According to the unique properties of low-concentration coal-bed methane(CBM),we designed a 150 kW swirled partially premixed burner.An experimental study was conducted to investigate the effects of the burner structure on the low-concentration CBM combustion,and the controlling rules of velocity distribution,swirl intensity and methane concentration on temperature distribution during the combustion in the partial-premixed swirling burner.The following results were achieved.(1)This swirled partially premixe...