Abstract: Methods and apparatus for cleaning contaminant byproducts off of ionizing wire electrodes in ionizing blowers are disclosed. Disclosed apparatus include a housing with a gas-flow channel, an stationary ionizing wire, and a rotatable frame with supports for resiliently supporting the stationary ionizing wire within the channel. The ionizing wire produces charge carriers and has a surface that develops a layer of contaminant byproducts when an ionizing signal is applied thereto. The frame is rotatably mounted such that the supports clean the layer of contaminant byproducts off of the surface of the ionizing wire when the frame is rotated. Disclosed methods include providing an ionizing signal to the ionizing wire to thereby produce charge carriers and rotating the frame relative to the housing to thereby clean contaminant byproducts off of the ionizing wire.

Abstract: Methods and apparatus for cleaning contaminant byproducts off of ionizing wire electrodes in ionizing blowers are disclosed. Disclosed apparatus include a housing with a gas-flow channel, an stationary ionizing wire, and a rotatable frame with supports for resiliently supporting the stationary ionizing wire within the channel. The ionizing wire produces charge carriers and has a surface that develops a layer of contaminant byproducts when an ionizing signal is applied thereto. The frame is rotatably mounted such that the supports clean the layer of contaminant byproducts off of the surface of the ionizing wire when the frame is rotated. Disclosed methods include providing an ionizing signal to the ionizing wire to thereby produce charge carriers and rotating the frame relative to the housing to thereby clean contaminant byproducts off of the ionizing wire.

Abstract: A method of cleaning at least one collecting electrode of an electrostatic precipitator includes applying, in a first mode of operation, a first average current between at least one discharge electrode and at least one collecting electrode, and switching from the first mode of operation to a second mode of operation in which a second average current is applied between the at least one discharge electrode and the at least one collecting electrode, the second average current being a factor of at least 3 higher than the first average current, to achieve a forced cleaning of the at least one collecting electrode.

Abstract: An air cleaner is provided. The air cleaner may include a filter assembly having a plurality of stacked filters, a first case including a filter mount sleeve having the filter assembly mounted thereon, a second case coupled to a first surface of the first case and having a discharge grille disposed on a first side thereof, a support leg disposed on a second side of the second case corresponding to an opposite side of the discharge grille, a third case coupled to a first surface of the second case, and a first panel attached to a first surface of the third case. When the filter assembly, the first case, the second case, the third case, and the first panel are coupled to each other, the air cleaner may have a cylindrical exterior. The discharge grille may extend by a predetermined distance along an upper circumferential surface of the second case.

Abstract: An electrofilter for smoke purification having a set of mutually parallel positive electrodes, which form a number of mutually parallel ducts through which the smoke to be purified can pass and by a set of negative electrodes, which are suspended midway between the collection plates, the collection plates are designed as circular plates mounted at a uniform mutual distance on a rotating shaft, and the discharge wires are suspended from a common frame on which a vibrator is mounted which can vibrate and thus clean the discharge wires of collected dust. On the frame of the electrofilter between each collection plate, stationary scrapers are mounted which bear against each collection plate and clean them of dust.

Abstract: A filtration material comprising a blend of polypropylene and acrylic fibers of round, flat, dog bone, oval or kidney bean shape in any size from 0.08 to 3.3 Dtex. A preferred blend contains about 50 weight percent polypropylene fibers and about 50 weight percent acrylic fibers. The fibers can be blended ranging from 90:10 to 10:90 polypropylene to acrylic. The shape contains 25 weight percent round, flat, oval, dog bone and kidney bean shapes. The fiber blend contains 25 weight percent of at least one size between 0.08 and 3.3 Dtex. Electret fibers incorporated within these blends have 0.02 to 33 weight percent of a charge control agent. These fibers can be used in producing electret material by corona or triboelectric charging methods.

