Fast fluidized bed boiler and a method of controlling such a...

F - Mech Eng,Light,Heat,Weapons – 23 – C

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F23C 10/28 (2006.01) B01J 8/24 (2006.01) F22B 31/00 (2006.01) F23C 10/08 (2006.01) F23J 3/04 (2006.01) F23J 15/02 (2006.01)

Patent

CA 1225292

ABSTRACT A completely cooled fast fluidized bed boiler com- prises a reactor (4) having a bottom section (3), an integrated primary non-centrifugal mechanical particle separator (5), a gas pass (7) containing convective heat exchangers (10), and means (6,8,9) for controllably recirculating separated particles into the reactor bottom section (3). Reactor (4), separator (5) and gas pass (7) are built as an integrated unit within one and the same cooling system. The boiler is controlled by maintaining the bed temperature substantially constant or within a relatively narrow temperature interval by regulating the recirculation rate dependent on boiler load. For regu- lating the recirculation rate a non-mechnical valve, pre- ferably a so-called L-valve (8), is used. (Fig. 1)

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