Economic Evaluation of Cogeneration System in Asphalt Plant

Liodoro de Mello, Conrado Augustus de Melo, Reynaldo Palacios Bereche

Abstract


Abstract: This article proposes the introduction of an energy cogeneration system on an asphalt paving plant, located in the municipality of Juiz de Fora, Minas Gerais. Asphalt plants generally produces bituminous asphalt at high temperatures releasing greenhouse gases into the atmosphere and cogeneration is a solution which would represents environmental and economic benefits. The work details the process of cogeneration based on natural gas taking into account thermal input and output, as well as the possibilities of produce simultaneously heat and power for the asphalt process, and the installation of a gas turbine. Energy balances were accomplished to quantify the energy flows and monetize the operational costs in order to evaluate and compare two scenarios:  scenario (C1), without cogeneration and scenario (C2), with cogeneration. Moreover, an economic assessment was done evaluating the energy and monetary savings and also the payback, which resulted 2.6 years. The results validated the feasibility of a cogeneration system at the plant, which will take advantage of produce thermal energy and electricity, and as a self-producer of electricity, generate electricity surplus that can be sold to the grid.

Keywords: cogeneration; energy; economy; natural gas; asphalt.


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