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Condensation Characteristic of Sulfuric Acid Vapor on Low-Temperature Surface of Tube Heat Exchanger

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Clean Coal and Sustainable Energy (ISCC 2019)

Part of the book series: Environmental Science and Engineering ((ESE))

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Abstract

In the low-low temperature flue gas system, a part of the H2SO4 vapor is adsorbed by the ash particles, and the other part will condense on the surface of the heat exchanger, resulting in low-temperature corrosion. In this paper, a numerical model for the condensation of H2SO4 vapor on low-temperature surface is constructed. This model combines the thermodynamic phase equilibrium theory, the multicomponent transport theory and the heat transfer theory. The effects of flue gas properties, the size and arrangement of heat exchanger are studied. The results show that, the condensation rate is mainly related to the concentration gradient of H2SO4 vapor near the surface. As the flue gas or surface temperature increases, condensation rate decreases. When the flue gas velocity increases, the mass transfer resistance is reduced, thereby the condensation rate is increased. As the content of H2SO4 in the flue gas increases, the concentration gradient of H2SO4 vapor near the surface increases, and the condensation rate of increases linearly. But the content of water vapor has little effect on the H2SO4 condensation rate. For the tube heat exchanger, when the working conditions keep the same, the smaller the outer diameter of the tube, the greater the condensation rate of the H2SO4 vapor. Compared with the inline arrangement, when the tubes are staggered, the disturbance of flue gas is stronger, and the condensation rate is larger.

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Abbreviations

\(\bar{a}_{i} \overline{a }\) :

Activity coefficients in liquid phases

c p :

Specific heat of the fluid, J kg−1 K−1

Cμ, C2ε:

Constant in the k-ε turbulent current model

D i , m :

Mass diffusivity coefficient, m2 s−1

f i :

Fugacity

f i 0 :

Fugacity under 1 atmosphere, atm−1

G i :

Gibbs free energy

∆\(\Delta \) Giv:

The change in Gibbs free energy during the vaporization of water or sulfuric acid, kJ mol−1

k :

Thermal conductivity of the fluid, W m−2 K−1

K0, K1:

Modified equilibrium constant

\({{\bar{L}}_{i}^{1}} \) :

Partial molar enthalpy, J mol−1

p :

Pressure, Pa

p i :

Partial pressure of sulfuric acid molecule, Pa

p i,0 :

Apparent partial pressure of sulfuric acid, Pa

Sc t :

Turbulent Schmidt number

T :

Temperature of the fluid, K

U :

Fluid velocity, m s−1

y i :

Mass fraction

μ :

Dynamic viscosity, N s m−2

μ t :

Turbulent eddy viscosity

μ i :

Chemical potential

ρ :

Density, kg m−3

σk, σε:

Constant in the k-ε turbulent current model

\(\phi _{{i,0}}\) :

Apparent fugacity coefficient

i :

Species i

g:

Gas

l:

Liquid

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Acknowledgements

This work was supported by the National Key R&D Program of China (2017YFB0602102).

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Authors and Affiliations

  1. State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an , 710049, China

    Ke Sun, Yu Yan, Fangfang Hu, Lei Deng & Defu Che

  2. Huadian Electric Power Research Institute, Hangzhou, 310030, China

    Ke Sun

  3. China Energy Engineering Group Shaanxi Electric Power Design Institute Co., Ltd, Xi’an , 710054, China

    Fangfang Hu

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  1. Ke Sun
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  2. Yu Yan
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  3. Fangfang Hu
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  4. Lei Deng
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  5. Defu Che
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Corresponding author

Correspondence to Defu Che .

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Editors and Affiliations

  1. Department of Energy and Power Engineering, Tsinghua University, Beijing, China

    Junfu Lyu

  2. Department of Energy and Power Engineering, Tsinghua University, Beijing, China

    Shuiqing Li

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Sun, K., Yan, Y., Hu, F., Deng, L., Che, D. (2022). Condensation Characteristic of Sulfuric Acid Vapor on Low-Temperature Surface of Tube Heat Exchanger. In: Lyu, J., Li, S. (eds) Clean Coal and Sustainable Energy. ISCC 2019. Environmental Science and Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-16-1657-0_70

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  • DOI: https://doi.org/10.1007/978-981-16-1657-0_70

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  • Publisher Name: Springer, Singapore

  • Print ISBN: 978-981-16-1656-3

  • Online ISBN: 978-981-16-1657-0

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