Four-effect evaporator heat a process description, flow of materials: Material from the feed tank by the feed pump input preheat evaporator condensers suppliers from the condenser to preheat the plate heat exchanger and a flash tank waste heat utilization is completed After the completion of the waste heat exchange material into the second heat exchange efficiency of the heater (waste into the waste tank), after the separation efficiency to a heater, the separation effect heating backward three separate sales evaporator, efficiency of heat exchange into four, separation, until the material reaches the specified concentration of the material. Press the solution movement situation in the evaporator points are: ① recycling. Boiling solution in multiple passes through the heating chamber heated surface, such as a central circular tube, hanging baskets, external thermal Levin type and forced circulation and the like.