Patents by Inventor Henrik Thunman
Henrik Thunman has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20240093865Abstract: Various aspects provide for a multistage fluidized bed reactor, particularly comprising a volatilization stage and a combustion stage. The gas phases above the bed solids in the respective stages are separated by a wall. An opening (e.g., in the wall) provides for transport of the bed solids from the volatilization stage to the combustion stage. Active control of the gas pressure in the two stages may be used to control residence time. Various aspects provide for a fuel stream processing system having a pretreatment reactor, a combustion reactor, and optionally a condensation reactor. The condensation reactor receives a volatiles stream volatilized by the volatilization reactor. The combustion reactor receives a char stream resulting from the removal of the volatiles by the volatilization reactor.Type: ApplicationFiled: November 26, 2023Publication date: March 21, 2024Inventors: Christer Gustavsson, David Pallares, Henrik Thunman, Martin Seemann, Henrik Ström
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Patent number: 11859812Abstract: Various aspects provide for a multistage fluidized bed reactor, particularly comprising a volatilization stage and a combustion stage. The gas phases above the bed solids in the respective stages are separated by a wall. An opening (e.g., in the wall) provides for transport of the bed solids from the volatilization stage to the combustion stage. Active control of the gas pressure in the two stages may be used to control residence time. Various aspects provide for a fuel stream processing system having a pretreatment reactor, a combustion reactor, and optionally a condensation reactor. The condensation reactor receives a volatiles stream volatilized by the volatilization reactor. The combustion reactor receives a char stream resulting from the removal of the volatiles by the volatilization reactor.Type: GrantFiled: June 11, 2018Date of Patent: January 2, 2024Assignee: BioShare ABInventors: Henrik Ström, David Pallarès, Henrik Thunman, Martin Seemann, Christer Gustavsson
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Patent number: 11414725Abstract: 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.Type: GrantFiled: February 22, 2021Date of Patent: August 16, 2022Assignee: Improbed ABInventors: Bengt-Ake Andersson, Fredrik Lind, Henrik Thunman
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Patent number: 11187406Abstract: 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.Type: GrantFiled: November 7, 2016Date of Patent: November 30, 2021Assignee: Improbed ABInventors: Bengt-Ake Andersson, Pavleta Knutsson, Fredrik Lind, Henrik Thunman
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Publication number: 20210245130Abstract: Various aspects provide for a fluidized bed reactor comprising a container having a bed of bed solids and a splashgenerator configured to impart a directed momentum to a portion of the bed solids. A bedwall may separate the bed solids into first and second reaction zones, and the directed momentum may be used to transfer bed solids from one zone to the other. A return passage may provide for return of the transferred bed solids, providing for circulation between the zones. A compact circulating bubbling fluidized bed may be integrated with a reactor having first and second stages, each with its own fluidization gas and ambient. A multistage reactor may comprise a gaswall separating at least the gas phases above two different portions of the bed. A gaslock beneath the gaswall may provide reduced gas transport while allowing bed transport, reducing contamination.Type: ApplicationFiled: December 9, 2018Publication date: August 12, 2021Inventors: David Pallarès, Martin Seemann, Henrik Ström, Henrik Thunman, Anton Larsson, Christer Gustavsson
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Publication number: 20210230714Abstract: 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.Type: ApplicationFiled: February 22, 2021Publication date: July 29, 2021Inventors: Bengt-Ake Andersson, Fredrik Lind, Henrik Thunman
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Patent number: 11060719Abstract: 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.Type: GrantFiled: June 7, 2016Date of Patent: July 13, 2021Assignee: Improbed ABInventors: Bengt-Ake Andersson, Fredrik Lind, Henrik Thunman
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Patent number: 11047568Abstract: The invention relates to a method for operating a fluidized bed boiler, comprising: a) setting the ratio of secondary oxygen containing gas to primary oxygen containing fluidizing gas to a value ranging from 0.0 to 0.8; b) carrying out the combustion of fuel with a fluidized bed comprising ilmenite particle; and to a fluidized bed boiler.Type: GrantFiled: June 7, 2016Date of Patent: June 29, 2021Assignee: Improbed ABInventors: Bengt-Ake Andersson, Fredrik Lind, Henrik Thunman
