Back to results
US 4,730,563 AGranted
Power plant with centrifugal separators for returning material from combustion gases to a fluidized bed
AssigneeAsea Stal Aktiebolag
InventorPer Thornblad
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeAsea Stal Aktiebolag
InventorPer Thornblad
Estimating the term…
A power plant with combustion of a fuel in a fluidized bed (14) enclosed within a combustion chamber in a bed vessel (11). A gas outlet from the bed vessel (11) is formed as a centrifugal separator (20) intended to primarily separate coarse material containing unburnt fuel leaving the bed (11) together with the combustion gases. Suitably the separator (20) extends into the bed vessel (11) and separated material is returned to the bed (14) through a return conduit (34), which is preferably located close to the bed vessel wall. This conduit (34) opens into the bed vessel (11), near the bottom (12) thereof. For the return transport an ejector (35) may be used to overcome the pressure difference existing between the separator (20) and the orifice of the conveying conduit (34). The propellent gas may consist of combustion air from the space (16). If the pressure difference between the space (16) and the orifice of the return tube (34) is insufficient to obtain the necessary driving power, a booster compressor (36) may be used to increase the pressure of the propellent gas.
A power plant with a bed vessel with combustion of a fuel in a fluidized bed of a particulate material and a cleaning plant for separation of solid particles in combustion gases leaving the bed vessel, characterized in that the cleaning plant comprises a coarse cleaner (20) close to the outlet from the combustion chamber (11) with return of separated material, said coarse cleaner including a first cylinder (30) with guide vanes (31) which impart a rotating movement to the gas flow, a second cylinder (32) downstream of the first cylinder (30), an annular gap (33) formed between the cylinders, a space around the second cylinder (32) into which the gap (33) opens out and in which separated material is collected, and a return conduit for returning separated material from said space to the bed, and downstream of the coarse cleaner a cleaner (21) of a cyclone type for separating solid particles which have passed through the coarse cleaner (20).
Dependencies are inferred from the claim text.