摘要
用空气 -水体系 ,表观气速在 0～ 0 .1 1m/s范围内 ,上升管内径为 0 .0 9m、下降管内径为 0 .0 5m、高为 1 .2m的外环流反应器 ,对上升管、下降管和气液分离箱的体积传质系数、气含率与循环液速进行了实验研究。体积传质系数用物理法测定 ,数据用矩分析法处理 ;气含率采用静压差法测量 ;循环液速采用脉冲示踪技术测定。结果表明 ,表观气速小于 0 .0 8m/s时 ,上升管和下降管的体积传质系数随表观气速上升较快 ,且较分离箱的体积传质系数高出近 40 % ,而当表观气速大于 0 .0 8m/s时 ,下降管和气液分离箱的体积传质系数出现极值而后下降。表观气速在 0～ 0 .0 87m/s内 ,进一步测定了气含率与循环液速随表观气速增加而变化的规律 ,得出气含率与循环液速随表观气速的增加而增加的结论。将体积传质系数、气含率和循环液速与表观气速的数据按幂函数关联后 。
The volumetric mass transfer coefficients, the gas holdup and the liquid circulation velocity of the different part of the reactor with 0.09 m riser's diameter, 0.05 m downcomer's diameter and height of 1.2 m were experimentally investigated for the superficial gas velocity between 0～0.11 m/s for air-water system. The mass transfer coefficient was measured by the physical method, its data processed with the moment analysis method, the gas holdup determined by the static pressure difference method and the liquid circulation velocity measured by the pulse tracer technique. The result indicats that the mass transfer coefficients of the riser and downcomer increase quickly when the superficial gas velocity is less than 0.08 m/s and are about 40% higher than that of separator. However, when the superficial gas velocity is more than 0.08 m/s, they decrease after the peak. The gas holdup and the liquid circulation velocity are also studied in the superficial gas velocity of 0～0.087 m/s, by which its changing regular pattern following with superficial gas velocity is obtained. They are all increased quickly with the superficial gas velocity. The correlation equation of the volumetric mass transfer coefficients, the gas holdup, the liquid circulation velocity and the superficial gas velocity conformed well to the experimental data according to power function.
出处
《石油化工高等学校学报》
CAS
2002年第3期9-11,15,共4页
Journal of Petrochemical Universities
基金
辽宁省自然科学基金项目 (972 0 50 )
关键词
外环流反应器
体积传质系数
循环液速
气含率
External loop reactor
Volumetric mass transfer coefficients
Liquid circulation velocity
Gas holdup
