Model test of underground coal gasification of Xinhe coal
Based on the model test of “rich-oxygen-steam” underground coal gasification (UCG) of Xinhe coal, the basic regularities of the UCG process was studied and the reasonable parameters were established for a power generation project by using the UCG technology.The proximate analysis,ultimate analysis and reactivity test of Xinhe coal were made.From the tests, the change of effective gas composition and heat value under different technical conditions was investigated.The result showed that a normal fuel gas can be obtained by blasting pure oxygen at the beginning of the test because there was some water in the coal bed.In the“rich-oxygen-steam”process, when the ratio of steam to oxygen was kept between 1.5∶1 and 2∶1, a fuel gas(effective composition about 70%,heat value about 10 MJ·m~ -3 )could be achieved.The average productivity of Xinhe coal was 1950 m~3·t~ -1 and the gasification rate of the coal seam was 74.6%.