Temperature-controlled explosion method for gasified deep part coal body of coal mine underground coal bed

Abstract

The invention discloses a gasification method of underground coal seam which mainly comprises that a coal seam is duly and fully burnt during the underground coal seam gasification. The deep coal can not be burnt thoroughly or continuously as burnt wastes existing in the process of deep coal burning prevents the ventilation. The implementing method includes that firstly, holes are drilled in the coal seam at intervals along the coal seam strike, and then the bottom of the borehole is equipped with a temperature-controlled explosive. The concrete method is as follows: holes are drilled in the coal seam at intervals along the coal seam strike; then the bottom of the borehole is equipped with a temperature-controlled explosive; the production method of the temperature-controlled explosive is that the produced explosive can only be exploded at a temperature that is higher than a certain temperature, or the explosive is wrapped up with a shell externally, the shell can only be exploded at the temperature that is higher a certain temperature; during the burning of the coal seam, the heat released by burning increases the temperature of the coal seam near the borehole; the explosive explodes when the temperature of the coal seam near the borehole reaches to an explosive temperature; a loosening surface is excavated in the coal seam, so that the air can ventilate in loosening coal body, the burning is sufficient, thus ensuring the gasification effect, avoiding the insufficient burning of the coal seam, and ensuring the gasification stability.

Description

technical field [0001] The invention relates to an underground coal seam gasification method in coal mines, in particular to a method for promoting full combustion of deep coal bodies in the working face of an underground coal seam gasification furnace. Background technique [0002] With the increase of coal mining depth, the occurrence conditions of coal seams have become more and more complex, and a large number of coal pillars are left underground: for example, in a coal mining face, there are often several faults with different sizes, leaving a large number of faults. Coal pillars: Limited to mining technology, it is difficult to recycle a large number of thin coal seams, protective coal pillars, high ash and high sulfur coal seams, etc. Recovery of coal pillars and recovery of coal seam reserves that are not economically unrecoverable would be a good mining method using underground coalbed gasification technology. In the process of underground coal gasification, due to...

AI Technical Summary

Problems solved by technology

In the process of underground coal gasification, due to the poor gas permeability of coal seams, the gasification reaction area is small, and the gasification gas production is low, which restricts the development of this technology.

Images