PAPER MILL COGENERATION POWER PLANT ASSISTED
BY LINEAR FRESNEL SOLAR COLLECTORS
ARTIGO TÉCNICO / TECHNICAL ARTICLE
O PAPEL vol. 79, num. 5, pp. 86 - 89 MAY 2018
Authors: Eduardo Burin1, Pedro Lo Giudice2, Edson Bazzo3
1. University of Parana (UFPR), Department of Engineering and Exact Sciences (DEE), Brazil
2. TGM Turbines, Brazil.
3. University of Santa Catarina (UFSC), Lab. of Combustion and Thermal Systems Engineering (LabCET). Brazil
ABSTRACT
The objective of this work is to evaluate the integration of a
linear Fresnel field in a feedwater heating scheme with a paper
mill cogeneration plant to provide additional electricity generation.
The plant in question is located in Mato Grosso do Sul state and
is equipped with a cogeneration cycle that uses a regenerative
feedwater heating system. The steam generator has a 600 t/h capacity
and provides steam at 91 bar / 490 °C. Main steam is expanded in
a backpressure and a condensing steam turbine. Solar integration is
evaluated to displace the high-pressure steam extraction (34 bar)
by preheating feedwater at 120 bar from 150 to 200°C at design
point. The otherwise extracted steam is expanded in the condensing
turbine providing power boost. Simulations were performed using
EES software for a typical meteorological year. 11,955 MWh additional
electricity was observed after hybridization (+1.7% when compared to
the base case operation) at LCOE ranging from 160 to 215 US$/MWh
depending on solar field investment. The solar-to-electricity efficiency
was equal to 13%. This work demonstrated the gains due to
integration of solar concentrators with a paper cogeneration plant,
representing an opportunity to increase the capacity of these units to
export additional power to the grid.
Keywords: Biomass; paper mill; cogeneration; solar energy;
linear Fresnel.