Eventos Anais de eventos
ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
ENERGY RECOVERY FROM CHARCOALPRODUCTION IN BRAZIL: CASE STUDY
Submission Author:
Marcio Montagnana Vicente leme , SP
Co-Authors:
Osvaldo Jose Venturini, Mateus Rocha
Presenter: Osvaldo Jose Venturini
doi://10.26678/ABCM.ENCIT2016.CIT2016-0482
Abstract
Brazil is the largest world charcoal producer, thanks to its use in the pig iron industry. Most of this charcoal comes from the slow pyrolysis of eucalyptus wood, produced in large reforestation farms. Generally, the carbonization technology comprises the use of a batch process, using big auto-thermal brick kilns, based on the Missouri kiln technology. Unfortunately, the residual gases produced by this process, which states for 35% of wood energy, are wasted, decreasing the air quality and producing a very negative environmental and social impact. This work assess the possibility to recovery this energy to produce electricity, and issues the main subjects related to the use of a very lean gas fuel, which varies its composition over time, and the lack of water to be used as cooling mean for the thermodynamic cycles in the farms. Results, based on a case study, shows an energy potential of 74 MWt, using a kiln cluster system coupled with an air-cooled steam power plant, capable to produce about 1,4 MWhe per ton of charcoal produced, and recovering about 10% of initial wood energy.
Keywords
Energy Recovery, Charcoal, Eucalyptus, pyrolysis, renewable energy, Energy Recovery, Charcoal, Eucalyptus, pyrolysis, renewable energy
