What parameters should be considered when optimising boiler induced draft fans?

What parameters should be considered when optimising boiler induced draft fans?

Currently, numerical calculations of three-dimensional unsteady flow are being effectively carried out for boiler induced draft fans. Therefore, for known boiler induced draft fan blades and aerodynamic performance, the response surface method was employed to perform a quadratic regression adjustment on the numerical results, establishing the relationship between two parameters and the efficiency and sound level of the boiler induced draft fan, and conducting an optimisation analysis. This has been carried out. Experimental results indicate that these two parameters have a significant impact on the efficiency and sound level of the front synchronous blades, and can reduce airborne noise. Simultaneously, aerodynamic performance can be maintained by combining reliable computational fluid dynamics techniques with the response surface method to guide improvements to the boiler induced draught fan and the experimental plan. The current research findings can provide reference material for the overall design of a series of energy-saving and noise-reducing centrifugal fans. The current status and progress of the internal flow field analysis of boiler induced draught fans are examined, and the advantages and disadvantages of various methods are analysed and compared. On this basis, various experiences have been summarised and optimised, providing a foundation for research into the internal flow field of centrifugal fans. Combining current further analyses with the status of relevant research, three-dimensional numerical simulations of the internal flow field within the centrifugal fan were conducted using software and flow characteristics, thereby determining the volumetric losses. Based on the simulation results, an arc-shaped baffle ring was designed. Numerical simulations of the boiler induced draft fan following the installation of the baffle ring indicate that, after its application, vortex intensity is reduced, the flow field is improved, and volumetric losses are significantly reduced. This software has been utilised to simulate boiler induced draft fans under various operating conditions. To address the internal flow field of the boiler induced draft fan, the influence of typical geometric parameters on flow and airborne noise was investigated. By combining an acoustic model with Large Eddy Simulation (LES), the noise generated by the airflow in the boiler induced draft fan was calculated. Experimental results indicate that the computational results under variable conditions are consistent with experimental values. The current research findings can provide valuable reference data for the optimal design of multi-blade boiler induced draft fans.