Carbon Monoxide Index Monitoring System in an Underground Coal Mine.
SME/AIME Transact 1976 Dec; 260:312-318
Experiments at the Somerset Mine, Colorado, under an agreement between U.S. Steel Corp. and the U.S. Bureau of Mines are described. A test was made of the tube bundle method of mine air sampling which was developed for European longwall mines; some 300,000 running feet of tubing provided continuous monitoring at 38 locations. Carbon monoxide concentrations were obtained with standard deviations of less than 1 ppm and oxygen concentrations with standard deviations of less than 0.2 pct. A base level of CO index (ppm CO evolved per pct o2 removed) was determined to be zero to 20 through most of the passageways of the mine. However, in one working section where the coal was initially hot (about 180 deg f within a pillar) the co index was demonstrably higher, >20 trending upward to about 60 when smoke appeared and the section was sealed. The data are discussed in terms of laboratory experiments on CO evolution from coals.
SME/AIME Transact., V. 260, December 1976, PP. 312-318