A proposed maceral index to predict combustion behavior of coal

✍ Scribed by S. Su; J.H. Pohl; D. Holcombe; J.A. Hart

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 110 KB
• Volume: 80
• Category: Article
• ISSN: 0016-2361
• DOI: 10.1016/s0016-2361(00)00137-x

✦ Synopsis

To predict the combustion performance in pulverized coal-®red boilers, this paper examines existing indices and develops a maceral index (MI). These indices were compared with the data of 68 coals and blends in a range of the mean vitrinite re¯ectance from 0.25 to 1.63. The results showed that the fuel ratio and the mean vitrinite re¯ectance could qualitatively indicate the burnout of the coals and blends. The new MI,

MI

L 1 V=R 2 I 1:25 HV 30 2:5 ;

provides a useful correlation for the burnout of the coals and blends. The correlation coef®cient (r 2 ) is 0.982 for the EER data, and 0.808 for the ACIRL data. The MI also has potential to correlate ignition and ¯ame stability of the coals and blends. The MI predicts the burnout better than the other indices.