In this paper, different rates of steam flow (swing rates) are used to demonstrate the transient changes in both the drum-boiler steam pressure and the wall temperature levels in addition to stresses in the walls of steam risers. A MATLAB code was written to integrate the nonlinear dynamic governing equations for solving the water volume, the drum pressure, and the steam quality at the exit of the riser tubes. The same code is also used for calculating the steam riser inner and outer wall temperatures based on the inner wall heat transfer coefficient. The temporal riser pipe pressure and the inner and outer pipe wall temperatures have been incorporated into an ANSYS model for calculating the effective combined thermal and pressure-caused stresses numerically. The combined effective stress fluctuation for the highest swing rate (40%) is found to be too low to induce any damage in the riser tube. The controlled pressure level has been compared with an actual pressure reading from an existing drum boiler under operating conditions for the purpose of validating the control parameters employed in the study. An optimization method for reducing the steam pressure overshoot level in the boiler is also proposed.
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e-mail: mahabib@kfupm.edu.sa
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December 2010
Research Papers
Influence of Boiler Load Swing Rates on Effective Stresses of Drum Boiler Riser Tubes
M. A. Habib,
M. A. Habib
Department of Mechanical Engineering,
e-mail: mahabib@kfupm.edu.sa
King Fahd University of Petroleum and Minerals
, Dhahran 31261, Saudi Arabia
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I. Al-Zaharnah,
I. Al-Zaharnah
Department of Mechanical Engineering,
King Fahd University of Petroleum and Minerals
, Dhahran 31261, Saudi Arabia
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M. El-Shafei,
M. El-Shafei
Department of Mechanical Engineering,
King Fahd University of Petroleum and Minerals
, Dhahran 31261, Saudi Arabia
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S. A. M. Said,
S. A. M. Said
Department of Mechanical Engineering,
King Fahd University of Petroleum and Minerals
, Dhahran 31261, Saudi Arabia
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N. Merah,
N. Merah
Department of Mechanical Engineering,
King Fahd University of Petroleum and Minerals
, Dhahran 31261, Saudi Arabia
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S. Al-Anizi,
S. Al-Anizi
Department of Consulting Services,
Saudi Aramco
, Dhahran 31311, Saudi Arabia
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M. Y. Al-Awwad,
M. Y. Al-Awwad
Department of Consulting Services,
Saudi Aramco
, Dhahran 31311, Saudi Arabia
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M. Hajji
M. Hajji
Department of Consulting Services,
Saudi Aramco
, Dhahran 31311, Saudi Arabia
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M. A. Habib
Department of Mechanical Engineering,
King Fahd University of Petroleum and Minerals
, Dhahran 31261, Saudi Arabiae-mail: mahabib@kfupm.edu.sa
I. Al-Zaharnah
Department of Mechanical Engineering,
King Fahd University of Petroleum and Minerals
, Dhahran 31261, Saudi Arabia
M. El-Shafei
Department of Mechanical Engineering,
King Fahd University of Petroleum and Minerals
, Dhahran 31261, Saudi Arabia
S. A. M. Said
Department of Mechanical Engineering,
King Fahd University of Petroleum and Minerals
, Dhahran 31261, Saudi Arabia
N. Merah
Department of Mechanical Engineering,
King Fahd University of Petroleum and Minerals
, Dhahran 31261, Saudi Arabia
S. Al-Anizi
Department of Consulting Services,
Saudi Aramco
, Dhahran 31311, Saudi Arabia
M. Y. Al-Awwad
Department of Consulting Services,
Saudi Aramco
, Dhahran 31311, Saudi Arabia
M. Hajji
Department of Consulting Services,
Saudi Aramco
, Dhahran 31311, Saudi ArabiaJ. Pressure Vessel Technol. Dec 2010, 132(6): 061301 (8 pages)
Published Online: October 20, 2010
Article history
Received:
July 27, 2009
Revised:
April 21, 2010
Online:
October 20, 2010
Published:
October 20, 2010
Citation
Habib, M. A., Al-Zaharnah, I., El-Shafei, M., Said, S. A. M., Merah, N., Al-Anizi, S., Al-Awwad, M. Y., and Hajji, M. (October 20, 2010). "Influence of Boiler Load Swing Rates on Effective Stresses of Drum Boiler Riser Tubes." ASME. J. Pressure Vessel Technol. December 2010; 132(6): 061301. https://doi.org/10.1115/1.4001653
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