The Reduced Entrainment Precipitator (REP) will have improved collection efficiency for dusts having, either high or low electrical resistivities. This objective is accomplished by providing a porous collection surface. A small portion (typically less than 20%) of the dirty gas stream is drawn through the collected dust cake and the porous collecting plate by a separate fan. This small flow through the dust provides an aerodynamic force to reduce re-entrainment of the dust.Typical fabric filter dust cake pressure drops, the dust retaining force, can be orders of magnitude larger than the re-entraining force, the dynamic head of the flowing stream. The provision of a significant aerodynamic force to counteract reentrainment has at least two potential
Benefits: (1) Higher Precipitator through-put velocities may be used thus reducing the size of the Precipitator. (2) In a conventional precipitator dust retention forces are provided provided by corona current through the dust cake. Elimination of the need for corona current for dust retention in turn eliminates the dependence of the process on dust resistivity, either high or low.The REP is a combination of electrostatic precipitator and fabric filter technologies that provide a proprietary particulate collection device having a significant improvement in particle collection capability, at greatly reduced capitol and operation costs. The potential market for this is the entire new precipitator market and should average 200 million dollars per year over the next 5 years.
