【摘要】 本文介绍了对喷杯型喷射塔在大液气比条件下的流体力学状态的考察情况,以及其压降和传质数据关联方法的初步探讨。 本文指出,喷射塔的流体力学状态除了文献上已提到的脉动态和均匀连续态外,在大液气比条件下还存在着第三状态,即极度湍动乳化态。通过校核发现,现有的压降关联式不适用于第三状态。为此,作者在探讨各种关联方法的基础上,提出了该实验条件下的经验关联式。更多还原

【Abstract】 A cup-jet absorber is one of the high velocity co-current equipment of mass transfer. Research on this equipment in related literatures was only restricted to the operation conditions below the liquid-gas ratio m = 8 1/m3, while works on the liquid-gas ratio m=101/m3 have not been found yet in the periodicals. The present paper is dealing with the study of the foll wing two subjects:(1) Observation of the flow patterns in a cup-jet absorber;(2)Approach to the correlated method of the pressure drop and the mass transfer data of the cup-jet absorber under the high liquid-gas ratio.The experiments were undertaken on air-ammonia-water system under the conditions of liquid-gas ratio m= 4to30 l/m3 and gas velocity WG=10to50m/s at the bootom of the cup. We arrived at the following conclusions:(1) The operation regions of a cup-jet absorber were divided into three differant flow patterns. The first state is known as a pulsation state, the second as a homogeneous and continuous state, and the third as an extreme turblent state.( 2 ) We have presented the following empirical equations for a cup-jet absorber.In a dry column, if Re≤3.1×104, the pressure drop data for a cup-jet absorber are correlatedLa=8.95×10-1Re0.95 and if Re>3.14×104,La=1.168×10-1Re where La is the Lagranian number, and Re is the Reynolds number.In a wetted-cup column with the dimensionless group 0.06 andwhen , the flow state is of the second pattern,when , that is the third state,where the gas velocity at the bottom of the cup, m/s;the gas density, kg/m3;the gas viscosity, kg.s/m2;d0 -the diameter at the bottom of the cup, m.Besides, we have also found that the mass transfer data can be correlated by the following empirical equation;where, the overall gas mass transfer coefficient for a cup-jet in kg-mols/h.m3(unit molar concentration difference); NOG-the number of overall gas transfer units for a cup-jet.更多还原