Performance improvement of municipal solid waste drying in RDF production process

The drying characteristics of municipal solid waste were experimentally examined. A mixture of pulp (water soluble pulp), plastic (polyvinyl chloride powder), protein (soybean protein powder) and water was used as the model refuse. The operational conditions were varied and the changes in weight and temperature with time were measured. The hard layer is formed on the drying side of the sample due to protein denaturation. With increasing CaO content, this hard layer becomes thinner and more cracks are generated. As a result, when the temperature of drying gas is relatively high, the drying rate is higher in the case with CaO than in the case without CaO. It is found that the uniform addition of CaO to the refuse and CO₂ in the drying gas enhance the drying rate in the RDF production