摘要
旋流塔板有复杂的气液接触状态。对应于一定的气液接触现象,气液接触状态可分为倾泻区、泡花区、喷射区和全喷射区。在四种接触状态下,塔板有效压降与气速的关系有明显的差别。以有效压降随气速变化规律的转化点作为气液接触状态的转化点,确定了塔板上各种气液接触状态的区域,并关联了接触状态转化点的操作条件。对喷射区有效压降的分析得到,有效压降主要决定于塔板上液体产生的静压降,气体径向速度可以忽略,而使喷射区内有效压降不受气速影响。全喷射区内,气速影响溢流管和溢流锥的溢流能力,而使气速明显地影响塔板有效压降。泡花区内,漏液量随气速的增大而减小;因此,气速影响塔板有效压降。适当地简化流况,提出了有效压降关联式,利用实验数据确定了其中的参数。
Gas-Liquid flow on Rotating stream tray appears a complicated picture. In the order of increasing gas velocity, the gas liquid flow on the tray distinguished into four regions, namely dumping, froth, spray and fully spray. The behaviour of these four regions and the transition from region to region are well characterized and correlated by effective pressure drop versus hole gas velocity curve. In spray region, the effective pressure drop is mainly dependent on the static pressure drop due to liquid holdup on the tray, its value is not affected by hole gas velocity. In fully spray region, gas flow affects the liquid overflow capacity in the downcomer or conical over flow device, hence affects the pressure drop significantly. In the froth region, when the gas velocity increases, the liquid weeping decreases, and the liquid-holdup on the tray increases, thus the gas velocity affects the presure drop. The correlation equations for prediction of effective pressure drop were also presented in the paper.
出处
《高校化学工程学报》
EI
CAS
CSCD
1990年第1期39-49,共11页
Journal of Chemical Engineering of Chinese Universities
