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Numerical simulation of pulverized wet coal combustion using detailed chemical kinetics

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Abstract

A mathematical model for pulverized wet coal combustion is presented. A new detailed kinetic mechanism composed of 500 reactions an 88 species was established. The mass transfer in reacting flow was simulated by including reactions in the kinetic mechanism. The results obtained were compared to numerical and experimental published data and demonstrated a good performance of large mechanisms, in which the model detected the presence of great amounts of the sulfuric species. As for moisture, it always should be treated as an uncoupled phenomenon from devolatilization. Tests were carried out to determine the release of moisture together with volatile matter and demonstrated great changes in the energy and kinetics of the system. The presence of moisture favors the overlapping between devolatilization and heterogeneous combustion. Emissions of SO2, CO and NO are significantly reduced with the increase of moisture in the coal particle, but the H2SO molar fraction is increased.

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Abbreviations

A :

Area [m2], pre-exponential factor [s −1]

C :

Concentration [gmol cm−3]

C p :

Heat capacity [J kg−1 K −1]

C S :

Heat capacity of “s” matter [J kg−1 K −1]

D ef :

Effective diffusion coefficient [m−2 s−1]

d p :

Particle diameter [m]

E :

Activation energy [J kmol−1]

g a :

Water mass fraction inside the particle

G p :

Particle mass flow per unit area [kg m−2 s−1]

G g :

Gas mass flow per unit area [kg m−2 s−1]

\(G_{\Upsigma}\) :

Total mass flow per unit area [kg m−2 s−1]

\(\overline{G}_{\rm a}\) :

Normalized water mass flow

\(\overline{G}_{\rm C}\) :

Normalized carbon mass flow

\(\overline{G}_{\rm R}\) :

Normalized ash mass flow

\(\overline{G}_{\rm V}\) :

Normalized volatile mass flow

\(\overline{h}\) :

Equivalent heat transfer coefficient [J m−2s−1K−1]

H s :

Enthalpy [J kg−1 m−2]

\(\Updelta H\) :

Heat formation [J kg−1]

k j :

Reaction constant in “j” reaction (Arrhenius)

L :

Latent heat [J kg−1]

L a :

Water latent heat [J kg−1]

L V :

Vaporization latent heat [J kg−1]

m :

Mass [kg], amount of reactions, number of reverse reactions

m i :

Mass of the “i” species [kg]

m p :

Mass of particle [kg]

n :

Number of species

n i :

Number of moles of the “i” species

N p :

Number of coal particles per unit volume [m−3]

P :

Pressure [Pa]

r :

Radius [m]

r i :

Molar fraction of “i” species

R 0 :

Ideal gas constant [J kmol−1 K −1]

t :

Time [s]

T :

Temperature [K]

T ap :

Reference temperature [K]

W :

Flow velocity [m s −1]

x :

Position along the channel [m]

Y :

Mass fraction

δ* :

Thickness of the film [equal of d p /4]

ɛ:

Emissivity

φ:

Ratio of CO and CO2 formation

νij :

Stoichiometric coefficient of “i” species in “j” reaction

μi :

Molecular mass of the “i” species [kg kmol−1]

ρ:

Density [kg m−3]

σ:

Stefan-Boltzmann Constant [W m−2 K−4]

a:

Water

C:

Carbon

g:

Gas

p:

Particle

q:

q species present in “j” reaction

R:

Ashes

s:

Constituent of particle, solid state

sat:

Saturated

V:

Volatiles

W:

Wall

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Acknowledgments

The authors wish to thank the University of Planalto Catarinense, the State University of Santa Catarina, the Federal University of Santa Catarina and the Russian Foundation for Basic Research (No. 13-08-97070) for their financial support.

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Authors and Affiliations

  1. State University of Santa Catarina, Lages, Santa Catarina, Brazil

    Valdeci José Costa

  2. Kazan State Technical University-KSTU, Tatarstan, Russia

    Viktor Georgevith Krioukov

  3. Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil

    Clóvis Raimundo Maliska

Authors
  1. Valdeci José Costa
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  2. Viktor Georgevith Krioukov
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  3. Clóvis Raimundo Maliska
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Correspondence to Valdeci José Costa.

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Technical Editor: Luis Fernando Figueira da Silva.

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Costa, V.J., Krioukov, V.G. & Maliska, C.R. Numerical simulation of pulverized wet coal combustion using detailed chemical kinetics. J Braz. Soc. Mech. Sci. Eng. 36, 661–672 (2014). https://doi.org/10.1007/s40430-014-0134-2

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