Abstract
Jubail Phase I consists of 6 dual purpose units, each having a boiler, turbine and desalination unit. Total design output is 30.06 mIgd of distillate and 360 MW of power, each desalination unit designed to produce 5.01 mIgd at maximum brine recycle temperature of 90.6°C using polyphosphate as the scale control additive. Long operating experience with polyphosphate [1] showed it to be a moderately effective scale control additive. It was decided to evaluate other additives available on the market, compare their effectiveness for scale control, and to conclude which one would give longest operating time before the plant performance ratio drops necessitating acid cleaning. Belgard EVN was employed as the scale control additive during commissioning and reliability trials of unit Nos. 1 and 3. Albrivap B and Flocon 247 were used on unit Nos. 2 and 4, respectively. This paper presents experience with these additives during the first four reliability trials.
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