Distribution of pH values in a model simulating the secondary side of a steam generator

Faliang XIAO; Tingting ZHONG; Weiling FU; Xiaoyan KANG; Shuiquan DENG

doi:10.11889/j.0253-3219.2022.hjs.45.110602

NUCLEAR TECHNIQUES, Volume. 45, Issue 11, 110602(2022)

Distribution of pH values in a model simulating the secondary side of a steam generator

Faliang XIAO^1,2, Tingting ZHONG^1,2, Weiling FU^2,3, Xiaoyan KANG^1,2, and Shuiquan DENG^2,4、*

Author Affiliations

¹College of Chemistry, Fuzhou University, Fuzhou 350108, China

²State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China

³College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007, China

⁴Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou 350108, China

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Figures & Tables(12)

Fig. 1. Diagram of straight pipe model, the area enclosed by the thick solid line is the cross section of the model (the grey part denotes the water in the secondary circuit, the blue part denotes the tube support plate) (color online)

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Fig. 2. Calculated distribution of the fluid velocities in the secondary circuit model(a) Average velocity over cross sections at various heights, (b) Velocity distributions on three selected cross sections at z = 1.5 m, 2.0 m, 2.5 m, respectively, (c) Velocity distribution on the longitudinal section nearby a support plate at z = 2.0 m, see the dashed line of (b) for the location of the section

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Fig. 3. Variation curve of average temperatures of water on different sections along the flow direction in the secondary side model

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$Variation curve of the average volume fraction of gas along the flow direction on cross sections at different heights of the secondary circuit model, where the black squares indicate the locations of tube support plates$

Fig. 4. Variation curve of the average volume fraction of gas along the flow direction on cross sections at different heights of the secondary circuit model, where the black squares indicate the locations of tube support plates

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Fig. 5. Variation curve of the pH values of the water near the heat transfer tube wall along the axis of the secondary circuit model, where the sampling point coordinates are (12.525 mm, 0, z), 0≤z≤3.8 m (see the cross section of (b)). The various molar ratios of the binary alkalizers are also shown in the inset of the figure. (color online)(a) $c_{N H_{3}}$ = 8.784 mol·m^-3, (b) $c_{N H_{3}}$ + c_ETA = 4.56 mol·m^-3, (c) $c_{N H_{3}}$ + c_ETA = 1.8 mol·m^-3

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Fig. 6. Relation curves of pH value with ETA concentration (c_ETA) change and change rate corresponding to two different alkalizer concentrations (1.8 mol·m^-3, 4.56 mol·m^-3) at z=1.5 m, 2.0 m two points respectively (shown in Fig.5)

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Table 1. Physical parameters of relevant materials
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Table 1. Physical parameters of relevant materials
材料
Material
导热系数
Thermal conductivity / W·(m·K)^-1
恒压热容Heat capacity at constant
pressure / J·(kg·K)^-1
密度
Density / kg·cm^-3
Inconel690 17 524 8 091
304SS 19 505 7 746

Table 2. The dissociation constant and relative volatility of NH₃ and ETA at different temperatures
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Table 2. The dissociation constant and relative volatility of NH₃ and ETA at different temperatures
解离常数Dissociation constant 相对挥发度Relative volatility
温度Temperature / K 298.15 425.15 573.15 298.15 425.15 573.15
氨NH₃ 4.75 5.10 6.67 30 9.55 3.31
乙醇胺ETA 4.5 4.82 6.20 0.01 0.09 0.33

Table 3. The calculated concentrations of NH₃ and ETA in the secondary circuit model with c₁+c₂ = 4.56 mol·m^-³^①

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Table 3. The calculated concentrations of NH₃ and ETA in the secondary circuit model with c₁+c₂ = 4.56 mol·m^-³^①

NH₃:ETA浓度的预设配比

The assumed concentration ratio (NH₃ :ETA)

8∶1

1∶0

4∶1

2∶1

1∶1

1∶2

1∶4

1∶8

二回路中NH₃浓度

The assumed concentrations of NH₃, c₁ / mol·m^-3

4.05

4.56

3.65

3.04

2.28

1.52

0.91

0.51

二回路中ETA浓度

The assumed concentrations of ETA, c₂ / mol·m^-3

0.51

0.91

1.52

2.28

3.04

3.65

4.05

Table 4. The calculated concentrations of NH₃ and ETA in the secondary circuit model with c₁+c₂ = 1.8 mol·m^-³

