密封取样煤的瓦斯解吸规律实验研究
Experimental Study on Gas Desorption Law of Coal by Seal Sampling
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摘要: 基于自制的煤体瓦斯吸附-解吸实验装置，实验室模拟了反转密封取样过程，开展了不同吸附平衡压力下和不同密封时间的瓦斯解吸实验。针对实验过程中的煤样瓦斯吸附平衡-卸压-密封过程，分析了煤样罐中的瓦斯压力变化。结果表明：卸压密封过程瓦斯压力逐渐增大，是一个由非平衡状态向吸附平衡状态转变的过程，理论上随着时间的延长，最终趋向于吸附平衡状态。密封取样的瓦斯解吸是非平衡状态下的瓦斯解吸过程，其初始瓦斯解吸量明显大于常规解吸的瓦斯解吸量，随着吸附平衡压力的增大和密封时间的增大，初始瓦斯解吸量越大，其解吸规律与常规解吸基本相似。Abstract: The reversion seal sampling processes was simulated in the laboratory by using self-designed gas adsorption and desorption experiment device. The gas desorption experiments were done under different adsorption equilibrium pressure and seal time. Considering the process of adsorption equilibrium, discharging pressure and seal, the gas pressure of coal sample tank were analyzed. The experimental results showed that the gas pressure of discharging pressure process increase gradually and it was a process from nonequilibrium state to equilibrium state. Theoretically, as time went on, conditions may finally be equilibrium state. The gas desorption of coal by seal sampling is a nonequilibrium state desorption process, and the initial desorption gas is pronouncedly larger than conventional desorption gas. The desorption gas increases as adsorption equilibrium pressure and seal time increases, and its adsorption law is very similar to that of conventional desorption.
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Keywords:
- seal sampling /
- clastic coal /
- gas desorption /
- gas content /
- adsorption equilibrium
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