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Technical Briefs

A New Connection Structure Between Hydrogen Nozzle and Sphere Head in a Hydrofining Reactor

[+] Author and Article Information
Wenchun Jiang1

College of Mechanical and Electronic Engineering, China University of Petroleum, Dongying 257061, PR Chinajiangwenchun@126.com

Z. B. Wang, G. C. Li

College of Mechanical and Electronic Engineering, China University of Petroleum, Dongying 257061, PR China

J. M. Gong

School of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing 210009, PR China

1

Corresponding author.

J. Pressure Vessel Technol 133(1), 014504 (Jan 21, 2011) (6 pages) doi:10.1115/1.4002258 History: Received September 02, 2009; Revised July 11, 2010; Published January 21, 2011; Online January 21, 2011

This paper presents a study of the residual stress in the welding connection between hydrogen nozzle and spherical head in a hydrofining reactor. A sequential coupling finite element program is developed to analyze the residual stress in nozzle-to-sphere connection. The results show that large residual stresses are generated in the weld and weld/parent interface during the welding of hydrogen nozzle. Large axial stress is generated on the internal surface of hydrogen nozzle due to the angular deformation, which has a great effect on hydrogen induced cracking (HIC) and stress corrosion cracking (SCC). Based on the residual stress distribution character, a new connection structure between hydrogen nozzle and head is developed. A stressless flanging is proposed to insert into the nozzle to isolate the residual stresses, which can be useful to prevent HIC and SCC. To cover all the residual stresses effectively, the arc length of flanging should be not less than 80 mm.

Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

T-nozzle to sphere head connection

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Figure 2

Finite element model

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Figure 4

Configuration and measured positions for T-plate joint

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Figure 5

Residual stresses by FEM and X-ray method

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Figure 6

Residual stress contours of radial stress (a), axial stress (b), and hoop stress(c)

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Figure 7

Residual stress along P2 in the weld joint

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Figure 8

Residual stress along P1 and P3

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Figure 9

Residual stress distribution along P5

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Figure 10

Residual stress along P4

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Figure 11

Angular deformation of T-nozzle

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Figure 12

Residual stress distribution along path P6

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Figure 13

The new structure for nozzle-to-head welding

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Figure 14

FE meshing of flange-to-clad welding

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Figure 15

Residual stress contours of radial stress (a), axial stress (b), and hoop stress (c)

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Figure 16

Residual stress distribution along path P7

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