| 摘要 |
<p>A heat exchanger for high temperature operation has a ceramic-walled chamber (2, 40) traversed by ceramic tubes (6, 50) and is capable of use inter alia in fluidised bed applications. The tubes are arranged in series of successive banks and to give a compact arrangement the successive banks of tubes (50, 50a) at different levels are disposed transversely to each other. The tubes may have internal and external reinforcing means (12, 14 and 82, 82a) to allow them to withstand the loads imposed by the fluidised bed and generally to allow longer tubes to be used in ceramic constructions. The internal reinforcing means (14) may also provide restrictions that in fluidised bed applications can function to minimise the effects of tube wall fracture by reducing carry-over of bed particles seeping into the tubes. For improved end sealing, means (14a or 17) can be provided to hold resilient ceramic seals compressed against the tube ends while permitting axial thermal movement of the tubes.</p> |
