Thermally sprayed coatings for boiler protection

Conference · Sat Dec 30 23:00:00 EST 1995

OSTI ID:245013

Gustafsson, S; Steine, H T ^[1]; Ridgway, W F ^[2]

---

1. Eutectic and Castolin, Lausanne (Switzerland)
2. Eutectic and Castolin, New York, NY (United States)

FBC boilers are large, expensive installations which suffer enormously from wear caused by corrosion, aggravated by high temperatures. The exact type of wear experienced varies from one part of a boiler to another and is influenced by the overall design of the boiler and the type of fuel burnt in it. Boiler manufacturers and users face a difficult choice in selecting materials to fight these problems. Inexpensive and easily worked metals, unfortunately, offer little resistance to the types of wear experienced in boilers, while alloys which are resistant to erosion and corrosion are very costly as well as being difficult to form and join. This paper presents a number of ways in which these material losses and related costs in boiler systems can be reduced by application of thermally sprayed coatings which lead to significant increases in service life. The selection of the coating material and of the correct deposition process can, today, be based on the results of laboratory tests (elevated temperature corrosion and erosion), small scale in-situ test coatings and on full scale FBC boiler protection coating utilization. Practical examples are given of thermal spray coatings which have been successfully applied to different kinds of FBC boilers including those burning coal, waste (chemical, industrial, household) and wood chips. The paper describes the procedures for applying coatings to boiler components, the properties of the resulting coatings and how best to select coating materials for use in some specific wear and corrosion environmentals. In addition, future trends in the utilization of thermally sprayed coatings are discussed.

• OSTI ID: 245013
• Report Number(s): CONF-950522--; ISBN 0-7918-1305-3
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
09 BIOMASS FUELS
36 MATERIALS SCIENCE
ALLOYS
ALUMINIUM ALLOYS
CERAMICS
CHROMIUM CARBIDES
COAL
COBALT BASE ALLOYS
CORROSION RESISTANCE
FLAME SPRAYING
FLUIDIZED BED BOILERS
FLUIDIZED-BED COMBUSTION
INDUSTRIAL WASTES
IRON CARBIDES
MOLYBDENUM CARBIDES
MUNICIPAL WASTES
NICKEL ALLOYS
NICKEL BASE ALLOYS
PLASMA ARC SPRAYING
PROTECTIVE COATINGS
SPRAY COATING
SPRAYED COATINGS
TITANIUM CARBIDES
WATERWALL INCINERATORS
WEAR RESISTANCE
WOOD WASTES