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RESEARCH PAPERS: Combustion and Reactive Flows

Energy and Exergy Balance in the Process of Pulverized Coal Combustion in a Tubular Combustor

[+] Author and Article Information
S. K. Som1

Department of Mechanical Engineering, Indian Institute of Technology, Kharagpur 721302, India

S. S. Mondal, S. K. Dash

Department of Mechanical Engineering, Indian Institute of Technology, Kharagpur 721302, India

1

Corresponding author. E-mail: sksom@mech.iitkgp.ernet.in

J. Heat Transfer 127(12), 1322-1333 (Jul 25, 2005) (12 pages) doi:10.1115/1.2101860 History: Received May 12, 2004; Revised July 25, 2005

A theoretical model of exergy balance, based on availability transfer and flow availability, in the process of pulverized coal combustion in a tubular air-coal combustor has been developed to evaluate the total thermodynamic irreversibility and second law efficiency of the process at various operating conditions. The velocity, temperature, and concentration fields required for the evaluation of flow availability have been computed numerically from a two-phase separated flow model on a Eulerian-Lagrangian frame in the process of combustion of pulverized coal particles in air. The total thermodynamic irreversibility in the process has been determined from the difference in the flow availability at the inlet and outlet of the combustor. A comparative picture of the variations of combustion efficiency and second law efficiency at different operating conditions, such as inlet pressure and temperature of air, total air flow rate and inlet air swirl, initial mean particle diameter, and length of the combustor, has been provided to shed light on the trade-off between the effectiveness of combustion and the lost work in the process of pulverized coal combustion in a tubular combustor.

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Copyright © 2005 by American Society of Mechanical Engineers
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Figures

Grahic Jump Location
Figure 2

Comparison of axial and tangential velocity components for a coaxial counter swirling axisymmetric confined flow with the experimental result of Vu and Gouldin (46)

Grahic Jump Location
Figure 3

Temporal histories of axial displacement of coal particles in the combustor at different inlet air pressure (S=0.0,Tin=600K,ṁain=0.042kg∕s,ṁfin=0.004kg∕s,SMDi=50μm)

Grahic Jump Location
Figure 4

Temporal mass depletion histories of coal particles in the combustor at different inlet air pressure (S=0.0,Tin=600K,ṁain=0.042kg∕s,ṁfin=0.004kg∕s,SMDi=50μm)

Grahic Jump Location
Figure 5

Trajectories of pulverized coal particles in the combustor (pin=1.0bar,S=0.0,Tin=600K,ṁain=0.042kg∕s,ṁfin=0.004kg∕s,SMDi=50μm)

Grahic Jump Location
Figure 6

Gas phase velocity field in the combustor (pin=1.0bar,S=0.0,Tin=600K,ṁain=0.042kg∕s,ṁfin=0.004kg∕s,SMDi=50μm)

Grahic Jump Location
Figure 7

Gas phase velocity field in the combustor with inlet air swirl (pin=1.0bar,S=0.77,Tin=600K,ṁain=0.042kg∕s,ṁfin=0.004kg∕s,SMDi=50μm)

Grahic Jump Location
Figure 8

Trajectories of pulverized coal particles at higher inlet air temperature (S=0.0,pin=1.0bar,Tin=1000K,ṁain=0.042kg∕s,ṁfin=0.004kg∕s,SMDi=50μm)

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