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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。
In order to deeply investigate the influence of moisture on gas desorption characteristics in coal, the briquette was processed according to the ration of raw coal by the combination of experimental and theoretical analysis. The briquette was made fully dry and then equilibrated to simulate the original coal. Self-made test device to achieve the natural water into the gas containing coal, and then test the moisture content of gas in the sample gas cylinder in the process of gas pressure changes. The results show that the pressure of gas in the sample cylinder is continuously increased when the moisture is wetted with gas coal, and the moisture can displace the gas adsorbed in the coal. Under the same adsorption equilibrium pressure, the higher the water content of the coal sample, the more effective adsorption sites the water occupies , The greater the cumulative desorption amount of gas, when the water content of coal sample reaches the limit of water absorption, the cumulative desorption amount of gas reaches the limit; the same moisture content conditions, with the adsorption equilibrium pressure increases, the adsorption of coal samples gradually increased saturation, moisture The more difficult it is to enter the fine pores inside the coal, resulting in a gradual increase in cumulative desorption of gas, but the increase decreases gradually, with the adsorption equilibrium pressure rising, the ultimate gas desorption tends to a certain value.