Prospects of coalbed methane and coal mine methane in India

  • 01/03/2010

  • CIMFR

This document contains the presentation by Ajay Kumar Singh on prospects of coalbed methane and coal mine methane in India, presented at National climate research conference, IIT Delhi, March 5-6, 2010. Methane released in a mine is vented out to the atmosphere, causing accumulation of this potent green house gas in the environment. Several disasters have also occurred in the past due to explosion of methane in underground coal mines. Sufficient quantity of air is thus sent to the mines through ventilating fan to dilute the methane concentration. Of late, it has been established that methane present in coal can be recovered at commercial scale and used as a clean source of fuel. There is good potential of recovery of this gas for utilization as a clean fuel. Pre-mining degasification, recovery of Coal Mine Methane (CMM) and production of Abandoned Mine Methane (AMM) are feasible technologies. Low concentration of the gas in Ventilation Air Methane (VAM) may also be utilized. CBM recovery by injection of CO2 is known as the enhanced coalbed methane (ECBM) recovery technique. The injected CO2 displaces methane from the site of its adsorption in coal, resulting increased production of methane, while CO2 gets adsorbed in the coal micropores and is sequestered permanently. Prospects of CBM, CMM, AMM and VAM recovery and ECBM in India have been discussed in this paper. Extraction of the gas would make the underground mines safer, reduce the atmospheric load of methane and provide a clean source of energy. Some preliminary investigations at laboratory scale have been made to establish the absorption capacity of Indian coals for carbon dioxide. Some potential sites for CO2 storage in unmineable coal seams have also been presented.