Material and cleaning options for cyclic reheat systems

Technical Report · Thu Mar 01 04:00:00 EST 1990

OSTI ID:6976561

Rosenberg, H S; Koch, G H; Krause, H H; Brockway, M C ^[1]; Keeth, R J; Ireland, P A ^[2]

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1. Battelle, Columbus, OH (USA)
2. United Engineers and Constructors, Inc., Denver, CO (USA). Stearns-Roger Div.

A cyclic reheat system employing tube-type heat exchangers can be used to transfer heat from the inlet flue gas to the outlet flue gas of a wet flue gas desulfurization (FGD) system. Because of the particularly aggressive environment in the heat extraction zone for plants burning high-sulfur coal, corrosion of the tubes can present a serious problem. An inlet gas heat exchanger (heat extractor) test apparatus was built and installed on a slipstream taken after the precipitator of a high-sulfur coal-fired power plant in order to test various tube materials and cleaning methods. The performance of metal and nonmetallic tubes was evaluated during six separate exposure periods that included two temperatures (175 and 205{degree}F, 79 and 96{degree}C) and two cleaning methods (water washing and steam soot blowing). Water washing was performed at two frequencies (1 min/24 hr and 1 min/ 4 hr) and, during one period, the tubes were not cleaned at all. Steam soot blowing was performed at a frequency of 15 sec/3 hr. The present report summarizes the results obtained from the last three exposure periods. Alloys selected for testing were of the following types: (1) austenitic, ferritic, and duplex stainless steels, and (2) nickel-base alloys. Teflon, graphite, silicon carbide, and Crystar were also tested. 12 refs., 36 figs., 9 tabs.

• Research Organization: Electric Power Research Inst., Palo Alto, CA (USA); Battelle, Columbus, OH (USA); United Engineers and Constructors, Inc., Denver, CO (USA). Stearns-Roger Div.
• Sponsoring Organization: EPRI
• OSTI ID: 6976561
• Report Number(s): EPRI-GS-6738
• Country of Publication: United States
• Language: English

Related Subjects

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36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
360604 -- Materials-- Corrosion
Erosion
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ALLOY-NI61CR22MO9NB4FE3
ALLOYS
ALUMINIUM ADDITIONS
ALUMINIUM ALLOYS
AUSTENITIC STEELS
CARBIDES
CARBON
CARBON COMPOUNDS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CLEANING
CORRELATIONS
CORROSION
CORROSION RESISTANT ALLOYS
CRYSTAL STRUCTURE
DESULFURIZATION
DOCUMENT TYPES
ELEMENTAL MINERALS
ELEMENTS
FERRITIC STEELS
FLUE GAS
FLUORINATED ALIPHATIC HYDROCARBONS
FOSSIL-FUEL POWER PLANTS
GASEOUS WASTES
GRAPHITE
HALOGENATED ALIPHATIC HYDROCARBONS
HASTELLOYS
HEAT EXCHANGERS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INCONEL 625
INCONEL ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MICROSTRUCTURE
MINERALS
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIOBIUM AL
NONMETALS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PETROCHEMICALS
PETROLEUM PRODUCTS
PITTING CORROSION
PLASTICS
POLY
POLYETHYLENES
POLYTETRAFLUOROETHYLENE
POWER PLANTS
PROGRESS REPORT
SCRUBBING
SILICON CARBIDES
SILICON COMPOUNDS
STEELS
SYNTHETIC MATERIALS
TEFLON
TEMPERATURE EFFECTS
THERMAL POWER PLANTS
TUBES
WASTES