Experiments were conducted in the high pressure distillation column containing corrugated structured packing of Mellapak 250Y under operating pressure from 0.3 MPa to 2 MPa, using n -butane and n -pentane mixture as t...Experiments were conducted in the high pressure distillation column containing corrugated structured packing of Mellapak 250Y under operating pressure from 0.3 MPa to 2 MPa, using n -butane and n -pentane mixture as the separating material. The height equivalent to a theoretical plate (HETP) was evaluated from the measured n -butane liquid concentration profile along the packing. After carefully analyzed, the HETP may be reasonably divided into two parts. The first part is the ideal height of mass transfer unit, which is caused by the mass transfer resistance between vapor and liquid. Another part is the height of backmixing unit (HBU), which is caused by the backmixing of vapor and liquid. The parameters of HBU correlation were evaluated by the experimental data. The present HETP correlation was used to predict the experimental results in literature, and well agreement was found between them.展开更多
The vapor phase passing through the flowing liquid on a distillation tray exerts a resisting force on the liquid phase and,at the same time,enhances liquid turbulence.Both of these effects should be considered in the ...The vapor phase passing through the flowing liquid on a distillation tray exerts a resisting force on the liquid phase and,at the same time,enhances liquid turbulence.Both of these effects should be considered in the modeling of the Liquid velocity field.A mathematical model considering both effects isdeveloped.The comparison of the computed results with experiments shows that the proposed model is more suitable for simulating the velocity field on distillation trays than existing model.展开更多
It has long been recognized that the flow pattern,especially the velocity distribution of the fluid,is of great importance in determining the performance of the equipment using structured packing as its internals.By u...It has long been recognized that the flow pattern,especially the velocity distribution of the fluid,is of great importance in determining the performance of the equipment using structured packing as its internals.By using three-dimensional laser Doppler velocimetry(LDV),the liquid velocity distribution of the glycerol aqueous solution was measured in a typical unit of structured packing(Mellapak 350Y).Time averaged three-dimensional velocity distributions of the unit were measured at different flow rates.The experimental data showed that the liquid velocity profile of the single phase flow was complex because of the special geometry of the unit of structured packing.In the central region of the unit,the liquid was mixed strongly and re-distributed.It was the main cause generating the vortexes and secondary flow.展开更多
利用专利文献数据识别技术领域的技术主题演化发展路径并分析其发展趋势,对于科技界、企业界进行专利技术创新具有重要的意义。首先,使用Open IE 5.1进行SAO(subject-action-object)三元组抽取,基于LDA(latent Dirichlet allocation)模...利用专利文献数据识别技术领域的技术主题演化发展路径并分析其发展趋势,对于科技界、企业界进行专利技术创新具有重要的意义。首先,使用Open IE 5.1进行SAO(subject-action-object)三元组抽取,基于LDA(latent Dirichlet allocation)模型进行主题识别,根据TRIZ技术创新思想,基于action语义词典将技术主题划分到四个维度;然后,通过计算SAO三元组之间的相似度来测度技术主题之间的语义关联构建技术主题创新演化路径,并利用可视化技术构建技术主题创新演化路径可视化图谱,利用该图谱辅助分析技术主题演化脉络及其发展趋势。最后,通过石墨烯超级电容器(集流体)领域的实证,对该领域的技术问题(problem to problem,P-P)主题、技术功能(solution to solution,S-S)主题、解决方案(problem to solution,P-S)主题和技术效果(solution to problem,S-P)主题的创新演化路径进行解读分析,验证了本研究提出方法的可行性和有效性。展开更多
Flow pattern or velocity distribution on a distillation tray is of great importance in determining tray efficiency. And design of distillation process is mainly rely on experimental data which also can be used in veri...Flow pattern or velocity distribution on a distillation tray is of great importance in determining tray efficiency. And design of distillation process is mainly rely on experimental data which also can be used in verification of mathematical model for describing the flow pattern on a tray.In this paper,hot-film anemometer with X-type probe is applied to the measurement of gas-liquid two-phase flow on a sieve tray.First,a calibration method that used in this paper is proposed and a computational model for data processing is presented.Then the threshold method used to separate vapor signals from those of the liquid is described.Finally,typical measuring results,which include the magnitude and direction of local velocity,and the distribution of turbulent kinetic energy,are presented.展开更多
文摘Experiments were conducted in the high pressure distillation column containing corrugated structured packing of Mellapak 250Y under operating pressure from 0.3 MPa to 2 MPa, using n -butane and n -pentane mixture as the separating material. The height equivalent to a theoretical plate (HETP) was evaluated from the measured n -butane liquid concentration profile along the packing. After carefully analyzed, the HETP may be reasonably divided into two parts. The first part is the ideal height of mass transfer unit, which is caused by the mass transfer resistance between vapor and liquid. Another part is the height of backmixing unit (HBU), which is caused by the backmixing of vapor and liquid. The parameters of HBU correlation were evaluated by the experimental data. The present HETP correlation was used to predict the experimental results in literature, and well agreement was found between them.
文摘The vapor phase passing through the flowing liquid on a distillation tray exerts a resisting force on the liquid phase and,at the same time,enhances liquid turbulence.Both of these effects should be considered in the modeling of the Liquid velocity field.A mathematical model considering both effects isdeveloped.The comparison of the computed results with experiments shows that the proposed model is more suitable for simulating the velocity field on distillation trays than existing model.
文摘It has long been recognized that the flow pattern,especially the velocity distribution of the fluid,is of great importance in determining the performance of the equipment using structured packing as its internals.By using three-dimensional laser Doppler velocimetry(LDV),the liquid velocity distribution of the glycerol aqueous solution was measured in a typical unit of structured packing(Mellapak 350Y).Time averaged three-dimensional velocity distributions of the unit were measured at different flow rates.The experimental data showed that the liquid velocity profile of the single phase flow was complex because of the special geometry of the unit of structured packing.In the central region of the unit,the liquid was mixed strongly and re-distributed.It was the main cause generating the vortexes and secondary flow.
文摘利用专利文献数据识别技术领域的技术主题演化发展路径并分析其发展趋势,对于科技界、企业界进行专利技术创新具有重要的意义。首先,使用Open IE 5.1进行SAO(subject-action-object)三元组抽取,基于LDA(latent Dirichlet allocation)模型进行主题识别,根据TRIZ技术创新思想,基于action语义词典将技术主题划分到四个维度;然后,通过计算SAO三元组之间的相似度来测度技术主题之间的语义关联构建技术主题创新演化路径,并利用可视化技术构建技术主题创新演化路径可视化图谱,利用该图谱辅助分析技术主题演化脉络及其发展趋势。最后,通过石墨烯超级电容器(集流体)领域的实证,对该领域的技术问题(problem to problem,P-P)主题、技术功能(solution to solution,S-S)主题、解决方案(problem to solution,P-S)主题和技术效果(solution to problem,S-P)主题的创新演化路径进行解读分析,验证了本研究提出方法的可行性和有效性。
文摘Flow pattern or velocity distribution on a distillation tray is of great importance in determining tray efficiency. And design of distillation process is mainly rely on experimental data which also can be used in verification of mathematical model for describing the flow pattern on a tray.In this paper,hot-film anemometer with X-type probe is applied to the measurement of gas-liquid two-phase flow on a sieve tray.First,a calibration method that used in this paper is proposed and a computational model for data processing is presented.Then the threshold method used to separate vapor signals from those of the liquid is described.Finally,typical measuring results,which include the magnitude and direction of local velocity,and the distribution of turbulent kinetic energy,are presented.
