流化床生物质气化动力学模型建立

Study on dynamic modeling method of biomass gasification on fluidized bed

在生物质气化建模中有两种模型研究方法,一种是热力学模型,一种是动力学模型。动力学模型以反应动力学为基础,能真实地反映气化炉内的气化过程,并且对最终生物质气化气成分的预测较为准确,从而能够保证找到一组最佳气化条件(气化温度、气化剂当量比等),使得生物质气化过程达到最优。本文借鉴煤气化动力学建模的启发,在综合考虑平衡模型和动力学模型优点之上,探讨了一种包括热分解、气化以及可能存在的二次反应三个过程在内的整体生物质气化动力学建模方法。

There are two methods in biomass gasification modeling; one is thermodynamic model, the other is kinetic model based on the chemical reaction kinetics, with which the gasification process can be really reflected and the final gas compositions can also be predicted relatively accurate, these guarantee that a group of optimal gasification conditions （temperature, gasification agent ratio, etc） could be found to make the biomass gasification process tend to global optimum. So drawing on the enlightenment of kinetic modeling of coal gasification and taking the advantages of equilibrium model and kinetic model, this article discusses a method of integrated kinetic modeling including three parts： pyrolysis, gasification, and the secondary reaction may be exist.