Signature Criteria for Monitoring Abandoned Mine Fires.
Proc 8th Ann Nat'l Abandoned Mine Lands Conf Mt Dept of State Lands 1987 :8-26
In this laboratory study, gases from mildly heated samples of coal and coal refuse were studied to develop a "signature" for indicating coal sample temperature. Controlled temperature environments were between 100 deg and 250 deg c, and the airflow rates over the sample were between 1 and 2 scf/h. A mixture of air and nitrogen was used at temperatures above 200 deg c to control self-heating of the coal to keep it at the desired temperature. Gas samples were taken periodically and analyzed by gas chromatography.
Proc 8th Ann. Nat'l Abandoned Mine Lands Conf. (Mt Dept. of State Lands), 1987, PP. 8-26