摘要
针对一种气液逆流接触洗涤器,通过冷模实验,采用溶氧法和压力传感器考察了洗涤器内黏度对气液传质和流动特性的影响。结果表明,黏度对传质的影响并非单调递增或递减的趋势,中间黏度洗涤液下的解析率最高。此外,洗涤器内除了泡沫型(Q_A/Q_T=0.4~0.6),环流型(Q_A/Q_T=1.2~1.5)也表现出了良好的传质效果。当洗涤液黏度n=1.00~1.30mm2/s时,压力在不同轴切比下的变化趋势与相同液量下解析率的变化相似,即传质较佳的流型对应的压力值也高。根据实验结果,将流动参数、传质参数、操作参数结合在一起,给出了解析率和压降的经验关联式,计算值与实验值吻合较好,可供工程设计参考。
A countercurrent scrubber was studied to investigate the effects of liquid viscosities on the gas-liquid mass transfer characteristics and flow behavior through cold model experiments by using the dissolved oxygen technique and pressure sensors.The results showed that the effect of viscosity on mass transfer was not merely monotonically increasing or decreasing.However,desorption rates under the condition of median viscosity of the washing liquid presented maximum.Within the investigated viscosity range,the increase of the viscosity(n=1.15 mm^2/s) led to the instability of the gas-liquid interface and promoted its surface renewal,which made the turbulence of gas and liquid intensely.When the liquid viscosity(n=1.30 mm^2/s) continued to increase,the viscous dissipation effect could not be neglected and then the deformation ability of droplets was weak and not easy to break up,so the performance of mass transfer was poor.At the same time,in addition to the foam flow pattern(Q_A/Q_T=0.4~0.6) in the scrubber,the annular flow pattern(Q_A/Q_T=1.2~1.5) also showed quite desirable mass transfer performance.Furthermore,when the liquid kinematic viscosity n=1.00~1.30 mm^2/s,the variation tendency of the pressure under different axial-tangential volume flow ratios was similar to the change of the desorption rates under the same liquid flow rate.A flow pattern for good mass transfer also closely related to a high-pressure value.Based on the experimental results,the empirical correlations both for the desorption rate and the pressure drop were given combining with the parameters of flow behavior,mass transfer and operation.The calculated and the measured results agreed well respectively,which can be used for engineering design purpose.
作者
郝思佳
范怡平
汪泉宇
赵亚飞
Sijia HAO;Yiping FAN;Quanyu WANG;Yafei ZHAO(State Key Laboratory of Heavy Oil,China University of Petroleum(Beijing),Beijing 102249,China;CNOOC Gas&Power Group Co.,Ltd.,Beijing 100028,China)
出处
《过程工程学报》
CAS
CSCD
北大核心
2020年第4期390-399,共10页
The Chinese Journal of Process Engineering
基金
国家自然科学基金资助项目(编号:21476254)。
关键词
气液两相流
洗涤器
黏度
传质
流动特性
gas-liquid flow
scrubber
viscosity
mass transfer
flow behavior
