Role of FBC deposits in the corrosion of heat exchanger materials
Metallic materials selected for the construction of in-bed heat exchangers and tube support structures in fluidized-bed combustion (FBC) systems must withstand the corrosive conditions prevalent in these systems. Oxidation/sulfidation interactions leading to accelerated metal wastage of in-bed materials can occur owing to the presence of sorbent deposits on the metal surfaces and/or the low oxygen partial pressures in the exposure environment. The present paper discusses the possible mechanisms of sulfidation of iron-base ferritic and austenitic alloys and the roles of key parameters such as sorbent chemistry, gas chemistry, metal temperature, and gas cycling conditions in the corrosion process. Data on the scale thickness and depth of intergranular penetration are presented for carbon steel, Fe-2 1/4Cr-1Mo and Fe-9Cr-1Mo ferritic steels, Types 304 and 310 stainless steel and Incoloy 800 as a function of the chemistry of the exposure environment, deposit chemistry, and exposure time. The 2000-h test results from the laboratory materials evaluation program and the available data on characterization of in-bed environments are used to assess the corrosion behavior of in-bed materials in FBC systems. 18 refs., 12 figs., 4 tabs.
- Research Organization:
- Argonne National Lab., IL (USA)
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 6068376
- Report Number(s):
- CONF-860304-3; ON: DE86005559
- Resource Relation:
- Conference: Corrosion '86, Houston, TX, USA, 17 Mar 1986
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
FERRITIC STEELS
CHEMICAL COMPOSITION
CORROSION
HEAT EXCHANGERS
MATERIALS TESTING
INCOLOY 800
OXYGEN
PARTIAL PRESSURE
PIPES
STAINLESS STEEL-304
STAINLESS STEEL-310
SULFUR
CALCIUM OXIDES
CALCIUM SULFATES
CARBON STEELS
COAL
CORROSIVE EFFECTS
DEPOSITS
EXPERIMENTAL DATA
FLUIDIZED-BED COMBUSTION
HIGH TEMPERATURE
SCALING
SULFIDATION
VERY HIGH TEMPERATURE
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
CALCIUM COMPOUNDS
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
COMBUSTION
CORROSION RESISTANT ALLOYS
DATA
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INCOLOY ALLOYS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
NICKEL ALLOYS
NONMETALS
NUMERICAL DATA
OXIDATION
OXIDES
OXYGEN COMPOUNDS
STAINLESS STEELS
STEELS
SULFATES
SULFUR COMPOUNDS
TESTING
THERMOCHEMICAL PROCESSES
014000* - Coal
Lignite
& Peat- Combustion
360105 - Metals & Alloys- Corrosion & Erosion