Study On Separation Technology Of High Efficiency Internal Heat Integrated Distillation Column

The distillation technology is widely used in various industries of chemical engineering,medicine,and fine chemical,which has high investment and energy consumption.Ordinary distillation columns have a loss of effective energy due to the driving forces of large mass and heat transfer in the column,the irreversibility of the separation process caused by the concentration,temperature and pressure differences in the distillation process leads to low thermodynamic efficiency.In order to improve the rectification efficiency,reduce the consumption of utility engineering,and realize the sustainable use of energy,the chemical industries seek to improve the energy saving from the single tower structure to the entire factory chain.The heat integrated distillation column(HIDiC)technology is valued for its outstanding energy saving advantages,as the coupling of non-adiabatic distillation and heat pump distillation,the energy saving potential is huge.The research is of great significance to the development of chinese chemical industries.Based on the heat integrated distillation column technology,this paper designs and studies the new structure of HIDiC.Based on the theory of HIDiC and the results of Aspen simulation,a new type of HIDiC structure is established.Considering the dual effect of the model under temperature and pressure,the Solid Works software is used to analyze the static stress of the new tower section,and the structure of the composite HIDiC tower section was simulated by CFD in order to explore the hydraulic properties under different parameters,and optimize the structure of the new type of composite tower section,and analyze the difference of gas-liquid mass transfer between the sieve and bubble structure on the HIDiC tray.The results showed that the total annual running cost of the new HIDiC could be reduced to 26.6%compared with conventional distillation under the same feed,working conditions and separation effect;Reducing the height of outlet weir is conducive to improving the effect of mass transfer and heat transfer for the sieve composite tower section.In this paper,HIDiC theory,model construction and hydraulic simulation verify each other,and the HIDiC theory of plate to plate heat transfer is perfectly combined with the actual model.Through the cold model test,the hydraulic performance of the new HIDiC coupling structure is further verified.The whole research shows that the new HIDiC has obvious advantages in heat transfer,mass transfer,separation performance and internal structure compared with the traditional distillation column.It is expected that with the further enlargement this structure will reach the industrialization goal.