Multi-channel gasifier for underground coal gasification and gasification method

Abstract

The invention discloses a multi-channel gasifier for underground coal gasification and a gasification method. The multi-channel gasifier comprises a ground gasification part and an underground gasification part, wherein the ground gasification part comprises an equipment base, a coal gas collecting furnace, a gas outlet pipe, a wastewater purification tank, a gas inlet system and a coal gas purification and hydrogen purification system; the underground gasification part comprises an outer protection pipe, an inner ventilation pipe and a gas injection device; the coal gas collecting furnace is fixedly mounted on the equipment base; the wastewater purification tank is used for filtering and recycling sewage; the gas inlet system is mounted in the wastewater purification tank and stretches into a coal layer from a gas inlet hole through the gas inlet system, so that conditions are provided for coal gas gasification; purified coal gas in the coal gas collecting furnace enters the coal gas purification and hydrogen purification system to be subjected to separation and compression of the coal gas and the work of reacting the coal gas to generate hydrogen; one end of the outer protection pipe is communicated with the gas inlet system; and after the coal gas enters the coal layer, the outer protection pipe is opened and the gas injection device rotates out to inject water mist and air, so that the coal layer reacts and the rapid generation of the coal gas is facilitated.

Description

technical field [0001] The invention relates to the technical field of coal utilization equipment, in particular to a multi-channel gasification furnace and a gasification method for underground coal gasification. Background technique [0002] Underground coal gasification is an energy conversion technology that efficiently and cleanly utilizes low-quality coal resources. It is a process in which underground coal is directly burned in a controlled manner, and combustible gases are generated through thermal and chemical effects on coal. Due to the difference in hydrogeological conditions of different coal seams, the effect of underground coal gasification technology after implementation is different. Especially in coal seams rich in water, because the coal seam gasification process is a chemical process of self-expansion in volume, a large amount of heat is released during the coal seam combustion process, and the heat released makes a large amount of water in the coal seam v...

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Problems solved by technology

[0004] Based on this, it is necessary to provide a multi-channel gasifier and gasification method for underground coal gasification with higher efficiency, which can recycle water and purify hydrogen in order to solve the problem of low coal gas generation efficiency.

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