Abstract
The heat exchanger designed for a boiler exhaust gas near the sulfuric acid dew point was examined with carbon fiber reinforced phenol FRP. The evaluation of physical degradation by mechanical strength shows mechanical properties degraded step by step, and “S” element analysis on the specimen cross section indicated permeation/ diffusion mechanism of the environment into CFRP at high temperature and high concentration condition. The evaluation of chemical degradation by IR analysis was also carried out based on time temperature superposition principle. The IR-index data from many temperature and concentration conditions were well obeyed to the law. Life estimation was examined and the change of flexural strength was well estimated by this method.
