![]() Lower SCA means a smaller, less expensive unit. Increasing migration speed brings a higher particle collection efficiency with lower specific collection area (SCA) than conventional precipitators. The greater the electrostatic fields strength, the greater the particle migration speed (speed component towards the collection tube). The field strength is consistently maintained at high levels with minimal sparking, resulting in the highest available efficiency. This reduces installation and maintenance times and improves performance. The GEA WESP is a proprietary, robust design with a unique alignment mechanism to hold electrodes rigidly in place. ![]() The use of electrostatic forces minimizes energy costs when compared to other technologies which require large amounts of energy to overcome resistance to air low These can include heavy metals such as lead, arsenic or cadmium, condensed acid aerosols like sulfur trioxide (SO 3) or condensed volatile organic compounds (VOC’s). WESP are unmatched in terms of operational safety, durability and separation efficiency and are used to treat gas streams with sub-micron particulate, aerosol or fumes. They are ideal for separating the finest dust-laden water droplets, aerosols and tar as well as oil-containing exhaust gases. Wet Electrostatic Precipitators (WESP) are used in many processes in which dry separation is not possible due to the characteristics of the dust or gas. If necessary, a small flushing air stream is used to keep the insulator interior clean. ![]() The discharge frames of each precipitation field are suspended from four support insulators mounted on the roof structure of the precipitator casing.Įach insulator is equipped with electric heating to ensure that the temperature at the insulator will not be below the dew point when the plant is started up cold. by bolting and welding, prevents spark erosion at the fixing points. Firm fastening of the electrodes to the frame, e.g. This design eliminates electrode oscillations resulting from the electrical field and the gas flow. The precipitators are equipped with rigid discharge frames made of welded tubes into which the discharge electrodes are securely fixed. The roof covering and side walls are specifically designed to withstand the internal precipitator pressure and the wind forces. The loads are transmitted via stanchions from the roof beam ends to the precipitator support structure. The discharge and collecting electrodes are supported by box-type roof beams. The plates are shaped as to provide quiescent zones to prevent the collected dust from being stirred up and re-entrained by the gas stream. They form passages, in the center of which, the discharge electrodes are suspended from insulators. In this type of Electrostatic Precipitator, the collecting electrodes are parallel vertical plates. GEA´s experience building Electrostatic Precipitators goes way back with well over 12.000 units having been supplied to firms all over the world.Ĭasing of frame-type design are a proven, reliable, and economical solution for horizontal precipitators. All designs are suitable both for dry and for wet, mist-laden gases. The negative gas ions produced, charges the dust particles which migrate under the influence of the electric field towards the collecting electrodes, there, they release part of their charge and are captured.Įlectrostatic precipitators may be of parallel-plate, segmental, honeycomb or tubular design. In the immediate vicinity of the discharge electrodes, corona discharges, generated thanks to the high filed strength, are produced and electrons are set free. They carry a direct current voltage that ranges from 20 kV to more than 100 kV depending on the precipitator´s design and application. The discharge electrodes (normally barbed strips or round wires) are suspended from insulators and have a negative polarity. The collecting electrodes are connected to earth via the precipitator casing. ![]() The dust particles suspended in the gas are electrically charged and migrate under the influence of a strong electric field towards the collecting electrodes where they are deposited. The physical principle applied in ESP sets no limit on the fineness of the particles to be collected, making it possible to achieve virtually any desired collection efficiency. GEA’s Electrostatic Precipitator (ESP) uses electrostatic force to remove particulates from a flue gas stream. ![]()
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