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Devolatilization Characteristics and Kinetic Analysis of Lump Coal from China COREX3000 Under High Temperature

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Abstract

A devolatilization study of two lump coals used in China COREX3000 was carried out in a self-developed thermo-gravimetry at four temperature conditions [1173 K, 1273 K, 1373 K, and 1473 K (900 °C, 1000 °C, 1100 °C, and 1200 °C)] under N2. This study reveals that the working temperature has a strong impact on the devolatilization rate of the lump coal: the reaction rate increases with the increasing temperature. However, the temperature has little influence on the maximum mass loss. The conversion rate curve shows that the reaction rate of HY lump coal is higher than KG lump coal. The lump coals were analyzed by XRD, FTIR, and optical microscopy to explore the correlation between devolatilization rate and properties of lump coal. The results show that the higher reaction rate of HY lump coal attributes to its more active maceral components, less aromaticity and orientation degree of the crystallite, and more oxygenated functional groups. The random nucleation and nuclei growth model (RNGM), volume model (VM), and unreacted shrinking core model (URCM) were employed to describe the reaction behavior of lump coal. It was concluded from kinetics analysis that RNGM model was the best model for describing the devolatilization of lump coals. The apparent activation energies of isothermal devolatilization of HY lump coal and KG lump coal are 42.35 and 45.83 kJ/mol, respectively. This study has implications for the characteristics and mechanism modeling of devolatilization of lump coal in COREX gasifier.

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Abbreviations

XRD:

X-ray diffraction

FTIR:

Fourier transform infrared spectroscopy

RNGM:

Random nucleation and nuclei growth model

VM:

Volume model

URCM:

Unreacted shrinking core model

\( \frac{{{\text{d}}\alpha }}{{{\text{d}}t}} \) :

Reaction conversion rate (s−1)

k(T):

The reaction rate constant

f(α):

The devolatilization mechanism function

t :

Devolatilization time (s)

α :

Devolatilization conversion

A :

The pre-exponential factor (s−1)

E :

The activation energy (kJ/mol)

R:

The universal gas constant (kJ/(mol K))

m i :

The initial weight of lump coal (g)

m t :

The instant weight of the sample during experiment (g)

m ∞ :

The sample weight after experiment (g)

k RNGM :

The reaction rate constant of random nucleation and nuclei growth model

k VM :

The reaction rate constant of volume model

k URCM :

The reaction rate constant of unreacted shrinking core model

\( \left( {\frac{{{\text{d}}\alpha }}{{{\text{d}}t}}} \right)_{\exp ,i} \) :

Reaction conversion rate based on the experiment data

\( \left( {\frac{{{\text{d}}\alpha }}{{{\text{d}}t}}} \right)_{{{\text{calc}},i}} \) :

Reaction conversion rate based on the experiment data

i :

The reaction temperature (K)

DEV(α):

Relative error (pct)

α exp,i :

Experiment devolatilization conversion data

α calc,i :

Calculated devolatilization conversion data

max(α)exp :

The maximum conversion of experiment

N :

The number of experiment dada

K1 :

Correction coefficient

A 002 :

The area of (002) band

A γ :

The area of γ band

B 002 :

The half width of (002) band (deg)

ϕ 002 :

The diffraction angle of (002) band (deg)

λ :

The wavelength of incident rays, nm

θ 100 :

The diffraction angle of (100) band (deg)

β 100 :

THE half width of (100) band (deg)

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Acknowledgments

The authors acknowledge the financial support for this work provided by the National Basic Research Program of China (973 Program) (No. 2012CB720401), National Natural Science Foundation of China (No. 51574023), and National Key technology R&D Program of China (No. 2011BAC01B02).

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Authors and Affiliations

  1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Runsheng Xu (Ph.D. Candidate), Jianliang Zhang (Professor), Guangwei Wang (Lecturer), Zhengjian Liu (Lecturer), Kexin Jiao (Lecturer), Yanxiang Liu (Ph.D. Candidate) & Kejiang Li (Ph.D. Candidate)

  2. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083, China

    Haibin Zuo (Associate Professor)

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  1. Runsheng Xu
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  2. Jianliang Zhang
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Correspondence to Jianliang Zhang.

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Manuscript submitted October 14, 2015.

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Xu, R., Zhang, J., Wang, G. et al. Devolatilization Characteristics and Kinetic Analysis of Lump Coal from China COREX3000 Under High Temperature. Metall Mater Trans B 47, 2535–2548 (2016). https://doi.org/10.1007/s11663-016-0708-8

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