Simulation and Optimization for the Airflow of the Inlet Duct to the Draught Fan in a Power Plant

Bin Jian, Hui Wan, Qiushuang Zhang, Guoming Hu


The various types of air fans account for about 40% of the total power consumption of the plant. The energy consumed by the fans is mainly used to overcome the flow resistance of the duct system. Thus reducing the total flow resistance of the system can effectively improve the economics of the plant. It is reported that the influence of the unevenness of the inlet airflow on the performance of the fan cannot be underestimated, and its influence on the pressure head far exceeds 5% of the general recommended value [1]. In view of this, it is significant to optimize the airflow conditions of the fan inlet and reduce the airflow resistance of the duct system. Computational Fluid Dynamics (CFD) is a valid numerical method for solving and analyzing the physical phenomena of fluid flow [2–3]. This paper used FLUENT to numerically calculate the flow field and the resistance characteristics of the airflow of the inlet duct leading to the draught fan of a power plant. Analyzing the characteristics of the airflow distribution, we proposed two modifications, and compared their numerical results to find the optimal one.


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