Stress Analysis of Gas-Gas Heater in Thermal Power Plant

화력발전용 가스재열기의 응력 해석

  • Hwang, Suk-Hwan (Technology Research Center, Doosan Heavy Industries and Construction Corporation) ;
  • Choi, Jae-Seung (Technology Research Center, Doosan Heavy Industries and Construction Corporation) ;
  • Lee, Hoo-Gwang (Technology Research Center, Doosan Heavy Industries and Construction Corporation)
  • 황석환 (두산중공업(주) 기술연구원) ;
  • 최재승 (두산중공업(주) 기술연구원) ;
  • 이후광 (두산중공업(주) 기술연구원)
  • Published : 2002.01.01

Abstract

Today\`s industrialized plants are required to reduce SOx emitted from stacks at factories, utility power stations, etc. For this purpose, flue gas desulfurization(FGD) system is installed in thermal power plant and gas-gas heater(GGH) is used to play a vital role to reheat the wet treated gas from FGD. The sector plates are located at cold and hot sides of gas-gas heater. They serve as sealing to prevent mixing treated and untreated gases. Therefore, the deformation of the sector plate due to its dead weight and gas pressure should be considered as major factor for the sector plate design. And finite element analysis(FEA) for rotor part in GGH is performed with original model and two weight-reduced models with different diaphragm thickness, respectively. Stress concentrations at rotor diaphragm happen due to the dead weight, pressure difference between treated and untreated gas, and thermal distribution in the rotor. As the thickness of diaphragm is decreased, the stress level is increased. The direction of treated gas and untreated gas flow may affect the stress level.

Keywords

References

  1. 'Ljungstrom Gas Gas Heater(GGH) for Flue Gas Desulfurization System(FGD),' Technical Note, HANJUNG
  2. 정재헌, 함병훈, 이후광, 김중삼, '화력발전소 공기예열기의 피로손상 해석,' 대한기계학회 추계학술대회 논문집, pp. 955-959, 1998
  3. 황석환, 이후광, 최재승, '화력발전용 가스재열기 Sector Plate의 유한요소 해석,' 대한기계학회 춘계학술대회 논문집 A pp. 860-864, 2001
  4. 'Strength Calculation Methods and Formulas for Major Structural Components of GGH,' Technical Note, ABB-KK, 1997
  5. 日本機械學會篇, '傳熱工學資料,' 改訂 第 3 版 1975
  6. 이후광, 황석환, 최재승, '가스재열기 로터 부위의 응력 해석,' 한국정밀공학회 춘계학술대회 논문집, pp. 639-642, 2001
  7. Incropera, F. P. and Dewitt, D. P., 'Introduction to Heat Transfer,' 2nd ed., John Wiley & Sons, 1990
  8. Holman, J.P., 'Heat Transfer,' 5th ed., McGraw-Hill, 1981
  9. HANJUNG R&D Center Material Database, 1998
  10. Shigley, J. E. and Mischke, C. R., 'Mechanical Engineering Design,' 5th ed., McGraw-Hill Inc., 1989