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Evaluation on oxy-fuel co-combustion behavior of Chinese lignite and eucalyptus bark

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Abstract

The combustion behaviors of lignite/eucalyptus bark under oxy-fuel condition were assessed based on a thermal analysis technique. The influences of oxygen concentration, heating rates and blending ratios on oxy-fuel combustion performances were revealed, which were compared with those in air. The ignition and comprehensive combustion indices increased with increasing oxygen contents during oxy-fuel combustion. At three heating rates of 10, 15 and 20 K min−1, the average comprehensive performance indices of lignite/eucalyptus bark in 40 %O2/60 %CO2 were about 5–7 times more than those in air. The average comprehensive performance indices of lignite/eucalyptus bark in air were about 2–3 times more than those in O2/CO2 atmosphere at analogous oxygen content. At heating rate of 20 K min−1, the ignition and comprehensive performance indices of lignite/eucalyptus bark in 25 %O2/75 %CO2 were very near to those in air. The combustion kinetics were also evaluated in conjunction with volatile matter and fixed carbon burning periods using Doyle’s and Coats–Redfern’s models. The oxy-fuel combustion kinetics of lignite/eucalyptus bark at oxygen content of 30 % was similar to that in air. There were more significant synergistic effects between lignite and eucalyptus bark during their co-combustion in air and O2/CO2 with oxygen contents of 25 and 30 %.

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Abbreviations

a :

Conversion degree

A :

The pre-exponential (s−1)

D :

Combustion index

E a :

Apparent activation energy (J mol−1)

R :

The 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 & Xingquan You

  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 & Xingquan You

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

    Feng Xue

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  1. Yuanhang Wei
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Correspondence to Meiqian Chen.

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Wei, Y., Chen, M., Niu, S. et al. Evaluation on oxy-fuel co-combustion behavior of Chinese lignite and eucalyptus bark. J Therm Anal Calorim 123, 1667–1684 (2016). https://doi.org/10.1007/s10973-015-5050-x

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