Water control system and water control method for underground coal gasifier

Abstract

The invention provides a water control system and water control method for an underground coal gasifier. The water control system for an underground coal gasifier includes a plurality of interconnected drainage channels and at least one vertical drainage well. The drainage wells are connected, and the drainage channel is arranged around and at the bottom of the underground coal gasifier. The underground coal gasifier has a gasification channel, and the drainage channel communicates with the gasification channel of the underground coal gasifier through cracks in the coal seam. The water control method is to introduce the water in the gasification channel into the drainage channel through the cracks in the coal seam. The water control system and method for the underground coal gasification furnace of the present invention can effectively control the water volume of the gasified coal seam, which is helpful for the gasification reaction and prevents gas water Mutual string, and drainage channel blockage.

Description

technical field [0001] The invention relates to the field of underground coal gasification, and more specifically, relates to a water control system and a water control method for an underground coal gasification furnace. Background technique [0002] Underground coal gasification is the process of gasification through boreholes in the original coal seam. In the process of coalbed gasification, if the water content of the coal seam is small, the gasification reaction can be enhanced, but it will increase the difficulty of coal seam ignition. If the water content of the coal seam is high, the resistance of the gasifier will increase. Therefore, water control is the key to the coal bed gasification process. the key link. [0003] At present, there are mainly two types of drilling holes for underground coal gasifiers: vertical holes and directional holes. When the drilling holes are constructed in the water-bearing coal seam, the original coal seam is destroyed, and the part o...

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Problems solved by technology

[0005] However, in the above-mentioned drainage system, since the gasification channel and the drainage channel of the underground coal gasifier are interconnected by vertical holes, the combustion products such as ash and tar during the gasification process can enter the drainage channel along this channel and block the drainage channel; The gas in the gasification furnace may also enter the drainage channel, resulting in a decrease in the efficiency of the water pump or no water, or even causing cavitation to damage the water pump; and when the water in the drainage channel is too large, it may also cause water to enter the gasification channel and form a water seal , not conducive to gasification

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