Electrostatic separators for insulating fluids

Electrostatic separators have been used in purifying hydraulic fluids, fuels, petroleum refining and coal liquefaction streams, lubricating oils, and other insulating liquids. The designs, applications, and separation efficiencies of these separators are discussed. The separators are categorized as employing either spatially uniform or nonuniform electrical fields, or electrical fields in conjunction with other physical separation techniques. They require low inlet pressures, draw low current, and are resistant to plugging. They are rugged, allowing use in high-temperature and -pressure applications. Many designs allow continuous or semicontinuous operation. Electrostatic separators can separate particles of similar density, shape and size by differences in electrical properties