231 / 2018-05-05 11:16:04

Analysis of Influencing Factors on Residual gas content Results in Laboratory

residual gas content; ash; volatile matter; moisture; sampling method

矿井瓦斯与煤与瓦斯突出 > 煤矿瓦斯

In view of the current situation that the concept of residual gas content in coal seam in our country is relatively chaotic, the definition of residual gas content and the measurement principle of degassing and desorption methods in “The direct method of determining coalbed gas content in the mine”are analyzed. The standard unified method and the explicit concept is proposed . Through the laboratory desorption experiments in some mining areas, it is found that the residual content of gas and the degree of coal metamorphism are positively correlated as a whole. There is a negative correlation between the content of ash and internal moisture in coal and the residual content of gas. The order of the residual gas content of different sampling methods is as follows: core sampler> hydraulic slag sampler ≈ wind slag sampler, coal structure is complete, the change range of measured data is the smallest with core sampler, which can truly reflect the law of coal desorption and status.