Method for operating a fluidized bed boiler
AssigneeImprobed AB
InventorBengt-Ake Andersson
Life of this patent
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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.
Claims15
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.
Dependencies are inferred from the claim text.