| 摘要 |
<p>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.</p> |
