Ceramic heat exchanger system

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

Patent

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Details

F28F 9/06 (2006.01) F27D 17/00 (2006.01) F28F 9/02 (2006.01) F28F 21/04 (2006.01)

Patent

CA 2218042

A heat exchanger (10) provided with ceramic tubes (60) is disclosed, for use as a recuperator in a furnace for example, which provides a tube-to-tube sheet seal including two tile pieces (58, 59) engaging a ball seal (70) which holds the ends of the ceramic tubes in the tube sheet assemblies (51). The ball seals permit axial and angular movement of the tubes (60) relative to the tube sheet assemblies (51) to reduce tube breakage and seal failures due to differential thermal expansion and the brittleness of the ceramic tubes. The tube sheet assemblies (51) are metallic and are designed with a double wall configuration containing cooling ducts (65) to prevent melting due to excessive temperatures.

Cette invention concerne un échangeur de chaleur (10) équipé de tubes en céramique (60) et servant de récupérateur, par exemple dans un four. Cet échangeur de chaleur comprend un élément d'étanchéité tube/plaque tubulaire comprenant deux éléments tuiles (58, 59) entrant en contact avec un obturateur à balle (70), lequel maintient les extrémités des tubes en céramique dans les dispositifs de plaques tubulaires (51). Les obturateurs à balle permettent le mouvement axial et angulaire des tubes (60) par rapport aux dispositifs de plaques tubulaires (51) de manière à réduire les risques de rupture des tubes et les défaillances des éléments d'étanchéité dus aux dilatations thermiques différentielles et à la fragilité des tubes en céramique. Les dispositifs de plaques tubulaires (51) sont en métal et possèdent une configuration à doubles parois, lesquelles contiennent des conduites de refroidissement (65) permettant d'éviter toute fusion due à des températures excessives.

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