煤直接液化残渣焦CO2气化反应的研究

比较了流化床条件下神华煤及其直接液化残渣焦在CO2气氛中的气化反应性，考察了添加液化催化剂、脱除矿物质以及脱除重质油对煤直接液化残渣气化反应的影响规律。结果表明，残渣焦的气化反应性比原煤焦好，残渣焦在1000℃和1100℃的气化反应性指数为0.135和0.290，而原煤焦的则为0.118和0.200。脱灰后残渣焦气化反应性低于脱灰后的煤焦，说明直接液化反应后剩余的难液化物质的气化反应性低于煤焦；未经脱灰处理的残渣焦气化反应性高于煤焦，反映了液化过程中富集的矿物质及铁系催化剂的催化气化活性。脱除残渣中的重质油会降低残渣焦的气化反应性。

Gasification characteristics of coal liquefaction residues with carbon dioxide

The effective utilization of residue from direct coal liquefaction is important in both economic and environmental concern. Gasification behavior of Shenhua coal and the residues from the direct liquefaction of the Shenhua coal was investigated and compared using a fluidized bed reactor combined with gas chromatography (GC) analysis. The effect of remained and enriched mineral, catalyst and heavy oil on CO2 gasification of residue char was examined. The results show that the residue char has a better gasification activity than the raw coal char. The gasification reactivity index of the residue char is 0.135 and 0.290 at 1000℃ and 1100℃，respectively; but that of raw coal char is 0.118 and 0.20, respectively. The gasification reactivity of acid washed residue char (AR) is lower than that of acid washed coal char (AC), but the gasification reactivity of untreated residue char is greater than that of the raw coal char, which indicates that the remained and enriched mineral is a good catalyst for residue gasification. The Fe based catalyst added during direct liquefaction also has a catalytic effect on the gasification process. Removal of heavy oil from the liquefaction residue leads to the decrease of the gasification reactivity of residue char.