What are the Advantages of a Preheater in a Wet-Method Converter?
What are the Advantages of a Preheater in a Wet-Method Converter?
1. The material is suspended in the hot gas flow, and fully exposed to the gas flow. The area of contact is large, which is 3000-4000 times larger than the accumulated state in the converter. The increase in the area of contact is the fundamental reason for improving the heat transfer, mass exchange, and chemical reaction rates between the gas and solid phases.
2. The coefficient of heat transfer is large. The suspended preheater is a gas-solid inverse-flow heat exchanger consisting of multiple preheating units that are serially connected. When the powder reaches the heat transfer pipe, it is scattered by the impact of the scatterer and further scattered by the rising airflow. Subsequently, it is accelerated by the airflow and enters the stage of equal flow. During the acceleration stage, the relative movement velocity of the gas and solid is often greater than in the converter. The flow degree is high, and the boundary layer is thin. In addition, because the temperature difference between the gas and solid is large, the coefficient of heat transfer is also large.
3. The coefficient of heat transfer is high. In each heat transfer unit of the preheater, the solid particles and the gas flow are mixed at a moment when the temperature difference between the gas and solid is large, and the coefficient of heat transfer is also high.
The equipment of the converter preheater described above is the introduction of its characteristics. I believe that after reading the above description, everyone will have a certain understanding of the preheater. This will also be of great help to everyone.