Indexed by:期刊论文

Date of Publication:2019-08-01

Journal:APPLIED THERMAL ENGINEERING

Included Journals:SCIE、EI

Volume:159

ISSN No.:1359-4311

Key Words:Desalination; Multi-effect evaporation; Thermal vapor compression; Mathematical modeling; Performance analysis

Abstract:Multi-effect evaporation/multi-effect evaporation with thermal vapor compression processes have shown more remarkable advantages than the other thermal desalination technologies, especially applicable to large scale and utilization of the industrial waste heat. A precise model is essential for development and improvement of the desalination system. In this paper, a detailed mathematical model of multi-effect evaporation/multi-effect evaporation with thermal vapor compression desalination system is developed based on the first law and second law of thermodynamics, of which the key parameters derive from the database established by targeted experimental studies. Verification of the model is conducted by comparison with various commercial plants. Results indicate that the simulation results agree well with the available data of actual plants. In addition, advantages and limitations of the present model are discussed by comparing with three models from the literature. Based on the mathematical model, the effects of pressures of motive steam and suction steam are deeply investigated. Performance comparison between multi-effect evaporation and that with thermal vapor compression was accomplished from the perspective of exergy destruction as well. Results show that higher gained output ratio and lower specific cooling water can be acquired when the compression ratio of thermal vapor compressor is 2.1-2.6.