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首页> 外文会议>MWWD amp; IEMES 2012 >On the optimization of the diffuser parameters for the release of brine from submerged outfalls
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On the optimization of the diffuser parameters for the release of brine from submerged outfalls

机译：从潜水排污口释放盐水的扩散器参数的优化

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摘要

The most effective and economical way to dispose brine from large and medium size desalination plants is via submerged outfallsrnemploying single port or multiport diffusers. The brine is denser than the sea water, so it tends to sink downwards driven by thernnegative buoyancy: consequently, after the initial turbulent dilution the brine reaches the sea bottom, where the possibility forrnadditional mixing is low. This implies a local increase in salinity and potential environmental hazards to sensitive species. As arnconsequence, the outfall position and the diffuser parameters should be properly designed according to the largest dilution achievablernbefore the brine sinks to the sea floor, combined with the lowest economical costs. As dilution is proportional to the distance coveredrnbefore sinking to the floor, the diffusers are typically inclined upwards, with an angle to the horizontal, to increase this path. Under thesernconditions, these kinds of release are neither axisymmetric nor Gaussian and, consequently, the classical one-dimensional integralrnequations for simple jets and plumes cannot lead to precise results.rnHere we present the results from series of laboratory experiments of the release of brine from submerged outfalls, under the wholernrange of practical conditions (angle to the horizontal of the diffuser, density of the brine, etc.). The experiments were performed byrnmeans of LIF (Laser Induced Fluorescence) and RIV (Robust Image Velocimetry), two non-intrusive techniques that allow thernmeasurement of concentrations and velocity fields.rnThese results have been compared with previous available results and summarized in equations linking the diffuser parameters to therndimensions of the region interested by the release and to the dilution, useful to optimize these parameters under given environmentalrnand economical constrains. The dilution shows a direct proportionality to the densimetric Froude number and a parabolic dependencernon the angle of release to the horizontal.
机译：处置大中型海水淡化厂中盐水的最有效，最经济的方法是通过使用单端口或多端口扩散器的水下排污口。盐水比海水浓，因此在负浮力的作用下倾向于向下沉：因此，在最初的湍流稀释之后，盐水到达了海底，额外混合的可能性很低。这意味着盐度的局部增加以及对敏感物种的潜在环境危害。因此，应根据盐水沉入海底之前可实现的最大稀释度，并结合最低的经济成本，适当设计排污口位置和扩散器参数。由于稀释与下沉到地板之前的覆盖距离成正比，因此扩散器通常向上倾斜，与水平方向成一定角度，以增加该路径。在这种情况下，这类释放既不是轴对称的也不是高斯的，因此，对于简单的射流和羽状流而言，经典的一维积分方程不能得出精确的结果。在整个实际条件下（与扩散器水平方向成角度，盐水密度等）排污。实验是通过两种LIF（激光诱导荧光）和RIV（稳健图像测速）技术进行的，这两种非侵入性技术都可以测量浓度和速度场。释放区域和稀释所需的区域尺寸参数，可在给定的环境和经济约束下优化这些参数。稀释度与密度弗劳德数成正比，与抛物线的依赖性与释放角度成水平。

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  • 来源
    《MWWD amp; IEMES 2012》|2012年|1-17|共17页
  • 会议地点 Montenegro(ME)
  • 作者

    Simone Ferrari; Maria Grazia Badas; Luigi Antonio Besalduch; Giorgio Querzoli;

  • 作者单位

    University of Cagliari, DICAAR (Dipartimento di Ingegneria Civle,Ambientale e Architettura), Cagliari, Italy – ferraris@unica.it;

    University of Cagliari, DICAAR (Dipartimento di Ingegneria Civle,Ambientale e Architettura), Cagliari, Italy – mgbadas@unica.it;

    University of Cagliari, DICAAR (Dipartimento di Ingegneria Civle, Ambientale e Architettura),Cagliari, Italy – besalduch@unica.it;

    University of Cagliari, DICAAR (Dipartimento di Ingegneria Civle, Ambientale e Architettura), Cagliari, Italy – querzoli@unica.it;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Brine discharge; diffuser design; dense jets; dilution; turbulence;

    机译：盐水排放;;扩散器设计;;浓密射流;;稀释;;湍流;

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