date：2019-07-26 16:32:16 views：955
Pollution and prevention of atmospheric environment in rotary kilns have always been an important problem in the production process of rotary kilns. Smoke and dust pollution is easy to attract attention because of intuition, but the pollution caused by harmful gases such as sulfur dioxide is often ignored. During the drying process of materials, flue gas will be generated. High temperature flue gas will exchange heat with materials in the dryer barrel. Material accepts heat, and its temperature rises. Then water will evaporate, while the flue gas will gradually cool down, and eventually it will be discharged from the tail of the lime rotary kiln. After discharging, it will be recovered or straightened by the dedusting device. It is then discharged into the atmosphere.
Rotary kiln
The dust content in flue gas varies according to the type, characteristics and drying degree of materials. The presence of SO2 in flue gas, coupled with wet environment, will cause corrosion to equipment and filter materials. SO2 mainly comes from burning coal with high sulfur content. Because the flue gas contains harmful air components, it is better to add a dust removal device at the end of the lime rotary kiln to avoid directly discharging the flue gas into the air and reduce air pollution.
The moisture content of drying materials is large and fluctuates between 5% and 20%. The moisture content of flue gas is high. The dew point is as high as 60 - 70 C. It is easy to produce condensation in pipelines and dust collectors, which causes paste bags. High temperature and wide fluctuation range. Generally, even if the moisture content of the material is high, the tail temperature is 120 C enough to dry the material, but in practice, there will be material breakage. Once it occurs and found that it is not timely, the flue gas temperature will rapidly rise to more than 200 C. When the moisture content of the material is low, the tail temperature can also be dried normally at 60 ~80 ~C.
