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Research Papers: Design and Analysis

Global and Local Elastic-Plastic Stress Analysis of Coke Drum Under Thermal-Mechanical Loadings

[+] Author and Article Information
Feng Ju, John Aumuller

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

Zihui Xia1

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

Pierre Du Plessis

 Suncor Energy Services Inc., 855 Memorial Drive, Fort McMurray, AB T9H 0A8, Canada

1

Corresponding author.

J. Pressure Vessel Technol 133(6), 061202 (Oct 03, 2011) (10 pages) doi:10.1115/1.4002802 History: Received April 13, 2010; Revised October 12, 2010; Published October 03, 2011; Online October 03, 2011

Coke drums are critical equipment in the petroleum industry. The failure modes of coke drums include excessive bulging deformation and fatigue cracking. The elastic-plastic behavior of a coke drum, subjected to both thermal and mechanical loadings, is analyzed for a complete cycle of operation. The effects of multiple operational cycles and localized hot/cold spots are also investigated. It is found that yielding of the clad layer starts at the very early stage in an operating cycle and permanent deformation is caused in the first operating cycle. Plastic shakedown occurs in the clad layer under combined operating thermal and mechanical loadings. It is also found that both hot and cold spots will cause bulging of the shell and the cold spot can cause more severe deformation than the hot spot.

Copyright © 2011 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

Calculated temperature history at different locations of coke drum

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Figure 3

Bilinear stress-strain curves for base and clad materials

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Figure 4

Stress at drum with respect to internal pressure (temperature: 482°C)

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Figure 5

Stresses at location 4 with combined thermal and mechanical loadings: (a) stresses at clad and (b) stresses at base

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Figure 6

Strains at location 4 with combined thermal and mechanical loadings: (a) strains at clad and (b) strains at base

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Figure 7

Equivalent plastic strain at the internal surface (clad) with combined thermal and mechanical loadings

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Figure 8

Radial displacement of coke drum subjected to combined thermal and mechanical loadings

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Figure 9

Radial deformation and temperature profile at the water quenching stage

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Figure 10

One-course model of coke drum shell with boundary conditions

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Figure 11

Simplified temperature and pressure cycles

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Figure 12

Cyclic stress-strain relationship with constant pressure (hoop direction)

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Figure 13

Cyclic stress-strain relationship with in-phase pressure (hoop direction)

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Figure 14

Hot/cold spot model: boundary conditions and mesh details

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Figure 15

Temperature history: (a) cold spot and (b) hot spot

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Figure 16

Residual deformation after (a) cold spot attack and (b) hot spot attack

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Figure 17

Stresses at the edge of the cold spot: (a) clad and (b) base

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Figure 18

Stresses at the edge of the hot spot: (a) clad and (b) base

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Figure 19

Radial ratcheting displacement with (a) repeating cold spot attacks at the same location and (b) repeating hot spot attacks at the same location

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