Novel liquid nitrogen and liquid carbon dioxide fire preventing and extinguishing system and method

Abstract

The invention relates to a novel liquid nitrogen and liquid carbon dioxide fire preventing and extinguishing system and method, and belongs to the technical field of fire preventing and extinguishing. According to the technical scheme, the bottom of a liquid nitrogen low-temperature storage tank (1) is communicated with a liquid nitrogen storage tank liquid outlet pipe opening (2) and then divided into two paths, one path is connected with a gas phase space at the top of the liquid nitrogen low-temperature storage tank (1) through a storage tank self-pressurization device so that the pressure of the liquid nitrogen low-temperature storage tank (1) can be increased, the other path is connected to a pressurization device (5) through a low-pressure liquid nitrogen pipeline (4), and the pressurization device (5) is connected with a gasification device (8). The gasification device (8) is connected with an electric heating auxiliary heating device (12), the electric heating auxiliary heating device (12) is connected with a pressure and flow stabilizing device (15), and the pressure and flow stabilizing device (15) is connected with a user header pipe (21). The novel liquid nitrogen and liquid carbon dioxide fire preventing and extinguishing system has the positive effects that the gas flow and pressure requirements under the influence of a plurality of factors such as users and environments can be met, and the stable supply of gas can be ensured.

Description

technical field [0001] The invention relates to a novel liquid nitrogen and liquid carbon dioxide fire prevention system and method, belonging to the field of fire prevention technology. Background technique [0002] Mine fires pose a great threat to the safe production of coal mines. In my country's key state-owned coal mines, mines with the risk of spontaneous combustion account for about 50%, and fires caused by spontaneous combustion account for more than 90% of the total number of fires. Conventional fire prevention technologies such as mud-sand grouting, gel, inhibitor, foam, etc. have the disadvantages of consuming a large amount of sand or water, poor permeability and diffusivity, limited coverage area, deteriorating underground working environment, affecting coal quality, and corroding underground equipment. At present, the use of liquid nitrogen gasification for fire prevention and extinguishing has been gradually applied to major coal mines. Nitrogen fire extingui...

AI Technical Summary

Problems solved by technology

However, the existing liquid nitrogen fire prevention system technology for coal mines generally has insufficient gas source pressure and flow rate, poor pressure and flow stability, poor system stability, excessive pressure drop during transportation, and insufficient heat required for gasification. The medium is single, resulting in increased fire extinguishing time, cooling down and fire extinguishing effect are significantly reduced, etc.

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