EP 0431163 B1 19951206 - COMPOSITE CIRCULATION FLUIDIZED BED BOILER.
Title (en)
COMPOSITE CIRCULATION FLUIDIZED BED BOILER.
Title (de)
WIRBELBETTOFEN MIT VERBUNDUMLAUF.
Title (fr)
CHAUDIERE A LIT FLUIDISE A CIRCULATION COMPOSITE.
Publication
Application
Priority
- JP 8900883 W 19890830
- JP 21513588 A 19880831
Abstract (en)
[origin: EP0431163A1] This invention relates to a composite circulation fluidized bed boiler. A fluidized bed portion of the fluidized bed boiler is divided by a partition into a main combustion chamber and a heat recovery chamber, and at least two kinds of air chambers, i.e. an air chamber for providing a large fluidizing speed to a fluidization medium and an air chamber for providing a small fluidizing speed are provided. The combination of air having different fluidization speeds and jetted from these air chambers generates a swirling circulation flow in the fluidization medium inside the main combustion chamber and a circulation flow of the fluidization medium is generated between the main combustion chamber and the heat recovery chamber. Inside the heat recovery chamber, heat recovery of an exhaust gas is made at a free board portion or downstream of the free board portion in an internal circulation fluidized bed boiler for lowering the fluidization medium in the form of the fluidized bed, and after the temperature of the exhaust gas is lowered, the exhaust gas thus cooled is led into a cyclone and the char in a fine particle form collected by the cyclone is returned to the portion immediately above, or into, the lowering moving layer of the fluidization medium in the main combustion chamber and/or the heat recovery chamber. Since the char is returned immediately above or into the lowering moving layer of the fluidization medium, it does not immediately scatter to the free board portion. Accordingly, though it is the fine particles, it sediments and diffuses sufficiently into the fluidized bed so that NOx generated by the combustion of coal or the like inside the layer can be reduced.
IPC 1-7
IPC 8 full level
F22B 31/00 (2006.01); F23C 10/02 (2006.01)
CPC (source: EP KR)
F22B 31/0084 (2013.01 - EP); F22B 31/0092 (2013.01 - EP); F23C 10/00 (2013.01 - KR); F23C 10/02 (2013.01 - EP)
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI LU NL SE
DOCDB simple family (publication)
EP 0431163 A1 19910612; EP 0431163 A4 19920520; EP 0431163 B1 19951206; AT E131271 T1 19951215; AU 4199889 A 19900323; CA 1332685 C 19941025; CN 1017469 B 19920715; CN 1041646 A 19900425; DE 68925033 D1 19960118; DE 68925033 T2 19960515; KR 100229691 B1 19991115; KR 900700822 A 19900817; MY 104683 A 19940531; WO 9002293 A1 19900308
DOCDB simple family (application)
EP 89909857 A 19890830; AT 89909857 T 19890830; AU 4199889 A 19890830; CA 610057 A 19890831; CN 89107888 A 19890831; DE 68925033 T 19890830; JP 8900883 W 19890830; KR 890702496 A 19891229; MY PI19891666 A 19891130