How to purify the polluted gases generated during the calcination process of an internal heating rotary kiln?
We all know that rotary kiln equipment inevitably produces harmful gases during the calcination of materials, causing certain environmental pollution. So how can we solve the air pollution caused by calcination? Is there a good solution that can improve the purification of polluted gases without affecting production. Strengthen the protection of the environment. This article provides a brief introduction to how to handle polluted gases:
The pollution and prevention of the atmospheric environment caused by internal heating rotary kilns have always been an important issue in the production process of internal heating rotary kilns Among them, smoke and dust pollution is intuitive and easy to pay attention to, but the pollution caused by harmful gases such as sulfur dioxide is often overlooked. During the drying process of materials, flue gas is generated. High temperature flue gas undergoes heat exchange with the material inside the dryer barrel. The material receives heat and its own temperature increases, causing the moisture to evaporate. The flue gas gradually cools down and is discharged from the tail of the double cylinder thermal rotary kiln. After discharge, it is recovered by the dust removal device or directly discharged into the atmosphere.
The dust content in the flue gas varies depending on the type, characteristics, and degree of drying of the material. Due to the presence of SO2 in the flue gas, coupled with a humid environment, it can cause corrosion to equipment and filter materials. SO2 mainly comes from burning coal with high sulfur content. Due to the presence of harmful air components in the flue gas, a dust removal device is added at the tail of the double tube internal thermal rotary kiln to avoid direct discharge of the flue gas into the air and reduce atmospheric pollution.
The moisture content of the drying material is high and fluctuates between 5% and 20%, resulting in a high moisture content in the corresponding flue gas. The dew point can reach as high as 60 ℃ -70 ℃, which is prone to condensation in the pipeline and dust collector, causing the bag to become sticky. High temperature, large fluctuation range. In general, even if the material has a high moisture content, it is sufficient to dry the material at a tail temperature of 120 ℃. However, in actual work, material breakage may occur. Once it occurs and is not detected in a timely manner, the flue gas temperature will quickly rise to over 200 ℃. When the material has low moisture content, it can also be dried normally at a tail temperature of 60 ℃ -80 ℃.