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Research Papers

Positive Flow Response Characteristic in Vertical Tube Furnace of Supercritical Once-Through Boiler

[+] Author and Article Information
Huan Wang

State Key Laboratory of Multiphase
Flow in Power Engineering,
School of Energy and Power Engineering,
Xi'ran Jiaotong University,
Xi'an, Shaanxi 710049, China

Defu Che

State Key Laboratory of Multiphase
Flow in Power Engineering,
School of Energy and Power Engineering,
Xi'an Jiaotong University,
Xi'an, Shaanxi 710049, China
e-mail: dfche@mail.xjtu.edu.cn

2BMCR: boiler maximum continuous rating.

3BRL: boiler rated load.

4THA: turbine heat acceptance.

1Corresponding author.

Manuscript received June 28, 2013; final manuscript received October 20, 2013; published online January 31, 2014. Assoc. Editor: Jovica R. Riznic.

J. Thermal Sci. Eng. Appl 6(3), 031002 (Jan 31, 2014) (13 pages) Paper No: TSEA-13-1104; doi: 10.1115/1.4025945 History: Received June 28, 2013; Revised October 20, 2013

Positive flow response characteristic in vertical tube furnace of supercritical once-through boiler provides a feasible and effective way to alleviate the thermal maldistribution to some extent. In the present paper, theoretical derivation and simulations were performed to investigate the mechanism and forming conditions of positive flow response characteristic systematically. Two types of transition criterions were built up to judge positive or negative flow response characteristic. Parametric study was carried out to analyze the influencing factors. Both the operating conditions (mass flux, pressure, temperature or quality, heat flux) and the geometric parameters (inside diameter, length, pitch and type of tube) were investigated. In addition, thermal-hydraulic simulation of a 600 MW supercritical W-flame boiler has been carried out to take all these factors into account simultaneously. The conclusions drawn from this study will be of help to the design of large capacity supercritical once-through boilers as well as the refurbishment of existing supercritical or subcritical boilers.

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Figures

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Fig. 1

Once-through boiler furnace arrangements

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Fig. 2

Positive versus negative flow response characteristic (a) positive flow response characteristic, and (b) negative flow response characteristic

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Fig. 3

Schematic diagram of averaged condition tube and malfunctioning tube (a) averaged condition tube, and (b) malfunctioning tube

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Fig. 4

Verification of the proposed judgment method for flow response characteristics (pin = 30 MPa, Tin = 325 °C, (ρw)0 = 1200 kg/(m2s), q = 130 kW/m2, d = 17.63 mm, l = 31.5 m, and s = 44.5 mm); (a) variation of pressure drop against heat absorption deviation at constant mass flux, (b) flow maldistribution due to thermal effect under constant pressure drop, and (c) variation of sensitivity coefficient with heat flux maldistribution coefficient

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Fig. 5

Effect of mass flux on flow response characteristic (pin = 30 MPa, Tin = 325 °C, q = 130 kW/m2, d = 17.63 mm, l = 31.5 m, and s = 44.5 mm, (ρw)0 = 500, 800, 1200, 1600, 2000 kg/(m2s))

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Fig. 6

Effect of pressure on flow response characteristic (Tin = 325 °C, (ρw)0 = 1600 kg/(m2s), q = 130 kW/m2, d = 17.63 mm, l = 31.5 m, s = 44.5 mm, and pin = 15, 20, 25, 30 MPa)

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Fig. 7

Effect of temperature on flow response characteristic (pin = 30 MPa, (ρw)0 = 1600 kg/(m2s), q = 130 kW/m2, d = 17.63 mm, l = 31.5 m, s = 44.5 mm, and Tin = 275, 295, 315, 335 °C)

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Fig. 8

Effect of heat flux on flow response characteristic (pin = 30 MPa, Tin = 325 °C, (ρw)0 = 1600 kg/(m2s), d = 17.63 mm, l = 31.5 m, s = 44.5 mm, and q = 50, 100, 150, 200, 250 kW/m2)

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Fig. 9

Effect of tube inside diameter on flow response characteristic (pin = 30 MPa, Tin = 325 °C, (ρw)0 = 1600 kg/(m2s), q = 130 kW/m2, l = 31.5 m, s = 44.5 mm, and d = 11, 15.24, 17.63, 22.8 mm)

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Fig. 10

Effect of tube length on flow response characteristic (pin = 30 MPa, Tin = 325 °C, (ρw)0 = 1600 kg/(m2s), q = 130 kW/m2, d = 17.63 mm, s = 44.5 mm, and l = 15.76, 23.76, 31.5, 42 m)

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Fig. 11

Effect of tube pitch on flow response characteristic (pin = 30 MPa, Tin = 325 °C, (ρw)0 = 1600 kg/(m2s), q = 130 kW/m2, d = 17.63 mm, l = 31.5 m, and s = 44.5, 50.8, 62.5, 76.2 mm)

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Fig. 12

Effect of tube type on flow response characteristic at supercritical pressure (pin = 30 MPa, Tin = 325 °C, (ρw)0 = 1600 kg/(m2s), q = 130 kW/m2, d = 17.63 mm, l = 31.5 m, and s = 44.5 mm)

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Fig. 13

Effect of tube type on flow response characteristic at subcritical pressure (pin = 12 MPa, Tin = 265 °C, (ρw)0 = 500 kg/(m2s), q = 80 kW/m2, d = 17.63 mm, l = 31.5 m, and s = 44.5 mm)

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Fig. 14

Flow response characteristics of the lower water wall tubes in a 600 MW supercritical once through boiler under full and partial load conditions

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