Abstract
This article presents mathematical model of evaporation of aqueous solutions of mineral salts on apparatus with mechanical recompression of water vapor and process intensification upon vacuuming. The developed mathematical model is an engineering prediction where all calculations are associated with technological flowchart of evaporator. Predictions according to the mathematical model for evaporator are exemplified for the case of 2% aqueous solution of sodium chloride evaporated to 15 wt % at distillation capacity of 30 kg/h. Engineering predictions were performed consecutively in 5 stages including material calculation of evaporator; estimation of evaporator temperature mode; hydrodynamic and thermal predictions; estimation of heat transfer coefficient. The developed mathematical model was applied to stationary direct flow evaporation using Mathcad Prime software. In order to perform high quality analysis and to verify adequacy of the mathematical model, 12 criteria were selected characterizing evaporation efficiency in evaporator. Advantages of the developed mathematical model were highlighted and substantiated, practical recommendations on its application were given upon efficiency estimation of vacuum evaporation with mechanical recompression of water vapor.
Highlights
Decrease in energy consumption per unit of evaporated amount is an urgent issue during development of evaporators [1], improvement of energy efficiency of evaporators is of highest importance requiring for innovative approaches to evaporation
Such approaches include development of apparatuses with mechanical water vapor recompression (MVR) based on vacuum film evaporator with free draining film. Such apparatuses can be applied for salt removal and concentrating of various aqueous solutions of mineral salts [2,3,4], pharmaceutical organic fluids, purification of working solutions and rinsing waters of various industries
The proposed mathematical models of film evaporators are aimed at engineering prediction and selection of required equipment
Summary
Decrease in energy consumption per unit of evaporated amount is an urgent issue during development of evaporators [1], improvement of energy efficiency of evaporators is of highest importance requiring for innovative approaches to evaporation. Such approaches include development of apparatuses with mechanical water vapor recompression (MVR) based on vacuum film evaporator with free draining film. Such apparatuses can be applied for salt removal and concentrating of various aqueous solutions of mineral salts [2,3,4], pharmaceutical organic fluids, purification of working solutions and rinsing waters of various industries. This work is aimed at analytical estimation of evaporation efficiency at preset parameters of capacity in terms of distillate and concentration of dissolved matter in initial and final solution
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