利用CFD方法优化沼气发酵罐内流场形态的研究综述

A Review on Optimization of Flow Pattern in Biogas Anaerobic Digester by CFD Method

料液搅拌是现代沼气工程不可或缺的附属工艺,能够大幅提升发酵效率。利用计算流体动力学(Computational Fluid Dynamics,CFD)方法模拟计算料液在厌氧消化罐内的流动过程,可以得到流场分布图,实现流场可视化,根据图形识别流场形态的特点和缺陷,优化设计搅拌形式和运行参数。近年来,利用CFD方法模拟沼气发酵料液搅拌的研究,在优化设计罐型、搅拌形式、搅拌运行参数、料液混合方式等方面都取得了极大进展,提升了沼气科学研究的层次,是沼气科学发展史上的一个重要阶段,并代表了未来的发展方向,文章综述了该阶段的研究进展。

Stirring is very important affiliated technology in modern biogas plants,which can significantly enhance the fermentation efficiency. Adopting the method of Computational Fluid Dynamics（ CFD）,simulating the flow pattern of the anaerobic digesters,the pictures of flow pattern could be obtained and the visualization of flow pattern could be realized,and the characteristics and defects of flow pattern could be recognized according to the flow pattern pictures,and so the stirring form and operating parameters could be optimized. In recent years,the CFD method has been used to simulate the stirring of biogas fermentation broth,the optimization has made great progress in aspect of tank type design,stirring form,operation parameters,and material and liquid mixing mode. It has promoted scientific research level on biogas,and is an important stage in the development history of biogas science. This paper summarized the research progress of this stage.