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Table 4. The calculated concentrations of NH₃ and ETA in the secondary circuit model with c₁+c₂ = 1.8 mol·m^-³

NH₃:ETA浓度的预设配比

The assumed concentration ratio (NH₃ :ETA)

1∶1

1∶0

8∶1

4∶1

2∶1

1∶2

1∶4

1∶8

二回路中NH₃浓度

The assumed concentrations of NH₃, c₁ / mol·m^-3

0.9

1.8

1.6

1.44

1.2

0.6

0.36

0.2

二回路中ETA浓度

The assumed concentrations of ETA, c₂ / mol·m^-3

0.9

0.2

0.36

0.6

1.2

1.44

1.6

Table 5. Thermodynamic parameters of water in its gas and liquid states

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Table 5. Thermodynamic parameters of water in its gas and liquid states

热力学参数Thermodynamic parameters	液相Liquid	汽相Gas
密度Density / kg·m^-3	740.25	—
比热容Specific heat capacity / J·(g·K)^-1	5.396 2	1.990 6
液相动力黏度Dynamic viscosity, liquid phase / Pa·s	9.138×10^-5	—
导热系数Thermal conductivity / W·(m·K)^-1	0.569 1	0.048 7

Table 6. The boundary values of main parameters

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Table 6. The boundary values of main parameters

边界 Boundary	类型 Type	数值 Value
入口(z=0 m) Inlet	水流速度 / m·s^-1 水流温度 / K	1.0 543.15
出口(z=3.8 m) Outlet	水流压强 / MPa	6.81
传热管壁Heat transfer tube wall	热通量 / W·m^-2	170 000~10 000z (0<z≤3.0)
传热管壁Heat transfer tube wall	热通量 / W·m^-2	170 000~30 000z (3<z≤3.8)

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Faliang XIAO, Tingting ZHONG, Weiling FU, Xiaoyan KANG, Shuiquan DENG. Distribution of pH values in a model simulating the secondary side of a steam generator[J]. NUCLEAR TECHNIQUES, 2022, 45(11): 110602

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Paper Information

Category: Research Articles

Received: Jul. 25, 2022

Accepted: --

Published Online: Nov. 25, 2022

The Author Email: DENG Shuiquan (sdeng@fjirsm.ac.cn)

DOI:10.11889/j.0253-3219.2022.hjs.45.110602

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Physical parameters of relevant materials

Table 1. Physical parameters of relevant materials

Table 2. The dissociation constant and relative volatility of NH3 and ETA at different temperatures

Table 2. The dissociation constant and relative volatility of NH3 and ETA at different temperatures

Table 3. The calculated concentrations of NH3 and ETA in the secondary circuit model with c1+c2 = 4.56 mol·m-3 ①

Table 3. The calculated concentrations of NH3 and ETA in the secondary circuit model with c1+c2 = 4.56 mol·m-3 ①

Table 4. The calculated concentrations of NH3 and ETA in the secondary circuit model with c1+c2 = 1.8 mol·m-3

Table 4. The calculated concentrations of NH3 and ETA in the secondary circuit model with c1+c2 = 1.8 mol·m-3

Table 5. Thermodynamic parameters of water in its gas and liquid states

Table 5. Thermodynamic parameters of water in its gas and liquid states

Table 6. The boundary values of main parameters

Table 6. The boundary values of main parameters

Table 2. The dissociation constant and relative volatility of NH₃ and ETA at different temperatures

Table 2. The dissociation constant and relative volatility of NH₃ and ETA at different temperatures

Table 3. The calculated concentrations of NH₃ and ETA in the secondary circuit model with c₁+c₂ = 4.56 mol·m^-³^①

Table 3. The calculated concentrations of NH₃ and ETA in the secondary circuit model with c₁+c₂ = 4.56 mol·m^-³^①

Table 4. The calculated concentrations of NH₃ and ETA in the secondary circuit model with c₁+c₂ = 1.8 mol·m^-³

Table 4. The calculated concentrations of NH₃ and ETA in the secondary circuit model with c₁+c₂ = 1.8 mol·m^-³