Electrostatic precipitator(ESP)

Specifications

The electrostatic precipitator (ESP)not only can removing the bacteriosome,but also can kill the harmful bactera.

The electrostatic precipitator (ESP)not only can removing the bacteriosome,but also can kill the harmful bactera.

 

Electrostatic dust collectors use electrostatic charges to separate dust from the dusty air stream. A number of high voltage, direct current electrodes (carrying negative charge) are placed between grounded electrodes (carrying positive charge). The dust borne air stream is passed through the passage between the discharging (negative) electrodes and collecting (positive) electrodes. Dust particles receive a negative charge from the discharging electrodes (ionizing section) and are attracted to the positively charged grounded electrode (collection plates) and fasten on to it. Cleaning is done by rapping or vibrating the collecting electrode wherein dust particles fall away. Cleaning can be done without interrupting the flow.

 

For more thorough cleaning, the collection cell can be removed and washed by hand or in a parts washer with an aluminum safe detergent.  Some ESP air cleaners have automatic self washing mechanisms.

The basic components of an electrostatic precipitator are (i) power supply unit (to impart high voltage, uni- directional current) (ii) an ionizing section where charge is imparted to dust filled air stream (iii) cleaning system to remove dust particles and (iv) housing for the precipitator.

 

Design Considerations

• Plates have to be maintained at precise distances. This calls for special tooling.
• Installing insulators in compartments through which air is blown or drawn from outside, reduces dust particles collection on insulators. This increases life of insulator in heavy load conditions as well.
• Since even flow distribution is critical to achieve 99% precipitation, care must be taken such that charged particles quickly lose static charge. In poor velocity distribution circumstances under atmospheric conditions of low humidity, particles may not lose charge, sometime indefinitely. In such cases all surfaces become collecting surfaces and this phenomenon is called plating.
• Plating is a major disadvantage in Two Stage Precipitators and can be avoided by having even flow, lower speed air stream flow. Plating can also be countered by applying an alternating current to the high voltage power supply that effectively removes charge from particles coming through the collector. This method can be used effectively even at fairly high speeds velocities.