Research Papers

Exergy Analysis of the Annual Operation of a Sugarcane Cogeneration Power Plant Assisted by Linear Fresnel Solar Collectors

[+] Author and Article Information
Juan Camilo López

Department of Mechanical Engineering,
Technological University of Pereira,
Pereira 660003, Colombia
e-mail: juacamlopez@utp.edu.co

Álvaro Restrepo

Department of Mechanical Engineering,
Technological University of Pereira,
Pereira 660003, Colombia
e-mail: arestrep@utp.edu.co

Edson Bazzo

Department of Mechanical Engineering,
Federal University of Santa Catarina,
Florianopolis 88040-900, Brazil
e-mail: e.bazzo@ufsc.br

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received September 2, 2017; final manuscript received May 25, 2018; published online June 26, 2018. Assoc. Editor: Gerardo Diaz.

J. Sol. Energy Eng 140(6), 061004 (Jun 26, 2018) (9 pages) Paper No: SOL-17-1363; doi: 10.1115/1.4040534 History: Received September 02, 2017; Revised May 25, 2018

In this work, the exergy analysis of two configurations of hybrid solar–sugarcane cogeneration power plant is proposed in order to evaluate the overall efficiency enhancement of the cycle. Solar thermal energy was coupled to a sugarcane cogeneration power plant localized on the tropical region of Brazil, in order to preheat the feeding water supplied to the steam generators and to reduce the fuel consumption during the sugarcane-harvesting season in order to stock the unused fuel for its use during the off-season. The exergy analysis of the cycle was proposed based on a thermodynamic model, which considered real operational states, and allowed to quantify the main parameters of performance, such as the solar-to-electricity (STE) efficiency, the power generation increasing, the percentage of fuel saved, and the exergy destruction rates of the equipment. The results showed that, under design conditions, almost 10% of fuel was saved, and the overall exergy destruction decreased 11% approximately. Additionally, as a result of the hourly analysis of the annual operation, it was found that the power plant operated 331 extra hours, 8.50 GWh of electricity were generated, and due to this fact, it has attained economic benefits for the operation of the sugarcane cogeneration power plant.

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Fig. 2

Operational scheme of the plant: (a) conventional power plant and (b) hybrid power plant

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Fig. 1

Sugarcane cogeneration cycle

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Fig. 3

Solar field integration: (a) configuration A and (b) configuration B

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Fig. 5

DNI versus exergy destruction: (a) configuration A and (b) configuration B

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Fig. 6

DNI versusηSTE: (a) configuration A and (b) configuration b

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Fig. 4

Fuel saved per month: (a) configuration A and (b) configuration B

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Fig. 7

DNI versus fuel consumption: (a) configuration A and (b) configuration B



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