Journal of Shandong University(Engineering Science) ›› 2018, Vol. 48 ›› Issue (6): 116-121.doi: 10.6040/j.issn.1672-3961.0.2018.142

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Influence of internal pressure on the safety of exhaust duct under multiple loads

Longlin WANG1(),Xundong HU1,Jinsheng QI1,Chunguo AN1,Zhan WANG2,*()   

  1. 1. Shandong Electric Power Engineering Consulting Institute Corporation, Jinan 250013, Shandong, China
    2. School of Energy and Power Engineering, Shandong University, Jinan 250061, Shandong, China
  • Received:2018-04-09 Online:2018-12-20 Published:2018-12-26
  • Contact: Zhan WANG E-mail:wanglonglin@sdepci.com;wangzhan@sdu.edu.cn

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Abstract:

To study the stiffener design discipline of large scale circular exhaust duct, finite element method was used to analyze the impacts on the strength, flexibility and buckling security from internal pressure load under different ash thickness, different number and specification stiffeners. The results indicated that the main stress on the circular duct lied on the contact zone of duct and support, the self-weight was the main factor of stress. For the large diameter duct, the stress under negative press was much higher than the condition of zero pressure and positive pressure. And for the large diameter duct, the stress may rapidly increase while the negative pressure rising, and the large diameter should not be used on negative duct. The ash thickness had smaller impact on the stress of duct, the buckling may less happen while the duct was thicker. The buckling factor of non-dusty condition should be checked on the design of considering dusty thickness.

Key words: power station, exhaust duct, stiffener, multi-loads, finite element method

CLC Number: 

  • TK08

Fig.1

Sketch of gas and air duct"

Fig.2

Mesh validation"

Fig.3

Stress distribution profile"

Fig.4

Impacts on stress from internal pressure"

Fig.5

Buckling deformation under internal pressure"

Fig.6

Impacts on buckling factor from internal pressure"

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