A comparison of simple global kinetic models for coal devolatilization with the CPD model [electronic resource]

• Ngôn ngữ: eng
• Ký hiệu phân loại: 622.33 *Carbonaceous materials
• Thông tin xuất bản: Washington, D.C. : Oak Ridge, Tenn. : United States. National Nuclear Security Administration ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2016
• Mô tả vật lý: Size: p. 171-180 : , digital, PDF file.
• Bộ sưu tập: Metadata
• ID: 267778
• Chủ đề: 1. 01 coal, lignite, and peat; 2. 20 fossil-fueled power plants; 3. 97 mathematics and computing; 4. Coal pyrolysis; 5. Coal-fired boilers

Tóm tắt

 Simulations of coal combustors and gasifiers generally cannot incorporate the complexities of advanced pyrolysis models, and hence there is interest in evaluating simpler models over ranges of temperature and heating rate that are applicable to the furnace of interest. In this paper, six different simple model forms are compared to predictions made by the Chemical Percolation Devolatilization (CPD) model. The model forms included three modified one-step models, a simple two-step model, and two new modified two-step models. These simple model forms were compared over a wide range of heating rates (5 � 10<
 sup>
 3<
 /sup>
  to 10<
 sup>
 6<
 /sup>
  K/s) at final temperatures up to 1600 K. Comparisons were made of total volatiles yield as a function of temperature, as well as the ultimate volatiles yield. Advantages and disadvantages for each simple model form are discussed. In conclusion, a modified two-step model with distributed activation energies seems to give the best agreement with CPD model predictions (with the fewest tunable parameters).