Modelling and experimental investigation of small-scale gasification CHP units for enhancing the use of local biowaste
Date
2021-10-21
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Publisher
Elsevier
Abstract
Small-scale gasification Combined Heat and Power systems, fed by biowaste resources, have the potential to
enhance local renewable energy production, reduce carbon emissions and address the challenges of waste
disposal. However, there is a lack of understanding on the influence of challenging feedstocks, such as, for
example, digestate, poultry litter and municipal solid waste, on the syngas quality and the incidence of the drying
stage in the overall process. This paper addresses this gap by analysing and comparing 40 samples of the most
common biowaste feedstocks. We developed a stoichiometric-thermodynamic one stage equilibrium model that
was experimentally validated and calibrated by laboratory results, with a maximum error of 15% between real
and predicted values. Simulation results show that the low heating value of the syngas produced from biowaste
resources analysed ranges from 3.1 to 5.4 MJ/Nm3 on a dry basis. Working at the optimal equivalence ratio
increases the electricity and thermal output by up to 20%. To achieve a feedstock moisture content of 10%, the
drying process may require up to 60% of the heat produced. Furthermore, results show that downdraft gasification
based combined heat and power, is a feasible and interesting option to deal with biowaste resources which
can potentially avoid the cost, risk and externalities of landfilling while it contributes to the increase of local
electricity and heat production from renewable energy sources, both for grid and off-grid applications.
Description
Publication history: Accepted - 10 October 2021; Published online - 21 October 2021.
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Keywords
Biowaste, Energy from waste, Gasification, Synthesis gas, Combined heat and power production
Citation
de Priall, O., Gogulancea, V., Brandoni, C., Hewitt, N., Johnston, C., Onofrei, G. and Huang, Y. (2021) ‘Modelling and experimental investigation of small-scale gasification CHP units for enhancing the use of local biowaste’, Waste Management. Elsevier. doi:10.1016/j.wasman.2021.10.012.