气流床粉煤气化的Gibbs自由能最小化模拟

用Gibbs自由能最小化方法对粉煤气化过程进行了热力学平衡分析。对一混合煤种，在3.0 MPa和气化温度限制在1 200 ℃～1 450 ℃时，研究了氧-煤比、蒸气-煤比对气化炉出口气体组成、温度和有效气产率的影响，并由此确定了可行的操作域是氧-煤比545m3/t～605 m3/t、蒸气-煤比为152.64 kg/t～313.92 kg/t及其对应的工艺指标。从操作域中选择有代表性的工艺条件为氧-煤比578 m3/t、蒸气-煤比为187 kg/t，对应的气化炉出口温度1 358 ℃，CO+H2干基体积分数为91.5%，有效气产率为2.123(CO+H2)m3/kg。同时，研究了碳转化率和热损失对气化工艺指标的影响，其影响是显著的。

Thermodynamic analysis of entrained-flow pulverized coal gasification by Gibbs free energy minimization

The entrained-flow pulverized coal gasification process was thermodynamically analyzed by Gibbs free energy minimization method. For a given coal , the effects of oxygen-coal ratio and steam-coal ratio on the crude syngas composition, gasification temperature and the yield of CO+H2 were studied under the operating pressure of 3.0 MPa and gasification temperature ranging from 1 200 ℃ to 1 450 ℃. The thermodynamic analysis results of the reasonable operation ranges (545 m3/t to 605 m3/t coal for oxygen-coal ratio and 152.64 kg to 319.32 kg steam/t coal for steam-coal ratio) and the corresponding gasification performance (typically, CO+H2 91.5 v%(dry base), gasification temperature 1 358 ℃ and syngas yied of 2.123 CO+H2 m3/kg coal) are obtained. At the same time, the study of the effects of carbon conversion efficiency and heat lost on the gasification performance shows that the effects are remarkable.