Abstract: An electrostatic particle collector may generally include a housing having sidewalls extending lengthwise between a first end and a second end. The housing may define a plate slot that extends heightwise within the housing between a top end and a bottom end. The housing may further include a plate access window that provides access to the bottom end of the plate slot. The collector may also include a collector plate configured to be installed within the plate slot that extends heightwise between a top edge and a bottom edge. Additionally, when the collector plate is installed within the plate slot, the bottom edge of the collector plate may be accessible from an exterior of the housing via the plate access window so as to allow the bottom edge of the collector plate to be moved relative to the housing to facilitate removal of the collector plate from the housing.

Abstract: The present invention is directed toward an improved air filtration medium comprising a single layer polymeric nanofibrous web comprising a single source randomly intermingled fiber network with electrostatic charge up to ?20 kV, a filtration efficiency range from about 70% to about 99.99%, and an air resistance less than about 2.5 mm wg for 0.3 diameter micron particles. The air filtration medium is made from a centrifugal melt spinning process.

Abstract: The invention provides a gas purification system, for instance for agricultural application comprising a corona discharge system, the corona discharge system comprising a counter electrode, a conductive strip with a longitudinal edge comprising tooth structures, wherein the tooth structures have tooth tops with shortest distances selected from the range of 2-200 mm; and a voltage generator configured to apply a DC voltage of at least 10 kV to the conductive strip.

Abstract: The present invention provides a cleaning device (1) for cleaning the air-ionizing part (4) of an electrode (3), said device comprising a cleaning member (5) arranged to be in physical contact with the said air-ionizing part of said electrode, the air-ionizing part of electrode and the cleaning member being arranged to slide relative to each other. The cleaning device further comprises an actuator (6, 8, 9) arranged to activate the relative motion between said air-ionizing part (4) of the electrode (3) and the cleaning member (5). There is also provided an ionization electrode comprising an air-ionizing part and the cleaning device, as well as a ultrafine particle sensor, an air ionizer or an electrostatic air cleaner comprising such an electrode.

Abstract: An air filtration system includes a frame directing an airflow through the air filtration system and a media filter. The media filter includes a plurality of media fibers arranged to capture particles flowing therethrough and a conductive surface located at the media filter and having a conductivity within a selected range. Two or more contact pads are located at the media filter and are alignable with an electrical circuit located at the frame to determine whether a resistance across the conductive plane is within a selected resistance range. A method of installing a media filter in an air filtration system includes inserting the media filter into a frame of the air filtration system and aligning one or more contact pads of the media filter with one or more grounding pads of the frame. A resistance across the media filter is measured.

Abstract: For the sake of improving dust removal from an electrostatic precipitator by rapping, the present disclosure proposes an electrostatic precipitator, comprising a flue gas chamber, a collecting electrode, a first rapping arrangement that raps the collecting electrode, a dust hopper, and a second rapping arrangement that raps at least one of the dust hopper and an element located within the dust hopper, wherein the second rapping arrangement is located within an inner chamber defined by the flue gas chamber and the dust hopper. The rapping by means of the second rapping arrangement may comprise rapping at least one of an inner wall of the dust hopper, a structural element located within the dust hopper and connected to at least one inner wall of the dust hopper, a rapping plate located within the dust hopper proximate to an inner wall of the dust hopper, and a baffle located within the dust hopper.

Abstract: An air filter cartridge arrangement, an air cleaner assembly, and components therefor, are provided. The air filter cartridge generally has perimeter shape with an arched side. The filter cartridge may include a media pack comprising strips of single facer material, each strip comprising fluted sheet secured to a facing sheet. In an example depicted, arch-shaped sections of single facer material are nested within one another, to form media pack having a perimeter D-shape. An air cleaner assembly configured for receipt of filter cartridge is described. A particular assembly, convenient for mounting on the cowl, cowling or engine cover of an over-the-highway truck, is provided.

