B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 53/56 (2006.01) B01D 53/50 (2006.01) B01D 53/60 (2006.01) B01D 53/86 (2006.01) C10L 9/10 (2006.01) F23C 10/10 (2006.01) F23C 10/16 (2006.01) F23D 11/02 (2006.01) F23J 15/02 (2006.01)
Patent
CA 2086575
The amount of N2O in flue gases discharged from a first fluidized bed combustion system is minimized by adding an N2O decomposing catalyst in a reactor stage downstream of the combustor. The catalyst preferably is a calcium based sorbent, such as CaO or limestone, although NiO and other catalysts also may be utilized. Typically, the N2O decomposition takes place without increasing the temperature of the flue gases above the 700-1000°C level that exists in the combustor. However, under some circumstances, if a second fluidized bed is provided as the reactor stage, additional fuel and oxygen can be added to increase the temperature of the flue gases to insure that it is over 800°C After N2O decomposition, the flue gases may be passed through pressurized filter tubes, or through a superheater, economizer, air preheater, optional cyclone separator, and baghouse filter A cyclone separator is preferably provided between the combustor and reactor stage, and the removed particles are recirculated to the combustor. Removal of particles, including unused sorbent, after the reactor stage also preferably takes place, with recycle to the reactor stage (if a fluidized bed stage) and/or to the combustor.
Engstrom Folke
Hupa Mikko
Lee Yam Y.
Lundqvist Ragnar
Engstrom Folke
Foster Wheeler Energia Oy
Gowling Lafleur Henderson Llp
Hupa Mikko
Lee Yam Y.
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