How to Ensure the Stability of Dust Removal Boiler Fan Blades

How to Ensure the Stability of Dust Removal Boiler Fan Blades

Regarding the flow characteristics of dust removal boiler fan dampers, the performance of these dampers can be comprehensively evaluated using the initial rotational coefficient’s resistance coefficient as the primary indicator. Based on the radial and axial distribution characteristics of the valve flow parameters, and taking into account the uniformity of water flow and pre-rotational factors, it is recommended to extend the length of the blade chord at the centre of the gate flow passage to optimise the stability of the waterfall and improve the shape of the straight blades. Using computational fluid dynamics (CFD) techniques and acoustic analysis theory, this study investigated the fundamental frequency noise generated by a twin-source and the surface of the dust removal boiler fan blades under three different flow rates. Through CFD simulation, a three-dimensional transitional flow field of the dust removal boiler fan was obtained. Based on the aeroacoustic equations, the twin sources are extracted from the interior of the vortices, and the blade noise equations are utilised for simulation. To make the computational model more realistic, a multi-zone acoustic boundary element model is employed. In an unstable flow field, pressure fluctuations on the vortex surface are primarily influenced by the fundamental frequency, whereas pressure fluctuations within the blade do not exhibit a distinct fundamental frequency component. The vortex tongue is a significant source of fundamental noise. As flow rate increases, noise radiated from vortices rises sharply, whilst the fundamental frequency noise generated by the blades is smaller than that from the vortices. A new design method for centrifugal fans has been proposed, particularly for high-flow conditions. Utilising the developed technology, the aerodynamic optimisation design of the dust removal boiler fan was tested and evaluated in the field. It is important to note that there are issues with the numerical simulation of three-dimensional viscous flow fields. Based on this method, various prototypes were developed, resulting in significant improvements in aerodynamic and noise performance. Practice has proven this method to be correct. Using mature commercial software, three-dimensional simulations of the flow field within the centrifugal fan were conducted to determine velocity and pressure. This analysis captures many important phenomena in dust-removal boiler fans and provides a reference for specific applications.