Patent ID: 6923128

Claim:
Circulating fluidized bed reactor comprising: a reactor chamber; at least one duct connected with the reactor chamber for drawing off a flue gas having entrained solid particles from the reactor chamber; at least one cyclone separator that is connected with the duct for separating solid particles from the flue gas; at least one recirculation device for recirculating at least a portion of the separated solid particles from the cyclone separator into the reactor chamber, the at least one recirculation device comprising a single siphon-trap gas seal including a single riser having a circumference, an upper end, and first and second outlet openings on the circumference of the riser proximate to the upper end, the first and second outlet openings pointing substantially in the direction of the reactor chamber, a single device for fluidizing the portion of the separated solid particles, and a device for connecting each opening of the gas seal riser with the reactor chamber.