Gaseificação de briquetes de casca de eucalipto.

Abstract

The thermal use of the gasified biomass brings the great advantage of an extremely clean burning of the fuel gases, as compared to the direct burning of the biomass. The use of the biomass constituted by wood and agricultural residues as an energetic alternative, through the briquetting, has been stimulated by the fact that such residues consist, in general, of materials particled with non uniform dimensions; their low densities increase the transport and storage costs and, in addition, they have low commercialization prices. This work was developed to evaluate the technical viability of the use of briquettes of eucalyptus bark for air heating through a gasification reactor of concurrent flow coupled with a combustion chamber for the produced gases. The gasification/combustion process of briquettes generates hot air exempt of smoke and impurities. The relative moisture during the tests, on average, was of 45%. The system exhibited average thermal efficiencies of 42,8% and global efficiencies of 78%. The average fuel consumption was 30 kg.h-1. The average air temperature in the exit of the system was 108ºC.