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Combustion tests have been carried out in a fluidised bed boiler to investigate the fate of trace elements during co-combustion of wood and municipal sewage sludge. The approach was to collect fuel and ash samples and to perform thermodynamic equilibrium calculations for gasification (reducing) and combustion (oxidising) conditions. Trace elements are found in the ash. Even most of the highly volatile...
Interference from phosphorus on sulphur capture during co-firing of sludge with wood has been investigated in a circulating fluidised bed boiler. Chemical equilibrium analyses were performed on the combustion system to complement the experimental results. It was found that the relatively high content of phosphorus in municipal sewage sludge interferes with the sulphur capture by occupying calcium,...
Potassium together with chlorine is the principal species that causes undesirable deposits and eventually corrosion on heat exchanger tubes in boilers fired with bio and waste fuels. It is shown here by tests in a circulating fluidized bed boiler that co-combustion of biomass with another fuel, in this case municipal sewage sludge, can remove or considerably reduce such deposits at the same time as...
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