高温铜渣催化木屑水蒸气气化的实验研究

Experimental Study on Steam Gasification of Sawdust with High Temperature Copper-containing Slag

利用高温铜渣的显热作为外热源，进行铜渣催化木屑水蒸气气化的实验研究，通过XRD分析催化反应前后铜渣的物相组成，结合催化气化后产气特性分析，推断铜渣的催化活性组分，测定气化反应前后铜渣的温度，计算铜渣的显热量和余热利用率．结果表明，催化气化后铜渣出现F0203特征峰，煅烧渣的F0203和Fe3O4特征峰减少且强度减弱．催化后H2含量明显增加，CH4和C2H4含量明显降低．由此推断铜渣的催化活性组分为Fe2O3和Fe3O4，其含量越高，铜渣催化效果越好．气化温度（720～950℃）范围内铜渣温度降低130～240℃，可回收利用的显热量为151．89～237．48kJ／kg，余热利用率达18．49％～22．63％．

Experiment of sawdust steam gasification catalyzed by copper-containing slag was carried out using its waste heat as external heat source. Catalytic activity components of the slag were inferred and catalytic activity was evaluated by analysing its phase composition before and after the catalytic reaction by XRD and characterization of gas product. Sensible heat and utilization rate of waste heat of the slag were calculated by determining the temperatures of catalyzed copper slag before and after gasification. The results show that untreated copper slag presents characteristic peaks of Fe203 and the number of characteristic peaks of Fe203 and Fe304 is reduced and their strength weakened for calcined copper slag after catalytic gasification. Volume fraction of H2 significantly is increased and volume fractions of CH4 and C2H4 are significantly reduced after catalytic gasification. It is infered that catalytic components of the slag are Fe2O3 and Fe3O4 and its catalytic activity is determined by the content of Fe203 and Fe304. The higher the content of Fe2O3 and Fe3O4, the better the catalytic activity of the slag. The recycling sensible heat of the slag and utilization rate of waste heat are 151.89-237.48 kJ/kg and 18.49%-22.63% respectively for the temperature reduction of the slag by 130-240℃ within the gasification temoerature range from 720 to 950 ℃.