Plate-type heat exchanger

Abstract

Abstract PURPOSE:To prevent crevice corrosion from occurring at a gap construction part and enhance durability of an apparatus by depositing a film of Zn or a Zn alloy on a surface for contact with a liquid medium, of stainless steel heat transfer surfaces at least one of which is used as the surface for contact with the liquid medium. CONSTITUTION:A seawater passage 2 and a passage 3 for water to be cooled are provided in gaps between a multiplicity of plates 1 disposed in parallel, and the seawater and the water to be cooled are brought into heat exchange with each other through the plates 1 as heat transfer surfaces. Gaskets 4 are placed between the plates 1, along the peripheral edges of the plates. A multiplicity of gaps are inevitably generated in the vicinity of the gaskets, in the vicinity of liquid inlet and output ports, etc. Stainless steel surfaces 12a, 12b for contact with a liquid, facing the gap 13, are coated with plates layers 14a, 14b of Zn or a Zn alloy. With Zn thus present, corrosion of stainless steel is prevented even when Zn is converted into zinc hydroxide, so that it is possible to prevent crevice corrosion and to enhance reliability of an apparatus.

Inventors

• 👤 Kenjiro Ito
• 👤 伊東　建次郎
• 👤 Masahiro Kinugasa
• 👤 衣笠　雅普
• 👤 Tsuguyasu Yoshii
• 👤 吉井　紹泰

Bibliographic Details