Metal surface protected against metal-dusting corrosion which has a thermal insulating layer

摘要

Metal surface protected against metal dusting corrosion has an insulating layer made of gas-permeable thermally insulating material. In service, the colder side of the insulating layer is located directly next to the metal surface, and the hotter side is heated by a gas stream containing CO, H2 and/or water vapour to 300-1700 degrees C. In the area between the metal surface to be protected and the hot side of the insulating layer is arranged a catalyst to convert CO with H2 and/or water vapour.