气流床粉煤气化性能模拟分析

基于Aspen Plus工作平台，运用Gibbs自由能最小化原理，对气流床粉煤气化过程进行了数值模拟，并对流程算法进行了改进。研究了氧煤比、蒸气煤比、压力及粉煤粒径对气化炉出口气体组成、温度、冷煤气效率、碳转化率及有效气产率的影响。结果表明：模拟值和实验值有良好的相似性；氧煤比对气化进程的影响较蒸汽煤比及其它操作条件更为显著；并确定了模拟煤种的最佳氧煤比是0．70～0．80kg／kg，气化炉出口CO＋H2的最大干基体积分数为96．48％，冷煤气效率最高为83．56％，最大有效气产率为1．74m^3／kg；氧煤比每升高0．1kg／kg，气化炉出口温度升高约40℃，而蒸汽煤比每升高0．1kg／kg，气化炉出口温度降低约8℃。

Entrained-flow pulverized coal gasification performance simulation analysis

Based on the process simulator---Aspen Plus software, the entrained -flow pulverized coal gasification process was simulated by Gibbs free energy minimization method, the flow arithmetic was improved also. The effects of oxygen-coal ratio, steam-coal ratio, pressure and pulverized coal particle size on the crude syngas composition, gasification temperature, cold gas efficiency, carbon conversion efficiency and productivity of CO ＋ H2 were studied. The results show that the simulation and the experiment results fit well. Oxygen-coal ratio is one of the most important conditions for gasification process, which is more significant than the other conditions, and the best oxygen-coal ratio is 0.70- 0.80 kg/kg for simulated coal. The best parameters corresponding gasification process are CO ＋H2 volume fraction of 96.48% （ dry base）, cold gas efficiency of 83.56% and CO ＋ H2 yield of 1.74 m^3/kg coal. The gasification temperature is elevated about 40 ℃ when the oxygen-coal ratio is increased by 0. 1kg/ kg and reduced about 8℃ when the stream-coal ratio is increased by 0.1 kg/kg.