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User’s manual: rev 0Page 6/36Forced circulation evaporator:The forced circulation evaporator is used on liquid with a concentration higher than in falling film. When viscosity, density and risk of crystallization are more important, this type of evaporator is used. See hereafter drawings of the forced circulation exchanger, a separator and circulation pump.This kind of exchanger is composed by a circulation flow with a high flow. The aim is to have enough speed in the tubes, to avoid any deposit.The exchanger and the tubes are full of vinasses, it means there is no evaporation in the exchanger. Between the inlet and the outlet of the exchanger, the vinasses are just heat (1 to 3°C heating), and send back to the separator. When the hotter vinasses go back in the separator with a temperature higher than boiling point, a part of the vinasses flash, and the temperature decreases to boiling temperature.The vapor produced, is slowed down again in the separator to decrease foaming risk.2.2. Heat capacity and enthalpyThe heat capacity is the amount of energy necessary to heat a liquid of a temperature.The heat capacity of the water is 1 kcal/kg/°C. It means 1kcal is necessary to heat 1 kg of water of 1°C.The weak vinasses will have a heat capacity close to 1 kcal/kg/°C. When the vinasses will be more concentrated, this heat capacity will decrease.
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