Function of Electrostatic Precipitators
The functionality of an electrostatic precipitator is based on the technology of dry and wet electrostatic precipitators. All of the electrostatic filters we produce are tubular electrostatic precipitators.
APF's dry electrostatic precipitators include the APFenergyTowerFilter™ and APFenergySmartFilter™ filter ranges. These use electrically charged rods to ionize the particles in the fine dust. Further technical details on the exact process can be found on this page.
For more information on wet scrubbers such as the APFenergyWoodgasFilter™, please click here.
Operating Principle
The APFenergySmartFilter™ and the APFenergyTowerFilter™ are based on the principle of dry electrostatic precipitators and are tubular electrostatic precipitators. This means that they do not correspond to conventional plate electrostatic precipitators but have a tubular design. The collecting electrodes (anodes) are designed as tubes, in the center of which the rod-shaped spray electrodes (cathodes) run axially over the entire length of the tube.
In the standard version, the APFenergyFilter™ are used in negative pressure operation. The design of the APFenergyFilter™ ensures that the gas laden with dust particles in the electrostatic precipitator is evenly distributed over the individual tubes and flows through them axially. The negatively charged discharge electrodes give off electrons to the gas laden with dust particles, causing free gas molecules to be ionized. These ionized gas molecules (negative ions) attach themselves to the dust particles and in turn charge them negatively.
The negatively charged dust particles are attracted by the positively charged tubes (collecting electrodes), adhere to them and form a layer of dust that has to be cleaned off at intervals. The cleaned exhaust gas is discharged into the chimney. The special design of the APFenergyFilter™ allows a low-noise, periodic and fully automatic cleaning of the discharge and precipitation electrodes. This achieves a significantly better and more even cleaning result compared to the usual tapping of the electrodes. Specially developed exhaust gas paths integrated in the filter allow the exhaust gas to be bypassed during the short cleaning period in order to prevent increased dust emissions during cleaning.
Depending on the customer's requirements, the brushed-off dust is either automatically filled into containers via a screw discharge or collected in a dust bunker for later extraction.