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《Proceedings of the Csee》 2001-09
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NUMERICAL STUDY ON THE EFFECT OF REVERSE SWIRL OF SECONDARY AIR ON FLUE GAS IMBALANCE IN LARGE TANGENTIALLY FIRED BOILER

LI Yan peng, ZHANG Qiang, GU Fan, XU Yi qian (Thermal Energy Research Institute, Southeast University, Nanjing 210096,China)  
This paper describes a three dimensional computer simulation developed to study the effects of the reverse swirl of secondary air on flue gas imbalance in tangentially fired boiler. The model was applied to a 600MW tangentially fired boiler under different operating conditions of reverse swirl of secondary air. The main characteristics of the current model are the use of the Porosity method to simulate the complex platen superheaters correctly, the improved non uniform QUICK scheme to reduce the pseudo diffusion effectively, and the standard k ε model for turbulence treatment. The numerical results agree well with the experimental data. Results show that flue gas imbalance results from the residual swirl at furnace exit. The reverse swirl of the secondary air can effectively weaken residual swirl at furnace and then decrease flue gas imbalance in horizontal gas pass to a certain extent. But the excessive reverse swirl air might deteriorate the flow field in furnace, and might increase flue gas imbalance. So it is necessary to optimize the momentum and the direction of reverse swirl air. The paper suggests that it should be the optimum operating condition when the dimensionless number XJ is nearly equal to 1.
【Fund】: 国家重点基础研究专项基金资助项目 (G19990 2 2 2 0 9)~~
【CateGory Index】: TK224
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