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Experimental investigation on the air excess and air displacement influence on early stage and complete combustion gaseous emissions of a small scale fixed bed biomass boiler

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  • Caposciutti, Gianluca
  • Barontini, Federica
  • Antonelli, Marco
  • Tognotti, Leonardo
  • Desideri, Umberto

Abstract

The world energy demand growth is more and more supplied by renewable energy sources. In this scenario, biomass has a key role in both heat and power generation. Particularly, biomass combustion can be used in small size micro and distributed generation systems, or in smart grids together with wind and solar energy where a programmable energy source is necessary to keep the electric grid stable. In this paper, a small size 140 kWth biomass fixed bed boiler of the University of Pisa, located at the Biomass to Energy Inter-University Research Centre (CRIBE), was studied experimentally to characterize the biomass combustion process. Emissions of NOx, O2, CO2 and CO, together with the temperature data, were measured in the flue gases. Moreover, the spatial distribution of volatile products from the fixed bed surface, such as H2, CO, CO2, CH4, C2H6, C2H4, C2H2, together with temperature data, was studied in the early combustion stage. The parametric variation of the feed air flow and its effect on the emissions and performances was also investigated. The results indicate that the primary air mainly affects the volatiles distribution on the biomass combustion surface. Therefore, the CO emission was minimized at values of 0.03%vol with an air excess equal to 2 and a 0.06 secondary to primary air mass flow ratio.

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  • Caposciutti, Gianluca & Barontini, Federica & Antonelli, Marco & Tognotti, Leonardo & Desideri, Umberto, 2018. "Experimental investigation on the air excess and air displacement influence on early stage and complete combustion gaseous emissions of a small scale fixed bed biomass boiler," Applied Energy, Elsevier, vol. 216(C), pages 576-587.
    • Handle: RePEc:eee:appene:v:216:y:2018:i:c:p:576-587
    DOI: 10.1016/j.apenergy.2018.02.125
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    1. Caposciutti, Gianluca & Barontini, Federica & Galletti, Chiara & Antonelli, Marco & Tognotti, Leonardo & Desideri, Umberto, 2020. "Woodchip size effect on combustion temperatures and volatiles in a small-scale fixed bed biomass boiler," Renewable Energy, Elsevier, vol. 151(C), pages 161-174.
    2. Zadravec, Tomas & Rajh, Boštjan & Kokalj, Filip & Samec, Niko, 2021. "Influence of air staging strategies on flue gas sensible heat losses and gaseous emissions of a wood pellet boiler: An experimental study," Renewable Energy, Elsevier, vol. 178(C), pages 532-548.
    3. Eo, Jae Won & Kim, Min Jun & Jeong, In Seon & Cho, LaHoon & Kim, Seok Jun & Park, Sunyong & Kim, Dae Hyun, 2021. "Enhancing thermal efficiency of wood pellet boilers by improving inlet air characteristics," Energy, Elsevier, vol. 228(C).
    4. Böhler, Lukas & Fallmann, Markus & Görtler, Gregor & Krail, Jürgen & Schittl, Florian & Kozek, Martin, 2021. "Emission limited model predictive control of a small-scale biomass furnace," Applied Energy, Elsevier, vol. 285(C).
    5. Böhler, Lukas & Görtler, Gregor & Krail, Jürgen & Kozek, Martin, 2019. "Carbon monoxide emission models for small-scale biomass combustion of wooden pellets," Applied Energy, Elsevier, vol. 254(C).
    6. Cavalli, A. & Kunze, M. & Aravind, P.V., 2018. "Cross-influence of toluene as tar model compound and HCl on Solid Oxide Fuel Cell anodes in Integrated Biomass Gasifier SOFC Systems," Applied Energy, Elsevier, vol. 231(C), pages 1-11.
    7. Bartosz Ciupek & Karol Gołoś & Radosław Jankowski & Zbigniew Nadolny, 2021. "Effect of Hard Coal Combustion in Water Steam Environment on Chemical Composition of Exhaust Gases," Energies, MDPI, vol. 14(20), pages 1-24, October.
    8. Böhler, Lukas & Krail, Jürgen & Görtler, Gregor & Kozek, Martin, 2020. "Fuzzy model predictive control for small-scale biomass combustion furnaces," Applied Energy, Elsevier, vol. 276(C).

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