Corrosion resistance treatment of condensing heat exchanger steel structures exposed to a combustion environment
AssigneeGas Research Institute
InventorsPalitha Jayaweera, Angel Sanjurjo, Kai-Hung Lau
Life of this patent
Estimating the term…
Abstract
A condensing heat exchanger structure in contact with a combustion environment and which structure includes a ferrous substrate is provided with a corrosion resistant diffusion coating applied to the ferrous substrate via a fluidized bed application. Also provided is a method for improving the corrosion resistance of a condensing heat exchanger structure which includes a ferrous substrate and a surface portion at least partially exposed to a combustion product-containing environment. In such method, a corrosion resistant diffusion coating is applied onto the ferrous substrate via a fluidized bed application.
Claims8
An apparatus comprising:
- an inlet header having a combustion products inlet in fluid communication with a combustion products source;
- an outlet header having a liquid drain and forming a combustion products outlet;
- at least one ferrous metal combustion products conduit having an interior wall surface and an exterior wall surface and having a conduit inlet in fluid communication with said inlet header and a conduit outlet in fluid communication with said outlet header, said interior wall surface coated with a corrosion resistant diffusion coating comprising at least one coating metal selected from the group consisting of Cr, Si and Ti;
- and
- combustion products disposed within said at least one ferrous metal combustion products conduit.
Dependencies are inferred from the claim text.