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论文类型：期刊论文

发表时间：2015-11-02

发表刊物：DESALINATION

收录刊物：SCIE、EI

卷号：375

页面范围：40-47

ISSN号：0011-9164

关键字：Desalination; Multiple effect evaporation; Thermodynamic loss; Flow resistance; Boiling point elevation; Operating characteristic

摘要：Thermodynamic losses caused by the flow resistances and the boiling point elevation (BPE) in low-temperature multi-effect evaporation (LT-MEE) desalination plant were investigated. The purpose is to provide detailed considerations for the design and modeling of LT-MEE process. Design parameters were analyzed to evaluate their effects on thermodynamic losses. Results indicate that on the premise of constant distillate production, as the sequence number of evaporator/condenser increases, each flow resistance decreases first and then increases, while the variation of corresponding temperature depression always performs a rising tendency. With the increase of tube length, the proportion of saturated temperature depression caused by the in-tube condensation flow resistance increases, and that caused by the inter-tube flow resistance decreases. The tube length for the lowest temperature depression occurs when two temperature depressions are in similar proportions. The thermodynamic losses caused by the flow resistances and the BPE account for considerable percentages, especially when under smaller temperature difference. The operating characteristics of LT-MEE desalination plant are summarized based on the analysis. (C) 2015 Elsevier B.V. All rights reserved.