Modelling exchangers with both tube and shellsides fouling are discussed in literature 18 however the associated fouling mechanisms are different. Figure 2 shows the fouling resistances for cooling water inside a plate heat exchanger in comparison with fouling resistances on the tubeside inside a shell and tube heat exchanger for the same velocity. Jamialahmadi article pdf bayer process heat exchangers cleaning efficiency. Pdf fouling phenomenon and its effect on heat exchanger. Pdf fouling of heat transfer surfaces researchgate. However, one major phenomenon that limits heat exchanger performance is attributed to fouling.
Various studies have been carried out to study, analyse and predict its performance. Optimizing the acid dissolution of sodalite scale, sebastien fortin and raymond breault article. At some point the heat exchanger will need to be taken out of operation for cleaning. In wte plants, ash fouling is the result of several physical and chemical processes.
Such effects lead in most cases to production losses and increased maintenance costs. The fouling factor adds surface area to the heat exchanger so it can continue to meet the required capacity even though the. As a general definition, fouling is the deposition and accumulation of unwanted materials such as scale, algae, suspended solids, and insoluble salts on the internal or external surfaces of processing equipment, including boilers and heat exchangers 3. The fouling resistances inside the phe are much lower than that inside the shell and tube heat exchanger. Engineering page heat exchangers typical fouling factors. The particulate fouling is influenced by the following factors. Fouling of heat exchangers occurs in a variety of different industries. Fouling in heat exchangers 59 heat flux is high, as in steam generators, fouling can lead to local hot spots resulting ultimately in mechanical failure of the heat transfer surface. Heat exchanger fouling in phosphoric acid evaporators evaluation of field data, r. It is very detrimental to the heat exchanger performance since it leads to a loss of its thermal duty and an increase of its pressure drop. Heat exchangers as a heat transfer device has gained wide applications across different levels of domestic and industrial setups.
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