Experimental Study of the Raw Coal Desorption Method On the Corresponding Relation between Coal Seam Gas Pressure and Content

The commonly-used method of high-pressured capacity has a problem that the experimental result has certain deviation with the actual result, when it takes the dry coal sample for the adsorbed quantity of gas test. To solve this problem, the paper employs the raw coal desorption method with raw coal sample which includes the natural moisture content desorption to achieve the adsorption pressure balance. According to the experimental result analysis, under the different moisture content and in different distributed condition, the coal seam adsorbed quantity of gas increases along with the gas pressure lifting, which follows certain linear statistics rule between them, and the rate change increases along with the increases of moisture content. As a whole, the dispersing relations of the adsorbed quantity of gas and the gas pressure range of variation control in the banding regions between two straight lines. It is advantageous for calculating the gas content scope corresponding with the applied coal seam gas pressure. (C) 2011 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of China Academy of Safety Science and Technology, China University of Mining and Technology(Beijing), McGill University and University of Wollongong.