EP 0176293 B1 19910403 - RECIRCULATING FLUID BED COMBUSTOR - METHOD AND APPARATUS
Title (en)
RECIRCULATING FLUID BED COMBUSTOR - METHOD AND APPARATUS
Publication
Application
Priority
US 65430284 A 19840924
Abstract (en)
[origin: EP0176293A2] A fluidized bed combustor (10) for burning solid fuel or dirty liquid fuels comprised of a bubbling fluid bed (15) with heat exchanger tubes (13) in the bed, a hot recycle cyclone (21), a convective heat exchanger (26) and a particle filter (27). The bubbling fluid bed (B) is operated at low superficial velocities of 0.5 to 6 ft/second (0.15 to 1.8 m/s) and is composed of fine particulate 45 to 2000 microns in diameter with up to 40% less than 200 microns. Fines elutriated from the bed are isothermally recycled back to the bed resulting in high combustion efficiency and good sulphur oxide suppression from sorbents contained in the bed. The material recycled in one hour is equivalent to twice the weight of the bed. Ammonia (24) injected upstream of the recycle cyclone (21) suppresses nitrogen oxides with high efficiency because of the excellent mixing in the cyclone (21). The heat transfer coefficient on the tubes in the bed is increased at least 2 to 4 times because of the fine particulate nature of the bed. Fluidization occurs over a 10:1 range in superficial velocities.
IPC 1-7
IPC 8 full level
F23C 10/18 (2006.01); F22B 31/00 (2006.01); F23C 10/00 (2006.01); F23C 10/02 (2006.01); F23C 10/10 (2006.01); F23J 15/02 (2006.01)
CPC (source: EP)
F22B 31/0084 (2013.01); F23C 10/10 (2013.01); F23J 15/02 (2013.01)
Citation (examination)
- EP 0081619 A1 19830622 - SULZER AG [CH]
- EP 0112237 A1 19840627 - CREUSOT LOIRE [FR]
Designated contracting state (EPC)
DE FR GB SE
DOCDB simple family (publication)
EP 0176293 A2 19860402; EP 0176293 A3 19870422; EP 0176293 B1 19910403; CA 1271945 A 19900724; DE 3582385 D1 19910508; DK 429885 A 19860325; DK 429885 D0 19850923; JP H0799250 B2 19951025; JP S61105007 A 19860523; NO 853713 L 19860325
DOCDB simple family (application)
EP 85306529 A 19850913; CA 490743 A 19850913; DE 3582385 T 19850913; DK 429885 A 19850923; JP 20197185 A 19850913; NO 853713 A 19850923