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Fluidised bed combustion and ash fusibility behaviour of coal and spent coffee grounds blends: CO and NOx emissions, combustion performance and agglomeration tendency

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Año de publicación 2022
Idioma Inglés
Publicado por Fuel Journal

Descripción: Abstract: The co-combustion of coal and waste biomass is an advantageous option for combined waste biomass disposal and energy production. However, co-firing coal with waste biomass has to overcome various ash-related operational problems, for example, ash agglomeration and bed defluidisation in fluidised bed boilers. Using spent coffee grounds (SCG) for energy generation via co-combustion is much more sustainable and environmentally friendly than SCG disposal in landfills. The research done so far on the co-combustion of coal and SCG is quite scarce and almost non-existing. Further research is needed to understand how the properties of SCG affect the co-combustion of coal and SCG in existing coal-fired boilers. This study investigates the combustion of a bituminous coal blended with SCG in a pilot-scale (30kWth) bubbling fluidised bed (BFB) combustor focusing on CO and NOx emissions, combustion performance, and agglomeration tendency. The BFB combustion tests were conducted at 900 ?C and atmospheric pressure using silica sand as the bed material. For comparison purposes, combustion tests of the same coal in pure and blended with wheat straw pellets at the same blending ratio were also performed. Further, ash fusibility studies were performed to elucidate the interactions between the coal ash and SCG ash, and the effect of ash compositions on the fusibility temperatures. Samples of the used bed material collected from the combustor and cyclone ash were characterised by SEM-EDS and XRF. The BFB combustion test results revealed that SCG could reduce the efficiency loss of coal combustion under co-combustion conditions. Despite the higher K2O content in SCG compared to wheat straw, a reduced agglomeration tendency was observed with the BFB combustion of the coal-SCG blends. The results from the characterisation of the used bed material, cyclone ash, and ash fusibility studies confirmed this finding, which was attributed to the formation of high melting temperatures Mg- and Ca-bearing compounds.
Citación recomendada (normas APA)
: Luis Eduardo; Mejía García Fernández, "Fluidised bed combustion and ash fusibility behaviour of coal and spent coffee grounds blends: CO and NOx emissions, combustion performance and agglomeration tendency", Colombia:Fuel Journal, 2022. Consultado en línea en la Biblioteca Digital de Bogotá (https://www.bibliotecadigitaldebogota.gov.co/resources/3711876/), el día 2025-05-16.

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- Tecnología
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Fuente Biblioteca Virtual Banco de la República
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Año de publicación 2022
Formato PDF
Cobertura Colombia

Fluidised bed combustion and ash fusibility behaviour of coal and spent coffee grounds blends: CO and NOx emissions, combustion performance and agglomeration tendency

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Fluidised bed combustion and ash fusibility behaviour of coal and spent coffee grounds blends: CO and NOx emissions, combustion performance and agglomeration tendency

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