A kinetic evaluation on NO<sub>2</sub> formation in the post-flame region of pressurized oxy-combustion process [electronic resource]

 0 Người đánh giá. Xếp hạng trung bình 0

Tác giả:

Ngôn ngữ: eng

Ký hiệu phân loại: 546.22 Water

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, 2021

Mô tả vật lý: Size: p. 2609-2620 : , digital, PDF file.

Bộ sưu tập: Metadata

ID: 267870

 Pressurized oxy-combustion is a promising technology that can significantly re-duce the energy penalty associated with first generation oxy-combustion for CO<
 sub>
 2<
 /sub>
  capture in coal-fired power plants. However, higher pressure enhances the production of strong acid gases, including NO<
 sub>
 2<
 /sub>
  and SO<
 sub>
 3<
 /sub>
 , aggravating the corrosion threat during flue gas re-circulation. In the flame region, high temperature NO<
 sub>
 x<
 /sub>
  exists mainly as NO, while conversion from NO to NO<
 sub>
 2<
 /sub>
  happened in post-flame region. In this study, the conversion of NO ? NO<
 sub>
 2<
 /sub>
  has been kinetically evaluated under representative post-flame conditions of pressurized oxy-combustion after validating the mechanism (80 species and 464 reactions), which includes nitrogen and sulfur chemistry based on GRI-MECH 3.0. The effects of residence time, temperature, pressure, major species (O<
 sub>
 2<
 /sub>
 /H<
 sub>
 2<
 /sub>
 O), and minor or trace species (CO/SO<
 sub>
 x<
 /sub>
 ) on NO<
 sub>
 2<
 /sub>
  formation are studied. The calculation results show that when pressure is increased from 1 to 15 bar, NO<
 sub>
 2<
 /sub>
  is increased from 1 to 60 ppm, and the acid dew point increases by over 80�C. Higher pressure and temperature greatly reduce the time required to reach equilibrium. With increasing pressure and decreasing temperature, O plays a much more important role than HO<
 sub>
 2<
 /sub>
  in the oxidation of NO. A higher water vapor content accelerates NO<
 sub>
 2<
 /sub>
  formation in all cases by providing more O and HO<
 sub>
 2<
 /sub>
  radicals. The addition of CO or SO<
 sub>
 2<
 /sub>
  also promotes the formation of NO<
 sub>
 2<
 /sub>
 . The NO<
 sub>
 2<
 /sub>
  formation in a pressurized oxy-combustion furnace can be over 10 times that of an atmospheric air-combustion furnace.
Tạo bộ sưu tập với mã QR

THƯ VIỆN - TRƯỜNG ĐẠI HỌC CÔNG NGHỆ TP.HCM

ĐT: (028) 71010608 | Email: tt.thuvien@hutech.edu.vn

Copyright @2024 THƯ VIỆN HUTECH