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Design and Test of Thermal Vapor Compressor Pump for Low-Temperature Multi-Effect Seawater Desalination
Pages: 1495-1499
Year: Issue:  12
Journal: Vacuum Science and Technology

Keyword:  Seawater desalinationLow-temperature multi-effect distillationTVC pumpSteam ejector pump;
Abstract: A novel type of thermal vapor compressor( TVC) pump with adjustable steam flow-rate,known as steam ejector pump and dedicated to the low-temperature multi-effect distillation( LT-MED) seawater desalination equipment with 10-kiloton daily capacity,was designed and fabricated on the basis of simulation with self-developed software Computational Fluid Dynamics( CFD); theoretically analyzed and experimentally tested in the home-built,large test-platform. The influence of the geometries and arrangement of the adjustable mandrel and nozzle in TVC pump on the steam’s flow-rate,pressure and temperature was simulated with CFD software and investigated with the test-platform for design optimization. The results show that the axial displacement of the mandrel significantly affects the steam flow-rate across the nozzle-throat because the cross-sectional area of the nozzle-throat strongly depends on the mandrel-nozzle alignment. The adjustable mandrel / nozzle separation results in 40% ~ 110% variations of desalinationefficiency with minor impact on the other desalination conditions,because the adjustment of mandrel / nozzle separation weakly influences the flow-rate,temperature and pressure of the motive steam.
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