The test lean coal has lower rate of temperature increasing due to its lower reactivity. Its gasification rate gently changes and the efficiency of oxygen-steam gasificprocess was dit the UCG process is more stable and also has high gas yield.

• 瘦煤地下气化,气化煤层温度上升缓慢,其气化活性较低,气化速率变化平缓,纯氧-水蒸汽气化效率为74%25,但气化过程稳定,且具有高的煤气产率,可以进行地下气化;