鄂尔多斯盆地杭锦旗地区煤样地下气化物理模拟实验  

Physical Simulation Experiment of Underground Gasification of Coal Samples at Hangjin Banner in the Ordos Basin

作　　者：刘争芬 刘淑琴[2] LIU Zhengfen;LIU Shuqin(Petroleum Engineering Technology Research Institute of North China Oil and Gas Branch Company of SINOPEC,Zhengzhou 450006,China;School of Chemical&Environmental Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China)

机构地区：[1]中石化华北油气分公司石油工程技术研究院,郑州450006 [2]中国矿业大学(北京)化学与环境工程学院,北京100083

出　　处：《油气与新能源》2024年第5期68-74,共7页Petroleum and new energy

基　　金：北京市科学技术委员会能源与材料领域应用技术协同创新资助项目“深部煤层原位转化低成本制氢关键技术研究及装备研制”(Z201100004520012);中国石油化工股份有限公司技术开发项目“鄂尔多斯盆地深层煤气化可行性研究”(P21103)。

摘　　要：鄂尔多斯盆地北部杭锦旗地区煤炭资源丰富,煤层地下气化是安全清洁高效开发利用煤炭资源的潜在途径。利用杭锦旗地区新井渠深部钻井取得的煤样,开展了煤层地下点火实验和气化燃烧物理模拟实验,为现场先导试验提供依据。实验结果表明:高压条件下气化剂氧气浓度增加可显著降低煤层着火点,3 MPa条件下30%富氧气浓度可以使大块煤样的着火点从空气条件下的490℃降低至390℃;煤样整体气化反应活性较好,水蒸气反应活性优于CO_(2),1 000℃条件下CO_(2)及水蒸气均可被有效地还原;氧气浓度和含水量对气化产出物组分影响较大,水氧比越高,产出煤气中H2和CO_(2)含量越高,CO含量明显减少;氧气浓度越高,产出煤气有效组分越高;注气点后退气化工艺可有效控制火区实现稳定气化,产出煤气有效组分浓度可稳定在55%~65%,且随着气化压力升高,甲烷浓度明显提高。实验揭示的规律特征可为矿场试验点火、气化剂配比设计以及气化稳定控制等提供参考。Hangjin Banner in northern Ordos Basin is rich in coal resources and underground gasification of coal seam is a potential way to develop and utilize coal resources safely,cleanly,and efficiently.Therefore,the underground ignition experiment and physical simulation experiment of gasification combustion were carried out by using the deep drilling coal samples in Hangjin Banner,which provided the basis for future field pilot experiments.The experimental results show that increase of the oxygen concentration of gasification agent under high pressure could significantly reduce the ignition point of coal seam,the ignition point of large coal sample can be reduced from 490℃to 390℃under the condition of 3 MPa and 30%oxygen-enriched concentration,the overall gasification reactivity of coal samples is quite good as well as the reactivity of water vapor is better than that of carbon dioxide,and both carbon dioxide and water vapor can be effectively reduced at 1000℃.The oxygen concentration and water content have great influence on the composition of gasification products.The higher the water-oxygen ratio,the higher the H2 and CO_(2) contents in the produced gas,but the lower the CO content.The higher the oxygen concentration,the higher the effective components of the produced gas.The backward gasification process of gas injection point can effectively control the fire area to realize stable gasification,and the concentration of effective components in the produced gas can be stabilized between 55%and 65%.The methane concentration increases obviously with the increase of gasification pressure.The laws and characteristics revealed in this experiment can provide reference for field test ignition,gasification agent ratio design,and gasification stability control.

关 键 词：煤炭地下气化 点火 气化反应性 后退气化稳定控制 气化剂氧气浓度 

分 类 号：TD84[矿业工程—煤矿开采]