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Article

  • Title

    IMPLEMENTATION OF THE HIERARCHICAL APPROACH IN THE MATHEMATICAL MODELLING OF ONCE-THROUGH STEAM GENERATORS

  • Authors

    Lozhechnikova N.

  • Subject

    ENERGETICS. HEAT ENGINEERING. ELECTRICAL ENGINEERING

  • Year 2020
    Issue 3(62)
    UDC 681.5
    DOI 10.15276/opu.3.62.2020.09
    Pages 70-79
  • Abstract

    A comprehensive system analysis of a once-through steam generator was carried out as well as a multilevel structure of its model was developed. The application of the procedure of decomposition of a complex object at the initial stages of modeling made it possible to single out multidimensional subsystems of directed action. This makes it possible to use advanced computer simulation software. We distinguished the subsystems of the steam generator as a whole, the subsystem of the steam generator, including the screen tubes, separator, mixer, filter, circulation pump, and connecting pipelines in the resulting structural model. The zones of screen tubes determined by the state of the working medium (heating zone with a single-phase medium, evaporation zone I and evaporation zone II with a two-phase medium), finite-dimensional models of screen tube sections of heating and evaporation zones we considered separately. It was found that the models of zero-level subsystems are described by systems of differential and algebraic equations, between the internal variables of which there is no cause-effect relationship. Any subsystem of the first and higher levels can be represented by a subset of subsystems of the immediately lower levels and a set of oriented connections between them. The principle of recurrent explanation was implemented in the problem of simulating a once-through steam generator. The set-theoretic, matrix and graphical methods are used to describe the relationships between subsystems. It is shown that hierarchical models are forms of description, ready for implementation in high-level programming languages. Systematic analysis of processes, technology and design of a once-through steam generator, as well as the proposed research methodology in the time and frequency domains, the calculation methods and simulation methods used, allows you to select the types and classes of mathematical models, forms of their presentation, as well as software.

  • Keywords once-through steam generator, mathematical modeling, hierarchical structure, heat load, combustion chamber, filter, mixer, separator, feed pump
  • Viewed: 16 Dowloaded: 0
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  • References

    Література

    1. Yu-Zh Chena, Yi-Guang Lia, Mike A. Newbyb. Performance simulation of a parallel dual-pressure once-through steam generator. Energy. 2019. Vol. 173 (15), 16–27. DOI: https://doi.org/10.1016/j.energy.2019.02.022.

    2. Simulation of dryout phenomenon and transient heat transfer performance of the once-through steam generator based on heat transfer partition / Zhenyu Shena, Jianxin Shia, Yiran Ganb, Baozhi Suna, Yanjun Li. Annals of Nuclear Energy. 2018. Vol. 115. P. 268–279.

    3. Modeling the full-range thermal-hydraulic characteristics and post-dryout deviation from thermody-namic equilibrium in once-through steam generators / Jianxin Shi, Baozhi Sun, Xiang Yu, Peng Zhang, Fuyuan Song. International Journal of Heat and Mass Transfer. 2017. Vol. 109. P. 266–277. DOI: https://doi.org/10.1016/j.ijheatmasstransfer.2017.02.007.

    4. Fei Qi, Eliyya Shukeir, Ramesh Kadali. Model Predictive Control of Once Through Steam Generator Steam Quality. IFAC-PapersOnLine. 2015. Vol. 48 (8). P. 716–721. DOI: https://doi.org/10.1016/j.ifacol.2015.09.053.

    5. Numerical study on annular tube once-through steam generator using compressible flow model / Z.L. Wang, W.X. Tian, Y.W. Wu, S.Z. Qiu, G.H. Su. Annals of Nuclear Energy. 2012. Vol. 39 (1). P. 49–55.

    6. Xinyu Wei, Shifa Wu, Pengfei Wang, Fuyu Zhao. Study on the Structure Optimization and the Opera-tion Scheme Design of a Double-Tube Once-Through Steam Generator. Nuclear Engineering and Technology. 2016. Vol. 48 (4). P. 1022–1035. DOI: https://doi.org/10.1016/j.net.2016.02.012.

