Method for converting coal seam gas by adopting novel catalyst

Abstract

The invention discloses a method for converting coal seam gas by adopting a novel catalyst, and belongs to the field of coal seam gas extraction. The method comprises the following specific steps that(1), a series of drill sites are arranged in a to-be-mined coal seam, and the drill holes are arranged in the coal seam through the drill sites; (2) the solution containing the catalyst is injected into the to-be-mined coal seam along the drill holes, gas in the coal seam is directly oxidized into methanol under the catalytic action, and the methanol is dissolved into the solution containing thecatalyst; and (3) the methanol solution containing the catalyst is extracted from the coal seam, the catalyst is separated from the methanol solution through an underground separation system, the separated catalyst is injected into the coal body again to realize cyclic utilization of the catalyst solution, and the methanol solution is stored into a methanol storage tank after purifying. Accordingto the method, gas in a free state can be extracted, and gas attached to the coal body can also be extracted, the gas extraction efficiency is greatly improved, and meanwhile the gas is converted anddissolved, so that the gas extraction safety is greatly improved.

Description

technical field [0001] The invention relates to the field of coal mine gas drainage, in particular to a method for converting coal seam gas using a novel catalyst. Background technique [0002] Gas, also known as "coal bed methane", is one of the main disasters of coal mine safety production. In recent years, with the continuous increase of mining intensity and mining depth in my country's coal mines, affected by high ground stress, high gas pressure and high gas content, coal mine gas Disasters have gradually become the main content of mine disasters. At the same time, gas is an energy substance. Due to factors such as difficult collection and high storage risk, the utilization rate of gas is extremely low, resulting in a large waste of energy substances. As an important means of preventing gas accidents, gas drainage can not only greatly reduce the gas content of coal seams, but also collect and utilize the resource of gas. [0003] At present, the commonly used methods of...

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Problems solved by technology

[0003] At present, the commonly used methods of gas extraction in my country are: hydraulic fracturing, deep hole pre-splitting blasting and gas drainage drilling. Among them, hydraulic fracturing is due to the injection of a large amount of water into the coal body, resulting in too much humidity in the working face, which affects Production efficiency; deep hole pre-splitting blasting requires the use of explosives, which are prone to open flames and cause gas disasters; the gas drainage hole extracts gas through the pressure difference between the inside and outside of the coal body, and the extraction efficiency of gas in the free state is higher, while for the gas attached to the coal body gas, the extraction effect is greatly reduced

[0004] To sum up, the existing gas drainage methods cannot effectively solve the problems of safe and efficient gas drainage, and at the same time have an impact on the subsequent coal mining environment.

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