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RESEARCH PAPERS

Modeling of a Coal-Fired Natural Circulation Boiler

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

Department of Mechanical Engineering, Indian Institute of Technology Bombay, Mumbai, 400076, India

Sushanta K. Mitra1

Department of Mechanical Engineering, Indian Institute of Technology Bombay, Mumbai, 400076, Indiaskmitra@me.iitb.ac.in

U. N. Gaitonde

Department of Mechanical Engineering, Indian Institute of Technology Bombay, Mumbai, 400076, India

1

Corresponding author.

J. Energy Resour. Technol 129(2), 159-167 (Apr 01, 2006) (9 pages) doi:10.1115/1.2719209 History: Received May 02, 2005; Revised April 01, 2006

Modeling of a natural circulation boiler for a coal-fired thermal power station is presented here. The boiler system is divided into seven subcomponents, and for each section, models based on conservation of mass, momentum, and energy are formulated. The pressure drop at various sections and the heat transfer coefficients are computed using empirical correlations. Solutions are obtained by using SIMULINK . The model is validated by comparing its steady state and dynamic responses with the actual plant data. Open loop responses of the model to the step changes in the operating parameters, such as pressure, temperature, steam flow, feed water flow, are also analyzed. The present model can be used for the development and design of effective boiler control systems.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Block diagram of the boiler system

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Figure 2

Schematic of a boiler drum

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Figure 3

Response of mass flowrate in the downcomer-riser loop

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Figure 4

Effect of ramp increase in pressure on circulation rate

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Figure 5

Effect of 10% increase in dryness fraction on circulation rate

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Figure 6

Effect of step decrease in gas temperature from 1290°Cto1280°C

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Figure 7

Effect of step decrease in pressure by 10%

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Figure 8

Effect of step increase in gas temperature by 15°C

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Figure 9

Effect of step increase in boiler steam flow by 5%

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Figure 10

Effect of step increase in boiler feed water flow by 5%

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Figure 11

Simulated main steam pressure in response to the steam pressure set-point change by 5kg∕cm2

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Figure 12

Simulated drum pressure in response to the steam pressure set-point change by 5kg∕cm2

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