An investigation of the combustion of pulverized coal-air mixture in different combustor geometries

Journal Article · Tue Sep 01 00:00:00 EDT 1992 · Combustion and Flame; (United States)

DOI:https://doi.org/10.1016/0010-2180(92)90092-4· OSTI ID:7033183

Ji, C C ^[1]; Cohen, R D ^[2]

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1. Dept. of System Engineering, Chung Cheng Inst. of Technology, Ta-Hsi, Tao-Yuan (TW)
2. Dept. of Mechanical Engineering and Materials Science, Rice Univ., Houston, TX (US)

In this paper a two-dimensional theoretical study of the flow and combustion of pulverized coal by diffusion flames is presented. The model predicts gas flows, species concentrations, and temperatures in combustors having specific geometries. The conservation equations are solved utilizing the {kappa}-{epsilon} turbulence model. coal devolatilization is modeled by the two-competing-reactions scheme, which generates two sets of volatiles and char, each by a specific rate constant, described in Arrhenius form. Char combustion form devolatilization occurs by reaction with oxygen, carbon dioxide, water, particle dispersion, and radiative heat transfer between furnace wall and particles. The model is used to investigate the interaction between flow and combustion in flames produced by arranging the locations of the primary inlet and the secondary air inlets in a furnace. The predictions, which could be valuable for designing furnaces, indicate that a centered primary inlet and a minimum recirculation are some of the criteria that could be favorable for combustion.

• OSTI ID: 7033183
• Journal Information: Combustion and Flame; (United States), Journal Name: Combustion and Flame; (United States) Vol. 90:3; ISSN 0010-2180; ISSN CBFMA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
& Peat-- Combustion
42 ENGINEERING
421000 -- Engineering-- Combustion Systems
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
AIR
ARRHENIUS EQUATION
BINARY MIXTURES
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COAL
COMBUSTION
COMBUSTORS
CONCENTRATION RATIO
DESIGN
DEVOLATILIZATION
DISPERSIONS
ELEMENTS
ENERGY SOURCES
ENERGY TRANSFER
EQUATIONS
FLAME PROPAGATION
FLUID FLOW
FLUIDS
FOSSIL FUELS
FUELS
FURNACES
GAS FLOW
GASES
GEOMETRY
HEAT TRANSFER
MATERIALS
MATHEMATICAL MODELS
MATHEMATICS
MIXTURES
NONMETALS
OXIDATION
OXYGEN
PULVERIZED FUELS
RADIANT HEAT TRANSFER
TEMPERATURE DISTRIBUTION
THERMOCHEMICAL PROCESSES
TURBULENCE
TWO-DIMENSIONAL CALCULATIONS