Plate fin heat exchanger and method of making thereof
AssigneeKabushiki Kaisha Kobe Seiko Sho
InventorKenichiro Mitsuhashi
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Abstract
To prevent with certainty corrosion by mercury even in nonoperating of plant facilities, plate fins 1 and flat plates 2 of flow passage members constituting cooled fluid passages and refrigerant passages are formed by an aluminum alloy and on surfaces of the plate fins 1 and the flat plates 2, an oxide film formed by a reaction between the aluminum alloy and an oxidizing component in an oxidizing gas is formed, or a hydroxide film formed by a reaction between the aluminum alloy and an alkaline component in an alkaline aqueous solution is formed.
Claims8
A plate fin heat exchanger, comprising:
- cooled fluid passages, and
- refrigerant passages,
- wherein said cooled fluid passages and said refrigerant passages comprise an aluminum alloy and an oxide film on surfaces of said cooled fluid passages and said refrigerant passages, and
- said oxide film is prepared by a process comprising reacting said aluminum alloy and an oxidizing gas comprising 25-35 volume % oxygen.
A method of making a plate fin heat exchanger, comprising:
- forming an oxide film on surfaces of cooled fluid passages and refrigerant passages of a plate fin heat exchanger comprising an aluminum alloy, by reacting said aluminum alloy with an oxidizing gas comprising 25-35 volume % oxygen, at a temperature of 250.degree.-350.degree. C.
A plate fin heat exchanger, comprising:
- cooled fluid passages;
- and
- refrigerant passages,
- wherein said cooled fluid passages and said refrigerant passages comprise an aluminum alloy and a hydroxide film on surfaces of said cooled fluid passages and said refrigerant passages, and
- said hydroxide film is prepared by a process comprising reacting said aluminum alloy and an alkaline aqueous solution comprising 1-7% sodium hydroxide.
A method of making a plate fin heat exchanger, comprising:
- forming a hydroxide film on surfaces of cooled fluid passages and refrigerant passages of a plate fin heat exchanger comprising an aluminum alloy, by reacting said aluminum alloy with an aqueous solution comprising 1-7% sodium hydroxide.
Dependencies are inferred from the claim text.