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diagram of a double-effect falling film evaporator. Condensing vapors from flash tank B1 heat evaporator A2. •1=feed •2=product •3=steam •4=vapors. In chemical engineering, a multiple-effect evaporator is an apparatus for efficiently using the heat from steam to evaporate water. [1]
A two evaporator single compressor with individual expansion valves for each evaporator after passing through the back pressure valve enters into the compressors and hence there is a significant rise in temperature is observed. This system helps in dropping the pressure from high pressure evaporators with the help of back pressure valves.
Adding another effect reduces it to 33% and so on. A heat-saving-percent equation can estimate how much one will save by adding a certain number of effects. The number of effects in a multiple-effect evaporator is usually restricted to seven because, after that, the equipment cost approaches the cost savings of the energy-requirement drop.
The best way to achieve high economies (which can be well over 100%) is to use multiple effect evaporator, whereby the vapour from one evaporator – or effect – is used to heat the feed in the next effect, where boiling occurs at lower pressure and temperature [3] Thermo-compression of the vapour, whereby the vapour will condense at a ...
The best way to reduce energy consumption is by using multiple-effect evaporators. For multiple-effect evaporators, the steam from outside is condensed by the heating element of the first effect and the vapors produced from the first effect are then recycled back to the second effect, where the feed will be partially concentrated product of the ...
This boiling point elevation is a challenge for vapor-compression evaporation in that it increases the pressure ratio that the steam compressor must attain to effect vaporization. Since boiling point elevation determines the pressure ratio in the compressor, it is the main overall factor in operating costs.
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