With the development of technology of cement clinker，new dry method cement production process has been making heat consumption of unit cement clinker greatly reduced,but the low-temperature heat exhaust emissions from kiln clinker cooler (AQC) and kiln preheater (SP) accounted for more than 30% of the total consumption of cement clinker burning calories,therefore recoveing the waste heat to further reduce heat consumption in cement production is essential.In a cement company's existing three 1 000 t/d rotary kiln production line,under full production conditions, the kiln head produced the flue gas with the average temperature of 380 ℃, flow rate of 1.395×105 m3/h, the kiln tail produced flue gas with the average temperature of 330 ℃, flow rate of 2.76 ×105  m3/h. According to this company heat sources conditions and by calcalating, the identified installed program was one single pressure condensing steam turbine generator units with rated capacity of 5 MW, three single-pressure AQC waste heat boiler and three single-pressure SP waste heat boiler.