基于ChemCAD的气流床粉煤加压气化工艺参数仿真优化

摘要

The simulation model of typical entrained flow pressurized coal gasification,Shell coal gasification process,was founded based on ChemCAD simulation software.The minimum Gibbs free energy method was used as the reaction model of the coal gasification.In order to analysis the effect of the main process parameters,oxygen-coal ratio,steam-coal ratio and pressure,on the performance of the coal gasification,full factorial simulation experiments were carried out.The results show that the oxygen-coal ratio is an important factor to the gas production rate and the component of the syngas,and also impact significantly to the consuming indicators of the coal gasification.The efficiency indicators such as gas production rate increase with the oxygen-coal ratio increasing,while the consumption indicators reduce.The steam-coal ratio can enhance the syngas production rate,but mainly affect the amount of H2 in the syngas.The consuming indicators of the coal gasification are also affected by the steam-coal ratio.The effect of pressure on the gasification performance is not significant.Then,an integrated balanced optimization method was put forward to optimize the parameters based on the method of main effect analysis and range analysis.This method can find a set of process parameters to optimize all the indicators of the coal gasification performance combined as a whole as best as possible.%基于ChemCAD仿真软件,采用Gibbs最小自由能方法作为气化反应模型,建立了Shell粉煤加压气流床气化仿真模型。针对氧煤比、蒸汽煤比和气化压力3个主要工艺参数,安排了3因子3水平的全析因仿真实验,分析了各工艺参数对气化性能的影响。结果表明：氧煤比是影响产气率和粗煤气有效成分的重要因素,同时对消耗指标的亦有显著影响。产气率等效益指标随氧煤比的增加而增加,而消耗指标则随氧煤比的增加而减少;蒸汽煤比可以提高产气率,但主要影响H2的含量,各消耗指标会随着蒸汽煤比的增加而减少;压力对煤气化性能指标影响不显著。