Method and device for the continuous and quantity-controlled liquid exchange in distillation plants and absorption refrigeration cycles

摘要

The invention relates to a method for volume-controlled continuous liquid exchange in distillation plants and absorption refrigeration circuits and an apparatus for carrying out the method. In this method, on the one hand, a liquid flow of enriched starting solution to be fed into the high pressure area is raised, on the other hand, the liquid flows of the product condensate and the depleted solution, which are to be discharged in equal amounts from the high pressure area, and the depleted solution are transferred from a high pressure level to a low pressure level. In a solution exchange device, the method uses the mechanical energy of the liquid flows to be relieved of pressure to be discharged for feeding in the enriched starting solution and requires only a minor external drive aid to overcome the internal friction and overflow losses. For this purpose, the liquid flows to be relieved of pressure are cooled down below the saturation temperature of their respective relaxation level before the mechanical energy transfer. The device works on the displacement principle. In absorption refrigeration circuits, it is preferably driven with refrigerant vapor.