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The differences in the gas thermophysical properties (including heat capacity, thermal conductivity and diffusivity) between char combustion in wet and dry environments have remarkable influences on the combustion process. We conducted a detailed experimental study on the thermal effects of H 2 O on the coal char combustion at 1773 K in a high-temperature drop tube furnace (HTDTF). An appropriate portion of Ar was introduced into the bulk gas (O 2 /H 2 O/N 2 ) during combustion to eliminate the opposed thermal effect of H 2 O. Results indicate that the H 2 O thermal effect initially increased with higher H 2 O concentrations from 0 to 10 vol.%, but it declined with a further increase in H 2 O concentrations in the bulk gas. Meanwhile, its effect was dominant in the preliminary and middle stages of char burning at low H 2 O concentrations. The increased H 2 O concentration and residence time promoted the gasification reaction and the water-gas shift reaction so as to weaken the negative thermal effect of H 2 O and improve the carbon conversion. In the 15%O 2 /5%H 2 O/80%N 2  environment, the relative contribution of thermal effects to carbon conversion ratios ranked up to −36% at the residence time of 0.3 s, but it decreased to −0.3% at 21%O 2 /30%H 2 O/49%N 2  atmosphere and the residence time of 0.4 s.

Experimental Studies on Thermal Effect of H 2 O on the Combustion of Pulverized Coal Char