Condensation heat-transfer device
AssigneeALSTOM Technology Ltd
InventorsFrancisco Blangetti, Harald Reiss
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Abstract
The heat transfer surfaces of a condensation heat exchanger are provided with a coating according to the invention which comprises a sequence of layers which includes at least one hard layer which comprises amorphous carbon or a plasma polymer and at least one soft layer which comprises amorphous carbon or a plasma polymer. The hard and soft layers are applied alternately, the first layer on the heat transfer surface being a hard layer and the last layer of the coating being a soft layer. The last, soft layer is distinguished in particular by hydrophobic properties. The layer sequence ensures condensation of drops and, at the same time, protects against drop impingement erosion.
Claims8
A condensation heat exchanger having heat transfer surfaces for condensation of nonmetallic vapors, the heat transfer surfaces having a coating which contains amorphous carbon, characterized in that the coating comprises a sequence of layers which includes at least one hard layer comprising amorphous carbon or a plasma polymer, which is applied to the heat transfer surface, and at least one soft layer comprising amorphous carbon or a plasma polymer, the hard layers and soft layers being applied alternately, and the last layer being a soft layer and having hydrophobic properties.
The condensation heat exchanger as claimed in one of the preceding claims, characterized in that the heat transfer surfaces contain titanium, stainless steel, chromium steel, aluminum, copper alloys or carbide-forming elements.
The condensation heat exchanger as claimed in one of the preceding claims, characterized in that the coating is used to protect against ammonia erosion or corrosion.
Dependencies are inferred from the claim text.