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Foam production device adopting chemical reactions

A technology for generating devices and foam, applied in fire rescue and other directions, can solve problems such as unfavorable on-site layout, large occupied space, and no space for layout, and achieve the effect of convenient on-site layout, small occupied space, and low manufacturing cost

Pending Publication Date: 2018-09-14
CHINA PETROLEUM & CHEM CORP +1
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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. Gas requirements, and most places do not have high-pressure gas pipeline network
However, if large flow, high pressure, and long-term gas supply are required, multiple compressors or compressed gas cylinders need to be installed (for example, a foam fire engine with a flow rate of 150L / S, the gas supply flow rate should be at least 1050L / S s, its gas supply needs to be supplied by multiple large air compressors), it takes up a lot of space, and there is often no space for layout in the oil depot tank area and equipment area, which is not conducive to on-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 production device adopting chemical reactions
  • Foam production device adopting chemical reactions
  • Foam production device adopting chemical reactions

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0047] The co-solvent can be a substance that helps to dissolve nitrocellulose and a stabilizer in the solvent during the preparation of the gas-generating substance, preferably one of dinitrotoluene, camphor, nitrobenzene or Several kinds. Based on 100 parts by weight of nitrocellulose, the content of co-solvent may be 0-20 parts by weight, preferably 0.1-15 parts by weight, more preferably 0.3-10 parts by weight.

[0048] In order to increase the gas production rate of sodium azide, it is preferably used in conjunction with additives, alkali metal nitrates, metal sulfides and / or metal oxides. Based on the total weight of chemical gas-generating substances, the content of sodium azide is 45-60% by weight, the content of metal sulfide and / or metal oxide is 35-50% by weight, and the content of alkali metal nitrate The content is 1.5-5% by weight, and the content of the auxiliary agent is 0.5-6% by weight.

[0049]The auxiliary agent is preferably one or more of molybdenum dis...

preparation example 1

[0121] 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.

[0122] 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.

[0123] 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

[0125] 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%.

[0126] 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.

[0127] 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.

[0128] Put the ferrous sulfide into a ball mill and grind it until the average particle size is 15 microns.

[0129] 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 production device adopting chemical reactions. The foam production device comprises a gas generation device, a foaming substance supply device and a gas-liquid mixing device, wherein the gas generation device is used for generating a gas under the action of an external force from a gas source; the foamed substance supply device is used for providing a foaming substance; a mixing cavity for mixing the gas with the foaming substance is formed in the gas-liquid mixing device; a gas inlet, a foaming substance inlet and a foam outlet are formed in the wall surface ofthe mixing cavity. The foam production device has the advantages of being simple in structure, low in manufacturing cost, small in floor space, convenient in on-site arrangement, and the like, and canbe not only applied to fire extinguishing of a common scale, such as building fire hazards and small-size flowing fire on the ground, but also applied to extinguishing of large-size storage tank firehazards or large-scale ground flowing fire hazards. By selecting an appropriate gas source, inert gases such as nitrogen can be generated to join in foaming, the inert gases can be released after thefoams are broken and take a combustion inhibition function into play on surfaces of combusted substances, so as to help to accelerate fire extinguishing.

Description

technical field [0001] The present invention relates to foam generating devices. 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. Gas requirements, and most places do not have high-pressure gas pipeline network. However, if large flow, high pressure, and long-term gas supply are required, multiple compressors or compressed gas cylinders need to be installed (for...

Claims

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Application Information

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IPC IPC(8): A62C5/02
CPCA62C5/02
Inventor 牟小冬郎需庆于辉牟善军姜春明尚祖政吴京峰谈龙妹王林周日峰刘全桢
Owner CHINA PETROLEUM & CHEM CORP
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