摘要
针对化学反应过程中气液多相流体的分布问题,以尿素与1,2-丙二醇醇解法合成碳酸丙烯酯反应体系为研究对象,利用欧拉-欧拉双流体模型模拟计算了反应过程中气液多相流体的分布,采用能量最小化原理构建多尺度的双气泡气液相间(DBS)曳力计算模型,并对比了DBS曳力模型与传统Schiller-Naumann曳力模型及Grace曳力模型的计算结果。实验结果表明,基于均匀分布假设的传统曳力模型低估了气液相间曳力,导致反应器搅拌区域的气含率较低,而DBS曳力模型能够准确预估不同转速下的气含率,可模拟出工业化生产状况。
In order to solve the problem of gas-liquid multiphase flow distribution in chemical reaction process,taking urea and propylene glycol alcoholysis to synthesize propylene carbonate as the research object,the Eulerian-Eulerian two fluid model was used to simulate and calculate the gas-liquid multiphase flow distribution in the reaction process,and a multi-scale dual-bubblesize(DBS)gas-liquid drag calculation model was established by using energy minimization principle.The differences between DBS model and traditional Schiller-Naumann model and Grace model are compared.The results show that the traditional drag model based on the assumption of uniform distribution underestimates the drag between gas and liquid,resulting in low gas holdup in the stirred zone of the reactor.The DBS drag model can accurately predict the gas holdup distribution at different revolution speeds and simulate the industrial production.
作者
王世威
郝振华
王峰
赵宁
肖福魁
范素兵
Wang Shiwei;Hao Zhenhua;Wang Feng;Zhao Ning;Xiao Fukui;Fan Subing(State Key Laboratory of Coal Conversion,Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan Shanxi 030001,China;College of Chemistry Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering,School of Chemical Engineering,Ningxia University,Yinchuan Ningxia 750000,China)
出处
《石油化工》
CAS
CSCD
北大核心
2021年第4期300-306,共7页
Petrochemical Technology
基金
山西省自然基金面上项目(201801D121070)
国家自然科学基金面上项目(21776294)
山西省重点研发计划项目(201903-D421083,201903D121018)
国家自然科学基金国际(地区)合作与交流项目(22011530069)
宁夏大学省部共建高效利用与绿色化工国家重点实验室开放基金项目(2018-K11)。
关键词
碳酸丙烯酯
搅拌釜
气液多相流
双气泡曳力模型
计算流体力学
propylene carbonate
stirred tank
gas liquid multiphase flow
dual-bubble-size drag model
computational fluid dynamics
