Affected by different geologic factors, coal bed gas may be enriched and burst out in the low-rank coals.
由于各种地质因素的影响，低煤级煤煤层将有可能出现煤层瓦斯富集而发生瓦斯灾害的危险。
The properties of the low-rank coals heat-treated were investigated and the effects of such treatment on compressive strength of briquettes from the coals were observed.
研究了热处理低阶煤的性质及其对型煤抗压强度的影响。
Exploration and development of CBM from low-rank coals have been very successful in the world, and its exploration potential in China is very large because China is very rich in such resource.
世界范围内低阶煤层气勘探开发已获得了巨大的成功，中国拥有丰富的低煤阶煤层气资源，具有广阔的勘探前景。
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