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| Influence and majorization of arrangement of agitator on flow of anoxic pool |
| CHEN Yunfan1, ZHOU Yongsheng2, ZHANG Hua2,3*, YANG Chen2, WANG Yuan3, XU Yunfeng4 |
| 1. College of Oceanography, Hohai University, Nanjing, Jiangsu 210098, China; 2. Research Institute of Chemical Machinery, Hefei University of Technology, Hefei, Anhui 230002, China; 3. Research Institute of Nanjing Hegong Intelligent Environmental Protection Co. Ltd., Nanjing, Jiangsu 211500, China;4. Lanshen Co. Ltd., Nanjing, Jiangsu 211500, China |
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Abstract Aiming at the problem that the mixing effect of the mixed liquor in an anoxic tank is related to the design of the equipment and affected by the arrangement of the mixer, the influence of arrangement of agitator on the flow field of anoxic pool was studied. Based on the star-ccm + virtual simulation platform, the anoxic pool and the agitator area were divided into polyhedral grids, and the K-Epsilon turbulence model was used to conduct the full flow field numerical simulation and analyze the physical structure of the flow field in the pool. According to the circulation layout formed by agitator, the two layout modes were designed, namely, the overall push flow and the distributed push flow, so as to obtain the optimal placement angle and position. The results show that the anoxic pool can effectively reduce the area of low speed area and increase the average stirring speed by adopting the whole pushing flow. When two agitators are placed at a certain angle to the wall surface, the diffusion of pushing flow and the improvement of dead corner area are more favorable. According to the optimization results, the experimental results are close to the numerical simulation. Therefore, the polyhedral mesh calculation is adopted, which has a good convergence rate and calculation accuracy, providing a reference for the layout of agitators in the flow field of biochemical pool.
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Received: 25 July 2019
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