The air cooler is a device that uses air as a cooling medium to cool the high temperature flue gas to the desired temperature. Since 1930s, air cooler has been widely used in large petrochemical enterprises after many improvements. In recent years, due to the promotion of new dry cement production line, air cooler also began to be applied in the cement industry, and achieved good economic benefits. The powder in high-temperature flue gas has different physical properties between at dry-process cement kiln head and kiln tail, thus kiln head and tail adopt different cooling meatures. The powder in kiln head flue gas has larger particle size, small viscosity, so air cooler is used more. However, due to the viscosity and concentration of the dust contained in the kiln tail flue gas are big, it is easy to cause the heat transfer tube to be clogged, therefore, there is a general use of humidifying tower.

But the humidifying tower has the following disadvantages:

1) the tower takes too much space and is too high, so it is difficult to operate and maintain.

2) the consumption of water resources is too large, the spraying is too frequent, the automation is low, the nozzle is easy to plug and difficult to clean.

3) low reliability, easy to happen wet bottom, affect the process production.

In view of the above shortcomings, it is urgent to use the air cooler to cool down the flue gas at the kiln end. This paper mainly discusses and introduces the application of kiln air cooler in cement industry.