Gas injection pipeline movable sealing system and method for underground coal gasification

Abstract

The invention provides a gas injection pipeline movable sealing system and method for underground coal gasification, relates to the technical field of coal gasification and exploitation, and solves the problem of combustible gas leakage between a gas injection pipe and a protection pipe. The system comprises annular air bags, a pressure sensor, a hydraulic supporting part, a controller, an air compressor, a vacuum pump, a temperature-resistant cement layer and a high-strength temperature-resistant layer, wherein the plurality of annular air bags are arranged at intervals along the gas injection pipe, the pressure sensor monitors the air pressure in the annular air bags, and the hydraulic supporting part supports and fixes the gas injection pipe; and an auxiliary wire outlet is arranged between the protection pipe and the gas injection pipe, and the controller receives signals of the pressure sensor and controls the air compressor and the vacuum pump to work. The system is installed ina gas injection drilling channel, the air pressure of the annular air bags is controlled in real time through the controller, and the sealing state between the gas injection pipe and the protection pipe is guaranteed; and the method ensures the operation safety in a bottom plate rock roadway, reduces the coal gasification loss rate and prolongs the service life of the system.

Description

technical field [0001] The invention relates to the technical field of coal gasification mining, in particular to a gas injection pipeline moving sealing system and method for underground coal gasification. Background technique [0002] Underground coal gasification (Underground Coal Gasification, referred to as UCG) is the process of directly burning underground coal in a controlled manner, and generating combustible gas through thermal and chemical effects on coal. Underground coal gasification is generally through the injection of gasification agents to promote coal gasification reactions such as pyrolysis, reduction, and oxidation to produce combustible gases such as hydrogen, carbon monoxide, and methane. Underground coal gasification has the advantages of high efficiency, safety, environmental protection, and high economic benefits. . In addition, underground coal gasification technology can also be used for thin coal seams, deep coal seams, three-down coal seams, and...

AI Technical Summary

Problems solved by technology

[0010] In order to solve the problem of combustible gas leakage between the gas injection pipe and the protective pipe during underground coal gasification, ensure the safety of operation in the floor rock roadway, reduce the loss rate of coal gasification, and prolong the service life of the system, the present invention provides a coal Gas injection pipeline mobile sealing system and method for underground gasification, the specific technical scheme is as follows

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