Liquid nitrogen system and method for nondestructively governing fire area in coal field

Abstract

The invention discloses a liquid nitrogen system and a method for nondestructively governing a fire area in a coal field. An air filter (1), an air compressor (2), an air cooler (3), an oil-water separator (4), an air drying purifier (5), an air separation tower (6), a liquid nitrogen storage slot (7) and a booster pump (8) are sequentially connected by a pipeline; a liquid nitrogen tank car (9) and an access end of a surface borehole (10) are connected with an output end of the booster pump (8); a bottom surface borehole (10) and a geothermal well (12) are positioned in the fire area in the coal field; and geothermal power generation equipment (11) generates power to supply to the equipment by virtue of high-temperature steam provided by a geothermal well (12). According to the liquid nitrogen system and the method disclosed by the invention, waste heat energy generated by the fire area in the coal field is utilized to carry out geothermal power generation, so that energy waste is reduced; a liquid nitrogen fire preventing and extinguishing technology is adopted to govern coal field fire, so that cooling and inerting are quickly carried out on the fire area; the liquid nitrogen is from nitrogen gas in air, and quickly returned into air for being recycled for preparing liquid nitrogen, so that not only is environmental destruction not caused, but also cycling and reutilization of resources are realized.

Description

technical field [0001] The invention relates to a liquid nitrogen system and method for nondestructively treating coalfield fire areas, belonging to the field of coal mine security. Background technique [0002] Coal is the main energy source in our country, and energy security is related to the lifeline of national stability and development. However, China is the country most threatened by coal field fires. The American media listed China's land fires as one of the "top 5 persistent disasters in the world". Spontaneous coal fires burn 20% of the total energy consumption of the United States every year. . The underground coal fire in Inner Mongolia in the 1960s still plagues my country. This coal fire consumes about 20 million tons of coal resources every year, which exceeds the annual coal output of Germany. Moreover, coalfield fires will threaten mining safety, waste a large amount of thermal energy resources, and seriously damage the ecological environment. [0003] Th...

AI Technical Summary

Problems solved by technology

However, because it is impossible to accurately locate the high temperature point in the fire area, and the diffusion range of the slurry is limited, the water / slurry effect is not good; the gel and foam have certain fluidity, and the effect on the spontaneous combustion of coal in the goaf is better, but the cost is higher , once the bubble bursts, the fire protection effect will be greatly reduced

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