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Design and Analysis

A Modified Weld Structure of Layered Urea Reactor Based on Stress Analysis and Leak Detection

[+] Author and Article Information
Shugen Xu

College of Chemical Engineering,  China University of Petroleum, Qingdao 266555, China; Engineering and Technology Research Center for Special Equipment Safety of Shandong Province, Jinan 250061, Chinaxsg123@163.com

Weiqiang Wang1

School of Mechanical Engineering,  Shandong University, Jinan 250061, Shandong, China; Engineering and Technology Research Center for Special Equipment Safety of Shandong Province, Jinan 250061, Shandong, Chinawqwang@sdu.edu.cn

Mengli Li

School of Mechanical Engineering,  Shandong University, Jinan 250061, Shandong, China; Engineering and Technology Research Center for Special Equipment Safety of Shandong Province, Jinan 250061, Shandong, China490222960@qq.com

1

Corresponding author.

J. Pressure Vessel Technol 134(3), 031203 (May 18, 2012) (6 pages) doi:10.1115/1.4005864 History: Received August 07, 2010; Revised November 20, 2011; Published May 17, 2012; Online May 18, 2012

In this paper, a modified weld structure of the layered urea reactor has been provided. In the modified structure, new circumferential weld can improve the stress status of the urea reactor. It has the both advantage of separated and integrated layered pressure vessel. This modified design is based on the stress status analysis and the requirement of leak detection. In order to evaluate the modified structure, stresses of original and modified urea reactor shell with interlayer gaps were calculated via Finite element software ANSYS 12.0. The calculation result shows that the maximum stress of the modified structure is reduced obviously in the same condition, and the leak of liner also can be detected effectively.

Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Some acceptable welded joints of layered-to-layered and layered-to-solid sections in ASME Code (FIG. ULW-17.6). (a) or (e)—Joint of layered sections to solid sections; (b), (c),(d) (f), or (g)—Joint of layered sections to layered sections; (h) weld joint of strip winding vessel.

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Figure 2

Urea reactor structure

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Figure 3

Circumferential weld structure

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Figure 4

Leakage detection system

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Figure 5

The structure of leak detection tube

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Figure 6

The geometrical model of original structure in ANSYS

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Figure 7

The mesh of weld and adjacent zone

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Figure 8

The real stress–strain curve

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Figure 9

Elastic Mises stress (MPa) contour of original weld zone

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Figure 10

Elastoplastic Mises stress (MPa) contour of original weld zone

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Figure 11

Cracks in the cross-section of the weld

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Figure 12

Crack originated from weld toe of a scrapped urea reactor

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Figure 13

The modified weld structure

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Figure 14

Elastic Mises stress (MPa) contour of modified weld zone

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Figure 15

Partial enlarged view of Fig. 1

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Figure 16

Elastoplastic Mises stress (MPa) contour of modified weld zone

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Figure 17

Partial enlarged view of Fig. 1

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Figure 18

The leak detection system of modified structure

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