The Ring Cooler Cooling Effect Numerical Analysis Of The Air Leakage Rate Test Method

Blasting ring cooler, which is mainly used in cooling sinter, is widely adopted in steel manufacturing industry because of its good properties such as high efficiency, compact structure and so on. Due to its severe working conditions, the seal rubber ring of ring cooler is easy to become soft and shed after long time work in high temperature condition. This defect will greatly reduce its efficiency, so that in different thicknesses of sinter, the rotation speed of ring cooler is hard to be adjusted. In the transformation and optimization of ring cooler, the air leakage ratio is an important index for the design department and quality technology department. So it is an urgent task to analyze the flow field and air leakage ratio of ring cooler.This thesis carries on a research on 396m2 blasting ring cooler, makes a numerical simulation for the internal flow field of the ring cooler in the thickness of 1000mm,1100mm,1200mm,1300mm,1400mm by using Gambit modeling software and Fluent fluid analysis software. Then we can get the cooling time and the air leakage rate of the ring cooler.The article first introduces the working principle of the ring cooler and the factors affecting the sinter cooling, then analyzes the main reasons for affecting the efficiency of the circular cooler; Then the thesis simplifies the circular cooler into two parts, establishes the Mathematical models for each two parts. The cooling of the sinter use porous medium model (porous media can simulate the internal structure of sinter). Followed using the Gambit software to establish the physical model and meshed, designates the type of boundary conditions, and then import the Fluent software for simulation. It simulates the air's temperature field and velocity field of sinter cooling. So we can obtain the cooling time of the heat sinter from 800℃to 150℃in different thickness from 1000mm -1400mm and the relationship between them. Indirectly, we can get the rotation speed of the ring cooler which can match the cooling time of sinter in different thickness. In addition, the article analyzes the air leakage rate of the ring cooler in different thickness of sinter. The study shows:Air leakage rate is related to the structure of leak location and the resistance characteristics of porous medium; The air leakage ratio is more servere with the increase of thickness; Through calculation, we get the maximum air leakage rate of ring cooler is 30.28%. Finally, the article explores the test method of 396m2 blasting ring cooler, the test date show the errors between the test results and simulated results are within 5.0%, it verifies the rationality and correctness of the results of numerical simulation.The research results will play an important instructing role in theory to the design and transformation of ring cooler, and provides a reliable seal data indicators to design department.