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The aim of the work was modeling of cooling process dynamics of a combustion boiler and designing of the method, which is suitable for calculation of cooling time in a large scale of temperature. Methods were verified with the use of referential combustion boiler with heat output of 130 kW. This boiler burned mixture of waste sawdust and shavings originating in the course of production of wooden furniture. For these purposes specialized experimental device has been used. Cooling curves were measured in interval from 380 °C to 50 °C and were described by using of polynomial function. The cooling time was calculated by using of polynomial function in full temperature scale for cooling of combustion boiler refractories lining, from 700 °C to 50 °C.

The work describes actions carried out in colaboration among the National Steel Company - (CSN)-Brazil and the Interdisciplinary Laboratory of Electrochemistry and Ceramic - LIEC of the Federal University of Sao Carlos Brazil (UFSCar- Brazil), in the area of I&D, for integral management and improvement of the quality and performance of the refractory linings in the sintering areas, blast furnace, hot air pipe lines transferency to the blast furnace, pig-iron ladles, running channels, blast furnaces hearths, torpedo car, etc., as well as, the economic impact generated by the installation of the adopted measures.El trabajo describe acciones realizadas en conjunto entre la Compañía Siderúrgica Nacional – (CSN)-Brasil y el Laboratorio Interdisciplinar de Electroquímica y Cerámica – LIEC de la Universidad Federal de Sao Carlos Brasil (UFSCar) - Brasil, en el área de I&D, para la gestión y mejora de la calidad de los revestimientos refractarios en las áreas de sinterización, hornos altos, líneas de trasferencia de aire caliente al horno alto, piqueras de arrabio, canales de colada, crisoles de horno alto, cucharas torpedo, etc., así como, el impacto económico generado por la implantación de las medidas adoptadas.