Optimization Design for DTB Industrial Crystallizer of Potassium Chloride

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• 作者：Xingfu Song ; Menghua Zhang ; Jin Wang ; Ping Li ; Jianguo Yu
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2010
• 出版时间：November 3, 2010
• 年：2010
• 卷：49
• 期：21
• 页码：10297-10302
• 全文大小：317K
• 年卷期：v.49,no.21(November 3, 2010)
• ISSN：1520-5045

文摘

A computational fluid dynamics (CFD) model was developed for the simulation and optimization of an existing continuous DTB crystallizer with KCl productivity of 0.1 million tons per year. The multiple reference frame (MRF) method was used in the CFD simulation. Both the hexagonal grid and the tetrahedral grid were adopted to divide meshes in this industrial DTB crystallizer, and in total 866388 cells were used for CFD simulation. The fluid flow field in the DTB crystallizer was calculated using FLUENT6.3 software with the Reynolds-averaged Navier−Stokes equation combined with the widely used κ−ε turbulence model. The crystal size distribution and the coefficient of variation of crystal product were studied by CFD simulation of two-phase flow model. The impeller shapes and various operating conditions were optimized to reduce the energy consumption of the crystallization process and to increase the KCl product quality. Based on the CFD optimization design, a new impeller was retrofitted into an existing continuous DTB crystallizer with the KCl productivity of 0.1 million tons per year located at Qinghai salt lake plant in China, and its excellent performance was confirmed against data collected using the original impeller.