Membrane Electrostatic Precipitation

摘要

Because of their widespread use, electrostatic precipitators (ESPs) could play a greater role in control of primary and secondary PM2.5. However, current ESPs are not well suited for such difficult applications. Particulate re-entrainment, charging difficulties in the 0.1-1.0 μm range, and turbulent transport hamper primary PM2.5 control. Field disruptions due to spraying (misting) of water and collector surface corrosion limit applicability of current wet ESPs in the control of secondary PM2.5. Researchers at Ohio University have patented novel membrane collection surfaces and cleaning schemes to address these problems. Novel corrosion-resistant surfaces can be cleaned via non-disruptive techniques in dry ESPs, or through continuous wet techniques. This paper presents some of the results of the study of enhanced electrostatic precipitation, which indicate that novel membrane materials collect ash as efficiently as steel plates. In addition, results from wet ESP tests indicate that woven, corrosion-resistant materials can be completely cleaned via low velocity water while maintaining the charging corona under all operational conditions due to elimination of spray.