Abstract
For the thorough research on coal metamorphism impact on gas adsorption capacity, this paper collected and summarized parameters of experimental adsorption isotherms, coal maceral, proximate analysis and ultimate analysis obtained from National Engineering Research Center of Coal Gas Control and related literatures at home and abroad, systematically discussed the coal rank effect on its physicochemical properties and methane adsorption capacity, in which the coal rank was shown in Vitrinite reflectance, furthermore, obtained the Semi-quantitative relationship between physicochemical properties of coal and methane adsorption capacity.
Highlights
Biological-sedimentary impact on various plants or plants in different positions under a certain geological history causes the differences of coal quality, coal petrology and ash contents
Through adsorption isotherm of methane in coal, the critical desorption pressure in coal reservoir can be determined, the coalbed gas reserves can be estimated and the saturation of the CBM can be determined, the extraction rate of coalbed methane can be predicted; The research for adsorption capacity of methane in coal can provide theoretical basis for industrial of CO2-methane displacement; and it is important for the prediction of gas emission quantity and the coal and gas outbursts for studying methane adsorption in coal
Resulting shows that coal methane adsorption characteristics is affected by many kinds of factors, including coal rank, coal type that can be expressed in terms of many physicochemical properties, e. g. proximate analysis, maceral composition, ultimate analysis, moisture content
Summary
Biological-sedimentary impact on various plants or plants in different positions under a certain geological history causes the differences of coal quality (expressed in ultimate content), coal petrology (expressed in maceral composition) and ash contents (obtained from proximate composition analysis). Maria Mastalerz (2004) and Cai et al (2013a, b) analyzed eight coals with similar coal rank but varying petrographic for CH4 sorption capacity using a high-pressure adsorption isotherm technique and determined the coal quality and petrographic composition of the coals to study their relationships to the volume of CH4 that could be sorbed into the coal. Different from the former research of using Limited quantity of coal samples, focusing on a certain coal mine, or a certain influential factor, data obtained from the National Engineering Research Center of Coal Gas Control (NERC) and the related literatures at home and abroad are collected to discuss the effect of physicochemical properties of coal on methane adsorption capacity by observing the changing rule of physicochemical properties of coal and methane adsorption capacity with coal rank separately. Because of the different research aims in different literatures, not all the data can meet requirements of this paper, we did some data transmission work to obtain a Semi-quantitative result and to strengthen the understanding of the factors influencing the adsorption capacity
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