| Summary: | 碩士 === 國立中興大學 === 機械工程學系所 === 105 === Electrostatic precipitator (ESP) is widely applied in industrial facility for dust collection. Especially, for the facility with high power output, such as coal-fired power plants, cement kilns, sugar refineries and glass factories.
According to Deutsch equation, efficiency of dust collection can be increase, when velocity of gas is low and uniform. Although there is more attention on the electric field, flow pattern in front of collecting chamber is important.
The purpose of the research is to investigate the relation between flue design and flow uniformity on inlet plane of chamber. The results can be applied for redesign and adjustment of existing. In this work, different types of inlet transition, installation of guide vane in flue system and installation of perforated plate are considered as simulation parameter.
Inlet transitions of ESP affect the flow pattern directly. For same types of inlet transition, the inlet direction directly affects the uniformity of flow. The highest %RMS value occurs in K-4 and K-5, 43.18% and 42.47%. %RMS value of K-1, K-2 and K-3 are close. The result of pressure drop shows that K-4 and K-5 is the highest, 961.92 Pa. The pressure drop of K-2 and K-3 are 38.14 Pa and 37.69 Pa. These results show that the inlet direction has greater reaction with the result of pressure drop than %RMS.
The pressure drop, which is caused by the installation of perforated plate and guide vane are almost independent. For improving the uniformity of flow, perforated plates work more effective than guide vane. However, guide vane is more capable in decrease the pressure drop.
By applying on two different ESP model, the procedure of verifying perforated plate work effectively in simulation. In the real ESP model, by following the procedure, the %RMS is down to 10%.
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