Overlying strata aquifer-oriented isolation coal pillar and gasification furnace width design method for underground gasification

Abstract

The invention discloses an overlying strata aquifer-oriented isolation coal pillar and gasification furnace width design method for underground gasification. The method is suitable for underground gasification coal mining design under an overlying strata aquifer. The method includes the following steps that: the maximum height of a waterproof coal-rock pillar is determined according to the position of the aquifer; the thickness of the protective layer of a to-be-gasified area is calculated, and the limit value of the water flowing fractured zone development of the to-be-gasified area is determined; a strip-surface mining retreating type control gas injection underground gasification numerical model is established, and a relationship between strip-surface mining retreating type control gasinjection underground gasification water flowing fractured zone development height and gasification furnace and isolation coal pillar width is determined; and on the basis of the relationship betweenthe water flowing fractured zone development height and the gasification furnace and isolation coal pillar width, the gasification furnace and isolation coal pillar width for strip-surface mining retreating type control gas injection underground gasification is selected; and therefore, safety production design for the strip-surface mining retreating type control gas injection underground gasification of the overlying strata aquifer is completed. The steps of the method are simple. Optimal gasification production benefits can be guaranteed on the premise that the stability of the overlying aquifer and underground gasification safety production are guaranteed.

Description

technical field [0001] The invention designs a method for designing the width of isolated coal pillars and gasifiers in underground gasification, and is especially suitable for isolating coal pillars and gasification in underground gasification under overlying rock aquifers for safe gasification coal mining under aquifers. Furnace width design method. [0002] technical background [0003] The development of underground coal gasification is not only the need for environmental protection, but also one of the important technical directions for the future development of the coal industry. It is also of great significance for improving my country's energy security. The essence of underground coal gasification is not to extract coal, but to extract the energy contained in coal. In 1868, based on this concept, the German scientist Sir William first proposed the idea of ​​underground coal gasification in situ. Since then, the Soviet Union, the United States, Australia and other co...

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Problems solved by technology

However, there is no relevant research on how to design the width of the gasifier and the isolated coal pillar in the underground ga

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