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VOL. 10, ISSUE 1 (2024)
Exergy analysis of a fluidized bed combustor
Authors
Orah A M, Abolusoro P Olatunji, Yekeen N A, Akabuike E E, Yusuf S Adedeji
Abstract
The ecological concerns relating to greenhouse
gases (GHG) have necessitated the quest for the greenisation of energy
production and utilisation. Fluidised bed combustion is a vital technology for
greener and cleaner combustion of fossil and biomass fuels because of its
capability to technically and economically match conventional energy
technologies. It offers many superior features, especially regarding emissions
and fuel flexibility, making it a suitable technology for different physical
and chemical processes. This study presents the exergy analysis based on the
second law of thermodynamics for an experimental fluidised bed combustor (FBC)
rig. The system comprises two zones: the bed and the freeboard. The exergy
analyses were carried out for the two zones, considering the system utilising
groundnut shell (GS) as the biomass fuel. The chemical exergy from the fuel was
obtained as 1997.27 kJ/kg with a heat transfer rate of 5410.50 kW. Between the
two zones, the variance in the exergy storage rates, exergy destruction and
entropy generation were 11%, 29% and 29%, respectively. The results also
indicated that the highest amount of exergy destruction occurred in the bed
region of the FBC system, with 695.84 kW, compared to the freeboard region,
with 502.43 kW. The higher exergy destruction in the bed results in the most
significant exergy losses over the freeboard since the bed constitutes the
heart of the combustor. The higher exergy in the bed is attributable to the
combustion (chemical reaction), heat transfer across significant temperature
differences and thermal losses in the flow paths.
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Pages:1-5
How to cite this article:
Orah A M, Abolusoro P Olatunji, Yekeen N A, Akabuike E E, Yusuf S Adedeji "Exergy analysis of a fluidized bed combustor". International Journal of Research in Advanced Engineering and Technology, Vol 10, Issue 1, 2024, Pages 1-5
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