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Energy efficiency of Chem Process Evaporators and Crystallizers is a crucial consideration during the designing of each customer’s specific application. Energy efficient systems utilize waste heat, multiple effects, mechanical vapor recompression (MVR) and/or thermal vapor recompression (TVR). The evaporation duty is separated into stages operating at different temperatures. External heat drives the first effect of the evaporator, with subsequent effects being driven by vapor generated from the previous higher temperature effect. Product may be passed through the evaporator in forward, back or mixed flow configurations. Additional efficiency is achieved with the use of regenerative heaters, condensate heaters and vapor heaters. In general a Multi-Stage Flash Evaporator is a series of single stage evaporators, where the steam is used for direct heating in one effect only. And the feed flow in a linear way passes through all the single stage evaporators. The basic fundamental of the multi staging is utilization of the vapors generated in preceding effect heat exchanger or Calandria under negative pressure (vacuum) condition and lowering the boiling point of the feed in the subsequent stages. More the number of effects, lesser is the steam consumption. This helps economize the utility consumption.
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