基于Aspen Plus的生活垃圾热解气化模拟及正交优化

热解气化技术作为一种城市固体废弃物(municipal solid waste, MSW)无害化处理的方式,其相关研究具有现实意义。利用Aspen Plus软件建立了MSW固定床热解气化模型,在模型验证的基础上探讨了气化温度、气化压力和空气当量比对MSW热解气化过程的影响。通过二次回归正交试验法得出MSW热解气化过程中气体产率、产气热值和气化效率与各工艺参数之间的函数关系,并利用Matlab软件对函数关系进行计算,求得最优工艺参数组合。结果显示:随着气化温度的升高,产气热值增加幅度降低,气体产率和气化效率均呈先增加后趋于稳定的趋势。各参数对气化效率的影响程度排序为空气当量比>气化温度>气化压力。当气化温度为891℃,气化压力为1.01×105 Pa,空气当量比为0.2时,气化效率达到最大。

SIMULATION AND ORTHOGONAL OPTIMIZATION ON PYROLYSIS AND GASIFICATION OF MSW BASED ON ASPEN PLUS

Pyrolysis and gasification technology, as a harmless treatment method of MSW, has great research significance. The MSW fixed-bed pyrolysis and gasification model was established using Aspen Plus software. The effects of gasification temperature, gasification pressure and air equivalent ratio on the pyrolysis and gasification process of MSW were discussed based on model verification. The quadratic regression orthogonal test method was used to obtain the mathematical relationship between gas yield, gas calorific value, gasification efficiency and process parameters. Matlab software was applied to solve the equation and get the best combination of process parameters. The results showed that with the increase of gasification temperature, the calorific value of gas production increased slightly, and the produced gas yield and gasification efficiency both increased first and then tended to be stable. The air equivalent ratio had the most significant influence on the gasification efficiency, followed by the gasification temperature, and then influence of gasification pressure. When the gasification temperature was 891 ℃, the gasification pressure was 1.01×105 Pa, and the air equivalent ratio was 0.2, the gasification efficiency reached a maximum.