Bed material for bubbling fluidised bed combustion
OwnerBengt-Ake Andersson, Fredrik Lind +1inventors
InventorsBengt-Ake Andersson, Fredrik Lind, Henrik Thunman
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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 <dp> 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.
Claims15
A method, comprising:
- i) providing an amount of ilmenite particles with an average particle size between 0.1 mm and 1.8 mm as bed material in a furnace with a bubbling fluidized bed boiler, wherein the amount of ilmenite particles as a proportion of total bed mass is at least 20% by weight, and
- ii) operating the bubbling fluidized bed boiler for combustion of biomass fuel or waste-based fuel with an excess air ratio λ, below 1.3, wherein in a single bubbling fluidized bed boiler operated under continuous conditions, the ilmenite particles exhibit a reducing-oxidizing effect utilized during the combustion.
A method for operating a bubbling fluidized bed boiler, comprising:
- a) carrying out a biomass fuel or waste-based fuel combustion process in a furnace with a bubbling fluidized bed comprising ilmenite particles having an average particle size between 0.1 mm and 1.8 mm wherein the amount of ilmenite particles as a proportion of total bed mass is at least 20% by weight, wherein in a single bubbling fluidized bed boiler operated under continuous conditions, the ilmenite particles exhibit a reducing-oxidizing effect utilized during the combustion process;
- and
- b) setting an excess air ratio λ, in the furnace to a value below 1.3.
Dependencies are inferred from the claim text.