Economical use of air preheat

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

Patent

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F23J 15/06 (2006.01) F23L 15/04 (2006.01) F28D 21/00 (2006.01)

Patent

CA 2757021

An economical heat recovery system [100] is described for use in a boiler [26] includes an air preheater [150] that receives hot flue gasses [FG1] and inlet air and creates heated air [A2] and incremental air [A2']. The incremental air [A2'] is provided to a regenerative heat capture and transfer (RHCT) system [300] positioned to receive the incremental air [A2'] from the air preheater [150]. The RHCT includes a heat exchanger [310] that preheats feed water [WF1] for the boiler [26]. Since a heat exchanger [310] receives clean air as opposed to those of the prior are, it may be made more efficient with more heat exchange units in closer proximity, since there is little chance of blockage. Also, there is less maintenance with the present invention.

L'invention porte sur un système de récupération de chaleur économique [100] destiné à être utilisé dans une chaudière [26], lequel système comprend un préchauffeur d'air [150] qui reçoit des gaz de combustion chauds [FG1] et un air d'entrée, et qui créée un air chaud [A2] et un air supplémentaire [A2']. L'air supplémentaire [A2'] est délivré à un système de capture et de transfert de chaleur régénératif (RHCT) [300] disposé pour recevoir l'air supplémentaire [A2'] provenant du préchauffeur d'air [150]. Le RHCT comprend un échangeur de chaleur [310] qui préchauffe l'eau d'alimentation [WF1] de la chaudière [26]. Étant donné qu'un échangeur de chaleur [310] reçoit de l'air propre, contrairement à ceux de l'état de la technique, il peut être rendu plus efficace avec plus d'unités d'échangeur de chaleur à proximité plus étroite, étant donné qu'il y a peu de risque de blocage. De plus, la présente invention permet une maintenance plus faible.

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