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《Computers and Applied Chemistry》 2001-01
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Building and Solving of the Objection Function for Multi-Effect Evaporation Optimum Design

RUAN Qi HUANG Shi\|huang YE Chang\|shen CHEN Wen\|bo (Department of Chemical Engineering, Fuzhou University, Fuzhou 350002)  
A new optimum design mathematical model of cocurrent multi-effect evaporation with condenser water flash is developed which aims at the minimum annual cost, including cost of fresh vapor, vacuum system, evaporator, maintenance and depreciation. The model based on decisive variables such as the pressure of fresh vapor, the pressure of condenser and effective heat transfer temperature difference of vary effect, is solved by the complex method, Lagrange multiplier method and matrix method. The practical example indicates that the effect of the pressure of vapor, the pressure of condenser, flash of condenser water and price parameters is substantial on the optimum results. The annual cost by the new optimum design is decreased by above 16% than that by the conventional design. The new algorithm increases the convergent speed and stability.
【CateGory Index】: TQ021
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