Aiming at solving the difficult problems in urban sludge disposal in China

the sludge drying technology and quality index of drying sludge are analyzed. Three main sludge blending processes for coal-fired power generation plants are introduced

including direct blending sludge process

blending sludge dried directly by flue gas and in-directly by steam. It is considered that blending sludge in coal-fired power plant is an efficient approach for sludge volume reduction

stabilization

harmlessness and resource utilization. The selection of blending sludge process for coal-fired power plants should consider the specific sludge blending amount

blending requirements and unit matching. As long as the blending proportion of sludge is controlled at a reasonable level(within 10%)

the coal-fired unit can be operated with mixed sludge

and the boiler runs stably

the quality of fly ash slag changes little

and the discharge of pollutants and heavy metals reaches the standard.