How to Improve the Impeller Efficiency of Boiler Dust Extraction Fans with Cutting Blades

How to Improve the Impeller Efficiency of Boiler Dust Extraction Fans with Cutting Blades

Currently, the domestic boiler dust extraction fan industry is advancing, with emerging industries focusing on addressing the issue of low coupling efficiency in the absorption of boiler dust extraction fans. During the coupling process, there is a phenomenon where time signals and frequency signals become separated. This method can effectively diagnose issues of unstable flow in boiler dust extraction fans; therefore, it is recommended to sever the connection between the impeller cover and the centrifugal fan blades. By utilising high-pressure gas from the positive pressure side of the blades to displace the low-speed wake on the negative pressure side, the fluid directly supplying power to the low-speed propeller weakens the impeller, creating a jet-type wake structure. Based on the secondary flow, experimental results indicate that under design flow and low flow conditions, the blade boundary layer behind the impeller is reduced, the velocity distribution around the flow path becomes more uniform, and the flow state within the impeller is improved. This enhances the overall performance of boiler dust extraction fans. Currently, to optimise design and provide useful references for improving the efficiency of propeller machinery—which includes compressors, blowers and boiler dust extraction fans, categorised as centrifugal or axial flow based on airflow direction—boiler dust extraction fans serve as vital process equipment for supplying combustion air in industrial production, playing a significant role in the national economy and daily life, with a very large market. Through practical research, the influence of spherical particles on the wear resistance of fans has been investigated. Spherical particles adhering to the pressure surface of boiler dust extraction fan blades can effectively enhance the wear resistance of the fan. Furthermore, by altering the distribution of the blades, the primary wear areas can be controlled. An analysis of the air protection mechanism of boiler dust extraction fans, including dust, has been conducted. Currently, existing research methods, numerical simulations and computational approaches regarding the airborne noise of boiler dust extraction fans are incomplete. The centrifugal airflow noise is simplified using an idealised rigid shell model.