Heat pump distillation coupled absorption treatment of saline ammonia water
For the recovery and treatment of saline ammonia water,a certain concentration of ammonia water was prepared by evaporation desalination and distillation ammonia removal coupled absorption.A series of energy saving technologies for optimization of evaporation and distillation were proposed,namely the double effect evaporation and overhead steam direct compression heat pump distillation coupled absorption process(SchemeⅠ),the heat pump evaporation and overhead steam direct compression heat pump distillation coupled absorption process(Scheme Ⅱ),and the heat pump evaporation and the tower kettle flash recompression heat pump distillation coupled absorption process(Scheme Ⅲ).The ELECNRTL electrolyte model was selected to calculate the thermodynamic data and the phase equilibrium data of the system.Taking annual total cost,energy consumption and thermodynamic efficiency as process evaluation indicators,the three proposed treatment processes were simulated and optimized.The research results show that compared with Scheme Ⅰ,Scheme Ⅱ and Scheme Ⅲ can save annual total cost by 22.18％and 31.66％,save energy by 47.56％and 57.87％,and increase the thermodynamic efficiency by 8.59％and 2.28％,respectively.Obviously,Scheme Ⅲ has advantages in terms of the annual total cost and energy consumption,and Scheme Ⅱ has advantages in terms of thermodynamic efficiency.
saline ammonia waterheat pumpmulti-effect evaporationenergy savingannual total cost
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