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Research Papers: Design and Analysis

Heat Transfer and Stress Analysis of Coke Drum for a Complete Operating Cycle

[+] Author and Article Information
Zihui Xia1

Department of Mechanical Engineering, University of Alberta, Edmonton, AB, T6G 2G8, Canadazihui.xia@ualberta.ca

Feng Ju

Department of Mechanical Engineering, University of Alberta, Edmonton, AB, T6G 2G8, Canada

Pierre Du Plessis

 Suncor Energy Services Inc., P.O. Box 4001, Fort McMurra, AB, T9H 3E3, Canada

1

Corresponding author.

J. Pressure Vessel Technol 132(5), 051205 (Aug 31, 2010) (9 pages) doi:10.1115/1.4001208 History: Received June 30, 2009; Revised December 14, 2009; Published August 31, 2010; Online August 31, 2010

Coke drums experience severe thermal and mechanical loadings during operation, and the reliability and safety of the coke drums are critical to the industry. The objective of this study is to analyze temperature and stress of the coke drum for a complete process cycle. The thermal analysis model of the coke drum is first developed incorporating appropriate boundary conditions. The heat transfer coefficients at the inner surface of the coke drum, which change with the operation stages and the levels of oil filling and water quenching, are determined based on the temperature measurement data at a certain location on the outer surface of the coke drum. The temperature history of the coke drum of a complete cycle is then obtained by finite element heat transfer analysis, and computed temperature data are used for the stress analysis of the coke drum, including both thermal and mechanical loadings. It is found from numerical results that the clad experiences a biaxial stress cycling with maximum value higher than the yield limit of the material, which coincide with the low cycle fatigue failure of the structure.

Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Coke drum model and data point locations

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Figure 2

Coefficient of the thermal expansion versus temperature

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Figure 3

Elastic modulus versus temperature

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Figure 4

Measured temperature history of the coke drum (case A)

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Figure 5

Measured temperature history of the coke drum (case B)

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Figure 6

1D thermal models for the coke drum analysis

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Figure 7

Calculated temperature at point B for the heating process

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Figure 8

Calculated temperature at point B for the cooling process

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Figure 9

Prediction of the heat transfer coefficient (hi) for the steam testing stage

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Figure 10

Finite element model for coke drum thermal analysis

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Figure 11

Comparison of the calculated and measured temperatures at location 4 (case A)

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Figure 12

Calculated temperature at different locations of the drum for a whole process cycle (case A)

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Figure 13

Temperature difference between the inner and outer surfaces at location 4 (case A)

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Figure 14

Comparison of the calculated and measured temperatures at location 4 (case B)

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Figure 15

Temperature difference between the inner and outer surfaces at location 4 (case B)

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Figure 16

Deformation patterns in the oil filling and water quenching stages

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Figure 17

Axial (vertical) mechanical strain of the coke drum in the thermal cycle

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Figure 18

Hoop mechanical strain of the coke drum in the thermal cycle

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Figure 19

Axial (vertical) stress of the coke drum in the thermal cycle

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Figure 20

Hoop stress of the coke drum in the thermal cycle

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Figure 21

Total von Mises stress of the coke drum in the process cycle

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Figure 22

Total axial strain of the coke drum at the quenching stage

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