EnglishFrenchDutch
because          
"air is our first         
nutriment & medicine"         
(Hippocrate, 400BC)         
PDF Print E-mail

Electrofiltration - "Plate"  (EF-P)

 

 

Content

1. Process description

2. Applications

3. Advantages of plate vs column electrofilters

4. Advantages of electrofilters

5. Models

6. References

1. Process description 

The "Plate" Electro-filter 'EF-P) is a 2 steps filtration system for separating sticky or non sticky submicron particles.

 

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.            

 

                         

 

These 2 filtration steps are integrated in an "electrofiltration cell". Our EF cells are robust and are made of one piece. We do not recommend electrofilters with cells in parallel, which reduces the filtration capacity and creates problem with isolator contamination
 

 

 

The emission preferably flows upwards through the cell, coming first into contact with the ionisers

 

The largest cell can handle flows up to 10.000m3/h

 

For higher flow, the gas stream is divided in separated electrofiltration chambers;

 

 

 

If the emission contains non sticky particles, like fluid oil dropplets, the collected fluid simply drops down and is collected at the bottom of the electrofilter.

 

If the emission contains sticky particles, an integrated CIP (cleaning in place) is recommended (option).

 

The T must be preferably under 40C in presence of oily materials; above this temperature, a volatile fraction still may be present in the emission, that will later condensate in a downstream filtration step or in the chimney. A temperature higher than 80C may also cause plate blending

 

In order to improve the abatement efficiency, 2 cells can be installed in series;

Above the last electrofiltration cell, a deioniser is installed in order to neutralise the electrical charges

If requested, a fan can be integrated in the electrofilter

 

Cleaning-In-Place (option)

The cleaning fluid, stored in the vessel under the electrofilter, is pumped through a perforated rod moving above the cell, each hole being oriented between 2 plates, spraying the cleaning downwards.

 

The risk of self-ignition of our electrofilters is very small. In order to protect it against fire coming from ducts or machines, a fire-extinguishing system can be also integrated in the electrofilter

 

2. Applications 

Sticky particles, smoke, oil haze, aerosol removal at T < 60C

 

3. Advantages of plate  vs column electrofilters 

  • Compact system
  • High collection surface per volume unit

4. Advantages of our electrofilters 

  • Wide range of modular systems designed for any kind of particles and gas flow rates
  • Electrofiltration cell: robust and single bloc structure
  • Collecting plates: made of aluminium or stainless steel; space between the plates adjustable
  • Ionisers: no breakable wires but resistant dentate plates
  • Fully automated CIP with integrated water/oil separator and water recirculation

5. Ultravent II Models: 

 

 
 
 

 

Ultravent II with EF cells UVFF900:

4.000, 8.000, 12.000 m3/h

Models:
D: 1 x demister
DE: 1 x demister + 1 x EF cell
EE: 1 x demister + 2 x EF cells
E+:  1 x demister+ 1 x EF cell + 1 x absolute filter

 

This model integrates a washing unit underneath and a fan above the EF cells. Many options regarding type of inlet/outlet, heat recovery, cleaned air recirculation, etc exist. Please contact us for more information.

 
Ultravent II with EF cells UVFF1350:
5.000, 10.000, 15.000, 20.000m3/h

 

For higher flow rates, electrofilters  must be installed in parallel

 

6. References 

More than 1000 references in the food & beverage and in the steel/moulding industry

More than 500 references with integrated cleaning-in-place

 

© 2008 Air Quality Concept