Abstract: Chemical looping air separation （CLAS），as a promising oxygen production technology，was employed as an alternative of conventional air separation technique. A novel technique for integrated coal gasification system with CLAS was presented in this article. This novel system has been simulated and calculated by Aspen Plus software based on the Gibbs free energy minimization principle. The results presented that the H2，CO and CH4 showed slightly change with the change of reduction temperature as well as the temperature of gasification gas when reduction temperature was above 840℃，at the same time the cold gas efficiency was about 80%. The increase of circulation ratio of CO2 could lead to a decrease in steam consumptions and result in the increase of CO and cold gas efficiency. Gasification pressure had little influence on H2，CO and CH4. The cold gas efficiency was reduced and the temperature of gasification gas was increased with the increase of gasification pressure.

Key words: chemical looping air separation, coal gasification, integrated system, thermodynamic analysis, process simulation

摘要： 利用化学链制氧（chemical looping air separation，CLAS）取代传统空气分离制氧技术，提出了基于化学链制氧的煤气化集成系统。以Mn2O3/Mn3O4为氧载体，依据Gibbs自由能最小化原理，利用Aspen Plus对该集成系统进行模拟研究。结果表明，当还原温度高于840℃时，还原程度和粗煤气温度不随还原温度增加而发生明显变化，H2、CO和CH4流量及含量变化趋势较平缓，冷煤气效率为80%左右；随CO2循环比增大，水蒸气用量逐渐减少，粗煤气中H2流量和含量降低，CO流量和含量升高，CH4流量和含量基本不变，冷煤气效率升高，粗煤气温度降低。气化压力变化对粗煤气中H2、CO和CH4流量和含量无明显影响，气化压力升高会降低冷煤气效率，提高粗煤气温度。

关键词: 化学链制氧, 煤气化, 集成系统, 热力学分析, 过程模拟