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Electrofiltration

 

Fine particle & aerosol abatement with the power of ionisation !

 

 

 

 

 

Content

1. Introduction

2. "Plate" Electrofilters

3. "Column" Electrofilters

4. Advantages of electrofiltration

 

1. Introduction 

Electro-filtration is a 2 steps filtration system for separating sticky or non sticky submicron particles. It is the best system for separating very fine particles, down to 0.01µm, without creating pressure drop problems.

 

The first step consists in positively ionising the contaminating particles via special ionisers.

The second step consists in collecting the ionised particles on grounded surfaces.

 

2. "Plate" Electrofilters (EF-P) 

The 1st generation of electrofilters, called the “plate electrofilters” (EF-P), perform these 2 steps successively in an electrofiltration cell, integrating the ionisers and collecting plates, alternatively grounded and positively charged

 

The first step consists in positively ionising the contaminating particles at around 6 to 12kV, via stainless steel wires or dentate plates. The second step consists in forcing the ionised particles to flow between aluminium or stainless steel plates, one side being grounded and the other side positively charged. The positively charged plate repels the particles that precipitate on the grounded plate. 

 

                         

 

For more information, click here

 

3. "Column" Electrofilters (EF-C) 

The 2d generation of electrofilters, called the “column electrofilters” (EF-C), keeps ionizing the particles during their residence in the electrofilter. In the center of the column, an ionisation rod permanently ionizes the particles during their residence in the column. The ionized particles are then attracted on the grounded surface of the column.

 

 

These electrofilters can work at higher ionisation voltage, up to 150kV, what improves the removal of very fine particles, mainly those between 0.1 and 1µm, that are difficult to separate, even with fine mechanical filters:

 

 

This concept has some major advantages:

  • the particles have a longer contact time with the ionizer, what increases the removal efficiency
  • the emission temperature and relative humidity may be high, up to respectively 300°C and 100%
  • the distance between the ionizer and the collection surface is high, what drastically reduces the risk of short-circuit and reduces the cleaning frequency when contaminants accumulate on the surface. This design is consequently particularly recommended when the air is humid,
  • the surface can be continuously sprayed with water in order to constantly evacuate the contaminants to the drain. This concept is called a “wet electrofilter

 

For more information, click here

 

4. Advantages of electrofiltration 

  • High particle removal efficiency down to 0.01µm
  • Low energy consumption and minimal maintenance
  • Low initial pressure drop ( < 1000Pa) and no pressure drop increase
  • Very long service life
 

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