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    Flow baffles for shell and tube heat exchangers
    1.
    发明授权
    Flow baffles for shell and tube heat exchangers 有权

    公开(公告)号：US11512902B2

    公开(公告)日：2022-11-29

    申请号：US16381728

    申请日：2019-04-11

    Applicant: HOLTEC INTERNATIONAL

    Inventor： Krishna P. Singh ,  Joseph Rajkumar

    IPC: F28D7/08 ,  F28F1/04 ,  F16L9/00 ,  F28D7/16 ,  F28F9/22 ,  F22D1/32 ,  F28D21/00 ,  F22B19/00 ,  F28F9/16 ,  F28D7/00 ,  F28F9/02

    Abstract: An axial flow baffle for a shell and tube heat exchanger includes a substantially planar body configured for transverse arrangement in a longitudinally elongated shell of the shell and tube heat exchanger, a plurality of axial flow tube apertures each comprising a central tube hole configured to receive a tube of the heat exchanger, and an array of peripheral primary flow holes circumferentially spaced apart around the tube hole. The primary flow holes each interrupt the central tube hole and formed a radially inward projecting tube support protrusions between the primary flow holes which engage a single tube. Each primary flow hole has a non-polygonal configuration, which may be semicircular in some embodiments. The primary flow holes create axial flow around the periphery of the tubes through the baffles. In another aspect, a hybrid cross-flow baffle includes a combination of axial flow tube apertures and circular tube support holes.

    FLOW BAFFLES FOR SHELL AND TUBE HEAT EXCHANGERS
    2.
    发明申请
    FLOW BAFFLES FOR SHELL AND TUBE HEAT EXCHANGERS 审中-公开

    公开(公告)号：US20190234689A1

    公开(公告)日：2019-08-01

    申请号：US16381728

    申请日：2019-04-11

    Applicant: HOLTEC INTERNATIONAL

    Inventor： Krishna P. Singh ,  Joseph Rajkumar

    IPC: F28D7/08 ,  F28D7/16 ,  F16L9/00 ,  F28F1/04

    CPC classification number: F28D7/08 ,  F16L9/003 ,  F28D7/1638 ,  F28F1/04

    Abstract: An axial flow baffle for a shell and tube heat exchanger includes a substantially planar body configured for transverse arrangement in a longitudinally elongated shell of the shell and tube heat exchanger, a plurality of axial flow tube apertures each comprising a central tube hole configured to receive a tube of the heat exchanger, and an array of peripheral primary flow holes circumferentially spaced apart around the tube hole. The primary flow holes each interrupt the central tube hole and formed a radially inward projecting tube support protrusions between the primary flow holes which engage a single tube. Each primary flow hole has a non-polygonal configuration, which may be semicircular in some embodiments. The primary flow holes create axial flow around the periphery of the tubes through the baffles. In another aspect, a hybrid cross-flow baffle includes a combination of axial flow tube apertures and circular tube support holes.

    Wet storage facility for nuclear fuel
    5.
    发明授权
    Wet storage facility for nuclear fuel 有权

    公开(公告)号：US10311987B2

    公开(公告)日：2019-06-04

    申请号：US14817885

    申请日：2015-08-04

    Applicant: Holtec International

    Inventor： Krishna P. Singh ,  Joseph Rajkumar

    IPC: G21C19/07 ,  G21C19/32 ,  G21C19/08 ,  G21F7/00 ,  G21F7/005

    Abstract: An autonomous facility for storing spent nuclear fuel includes a building forming an enclosed interior space containing a water-filled spent fuel pool. The pool includes fuel racks containing spent fuel assemblies which heat the water via radioactive decay. A passive cooling system includes a submerged heat exchanger in the pool and an air cooled heat exchanger located in ambient air outside the building at a higher elevation than the pool heat exchanger. A heat transfer working fluid circulates in a closed flow loop between the heat exchangers via unpumped natural gravity driven flow to cool the fuel pool. The air cooled heat exchanger may be enclosed in a concrete reinforced silo adjoining the building for impact protection. The building may include a cask pit formed integrally with the pool to allow fuel assembles to be removed from a transport cask and loaded into the fuel rack underwater.

