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Acid Corrosion Analysis in the Initial Condensation Zone of a H 2 O/CO 2 Turbine

Author

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  • Ziyue Ma

    (School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China)

  • Xiaofang Wang

    (School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China)

  • Jinguang Yang

    (School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China)

  • Wei Wang

    (School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China)

  • Wenyang Shao

    (School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China)

  • Xiaowu Jiang

    (Xi’an Shaangu Power Co., Ltd., Xi’an 710075, China)

Abstract

A supercritical H 2 O/CO 2 turbine is a key piece of equipment for the coal gasification in the supercritical water (CGSW) cycle to achieve conversion of heat into power. Compared with a traditional steam turbine, the working medium of an H 2 O/CO 2 turbine has a relatively high CO 2 concentration. In the initial condensation zone (ICZ), steam condenses into droplets on the turbine blades and the droplets combine with CO 2 to form carbonic acid, which corrodes the turbine blades. In order to research the characteristics of acid corrosion in the ICZ of a H 2 O/CO 2 turbine, the acid corrosion rate of the blades in the ICZ of the H 2 O/CO 2 turbine was calculated and analyzed based on the three-dimensional CFD (3D CFD) method and a one-dimensional numerical model of CO 2 corrosion. The results suggest that acid corrosion rates decrease stage by stage in the ICZ due to the reduction in temperature and pressure. Rotor blades in the first stage in the ICZ suffer the worst and form a corrosion zone at the trailing edge of the blade and on the pressure surface. The decline of efficiency caused by corrosion settles down to a relatively steady value of 0.6% for a 10 year service time. Moreover, the corrosion area for the last two stages shrinks with the service time due to the rearward movement of the ICZ.

Suggested Citation

  • Ziyue Ma & Xiaofang Wang & Jinguang Yang & Wei Wang & Wenyang Shao & Xiaowu Jiang, 2021. "Acid Corrosion Analysis in the Initial Condensation Zone of a H 2 O/CO 2 Turbine," Energies, MDPI, vol. 14(11), pages 1-14, June.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:11:p:3323-:d:569495
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    References listed on IDEAS

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    1. Elyas Abdulahi Mohamued & Masood Ahmed & Paula Pypłacz & Katarzyna Liczmańska-Kopcewicz & Muhammad Asif Khan, 2021. "Global Oil Price and Innovation for Sustainability: The Impact of R&D Spending, Oil Price and Oil Price Volatility on GHG Emissions," Energies, MDPI, vol. 14(6), pages 1-18, March.
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    1. Liu, Shanke & Yang, Yan & Yu, Lijun & Cao, Yu & Liu, Xinyi & Yao, Anqi & Cao, Yaping, 2023. "Self-heating optimization of integrated system of supercritical water gasification of biomass for power generation using artificial neural network combined with process simulation," Energy, Elsevier, vol. 272(C).

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