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Research Papers: Fuel Combustion

Theoretical Analysis on the Constitution of Calorific Values of Biomass Fuels

[+] Author and Article Information
Fengqi Yao

State Key Laboratory of Fire Science,
University of Science and Technology of China,
96 Jinzhai Road,
Hefei 230026, Anhui, China
e-mail: yofulqi@mail.ustc.edu.cn

Haihui Wang

State Key Laboratory of Fire Science,
University of Science and Technology of China,
96 Jinzhai Road,
Hefei 230026, Anhui, China
e-mail: HHWang4@ustc.edu.cn

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received April 4, 2018; final manuscript received July 9, 2018; published online October 4, 2018. Assoc. Editor: Reza Sheikhi.

J. Energy Resour. Technol 141(2), 022207 (Oct 04, 2018) (6 pages) Paper No: JERT-18-1247; doi: 10.1115/1.4041468 History: Received April 04, 2018; Revised July 09, 2018

The present work explored the constitution of the calorific values of biomass fuels and the mechanism by which basic chemical compositions affect the fuel calorific data. For the first time, an energy conversion model was developed for the functional groups stored in biomass fuels by combustion. Validation of the model was performed by testing with various types of substances. By analyzing the effect of mass increase of individual chemical species on the amount of heat released by a fuel, it was confirmed that for ligno-cellulosic fuels, the species containing C–H, C–C and C=C bonds positively affect the fuel calorific values, whereas the species containing O–H, C–N, C–O, and C=O bonds have negative role in the increase of the fuel calorific values. A ratio parameter was then developed to quantitatively evaluate the potential of individual chemical bonds to contribute to the calorific values of biomass fuels, which well explained the existing techniques for treating biomass as fuels. The outcomes of this work serve as a theoretical basis for improving the efficiency in energy utilization of biomass fuels.

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Topics: Fuels , Biomass , Combustion , Heat
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Figures

Grahic Jump Location
Fig. 1

Contribution portions of the functional groups of selected fuels to the fuel heat release by combustion. Calculations were performed by setting the amount of each fuel at 1 mol

Grahic Jump Location
Fig. 2

Increments in the magnitudes of the calorific value of typical biomass fuels as a function of the mass change of individual functional groups stored in the biomass fuels

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