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首页> 美国卫生研究院文献>Membranes >Numerical Simulations of Calcium Sulphate Scaling in Full-Scale Brackish Water Reverse Osmosis Pressure Vessels Using Computational Fluid Dynamics
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Numerical Simulations of Calcium Sulphate Scaling in Full-Scale Brackish Water Reverse Osmosis Pressure Vessels Using Computational Fluid Dynamics

机译：使用计算流体动力学的全尺寸脆纤维水反渗透渗透压钙钙缩放的数值模拟

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Coal mine waters often have high salinity, hardness and alkalinity. The treatment of coal mine water requires careful management of multi-stage reverse osmosis (RO) systems to achieve effective recovery of water for domestic reuse, as well as zero liquid discharge to minimise the impact to the local environment. Design of RO systems for coal mine water treatment has been limited to the use of commercial design packages provided by membrane manufacturers, which do not provide insights into the impact of operating parameters such as feedwater salinity, concentrations of sparingly soluble salts, feed pressure and their interactions with different RO modules on the fouling/scaling potential of RO membranes. This also restricts the use of novel RO products and the delivery of an optimum design based on real needs. In this work, a mathematical model was developed to simulate a standard brackish water RO pressure vessel consisting six full-size RO membrane elements, using computational fluid dynamics (CFD). The model can be used to predict the permeate flowrate, water recovery levels, as well as the spatial information of the accumulation and scaling potential of sparingly soluble salts on the membrane surface. The results obtained from the model showed good agreement with the results obtained from the commercial RO design software WAVE. The CFD model was then used to predict the scaling threshold on various positions of a full-scale RO element, at different operating conditions, using parametric simulations based on Central Composite Designs. Outputs from this work not only provide insights into the microscopic flow characteristics of multiple full-scale elements in the RO pressure vessel, but also predicts the position where scaling would occur, at different feed conditions, for any RO products.
机译：煤矿水常有高盐度，硬度和碱度。煤矿水的处理需要仔细管理多阶段反渗透（RO）系统，以实现国内重用水的有效回收，以及零液体放电，以最大限度地减少对当地环境的影响。 RO系统适用于煤矿井下水处理的设计已经限于使用由膜制造商提供的商业设计软件包，不提供深入的工作参数，如给水盐度的影响，难溶盐，进料压力和浓度的与不同RO模块的相互作用对RO膜的结垢/缩放电位。这也限制了新颖的RO产品的使用以及根据真实需求提供最佳设计。在这项工作中，开发了一种数学模型，用于模拟使用计算流体动力学（CFD）组成的标准熔化水RO压力容器。该模型可以用于预测渗透流量，水回收水平，以及难溶性盐的膜表面上的积累和缩放潜在的空间信息。从模型中获得的结果表明，与商业RO设计软件波的结果吻合良好。然后，使用基于中央复合设计的参数模拟在不同的操作条件下，使用基于CFD模型来预测全尺寸RO元件的各种位置上的缩放阈值。来自这项工作的输出不仅为RO压力容器中的多个全尺度元素的微观流动特性提供了深度，而且还预测了缩放将在不同的饲料条件下发生缩放的位置。

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