Journal
APPLIED THERMAL ENGINEERING
Volume 152, Issue -, Pages 137-146Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2019.02.026
Keywords
Lignite; Humus; Co-combustion; Synergy; Kinetic model
Funding
- Natural Science Foundation of China
- Program of Henan Post-doctoral Foundation [2015003]
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The co-combustion of lignite with humus was investigated as an effective way to mitigate carbon emission. The thermal characteristics of the co-combustion were successfully evaluated, which was the prerequisite for predicting synergy and blending optimization of this process. A novel synergy index (SI) was proposed to quantify the synergetic effect and differentiate the effect of minerals and organics in humus during co-combustion. The non-catalytic synergy of organics (SI = 1.76) was stronger than the catalytic synergy of minerals (SI = 1.55) for the 20 wt% humus blend. However, catalytic synergy was more dominant at high humus blending ratios. The kinetic parameters were estimated through two model-free methods. The activation energy of the blend by Kissinger-Akahira-Sunose and Flynn-Wall-Ozawa methods was 104.99 and 110.71 kJ/mol, respectively. The more precise kinetic model of the blend was determined by master-plots method. This study also demonstrated that humus could be used as a potential fuel in co-combustion system.
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