A bio-high temperature gasification combined mining method for hydrogen production from coal

Abstract

The invention discloses a bio-high-temperature gasification combined mining method for producing hydrogen from coal, which comprises: drilling two horizontal well groups located on the same horizontal plane in a coal seam, setting casing and cementing the wells; performing hydraulic fracturing on the two wells at the same time to form critical cracks Fracture network: carry out alkali treatment on the coal seam, inject the coal-based hydrogen-producing microbial bacterial liquid into the coal seam in two horizontal wells, the strain spreads along the critical cracks, dynamically monitor the temperature and pressure of the strain to prevent its inactivation, and use the temperature and pressure conditions of the coal seam to promote the microbial stripping of coal Carbon and hydrogen-containing functional groups are captured and metabolized, and the organic components in coal are degraded in multiple stages to produce hydrogen, carbon dioxide and small molecular acids, so as to realize the in-situ separation of carbon and hydrogen in coal and make hydrogen; when the bottom hole pressure reaches the peak value and remains stable, hydrogen will be discharged and recovered ; For the remaining coal seam, hydrogen is produced by gasification of supercritical water and high-temperature carbon, and the gas is extracted and then grouted to fill the burn-out area. The invention subverts the traditional coal mining technology system through the multi-stage utilization of bio-high temperature gasification, and realizes low-carbon, green and efficient development of coal.

Description

technical field [0001] The invention relates to the field of underground coal in-situ hydrogen production, in particular to an underground coal microbial in-situ fermentation hydrogen production technology and a high-temperature gasification hydrogen production combined mining method. Background technique [0002] About 70% of my country's coal resources are stored under the surface kilometer, and with the rapid consumption of coal resources by social development, my country's coal mining depth is increasing at a rate of 8-12 m / a, and the central and eastern mining areas are increasing at a rate of 10-12 m / a. 25 m / a, my country's shallow coal resources are expected to be exhausted within decades. With the increase of mining depth, there are more and more problems faced by deep mining. According to the mining environment characteristics of "five highs and two disturbances" in deep coal resource mining, that is, high ground stress occurrence, high working environment temperatur...

AI Technical Summary

Problems solved by technology

At present, the hydrogen production by dark fermentation is mainly the experiment of hydrogen production by fermentation of organic matter, and researches on influencing factors and medium optimization have been carried out, while the research on hydrogen production by microbial fermentation of coal is less

The fermentation site of the existing coal microbial hydrogen production process is still located on the ground, which produces a large amount of waste water, waste gas, and waste residue, and the environmental protection problem is very prominent. The treatment of "three wastes" greatly increases the process investment, and ground fermentation artificially creates a large amount of transportation cost

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