Characteristics Analysis of Blending Combustion Component of the Guangxi Urban Sludge

The research was the character of the urban sludge burning with coal by using the elemental anaylsis, component analysis, proximate analysis and thermogravimetric analysis. There is a big different elemental composition between the urban sludge and coal. For example, the carbon content (20.64%) in the sludge is only 31.3% of the coal. SiO2 in sludge incineration ash contain up to 15%, the same as SiO2 in Siliceous clinker. The sludge ash content (56.46%) is 2 times of in coal ash, anSubscript textd the volatile of sludge (34.6377%)is higher than the volatile of coal (25.089%), the sludge incineration can be divided into three stages: moisture volatilizing stage (30°C to 160°C), devolatilization combustion stage (160°C to 500°C) and fixed carbon and residual combustibles burning stage (510°C to 950°C). The heating rate increased, the volatiles volatilized advance about 50°C. Therefore, the sludge is a high value fuel, which can be used in the burning with coal or building materials.