新型近零排放煤气化燃烧利用系统的优化及性能预测

针对所构建的以CO2接受体法气化为基础的新型近零排放煤气化燃烧利用系统,以热力学平衡计算软件包FactSage5.2来预测气化炉及燃烧炉的产物组成。在此基础上建立了基于物质平衡、能量平衡的系统效率计算方法。以提高系统效率为目标,对系统压力和气化炉碳转化率这两个重要参数进行了优化。结果表明,系统效率随操作压力和气化炉碳转化率增加而呈上升趋势。在综合考察压力和碳转化率对系统效率、气化炉和燃烧炉性能的影响规律后,比较合适的系统压力和气化炉碳转化率分别为2.5MPa和0.7。在该运行参数下,系统发电效率达到了62.1%。若采用先进的氧离子输送膜(ITM)制氧方法,系统效率可提高1.3%。

Optimization and Performance Prediction of a New Near Zero Emissions Coal Utilization System with Combined Gasification and Combustion

According to our new near zero emissions coal utilization system with combined gasification and combustion,which is based on the CO2 acceptor gasification process,the product gas composition of the gasifier and the combustor were calculated by means of thermodynamic equilibrium calculation software FactSage 5.2.Based on these calculations,the whole system efficiency calculation method that complies with the mass and energy conversion principle was established.Aimed at enhancing the system efficiency,the system pressure and the gasifier carbon conversion ratio were optimized.The results indicate that the system efficiency increases with increasing of the pressure and the gasifier carbon conversion ratio.After the influences of the pressure and the carbon conversion ratio on the performance of the system,gasifier and the combustor were synthetically studied,the optimum pressure and the carbon conversion ratio were obtained respectively as 2.5 MPa and 0.7.The system efficiency could achieve around 62.1% when the system operated in these two optimum parameters.If the advanced ITM air separation technology is used,the calculation system efficiency will be increased 1.3%.