Development of a ceramic tube heat exchanger with relaxing joint. Interim technical progress report, January 1977--May 1978
Three tube materials were selected as primary candidates for the ceramic heat exchanger test module. These materials (..cap alpha..-sintered silicon carbide, Carborundum; sintered silicon carbide, NC 430, Norton; Super KT silicon carbide, Carborundum) were evaluated. Radial compression tests on all of the above materials were completed. Strength data are statistically recorded in this report. None of the ceramics tested has sufficient strength to be used without thermal expansion provision between the ceramic tubes and metal shell (strengths above 100 ksi are required), and tubes conncected to the same heater (strengths above 20 ksi are required). All of the materials tested to date were impermeable to air at 100 psi and temperatures up to 1600/sup 0/F. Environmental rig tests of KT silicon carbide tubes with Homer City flyash at an air temperature of 1260/sup 0/C (2300/sup 0/F) and 1037/sup 0/C (1900/sup 0/F) and a tube temperature of 1148/sup 0/C (2100/sup 0/F) and 871/sup 0/C (1900/sup 0/F) were completed. Three distinct temperature zones were identified in tube rig tests for the Homer City power plant flyash; nonsticking, sticking and flyash melt-off. Gas tight permanent joints have been made and have completed up to 50 hours of endurance testing at pressure and temperature. A ceramic to metal spherical compression joint has been designed and tested at 704/sup 0/C (1300/sup 0/F) with an internal gas pressure of 80 psig and endload of 20 kg (44 lbs) for 25 hours without leakage. Design of a counter-axial flow tube and shell heat exchanger has been completed and construction started. The new improved relaxing glass joint will be incorporated into the module during the module's test program.
- Research Organization:
- Solar Turbines International, San Diego, CA (USA)
- DOE Contract Number:
- EF-77-C-01-2556
- OSTI ID:
- 6165295
- Report Number(s):
- FE-2556-17
- Country of Publication:
- United States
- Language:
- English
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Development of a ceramic tube heat exchanger with relaxing joint. Monthly technical progress report, August 1--September 1, 1977
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Related Subjects
36 MATERIALS SCIENCE
01 COAL, LIGNITE, AND PEAT
CERAMICS
MECHANICAL PROPERTIES
FLY ASH
CHEMICAL COMPOSITION
HEAT EXCHANGERS
DESIGN
MATERIALS
GLASS
SILICON CARBIDES
SILICON NITRIDES
TEMPERATURE DEPENDENCE
THERMAL CONDUCTIVITY
VERY HIGH TEMPERATURE
AEROSOL WASTES
CARBIDES
CARBON COMPOUNDS
NITRIDES
NITROGEN COMPOUNDS
PHYSICAL PROPERTIES
PNICTIDES
SILICON COMPOUNDS
THERMODYNAMIC PROPERTIES
WASTES
420400* - Engineering- Heat Transfer & Fluid Flow
360203 - Ceramics
Cermets
& Refractories- Mechanical Properties
010800 - Coal
Lignite
& Peat- Waste Management