APPLICATION OF CHROMATOGRAPHIC ANALYSIS FOR EARLY DETECTING IGNITION IN COAL SEAMS

In this paper, a combined chromatograph-mass spectrometer is used to qua-litively analyse the coal samples from 2402 Coal Seam in No.3 Pit of Nantong Un derground Coal Mine and gas components emitted from coal at different temperatures. A gas chromatograph is used to measure the contents of O_2, N_2, CH_4, CO, CO_2 and C_2H_4. It have proved that CO and C_2H_4 are indicator gases to early detect self ignition of coal seams. The indicator gases are of significance to predict self-ignition of coal in underground mine, and exploit coal safetg.