Thermal Analysis Of Refuse-Derived Fuel (RDF) Made Of Residual Waste And Biomass

The huge amount of municipal solid waste (MSW) increases rapidly with the developing urbanization process, while a large number of rural agricultural waste has not been used effectively, resulting in waste of resources. Refuse-derived fuel (RDF) made from high calorific waste and biomass is considered a preferential solution to maximize the recovery of energy due to its high density, high efficient combustion, and low secondary pollution. In this thesis, RDF's preparation method, incineration, pollutants emission are studied in details.Based on experience of MSW source separation in Shenyang, the informations of the MSW component are obtained. The combustion process of RDF was investigated by means of thermogravity-differential temperature analyser (TG-DTA). The combustion process of RDF consists of four phases: drying, releasing of volatiles, burning of polymers and burning of fixed carbon. With increasing heating rate, the maximum rate of sample mass loss equaled. With the gradual increase of the oxygen concentration, the process state changed from pyrolysis to combustion, the maximum rate of sample mass loss increased.A number of lab-scale RDF incineration experiments were carried out to investigate the combustion characteristics, pollutants emission and the characteristics of ash formation. The results show that the RDF combustion process can be shown indirectly through the CO emissions; NOx, SOx emission is mainly coming from N, S of raw material. With the biomass in RDF content increases, the amount of chlorine precipitation decreased; the amount of chlorine precipitation maximum at 800℃; the RDF tendency of slagging and fouling is serious. The economic and technical feasibility analysis of RDF thermal utilization was given.