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Technical Briefs

Operation Analysis and Thermoeconomic Evaluation of a Cogeneration Power Plant Operating as a Self-Generator in the Ecuadorian Electrical Market and Sugar Industry

[+] Author and Article Information
Washington Orlando Irrazabal Bohorquez

e-mail: wirraz@ita.br

João Roberto Barbosa

Professor
Mem. ASME
e-mail: barbosa@ita.br
Center for Reference on Gas Turbines,
Instituto Tecnológico de Aeronáutica,
12228-900, São José dos Campos, SP, Brazil

Luiz Augusto Horta Nogueira

EXCEN—Center for Excellence on Energy Efficiency,
Federal University of Itajuba,
37500-903, Itajuba, MG, Brazil
e-mail: horta@unifei.edu.br

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received December 17, 2010; final manuscript received June 23, 2012; published online August 7, 2012. Assoc. Editor: Kau-Fui Wong.

J. Energy Resour. Technol 134(4), 044501 (Aug 07, 2012) (8 pages) doi:10.1115/1.4007086 History: Received December 17, 2010; Revised June 23, 2012

This study evaluates the integral use of the sugarcane bagasse on the productive process of a cogeneration power plant in an Ecuadorian Sugar Company. Thermoelectric power plants burning biomass require a large initial investment and, for example, this initial investment requires $800/kW, which is double the initial investment of a conventional thermoelectric power plant that is $400/kW, and almost similar to the initial cost of a hydroelectric power plant that is $1000/kW. A thermoeconomic study was made on the production of electricity and the sales of the exceeding 27 MW average. From the results, it was concluded that generated electricity costs are $0.0443/kW h, in comparison with the costs of the supplied electricity through fossil power plants with values in the range $0.03–$0.15/kW h and hydroelectric power plants with a value of about $0.02/kW h. Cogeneration power plants burning sugarcane bagasse could contribute to the mitigation of climatic change. This specific case study shows the reduction of the prospective emissions of greenhouse effect gases in the amount of 55,188 ton of CO2 equivalent per year.

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References

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Figures

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Fig. 1

Simplified thermal scheme of cogeneration power plant

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Fig. 2

Curves of thermal and electricity demand

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Fig. 3

Curves of electricity surpluses

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Fig. 4

Logical structure of the cogeneration facility

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Fig. 5

Exergoeconomic costs based on boiler efficiency

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Fig. 6

Electricity and steam costs based on boiler efficiency

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Fig. 7

Exergoeconomic costs based on fuel costs

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Fig. 8

Electricity and steam costs based on fuel costs

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