Research And Development Of 3D Printing New Type Packing For Rotating Packed Bed

With the development of high gravity technology,different Rotating Packed Bed structure has emerged according to the need of various functions.As the core component of core components,packing has a decisive effect on gas-liquid mass transfer and hydrodynamic performance.Liquid is shear and coalescence repeatedly into small droplets,liquid filament,liquid film by high speed rotating packing,turbulent degree is increased,contacting area and surface renewal rate are greatly enhanced,fluid film thickness and liquid mass transfer resistance is decreased effectively,mass transfer process is intensified.However,the fine structure of packing can not be constructed because of limitation of the original technology.Combined advantages of wire mesh packing and low pressure drop packing,the fine packing structure was constructed by 3D modeling and 3D printing technology,analyzing the intensification mechanism of packing of Rotating Packed bed.Based on the advantages of,better liquid dispersion effect,high porosity and large specific surface area,regular gas,liquid channel was built,so that 3D printing new packing not only has uniform distribution of gas,liquid channel,large effective specific surface area and better dynamic balance,but also has the advantages of high mass transfer efficiency,low gas pressure drop,large flux and convenient installation and maintenance.Effects of high gravity factor??14⁸6??empty bed gas velocity u?0.8² m/s??spray density q?2.6⁸ m3·m-2·h-1?on gas phase pressure drop of 3D printing new packing bed,wreath of plastic packing bed and wire mesh packing bed were investigated by air-water system.Compared with the phase pressure drop of wreath of plastic packing bed,wire mesh packing,3D printing new packing bed showed the optimum pressure drop performance.The pressure drop of 3D printing new packing is 47.5%lower than that of wire mesh packing,and44.8%lower than that of wreath of plastic packing bed.Compared with references,the phase pressure drop 3D printing new packing bed significantly lower than that of plastic pall ring packing bed.The results showed that the regular gas channel of 3D printing new packing could effectively guide gas and decrease phase pressure drop.The mass transfer performance of 3D printing new packing bed,wreath of plastic packing bed and wire mesh packing bed was investigated by SO₂–NaOH gas film control system.Effects of high gravity factor??14⁸6??empty bed gas velocity u?0.8² m/s??spray density q(2.6⁸ m³·m^-2·h^-1)on gas volumetric mass transfer coefficient kyae were studied.Compared with k_ya_e of wreath of plastic packing bed,wire mesh packing,3D printing new packing bed showed the better mass transfer performance,the value of k_ya_e is 26.1%higher than that of wreath of plastic packing bed,and 2.5%lower than that of wire mesh packing.Influence laws of??u and q on k_ya_e of 3D printing new packing was similar with that of wire mesh packing.The results indicated that the gas disturbance structure of 3D printing new packing bed can effectively perturb gas,and the wire mesh structure can fully atomize liquid,increase gas-liquid interfacial area,so that better mass transfer performance is performed.Compared with references,number of k_ya_e of 3D printing new packing bed was similar with CAS-RPB.The experimental results indicated that the 3D printing new packing bed has the advantages of large handing capacity,small pressure drop,low power consumption.It has great application potential in strengthening gas film control.Compared the pressure drop and mass transfer performance of 3D printing new packing bed with references,3D printing new packing bed can effectively decrease phase pressure drop and enhance mass transfer.The research results will provide guidance to packing development.3D modeling and 3D printing technology provide new method to the design and improvement of packing of Rotating Packed Bed.