Journal of Zhejiang University SCIENCE A
ISSN 1673-565X(Print), 1862-1775(Online), Monthly

2009   Vol. 10   No. 11   p. 1589~1594

Experimental and thermal stress investigation on side wall deformation at the pendent convective pass in a utility boiler

Li-ping PANG^†, Bao-min SUN, Tong LIU

(MOE, Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, North China Electric Power University, Beijng 102206, China)
^†E-mail: liping_pang@163.com
Received Nov. 3, 2008; revision accepted June 13, 2009; Crosschecked Sept. 9, 2009

Abstract: An experimental investigation is performed on side wall deformation at the pendant convective pass (PCP) in a 300 MW and a 600 MW utility boiler. The temperature distributions are measured on the side wall areas of the water-cooled wall, the PCP and the horizontal convective pass (HCP) in the two utility boilers. These experiments show that there are great temperature differences in the side wall areas during the startup process in both utility boilers. These temperature differences can reach 80~150 (C with the side wall temperature in the PCP area higher than those in the water-cooled wall and the HCP. The highest temperature in the PCP is close to the flue gas side temperature at the same position in the horizontal flue gas pass. Thermal stress analyses are conducted in the side wall areas in the water-cooled wall, the PCP and the HCP with the software ANSYS. The results show that, at great temperature differences, the PCP side wall undergoes negative thermal stresses that exceed the yield strength causing deformation in the PCP side wall.

Key words: Utility boiler, Horizontal flue gas side wall in pendant convective pass (PCP), Deformation, Temperature measurement, Thermal stress analysis
doi:10.1631/jzus.A0820763             CLC number: TK223.2

References:

[1] ANSYS Inc., 2000a. Advanced Analysis Techniques Guide. Canonsburg, PA, p.158-230.

[2] ANSYS Inc., 2000b. Structural Analysis Guide. Canonsburg, PA, p.245-278.

[3] Bao, Y., Lu, H., 1988. Hydraulics and Inside Equipment in Utility Boiler. Harbin Industry University Publishing House, Harbin, p.127-145 (in Chinese).

[4] Huang, C., 1982. Hydraulics and Inside Equipment in Utility Boiler. Harbin Industry University Publishing House, Harbin, p.145-160 (in Chinese).

[5] Li, G., Li, J., Pang, J., 1998. Analysis on leakage of wall superheater of Unit 1 at Dalate power plant. Inner Mongolia Electric Power, 10(1):57-60 (in Chinese).

[6] Liu, T., Xu, G., Pang, L., Liang, Z., 2004. Creep analysis and lifetime calculation on pressured parts in utility boiler. Power Engineering, 24(5):631-635 (in Chinese).

[7] Pan, Z., 2004. Finite Element Analysis and Application. Tsinghua University Publishing House, Beijing, p.205-234 (in Chinese).

[8] Ray, A.K., Sahay, S.K., Goswami, B., 2003. Assessment of service exposure boiler tubes. Engineering Failure Analysis, 10(6):645-654.

[9] Shi, D., Zhang, J., 2000. Analysis on frequent leakage of front side wall superheater of Unit 1 at Huaneng Yueyang power plant. Hunan Electric Power, 20(5):46-47 (in Chinese).

[10] Sun, B.M., Pang, L.P., Liu, T., 2007. Theoretical and Experimental Study on Side Wall Flow Distribution at Pendant Convective Pass (PCP) in RBC Utility Boilers. Technical Report, CE2006-04, North China Electric Power University, China (in Chinese).

[11] Xu, Z., 2005. Elastic Mechanics. Higher Education Publishing House, Beijing, p.112-127 (in Chinese).