| 摘要 |
PROBLEM TO BE SOLVED: To provide an evaporation concentration apparatus for caustic soda aqueous solution which is compact as a whole, connects an evaporator to a gas-liquid separator while securing a droplet collection efficiency of the gas-liquid separator as high as possible and allows adjustment of a supply flow rate of a dilute aqueous solution of caustic soda to the evaporator.SOLUTION: A multiple-effect evaporation concentration apparatus for caustic soda aqueous solution includes an evaporator for heating caustic soda aqueous solution to evaporate water and a gas-liquid separator for separating the concentrated solution concentrated by heating in the evaporator from evaporated water vapor. A plate type heat exchanger is used as the evaporator. Restriction orifices are arranged between a caustic soda supply amount control valve arranged in the inlet of the evaporator and the evaporator and, at least at one site, a plurality of restriction orifices are provided. |
