Simulated fireside corrosion of T91 in oxy-combustion systems with an emphasis on coal/biomass environments
- National Energy Technology Lab. (NETL), Albany, OR (United States). Structural Materials Team, Materials Engineering & Manufacturing Directorate
- Leidos Research Support Team, Pittsburgh, PA (United States)
- Cranfield Univ., Bedfordshire (United Kingdom). Centre for Thermal Energy Systems and Materials
Oxy-combustion is the burning of a fuel in oxygen rather than air for the ease of capture of CO2 for reuse or sequestration. Corrosion issues associated with the change in heat exchanger tube operating environment (replacement of most of the N2 with CO2 and potentially higher SOx levels) from air- to oxy-combustion were examined. The ferritic-martensitic alloy T91 was used in accelerated fireside corrosion tests using several different gas compositions and ash deposit overcoats to simulate air-fired, oxy-fired coal, and oxy-fired co-fired coal/biomass conditions. Initial corrosion was observed after 240 h of exposure by examining cross-sections with retained ash. Metal section losses were determined after exposures of up to 1440 h at 600-700 °C. Severe corrosion was observed, and a corrosion response with respect to ash deposit chemistry was observed. Corrosion response differences with respect to gas phase chemistry were minimal. Alloy-oxide scale-ash morphologies were consistent with oxide fluxing mechanisms.
- Research Organization:
- National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
- Sponsoring Organization:
- USDOE Office of Fossil Energy (FE)
- Grant/Contract Number:
- FE0004000
- OSTI ID:
- 1810058
- Journal Information:
- Materials at High Temperatures, Vol. 36, Issue 5; ISSN 0960-3409
- Publisher:
- Maney PublishingCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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