Energy and exergy diagnostics of an industrial annular shaft limekiln working with producer gas as renewable biofuel Original scientific paper
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Abstract
Quicklime, a globally significant commodity used in various industrial applications, is produced in limekilns requiring substantial energy, traditionally, from fossil fuels. However, due to escalating emission constraints and depletion of fossil fuel deposits, the quicklime industry explores alternative fuels, like biomass. The literature lacks feasibility diagnostic studies on limekilns using alternative biomass fuels. Thus, this article aims to conduct energy and exergy diagnostics on an industrial limekiln using producer gas derived from eucalyptus wood as renewable biofuel. Employing industrial data and thermodynamics principles, the equipment was characterized, and results were compared with literature findings for similar limekilns using fossil fuels. The Specific Energy Consumption for the producer gas-operated limekiln was 4.8 GJ/tquicklime, with energy and exergy efficiencies of 54.6% and 42.2%. Overall energy and exergy efficiencies were 42.0 % and 23.6%, respectively, lower than literature values. was 7.6 GJ/tquicklime, higher than literature results. Identified enhancements for both renewable and fossil fuel-powered limekilns involve recovering energy and exergy, including heat recovery from exhaust gases, minimizing thermal losses, and optimizing operational variables. These findings offer valuable insights for researchers exploring renewable biofuel adoption, like producer gas derived from eucalyptus wood, as alternatives to conventional fossil fuels in limekilns.
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Funding data
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Grant numbers 001 -
Conselho Nacional de Desenvolvimento Científico e Tecnológico
Grant numbers 312248/2022-9
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