Method, device and system for determining internal combustion mined-out areas of underground coal gasification furnace

Abstract

The invention discloses a method, a device and a system for determining internal combustion mined-out areas of an underground coal gasification furnace. The method includes acquiring a preset temperature equivalent line of the underground coal gasification furnace at a current moment according to acquired real-time concentration of earth-surface radioactive substances above the underground coal gasification furnace; acquiring a quantity of preset gas outputted by the underground coal gasification furnace; determining the internal combustion mined-out areas in preset states in the underground coal gasification furnace at the current moment according to the acquired preset temperature equivalent line and the acquired quantity of the preset gas. The quantity of the preset gas refers to the quantity of the preset gas outputted by the underground coal gasification furnace in a period from an initial moment to the current moment, the initial moment is a moment when the requirement of a preset temperature is met, and the preset gas is gas generated by the internal combustion mined-out areas in the preset states in the underground coal gasification furnace. The method, the device and the system have the advantage that the ranges and propagation rules of the internal combustion mined-out areas of the underground coal gasification furnace can be monitored in real time.

Description

technical field [0001] The invention relates to an underground coal gasification technology, in particular to a method, device and system for determining the internal combustion void area of ​​an underground coal gasification furnace. Background technique [0002] Underground coal gasification is the process of converting underground coal into combustible gas in situ through thermochemical reactions. [0003] Before gasification, at least two boreholes need to be drilled down from the ground into the coal seam. Among them, one borehole (hereinafter referred to as the air intake hole) is used to output gasification agents such as air, water vapor, oxygen-enriched air, etc. to the coal seam to gasify the coal seam; The combustible gas is transported to the ground (hereinafter referred to as the vent hole). [0004] Because the natural permeability of the coal seam is very poor, before the gasification agent is input into the coal seam through the air inlet hole, it is necess...

AI Technical Summary

Problems solved by technology

In addition, the increasing exposure of the roof and floor of the coal seam may cause excessive movement, cracking, damage and surface subsidence of the coal strata above the burn-out area, resulting in gas leakage in the burn-out area or overflowing the surface to pollute the environment, making the gasifier unable to operate normally

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