Antifouling for plate type heat exchanger using seawater by the heat-treatment

摘要

Plate type heat exchangers are used in an Ocean Thermal Energy Conversion (OTEC) plant and heat exchangers of ships. Long hours of seawater going through these heat exchangers form bio-films and scales on the surface of plates causing problems like obstruction of heat transfer, a great increase of losing pressure, and corrosion. So far, chemical treatment such as chloride treatment and Ozonation are used as prevention, there are still problems to be solved such as effects for the environment, disposal of remains, and so on. In this study, experiment is carried out for the purpose of preventing bio-films inside the heat exchanger by heat-treatment using high-temperature-seawater as environment friendly antifouling technology so as to sterilize microorganisms and bacteria. By the result of this experiment, validity of antifouling effectiveness by the heat-treatment is suggested.