Underground coal gasification

Abstract

A coal gasification process of coal bed deep underneath includes a gasification furnace in the coal bed, a gas let in canal linking one end of the furnace to ground, a gas let out canal linking the other end of the furnace to ground. Gas generated by coal burning in the furnace is collected. A drain system links a drain outlet over 10 meters below the furnace to the ground.

Description

technical field [0001] The invention relates to a deep underground coal gasification process, in particular to a well-free coal gasification process with a coal seam below about 1000 meters underground and with a better drainage scheme. Background technique [0002] Underground coal gasification is a multidisciplinary development of clean energy and chemical industry through the controlled combustion of underground coal and the generation of combustible gas through thermal and chemical effects on coal. It integrates well construction, coal mining, and gasification processes. The essence of the new technology of raw materials is to extract the energy-containing components in coal and change physical coal mining into chemical coal mining, which has the characteristics of good safety, low investment, high efficiency, and less pollution. It is known as the second generation of coal mining. method. [0003] see figure 1 , the underground coal gasification technology is to dig a...

AI Technical Summary

Problems solved by technology

However, at present, there is no better drainage solution for the deep wellless gasifier, but simply use high-pressure air to directly press all the accumulated water in the furnace into the coal body around the furnace wall

This method not only consumes energy but also has poor drainage effect

[0013] In addition, in the process of gasification mining of deep underground coal seams, due to factors such as extremely high ground stress, extremely high deep groundwater pressure, frequent gas outburst accidents, and complex geological structures, the deep underground gasification The furnace has problems such as continuous infiltration of groundwater into the gasifier, deformation and instability of the gasifier under high ground pressure in the deep part, resulting in blocked air flow channels, etc.

[0014] At present, my country's energy crisis is becoming more and more prominent. If it cannot be effectively resolved, it will bring many obstacles to the development of my country's economy; and my country's kilometer-deep coal resources, the estimated reserves are more than trillions of tons, and there is indeed room for development. Necessary, in order to solve the above-mentioned problems existing in the deep well-free underground coal gasification process, the present invention proposes a new deep underground coal gasification process below 1,000 meters

Images