Fireside Corrosion in Oxy-Fuel Combustion of Coal [electronic resource]

• Ngôn ngữ: eng
• Ký hiệu phân loại: 669 Metallurgy
• 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, 2011
• Mô tả vật lý: Medium: ED : , digital, PDF file.
• Bộ sưu tập: Metadata
• ID: 268451
• Chủ đề: 1. 01 coal, lignite, and peat; 2. Alkali metals; 3. Boilers; 4. Chemistry; 5. Coal

Tóm tắt

 The goal is to develop technologies for pulverized coal boilers with >
 90% CO{sub 2} capture and sequestration and <
 35% increase in the cost of electricity. Air-fired power plant experience shows a corrosion loss max at 680-700 C. Low melting point alkali metal trisulfates, such as (K,Na){sub 3}Fe(SO{sub 4}){sub 3}, become thermally unstable above this temperature range. Some overall conclusions are: (1) CO{sub 2} + 30% H{sub 2}O more corrosive than Ar + 30% H{sub 2}O
  (2) Excess O{sub 2} in H{sub 2}O can, in some cases, greatly increase oxidation
  (3) Coal ash is generally innocuous without SO{sub 3}3 in gas phase
  and (4) Long-term exposures are starting to establish differences between air-firing and oxy-firing conditions.