Foam production method using liquid nitrogen and application of foam production method and firefighting method

Abstract

The invention discloses a foam production method using liquid nitrogen and the application of the foam production method and a firefighting method. The foam production method comprises the following step: mixing liquid nitrogen with a foaming substance, so as to enable the foaming substance to produce foams. According to the foam production method disclosed by the invention, a mode that a gas generated from liquid nitrogen in situ is mixed with a foaming substance is adopted for a first time, because of a relatively large ratio of the volume of the gas generated from the liquid nitrogen to thevolume of the liquid nitrogen, the volume of a container for storing the liquid nitrogen can be greatly reduced, and a large-size air compressor or an air compressor set can be replaced by small-sizestorage equipment. In addition, due to the adoption of the liquid nitrogen joining in foaming, nitrogen can be released after the foams are broken and takes a combustion inhibition function into playon surfaces of combusted substances, so as to 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. 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, multipl...

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

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