High temperature ceramic coatings for energy saving applications

Reference Presenter Authors
14-057 Eric Yoshimitsu Sako Sako, E.Y.(Federal University of Sao Carlos); Pandolfelli, V.C.(Universidade Federal de São Carlos); Pelissari, P.B.(Universidade Federal de São Carlos); de Meo, C.E.(Universidade Federal de São Carlos); According to the last released reports, only 13.4% of world total primary energy supply accounted for renewable energy, such as hydro, biofuel, solar, and others. That issue should be carefully addressed, especially when thinking that energy is currently consumed from the very straightforward process of warming up water for cooking to the ultramodern industrial processes, which consume energy on a daily basis. In fact, most of the total energy consumption comes from the industrial sector, which means that although keeping your television off may lead to almost no impact on the overall energy balance, a large difference may be achieved when reducing the energy used in the manufacturing operations. The present work addresses the direct impact of the refractory industry on the imminent energy crisis, and how thermal-optical coatings applied on the refractory walls in high temperature processes could arise as a relevant solution from the energy saving standpoint. One precise example is the steel industry, whose production process is comprised of a dozen of steps taking place at 1,400°C or more. During the entire route, either the molten metal or the vessel lined with refractories must be often re-heated in order to avoid any temperature drop. An efficient tool to enhance the thermal efficiency of such process could be the use of engineered ceramic coatings. Coatings are widely used as a complementary material on the surfaces of walls, bricks and tubes, adding improved specific properties without changing the materials bulk composition. A high-emissivity coating, for instance, may maximize the heat flux in a combustion chamber and improve the process efficiency, even if the original wall bricks still comprise low absorber components. Through the evaluation of the fundamentals on thermal-optical properties, the use of numerical simulation and field cases experience, a systemic view on high temperature ceramic coatings and their energy saving potential is presented.
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