基于CFD的卧式高固厌氧消化混合策略优化  

Optimizing mixing strategy of horizontal high solid anaerobic digestion based on CFD

作　　者：胡玉瑛 王鑫[1] 张世豪 胡锋平 汪楚乔[1] 吴静 许莉[3] 许高平 HU Yuying;WANG Xin;ZHANG Shihao;HU Fengping;WANG Chuqiao;WU Jing;XU Li;XU Gaoping(School of Civil Engineering and Architecture,East China Jiao Tong University,Nanchang 330013,China;School of Environment,Tsinghua University,Beijing 100084,China;Jiangxi Province Key Laboratory of Drinking Water Safety,Nanchang 330013,China)

机构地区：[1]华东交通大学土木建筑学院,南昌330013 [2]清华大学环境学院,北京100086 [3]江西省饮用水安全重点实验室,南昌330013

出　　处：《环境工程学报》2022年第6期1933-1943,共11页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金青年项目(51908214);江西省主要学科学术和技术带头人(20204BCJ23009);江西省科技创新基地计划(20192BCD40013);江西省自然科学基金(20212BAB214007);江西省研究生创新专项资金项目(YC2021-S411)。

摘　　要：高固厌氧消化(High solid anaerobic digestion,HSAD)在实际生产运行中,与传统厌氧消化相比,存在混合效果差、能量转换效率低等缺点。基于计算流体力学(Computational Fluid Dynamics,CFD)研究了不同桨叶角度的搅拌桨对生产规模反应器混合效率的影响。并根据不同工况下的能量转换效率和能量消耗,确定了最佳工况。结果表明,随着桨叶角度从30°增加到60°,径向和轴向混合均有明显改善,但在高转速下的改善效果不明显。考虑到实际工程应用,建议采用低转速和大桨叶角度。因此,建议反应器采用桨叶角度为60°的搅拌桨,转速为1 r·min^(-1)(净能量产出为0.023 GJ·d^(-1)·m^(-3))。本研究结果可为实际工程中HSAD反应器的混合策略提供参考。High solid anaerobic digestion(HSAD) has the shortcomings of poor mixing effect and low energy conversion efficiency compared to traditional anaerobic digestion in actual production operation.In this study,the effects of different blade angle impellers on mixing efficiency at full-scale were studied based on Computational Fluid Dynamics(CFD).Then,the optimal working conditions were revealed according to energy conversion and energy consumption.Results indicated that both radial and axial mixing were remarkably improved as blade angle increased from 30° to 60°,but improved gently at high rotating speed.Besides,considering energy generation in actual engineering applications,low rotating speed and large blade angle were recommended.Thus,the reactor with 60° blade angle impellers operating at 1 r·min^(-1) was recommended(with the net energy of 0.023 GJ·d^(-1)·m^(-3)).This study could provide a credible reference for mixing strategies of HSAD digester in practical engineering.

关 键 词：高固厌氧消化 计算流体力学 桨叶角度 混合策略 能量评估 

分 类 号：X713[环境科学与工程—环境工程]