Air-fired co2 capture ready circulating fluidized bed heat...

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

Patent

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Details

F23C 10/10 (2006.01) F23J 15/00 (2006.01) F23J 15/06 (2006.01) F23L 15/04 (2006.01)

Patent

CA 2712870

A combustor (110) combust a fluidized bed of fossil fuel (114, 114') to heat a working fluid (102) and generate flue gas (104). An air preheater (144) has first and second gas passageways (144a, 144b) for respectively directing the generated flue gas (150) and another gas (250) with captured CO2 generated by combustion outside of the combustor (110). When operated in a non-CO2 capture, the air preheater (144) receives the flue gas (150), but not the other gas (250), and the first gas passageway (144a) directs the flue gas (150) so as to preheat the air (188). However, when operated in the CO2 capture mode, the air preheater (144) receives the flue gas (150) and the other gas (250), and the second gas passageway (144b) also directs the other gas (250) so as to preheat the air (188'). In either mode, the preheated air (188, 188') is applied by the combustor (110) to fluidize a bed of fossil fuel (114, 114').

L'invention concerne un système dans lequel un brûleur 110 assure la combustion dun lit fluidisé de combustible fossile 114, 114' de façon à chauffer un fluide 102 de travail et à générer un gaz 104 de combustion. Un préchauffeur 144 dair est doté dun premier et dun deuxième passage 144a, 144b de gaz destinés à diriger respectivement le gaz 150 de combustion généré et un autre gaz 250 avec du CO2 capturé généré par combustion à lextérieur du brûleur 110. Lors de lexploitation sans capture du CO2, le préchauffeur 144 dair reçoit le gaz 150 de combustion, mais pas lautre gaz 250, et le premier passage 144a de gaz dirige le gaz 150 de combustion de façon à préchauffer lair 188. En revanche, lors de lexploitation en mode avec capture du CO2, le préchauffeur 144 dair reçoit le gaz 150 de combustion et lautre gaz 250, et le deuxième passage 144b de gaz dirige également lautre gaz 250 de façon à préchauffer lair 188'. Dans un mode comme dans lautre, lair préchauffé 188, 188' est appliqué par le brûleur 110 pour fluidiser un lit de combustible fossile 114, 114'.

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