Simulated fireside corrosion of T91 in oxy-combustion systems with an emphasis on coal/biomass environments [electronic resource]

• Ngôn ngữ: eng
• Ký hiệu phân loại: 620.1937 Engineering mechanics and materials
• Thông tin xuất bản: Washington, D.C. : Oak Ridge, Tenn. : United States. Office of the Assistant Secretary of Energy for Fossil Energy ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2019
• Mô tả vật lý: Size: p. 437-446 : , digital, PDF file.
• Bộ sưu tập: Metadata
• ID: 267715
• Chủ đề: 1. 01 coal, lignite, and peat; 2. 09 biomass fuels; 3. 54 environmental sciences; 4. Fireside corrosion; 5. Oxidation

Tóm tắt

 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 N<
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  and potentially higher SO<
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  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.