Regenerative heat exchanger and method of reducing gas...

F - Mech Eng,Light,Heat,Weapons – 28 – D

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F28D 19/04 (2006.01) F28F 27/00 (2006.01)

Patent

CA 2759943

A heat exchanger (500) for transferring heat between a first gas flow (28), such as flue gases, and a second gas flow (34), such as air or oxygen, includes a housing (514) having a first inlet plenum (520) for receiving the first gas flow (28), a first outlet plenum (522) for discharging the first gas flow (28), a second inlet plenum (526) for receiving the second gas flow (34), and a second outlet plenum (528) for discharging the second gas flow (34). The heat exchanger (500) further includes heat exchange elements (512) disposed within the housing (514). Radial seals (224, 226, 228, 230) are disposed between the housing (514) and the heating elements (512) that define a radial plenum (535, 536). Axial seals (220, 222) are further disposed between the housing (514) and the heating elements (512) to define an axial plenum (530). A third gas flow, such as recirculated flue gas, is provided in the radial plenum (535, 536) and the axial plenum (530) to reduce the leakage between the first gas flow (28) and the second gas flow (34).

L'invention porte sur un échangeur de chaleur 500 pour transférer de la chaleur entre un premier flux de gaz 28, tel que des gaz de carneau, et un second flux de gaz 34, tel que de l'air ou de l'oxygène, lequel échangeur de chaleur comprend un boîtier 514 ayant un premier plenum d'entrée 520 pour recevoir le premier flux de gaz 28, un premier plenum de sortie 522 pour décharger le premier flux de gaz 28, un second plénum d'entrée 526 pour recevoir le second flux de gaz 34 et un second plénum de sortie 528 pour décharger le second flux de gaz 34. L'échangeur de chaleur 500 comprend en outre des éléments d'échange de chaleur 512 disposés à l'intérieur du boîtier 514. Des joints d'étanchéité radiaux 224, 226, 228, 230 sont disposés entre le boîtier 514 et les éléments chauffants 512 qui définissent un plénum radial 535, 536. Des joints d'étanchéité axiaux 200, 222 sont en outre disposés entre le boîtier 514 et les éléments chauffants 512 pour définir un plénum axial 530. Un troisième flux de gaz, tel que des gaz de carneau amenés à recirculer, est fourni dans le plénum radial 535, 536 et le plénum axial 530 pour réduire la fuite entre le premier flux de gaz 28 et le second flux de gaz 34.

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