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Energies 2013, 6(12), 6170-6187; doi:10.3390/en6126170

Co-Combustion of Animal Waste in a Commercial Waste-to-Energy BFB Boiler

1,* , 1
1 School of Engineering, University of Borås, Allégatan 1, 50190 Borås, Sweden 2 Scandinavian Energy Project AB, Rullagergatan 4, 41526 Göteborg, Sweden
* Author to whom correspondence should be addressed.
Received: 26 September 2013 / Revised: 16 November 2013 / Accepted: 21 November 2013 / Published: 27 November 2013
(This article belongs to the Special Issue Biomass and Biofuels 2013)
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Co-combustion of animal waste, in waste-to-energy boilers, is considered a method to produce both heat and power and to dispose of possibly infected animal wastes. This research conducted full-scale combustion tests to identify the impact of changed fuel composition on a fluidized-bed boiler. The impact was characterized by analyzing the deposit formation rate, deposit composition, ash composition, and emissions. Two combustion tests, denoted the reference case and animal waste case, were performed based on different fuel mixes. In the reference case, a normal solid waste fuel mix was combusted in the boiler, containing sorted industry and household waste. In the animal waste case, 20 wt% animal waste was added to the reference fuel mix. The collected samples, comprising sampling probe deposits, fuel mixes, bed ash, return sand, boiler ash, cyclone ash and filter ash, were analyzed using chemical fractionation, SEM-EDX and XRD. The results indicate decreased deposit formation due to animal waste co-combustion. SEM-EDX and chemical fractionation identified higher concentrations of P, Ca, S, and Cl in the bed materials in the animal waste case. Moreover, the risk of bed agglomeration was lower in the animal waste case and also a decreased rate of NOx and SO2 emissions were observed.
Keywords: bubbling fluidized bed (BFB) boiler; animal waste; MSW; deposit; ash bubbling fluidized bed (BFB) boiler; animal waste; MSW; deposit; ash
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Moradian, F.; Pettersson, A.; Svärd, S.H.; Richards, T. Co-Combustion of Animal Waste in a Commercial Waste-to-Energy BFB Boiler. Energies 2013, 6, 6170-6187.

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