DEVICE FOR AUTOMATICALLY CONTROLLING WATER PRODUCTION IN MULTIPLE-EFFECT EVAPORATOR

摘要

PURPOSE:To secure the constant production of water by providing a water production regulating system comparing and calculating the set value of water production and the integrated value of water production, a system for correcting heating steam supply to reduce the obtained difference between the values and a system for correcting the supply of water to the first effect. CONSTITUTION:In a multiple-effect evaporator 1, a water production regulating system 53 wherein the integrated value of water production is fed back and the set value and the integrated value of water production are compared, a system 59 for correcting heating steam supply to reduce the obtained difference between both values and a system 60 for correcting the supply of water to the first effect are provided. Namely, even when the operation is performed at a low capacity, the systems 59 and 60 respond immediately since a feed-back mechanism is adopted in the set value of water production, the pressure difference between any effects is kept at a specified value, the brine injection to the lower effect is normalized. Thus, the liq. level is kept at a constant value, the defects such as the deterioration of the water quality due to the splash of mist are eliminated and the water production can be surely kept at the set value.