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Study on Hydraulic Performance of New Valve Tray

Author: ZuoMeiLan
Tutor: XiangShuGuang
School: Qingdao University of Science and Technology
Course: Chemical Engineering
Keywords: new floating valve hydraulics load capablity diagram pressure drop of ray entrainment weeping
CLC: TQ053.5
Type: Master's thesis
Year: 2009
Downloads: 100
Quote: 2
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Abstract


Tray column is a type of important gas-liquid contact equipment in the chemical industry, in the recent years, the novel tray appears frequently and has various kinds of structures.In order to observe the rationality of structures and the availability of the trays in the process,this paper chose two well-structured floating valve trays.one was trapezoidal directed valve tray,the other was gradient ringent trapezoidal valve tray.Research on hydraulic performace of new valve trays was carried out with load capability diagram of tray in the paper.The hydraulic performance was investigated based on index of plate pressure-drop, entrainment,weeping. The correlation of plate pressure-drop, entrainment ,weeping with weir height,liquid flow intensity and the valve hole F-factor(kinetic energy factor) were obtained using least square method.The datas used came from industry and experiment which ensured hydraulic models of trapezoidal directed valve tray and gradient ringent trapezoidal valve tray were correct.The hydraulic behavior of trapezoidal directed valve tray and gradient ringent trapezoidal valve tray were compared with F1 floating tray using benzene-toluene system.The results indicated that the hydraulics of new valve trays with opening rate 9.8% were better than F1 tray with opening rate 25.6%. At the same operating conditions,operation flexibility of trapezoidal directed valve tray and gradient ringent trapezoidal valve tray were more excellent than that of F1 floating valve, both entrainment and weeping were lower than that of F1 floating valve.There was serious weeping problem in de-low-boilingsubstances tower of chloroethylene plant of chlor-alkali complex.The trapezoidal directed valve tray and gradient ringent trapezoidal valve tray of better hydraulic performance were chosed to reconstruct the old plates. The results showed that liquid leakage of tower was completely eliminated,the state of operation was improved and processing capacity was great increased .The research provided important theoretical evidence for new trays in industrial application.

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CLC: > Industrial Technology > Chemical Industry > General issues > Chemical machinery and apparatus, equipment > Chemical general machinery and equipment > Tower chemical equipment
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