Inderscience Publishers

Influences of temperature and moisture on coal sorption characteristics of a bituminous coal from the Sydney Basin, Australia

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Accurate testing of coal isotherms plays a significant role in the areas of coal seam gas drainage, outburst control, CO
2
geo-sequestration, coalbed methane (CBM) and enhanced coalbed methane recovery (ECBM). Coal isotherms were tested with CO
2
and CH
4
gases with a modified indirect gravimetric method in the University of Wollongong (UOW), Australia. The adsorption capacity of coal shows a linear decrease with increasing temperature. The decreasing rate of adsorption capacity is greater for CO
2
than CH
4
, and which is also higher for dry coals. The moist coal sample isotherms for both CO
2
and CH
4
demonstrate a much lower sorption capacity. The average reduction ratio of coal adsorption capacity of CO
2
and CH
4
with moisture is 11.1% and 14.0%, respectively in the testing temperature range. The experimental results show that moisture content in coal has greater effect on the adsorption capacity of CH
4
than that of CO
2
.

Keywords: temperature, moisture, indirect gravimetric method, coal sorption, isotherm, adsorption capacity, particle size, CO 2, CH 4, Australia

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