Multisystem corrosion monitoring in a cyclic reheat test facility: Phase 1
The work described in this report was the first stage of an EPRI-sponsored corrosion investigation utilizing the CAPCIS electrochemical monitoring system installed in a cyclic reheat test facility on a flue gas slipstream at the Scholz Steam Plant of Gulf Power Company. The primary reasons for incorporating the continuous corrosion monitoring system in the cyclic reheat investigation were that unexpectedly high corrosion rates had been observed in earlier tests at certain locations within the test exchanger and the precise reasons for these high rates of attack were not well understood. The corrosion behavior was not typical of the limited service experience on full scale units and the reasons for this required clarification. Controlled temperature weight loss and electrochemical probes were installed in the unit in place of three of the 1-inch diameter heat exchanger tubes. The corrosion behavior of Inconel Alloy 625 over the temperature range 260/degree/ to 120/degree/F (127/degree/ to 49/degree/C) was evaluated at mid-stream and sidewall locations. The efects on corrosion of operational variables and cleaning procedures were also evaluated. The severe corrosion attack sustained on the Inconel Alloy 625 was proved to result from a combination of effects which included the flue gas flow pattern, local cool-spots within the unit and preferential locations at which ash deposits could accumulate. 5 refs., 50 figs., 17 tabs.
- Research Organization:
- University of Manchester Inst. of Science and Technology (UK). Corrosion and Protection Centre Industrial Services
- OSTI ID:
- 5157784
- Report Number(s):
- EPRI-CS-5776; ON: TI88009302
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
FLUE GAS
HEAT EXCHANGERS
FOSSIL-FUEL POWER PLANTS
CORROSION
ASHES
COOLING
CORROSION RESISTANCE
DATA ACQUISITION SYSTEMS
DEPOSITION
DESULFURIZATION
DEW POINT
DUCTS
HEAT RECOVERY
HEATING
INCONEL 625
INHIBITION
MATERIALS TESTING
MONITORING
SCRUBBERS
TEMPERATURE EFFECTS
TUBES
VAPOR CONDENSATION
WASHING
ALLOYS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CLEANING
ENERGY RECOVERY
EQUIPMENT
GASEOUS WASTES
INCONEL ALLOYS
IRON ALLOYS
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIOBIUM ALLOYS
POLLUTION CONTROL EQUIPMENT
POWER PLANTS
RECOVERY
RESIDUES
TANTALUM ALLOYS
TESTING
THERMAL POWER PLANTS
WASTES
200101* - Fossil-Fueled Power Plants- Cooling & Heat Transfer Equipment & Systems
360105 - Metals & Alloys- Corrosion & Erosion