A remining technology of underground coal gasification at Zhongliangshan Coal Mine

The field trail used a mixture of steam and air with various levels of oxygen enrichment. Steady conditions were achieved in the field trail which produced high quality hydrogen-enriched syngas. To understand and optimize the UCG process, a simplified heat and mass transfer model was presented, providing a predictive tool for temperature and the major constituents of the syngas production. The model is compared with the field trail measurements for air and two levels of oxygen enrichment, showing reasonable agreement for the channel temperature and product syngas concentration profile.