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A split concept for HRSG (heat recovery steam generators) with simultaneous area reduction and performance improvement

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  • Zebian, Hussam
  • Mitsos, Alexander

Abstract

A split concept for boilers and heat recovery steam generators (HRSG), where flue gas recycling is required for controlling the maximal temperature, is proposed for reducing the heat exchange area and/or the recycling power requirements. The concept is demonstrated in the context of an HRSG of a pressurized oxy-coal combustion process, where the hot flue gas entering the HRSG is diluted by recycled flue gas to comply with the temperature constraint. The split concept proposes splitting the hot flue gas prior to dilution, and introducing the splitted fraction, with or without a secondary recycling stream, at an intermediate point in the HRSG. As a result, the split allows for lower recycling power requirements (lower diluent flowrate) and a smaller heat exchange area because the average temperature difference between the hot and cold streams in the heat exchanger is increased. Multi-objective optimization, for area and power requirements, is performed and the Pareto front is constructed. Results include a reduction by 37% without a change in the compensation power requirements, or a decrease in the power requirements by 18% (corresponding to 0.15 percentage points in cycle efficiency increase) while simultaneously reducing the area by 12%.

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  • Zebian, Hussam & Mitsos, Alexander, 2014. "A split concept for HRSG (heat recovery steam generators) with simultaneous area reduction and performance improvement," Energy, Elsevier, vol. 71(C), pages 421-431.
    • Handle: RePEc:eee:energy:v:71:y:2014:i:c:p:421-431
    DOI: 10.1016/j.energy.2014.04.087
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    References listed on IDEAS

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    1. Hong, Jongsup & Chaudhry, Gunaranjan & Brisson, J.G. & Field, Randall & Gazzino, Marco & Ghoniem, Ahmed F., 2009. "Analysis of oxy-fuel combustion power cycle utilizing a pressurized coal combustor," Energy, Elsevier, vol. 34(9), pages 1332-1340.
    2. Hong, Jongsup & Field, Randall & Gazzino, Marco & Ghoniem, Ahmed F., 2010. "Operating pressure dependence of the pressurized oxy-fuel combustion power cycle," Energy, Elsevier, vol. 35(12), pages 5391-5399.
    3. Li, Duan & Yang, Jian-Bo & Biswal, M. P., 1999. "Quantitative parametric connections between methods for generating noninferior solutions in multiobjective optimization," European Journal of Operational Research, Elsevier, vol. 117(1), pages 84-99, August.
    4. Zebian, Hussam & Mitsos, Alexander, 2013. "Pressurized oxy-coal combustion: Ideally flexible to uncertainties," Energy, Elsevier, vol. 57(C), pages 513-526.
    5. Zebian, Hussam & Rossi, Nicola & Gazzino, Marco & Cumbo, Danila & Mitsos, Alexander, 2013. "Optimal design and operation of pressurized oxy-coal combustion with a direct contact separation column," Energy, Elsevier, vol. 49(C), pages 268-278.
    6. Zebian, Hussam & Gazzino, Marco & Mitsos, Alexander, 2012. "Multi-variable optimization of pressurized oxy-coal combustion," Energy, Elsevier, vol. 38(1), pages 37-57.
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    Cited by:

    1. Dabwan, Yousef N. & Zhang, Liang & Pei, Gang, 2023. "A novel inlet air cooling system to improve the performance of intercooled gas turbine combined cycle power plants in hot regions," Energy, Elsevier, vol. 283(C).

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