Stripe type coal underground gasification system and production method

Abstract

The invention relates to the technical field of coal mining, and discloses a stripe type coal underground gasification system and production method. The end of the directional gas injection channel isdrilled and penetrated to form an injection and exhaust passage through the construction of narrow strip gasifier; by entering a ignition pipe to the breakthrough point of the injection and exhaust channel in the gas injection line of the gasifier, the ignition pipe is input to high calorific value combustible gas and oxygen, and coal seam ignition in the gasifier is carried out; the gas injection control is carried out through an equal distance arrangement of the hot melt elastic connector on the air injection line in the gas injection channel, so that gas injection points can rollback at intervals with a directional movement of a flame working face; and variation of temperature value can be monitored by setting temperature monitoring drill. The mine coal seam floor rock tunnel is used for carrying out the construction of furnace building construction and the operation of the gasifier, not only is the interference and damage to the coal seam in the gasification area reduced and the airtight in the gasifier is ensured, but also cost of the furnace building furnace is reduced, and the efficiency of the gasifier furnace building is improved.

Description

technical field [0001] The invention belongs to the technical field of coal mining, in particular to a strip type underground coal gasification system and a production method. Background technique [0002] Underground coal gasification technology (Underground Coal Gasification, UCG) is also called in-situ coal gasification. Separation, fixed carbon, etc.) are transformed into combustible gases through physical and chemical transformations such as pyrolysis, combustion, and gasification. UCG combines the three major processes of well construction, coal mining and gasification into one, and has the advantages of low gas production cost, high safety and good environmental benefits. The cost of coal gas produced by UCG is only 25-50% of the gasification of the ground gasifier. It can be used as raw material gas for gas-fired power generation, boiler fuel and synthetic chemical products, significantly reducing the cost of power generation or synthetic chemical products. UCG als...

AI Technical Summary

Problems solved by technology

If there is no gas injection pipeline in the gas injection channel, the gasification agent will be transported from the open hole (or roadway) in the coal seam, causing the combustion interface of the flame working surface to flow upwards against the gas injection, expanding the combustion range to the gas injection channel, not only Enlarging the combustion range and boundaries in the gasifier will also cause turbulence in the gasification furnace, and the mixed combustion of gasification agent and gas will reduce the quality of the gas; if there is no mobile gas injection device in the gas injection channel or the distance between the gas injection ports When the value is large, the injection point of the gasification agent cannot move with the directional movement of the flame working surface, and the distance from the gasification agent to the flame working surface diffused from the burnout area increases, which leads to the turbulence of the air flow in the gasifier, and also causes lead to lower gas quality

[0013] The existing technology has poor control over the stability of the surrounding rock of the gasifier. The size design of the gasifier cannot meet the requirements of the stability control of the surrounding rock. The designed mining width of the gasifier is larger than the limit span of the overlying rock. Large-scale collapse of overlying rock, excessive development of fissure zones, communication with aquifers, gas leakage in the furnace, drop in gas pressure, excessive influx of groundwater, and even flooding of the gasifier, resulting in major operational accidents

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