ENV-10-06 Next Generation Wet Electrostatic Precipitators

Description:

A WESP can readily collect acid aerosol and fine particulate due to greater corona power and virtually no re-entrainment. The WESP can also enhance collection of Hg (Hg ash & Hg+2). The main historical limitation associated with wet precipitators has been the higher cost of special alloys and stainless steel material used in their manufacture. This new technology WESP, based on fabric membrane for the collecting electrodes, dramatically reduces weight and cost, compared to conventional, metallic WESPs. Operation of several pilot units using the membrane technology has demonstrated excellent PM removal efficiency. The first commercial- size unit, collecting fine particulate and sulfuric acid mist emitted from two boilers firing No. 6 oil with 4% sulfur, shows high SO3 removal as well. The operation and performance of this 5 year old unit, will be described. The Benefits of being able to operate the unit as a condensing WESP will also be described.