抄録
In previous studies, we developed an inverse method to estimate the thickness of refractory in two-layered structure composed of refractory and steel plate. In the proposed method, outer temperature change on the steel plate was measured when periodic temperature fluctuation was applied on the inner refractory side. Then, obtained delay time of the outer temperature change against inner temperature change due to thermal conduction was inversely analyzed to estimate the thickness of refractory. In the previous report, we investigated the feasibility of the inverse analysis was demonstrated for the hot-blast stove in steel mills. In this paper, the authors investigated the estimation errors of the thickness of refractory by the inverse analyses and factors influencing on them, based on the experimental studies using small two-layered combined plane specimens and finite element analysis. It was found that the refractory thickness estimated by inverse analyses were influenced by several factors such as in-plane thermal conduction, waveform of the temperature fluctuation on the inner surface. However, effects of these factors are not significant in the case of thickness estimation of refractories of the large scale actual hot-blast stove, and the proposed method is found to be effective for actual applications.
