| Iron-based ionic liquid desulfurization is a green and environmentally friendly desulfurization technology without secondary pollution.The regeneration of the desulfurization rich liquid is an important part of the iron-based ionic liquid desulfurization process.If the regeneration efficiency cannot keep up with the desulfurization efficiency,the overall desulfurization efficiency will be reduced,the excellent effect of the desulfurization liquid cannot be fully exerted,and the normal operation of the entire desulfurization process will be affected.In this paper,the dynamic wave is used as the regeneration device of the desulfurized rich liquid,and the regeneration experiment of the desulfurized rich liquid is carried out by air by using the characteristics of high mass transfer efficiency and small pressure drop in the foam zone.At the same time,the effects of the jet angle and liquid viscosity of the nozzle in the dynamic wave on its hydrodynamic performance and mass transfer characteristics were also studied.The main conclusions are as follows:（1）The gas-liquid contact states in the dynamic wave are mainly divided into four types:liquid column,dispersed state,transition state and stable foam state,and the respective gas-liquid boundary ranges are given in the form of gas-liquid load performance diagrams.The nozzle spray angle and the liquid viscosity have a great influence on u L,initial（the initial liquid injection velocity that can form a stable foam）.In liquid phase 1#,the spray angle of the nozzle changed from 15 degrees to 30 degrees,and the u L,initial decreased from 20.11m·s-1 to 9.14 m·s-1.In nozzle 2#,the liquid viscosity changed from 1 m Pa·s to30 m Pa·s,and the u L,initial increased from 9.14 m·s-1 to 25.41 m·s-1.Under the experimental conditions,the pressure drops in the stable foam-like region are below 2000 Pa.According to the experimental data,a multiple linear regression is performed to fit the pressure drop correlation of the stable foam-like region under the condition of nozzle 2#:Δ=2.872×10（）（0）/0))...Comparing the calculated value of the correlation formula with the experimental value,the error does not exceed 15%,and it has a good degree of fit.（2）The mass transfer characteristics in the dynamic wave were analyzed from the two aspects of mass transfer efficiency and mass transfer coefficient through O2 desorption experiments.The effect of mass transfer efficiency and mass transfer coefficient with superficial gas velocity and liquid injection velocity is obviously different with u L,initial as the boundary.The increase of the liquid viscosity will increase the u L,initial obviously,resulting in a significant decrease in the mass transfer efficiency under the liquid jet flow rate at u L,initial.From the distribution of mass transfer coefficients of liquid phase 1#and liquid phase 2#in different gas-liquid contact states,it can be found that the increase of liquid phase viscosity has relatively little effect on the mass transfer coefficient of stable foamy gas-liquid contact state,while other The influence of the gas-liquid contact state is greater.（3）The regeneration experiment of desulfurization rich liquid in dynamic wave shows that when the gas-liquid contact state is in a stable foam state with a small gas flow,the regeneration efficiency is obviously better than that in the transition state with a large gas flow.The best operating conditions for desulfurization efficiency in this device are q L=1.55 m3·h-1,q G=11.55 m3·h-1,and the regeneration efficiency of 4 L of desulfurization rich liquid can reach90%in only 120 min.In the regeneration process,the presence of a small amount of water in the desulfurization rich liquid is beneficial to the regeneration process.The detection of the active species·OH during the gas-liquid mixing process in the dynamic wave combined with the comparison of the infrared spectra before and after the regeneration of the desulfurization rich liquid shows that in the process of using the dynamic wave device to regenerate the desulfurized rich liquid,the desulfurization liquid will not be degraded due to the gas-liquid contact form formed by the gas-liquid collision. |
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