Improbed Ab

Other

E.on Energiinfrastruktur Ab

Bengt-Ake Andersson

Fredrik Lind

Henrik Thunman

Pavleta Knutsson

Mikael Israelsson

Lars Bierlein

Viktor Stenberg

Patrick Moldenhauer

The invention relates to a device for continuously sorting a particulate stream, comprising: a) a conveyor () for conveying the particulate stream to a separation device, b) a sieve () for separating the particulate stream according to size, characterized in that it further comprises c) a per-sieve () comprising elongated sieve openings located between the convey or outlet and the sieve d) and a mechanical impact device for providing mechanical impacts to the pre-sieve (). The pre-sieve allows to separate elongated objects like threads or wires form the particulate stream which would otherwise clog or block subsequent separation devices including the sieve.

Device and method for sorting a particulate stream

The invention relates to a method for operating a fluidized bed boiler (), 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 (); 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 () 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.

Method for operating a fluidized bed boiler

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.

Use of pre-oxidized ilmenite in fluidized bed boilers

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.

Bed management cycle for a fluidized bed boiler and corresponding arrangement

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 () comprising a mesh size from 200 to 1,000 &#x3bc;m designed to separate a coarse and a fine particle size fraction, c. a magnetic separator () 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.

System and process for recycling fluidized boiler bed material

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.

Control method for the operation of a combustion boiler

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.

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 &#x3c;dp&#x3e; between 0.1 mm and 1.8 mm as bed material for a bubbling fluidized bed (BFB) boiler with an excess air ratio (&#x3bb;) 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 claimsand-; and setting the excess air ratio (&#x3bb;) to a value below 1.3.

Bed material for bubbling fluidised bed combustion

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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Molnlycke, Sweden

Bengt-Ake Andersson