Resumo

FORERO NUNEZ, Carlos Andrés; LOPEZ MA, Germán Arturo  e  SIERRA VARGAS, Fabio Emiro. Energy efficiency evaluation of an innovative vertical axial rotary kiln for pottery production. Tecnura [online]. 2015, vol.19, n.43, pp.93-105. ISSN 0123-921X.  https://doi.org/10.14483/udistrital.jour.tecnura.2015.1.a07.

Colombia is a remarkable coal producer and exporter worldwide; several sectors use this resource for electricity and thermal energy production. Among them, the ceramic industry consumed 118,590 tons in 2011. Most of the pottery production companies in this country are located in rural areas and use old coal fired kilns with low energy efficiencies, generating environmental effects to the population nearby. Despite of the importance of these industries to the small rural economies, the government agencies have closed them due to the lack of development on cleaner devices. This work aims to analyze the thermal behavior of an innovative vertical axial rotary kiln for pottery production, and the energy efficiency varying operation mode. The kiln, operated during seven hours, needed three hours for stabilizing the sintering temperature at 800°C. The mean temperatures of the loading, drying, sintering and cooling stage were 204°C, 223°C, 809°C and 321°C respectively. The convection and radiation heat losses were 15% whereas the flue gas heat losses 18%.During continuous operation, the kiln energy efficiency was about 60%. This design proven to reach the temperatures required in the firing stage of the pottery production; moreover, a gas fuel was fuelled making the process cleaner and more efficient than coal-fired systems.

Palavras-chave : combustion; energy efficiency; pottery; rotary kiln.

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