Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
THERMAL PERFORMANCE OF A DOMESTIC BOILER BURNING BRIQUETTES MADE FROM PRUNING WASTES
Submission Author:
Carlos Pinho , Portugal , Brazil
Co-Authors:
Géssika Morgado, Victor Ferreira, Aida Sanches, Alexandra Pinto, Carlos Pinho
Presenter: Carlos Pinho
doi://10.26678/ABCM.COBEM2019.COB2019-0124
Abstract
The thermal performance of a domestic boiler fed with different biofuels was experimentally evaluated. The biofuels were from vine and kiwi pruning wastes and also pine wood dust, densified as briquettes. The thermal efficiency of the boiler was determined in steady state operating conditions, either through the direct method or through the indirect method, and the conclusion was that the best performance was achieved when burning briquettes made from kiwi pruning wastes. In terms of combustion hygiene, no tested fuel respected the 600 ppm limit for the gaseous emissions, as defined by the EN 14785:2008, although as far as the EN 12809:2015 was concerned, the carbon oxide upper limits were respected by all tested fuels. The briquettes made only with vine pruning wastes, with around 4400 ppm was the worst performer, namely undergoing a rather slow combustion rate with strong ash release. Mixing it with pine dust, in 5:1 vine to pine proportion, lead to a remarkable combustion performance upgrade, reaching a CO emission reduction of 40%. The briquettes made only with kiwi fruit pruning wastes, released around 3500 ppm, presenting a reduction to 970 ppm by heating the boiler feed water.
Keywords
Biomass, Combustion, Briquettes, Thermal Efficiency
