Underground interlayer type coal in-situ gasification mining system and construction method thereof

Abstract

The invention belongs to the technical field of underground coal gasification, and particularly relates to an underground interlayer type coal in-situ gasification mining system and a construction method thereof. According to the gasification mining system and construction method thereof, a pre-control system is used for injecting a flame retardant to moisten coal, and the structure of a gasification system is controlled in advance; a heating vertical shaft is drilled into a coal seam lower base plate rock stratum, combustion equipment is arranged to heat the lower base plate rock stratum, coal is combusted to generate coal gas through the thermal conductivity of the lower base plate rock stratum, and then a gas collecting system collects the coal gas and conveys the coal gas to the ground; in the coal bed gasification process, the coal bed temperature and the lower base plate rock stratum stress are monitored; heating equipment is arranged in the coal seam lower base plate rock stratum, and disturbance to the coal seam is reduced; and the high-temperature-resistant coal wall is reserved by utilizing a pre-control system, so that the air tightness of a gasification cavity is improved, the coal seam is heated more uniformly and controllably, an ideal temperature field is provided for sufficient combustion of the coal seam, and the quality of produced coal gas is improved.

Description

technical field [0001] The invention belongs to the technical field of underground coal gasification, and in particular relates to an underground interlayer type coal in-situ gasification mining system and a construction method thereof. Background technique [0002] The traditional underground coal gasification technology is a process of controlled combustion of underground coal to generate combustible gas through thermal and chemical effects on coal. It integrates the three major processes of well construction, coal mining and gasification, changes traditional physical coal mining into chemical coal mining, and changes traditional mechanized coal mining into unmanned gas extraction. It has the advantages of short mining flow, low cost, and low pollution The advantages of low emission and high resource recovery rate can improve the utilization value of coal, promote the mining of difficult-to-mining coal seams and low-grade coal seams, and drive the development of traditiona...

AI Technical Summary

Problems solved by technology

[0007]The temperature, pressure and shape of the gasification chamber lack effective monitoring methods, resulting in unclear understanding of the evolution law of the gasification chamber and the main control factors, and the principle of gasification control is still unclear. Unclear, the gasification operation control process cannot guarantee the stable production and gasification efficiency of medium calorific value coal gas, which greatly restricts the gas application of UCG coal gas and the product development of chemical raw material gas

[0008] In summary, UCG technology still has defects such as large energy consumption, uneven heating of coal seams, and poor air-tightness. Stable and controllable progress hinders the green and efficient mining of coal and the large-scale industrial application of UCG technology

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