M.Ing. / The performance and reliability of induced draft fans are of ever growing concarn in industry, especially in the power generation industry. The reliability and plant efficiency depend on the design conditions of all plant components. Induced draft fans handle high temperature flyash-laden flue gas, and are often plagued by mass-flow deficiencies and excessive vibration in fossil fuel powerplants [1]. In this research an existing induced-draft fan is analysed to investigate the occurrence of high stresses forming on the impeller, as these stresses lead to cracks appearing on the centre plate of the impeller. The basic approach used to address this problem is implementing the Finite Element Method starting with different cantilever beam configurations to simulate the connection of the blade with the centre plate. Geometries are kept constant to facilitate in the practical set-up implementation stage of the dissertation. The practical set-up is used to verify the results obtained from the Finite Element Method program, and it serves as a benchmark test for evaluating the further use of the chosen Finite Element Method program. A simplified Finite Element Method model is presented for the induced draft fan. Static and frequency analyses are done to determine the characteristics of the fan structure. Lastly an advanced dynamic analysis is done on the specific fan. Different ramp force functions are used to simulate different start-up curves for the fan. A conclusion will be drawn from the dissertation, and recommendations will be made for similar future research work.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:uj/uj:1934 |
| Date | 24 January 2012 |
| Creators | Henning, Petrus Francois Joubert |
| Source Sets | South African National ETD Portal |
| Detected Language | English |
| Type | Thesis |
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