Numerical simulation and structure optimization of sintering hot air circulating hood
CHEN Si-mo1, ZHOU Hao-yu1,2, ZHU Rong-jia1, LI Qian1,3, LIU Qian1, WANG Ye-feng1
1. National Engineering Research Center of Sintering and Pelletizing Equipment System, Zhongye Changtian International Engingeering Co.,Ltd., Changsha 410205, Hunan, China; 2. School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, Hunan, China; 3. College of Energy Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China
Abstract：To solve the problem of uneven hot air distribution and backflow in the hood, the hot air circulating hood of 500 m2 sintering machine hot air circulation system in Shougang Jingtang was analyzed and optimized using the computational fluid dynamics method. The numerical simulation results of original hood showed that entering hot air into the hood from the horizontal direction leant towards to the far side while a low-speed backflow zone occurred in the other side. Consequently, it led to serious uneven distribution of hot air in the hood with a maximum velocity of 6.36 m/s at the material surface and the velocity distribution variance was 3.27. In terms of original hood defect, the structure features of air intake, deflector and rectifier flower plate were studied. An optimal scheme of improvement in view of those defects was proposed. The originally square air intake was improved into a square diffuser. A horizontal deflector was coupled with the originally vertical deflector to lower the flow resistance with a new rectifier flower plate and deflectors were added. The simulation results of improved structure showed that the maximum velocity of hot air at the material surface was 2.82 m/s, with the variance of 0.30, which were reduced by 55.7% and 90.8%, respectively, compared with the original ones. After the optimization, the hot air was much more perpendicular to the material surface, eliminating its uneven distribution and backflow, and making it possible for the coupling use of hot air or flue gas circulation system and gas injection system for the sintering machine.
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2022, Vol. 32 
