RDF Pyrolysis Mechanism Model And Gasification Characteristics Simulation

With the improvement of living standards, a large amount of wastes can not be processed in time efficiently, the city is surrounded by wastes, which cause odorous smell, soil and underground water pollution. And as the increasing of heat value, the waste is ready for resource and energy use. Without waste classification mechanism, the particle size and heat value is very uneven, which is unfavorable for the effective use of garbage, furthermore, causes combustion deterioration and generates dioxins and other organic pollutants. As the requirement of environmental protection increasing, waste gasification technology becomes research hotspot. In order to improve the incineration condition, the refuse derived fuel with the stable heat value and particle size has caused more and more attention.RDF is a potential fuel, in order to fully understand its physical and chemical characteristics, this paper comparatively studied the pyrolysis and combustion behaviors in argon and air atmosphere of three different RDFs, one from the USA (USA-RDF) and two from China (ZJ-RDF and SD-RDF), through TG (Thermogravimetry), DTG (Differential Thermogravimetry) and DSC (Differential Scanning Calorimetry) thermal analysis, the ignition temperatures, burnout temperatures, as well as comprehensive combustion characteristics index were deduced to characterize their combustion features. From the pyrolysis behavior of three RDFs, it can be seen that USA-RDF is a more ideal fuel, which indicates the effect of waste classification.Aspen plus is used to simulate the RDFs gasification, the effects of excess air efficiency (a) on gasification temperature and CGE, and compared with the ordinary waste.Dioxin emission is one of the hotspot of researchers. This paper studied the dioxin emissions of three different RDFs under pyrolysis and combustion conditions. The results indicate that, pyrolysis condition can reduce the emissions of dioxins and other organic pollutants. The dioxin released has a positive correlation with the chlorine content of original RDF.