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SELF-REGENERATIVE ELECTROSTATIC PRECIPITATOR
EP3112030
The invention relates to a self-regenerative electrostatic precipitator (10) of the type comprising a discharge electrode (1) located inside a gas conduit (3) for generating a corona discharge and for depositing solid particles in suspension in a gas stream (11) circulating through the conduit (3) in a deposition layer (4) on the inner wall of the conduit (3). The electrostatic precipitator (10) comprises at least one cleaning assembly (7) arranged outside the conduit (3), each cleaning assembly (7) having at least one induction coil (6) wound around the conduit (3) for heating the wall of the conduit (3) by electromagnetic induction. The electrostatic precipitator (10) reduces emissions of solid particles in suspension in a gas stream.
- Negligible pressure drop and draft effect.<br> - No influence on the heat generator (boiler or stove).<br> - High trapping efficiency for all particle sizes (0.1 to 5 µm).<br> - High compactness allowing its installation by replacement of a standard chimney section.<br> - Completely autonomous operation and free of user intervention for cleaning.<br> - No re-entrainment of particles while cleaning.<br> - Blend of mature technologies (both electrostatic precipitation and induction heating are well known technologies and widely used by different sectors).<p> FESARI, induction-based self-regenerative electrostatic precipitator, will allow biomass boilers manufacturers, distributors and installers to comply with European regulations, Ecodesign Directive (Directive 2009/125/CE, transposed into Spanish legislation by the Real Decreto 187/2011).
FESARI (induction-based self-regenerative electrostatic precipitator) is an effective, robust and innovative solution to tackle high particulate emissions from biomass boilers and stoves. Several of its characteristics make FESARI the only alternative to replacing the most efficient systems, highlighting the cleaning of the precipitator without mechanical intervention on its surfaces.<p>
The use of biomass as fuel generates emissions of air pollutants that can contribute significantly to the detriment of human health: suspended particles matter (PM2.5), black carbon (BC) and, together with these particles, PAHs (polycyclic aromatic hydrocarbons). Currently there is no effective method to reduce particulate emissions from a biomass boiler.<p>
Physical filtering has a detrimental effect on the pressure in the furnace generating a risk of potentially toxic leaks. Cyclones have no filtering capacity at this particle size and electrostatic filters (ESP), common in other powers, have not yet been adapted for this small scale. Electrostatic filters do have the trapping efficiency and low-pressure drop required for this application. However, cleaning of the retention surface, usually by mechanical means, generates the inconvenience of re-emitting a large part of the retained matter plus exposing the person responsible for its maintenance to potentially harmful substances.<p>
Both the electrostatic filter (ESP) for small scale (<500kW), and the inductive cleaning have been successfully tested at the laboratory level.