地下气化场地地基稳定性评价及燃空区封存超临界二氧化碳初探

Stability evaluation of underground gasification site foundation and preliminary investigation on supercritical CO_(2)storage in combustion space

为促进燃空区及其场地高效再利用,结合煤炭地下气化工艺特点及燃空区特征建立了气化隔离煤柱稳定性评价模型、覆岩裂隙发育高度计算模型及地表残余变形预测模型,进而提出了燃空区场地稳定性评价方法,为燃空区场地的再利用提供了技术支撑。同时,针对燃空区治理难题,结合CO_(2)地质封存面临的瓶颈提出了煤炭地下气化耦合超临界CO_(2)封存的思路,分析了气化炉参数对燃空区封存超临界CO_(2)后盖层裂隙发育规律的影响,并建立了燃空区封存超临界CO_(2)过程中隔离煤柱稳定性评价方法,为面向煤炭地下气化耦合CO_(2)封存的生产设计提供了科学依据。最后,提出了煤炭地下气化耦合CO_(2)封存目前存在的主要问题,并强调了迫切需要开展的相关研究工作。研究成果对促进燃空区及其场地再利用具有一定的理论和实践指导意义。

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 paper 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.Furthermore,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 CO_(2)storage with underground coal gasification based on the bottlenecked geological storage of CO_(2).The impacts of gasifier parameters on the fracture development law of cap rock was analyzed after supercritical CO_(2)storage 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 CO_(2)storage.Finally,the main issues of underground coal gasification coupled with CO_(2)storage were proposed,and the urgent implementation of related research work was stressed.There is some theoretical as well as practical significance to the results of this study with regard to the reutilization of the combustion space area and related sites.