EFFECTS OF FLUXING AGENTS ON GASIFICATION REACTIVITY AND GAS COMPOSITION OF HIGH ASH FUSION TEMPERATURE COAL

A Na-based fluxing agent Na2O (NBFA) and a composite fluxing agent (mi)dure of CaO and Fe2O3 with mass ratio of 3:1, CFA for short) were used to decrease the ash fusion temperature of the Dongshan and Xishan coal from Shanxi of China and make these coal meet the requirements of the specific gasification process. The main constituents of the fluxing agents used in this study can play a catalyst role in coal gasification. Thus, it is necessary to understand the effect of fluxing agents on coal gasification reactivity and gas composition. The results showed that the ash fusion temperature of the two coal used decreased to the lowest point due to the eutectic phenomenon when 5 wt.% of CFA or NBFA was added. Simultaneously, the gas molar ratio of H-2/CO changed when CFA was added. A key application was thus found where the gas molar ratio of H-2/CO can be adjusted by controlling the fluxing agent amount to meet the synthetic requirements for different chemical products.