Storage-Fluid Maintenance Study Using Caloria HT-43 Hydrocarbon Oil. Final Report for September 1977 to November 1978.

摘要

Thermal energy storage concepts using hydrocarbon oils are being considered in first generation solar thermal power feasibility studies and plant development efforts. The thermal degradation characteristics of Exxon's Caloria HT-43 oil have been investigated. The program has been accomplished under two phases of effort. Phase I has studied the thermophysical effects of oil degradation in a partially vented storage tank at 316 exp 0 C (600 exp 0 F) for a period of 1000 hours. Phase II has examined the effect of a sidestream processor (vacuum distillation column) on oil degradation in a vented storage tank. Test results indicate that the thermal degradation process is autocatalytic. Therefore, both tank venting and oil reprocessing can actually reduce the degradation rate. The experimentally determined degradation rates under the two phases of effort were, in Phase I, 2.4 percent by weight per week and, in Phase II, 0.1 percent by weight per week. However, computed fluid replenishment rates were in Phase I and II, 1.1 and 0.8 percent, respectively. Improved processor designs could substantially lower the 0.8 percent per week observed for the Phase II sidestream processor. (ERA citation 07:059412)