Describes the operation of a tripleeffect evaporator to concentrate a solute liquid solution using significantly less energy than a singleeffect. Water is removed from a solution by boiling the liquor in an evaporator and withdrawing the vapour. Multiple effect evaporator the multipleeffect configuration combines two or more evaporator bodies to conserve steam, which is condensed in the firsteffect heat exchanger only. A sugar evaporator is a heat exchanger tubular calandria. Pdf single and multiple effect evaporators pranavv. In a multipleeffect evaporator, vapor from one body heats a second body at a lower boiling temperature. During evaporation, a solution of cane juice is concentrated by the addition of heat.
In case of a singleeffect evaporator, the vapor from the boiling liquor is condensed and the concentrated. Multiple effect evaporation remains one of the popular methods used for the concentration of aqueous solutions. Evaporators may be composed of one or more effects, where an effect is defined as one or more bodies operating at the same boiling temperature. Heating is performed by passing steam inside the tube bundle. Model and optimisation of a multieffect evaporator of sugarcane. Water evaporated in the firsteffect vapor body is condensed in the secondeffect heat exchanger, which provides energy for evaporation in the secondeffect vapor body and so on for additional effects. Milk condensing in vacuum pan uses high amount of steam to evaporate water. Example 55 a tripleeffect forcedcirculation evaporator is to concentrate a 10 per cent solution of sodium hyroxide to 50 per cent. Multiple effect evaporators mee dealing with the concentration of weak black liquor from pulp mill of paper industry consume a large amount of thermal energy in form of steam 2540%.
The feed is to be at 100f and is to be of such an amount as to contain 5 tons naoh per hour. Dynamic simulation of multiple effect evaporators in paper. Noniterative design of multiple effect evaporators using excel addins. Consider two evaporators connected so that the vapour line from one is connected to the steam chest of the other as shown in fig. Multiple effect evaporator is used for steam economy. Evaporators are classified by the number of effects. The multipleeffect configuration combines two or more evaporator bodies to conserve steam, which is condensed in the firsteffect heat exchanger only.
In a singleeffect evaporator, steam provides energy for. Evaporation is the removal of solvent as vapor from a. The heating steam loses its latent heat and condenses before it flows out of the tube bundle. In any evaporation operation, the major process cost is the steam consumed. A multipleeffect evaporator, as defined in chemical engineering, is an apparatus for efficiently using the heat from steam to evaporate water. In the evaporator, the seawater fed in is heated to its boiling temperature and is partly evaporated by boiling. Pdf holistic optimisation of solarassisted multiple. Noniterative design of multiple effect evaporators using.
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