Limpeza CIP: Comparação das cinéticas em permutadores de calor

Abstract

In this work, the behavior of the process of removing sodium hydroxide residue adhered to the internal surface of two heat exchangers, namely: shell and tube exchanger and plate exchanger. The evaluation of waste removal kinetics was performed based mathematical model developed from a transfer function. The flow velocity values were chosen based on studies published in the literature, which report the use of lower flow velocities (equal to or greater than 0.20 m/s). An alkaline detergent solution formed by sodium hydroxide at 0.5% w/w and a speed of 0.41 m/s was used for the shell and tube heat exchanger, with an operating time of 30 minutes, and a speed of 0.43 m/s for the plate heat exchanger, with an operating time of 3 minutes. The behavior of the kinetics of removal of alkaline detergent showed significant differences, allowing us to infer that, from a statistical point of view, the two processes are quite different. The use of approximate mathematical models allowed a satisfactory evaluation of the behavior of the kinetics of waste removal in each heat exchanger.