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Solving equations describing the steady-state model of MSF desalination process using Solver Optimization Tool of MATLAB software

机译:使用MATLAB软件的求解器优化工具求解描述MSF脱盐过程稳态模型的方程式

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摘要

This work presents an algorithm for solving the large system of non-linear equations describing the steady state model of the two main layouts for the MSF process (the multistage flashing with brine recirculation and the once-through multistage flash desalination (MSF-OT)). The model accounts for the geometry of the stage, the mechanism of heat transfer, and the variation of the thermophysical properties of various fluids with temperature and salinity. In addition, the overall heat transfer coefficient was evaluated at each stage using convective heat transfer coefficient for internal and external flows, tube thermal conductivity and fouling resistance. Furthermore, the model takes into consideration the dependence of thermodynamic losses on stream flow rate, temperature, and the brine salinity. The system of equations was solved through an iterative procedure by using Solver Optimization Tool of MATLAB software. For each stage, the developed model was then used for evaluating the temperatures of the brine, distillate and cooling brine, the flow rates of brine outlet, distillate production, and steam heating. Finally, the resolution method was validated against the simulation results reported in the literature and the actual plant data at MSF-OT installation in Doha, Kuwait. The agreement was found to be good.
机译:这项工作提出了一种用于求解大型非线性方程组的算法,该算法描述了MSF工艺的两个主要布局的稳态模型(带盐水再循环的多级闪蒸和一次性多级闪蒸脱盐(MSF-OT)) 。该模型考虑了阶段的几何形状,传热机理以及各种流体的热物理性质随温度和盐度的变化。此外,在每个阶段使用内部和外部流动的对流传热系数,管子的导热系数和耐污性来评估总传热系数。此外,该模型考虑了热力学损失对流率,温度和盐水盐度的依赖性。使用MATLAB软件的Solver Optimization Tool通过迭代过程求​​解方程组。然后,对于每个阶段,使用开发的模型来评估盐水,馏出物和冷却盐水的温度,盐水出口的流量,馏出物的产生和蒸汽加热。最后,根据文献报道的模拟结果和科威特多哈MSF-OT安装时的实际工厂数据验证了解析方法。协议被认为是好的。

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