Journal
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
Volume 109, Issue 1, Pages 403-412Publisher
SPRINGER
DOI: 10.1007/s10973-011-1556-z
Keywords
Biomass; Co-combustion; Capsicum stalk; Thermogravimetric
Funding
- Natural Science Funds of China [50976086]
- ESPRC [EP/F061188/1]
- China Scholarship Council
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The combustion kinetics of waste capsicum stalk (WCS) in Western China is investigated through thermogravimetric analysis compared with sawdust and coal, and co-combustion of WCS with coal is also investigated. Results show that the ignition characteristics of WCS is better than that of sawdust and coal, and the activation energy E of WCS-volatile combustion and WCS-char combustion are 78.55 kJ mol(-1) and 44.59 kJ mol(-1). However, integrating the characteristics of ignition and burnout, the combustion characteristic factor (S-N) of WCS is lower than that of sawdust. With the increasing in the heating rate, the ignition of WCS is delayed. Oxygen concentration C-O2 affects E and k(0) of volatile combustion largely under rich-oxygen condition, when C-O2 increases from 0.2 to 0.8, E has increased threefold and k(0) also intensively increases from 10(6) to 10(13)-10(22). Oppositely, effect of C-O2 on the E and k(0) of char combustion is little, and there is an exponential relationship S-N = 7.128 x 10(-9) x exp(C-O2/0.368) - 6.126 x 10(-9) between S-N and C-O2. For the tests of co-combustion, all the experimental and weighted-average curves coincide well, and there is no remarkable synergistic effect. With the increase of mixing ratio that WCS added, E and k(0) of volatile combustion increase, but correspondingly E and k(0) of char combustion decrease.
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