The present article compares the effectiveness of two chemical compounds to reduce the growth of biofilm adhering to the tubes of a heat exchanger-condenser refrigerated by seawater. The compounds tested in the study were: a quaternary ammonium compound (QAC) and an aliphatic amine (triethanol amina, TA). Each biocide was applied intermittently in a first shock stage and in a second stabilising stage. Prior to biocide dosing, a biofilm was created in the inner surface of the heat exchanger tubes under study (AISI 316L and 316Ti stainless steel). The evolution of the biofilm during growing and treatment phases was followed by indirect measurements, i.e. fluid frictional resistance (f) and heat transfer resistance (Rf). The article also presents results of the impact of the different control strategies applied to the heat exchanger condenser efficiency. Both compounds removed the biofilm, and the tubes were practically restored to their clean condition. Ecotoxicology studies classified both biocides as environmentally harmless under the testing conditions.
Application of quaternary ammonium compound and aliphatic amine as biocides in the mitigation of microfouling adhered to the internal surface of heat exchangers condensers refrigerated by seawater. Impact on the efficiency of different control strategies applied
Journal of Marine Engineering & Technology ; 20 , 1 ; 42-51
2021-01-01
10 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
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