High-efficiency enhanced boiler

F - Mech Eng,Light,Heat,Weapons – 22 – B

Patent

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Details

F22B 23/06 (2006.01)

Patent

CA 2535855

In devices known in the art, "conven-tional firetube" and "waste heat recovery" boilers each require many small tubes making successive passes within the boiler. In one embodiment of the invention, however, an enhanced conduit (60) replaces numerous conventional small tubes. In some embodiments, the enhanced conduit incorporates a plurality of fins (80), each of which extends through a wall of the conduit. In other embodiments, the enhanced conduit incorporates a plurality of tubes (494) along its outer surface, through which a heat transfer medium flows. Both designs enhance the heat transfer relationship between the hot fluid and the heat transfer medium by providing a continuous heat transfer relationship with the heat transfer medium, increasing the surface area involved in the heat transfer relationship and enhancing convection/conduction couples. For some applications, all of the tube banks of other devices in the art can be replaced by one continuous enhanced conduit.

Les dispositifs connus tels que les chaudières à </= tubes de chauffe classiques >/= et les chaudières à </= récupération de chaleur >/= nécessitent tous de nombreux tubes de petite dimension formant des passages successifs à l'intérieur de la chaudière. Dans un monde de réalisation, l'invention concerne à un conduit perfectionné remplaçant plusieurs petits tubes classiques. Dans certains modes de réalisation, ce conduit perfectionné comprend une pluralité de nervures traversant chacune une paroi du conduit. Dans d'autres modes de réalisation, le conduit perfectionné comporte une pluralité de tubes sur sa surface externe, dans lesquels s'écoule un agent de transfert thermique. Ces deux conceptions améliorent le rapport de transfert thermique entre le fluide chaud et l'agent de transfert thermique en créant un rapport de transfert thermique continu avec l'agent de transfert thermique, en augmentant la surface impliquée dans le rapport de transfert thermique et en améliorant le couple convection/conduction. Dans certaines applications, toutes les rangées de tubes des autres dispositifs de ce type peuvent être remplacées par un seul conduit perfectionné continu.

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