Abstract Coal and gas outbursts (hereinafter referred to as ‘outbursts’) result in serious damage and often occur in tectonically-deformed coal that is rich in gas. It has been demonstrated that the level of outburst risk declines with increasing coal moisture content. Moreover, an outburst generally lasts for mere tens of seconds and the required energy is mainly provided by the gas expansion energy. However, the gas desorption and energy release characteristics of tectonically deformed coal with different moisture contents during the first dozen seconds have not often been studied. In this study, a set of self-designed gas desorption equipment was used to carry out gas adsorption-desorption experiments in the first dozen seconds (about 13 s) on coal with different moisture contents. The results show that the drop rate of the gas pressure increases with an increase in coal moisture content, and the total amount of gas desorption and the mass flow rate of gas desorption reduce correspondingly in the gas desorption process. Moreover, the gas velocity also slows with increasing moisture content. Under different gas pressures, the total gas expansion energy (TGEE) and the total gas energy (TGE) released from the coal decrease with the increasing moisture content. Correspondingly, it takes a shorter time for coal to release 90% of the TGEE and the TGE. For all of the coal samples, the time taken for releasing 90% of the TGEE is shorter than that for releasing 90% of the TGE. Meanwhile, the ratio of TGEE in the TGE increases with the increasing moisture content. The TGEE accounts for 14–16% of the TGE released from coal samples of different moisture contents under different gas pressures.

中文翻译：

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煤水分对初始瓦斯解吸和瓦斯释放能量特性的影响

摘要 煤与瓦斯突出（以下简称“突出”）危害严重，常发生在构造变形的富瓦煤中。已经证明，突出风险水平随着煤含水量的增加而降低。而且，一次爆发一般只持续几十秒，所需能量主要由气体膨胀能量提供。然而，不同含水量的构造变形煤在最初的几十秒内的气体解吸和能量释放特性还没有经常被研究。本研究利用一套自行设计的气体解吸设备，对不同含水率的煤进行了最初十几秒（约13 s）的气体吸附-解吸实验。结果表明，随着煤水分含量的增加，瓦斯压力下降率增大，瓦斯解吸过程中瓦斯解吸总量和瓦斯解吸质量流量相应降低。此外，气体速度也随着水分含量的增加而减慢。在不同的瓦斯压力下，煤的总瓦斯膨胀能（TGEE）和从煤释放的总瓦斯能（TGE）随着水分含量的增加而降低。相应地，煤炭释放 90% 的 TGEE 和 TGE 所需的时间更短。对于所有煤样，释放 90% TGEE 所需的时间都短于释放 90% TGE 所需的时间。同时，TGE中TGEE的比例随着水分含量的增加而增加。