抄録
1. Sea water free from Ca being its PH about 5 was feeded to tube boiler, 20kg/cm2 press, during 19days extracting continuosly concentrated brine (Ca. 17°Bé). Acidity of feed water Were PH 5 at feeding PH 7 in preheater and PH 8 over of brine. At this condition, no scale deposits and no covasion decoquised in the boiler no coloured the brine. In the case of higher PH, deposited Mg (OH)2 and lower PH. were covrobed the boiler.
2. Sea water free from Mg & Ca being its PH about 7 was feeded to tube boiler, 20-30kg/cm2 press,(Takuma or Galbe) during long period extracting continuously conc. brine (about 17°Bé). Its PH indicates over 8 in preheater and over 11 of brine. No scale was deposited and no corrosion was recognised in the boiler.
3. Heat efficiency of the boiler between the purified sea water feeding and water feeding was no difference being a little higher the preceding.
4. No chloride was detected in the steam from boiler by neears of Ag No.3. and no chlorode was deposited in the superheater.
