内循环式浆料好氧发酵反应器的流场与传热分析及其参数优化  

Flow field and heat transfer and parameter optimization of an internal circulation slurry aerobic fermentation reactor

作　　者：石贵振 王永江 SHI Guizhen;WANG Yongjiang(College of Engineering,Huazhong Agricultural University,Wuhan 430070,China)

机构地区：[1]华中农业大学工学院,武汉430070

出　　处：《华中农业大学学报》2021年第6期203-210,共8页Journal of Huazhong Agricultural University

基　　金：国家自然科学基金项目(31601226)。

摘　　要：为研究内循环式浆料好氧发酵反应器内浆料的流动与传热特性,进一步优化反应器的工作参数,基于计算流体力学软件,通过单因素仿真试验,分别研究不同转速(60、120、180、240 r/min)对浆料循环效果的影响以及不同加热温度(45、50、55、60℃)在一定转速下对浆料升温的影响;并搭建小型试验台架,利用试验台架对导流筒出口处的流速分布和罐体壁面上的温度分布进行验证。试验结果表明:搅拌器的转速为120 r/min时,非搅拌区域浆料的速度区间为0.01~0.27 m/s,流速矢量波动较小,浆料具有更高的循环速率,搅拌器的单转循环流量为3.77 L/r;在壁面加热温度为55℃、转速为120 r/min工况下加热5 min,可使浆料平均温度从15.00℃上升至36.98℃,升温效果明显;实测结果与模拟结果表现出较好的一致性,流速实测值与模拟值的相对标准偏差为14.29%,温度实测值与模拟值的相对标准偏差为10.78%。This article carried out two single-factor simulation experiments based on computational fluid dynamics software to study the effects of different speeds(60,120,180,240 r/min)on the slurry circulation and the effects of different heating temperatures(45,50,55,60℃)on the temperature increase of the slurry at a certain speed in order to study characteristics of the flow and heat transfer of the slurry in the internal circulation slurry aerobic fermentation reactor,and to further optimize the working parameters of the reactor.To verify the computational model,a bench reactor was built to collect actual data of flow velocity distributed at the outlet of the diversion tube and temperature on the wall of the kettle body.The results showed that when the rotation speed of the stirrer was 120 r/min,the speed range of the non-stirring domain was 0.01-0.27 m/s,and the velocity vector had smaller fluctuations.A rotation speed of 120 r/min had a higher rate of circulation,with a circulation flow rate per revolution of stirrer of 3.77 L/r.When heating temperature of the wall was 55℃,heating at 120 r/min for 5 min increased the average temperature of the slurry from 15.00℃to 36.98℃,indicating that the heating effect is obvious.The agreement between the measured results and the simulated results was good.The relative standard deviation between the measured value and the simulated value of the flow rate was 14.29%.The relative standard deviation between the measured value and the simulated value of the temperature was 10.78%.It was proved that the computational model is an effective way of describing the complex and dynamic circulation process of the stirring bioreactor.It will provide a theoretical basis for optimizing the working parameters of reactor.

关 键 词：发酵反应器 内循环式 好氧发酵 浆料流场 流动特性 传热特性 堆肥反应器 废弃物资源化利用 

分 类 号：X703[环境科学与工程—环境工程]