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Experimental investigation on the oxy-fuel co-combustion behavior of anthracite coal and spent coffee grounds

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Abstract

The combustion behaviors of anthracite coal/spent coffee grounds under oxy-fuel condition were assessed by a thermal analysis technique. At heating rates of 10–40 K min−1, the ignition temperatures and burnout temperatures of all anthracite coal/spent coffee grounds blends decreased with increasing the blending ratios of biomass or oxygen contents in O2/CO2 atmospheres. The ignition temperatures of all samples at the similar oxygen content in oxy-fuel with that of air were higher than that in air atmosphere. In 30 % O2/70 % CO2 atmosphere, the average ignition and comprehensive performance indices of anthracite coal/spent coffee grounds at 40 K min−1 were about 4 times and 18 times more than that at 10 K min−1, respectively. At heating rate of 20 K min−1, the comprehensive performance indices of all samples in 30 % O2/70 % CO2 were very close to those in air. In air and O2/CO2 (21–40 % oxygen contents) atmospheres, the activation energies of release and combustion for volatile matters in the blends ranged from 33.66 to 147.32 kJ mol−1. Activation energies of char combustion in the blends ranged from 21.06 to 109.49 kJ mol−1. There were more significant synergistic effects between anthracite coal and spent coffee grounds during co-combustion in air and oxy-fuel atmospheres at 40 K min−1.

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Abbreviations

a :

Conversion degree

A :

Pre-exponential (s−1)

D :

Combustion index

E a :

Apparent activation energy (J mol−1)

R :

Universal gas constant (J mol−1 K−1)

T :

Temperature (K/°C)

β :

Heating rate (K min−1)

b:

Burnout

c:

Comprehensive performance

i:

Ignition

m:

Mean

max:

Maximum

p:

Peak

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Acknowledgements

This work was supported by the National Natural Science Foundation of China under No. 51376017 and the Fundamental Research Funds of China for the Central Universities under No. 2015YJS133.

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Authors and Affiliations

  1. Institute of Thermal Engineering, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing, 100044, China

    Yuanhang Wei, Meiqian Chen & Shibo Niu

  2. Beijing Key Laboratory of Flow and Heat Transfer of Phase Changing in Micro and Small Scale, Beijing, 100044, China

    Yuanhang Wei, Meiqian Chen & Shibo Niu

  3. Guodian Science and Technology Research Institute, Nanjing, 210033, China

    Feng Xue

Authors
  1. Yuanhang Wei
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Correspondence to Meiqian Chen.

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Wei, Y., Chen, M., Niu, S. et al. Experimental investigation on the oxy-fuel co-combustion behavior of anthracite coal and spent coffee grounds. J Therm Anal Calorim 124, 1651–1660 (2016). https://doi.org/10.1007/s10973-016-5269-1

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  • DOI: https://doi.org/10.1007/s10973-016-5269-1

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