Determination of Gas Content of Coal

Determination of gas content of coal is a Mining Engineering project done for final year project. Coal bed gas content measurements are normally carried to estimate methane emission rates into mine workings and for coal bed methane (CBM) gas recovery applications. Techniques of gas content determination are broadly divided into two categories, viz. direct methods which actually measure the volume of gas released from a coal sample sealed into a desorption canister and indirect methods based on empirical correlations, or laboratory derived absorption isotherm gas storage capacity data.



Direct gas content determination techniques are sub-categorized into quick-crushing and extended desorption methods. In quick-crushing methods the coal sample is crushed soon after collection to release all the desorbable gas. Extended desorption techniques are most commonly used for recovery applications and resource assessment where in formation on desorption rates is useful for fundamental coal bed methane research, and for reservoir modelling.

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Gas content is probably the most important parameter to be quantified in order to characterize a coal seam both from mine safety and gas recovery view points. Coal bed methane (CBM) is an environmental friendly clean fuel with properties similar to natural gas. Coal bed methane refers to methane adsorbed into the solid matrix of the coal. Objective of this study are as follows.

1. Study of occurrence and emission of methane.
2. Study of status of CBM extraction in India.
3. Collection of block/core samples from mines.
4. Determination of gas content of collected coal samples.
5 Correlation study of intrinsic properties of coal and its gas content.

Author:-C.V., Krishna Prasad

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