Known wet electrostatic precipitators are large and inefficient. The present invention enables the production of smaller, more efficient and long lasting wet electrostatic precipitators by the addition of a central bore in the inner electrode through which a first purge flow is passed and directed into the precipitator chamber, perpendicular to the direction of flow of the gas to be treated through the chamber to urge the particulate into the water curtain. A second, larger, cleaning purge flow is also provided to disturb the water curtain such that it cleans the inner electrode of any deposited particulate.

Systems and methods for cleaning a precipitator including plates and wires associated therewith using dry ice blasting equipment are described. The dry ice blasting equipment primarily includes an elongate wand. The elongate wand is configured to blast dry ice at a high level of pressure to ensure that debris and biproduct that is caked or coated onto the plates and wires is disengaged from the plates and wires. For instance, the dry ice may be blasted at pressures of at least 100 pounds per square inch, and more preferably at least 400 pounds per square inch. To achieve this pressure, the wand may be at least 2 feet in length, and more preferably at least 6 feet in length.

Systems and methods for cleaning a precipitator including plates and wires associated therewith using dry ice blasting equipment are described. The dry ice blasting equipment primarily includes an elongate wand. The elongate wand is configured to blast dry ice at a high level of pressure to ensure that debris and biproduct that is caked or coated onto the plates and wires is disengaged from the plates and wires. For instance, the dry ice may be blasted at pressures of at least 100 pounds per square inch, and more preferably at least 400 pounds per square inch. To achieve this pressure, the wand may be at least 2 feet in length, and more preferably at least 6 feet in length.

A collecting electrode element for an electrostatic air cleaner with a reduced weight can be constructed with a lightweight conductive core sandwiched between particle collection layers which are supported and stabilized by a rigid frame. The conductive core may be conductive foil, conductive film, conductive ink, or conductive glue. The particle collecting layers may be flexible open-cell foam such as melamine which may be compressed between opposing frame elements. The frame may leave most and preferably at least 90% of the surface of the particle collecting layers exposed. The frame may have opposing frame elements secured to each other at a compressed area of the particle-collecting layers.

A collecting electrode element for an electrostatic air cleaner with a reduced weight can be constructed with a lightweight conductive core sandwiched between particle collection layers which are supported and stabilized by a rigid frame. The conductive core may be conductive foil, conductive film, conductive ink, or conductive glue. The particle collecting layers may be flexible open-cell foam such as melamine which may be compressed between opposing frame elements. The frame may leave most and preferably at least 90% of the surface of the particle collecting layers exposed. The frame may have opposing frame elements secured to each other at a compressed area of the particle-collecting layers.

A boiler includes a flow channel having a selected chamber delimited by walls made at least partly of conductive material and being grounded, and a device arranged at least partially inside the selected chamber. The device includes an ion source comprising a corona electrode and an electrically passive body having an opening for corona discharge. The corona electrode is located inside the electrically passive body. A fan/shielding-gas connection is in the electrically passive body. The shielding gas exits the electrically passive body through the opening. The device also includes a high-voltage source for the corona electrode. The walls of the selected chamber of the boiler form a ground potential for the corona electrode to collect the fine particles of flue gases on the walls of the selected chamber.

The present invention relates to a filter apparatus (1) for dedusting gas comprising one or more electrostatic precipitators (100), in each of said electrostatic precipitators (100) there being inserted at least one filtering unit (300) comprising, in turn, a plurality of filtering cells (301), e.g. of the wall flow type. The present invention also relates to a dedusting process for treating industrial gas. In particular, the dedusting process according to the present invention implemented by the filter apparatus having improved dusting efficiency, which is the object of the present invention, allows the treatment of gas coming from industrial processes, such as coal boilers, cement works, incinerators and like.

The present invention relates to a filter apparatus (1) for dedusting gas comprising one or more electrostatic precipitators (100), in each of said electrostatic precipitators (100) there being inserted at least one filtering unit (300) comprising, in turn, a plurality of filtering cells (301), e.g. of the wall flow type. The present invention also relates to a dedusting process for treating industrial gas. In particular, the dedusting process according to the present invention implemented by the filter apparatus having improved dusting efficiency, which is the object of the present invention, allows the treatment of gas coming from industrial processes, such as coal boilers, cement works, incinerators and like.

A gas cleaning apparatus includes: an ion source to provide an ion beam, a charging zone to form charged particles by exposing particles of a particle-laden gas to the ion beam, and a filter element to collect the charged particles,
wherein the ion source includes a corona electrode to generate ions by a corona discharge, the ion source is arranged to form the corona discharge in a protective gas, and wherein the apparatus is arranged to form the ion beam by using an electric field to draw the generated ions from the corona discharge to the particle-laden gas.

A wet electrostatic precipitator includes an ancillary component cleaning device with a cleaning assembly moveably supportable within an electrostatic precipitator; the cleaning assembly having a scraper configurable to abut an ancillary component of the electrostatic precipitator, such that movement of the cleaning assembly within the electrostatic precipitator causes movement of the scraper with respect to the ancillary component and wherein the ancillary component includes a component of a separation assembly provided in the wet electrostatic precipitator to maintain electrical isolation between the discharge and collection electrodes.