摘要
填料塔以压降小、通量大、持液量小、分离效率高等优点广泛应用于精馏和吸收等单元操作中。填料塔中液体的流体力学行为对精馏等传质过程有重要影响,而液体在填料塔中的有效流速是液体流体力学行为的重要参数。例如描述填料塔中液相返混通常用一维或二维扩散模型,其中的有效流速就是重要的方程参数;要精确描述填料塔中相界面的传质行为,液相的真实流速也是关键性的参数。
The residence time distribution in a packed column containing Mellapak 250Y and Mellapak 350Y was measured by pulse tracer technique, and the liquid effective velocity was evaluated by optimization method. It was found that the liquid effective velocity is proportional to the cubic root of liquid flow rate. Two dimensionless numbers, Nv and Nw, were proposed to represent respectively the liquid effective velocity and the liquid flow rate. The experimental data were correlated satisfactorily by a dimensionless equation involving No and Nw. Comparison was made between the experimental data and the calculated results by the proposed equation, Bravo's method and the method from falling film theory.
出处
《化工学报》
EI
CAS
CSCD
北大核心
1997年第6期736-739,共4页
CIESC Journal
基金
国家自然科学基金资助项目(No.29676029)
关键词
填料塔
波纹板填料
液体有效流速
packed column, corrugated sheet packing, liquid effective velocity, diraensionless correlation