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Publication number: 20210180787Abstract: Aspects provide for volatilizing a biomass-based fuel stream, removing undesirable components from the resulting volatiles stream, and combusting the resulting stream (e.g., in a kiln). Removal of particles, ash, and/or H2O from the volatiles stream improves its economic value and enhances the substitution of legacy (e.g., fossil) fuels with biomass-based fuels. Aspects may be particularly advantageous for upgrading otherwise low-quality biomass to a fuel specification sufficient for industrial implementation. A volatilization reactor may include a fluidized bed reactor, which may comprise multiple stages and/or a splashgenerator. A splashgenerator may impart directed momentum to a portion of the bed to increase bed transport via directed flow.Type: ApplicationFiled: June 7, 2019Publication date: June 17, 2021Inventors: Christer Gustavsson, Anton Larsson, Martin Seemann, Henrik Thunman, David Pallarès, Henrik Ström, Lars Stigsson
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Patent number: 10927432Abstract: 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.Type: GrantFiled: June 7, 2016Date of Patent: February 23, 2021Assignee: IMPROBED ABInventors: Bengt-Ake Andersson, Fredrik Lind, Henrik Thunman
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Patent number: 10871286Abstract: 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 <dp> between 0.1 mm and 1.8 mm as bed material for a bubbling fluidized bed (BFB) boiler with an excess air ratio (?) 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 (?) to a value below 1.3.Type: GrantFiled: December 17, 2015Date of Patent: December 22, 2020Inventors: Bengt-Ake Andersson, Fredrik Lind, Henrik Thunman
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Patent number: 10808924Abstract: 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.Type: GrantFiled: November 7, 2016Date of Patent: October 20, 2020Assignee: Improbed ABInventors: Bengt-Ake Andersson, Pavleta Knutsson, Fredrik Lind, Henrik Thunman
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Publication number: 20200141570Abstract: Various aspects provide for a multistage fluidized bed reactor, particularly comprising a volatilization stage and a combustion stage. The gas phases above the bed solids in the respective stages are separated by a wall. An opening (e.g., in the wall) provides for transport of the bed solids from the volatilization stage to the combustion stage. Active control of the gas pressure in the two stages may be used to control residence time. Various aspects provide for a fuel stream processing system having a pretreatment reactor, a combustion reactor, and optionally a condensation reactor. The condensation reactor receives a volatiles stream volatilized by the volatilization reactor. The combustion reactor receives a char stream resulting from the removal of the volatiles by the volatilization reactor.Type: ApplicationFiled: June 11, 2018Publication date: May 7, 2020Inventors: Henrik Ström, David Pallarès, Henrik Thunman, Martin Seemann, Christer Gustavsson
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Publication number: 20190203320Abstract: 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.Type: ApplicationFiled: June 7, 2016Publication date: July 4, 2019Inventors: Bengt-Ake Andersson, Fredrik Lind, Henrik Thunman
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Publication number: 20190072270Abstract: 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.Type: ApplicationFiled: November 7, 2016Publication date: March 7, 2019Inventors: Bengt-Ake Andersson, Pavleta Knutsson, Fredrik Lind, Henrik Thunman
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Publication number: 20180283683Abstract: 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.Type: ApplicationFiled: November 7, 2016Publication date: October 4, 2018Inventors: Bengt-Ake Andersson, Pavleta Knutsson, Fredrik Lind, Henrik Thunman
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Publication number: 20180180282Abstract: 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.Type: ApplicationFiled: June 7, 2016Publication date: June 28, 2018Inventors: Bengt-Ake Andersson, Fredrik Lind, Henrik Thunman
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Publication number: 20180180281Abstract: The invention relates to a method for operating a fluidized bed boiler, comprising: a) setting the ratio of secondary oxygen containing gas to primary oxygen containing fluidizing gas to a value ranging from 0.0 to 0.8; b) carrying out the combustion of fuel with a fluidized bed comprising ilmenite particle; and to a fluidized bed boiler.Type: ApplicationFiled: June 7, 2016Publication date: June 28, 2018Inventors: Bengt-Ake Andersson, Fredrik Lind, Henrik Thunman
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Publication number: 20180038586Abstract: 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 <dp> between 0.1 mm and 1.8 mm as bed material for a bubbling fluidized bed (BFB) boiler with an excess air ratio (?) 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 (?) to a value below 1.3.Type: ApplicationFiled: December 17, 2015Publication date: February 8, 2018Inventors: Bengt-Ake Andersson, Fredrik Lind, Henrik Thunman