Extracting and converting method for heat energy in coal field fire zone

Abstract

An extracting and converting method for heat energy in a coal field fire zone belongs to heat energy extracting and converting methods. A flame retardant filling material is utilized to cover air inlet and air outlet channels in a high temperature zone, such as earth surface cracks and collapse pits, injecting and pumping drill holes for a heat extracting medium are constructed from the earth surface to an underground coal fire high-temperature zone, and the injecting drill holes are distributed on the circumference with the pumping drill hole as a center. A gaseous heat medium is pressed into the injecting drill holes by a gas booster pump, then, a vacuum pump pumps out heat medium mixed gas finishing heat exchange and guides the heat medium mixed gas into a filter, the filtered gas enters an evaporator so as to finish heat exchange, and exchanged heat energy is converted to electricity by an organic Rankine cycle system. Then, other gasses are separated out of the heat medium mixed gas by a gas component separating station, and the rest heat medium is input into a low-temperature gas storage tank after being cooled by a cooler. Finally, the heat medium is pressed into the injecting drill holes again by the gas booster pump, and cycle is finished. The method has the advantages that not only are the extracting and conversion of waste heat energy in the coal field fire zone realized, and the purpose of fire zone treatment is also achieved, and has wide practicability.

Description

technical field [0001] The invention relates to a method for extracting and transforming heat energy, in particular to a method for extracting and transforming heat energy in coalfield fire areas. Background technique [0002] Coalfield fire refers to the phenomenon of large-scale coal combustion that gradually develops along the coal seam after the underground coal seam ignites due to natural or human factors, causing great harm to coal resources and the surrounding environment. All coal-producing countries in the world have underground coal seam combustion to varying degrees. The phenomenon. About 1 billion tons of coal are burned by underground coal fires in the world every year, accounting for about 12.5% ​​of the total coal consumption, generating about 1000GW of energy, which is equivalent to 2.5 times the sum of the energy produced by the world's 500 nuclear power plants, exceeding the output of hydropower The energy is nearly 100GW. The combustion of a large amount...

AI Technical Summary

Problems solved by technology

The combustion of a large amount of coal resources in coalfield fire areas produces huge heat energy. The current control methods for coalfield fire areas mainly include stripping, water injection and grouting methods. These methods treat the heat energy of fire areas as a source of disaster. All heat energy is lost and cannot be extracted and utilized, resulting in huge energy loss

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