Abstract:In order to greatly reduce the energy consumption of evaporation process in sugar plant,three kinds of energy-saving measures which include steam jet heat pump technology,extra vapor elicitation to preheat the sugar cane juice and condensate water flash are applied together in concurrent multi-effect evaporation system to concentrate sugar cane juice for the first time,meanwhile,the mathematical model of the system which is described as the form of matrix equation was established. The developed model has strong versatility,it not only can be simplified as a concurrent multi-effect evaporation model with different combinations of energy-saving measures,but also can achieve the function of extracting stream at any effect,and it can be generalized to the concentrate of other heat-sensitive solution by evaporating in food industry. There is an optimal injection coefficient and pumping position of the steam jet heat pump,and the mathematical model is high efficiency and energy saving when above three energy conservation measures are used simultaneously and the model is under optimal conditions. Iteration method combining with matrix method is used to solve the model of concentrated sugar cane juice 4 effects concurrent evaporation system with heat pump. The simulation results show that the evaporation system developed is high efficiency and energy saving when above three energy conservation measures are used simultaneously and it is under the premise of satisfying the constraints,the steam consumption can save up to about 41% when the injection coefficient is 0.5 and pumping position are set to the second effect and the temperature of sugar cane juice is preheated to 90 ℃.
