Deep coal in-situ fluidized mining method based on heat extraction and power generation

Abstract

The invention provides a deep coal in-situ fluidization mining method based on heat extraction and power generation, which comprises the following steps: determining a coal seam needing fluidization mining, and arranging a U-shaped well group in the coal seam; the horizontal well is subjected to secondary transformation, and a fishbone well is built; fracturing a coal seam around the fishbone well; injecting air into the fishbone well; a methane-air mixture in the complex crack is ignited or detonated in an electric shock ignition mode, so that the coal and oxygen decomposed from potassium permanganate are subjected to a combustion reaction; in the coal seam combustion process, water is injected into the horizontal well through the water injection tubular column, and meanwhile oxygen-enriched air is injected through an annular space between the water injection tubular column and the horizontal well; water in the water injection tubular column is heated through a high-temperature environment formed in the coal combustion process, a large amount of water vapor is generated, and then the water vapor is flowback to the ground through the vertical well in the middle. According to the method, a green and environment-friendly fluidized mining process can be provided, the mining efficiency can be effectively improved, and meanwhile, the integrated development and utilization process can be achieved.

Description

technical field [0001] The invention belongs to the technical field of deep coal mining, and in particular relates to an in-situ fluidized mining method for deep coal based on heat extraction and power generation. Background technique [0002] Due to the common problems of frequent safety accidents and the destruction of the ground ecological environment in the mining of deep coal resources, academician Xie Heping proposed in 2016 to use a series of physical, chemical and biological technology methods to reduce the deep coal resources without people going down the well. The concept of fluidized mining technology that can be converted into gaseous or liquid energy. This method subverts the existing concept and system of coal resource mining, enabling coal resources to be developed in a fluidized state like oil and gas mining, thereby solving environmental pollution, ground subsidence, ecological damage, and low development and utilization efficiency in the process of coal min...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems existing in the prior art of deep coal mining, the present invention provides a deep coal in-situ fluidized mining method based on heat extraction and power generation, which can provide A green and environment-friendly fluidized development process, which can not only...

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