Comparison of biomass and coal char reactivities Page: 4 of 6
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temperature). The temporal data are normalized by the time at which near-extinction (in the case of the
higher rank coals) or extinction (in the case of lower rank coals and biohass chars) of the combustion
process occurs. These extinction (and near-extinction) times correspond to the inflection point in the
temperature-time profile that occurs after the peak temperature.
Using the CPI, normalized temperature-time profiles of several coal chars and solid biomass-derived
fuels were determined for at least 20 particles of each type. Figures 2, 3, and 4 present the normalized
temperature-time profiles-for bituminous and high-rank coal chars (Illinois #6 and Pocahontas #3), low-
rank coal chars (Beulah and Dietz), and biomass chars (pine and switchgrass), respectively. The figures
show that for all the chars the particle temperature increases to a maximum and decreases to the reactor
temperature, nominally 1600 K. The high nominal reactor gas temperature explains why the normalized
particle temperatures are never less than 0.7.
- E 0.95
- 0.8 Illinois #6
0. -U- Pocahontas #3
0 0.5 1 1.5 2 2.5 3
time / extinction time
Figure 2. Normalized Temperature versus Normalized Time
for Bituminous and High-Rank Coals
o o.5 1 1.5 2 2.5 3
time / extinction time
Figure 3. Normalized Temperature versus Normalized Time for Low-Rank Coals
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Huey, S.P.; Davis, K.A. & Hurt, R.H. Comparison of biomass and coal char reactivities, article, August 1, 1995; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc627637/m1/4/: accessed September 26, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.