溶剂冷凝回收工序 有蒸发冷凝器和汽提冷凝器

溶剂的冷凝与蒸发系统结合比较紧密，其中有蒸发冷凝器和汽提冷凝器是在负压下进行的。不凝性气体由蒸发器的壳体进入节能器，在节能器中，不凝性气体与来自蒸发冷凝器凝液进行热交换，终排出节能器的冷凝液温度得到提，溶剂分水后到溶剂周转罐，较的温度使其循环使用时可不用再加热，以达到节能的目的。

从节能器出来的不凝性气体进入蒸脱冷凝器，在这里大量气体被冷凝，尾气排入后冷凝器。
浸出器中产生的溶剂气体进入浸出器冷凝器，不凝性尾气进入后冷凝器。进入后冷凝器的自由气体还有分水箱、周转罐、地下溶剂库，混合油罐的自由气体，在这里用较低温度的冷水进行冷却，回收大部分溶剂气体。含微量溶剂的尾气进入石蜡回收工序。

Solvent Condensation & Recovery Process
Solvent condensation system combines with evaporation system closely, and evaporative condenser and steam stripping condenser all work under negative pressure. Non-condensable gas enters the energy saver from the shell of the first evaporator. In energy saver, non-condensable gas exchanges heat with condensate from the evaporative condenser. Finally, the condensate temperature discharged from energy saver is increased, and the solvent separated from water goes to solvent holding tank. The high temperature makes it unnecessary to be reheated for the recycling, so as to save energy.

Non-condensable gas from energy saver enters desolventizing condenser, in which a great deal of gas is condensed, and the tail gas is discharged into the final condenser. The solvent gas from the extractor enters extraction condenser, and the non-condensable tail gas enters the final condenser. For the free gas in final condenser, diversion box, holding tank, underground solvent library and miscella tank, cool them with low-temperatured cold water to recycle most of solvent gas. The tail gas with little solvent goes to paraffin recovery process.