Abstract
A widely used technique for controlling scale deposition in desalination practice is by dosage of anti-scalants. Fundamental techniques for assessing the relative effectiveness of different anti-scalants are of considerable interest. The objective of the present research was to extend a technique characterizing the effectiveness of anti-scalants by identifying the threshold concentration at which scale deposition is unaffected by transport hydrodynamics and is purely surface controlled. A lower threshold level denotes higher inhibition effectiveness. The system investigated consisted of an electrically heated annular flow heat exchanger enabling measurement of calcium sulfate scale deposition on a stainless steel heating surface at a constant surface temperature. Application of the technique is illustrated by scale deposition measurements performed at varying Reynolds numbers in the absence and presence of three anti-scalants and at different scale deposition temperatures.
Original language | English |
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Pages (from-to) | 38-42 |
Number of pages | 5 |
Journal | Desalination |
Volume | 397 |
DOIs | |
State | Published - 1 Nov 2016 |
Externally published | Yes |
Keywords
- Calcium sulfate
- Heat exchanger
- Mass transfer control
- Scale inhibition
- Surface control