Underground coal gasifier with air-lift point separating control and its process

Abstract

An underground coal gasifier with separated control of gas injection point and its process method, the method is realized in the underground coal gasifier with separated control of gas injection point, the gasifier is provided with air supply holes (2) and air supply Lane (12), air outlet (4) and gas passage (6), lay with oxygen supply pipe (3) in air supply hole (2) and air supply lane (12), connect several on the oxygen supply pipe (3) A gas injection point separated by a certain distance controls the four-way pipe (8); the temperature sensor (13) is arranged at the four-way pipe (8); the flap A (25) and the flap B on the corresponding four-way pipe (8) (20) position is provided with blind hole (11) in the coal seam of both sides along air supply lane (12). The invention overcomes the phenomenon that the gasification of oxygen-enriched water vapor will cause the coal walls around the tunnel at the bottom of the borehole to burn, avoids the caving and blocking of the tunnel at the bottom of the borehole in the air supply tunnel, ensures the gas output and quality; prevents the air supply tunnel from directly Oxygen supply ensures the safety of the gasification system; at the same time, the controllability and stability of the gasification process are increased through the control of the gas injection point and the corresponding loose blind holes.

Description

technical field [0001] The invention belongs to the technical field of underground coal gasification, and in particular relates to an underground coal gasification furnace with separate control of gas injection points and a process method thereof, which is suitable for producing chemical synthesis gas and medium calorific value coal gas by oxygen-rich underground coal gasification. Background technique [0002] At present, air is used as the gasification agent in underground coal gasification production. Air gas has low calorific value and limited use. Using oxygen-enriched water vapor as gasification agent can significantly improve the gas composition, calorific value and the stability of the production process. . However, for the well-type "long channel, large cross-section" underground coal gasifier, the gasification of oxygen-enriched water vapor will cause coal wall combustion around the tunnel at the bottom of the borehole, causing the tunnel at the bottom of the boreh...

AI Technical Summary

Problems solved by technology

However, for the well-type "long channel, large cross-section" underground coal gasifier, the gasification of oxygen-enriched water vapor will cause coal wall combustion around the tunnel at the bottom of the borehole, causing the tunnel at the bottom of the borehole to collapse. In addition, if the air supply lane is used to directly supply oxygen, the pyrolysis gas generated by the coal seam due to heating will enter the air supply lane and mix with oxygen and explode, endangering the safety of the gasification system. Oxygen plus water vapor underground gasification currently has no field test and production examples in my country, that is, no feasible process and gasifier structure have been formed.

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