Abstract
In industrial applications such as chemical plants, cement factories, and glassmakers, large-sized centrifugal fans are commonly used for dust-laden flow processing. In many cases, the contamination is due to solid particles responsible for fouling and erosion issues. Erosion induces the reduction of mechanical resistance and, at the same time, the modification of the geometry and the surface characteristics of the internal flow path. The process works according to the characteristics of the erodent particles, such as dimension and hardness, which have to be coupled with the mechanical properties of the substrate, like hardness and roughness level. In addition to this, the intensity of the erosion depends on the dynamic characteristics of particles, especially velocity and impact angle. For these reasons, erosion-related issues are difficult predict and reduce. In an attempt to preserve the structural integrity of the internal walls, wear-resistant plates are positioned where the impacting contaminants are supposed to be more detrimental. In the present work, a combined experimental and numerical approach is proposed to evaluate the proper setup of wear-resistance plates over the flow path of a large-sized centrifugal fan. The results show how different regions (rotating and stationary walls) are subjected to different impact behavior, determining that the design of the position of the wear-resistant plate is not straightforward. Suggestions related to reducing the erosion intensity are reported, highlighting the possibility of designing the best compromise between erosion, performance, and costs.
Subject
Mechanical Engineering,Energy Engineering and Power Technology,Aerospace Engineering
Reference14 articles.
1. Glasser, A.D., Petlevich, W.J., and Sverdrup, E.F. (1980). Nature and Costs of Fan Erosion in Coal-Fired Electric Power Plants (No. EPRI-CS-1596), Westinghouse Electric Corp.
2. Simulation of particle-laden flows in a large centrifugal fan for erosion prediction;Turbo Expo: Power for Land, Sea, and Air,2014
3. Numerical simulation of the blade aging process in an induced draft fan due to long time exposition to fly ash particles;J. Eng. Gas Turbines Power,2019
4. Fritsche, M., Epple, P., Steber, M., and Rubwurm, H.J. (2017). ASME International Mechanical Engineering Congress and Exposition, American Society of Mechanical Engineers.
5. Performance Modification of an Erosion-Damaged Large-Sized Centrifugal Fan;Turbo Expo: Power for Land, Sea, and Air,2021