Abstract: A method and to a device for the electrostatic separation of fine dust particles from gases that flow through a housing (1) containing perforated plates (6) and electrodes (4, 5). An electric field is created between the electrode (4) on the inflow opening side and the electrode or electrodes (5) having positive polarity on the outflow side. The removal of negatively charged fine dust particles (9) is carried out by deposition on the inflow side of the perforated plates (6), and the removal of positively charged fine dust particles (11) is carried out on the outflow side. Fine dust particles without charge (10) are charged after the last perforated plate (6) in an ionization chamber (8) and deposit on the outflow side of the last perforated plate (6).

Abstract: An air purifier is disclosed having a bubble generator configured to generate fine air bubbles with a diameter of about 50 ?m or less and a negative electrical charge. The bubble generator is coupled to an air purification tank, which contains a liquid for purifying the air within the air bubbles, by dissolving impurities. The tank also has a positive electrode disposed within the liquid. The positive electrode is configured to attract the negatively charged air bubbles, thereby promoting defoaming and increasing the air throughput rate.

Abstract: A method for applying a moisture barrier to a precipitator of cardboard for a two-step electrofilter, wherein the precipitator includes at least two paper bands (5) that constitute electrode elements in the precipitator, which paper bands (5) are multiply wound around a center axis of the precipitator, wherein the paper bands (5) exhibit a thin plastic layer with a thickness of 5-50 micrometers on their lateral surfaces (4), and where proximate electrode elements are arranged at a distance from one another in the radial direction of the precipitator. The method is characterized in that edge parts (6) of the paper bands (5) have a moisture-resistant substance applied to them. The material for fabricating a precipitator of cardboard for a two-step electrofilter is also described.

Abstract: A method and arrangement to improve animal's biological and/or physical performance by reducing the bioload, defined as biologically active particles in the stable air or within transporter vehicles. The method includes generating a negatively charged electrostatic field operating within the room capturing the particles. The arrangement includes elements for producing a negatively charged electrostatic field capturing air borne particulate matter whereby high voltage >6 kV at low amperage (<10 mA) is applied to a basic conductive structure positioned in the air of the stable or the transporter vehicle, to which carbon fiber filaments are attached, causing the release of electrons from the free ending carbon fibers into the air and thereby generating the negatively charged electrostatic field.

Abstract: An air filtration system includes a frame directing an airflow through the air filtration system and a power supply. An ionization array is located in the frame across the airflow and connected to the power supply. The power supply provides a first voltage to the ionization array. A field wire is located in the frame downstream from the ionization array and is energized to a second voltage only by an electrical energy discharge from the ionization array. A method of operating an electrically enhanced air filtration system includes energizing an ionization array, located across an airflow through the air filtration system, to a first voltage via electrical power supplied by a power supply. Electrical energy is discharged from the ionization array into the airflow. A field wire downstream of the ionization array is energized to a second voltage only by the discharge of electrical energy from the ionization array.

Abstract: An HVAC system having an air cleaner, a fan configured to selectively generate an air flow, wherein at least a portion of the air flow is passed through the air cleaner, and a controller configured to control the air cleaner in response to at least one of a setting for controlling the fan and an operation characteristic of the fan is disclosed.

Abstract: A device for treating a gas stream, especially an exhaust-gas stream of an internal combustion engine, includes at least one radial chamber radially conducting the gas stream and extending substantially radially from a central region to an outer collecting chamber. First and second, preferably parallel, substantially disk-shaped walls delimit the chamber. Electrodes project from the first wall into the chamber. The first wall is formed of electrically insulating material having the electrodes fastened therein and electrically interconnected by electrical conductors in or on the insulating material. Two or more chambers may be disposed, axially in series, around the central region. Very effective treatment of exhaust gas with an electric field for ionization or generating a plasma can be provided over a relatively short structural length in a flow direction. Electric fields running transversely to the flow direction provide new possibilities for selecting various parameters of the treatment device.