Wet Electrostatic Precipitator

BETH® Wet Electrostatic Precipitator:

The wet electrostatic precipitator complements the product range of AEROB-BETH® Lübeck with an extremely versatile dedusting system that is perfect for any process in which special dust or gas characteristics make dry separation impossible.

Our approved wet electrostatic precipitators are unbeatable since many years in view of operational safety, long-life cycle and collection efficiency. They are excellent suited for precipitation of finest with dust afflicted water drops, of aerosols and emissions containing tar or oil.

Another positive effect is the additional bound of toxic elements like for example HCl, SO2, NaCl and HF.

Principle of function

The process gas enters the electrostatic precipitator horizontally, and is spread to a uniform flow profile across the entire filter cross-section by means of a gas distribution system. By means of the high voltage (78 to 135 kV) applied between the corona discharge electrodes and the honeycomb-type collecting electrodes, the process gas and the dust particles are electrically charged.

On the route through the electric field, the charged particles are transported to the honeycomb-type collecting electrodes by the electric field strength, where they agglomerate with the existing dust particles and flushes off by a periodically working washing system. The drain water flows from the honeycombs through the gas distribution system to the filter bottom. The purified gas leaves the filter through the gas outlet hood.

Short Description of the Technology

• Optimum gas distribution below the electrical field by a perforated plate with electric rectifier and adjustable baffle plates
• Gas conditioning and constant wetting of the electrodes by means of a fog nozzle system, located between the gas distribution and electrical field
• Vertical gas flow of the honeycomb designed precipitation electrodes
• Corona discharge electrodes, made of stainless steel tape with bolt mounting and individual weight tension, are located centrally within the centrally arranged honeycombs
• Cleaning of electrodes by a periodically working flushing water system above the electrical field
• Insulators are held dry with rinsing air
• Large precipitation surface on small footprint area
• Optimum corrosion protection by special interior coating or execution in stainless steel
• Dust, containing almost saturated exhaust gases, does not form a problem for cleaning
• The specific electrical dust resistance does not play a role, since the resistance in saturated atmosphere is always in an area favourable for the separation
• Finest and rough drops from upstream system components, like scrubbers, driers or quenches, can be collected to meet the required emission values
• Aerosols and critical fine types of dust with a very low settling velocity are separated optimally
• Flow rates of 1,000 to 500,000 m³/h (from 35,300 to 17,700,000 cu.ft.) at temperatures of approx. 10 - 75 °C are handled without a problem. At higher temperatures an additional cooling zone is necessary

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