| It's common to use equilibrium stage method to calculate the height of chemical exchange unit in the boron isotopes separation system. For further consideration, the chemical exchange unit consists of absorption, chemical reaction and desorption. It's not valid to simply consider the reaction. We try to use the nonequilibrium stage method to predict the tower height. In order to improve the pertinence of this method, some experiments have been done to get the related performance of the ? ring random packing presently used in the chemical exchange unit.We use five systems with different liquid viscosity and surface tension including N2-Deionized water, N2-5.2wt% ethylene glycol, N2-12wt% ethylene glycol, N2-50ppm SLS, N2-110m SLS to test the fluid mechanics properties of the ? ring random packing. We analyze the effect of different liquid viscosity and surface tension on the pressure drop.In addition, we work out the correlations between pressure drop and gas kinetic factor, that is Z/?P= 13.67×F1.66. We also calculate the correlations between the total liquid holdup and Fr number, that is Ht= 1.27· FrL0.31.We use five systems with different liquid viscosity and surface tension including CO2-Deionized water, CO2-5.2wt% ethylene glycol, CO2-12wt% ethylene glycol, CO2-50ppm SLS, CO2-110m SLS to test the mass transfer performance of the ? ring random packing. We analyze the effect of different liquid viscosity and surface tension on the mass transfer performance. In addition, we find out the correlations between liquid volumetric mass transfer coefficient and the major criterions, that isKLa= 359.927· (?/d??)0.712·(?D/?)0.5 ·d/D. We put it into the practice of the boron isotopes separation system and get the value of KLa.Finally, we introduce the reaction mass transfer enhancement factor E. According to the experiment data, we get the value of E reversely and the correlation of tower height. We use the method of the nonequilibrium stage to predict the tower height is 543 meters. |
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