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Research Papers

Analysis of the Hydraulic Resistance of a Water Wall Based on a Distributed Parameter Model in a Supercritical Once-Through Boiler

[+] Author and Article Information
Zixue Luo

e-mail: luozixue@mail.hust.edu.cn

Huaichun Zhou

State Key Laboratory of Coal Combustion,
Huazhong University of Science and Technology,
Wuhan, Hubei 430074, China

1Corresponding author.

Manuscript received February 28, 2013; final manuscript received June 13, 2013; published online October 21, 2013. Assoc. Editor: Jovica R. Riznic.

J. Thermal Sci. Eng. Appl 6(1), 011006 (Oct 21, 2013) (7 pages) Paper No: TSEA-13-1050; doi: 10.1115/1.4024875 History: Received February 28, 2013; Revised June 13, 2013

Accurate prediction of the hydraulic resistance is helpful for the safe operation of a water wall in a supercritical boiler. In this paper, the density distribution for the resistance calculation of a water wall at the supercritical pressure is numerically analyzed, and a distributed parameter model of the hydraulic resistance is developed in a down-fired 600 MWe supercritical boiler using a three-dimensional temperature distribution. The results show that the difference in the density along the radial direction is small and that the hydraulic resistance of the water wall tubes at the supercritical pressure is affected by the critical phenomenon of the working fluid and the allocation of heat flux of the boiler. The simulation cases and in situ operation data demonstrate the model. The model provides a new analysis method for the hydraulic resistance characteristics of a water wall in this thermodynamic system, and the derived model builds a foundation for developing flow monitoring and a thermal-hydraulic design.

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Figures

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Fig. 1

Monitoring system for a 3D temperature distribution in a down-fired boiler

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Fig. 2

(a) Density and specific heat of water at the supercritical pressure and (b) schematic diagram of the water wall

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Fig. 3

Comparison of the wall temperature (a), the radial density distribution (b) and the temperature distribution (c) of the working fluid for case 2

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Fig. 4

Pressure drop, frictional resistance and gravity in the water wall along the furnace height: (a) case 1; (b) case 2; and (c) case 3

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Fig. 5

Pressure and density of the working fluid's variance with temperature: (a) case 2 and (b) case 3

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Fig. 6

(a) Fluid pressure and the density along the furnace height and (b) fluid temperature and the heat flux along the furnace height

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