MULTISTAGE EVAPORATING-THICKENING/CONDENSING APPARATUS AND METHOD

摘要

Provided is a multistage evaporating-thickening/condensing apparatus especially for improving a gasification efficiency, a condensation efficiency and energy saving easily.  The apparatus heats a stock solution thereby to gasify a portion of a solvent into a thickened liquid in an evaporation chamber and to convert the gasified steam into a condensed liquid in a condensation chamber.  The apparatus is characterized by comprising: an evaporating treatment unit (1) having a plurality of evaporation chambers (11 - 12) laminated vertically; a condensing treatment unit (2) disposed to face the evaporating treatment unit and having a plurality of condensation chambers (20 - 22) vertically laminated so as to be individually displaced by predetermined dimensions from the individual evaporation chambers; demisters (3) disposed to make the adjoining evaporation chambers and the condensation chambers communicate with each other; a gas flow forming means (4) for circulating a gas flow through the demisters (3) from the evaporation chamber (10) at the uppermost stage to the condensation chamber (22) at the lowermost stage; liquid-liquid heat exchangers (5) for exchanging heat between a stock solution (a) and the condensed liquid accumulating in the condensation chambers thereby to heat the stock solution (a); and an injection means (6) for converting the stock solution, the thickened liquid and the condensed liquid into liquid droplets or mist.