Resumen

GOLATO, Marcos A.; ASO, Gustavo; PAZ, Dora  y  CARDENAS, Gerónimo J.. Injection of heated secondary air in steam bagasse boilers and its influence on thermal efficiency. Rev. ind. agríc. Tucumán [online]. 2005, vol.82, n.1-2, pp.17-25. ISSN 1851-3018.

Previously heated secondary air injection is evaluated as an alternative to increase thermal efficiency of bagasse steam boilers. Aspects regarding the combustion process and the factors affecting it are also described. Tests were made in a bagasse boiler of a sugar mill. Thermal efficiency of the bagasse boiler with cold secondary air injection was determined by solving mass and energy balances. A new thermal efficiency for the case in which all secondary air is pre-heated with hot gases was determined afterwards. Finally, a technical-economic analysis was made to evaluate the yield of this technology, taking into account bagasse saving and its equivalent in natural gas. For the analyzed case, the results showed: an increase in the thermal efficiency of the boiler (1,62 points); a higher steam production index (2,27%); a reduction in bagasse consumption (2,45%); an acceptable payback period of the investment (114 days of the harvest season).

Palabras clave : Energetic efficiency; Combustion; Turbulence; Overfire.

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