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    Energy-efficient evaporation process with means for vapor recovery
    4.
    发明授权
    Energy-efficient evaporation process with means for vapor recovery 失效
    具有蒸气回收方式的节能蒸发工艺

    公开(公告)号：US4466202A

    公开(公告)日：1984-08-21

    申请号：US473030

    申请日：1983-03-07

    申请人： Ulrich Merten

    发明人： Ulrich Merten

    IPC分类号： F26B21/04 ,  F26B21/08 ,  F26B23/00 ,  F26B25/00 ,  F26B3/06

    CPC分类号： F28D21/0014 ,  F26B21/04 ,  F26B21/08 ,  F26B23/004 ,  F26B25/006 ,  Y02B30/52 ,  Y02P70/40 ,  Y02P70/405

    摘要： A process is disclosed for the recovery and reuse of heat contained in the wet exhaust gases emanating from a solids dryer or liquor concentrator, particularly one in which drying or concentration is facilitated by purging the vapor with some noncondensable gas such as air or nitrogen. Water or solvent vapor in the moist exhaust mixture is separated from the noncondensable gas or gases by preferentially passing the vapor through a semipermeable membrane. The water or solvent vapor is then compressed and subsequently condensed in a heat exchanger, permitting recovery of its latent heat of vaporization for reuse in the evaporation process. In a drying process, this recovered energy is conveniently used to reheat the dry gases that exit from the membrane separator, permitting the hot, dry gases to be recirculated through the dryer. Alternatively, an indirect heat exchanger may be used to transfer this heat to the material being dried. In an evaporative process for the concentration of a liquor, the recovered energy may be used either to preheat the dry purge gases or to heat the dilute liquor being concentrated.

    摘要翻译： 公开了一种用于回收和再利用从固体干燥器或液体浓缩器发出的湿废气中的热量的回收和再利用，特别是通过用一些不凝气体如空气或氮气清洗蒸气来促进干燥或浓缩的方法。 潮湿排气混合物中的水或溶剂蒸气优先通过半透膜将蒸气从不可冷凝的气体或气体中分离。 然后将水或溶剂蒸气压缩并随后在热交换器中冷凝，允许回收其蒸发潜热以便在蒸发过程中重新使用。 在干燥过程中，这种回收的能量被方便地用于对从膜分离器出来的干燥气体再加热，允许热的干燥气体通过干燥器再循环。 或者，可以使用间接热交换器将该热量转移到待干燥的材料。 在用于浓缩液体的蒸发方法中，所回收的能量可以用于预干燥吹扫气体或加热浓缩的稀液。