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  • 水洗塔塔板改造总结

    与多喷嘴对置式水煤浆气化装置配套的水洗塔经常出现气体带水和压差大的问题。通过3次改造,以3个工作区域的构想,将水洗塔设计为舌形是为了使用低塔板+带导向的固阀塔板+泡罩塔板的结构,成功地降低了水洗塔压差,解决了气体带水的问题。...

    2020-09-13 23:35:02浏览:42 水洗塔带水塔板改造压差waterscrubberentrainmenttrayrevampingpressure

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  • Physical modelling and scale effects of air-water flows on stepped spillways

    During the last three decades, the introduction of new construction materials (e.g. RCC (Roller Compacted Concrete),strengthened gabions) has increased the interest for stepped channels and spillways. However stepped chute hydraulics is not simple, because of different flow regimes and importantly because of very-strong interactions between entrained air and turbulence. In this study, new air-water flow measurements were conducted in two large-size stepped chute facilities with two step heights in each facility to study experimental distortion caused by scale effects and the soundness of result extrapolation to prototypes. Experimental data included distributions of air concentration, air-water flow velocity, bubble frequency, bubble chord length and air-water flow turbulence intensity. For a Froude similitude, the results implied that scale effects were observed in both facilities, although the geometric scaling ratio was only Lr=2 in each case. The selection of the criterion for scale effects is a critical issue. For example, major differences (i.e. scale effects) were observed in terms of bubble chord sizes and turbulence levels although little scale effects were seen in terms of void fraction and velocity distributions. Overall the findings emphasize that physical modelling of stepped chutes based upon a Froude similitude is more sensitive to scale effects than classical smooth-invert chute studies, and this is consistent with basic dimensional analysis developed herein....

    2020-07-08 21:52:19浏览:30 PhysicalmodellingscaleeffectsSteppedspillwaysairentrainmentAir-water

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