| TH-VST is a new tray with a good flow distribution performance whichcombines the merits of guided trapezoid valve tray and the NVST tray. The NVSTtray only consider the pressure drop, entrainment and weeping in the designing anddevelopment process. The clear liquid height distribution on VST had little studies inrecent years which was an important parameter in hydrodynamic field. Therefore, thisstudy was focused on the performance of clear liquid height distribution. The resultscan be applied in the engineering design.In this paper, four kinds of TH-VST and one kind of RH-VST were studied in the1500mm×400mm quadrate column with air-water system. The hydrodynamicperformances including tray pressure drop, clear liquid height and non-uniform degree,was obtained under the various operation parameters(F0–factor, weir height and liquidweir load). At last, this paper proposed the corresponding correlation equation onbasis of the experimental data. The results showed that TH-VST has a better flowdistribution performance. Meanwhile, TH-VST is higher than RH-VST in dry pressdrop, wet press drop and clear liquid height at the same condition. the non-uniformdegree decreased and then increased with increase of the angle of trapezoidal hole. Atlast, the best angle range of trapezoidal hole is4°~8°.On the base of VOF and realizable k-model, the gas and liquid phase flow fieldwas simulated in CFD model. The clear liquid height was selected to verify theaccuracy of this model by the comparison of experimental and simulated data. Thesimulated results perform well and get the regularities of distribution of the gas andliquid phase flow field. The RH-VST and TH-VST have liquid flow dead zone behindtheir cap. RH-VST exists a serious circumfluence and vortex near the bottom gap offirst and mid cap, and uneven distribution of gas-liquid lifting velocity among all thecap. However, TH-VST performs well in flow distribution and gas-liquid liftingvelocity aspect. |
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