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论文类型：期刊论文

发表时间：2020-01-05

发表刊物：APPLIED THERMAL ENGINEERING

收录刊物：EI、SCIE

卷号：164

ISSN号：1359-4311

关键字：Falling film evaporator; Horizontal tube bundle; Distributed parameter model; Brine temperature distribution

摘要：Falling film evaporator applied in multi-effect evaporation device is normally operated under small temperature differences. Considering the high sensitive of the evaporator, the distribution of the brine temperature, as one of the parameters that determines the distribution of the local temperature difference, is studied in this paper using parameter distributed model. The three-dimensional distributions of the brine temperature as well as the location of the maximum brine temperature are presented under different operating conditions. Results show that the maximum variation range of the brine temperature in the evaporator decreases with the increment of the brine inlet spray density and salinity but increases with the increment of the apparent temperature difference. In the aim of avoid design failure of the local temperature difference, the variation of the location of the maximum brine temperature as well as the thermodynamic losses in the brine film are analyzed, providing theoretical basis for the more accurate design of the falling film evaporator.