Heat exchangers fouling in phosphoric acid concentration
Tóm tắt
Industrial heat exchanger fouling is generally defined as the accumulation and formation of undesired materials on the exchange surface. Experimental measurements of degree of fouling are both difficult and time consuming and often do not provide accurate results. However, the modeling of the thermal resistance of fouling can inform us on the evolution of this phenomenon. The present work aimed at studying fouling three types of heat exchangers, namely stainless-steel tubular and two graphite blocks from different suppliers(A and B), in an industrial phosphoric acid concentration unit belonging to the phosphoric acid production plant of the Tunisian Chemical Group (GCT) using the measurements of the operating parameters over a period of two years. The overall heat transfer coefficients and fouling resistances were evaluated at different times using the experimental data. Our results show that the resistance of fouling reach a maximal value ranging between 1.38*10−4 and 2.55*10−4 m2. K.W−1 according to the type of the heat exchanger. Therefore, the experimental data of fouling resistances were compared with Kern and Seaton predictive model. Quantitative and qualitative agreement between measured and predicted fouling resistances is good with the coefficient of determination (R2) varying between 0.97 and 0.98.
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