Asymmetric louver and cold filtration in Moving Granular Filter
碩士 === 國立中央大學 === 機械工程研究所 === 95 === The granular moving bed filtration technology used for high-temperature gas cleanup has been developed in United States, Japan and EU countries in last decades. One of the key difficulties in design of granular moving bed filter is the formation of stagnant zones...
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| Format: | Others |
| Language: | zh-TW |
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2007
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| Online Access: | http://ndltd.ncl.edu.tw/handle/80034486940602939788 |
| Summary: | 碩士 === 國立中央大學 === 機械工程研究所 === 95 === The granular moving bed filtration technology used for high-temperature gas cleanup has been developed in United States, Japan and EU countries in last decades. One of the key difficulties in design of granular moving bed filter is the formation of stagnant zones of filter granules in a moving bed with louvered walls. When stagnant zones exist, the dust coming with hot flue gas may plug the system. Gas pressure drop in moving bed continually rises and the filtration efficiency decreases remarkably.
Vertical shift of louvers on inlet or outlet wall of filter was proven to be an appropriate solution to diminish the stagnant zones. This paper presents the results of a study of the flow patterns and velocity fields of filter granules in a 2-D cross-flow moving granular bed systems with louvers shifted vertically in the moving bed. The optimum design that can diminish the stagnant zones effectively will be used to build a 3-D facility and install a dust generator in order to run the cold model filtration tests.
Second part of Thesis includes measurements of gas pressure drop and gas velocity distribution on inlet side of 3-D filter with louvers and sublouvers. Sublouvers are flow corrective elements that diminish stagnant zones in moving bed of filter media (silica sand).
In these cold tests the filter medium circulation rate and filtration efficiency were measured, too. The cold filtration test results, presented in this paper offer important data for designing the prototype of the moving granular bed filters.
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