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Removal of Scale Deposited on the Internal Surfaces of Pipes in Cooling Systems | ||
| Journal of Engineering | ||
| Article 1, Volume 12, Issue 1, 2006, Pages 99-112 | ||
| Authors | ||
| Ajwa saber majeed; Abbas H. Sulaymon | ||
| Abstract | ||
| The possibility of using inhibited hydrochloric acid in descaling of water deposits on heat exchanger and cooling system tubes have been investigated. A dynamic flow system was designed for this state. Experiments were carried out using different, temperatures. Solution flow rates, times, and different hydrochloric acid concentrations inhibited with hexamine. kinetics of acid - iron oxide scale reaction was studied using hydrochloric acid .The kinetics analysis showed that the acid- FeO scale reaction followes 1st order reaction. It was found that the FeO scale removal was mass transfer controlling process. Iron-oxide scale removal process was analyzed as mass transfer operation and adequate semi-empirical correlations for scale removal ( or mass transfer rate) under different conditions, in a dimensionless form have been obtained. The results of iron- oxide scale removal (or mass transfer rate) are compared with many proposed models particularly those based on the concept of analogy among momentum and mass transfer. Prandtl- Taylor analogy showed a good agreement with experimental mass transfer results. | ||
| Keywords | ||
| scale; Chemical cleaning; Deposit; hydrochloric acid; Descaling | ||
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