In view of the waste disposal problems faced by urban green development

by using the advantages of coal-fired power plants

the pre drying and carbonization technology of urban waste is developed to realize the resource and harmless disposal of urban wastes by coal-fired power plants. The high-temperature flue gas of pulverized coal boiler is extracted for integrated disposal of wastes in the integrated processor. All component products are transported to the high-temperature furnace for incineration through closed pipelines. The atmospheric pollutants generated by incineration are effectively removed by the environmental protection facilities at the tail of the boiler to achieve ultra-low emission. The formation of dioxins in the process of waste incineration is restrained at 1 300 ℃～1 500 ℃. The conversion efficiency of waste chemical energy to electric energy is increased to 37%～42%. Small-scale industrial application of this technology has been acomplished in a sludge coupled power generation project. The result shows that

the sludge disposal capacity is up to 100 t/d. There is no odor and organic odor water produced in the whole disposal process. During the sludge disposal

the operation parameters of the main and auxiliary devices of the boiler are normal. The boiler efficiency decreases by about 0.05 percentage point after mixing sludge. There is no significant difference in concentrations between dioxins in flue gas at chimney inlet and heavy metals in fly ash.