煤中外加水分均匀性对瓦斯吸附解吸影响的研究现状

Research Status of Influence of Added Water Uniformity on Gas Adsorption and Desorption in Coal

为搞清外加水分及其均匀性对瓦斯吸附解吸影响的研究现状,通过查阅大量的文献,对煤中外加水分的均匀性,不同含水率煤样的制备及测定方法,水分对煤的瓦斯吸附解吸的影响等方面进行了综述。结果表明:对不同含水率煤样制备要考虑:水分加入方式,外加水分均匀性,定含水率煤制备3方面的内容;对煤中水分的测定方法常用的是称重法;外加水分含量对煤的瓦斯吸附起抑制作用,对煤的瓦斯解吸促进和抑制作用兼具,根据实验侧重点的不同重点表现某一作用;外加水分不均匀会改变煤的瓦斯放散特性,影响对煤瓦斯吸附解吸的研究。今后应加大对煤样水分均匀性制备和测定的关注,提高煤样代表性,增强实验结果准度,为煤矿井下安全生产提供科学依据。

In order to find out the research status of the influence of added water and its uniformity on gas adsorption and desorption, the homogeneity of added water in coal, the preparation and measurement methods of coal samples with different water content, and the influence of water on gas adsorption and desorption of coal were reviewed by looking up a large number of literatures. The results show that the preparation of coal samples with different water content should consider three aspects:water addition method, water uniformity and preparation of coal with fixed water content. Weighing method is commonly used for the determination of moisture in coal. The added moisture content inhibits the adsorption of coal gas, and both promoting and inhibiting effect on coal gas desorption, which shows a certain effect according to different experimental focuses. Uneven water will change the characteristics of coal gas release and affect the study of coal gas adsorption and desorption. In the future, more attention should be paid to the preparation and measurement of water uniformity of coal samples, so as to improve the representativeness of coal samples and enhance the accuracy of experimental results, so as to provide scientific basis for safe production in underground coal mines.