An air cooler is a device that uses air as a cooling medium to cool high temperature flue gas to the required temperature. After the appearance of air coolers in the 1930s, it has been widely used in large petrochemical enterprises after many improvements. In recent years, due to the promotion of new dry process cement production lines, air coolers have also been applied in the cement industry and achieved good economic benefits. The high-temperature flue gas of the new dry-process cement kiln head and the kiln tail is not the same due to the inconsistent physical properties of the dust contained. The kiln head smoke dust has a large particle size and a small viscosity, so the air cooler is used to cool down more. However, due to the viscosity and concentration of the dust contained in the kiln flue gas, it is easy to cause the heat exchanger tube to be clogged. Therefore, the industry generally does not use the air cooler to cool down and adopt the humidification tower spray method.

The characteristics of the kiln flue gas are: large amount of flue gas, high temperature, high concentration and corrosive components such as acid and alkali oxides. In addition, more than 60% of the dust particle size is less than 2.5 μm, so that the dust has a large viscosity. Flue gas can easily block the steel pipe after passing through the inside of the cooled steel pipe. In fact, when the cement dry normal line was just introduced into the country, the kiln tail gas treatment did try to cool the air cooler. At that time, the cooling pipe configuration of the air cooler was less than Φ60 mm. Shortly after being put into use, due to the nature of the kiln flue gas, the pipe was severely blocked, which affected the normal operation of the process. Therefore, whether the blockage of the cooling steel pipe can be solved determines the success or failure of the application of the kiln air cooler.