In order to mitigate the slagging risks of high-alkali coal (HAC) gasification while optimizing the operating temperatures for practical application, the experimental and calculational works were performed on the horizontal tubular furnace system and the FactSage 7.2 software, respectively. The slagging tendencies of three HACs were anticipated by applying different indexes of ash chemistry characteristics prior to experiments, but the determined results were found inconsistent. The relationship between Na retained ratio (R-Na) and the ash fusion temperatures (AFTs) of gasification residues demonstrated that the AFTs of coal with high R-Na are low, while AFTs of coal with low R-Na are high. Nevertheless, when the residues contained a large number of calcium-containing silicates and aluminosilicates, the ATFs were reduced significantly even if its R-Na stayed at a low level. Furthermore, the operating temperatures of the three coals (in order of Mulei coal, Shaerhu coal, and Tietou coal) were suggested to be controlled below 1150 ℃, 1100 ℃, and 950 ℃, respectively.
Source: JOURNAL OF THERMAL SCIENCE
DOI: 10.1007/s11630-021-1410-y Early Access Date: FEB 2021
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