Stability evaluation of underground gasification site foundation and preliminary investigation on supercritical CO2 storage in combustion space
In order to facilitate the efficient reutilization of underground combustion space area,and based on the characteristics of underground coal gasification process and combustion space area,this pa-per established the stability evaluation model of gasified isolated coal pillars,the calculation model of overburden fracture development height and the prediction model of surface residual subsidence.Further-more,the stability evaluation method of combustion space area was proposed,it thus provided technical support for the reutilization of combustion space area.The problem of combustion space treatment was also addressed by coupling supercritical CO2 storage with underground coal gasification based on the bot-tlenecked geological storage of CO2.The impacts of gasifier parameters on the fracture development law of cap rock was analyzed after supercritical CO2storage in combustion space,and the stability evaluation method of isolated coal pillar during the storage process was established.It provided scientific basis for the coupled production design of underground coal gasification and CO2 storage.Finally,the main issues of underground coal gasification coupled with CO2 storage were proposed,and the urgent implementation of related research work was stressed.There is some theoretical as well as practical significance to the re-sults of this study with regard to the reutilization of the combustion space area and related sites.
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