Design method of isolated coal pillar and gasifier width in underground gasification under overlying rock aquifer
A technology for underground gasification and design methods, applied in design optimization/simulation, instrumentation, geometric CAD, etc.
Active Publication Date: 2021-07-06
CHINA UNIV OF MINING & TECH
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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 gasification of the strip mining-face mining retreating controlled injection underground gasification under the overlying rock aquifer.
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[0027] The present invention will be described in further detail below in conjunction with figure and specific implementation process:
[0028] As shown in Figure 1, the method for designing the width of the isolated coal pillar and the width of the gasifier for underground gasification under the overburden aquifer is as follows:
[0029] a. Determine the maximum height of the waterproof coal rock pillar according to the hydrogeological data of the gasification area and the location of the aquifer;
[0030] b Use the calculated thickness of the protective layer to determine the limit value of the development of water-conducting fractured zones in gasification coal mining in the study area;
[0031] cUsing the collected geological data of the gasification area and the mechanical parameters of each rock formation, a numerical simulation model is established based on the numerical simulation method for underground gasification under the control of gas injection by strip mining an...
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A method for designing the width of isolated coal pillars and gasifiers in underground gasification under overburden aquifers, which is suitable for the design of underground gasification coal mining under overburden aquifers. First, determine the maximum height of the waterproof coal rock pillar according to the position of the aquifer; calculate the thickness of the protective layer in the gasification area, and determine the development limit of the water-conducting fracture zone in the gasification area; Numerical model to determine the relationship between the development height of the water-conducting fractured zone and the width of the gasifier and the isolated coal pillar in underground gasification under the control of strip mining-surface mining retreat; combined with the development height of the water-conducting fracture zone and the width of the gasifier and the isolated coal pillar Select the gasifier and the width of the isolated coal pillar for strip-mining-surface-mining retreat-controlled gas injection underground gasification, and then complete the safe production of strip-face-mining retreat-controlled gas injection underground gasification under the overlying rock aquifer design. The steps are simple, and the best gasification production benefits can be guaranteed under the premise of ensuring the stability of the overlying aquifer and the safe production of underground gasification.
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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IPC IPC(8): G06F30/20G06F30/17G06F119/14
CPCG06F30/17G06F2119/14G06F30/20
Inventor 李怀展郭广礼查剑锋徐友友刘潇鹏
Owner CHINA UNIV OF MINING & TECH