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Electrostatic
Precipitators
Acid
Mist Precipitator - Wet
Available in FRP/Stainless Steel Construction or/
Hybrid FRP/Lead/Stainless Steel Designs
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 Full FRP casing to reduce erection time
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Inlet and Outlet positioned at top to reduce ducting requirements
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Stainless steel high voltage system (not shown for
clarity)
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Easily cleaned distribution system which maintains uniform tube velocities
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Collecting tubes and tubesheet of
conductive FRP construction to enhance high voltage power arc earthing and to encourage even water film distribution during washing
cycles
Construction Features The external casing of the ESP enclosing the interior parts is fabricated from FRP. The collecting tubes and tube sheet may be supplied in
conductive FRP construction. The discharge wires generate an even corona and
are of full stainless steel construction.
General construction details are similar to the De-tarrer/De-oiler ESP. Principle of Operation
The casing enclosing the interior parts is fabricated from steel plate, heavy gauge wall for high pressure applications and 5mm thick wall for standard pressure units. Access doors are provided in the upper and lower casing sections.
Located on top, but on opposite sides of the casing are the insulator compartments housing the high voltage system support insulators. Steam coils are fitted to the compartments to heat the metal and avoid condensation. Alternatively, the compartments may be electrically heat traced. A blanket of insulation, clad with sheeting is fitted to assist in heat retention.
The collecting system consists of a number of steel pipe sections suspended vertically from the tube sheet and seal welded to it. Each pipe is considered one gas passage. The tube length and diameter are specific to each application. The high voltage system consists of an individual electrodes per collecting tube, suspended from an upper frame and held taut by a weight per electrode. A frame is fixed at the bottom of the field for alignment and stability purposes. The upper frame is fixed to the support beam, which is supported by the insulators either side of the casing.
A transformer-rectifier to supply the required high voltage is provided and connects to the high voltage discharge system via bus-ducting. The control cubicle for operation of the transformer-rectifier is supplied separate for mounting in a convenient switch room. Benefits
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Fully enclosed collecting tubes within the casing, results in equalized air pressure on each side of the tubes preventing collapse. This can be a problem on units with exposed
tubes.
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Very high collection efficiency of acid mists.
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