水分润湿过程中煤中瓦斯解吸规律试验

发布时间：2018-05-10 12:46

  本文选题：安全工程 + 含水率　； 参考：《安全与环境学报》2017年04期

【摘要】：为了深入探讨水分对煤中瓦斯解吸特性的影响,采用试验和理论分析相结合的方法,按照原煤的固有粒度配比加工制作型煤,充分干燥后使其吸附平衡以模拟原始煤体,然后利用自制的试验装置实现水分自然进入含瓦斯煤,再测试水分润湿含瓦斯煤过程中样品缸内的瓦斯压力变化情况。结果表明:水分润湿含瓦斯煤过程中样品缸内瓦斯压力不断升高,水分能置换出煤中吸附瓦斯;相同吸附平衡压力下,煤样含水率越高,水分占据的有效吸附位越多,累计瓦斯解吸量越大,当煤样含水率达到煤的极限吸水率时,累计瓦斯解吸量达到极限值;同一含水率条件下,随吸附平衡压力增长,煤样吸附饱和度逐渐增加,水分越难进入煤体内部细微孔隙,造成累计瓦斯解吸量逐渐增加,但增幅逐渐减小,随吸附平衡压力不断升高,极限瓦斯解吸量趋于一定值。
[Abstract]:In order to explore the effect of water on the gas desorption characteristics of coal, the method of combining experimental and theoretical analysis is used to process the briquette in accordance with the inherent grain ratio of the raw coal. After fully drying it, the adsorption balance is made to simulate the original coal, and then the water naturally enters into the coal containing gas and then the moisture is tested by the self-made experimental device. The results show that the gas pressure changes in the sample cylinder in the process of gas coal containing gas. The results show that the gas pressure in the sample cylinder increases continuously during the wetting of the coal containing gas, and the water can replace the adsorbed gas in the coal. Under the same adsorption equilibrium pressure, the higher the water content of the coal sample, the more effective adsorption position of the water occupied, the more the accumulated gas desorption volume. When the coal sample water content reaches the limit water absorption of coal, the accumulated gas desorption capacity reaches the limit value; under the same water content condition, with the increase of adsorption equilibrium pressure, the adsorption saturation of coal samples increases gradually, the more difficult the moisture is to enter the fine pores in the coal body, resulting in the cumulative increase of the amount of gas solution absorption, but the increase gradually decreases with the adsorption equilibrium. With increasing pressure, the limit gas desorption volume tends to a certain value.

【作者单位】： 河南理工大学安全科学与工程学院;煤矿灾害预防与抢险救灾教育部工程研究中心;
【基金】：国家自然科学基金项目(51274090)
【分类号】：TD712
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本文编号：1869367