Clean energy taking system and method for coal-bed gas field

Abstract

The invention discloses a clean energy taking system and method for a coal-bed gas field. Two coal-bed gas wells entering a recession period and one coal-bed gas well still in a production stage are selected in the coal-bed gas field, the two coal-bed gas wells entering the recession period are the first coal-bed gas well and the second coal-bed gas well correspondingly, the coal-bed gas well still in the production stage is a third coal-bed gas well, wherein the depths of the first coal-bed gas well, the second coal-bed gas well and the third coal-bed gas well are sequentially increased, anda first pressure swing adsorption separation device, a gas injection pump, a supercritical water gasification hydrogen production device, a gas-solid-liquid separation device, a heat exchange device and a gas separation and purification liquefaction device are involved. According to the clean energy taking system and method, secondary development and utilization of the coal-bed gas field in the recession period are effectively implemented, various devices such as gasifier building, combustion control and monitoring are omitted, the underground coal gasification cost is greatly reduced, low-carbon emission is achieved, and a new high-added-value product is obtained.

Description

technical field [0001] The invention belongs to the technical field of comprehensive development and utilization of coalbed methane and underground coal gasification, and in particular relates to a clean energy harvesting system and method for a coalbed methane field. Background technique [0002] Coal is the fossil energy with the largest amount of reserves and the largest amount of mining in my country. The mining history has reached hundreds of years. Especially since the reform and opening up, the high-intensity mining has basically completed the mining of shallow coal seams, while the mining of middle and deep coal seams is difficult and costly. High-efficiency and low-cost development of rich mid-to-deep coal resources has become a research direction. After decades of exploration and practice, underground coal gasification has become the most important means of in-situ mining. Underground coal gasification involves drilling vertical / horizontal wells, constructing under...

AI Technical Summary

Problems solved by technology

Underground coal gasification technology is an important technical direction for the efficient development of mid-deep coal resources. It has major defects such as high cost of new drilling and underground gasification furnace construction, low comprehensive thermal efficiency, insufficient deep processing and utilization of crude gas, and high carbon emissions.

Although there are documents and patents on the basis of underground coal gasification technology to innovate and propose a hydrogen production process, the underground gasification process still has important defects such as low efficiency, difficult control, and low comprehensive thermal efficiency.

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