Application of composite heat transfer tubes in power plants
Metallurgically bonded composite steel tubes have the potential to fulfill combined corrosion and strength requirements in power plants which cannot be met by existing tube materials. The component materials can be chosen freely among existing steel grades as long as heat treatment compatibility during manufacture is ensured. Service trials with a composite superheater tube made of a high creep strength austenitic steel clad with a 25Cr-20Ni steel were carried out with encouraging results. The corrosion rate was found to be lowered to about one third of that for conventional austenitic superheater steels. This good experience has led to installation on a larger scale of this type of composite tube in the final superheaters of a number of coal-fired power stations in the United Kingdom. A composite tube with 50 Cr-50 Ni alloy in the outer component has been put into service in superheaters with extremely severe corrosion conditions. The reported results indicate a considerably increased life on these tubes in relation to conventional austenitic superheater tubes.
- OSTI ID:
- 6231406
- Journal Information:
- Mater. Compon. Fossil Energy Appl.; (United States), Vol. 40
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING
20 FOSSIL-FUELED POWER PLANTS
BOILERS
TUBES
FOSSIL-FUEL POWER PLANTS
COMPOSITE MATERIALS
CORROSION RESISTANCE
FABRICATION
MECHANICAL PROPERTIES
CHROMIUM-NICKEL STEELS
CREEP
EXTRUSION
HEAT TRANSFER
HEAT TREATMENTS
MATERIALS
STEELS
ALLOYS
CHROMIUM ALLOYS
CHROMIUM STEELS
ENERGY TRANSFER
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS WORKING
NICKEL ALLOYS
POWER PLANTS
THERMAL POWER PLANTS
360105* - Metals & Alloys- Corrosion & Erosion
420400 - Engineering- Heat Transfer & Fluid Flow
200104 - Fossil-Fueled Power Plants- Components