Flue gas desulfurization: materials for cyclic reheat systems

Journal Article · Wed Apr 01 04:00:00 EST 1987 · Mater. Compon. Fossil Energy Appl.; (United States)

OSTI ID:5758984

The cyclic heat process consists of removing heat from the hot gases ahead of the scrubber and returning this heat to the flue gas downstream of the scrubber before it enters the stack. Of the various approaches to cyclic reheat, the gas-liquid-gas heat exchange system has received the most emphasis in the US. In this concept, a heat extractor in the scrubber inlet duct transfers heat to a working fluid which is circulated through a heater unit in the scrubber outlet duct. When the boiler is operated with a high-sulfur coal, the temperature of the heat extractor unit is below the dewpoint of sulfuric acid in the flue gas, so the unit must be made of corrosion resistant material. A field exposure program is being conducted in which various materials are exposed to the flue gas from a washed Illinois No.5 coal (containing 2-3% S) at the Scholz Steam Plant of Gulf Power Company. The materials investigate to date have included: (1) austenitic, ferritic, and duplex stainless steels, (2) nickel-base alloys, (3) alloys of zirconium and titanium. Carbon steel and cast iron were used for comparison purposes, although substantial wastage was anticipated. Non-metallic materials evaluated comprised polymeric coatings and porcelainized ceramics applied to carbon steel and Pyrex glass. This paper presents and discusses the results of the material testing. 2 figures.

• OSTI ID: 5758984
• Journal Information: Mater. Compon. Fossil Energy Appl.; (United States), Journal Name: Mater. Compon. Fossil Energy Appl.; (United States) Vol. 67; ISSN MCFAD
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800* -- Coal
Lignite
& Peat-- Waste Management
20 FOSSIL-FUELED POWER PLANTS
200202 -- Fossil-Fueled Power Plants-- Waste Management-- Noxious Gas & Particulate Emissions
ALLOYS
AUSTENITIC STEELS
CARBIDES
CARBON COMPOUNDS
CARBON STEELS
CARBONACEOUS MATERIALS
CAST IRON
CERAMICS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
COAL
COATINGS
COMPARATIVE EVALUATIONS
CORROSION
CORROSION RESISTANT ALLOYS
DESULFURIZATION
DEW POINT
ENERGY SOURCES
EQUIPMENT
FERRITIC STEELS
FLUE GAS
FOSSIL FUELS
FUELS
GASEOUS WASTES
HEAT EXCHANGERS
HEAT RECOVERY EQUIPMENT
HYDROGEN COMPOUNDS
INORGANIC ACIDS
IRON ALLOYS
IRON BASE ALLOYS
IRON CARBIDES
IRON COMPOUNDS
MATERIALS
MATERIALS TESTING
NICKEL ALLOYS
NICKEL BASE ALLOYS
POLLUTION CONTROL EQUIPMENT
POLYMERS
PROTECTIVE COATINGS
RECYCLING
SCRUBBERS
STAINLESS STEELS
STEELS
SULFUR CONTENT
SULFURIC ACID
TESTING
TITANIUM ALLOYS
TRANSITION ELEMENT COMPOUNDS
WASTE HEAT UTILIZATION
WASTE PRODUCT UTILIZATION
WASTES
ZIRCONIUM ALLOYS