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    Low-Leakage Shaft-End Seals for Utility-Scale Supercritical CO2 Turboexpanders

    Source: Journal of Engineering for Gas Turbines and Power:;2017:;volume( 139 ):;issue: 002::page 22503
    Author:
    Bidkar, Rahul A.
    ,
    Sevincer, Edip
    ,
    Wang, Jifeng
    ,
    Thatte, Azam M.
    ,
    Mann, Andrew
    ,
    Peter, Maxwell
    ,
    Musgrove, Grant
    ,
    Allison, Timothy
    ,
    Moore, Jeffrey
    DOI: 10.1115/1.4034258
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Supercritical carbon dioxide (sCO2) power cycles could be a more efficient alternative to steam Rankine cycles for power generation from coal. Using existing labyrinth seal technology, shaft-end-seal leakage can result in a 0.55–0.65% points efficiency loss for a nominally 500 MWe sCO2 power cycle plant. Low-leakage hydrodynamic face seals are capable of reducing this leakage loss and are considered a key enabling component technology for achieving 50–52% thermodynamic cycle efficiencies with indirect coal-fired sCO2 power cycles. In this paper, a hydrodynamic face seal concept is presented for utility-scale sCO2 turbines. A 3D computational fluid dynamics (CFD) model with real gas CO2 properties is developed for studying the thin-film physics. These CFD results are also compared with the predictions of a Reynolds-equation-based solver. The 3D CFD model results show large viscous shear and the associated windage heating challenge in sCO2 face seals. Following the CFD model, an axisymmetric finite-element analysis (FEA) model is developed for parametric optimization of the face seal cross section with the goal of minimizing the coning of the stationary ring. A preliminary thermal analysis of the seal is also presented. The fluid, structural, and thermal results show that large-diameter (about 24 in.) face seals with small coning (of the order of 0.0005 in.) are possible. The fluid, structural, and thermal results are used to highlight the design challenges in developing face seals for utility-scale sCO2 turbines.
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      Low-Leakage Shaft-End Seals for Utility-Scale Supercritical CO2 Turboexpanders

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4233607
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    contributor authorBidkar, Rahul A.
    contributor authorSevincer, Edip
    contributor authorWang, Jifeng
    contributor authorThatte, Azam M.
    contributor authorMann, Andrew
    contributor authorPeter, Maxwell
    contributor authorMusgrove, Grant
    contributor authorAllison, Timothy
    contributor authorMoore, Jeffrey
    date accessioned2017-11-25T07:15:38Z
    date available2017-11-25T07:15:38Z
    date copyright2016/13/9
    date issued2017
    identifier issn0742-4795
    identifier othergtp_139_02_022503.pdf
    identifier urihttp://138.201.223.254:8080/yetl1/handle/yetl/4233607
    description abstractSupercritical carbon dioxide (sCO2) power cycles could be a more efficient alternative to steam Rankine cycles for power generation from coal. Using existing labyrinth seal technology, shaft-end-seal leakage can result in a 0.55–0.65% points efficiency loss for a nominally 500 MWe sCO2 power cycle plant. Low-leakage hydrodynamic face seals are capable of reducing this leakage loss and are considered a key enabling component technology for achieving 50–52% thermodynamic cycle efficiencies with indirect coal-fired sCO2 power cycles. In this paper, a hydrodynamic face seal concept is presented for utility-scale sCO2 turbines. A 3D computational fluid dynamics (CFD) model with real gas CO2 properties is developed for studying the thin-film physics. These CFD results are also compared with the predictions of a Reynolds-equation-based solver. The 3D CFD model results show large viscous shear and the associated windage heating challenge in sCO2 face seals. Following the CFD model, an axisymmetric finite-element analysis (FEA) model is developed for parametric optimization of the face seal cross section with the goal of minimizing the coning of the stationary ring. A preliminary thermal analysis of the seal is also presented. The fluid, structural, and thermal results show that large-diameter (about 24 in.) face seals with small coning (of the order of 0.0005 in.) are possible. The fluid, structural, and thermal results are used to highlight the design challenges in developing face seals for utility-scale sCO2 turbines.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleLow-Leakage Shaft-End Seals for Utility-Scale Supercritical CO2 Turboexpanders
    typeJournal Paper
    journal volume139
    journal issue2
    journal titleJournal of Engineering for Gas Turbines and Power
    identifier doi10.1115/1.4034258
    journal fristpage22503
    journal lastpage022503-8
    treeJournal of Engineering for Gas Turbines and Power:;2017:;volume( 139 ):;issue: 002
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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