摘要
为了实现农林剩余物玉米秸秆、玉米芯和小麦秸秆的一种或多种混合物的预处理浆料的快速降黏液化,笔者进行了降黏研究。笔者对混合物中物料搅拌降黏机理提出假设,并利用CFD仿真技术对搅拌器结构、物料预处理类型及液化工艺组合的搅拌降黏体系进行液固两相流非稳态数值仿真,探究了速度场、湍流场的分布情况,确定了生物反应釜结构、尺寸及降黏液化工艺,最后进行了试验验证。结果表明:当反应釜上搅拌器直径为70mm、下搅拌器直径为75 mm,物料为酸处理下平均粒径为830~1450μm的颗粒,搅拌转速为200~300r/min时,搅拌液化的效果最优;由此确定了搅拌降黏体系,试验验证效果较好。CFD仿真结果可为浓稠物料反应釜搅拌器的设计及液化糖化工艺优选提供参考。
In order to achieve rapid viscosity reduction and liquefaction of pretreatment slurry of one or more mixtures of agricultural and forestry residues such as corn stover,corn cob,and wheat stover,the viscosity reduction research was conducted.The viscosity reduction mechanism of the materials in the mixture was assumed,and the CFD simulation technology was used to creatively simulate the unsteady state of the liquid-solid two-phase flow of the stirring viscosity reduction system with the combination of stirring structure,material pretreatment type and liquefaction process,and the distribution of velocity field and turbulent flow field was explored,and the structure size of the bioreactor and the viscosity reduction liquefaction process were determined.The results show that the average particle size of the material with an average particle size of 830 to 1450μm in the reaction kettle with the size of 70 or 75 mm and the upper and lower stirrers.Under the condition of 200 to 300 r/min stirring speed,the optimal effect of stirring liquefaction process can be realized,so that the stirring viscosity reduction system with reduced viscosity is determined,and the test verification is carried out at the same time,and the effect is ideal.The CFD simulation results and analysis can provide a reference for the design of the agitator of the reactor and the optimization of the liquefaction and saccharification process.
作者
张超
陈涛
周中林
杨健
张华
肖宗亮
ZHA NG Chao;CHEN Tao;ZHOU Zhonglin;YANG Jian;ZHANG Hua;XIAO Zongliang(Luzhou Laojiao Group Co.,Itd.,Luzhou,Sichuan 646000,China;Zuiqingfeng Liquor Co.,Ld.,Luzhou,Sichuan 646000,China;Collge of Energy Engineering,Zhejiang University,Hangzhou 310013,China;Siemens Ltd.China,Shanghai 200082,China)
出处
《轻工机械》
CAS
2024年第5期44-50,共7页
Light Industry Machinery
基金
国家自然科学基金项目(52075487)。
关键词
生物反应釜
降黏
液化工艺
非稳态数值仿真
液固两相流
bioreactor
viscosity reduction
liquefaction process
unsteady state simulation
liquid-solid two-phase flow
