Eco design of insulating ceramic foams for high temperature application

Reference Presenter Authors
14-066 Vania Regina Salvini Salvini, V.R.(FATEC Sertãozinho); Pandolfelli, V.C.(Universidade Federal de São Carlos); Rodrigues, J.d.(Universidade Federal de São Carlos); Pelissari, P.B.(Universidade Federal de São Carlos); Santos Junior, T.d.(Universidade Federal de São Carlos); The main reasons of applying insulating ceramics as high temperature equipment linings are related to energy costs and environmental concerns. From the emission point of view, most of high temperature equipment operate in the infrared wavelength range (0.7 to 100 micra) where the thermal transmission by radiation is the major mechanism for the total effective thermal conductivity. This information is fundamental to design the composition and the microstruture of insulating ceramic materials. Considering the Infrared wavelengths, a good thermal insulating material must be able to reduce the intensity of radiation emitted within the temperature range of interest. There are two ways to reach this target: by adding substances which absorb part of the radiation in the wavelength range of interest and/or by introducing micropores to scatter the heat radiation. However, the effectiveness of each mechanism depends on the wavelength. In this work, eco design of insulating ceramics is presented focusing the alumina based foams for furnace lining operating at 1700oC in air. The performance of insulating ceramic was evaluated considering the energy consumed by the heating elements and the temperature profiles at different points of furnace. Power consumption indicated lower values when applying foamed ceramic lining compared to the commercial fiber-based ones. Additionally inputs on foams shape and compositions are presented, which can reduce the total effective thermal conductivity of insulating ceramics.
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