    Air-cooled heat exchanger and system and method of using the same to remove waste thermal energy from radioactive materials
    6.
    发明授权
    Air-cooled heat exchanger and system and method of using the same to remove waste thermal energy from radioactive materials 有权

    公开(公告)号：US10854344B2

    公开(公告)日：2020-12-01

    申请号：US15722120

    申请日：2017-10-02

    Applicant: Holtec International

    Inventor： Krishna P. Singh ,  Joseph Rajkumar

    IPC: G21C15/22 ,  G21C15/18 ,  G21D3/04

    Abstract: A system for removing thermal energy generated by radioactive materials comprising: an air-cooled shell-and-tube heat exchanger comprising a shell and plurality of heat exchange tubes arranged in a substantially vertical orientation within the shell, the plurality of heat exchange tubes comprising interior cavities that collectively form a tube-side fluid path, the shell forming a shell-side fluid path that extends from an air inlet of the shell to an air outlet of the shell, the first air inlet located at a lower elevation than the air outlet; a heat rejection closed-loop fluid circuit comprising the tube-side fluid path of the air-cooled heat exchanger, a coolant fluid flowing through the heat rejection closed-loop fluid circuit, the heat rejection closed-loop fluid circuit thermally coupled to the radioactive materials so that thermal energy generated by the radioactive materials is transferred to the coolant fluid; and the air-cooled shell-and-tube heat exchanger transferring thermal energy from the coolant fluid flowing through the tube-side fluid path to air flowing through the shell-side fluid path.

    Steam generator for nuclear steam supply system
    8.
    发明授权
    Steam generator for nuclear steam supply system 有权

    公开(公告)号：US10395783B2

    公开(公告)日：2019-08-27

    申请号：US14910433

    申请日：2014-10-24

    Applicant: Holtec International

    Inventor： Krishna P. Singh ,  Joseph Rajkumar

    IPC: G21C15/14 ,  G21C13/04 ,  G21C15/26 ,  G21D1/00 ,  G21C15/257 ,  F22B1/02 ,  G21C15/22 ,  G21C13/032 ,  G21C15/18

    Abstract: A nuclear steam supply system utilizing gravity-driven natural circulation for primary coolant flow through a fluidly interconnected reactor vessel and a steam generating vessel. In one embodiment, the steam generating vessel includes a plurality of vertically stacked heat exchangers operable to convert a secondary coolant from a saturated liquid to superheated steam by utilizing heat gained by the primary coolant from a nuclear fuel core in the reactor vessel. The secondary coolant, may be working fluid associated with a Rankine power cycle turbine-generator set in some embodiments. The steam generating vessel and reactor vessel may each be comprised of vertically elongated shells, which in one embodiment are arranged in lateral adjacent relationship. In one embodiment, the reactor vessel and steam generating vessel are physically discrete self-supporting structures which may be physically located in the same containment vessel.

    AIR-COOLED HEAT EXCHANGER AND SYSTEM AND METHOD OF USING THE SAME TO REMOVE WASTE THERMAL ENERGY FROM RADIOACTIVE MATERIALS
    10.
    发明申请
    AIR-COOLED HEAT EXCHANGER AND SYSTEM AND METHOD OF USING THE SAME TO REMOVE WASTE THERMAL ENERGY FROM RADIOACTIVE MATERIALS 审中-公开

    公开(公告)号：US20180040386A1

    公开(公告)日：2018-02-08

    申请号：US15722120

    申请日：2017-10-02

    Applicant: Holtec International

    Inventor： Krishna P. Singh ,  Joseph Rajkumar

    IPC: G21C15/22 ,  G21C15/18 ,  G21D3/04

    CPC classification number: G21C15/22 ,  G21C15/18 ,  G21D3/04 ,  Y02E30/40

    Abstract: A system for removing thermal energy generated by radioactive materials comprising: an air-cooled shell-and-tube heat exchanger comprising a shell and plurality of heat exchange tubes arranged in a substantially vertical orientation within the shell, the plurality of heat exchange tubes comprising interior cavities that collectively form a tube-side fluid path, the shell forming a shell-side fluid path that extends from an air inlet of the shell to an air outlet of the shell, the first air inlet located at a lower elevation than the air outlet; a heat rejection closed-loop fluid circuit comprising the tube-side fluid path of the air-cooled heat exchanger, a coolant fluid flowing through the heat rejection closed-loop fluid circuit, the heat rejection closed-loop fluid circuit thermally coupled to the radioactive materials so that thermal energy generated by the radioactive materials is transferred to the coolant fluid; and the air-cooled shell-and-tube heat exchanger transferring thermal energy from the coolant fluid flowing through the tube-side fluid path to air flowing through the shell-side fluid path.

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