Aproveitamento de biomassa de madeira como fonte de geração renovável de energia: estudo de caso

Abstract

The proposal of this work was to study the feasibility of implanting a cogeneration system from biomass, using the waste from a primary wood industry (sawmill). This hypothetical industry was conceived in operations of the same type and size already in the southern region of Brazil, which use reforestation woods such as pine and eucalyptus. As wood industries use steam in the drying process of the lumber through the burning of the residue in boilers it is suggested to insert a new boiler (superheated steam), a turbine and a generator in order to implant a cogeneration to supply the energy demand Of this industry and obtaining revenue from the sale of surplus energy generated. For this study, some premises were established in relation to the industrial operation and the need for steam to process, mainly used for drying the wood in steam greenhouses. In the analysis the mass balance was made to quantify the available residue and to size the boiler and the turbine in function of this availability to define the capacity of generation of energy. Based on the calculations of the energy need of the industry one can evaluate the cost to be avoided with the purchase of electric power from the local concessionaire and a revenue from the sale of surplus energy generated in cogeneration. Through the calculations of the VPL, TIR of Payback, it was possible to verify the feasibility of this enterprise.