Material and cleaning options for cyclic reheat systems: Midterm report: Interim report, September 1988

Technical Report · Thu Sep 01 04:00:00 EDT 1988

OSTI ID:7101349

Krause, H H; Ireland, P A; Charles, G A

A cyclic reheat system for a wet flue gas desulfurization system extracts heat from the inlet flue gas and transfers this heat to the outlet flue gas. One method of achieving this uses tube-type heat exchangers in the inlet and outlet gas streams with a fluid (e.g., water) circulated between them. For plants burning high-sulfur coal, questions of materials selection and cleaning methods of the inlet heat exchanger exist because of the potential for acid condensation. An inlet gas heat exchanger test apparatus was built and installed on a slipstream taken after the precipitator of a high-sulfur coal-fired power plant. Results obtained from the first 3061 hours of exposure indicated low corrosion rates for several stainless steels and that a water wash prevented solids buildup on the heat exchanger tubes. The second exposure period of 3046 hours, during which the heat exchanger was not washed, resulted in severe pitting of many of the alloys beneath the deposits that accumulated. During the 3167 hours of the third exposure period, the operating temperature of the heat exchanger was increased from 79.4 C (175 F) to 96 C (205 F) and the frequency of water washing was reduced from that of the first period. These conditions increased corrosion rates of some alloys and reduced rates of others compared with the first exposure period. This report summarizes the results of the three exposure periods. 6 refs., 49 figs., 8 tabs.

• Research Organization: Electric Power Research Inst., Palo Alto, CA (USA); Battelle Columbus Labs., OH (USA); Stearns Catalytic Corp., Denver, CO (USA)
• OSTI ID: 7101349
• Report Number(s): EPRI-CS-5980; ON: TI89000246
• 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
200104 -- Fossil-Fueled Power Plants-- Components
200202* -- Fossil-Fueled Power Plants-- Waste Management-- Noxious Gas & Particulate Emissions
ALLOYS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CIRCULATING SYSTEMS
CLEANING
CORROSION
CORROSION RESISTANT ALLOYS
DATA
DESIGN
DESULFURIZATION
DOCUMENT TYPES
ENERGY RECOVERY
EXPERIMENTAL DATA
FLUE GAS
FOSSIL-FUEL POWER PLANTS
GASEOUS WASTES
HEAT EXCHANGERS
HEAT RECOVERY
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
NUMERICAL DATA
POWER PLANTS
PROGRESS REPORT
RECOVERY
SCRUBBING
STAINLESS STEELS
STEELS
TEMPERATURE EFFECTS
THERMAL POWER PLANTS
TUBES
WASTES