    7. Prediction of dryout and post-dryout wall temperature at different operating parameters for once-through steam generators / Jianxin Shi, Baozhi Sun, Guolei Zhang, Fuyuan Song, Longbin Yang. Inter-national Journal of Heat and Mass Transfer. 2016. Vol. 103. P. 66–76. DOI: https://doi.org/10.1016/j.ijheatmasstransfer.2016.07.027.

    8. Boje E. (2011). Control and Operability of Economiser Bypass in Once-through Steam Generators. IFAC Proceedings Volumes. 2011. Vol. 44 (1). P. 7030–7034. DOI: https://doi.org/10.3182/20110828-6-IT-1002.00905.

    9. Comparative investigation of drum-type and once-through heat recovery steam generator during start-up / Nicolas Mertens, Falah Alobaid, Ralf Starkloff, Bernd Epple, Hyun-Gee Kim. Applied Energy. 2015. Vol. 144. P. 250–260. DOI: https://doi.org/10.1016/j.apenergy.2015.01.065.

    10. Antonio Roviraa, Manuel Valdésb, Ma Dolores Duránc. A model to predict the behavior at part load operation of once-through heat recovery steam generators working with water at supercritical pressure. Applied Thermal Engineering. 2010. Vol. 30 (13). P. 1652–1658.

    References

    1. Yu-Zh Chen, Yi-Guang Li, & Mike A. Newby. (2019). Performance simulation of a parallel dual-pressure once-through steam generator. Energy, 173 (15), 16–27. DOI: https://doi.org/10.1016/j.energy.2019.02.022.

    2. Zhenyu Shena, Jianxin Shia, Yiran Ganb, Baozhi Suna, & Yanjun Li. (2018). Simulation of dryout phe-nomenon and transient heat transfer performance of the once-through steam generator based on heat transfer partition. Annals of Nuclear Energy, 115, 268–279.

    3. Jianxin Shi, Baozhi Sun, Xiang Yu, Peng Zhang, & Fuyuan Song. (2017). Modeling the full-range thermal-hydraulic characteristics and post-dryout deviation from thermodynamic equilibrium in once-through steam generators. International Journal of Heat and Mass Transfer, 109, 266–277. DOI: https://doi.org/10.1016/j.ijheatmasstransfer.2017.02.007.

    4. Fei Qi, Eliyya Shukeir, & Ramesh Kadali. (2015). Model Predictive Control of Once Through Steam Generator Steam Quality. IFAC-PapersOnLine, 48 (8), 716–721. DOI: https://doi.org/10.1016/j.ifacol.2015.09.053.

    5. Wang, Z.L., Tian, W.X., Wu, Y.W., Qiu, S.Z., & Su, G.H. (2012). Numerical study on annular tube once-through steam generator using compressible flow model. Annals of Nuclear Energy, 39 (1), 49–55.

    6. Xinyu Wei, Shifa Wu, Pengfei Wang, & Fuyu Zhao. (2016). Study on the Structure Optimization and the Operation Scheme Design of a Double-Tube Once-Through Steam Generator. Nuclear Engineering and Technology, 48 (4), 1022–1035. DOI: https://doi.org/10.1016/j.net.2016.02.012.

    7. Jianxin Shi, Baozhi Sun, Guolei Zhang, Fuyuan Song, & Longbin Yang. (2016). Prediction of dryout and post-dryout wall temperature at different operating parameters for once-through steam generators. International Journal of Heat and Mass Transfer, 103, 66–76. DOI: https://doi.org/10.1016/j.ijheatmasstransfer.2016.07.027.

    8. Boje, E. (2011). Control and Operability of Economiser Bypass in Once-through Steam Generators. IFAC Proceedings Volumes, 44 (1), 7030–7034. DOI: 10.3182/20110828-6-IT-1002.00905.

    9. Nicolas Mertensa, Falah Alobaida, Ralf Starkloffa, Bernd Epplea, & Hyun-Gee Kimb. (2015). Com-parative investigation of drum-type and once-through heat recovery steam generator during start-up. Ap-plied Energy, 144, 250–260. DOI: https://doi.org/10.1016/j.apenergy.2015.01.065.

    10. Antonio Roviraa, Manuel Valdésb, & Ma Dolores Duránc. (2010). A model to predict the behavior at part load operation of once-through heat recovery steam generators working with water at supercritical pressure. Applied Thermal Engineering, 30 (13), 1652–1658.

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