Asymmetry Analysis of Water Level Measured on Two Ends of Drum Boiler

Abstract:

Control of the water level in the drum of the boiler system is a critical operation consideration, because asymmetric dynamics of water level measured leads to measuring errors. This phenomenon is testified by field data from a 400t/h drum boiler with natural circulation in a power plant of China. Some equations are developed and several related factors are focused on, and two of which become critical ones accounting for asymmetry of measured value. With the study of structure of distribution pipes in drum, it is found that feed-water flows distributed on the opposite ends of drum are obviously asymmetric, where measurement systems are positioned. When more feed-water is supplied at one end of drum, the rate of steam in water and water temperature become lower, and measured level get higher. Through the simulation, the important factors for asymmetric of water level are found out, which is necessary to minimize the measuring errosrs.

• Periodical: Advanced Materials Research (Volumes 148-149)
• Pages: 1421-1426
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.148-149.1421
• Online since: October 2010
• Authors: Bo Zhou, Chao Yang Fei
• Keywords: Asymmetry, Distribution Effect, Distribution Pipe, Drum Boiler, Drum Level

References

[1] Parry, A., Petetrot, J. F., & Vivier, M. J. Recent progresses in drum level control in french power plants. In Proceedings of International Conference on boiler dynamics and control in nuclear power stations. British Nuclear Energy Society. (1995).

[2] Liu, Fu-guo, Mu Chun-hua, Tan Zhe-ling, An investigation of the deviation in water level indication at the two ends of the boiler drum of a large-sized boiler, Reneng Dongli Gongcheng, No. 16 (2001): pp.399-402（In Chinese）.

[4] Alix, David A. Density error and its correction in boiler drum level indication, In ISA TECH/EXPO Technology Update Conference Proceedings. No. 50(1995): pp.765-779.

[5] Biryukov, V.P.; Biryukov, P.N. Determination of water level in drum of high pressure boiler, In Energetik, No. 6(2004): pp.32-35.

[6] Sasser, Robert (Temple-Inland Forest Products Corp), Texas mill monitors boiler water level using multi-system approach, In Pulp & Paper, No. 64(1990) : pp.88-89.