| Summary: | 碩士 === 國立中央大學 === 機械工程研究所 === 92 === Successful commercialization of advanced coal-based power generation technologies will require highly efficient removal of ash particles from gas streams at elevated temperatures and pressures. Particulate loading must be maintained at very low levels (e.g., smaller than 20 ppmw), and the concentration of large particles (greater than 5 μm) must be minimized to ensure the reliable operation of downstream combustion turbines in these environments. Previous studies have suggested that the ceramic and metallic candle filters can be used to meet these ambitious goals, but problems remain with the reliability of filter elements, failsafes, and sealing systems. For these reasons, alternative means of particulate removal, such as granular bed filters, especially moving bed filters continue to be developed. However, such equipment has hitherto met with problem of stagnant zones in moving bed. An internal insert can be used to prevent forming of stagnant zones and to widen the central flowing core of the filter moving bed.
This paper presents the results of a study of the flow patterns in a 2-D cross-flow moving granular bed with three different systems of internal inserts in louvered wall granular moving bed and with system without internal inserts but with curved louvers. In experiments we chose 2-4 mm quartz sand as the granular media. The flow patterns of granular media in the systems with and without inserts were studied experimentally. The optimal placement of inserts was demonstrated to efficiently diminish the stagnant zones near the louvers.
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