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Simultaneous optimisation of heat and power integration of evaporation–crystallisation systems: a case study of distiller waste from Solvay process
Optimization and Engineering ( IF 2.1 ) Pub Date : 2021-05-23 , DOI: 10.1007/s11081-021-09641-z
Nidret Ibrić , Elvis Ahmetović , Zdravko Kravanja

This paper addresses the synthesis of combined evaporation–crystallisation systems for the recovery of valuable materials from waste in line with sustainable development and circular economy concepts. The primary focus of this work is the utilisation of distiller waste from the Solvay process, which comprises sodium chloride (NaCl), calcium chloride (\({\text {CaCl}}_2\)) and water (\(\hbox{H}_2\)O). The superstructure optimisation of a heat and power integrated evaporation–crystallisation system is performed by solving the proposed Mixed-Integer Nonlinear Programming (MINLP) model. The superstructure extends our recent research to include the partial crystallisation of NaCl and the production of concentrated \({\text {CaCl}}_2\) solution. To address the considered case study, a thermodynamic model for multi-component electrolytic systems is developed. A three-step solution strategy is proposed to circumvent a problem with nonlinearities and to solve the overall MINLP model. The optimal design of a heat-integrated evaporation–crystallisation system with mechanical vapour compression is presented and the main conclusions are highlighted.



中文翻译:

蒸发结晶系统热和功率集成的同时优化:以索尔维工艺中的蒸馏水为例

本文讨论了结合蒸发-结晶系统的合成方法,该方法可根据可持续发展和循环经济概念从废物中回收有价值的材料。这项工作的主要重点是利用来自Solvay工艺的蒸馏器废物,其中包括氯化钠(NaCl),氯化钙(\({\ text {CaCl}} _ 2 \))和水(\(\ hbox {H } _2 \) O)。通过求解所提出的混合整数非线性规划(MINLP)模型,进行了热电一体化蒸发结晶系统的上层结构优化。上层结构将我们最近的研究扩展到包括NaCl的部分结晶和浓缩\({\ text {CaCl}} _ 2 \)的产生解决方案。为了解决所考虑的案例研究,开发了用于多组分电解系统的热力学模型。提出了一种三步求解策略来解决非线性问题并求解整个MINLP模型。提出了具有机械蒸汽压缩的热集成蒸发-结晶系统的最佳设计,并着重指出了主要结论。

更新日期:2021-05-23
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