Due to environmental concerns and depleting reserves of fossil fuels, alternative, environmentally friendly fuels such as biomass and waste products are being considered for partial or full fossil fuel replacement. A particular problem of waste materials such as sewage sludge is the low energy density and to deal with this several heat and power generation facilities are firing fuel mixtures, such as coal-biomass, coal-sewage sludge or even biomass-sewage sludge. These processes effectively ...
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