Dissertation > Industrial Technology > Chemical Industry > General issues > Chemical processes ( physical processes and physical and chemical processes ) > Basic theory

Hanging downcomer from the liquid seal

Author LiYuMin
Tutor YuXiaoMei
School Zhejiang University of Technology
Course Chemical Engineering
Keywords Hanging downcomer Self-styled line Self-sealing mechanism
Type Master's thesis
Year 2001
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Hanging downcomer tray requires downcomer from the liquid seal to prevent gas leakage into the downcomer, to lower tray efficiency . Therefore , in the performance diagram on the tray to add a self-styled line . Designed for use with a self-sealing line in the past or are too rough, or substantially not downcomer leak as standard to be too conservative , reducing the stability of the operating area of the trays , they are to some extent limit the design of the trays . This paper aims to adopt a new standard of self-styled the experimental new line of self-styled self-styled line neither reduce tray efficiency can expand the stability of the operating area of the tray . Experiments in the 300 × 200 mm transparent plexiglass rectangular column , the air - water system, leak the number of times within a unit time is 1 time / second puncture standard measured puncture line , and by the factorial experiment to determine the liquid orifice area and the gas-liquid density self-styled line . Establish leakage model , deduced leak plate efficiency ; calculated leakage of the self-styled standard plate efficiency declined by about 0.0262% to 0.0728% , can say no to affect the plate efficiency . Order from the self-styled mechanism (ie, self-styled hydrodynamic performance) illustrate the problem , this paper theoretically discusses the fluctuation mechanism and leak mechanism , and a certain degree of validation experiments . The article also determined through experiments the the flow bore hole flow coefficient and liquid flow hole liquid holdup . Experimental results show that : the new self-styled line better than the self-styled line . When the ratio of the density of the gas-liquid (ρ_G / ρ_L) increases puncture required the flow resistance h_d required to increase correspondingly.

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