With the rapid development of technology and equipment in China's cement industry, 25 million t/d, 5,000t/d, 6,000t/d and10,000t/d new dry cement clinker production lines (cement kilns for short) have been put into operation one after another. Meanwhile, The comprehensive energy consumption of cement production is also greatly reduced: the heat consumption is 30 10 kJ per kilogram of clinker. For the new dry cement clinker production line of the above scale, the waste gas heat discharged from the preheater can be recycled for power generation (excluding the dry raw fuel heat in the cement production process, but the waste gas heat is recycled) and cooled down by the kiln head clinker tail and kiln, and its proportion in the total heat consumption of cement clinker is also reduced to 22% ~ 27%. However, due to the expansion of the cement kiln scale, the waste gas residual heat discharged by the clinker cooler at the kiln head and the preheater at the kiln tail is still very large. Take the 5000 t/d cement clinker production line as an example:

Exhaust gas from kiln head clinker cooler: about 310000 nm3/h 200&; # 8764; 250 ~C, the heat of exhaust gas discharged is about 3.059 t/h; Exhaust gas from preheater at kiln end: about 320000 Nm3/h 300 & amp； # 8764; At 350℃, after deducting the waste gas heat of about 200℃ required by the drying process of raw fuel in cement production, the heat of discharged waste gas is about 2.318 t/h. According to the temperature, the heat discharged by the above two parts has a power generation capacity of about 8827 kW theoretically, which consumes 40 ~ 43% of the total power consumption of cement children. Therefore, the construction of waste heat power station and the development of pure low-temperature power generation technology with waste heat from cement kiln by cement production enterprises are in line with the direction of comprehensive energy utilization and construction saving encouraged by the state.