Thermal and fluid design of a ceramic bayonet tube heat exchanger for high-temperature waste heat recovery
Abstract
A new ceramic recuperator has been developed to recover waste heat from high-temperature flue gas up to 2250F. The recuperator is comprised of a number of ceramic bayonet elements which are assemblies of two concentric tubes. The recuperator is a cross counterflow heat exchanger with both the inlet and the outlet plenums located at one end of the elements. As a result, the freely expanding elements greatly simplify the structure of the heat exchanger and eliminate thermal stress and stress related corrosion problems. Moreover, the relatively wide spacing between the elements would make them less likely plugged up by dirty flue gas. Thermal and fluid design of the recuperator requires an unconventional approach. The design of the recuperator and its major components is outlined here. Results from a prototype test indicated that the recuperator would function as predicted. The ceramic recuperator can effectively recover waste heat from high temperature flue gas.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- 1985
- Bibcode:
- 1985STIN...8616535L
- Keywords:
-
- Ceramics;
- Regenerators;
- Tube Heat Exchangers;
- Waste Heat;
- Waste Utilization;
- Flue Gases;
- High Temperature;
- Stress Corrosion;
- Thermal Stresses;
- Fluid Mechanics and Heat Transfer