Energy recovery of used materials can be performed as mixed municipal solid waste (MSW) incineration or as fuel recovery for co-combustion with conventional fuels. Recovered fuels are refuse derived fuel (RDF) which is mechanically separated and processed from MSW, as well as packaging derived fuel (PDF) which is the source separated, processed, dry combustible part of MSW.A one year long co-combustion test of RDF with peat and coal has been carried out in a 65 MW CFB power plant in Kauttua, Finland. The efficiency of the combustion process and corrosion behaviour of the boiler were of particular interest in this study. Five different PDFs were also tested. A wide analytical programme was carried out including solid and gaseous emission measurements.The results are encouraging, showing that RDF and PDFs are technically and economically feasible and environmentally friendly fuels for co-combustion. Low CO emissions showed clean and efficient combustion. SO2 emissions decreased, because part of the coal was replaced by RDF and PDFs. HC1 emissions increased when the chlorine content of the fuel mixture increased. Heavy metals were concentrated to the fly ash in unleachable form. PCDD/F (dioxin) emissions were at the normal power plant level and far below the strictest incineration limit.Long-term co-combustion of 10% RDF did not cause any high temperature chlorine corrosion of the superheater (500°C) of the boiler. Soot blowing sequences did not change and no fouling was detected.The results show that it is useful, technically possible and environmentally friendly to combine resource and waste management in the form of fuel recovery for energy production in solid fuel fired power plants.
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- Fuel Recovery: Valorization of RDF and PDF
- Springer Netherlands