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US 5,347,936 AGranted
Method and a device for preheating a fluidized bed
AssigneeABB Stal AB
InventorSvante Thorhuus
Life of this patent
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AssigneeABB Stal AB
InventorSvante Thorhuus
Estimating the term…
A method and a device for preheating a particulate fluidized bed which is supplied with air for fluidization of bed material and for combustion of main fuel through gas paths that include fluidization members for injection and distribution of the air over the fluidized bed. The bed material is preheated to the ignition temperature for the main fuel used in the fluidized bed by members arranged in the gas paths for combustion of starting fuel. These members are designed and arranged so that the air is supplied to the fluidized bed along the same path through gas paths and fluidization members upon preheating with starting fuel as upon combustion of main fuel in the fluidized bed. The members for combustion of starting fuel are arranged in the fluidization members and comprise fuel injectors, fuel pipes, ignition members and control members. Around or upstream of the fuel injectors, flow-directing members are arranged to split up the air flow into a turbulent sub-flow adjacent to the fuel injectors and a main flow which is conducted past the members with minimum pressure loss.
An apparatus for supplying air to a fluidized bed and for preheating the fluidized bed prior to the supply thereto of a main fuel, said apparatus comprising
A power plant which includes means for a fluidized bed and an apparatus for supplying air to the fluidized bed and for preheating the fluidized bed prior to the supply thereto of a main fuel, said bed preheater comprising
A method of preheating a fluidized bed prior to the supply thereto of a main fuel, said fluidized bed being supplied with air through a plurality of fluidization members positioned in a gas path means, said air fluidizing said bed and enabling combustion of a main fuel supplied thereto, said method comprising the steps of:
Dependencies are inferred from the claim text.