Study On The Distribution Of Droplet And Liquid-Film In Cross-current High-gravity Rotating Packed Bed Equipped With Dishes

This paper first introduced the super-gravity field, the revolving super-gravity bed reactor and their newest application in the environmental protection industry and the biochemistry industry, and then summarized the domestic and foreign newest research progress. The revolving super-gravity bed reactor is one of the effective technologies to scrub the main greenhouse gas CO₂ from flue gas. In the dishing rotating super-gravity bed reactor, distribution rule of liquid-drop and liquid-film affects the specific gas-liquid interfacial area and gas absorption rate. Therefore, distribution rule of liquid-drop and liquid-film in dishing rotating high-gravity bed reactor is studied in this paper.The mathematical model about the liquid-drop distribution and the liquid-film thickness in disking rotating super-gravity bed reactor were founded by theoretical analysis and condition simplified. This mathematical model comprehensively inspects the effect of craft operation parameters such as liquid flux, gas flue, dish rotate speed and super-gravity bed structure parameters such as disk interval and disk cavity rate on liquid-drop distribution and liquid-film thickness.The result indicated that increasing rotational speed can enhance ratio of liquid-drop efficiently, because enhancing rotational speed will augment centrifugal force which accelerates the bursting of liquid-film, and the ratio of liquid-drop will decline when the liquid flow increased under the same technological conditions, so it must increase the centrifugal force to increase liquid atomization. The result also indicated that the ratio of liquid-drop will be improved when inlet gas flux increased, because there is more airflow to blow off liquid-film in this condition.Increasing disk interval will promote the atomization of liquid, decrease once more gather of liquid-drop and increase the specific gas-liquid interfacial area. However, when disk interval is too large, the space volume of reactor will be augmented accordingly and the number of liquid-drop per unit volume will be decreased which affects the reaction rate. Increasing the number of holes in each disk will also promote the atomization of liquid, because when the number of holes in each disk is high, the gas resistance is small and the flux is large, which can split the liquid-film of disk surface effectively. However, when the number of holes in each disk is too large, the mechanical strength of disk will reduce and the gas can be also easy to have short circuit phenomenon.Under this experimental specific condition, when the rotational speed is 1000r/min, the optimum liquid flow is 0.6m³/h, the optimum gas flow is 1.4m³/h, the optimum disk interval is about 12mm, the optimum number of holes in each disk is 96 (Φ12mm).Actual value and model predicted value have certain degree deviation, and the liquid-drop once more gathers phenomenon as well as resistance loss question of fluid in transmission process must further be considered. However this aspect functional relation is extremely complex and the value solves troubles extremely. Therefore this condition is neglected and is attributed approximately.Change tendency of experimental value and theoretical predicted value is basic consistent in this paper, which might provide the theory basis for the next industrial development.