为研究O2/CO2作为气化剂在褐煤地下气化过程中的气化效果,通过地下气化模型试验系统,分别对比了O2/CO2和O2/Air这2种气化方式的炉内温度场分布、出口煤气组成以及污染物排放效果,并对O2/CO2气化方式所产生的CO2减排量进行了计算.试验结果表明:高浓度CO2的存在可以延长气化时间,使炉内温度场向垂直方向分布;含氧体积分数60％时,O2/CO2和O2/Air气化速率相近,温度变化相似,并能获得最大的出口煤气热值;含氧体积分数为40％时O2/CO2气化可以获得最大的CO2减排量,比O2/Air气化减少燃煤量40％左右;在整个气化过程中,O2/CO2气化比O2/Air气化可以显著降低H2S和NH3的排放量.%In order to study the effect of O2/CO2 as gasification agent in underground coal gasification (UCG),temperature field,gas composition and pollution emission were contrasted in two ways of O2/CO2 and O2/Air gasification experiment on a model test of UCG plant,at the same time,CO2 emission reduction were calc ulated for O2/CO2 gasification.The result shows that high content of CO2 will extend the gasification time and make the temperature field be distributed along the axial way;the gasification rate and temperature change is nearly the same when the content of O2 is 60％ in two ways,and the heat value of gas is extremely high in the O2/CO2 gasification;it is calculated that CO2 emission reduction can reach the biggest value for O2/CO22 gasification when O2 content is 40％,and the number of coal-burning will reduced by 40％ than O2/Air gasification.The emission of H2S and NH3 can be scientifically decreased in O2/CO2 gasification than that of O2/Air gasification.
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