| 摘要 |
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.
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