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    USE OF PRE-OXIDIZED ILMENITE IN FLUIDIZED BED BOILERS
    11.
    发明申请
    USE OF PRE-OXIDIZED ILMENITE IN FLUIDIZED BED BOILERS 有权

    公开(公告)号：US20210230714A1

    公开(公告)日：2021-07-29

    申请号：US17181325

    申请日：2021-02-22

    Applicant: Improbed AB

    Inventor： Bengt-Ake Andersson ,  Fredrik Lind ,  Henrik Thunman

    IPC: C22B34/12 ,  F23C10/18

    Abstract: The invention relates to a method for starting up a fluidized bed boiler, such as a circulating fluidized bed (CFB) or a bubbling fluidized bed (BFB) boiler, for operation with a predetermined concentration of ilmenite particles in the bed material. The invention also relates to a method for pre-oxidizing ilmenite, to pre-oxidized ilmenite and to the use of pre-oxidized ilmenite in a fluidized bed boiler.

    BED MANAGEMENT CYCLE FOR A FLUIDIZED BED BOILER AND CORRESPONDING ARRANGEMENT
    13.
    发明申请
    BED MANAGEMENT CYCLE FOR A FLUIDIZED BED BOILER AND CORRESPONDING ARRANGEMENT 审中-公开

    公开(公告)号：US20190072270A1

    公开(公告)日：2019-03-07

    申请号：US15766542

    申请日：2016-11-07

    Applicant: Improbed AB

    Inventor： Bengt-Ake Andersson ,  Pavleta Knutsson ,  Fredrik Lind ,  Henrik Thunman

    IPC: F23C10/26 ,  F23C10/32

    Abstract: The invention relates to abed management cycle for a fluidized bed boiler, comprising the steps of: a) providing fresh ilmenite particles as bed material to the fluidized bed boiler; b) carrying out a fluidized bed combustion process; c) removing at least one ash stream comprising ilmenite particles from the fluidized bed boiler; d) separating ilmenite particles from the at least one ash stream; e) recirculating separated ilmenite particles into the bed of the fluidized bed boiler. The invention also relates to a corresponding arrangement for carrying out fluidized bed combustion, comprising a fluidized bed boiler comprising ilmenite particles as bed material; and a system for removing ash from the fluidized bed boiler; wherein the arrangement further comprises a separator for separating ilmenite particles from the re-moved ash; and means for recirculating separated ilmenite particles into the bed of the fluidized bed boiler.

    System and process for recycling fluidized boiler bed material
    15.
    发明授权
    System and process for recycling fluidized boiler bed material 有权

    公开(公告)号：US11085635B2

    公开(公告)日：2021-08-10

    申请号：US16604911

    申请日：2018-04-10

    Applicant: Improbed AB

    Inventor： Mikael Israelsson ,  Bengt-Ake Andersson ,  Lars Bierlein

    IPC: F23J3/06 ,  F23C10/01 ,  F23C10/26

    Abstract: The invention relates to a system for recycling fluidized bed boiler bed material, comprising: a. a bottom ash removal device for removing bed material from a fluidized bed boiler, b. a mechanical classifier (10) comprising a mesh size from 200 to 1,000 μm designed to separate a coarse and a fine particle size fraction, c. a magnetic separator (12) designed to magnetically classify the fine particle fraction from the mechanical classifier, d. a device for recirculating the magnetic particle fraction into the boiler. The invention allows effective recirculation and reuse of ilmenite bed material.

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