Prevention of Dust Deposition in Sampling Line by Vibration
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概要
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Stack dust sampling is often carried out using a sampling nozzle and a certain length of sampling line which is connected with a dust sensor or a dust collector.<BR>Dust deposition was experimented using CaCO<SUB>3</SUB> powder (mmd=4μm) as test dust and 2m of sampling tube (dia.=φ6-14 mm). The test dust was deposited about 45-53% upstream of the dust collector, and especially 20-26% in the 90° bend of the sampling nozzle.<BR>In order to prevent dust deposition the mechanical vibration was added to the sampling line using a magnetic vibrator. As a result of the experiment the prevention effect or dust re-bounce was confirmed significantly with the stronger vibration effect, which was defined as the ratio of vibration acceleration to vibration frequency. About 86% of dust deposition was reduced in the range above 1.5 G/Hz for flyash and CaCO<SUB>3</SUB> dust respectively, though vibration effect was applied up to 1.7 G/Hz in this experiment.<BR>Vibration Reynolds number was adopted by non-dimensionizing the strength of vibration effect. It was found that the relation between vibration <I>Re</I> and reduction of dust deposition was expressed in a curve line for both the test dusts, and from the relation high reduction rate over 90% can be predicted to be obtained for above 700 of vibration <I>Re</I>.
- 社団法人 大気環境学会の論文
社団法人 大気環境学会 | 論文
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