Study On The Combustion And Ash Fusion Characteristics Of Kitchen Waste For Degreased

With the rapid development of the catering industry, the production of kitchen waste increased quickly. The "illegal cooking oil" events aroused the widespread concern in the research area of using the kitchen waste as resources in a harmless way. According to the high moisture and high organic content of the kitchen waste, bio-diesel, which has attracted much attention in recent years, transformed form kitchen waste had more effective utilization. Kitchen waste treated with crushing, cooking and the water-oil separation treatment, which is used for bio-diesel and the recycling of solid waste was called degreased kitchen waste. Thermal treatment to the degreased kitchen waste is not only in harmless and resourceful treatment of kitchen waste but also quickly recover energy of the processing technic. Therefore, this paper focused on the degreased kitchen waste thermal treatment of theoretical and experimental studying, to lay a theoretical foundation for the development of degreased kitchen waste combustion technology which has a very important academic significance and application value.In this paper, degreased kitchen waste as the research object, the combustion characteristics and ash fusion characteristics of degreased kitchen waste were studied. First, the compositions of degreased food waste were studied. Second, the characteristics of ignition and burnout, general combustion performance and its kinetic parameters of combustion of degreased kitchen waste were studied by using thermogravimetric analysis. The specific surface area analysis and functional analysis were studied by using specific surface area analyzer and infrared spectrometer. Finally, ash fusion characteristics of kitchen waste for degreased was studied by using ash melting analyzer, and different morphologies, form of Cl, K, Na and other elements exist in the ash was studied by using XRD diffraction analyzer, SEM/EDX analyzers.Studies have shown that ignition and burnout characteristics of degreased food waste are good, but its general combustion characteristic is not perfect. Improve the heating rate and oxygen concentration can improve the general combustion characteristics. As the lengthen of burning time, the specific surface area has experienced the first increasing and then reducing. The deformation temperature of high temperature ash is higher than low temperature ash, softening temperature, hemispherical temperature and flow temperature have little change. When the temperature is higher than 900℃, Cl, K, Na element has large part of the precipitated compound in gaseous form. When the temperature has reached 1200℃, Cl precipitate all, contain small amounts of K, Na in the ash.