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COMPARATIVE EVALUATION OF SRF AND RDF CO-COMBUSTION WITH COAL IN A FLUIDISED BED COMBUSTOR

Increasing fossil fuel prices and greenhouse gas (GHG) reduction requirements compels energy users to utilise cost effective materials that also have a significant biomass fraction. The biomass fraction is considered ‘carbon neutral’ and does not contribute towards GHG emissions. The UK, like many Member States, is facing challenging landfill diversion targets for BMW (biodegradable municipal waste) to fulfil the Landfill Directive (Council Directive, 1999) requirements (Garg et al., 2007). According to the latest data, the UK landfilled ca. 62% of total MSW in 2005-06 (Defra, 2006).

by Anurag Garg, Richard Smith, Dr Phil Longhurst, Prof. Simon Pollard, Dr Nigel Simms

The experimental study reported here was carried out to assess the feasibility of municipal solid waste (MSW) derived solid recovered fuel (SRF) in energy recovery applications. SRF was prepared by grinding and blending the major MSW constituents such as paper, plastics, wood and textile. The percentage of various constituents was the same as from the Ecodeco process employing bio-drying followed by mechanical treatment. The heating value of synthetic SRF was ca. 21 MJ/kg (as received basis). The metal emission results from the SRF co-combustion with coal were compared with that obtained from coal mono-combustion and refuse derived fuel (RDF) co-combustion with coal. RDF was also derived from MSW and was obtained from a local mechanical treatment waste facility. Use of SRF as co-fuel does not increase the emissions of metals to the environment in the flue gas stream when compared to coal mono-combustion. In addition, use of MSW derived fuel reduces the arsenic release to the atmosphere. The results showed that most of the metals are retained in the ash components (except mercury). The mobility of metals depends on the volatility and type of feedstock.

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published: IWWG International Waste Working Group, Specialized Session E (Oktober 2007), 10|2007
Keywords: Controlling, Environmental Policy, Mechanical Biological Treatment, Plastics, Raw Materials, Scrap Wood, Waste Paper, Cardboard, Paperboard, Waste-fuelled Power Station, Waste-to-Energy Plant
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