Desenvolvimento de um gerador de gás quente e identificação do seu potencial para a secagem de grãos

• Autor(a) principal: Costa, Douglas Romeu da
• Data de Publicação: 2010
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/689
• topic: Queimador a gás; Energia; Gas burner; Energy; CNPQ::CIENCIAS AGRARIAS::ENGENHARIA AGRICOLA::ENERGIZACAO RURAL

The objective of this study was to develop and evaluate the performance of a gas heater for drying of agricultural products. A heater was coupled to a fixed bed dryer in rows for execution of the tests. The gas nozzles were sized and tested with inclinations of 25 and 45 degrees. Drying air temperature was controlled at 60 and 100°C. Combustible LPG was used to heat the drying air. Maize grain (Zea mays L.) with an initial moisture content of 12.0% w.b. was used in the experiment. To evaluate the performance of the gas heater, the thermal efficiency, flame characteristics and composition of the combustion gases were analyzed. From the results, it was possible to verify that the utilized methodology is adequate for sizing of the heater, considering the characteristics of the experimental prototype. Concentrations of carbon monoxide were measured which indicate that combustion was complete and that the heater was operated correctly. Flames formed in the gas heater demonstrated that combustion was both stable and regular. The gas heater presented a thermal efficiency comparable with values encountered in literature, and possesses the potential to provide quality heated air for grain drying with no risk of contamination.