Research Of The Liquid Calandria Splitter Of Continuous Type In DWC Column Based On Fractal Theory

In chemical production,distillation technology is used widely in the separation of multi-component mixture materials.As a new type of distillation equipment,the dividing wall column(DWC) has attracted the attention and research of experts and scholars because of its advantages such as low energy consumption,high separation efficiency,and small footprint.The DWC technology is an extension of the development of fully thermally coupled distillation column technology.It is difficult to distribut the gas and liquid the tower for the complicated internal structure of the DWC,which is the main reason for the slow acceptance of the DWC in process industry.As an important adjustment parameter of the DWC,The liquid split ratio has a significant impact on the product concentration and energy consumption.The liquid split of the DWC has become one of the hot spots in the research of energy saving technology.Based on the fractal theory,the liquid calandria splitter of continuous type in DWC column that can be designed.The device was theoretically calculated,experimentally studied and numerically simulated on the six different inlet flow conditions about 0.1,0.3,0.6,1.0,1.5,2.5m~3/h.According to the simplified revisions momentum equation,the piercing pressure and piercing velocity were calculated with the flow rate of Q=0.6m~3/h.In the experimental determination,the method of Klemas distribution quality assessment and L.Spiegel distribution quality assessment and liquid nonuniformity were carried out under different inlet flow rate conditions.A comparative study was implemented about the valve structure of A and B.The numerical analysis on different inlet flow conditions and different valve deflection anglesθwere completed by the computational fluid dynamics software FLUENT with k-εturbulence model and the finite volume method.The results shown that the liquid distribution device can effectively sparate and evenly distribute the liquid,and the piercing pressure and piercing velocity are relatively stable.The distribution quality of Klemas and L.Spiegel is good,and the distribution nonuniformity of the liquid is smaller.At the same time,B-type valve is better than A-type valve on distribution.Experiment results and simulation results were in a good agreement,which indicated that the reliability of numerical simulation for research of the device.With the gradual increase of the deflection angleθof the valve plate,the pressure and flow velocity of the liquid distribution device at y=0 cross section change.When the deflection angle of the valve changes from 0° to 50°,the liquid split ratio changes significantly,and the piercing pressure and piercing velocity of the liquid also gradually bigger;when the range ofθis 50°～90°,the liquid split ratio tends to change slowly so that the adjustment sensitivity go down slightly.The research of the device shown that the design of the liquid calandria splitter of continuous type in DWC column meet the design requirements.