifuge so that the water content was not greater than 0.15% by weight.

[0136] 100 parts by weight of the above-mentioned dehydrated nitrocellulose, 2 parts by weight of diphenylamine, 50 parts by weight of nitroguanidine and 7 parts by weight of ferric oxide are dissolved in a mixed solvent of 100 parts by weight of ether and 100 parts by weight of ethanol, and then kneaded Mix and plasticize in the machine at 20°C for 60 minutes.

[0137] Make the above mixture into a cylinder, and dry it at 30°C for 8 hours to obtain a 15kg medicament column, denoted as chemical gas-generating medicament A1, with a density of 1.2g / cm 3 , n is 600, the gas production rate is 125L / s / kg, and the continuous gas production time is 1min. Test method of gas production rate: put 500g of medicine in 1m 3 In the box, start the agent and start the reaction. After the re...

preparation example 2

[0139] Dry the sodium azide, sodium nitrate and ferrous sulfide in an oven at 70°C for 2 hours so that the moisture content is not greater than 0.15%.

[0140] The dried sodium azide is mixed with aluminum oxide and magnesium trisilicate in a weight ratio of 58:0.2:0.2, and then put into a ball mill to grind until the average particle size of the mixture is 15 microns.

[0141] The dried sodium nitrate is mixed with aluminum oxide and magnesium trisilicate in a weight ratio of 3:0.2:0.2, and then put into a ball mill to grind until the average particle size of the mixture is 15 microns.

[0142] Put the ferrous sulfide into a ball mill and grind it until the average particle size is 15 microns.

[0143] Mix the mixture of ferrous sulfide, sodium azide, and sodium nitrate obtained by the above ball milling in a ratio of 38:58:4 by weight and load it into a ball mill for grinding. The ball milling time is 1 hour, and the average particle size is 10 microns. Then, dry it in an ...

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Abstract

The invention discloses a foam generation method and its application in fire extinguishing and a fire extinguishing method, said foam generation method comprising mixing a gas with a foaming substance so as to cause the foaming substance to generate foam, at least part of said gas being generated instantaneously by a gas source, And the ratio of the gas volume that the gas source can generate to the volume of the gas source is not lower than 40. The foam production method of the present invention adopts the method of mixing the gas generated by the gas source in situ and the foaming substance for the first time. Since the volume ratio of the gas volume generated by the gas source to the gas source is relatively high, the stored gas can be greatly reduced. The volume of the container of the source, the small-volume storage equipment can replace the huge air compressor, air compressor unit or other high-pressure gas storage equipment. The present invention uses inert media such as liquid nitrogen to participate in foam foaming, and inert gases will be released after the foam bursts. These inert gases can also inhibit combustion on the surface of burning substances, and help to accelerate fire extinguishing.

Description

technical field [0001] The present invention relates to foam generation methods and their use in fire extinguishing and fire extinguishing methods. Background technique [0002] Existing compressed gas foam fire extinguishing mainly adopts the mode of mixing high-pressure gas and foam mixture to generate foam to extinguish fire. The specific foam fire extinguishing methods mainly include two kinds of pressure-stabilized compressed gas foam fire extinguishing and gas storage foam fire extinguishing. Among them, compressed gas foam fire extinguishing usually uses gas compressors, high-pressure gas pipe networks or compressed gas cylinders for gas supply, and the gas supply of gas compressors and compressed gas cylinders is limited, which cannot meet the needs of large flow, high pressure, and long-term supply. However, most places do not have a high-pressure gas pipeline network, and if large flow, high pressure, and long-term gas supply are required, multiple compressors or ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A62C5/02
CPCA62C5/02A62C99/0036A62C99/0018A62C3/06A62C3/065B01F2215/0422B01F2215/0427B01F2215/0431B01F2215/045B01F2215/0468B01F2215/0472B01F23/235B01F25/3131B01F25/31112B01F25/31113B01F27/112
Inventor 牟小冬郎需庆牟善军姜春明尚祖政吴京峰谈龙妹于辉王林陶彬刘全桢
Owner CHINA PETROLEUM & CHEM CORP
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