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公开(公告)号：US20190203320A1
公开(公告)日：2019-07-04
申请号：US15735429
申请日：2016-06-07
Applicant: Improbed AB
Inventor： Bengt-Ake Andersson , Fredrik Lind , Henrik Thunman
CPC classification number: C22B34/1209 , F23C10/18 , F23C2900/10004
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.
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公开(公告)号：US20180283683A1
公开(公告)日：2018-10-04
申请号：US15766541
申请日：2016-11-07
Applicant: Improbed AB
Inventor： Bengt-Ake Andersson , Pavleta Knutsson , Fredrik Lind , Henrik Thunman
CPC classification number: F23C10/02 , C22B34/1204 , F23C10/00 , F23C10/007 , F23C10/32 , F23C2206/102 , F23C2900/10001
Abstract: The invention relates to a method for operating a fluidized bed boiler, comprising carrying out the combustion process with a fluidized bed comprising ilmenite particles, wherein the average residence time of the ilmenite particles in the boiler is at least 75 hours. The invention further relates to ilmenite particles obtainable by a corresponding method and the use of said ilmenite particles as oxygen-carrying material.
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公开(公告)号：US11060719B2
公开(公告)日：2021-07-13
申请号：US15735436
申请日：2016-06-07
Applicant: Improbed AB
Inventor： Bengt-Ake Andersson , Fredrik Lind , Henrik Thunman
Abstract: The invention is in the field of boiler control and relates to a control method for the operation of a combustion boiler, comprising providing a predetermined upper limit (VF,max) for the flue gas velocity in at least one location of the boiler; monitoring the flue gas velocity (VF) during the combustion of fuel in said at least one location of the boiler; comparing the flue gas velocity (VF) with the predetermined upper limit (VF,max); decreasing the thermal load of the boiler if the flue gas velocity exceeds the predetermined upper limit (VF,max). The invention also relates to a control system configured to execute the control method.
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公开(公告)号：US10927432B2
公开(公告)日：2021-02-23
申请号：US15735429
申请日：2016-06-07
Applicant: Improbed AB
Inventor： Bengt-Ake Andersson , Fredrik Lind , Henrik Thunman
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.
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公开(公告)号：US20180038586A1
公开(公告)日：2018-02-08
申请号：US15537233
申请日：2015-12-17
Applicant: Improbed AB
Inventor： Bengt-Ake Andersson , Fredrik Lind , Henrik Thunman
Abstract: The invention is in the technical field of bubbling fluidized bed combustion and relates to the use of ilmenite particles with an average particle size between 0.1 mm and 1.8 mm as bed material for a bubbling fluidized bed (BFB) boiler with an excess air ratio (λ) below 1.3 and to a method for operating a bubbling fluidized bed (BFB) boiler, comprising carrying out the combustion process with a bubbling fluidized bed comprising ilmenite particles as defined in any one of claims 1 and 4-5; and setting the excess air ratio (λ) to a value below 1.3.
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Patent Agency Ranking
公开(公告)号：US11187406B2
公开(公告)日：2021-11-30
申请号：US15766542
申请日：2016-11-07
Applicant: Improbed AB
Inventor： Bengt-Ake Andersson , Pavleta Knutsson , Fredrik Lind , Henrik Thunman
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.
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公开(公告)号：US20200292169A1
公开(公告)日：2020-09-17
申请号：US16604911
申请日：2018-04-10
Applicant: Improbed AB
Inventor： Mikael Israelsson , Bengt-Ake Andersson , Lars Bierlein
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 fme 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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公开(公告)号：US20200292163A1
公开(公告)日：2020-09-17
申请号：US16604912
申请日：2018-04-18
Applicant: Improbed AB
Inventor： Bengt-Ake Andersson
Abstract: The invention relates to a method for operating a fluidized bed boiler (6), comprising the steps of: a) providing fresh ilmenite particles having a shape factor of 0.8 or lower as bed material to the fluidized bed boiler (6); 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, wherein the separation includes a step of using a magnetic separator (12) comprising a field strength of 2,000 Gauss or more; e) recirculating separated ilmenite particles into the bed of the fluidized bed boiler; wherein the average residence time of ilmenite particles in the fluidized bed is 100 h or more.
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公开(公告)号：US20180180282A1
公开(公告)日：2018-06-28
申请号：US15735436
申请日：2016-06-07
Applicant: Improbed AB
Inventor： Bengt-Ake Andersson , Fredrik Lind , Henrik Thunman
CPC classification number: F23C10/28 , F23C10/22 , F23C2900/10001 , F23N1/022 , F23N3/002 , F23N5/006 , F23N2037/18 , F23N2900/00
Abstract: The invention is in the field of boiler control and relates to a control method for the operation of a combustion boiler, comprising providing a predetermined upper limit (VF,max) for the flue gas velocity in at least one location of the boiler, monitoring the flue gas velocity (VF) during the combustion of fuel in said at least one location of the boiler, comparing the flue gas velocity (VF) with the predetermined upper limit (VF,max); decreasing the thermal load of the boiler if the flue gas velocity exceeds the predetermined upper limit (VF,max). The invention also relates to a control system configured to execute the control method.
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公开(公告)号：US11414725B2
公开(公告)日：2022-08-16
申请号：US17181325
申请日：2021-02-22
Applicant: Improbed AB
Inventor： Bengt-Ake Andersson , Fredrik Lind , Henrik Thunman
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.
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