Effect Of Inner Packing Supporter On Gas-Film Controlled Mass Transfer In Rotating Packed Bed

Rotating Packed Bed (RPB) is a new type of mass transfer equipment. It may significantly strengthen the process of mass, momentum and heat transfer , and have the characteristics of very high rate of mass transfer and throughput. Besides, it also has the advantages of shorter residence time than that of other reactors, and may greatly intensify micromixing. In practice, the inner support in PRB is to fix packing in rotor. When packing is incompact webby or dumped packing, inner support becomes an essential part of PRB in order to avoid remove and anamorphosis of packing. And it will certainly have strong influence to mass transfer of PRB. So far, nobody has done monographic study of Gas-film controlled mass transfer when inner support has been installed in packing. In addition, if the influence of inner support in RPB on mass transfer be mastered, it can further offer foundation of theory for industrialization of RPB. Hence, it is significant to study the effect of inner packing support on Gas-film controlled mass transfer in RPB.The working system of the experiment is absorption of NH3 in air by water, which is the typical process of 1 gas side controlled mass transfer.In the scope of experiment, the results and conclusions are as following:1. Packing inner support induces mostly negative effect on Kya.e in RPB. In the range 45-100% of support free area, Kya.e decreases with the decrease of support free area.2. The radial location of the inner support has no apparently effect on Kya.e.3. Whether there is packing inner support in RPB or not, rotating speed and gas flow rate have remarkable effect on volumetric mass transfer coefficient, while liquid flow rate has minor effect.4. At the different rotating speeds, Kya.e distinctly increase with the increase of gas flow rate and decreases slightly with the increase of liquid flow rate.5. Within the range 50 - 400 rpm of rotating speed, Kya.e speedily increases with the increase of rotating speed. The increasing becomes slower andslower when rotating speed is beyond 400 rpm (the centrifugal acceleration is 18.8 g at inner radius and 31.3 g at outer radius of the rotor at 400 rpm). 6. G/L has significant effect on Kya.e. The greater G/L is, the greater Kya.e is. This effect is more distinct when rotating speed gets higher.Through methods of dimensional analysis, the correlation function of coefficient of mass transfer is gained.Where: C=1329, C2=-0.1519, C3=0.2126, C4=0.3514, C5=-0.3842, C6=0.1004Furthermore, test of F or T statistics testify that coefflcent of gas controlled mass transfer may be token through this correlation function.