Abstract: An air purification device including a flow passage through which air circulates; an electrical precipitator unit that is disposed in the flow passage and that includes a discharge electrode having a body unit and a corona discharge unit for corona discharge which protrudes from the body unit, and a collecting electrode disposed opposing the discharge electrode; an ozone removal unit that is disposed in the flow passage, and that is capable of removing ozone included in the circulating air, and a control unit that switches between a first mode in which air from which ozone has been removed is supplied from a downstream section of the flow passage to the outside, and a second mode in which air including ozone is supplied from the downstream section of the flow passage to the outside.

Abstract: An air-conditioning apparatus including an electrical precipitator part that has an electric discharge electrode having a body portion and corona discharge portions being for corona discharge and protruding from the body portion, and a collecting electrode that is provided opposite the electric discharge electrode, and an medium-efficiency particulate air filter part that is provided downstream of the electrical precipitator part , wherein the collecting electrode is a plate-shaped member, a plate surface thereof is provided parallel to a gas flow direction, and the corona discharge portion has a first corona discharge section that protrudes from the body portion at one side end of the body portion, upstream in the gas flow direction, and a second corona discharge section that protrudes from the body portion at the other side end of the body portion, downstream in the gas flow direction.

Abstract: An electrostatic precipitator is provided capable of preventing a reduction in dust collection effect of ionic wind, and increasing dust collection efficiency. The electrostatic precipitator includes: a plurality of collecting electrodes (4) in the form of circular pipes arranged at predetermined intervals in a direction orthogonal to a longitudinal direction of the electrodes; and a plurality of protrusions (5a) protruding toward the collecting electrodes (4) and arranged offset in parallel with the orthogonal direction. An equivalent diameter of a cross section of the collecting electrode (4) is 30 mm to 80 mm. An opening ratio of the collecting electrodes (4) arranged at predetermined intervals is 10% to 70%.

Abstract: An electrostatic precipitator includes a collecting electrode provided along a gas flow direction, including a plurality of openings being formed in the collecting electrode, and a discharge electrode arranged in parallel with the collecting electrode. The discharge electrode includes a plurality of corona discharge portions for corona discharge, the plurality of corona discharge portions are continuously provided in the gas flow direction, and are protruding toward only one collecting electrode of the collecting electrodes that face each other. A plurality of collecting electrodes and a plurality of discharge electrodes are alternately arranged in a direction orthogonal to a gas flow direction. In each of the upstream region and the downstream region in the gas flow direction, all of the corona discharge portions protrude in the same direction.

Abstract: An electrostatic precipitator is provided capable of preventing a reduction in dust collection effect of ionic wind, and increasing dust collection efficiency. The electrostatic precipitator includes: a plurality of collecting electrodes (4) in the form of circular pipes arranged at predetermined intervals in a direction orthogonal to a longitudinal direction of the electrodes; and a plurality of protrusions (5a) protruding toward the collecting electrodes (4) and arranged offset in parallel with the orthogonal direction. An equivalent diameter of a cross section of the collecting electrode (4) is 30 mm to 80 mm. An opening ratio of the collecting electrodes (4) arranged at predetermined intervals is 10% to 70%.

Abstract: A dust collection system, a dust collection method, and a dust collector, can enhance dust-collecting efficiency while reducing the volume of the dust collector as a whole. A dust collector is provided with a casing having an inlet into which gas is introduced; a discharge electrode to which voltage is applied, the discharge electrode being disposed inside the casing and having a spike called discharge spike and mounting frames for supporting the discharge spike; and a collecting electrode having a planar member, disposed inside the casing facing the discharge electrode, the mounting frames being inclined with relation to the gas flow at the inlet. Two mounting frames are connected to each other on the downstream side of the gas flow, and are arranged so that, between the two mounting frames, the upstream side of the gas flow is wider than the downstream side of the gas flow.

Abstract: The purpose of the present invention is to provide a dust collector, an electrode selection method for a dust collector, and a dust collection method such that it is possible to select a suitable wire mesh to be used in a collecting electrode and thereby improve the collecting efficiency even at high flow velocities. A dust collector has a discharge electrode to which a voltage is applied, and a collecting electrode that is disposed facing the discharge electrode and has a planar member formed of a wire mesh, wherein the wire mesh of the planar member satisfies equations <1> and <2> below, and the gas face velocity (v) of the gas penetrating the wire mesh is v=0.1 m/s or higher. <1> IndexT=(the inter-wire distance÷2)÷the opening ratio÷the wire diameter×the gas face velocity <2> IndexT?2.

Abstract: A dust collection system, a dust collection method, and a dust collector, can enhance dust-collecting efficiency while reducing the volume of the dust collector as a whole. A dust collector is provided with a casing having an inlet into which gas is introduced; a discharge electrode to which voltage is applied, the discharge electrode being disposed inside the casing and having a spike called discharge spike and mounting frames for supporting the discharge spike; and a collecting electrode having a planar member, disposed inside the casing facing the discharge electrode, the mounting frames being inclined with relation to the gas flow at the inlet. Two mounting frames are connected to each other on the downstream side of the gas flow, and are arranged so that, between the two mounting frames, the upstream side of the gas flow is wider than the downstream side of the gas flow.

Abstract: The purpose of the present invention is to provide a dust collector, an electrode selection method for a dust collector, and a dust collection method such that it is possible to select a suitable wire mesh to be used in a collecting electrode and thereby improve the collecting efficiency even at high flow velocities. A dust collector has a discharge electrode to which a voltage is applied, and a collecting electrode that is disposed facing the discharge electrode and has a planar member formed of a wire mesh, wherein the wire mesh of the planar member satisfies equations <1> and <2> below, and the gas face velocity (v) of the gas penetrating the wire mesh is v=0.1 m/s or higher.

Abstract: A method for operating a dust collection device by reducing the adhesion of high-resistance dust while performing stable charging, with minimal pressure loss and high efficiency. The dust collection device comprises a pre-charging unit and a bag filter in a flue gas duct through which a gas flows, with the pre-charging unit disposed upstream from the bag filter, wherein the pre-charging unit comprises electrodes that charge the dust, a power source that supplies electric power to the electrodes, and a gas flow rate control device that adjusts the flow rate of the gas flowing through the pre-charging unit to a prescribed value. The method comprises a step of charging the dust by applying a voltage from the electrodes to the dust, and a step of removing the dust adhered to the electrodes by increasing the flow rate of the gas flowing through the pre-charging unit.

Abstract: An apparatus, which collects particulate matter contained in a gas flowing through a flow path formed in a cylindrical shape having an outer surface and an inner surface, includes: an outer shell that forms the outer surface of the flow path; a ground electrode that forms the inner surface of the flow path; a filter layer that is arranged between the outer shell and the ground electrode; and a discharge electrode that generates, when a voltage is applied, an ion wind inducing a secondary flow toward the ground electrode in a direction transverse to the flow path. The secondary flow passes through the ground electrode and the filter layer having a predetermined aperture ratio.

Abstract: In a dust collecting apparatus, a flow path (8) through which a gas containing particulate matter flows is formed by arranging a ground electrode (5) in an outer shell (2), a dust-collecting filter layer (6) is arranged adjacent to one side of the ground electrode (5), and a plurality of discharge units (4) of a discharge electrode, to which a voltage is applied to generate an ion wind inducing and forming a secondary flow with respect to the gas, is arranged on the other side of the ground electrode (5), with tips (4a) thereof being away from each other in a direction transverse to the flow path (8).

Abstract: A dust collector for collecting dust, in which the rarefaction of a dielectric at the rear part of electric field forming apparatus is prevented, whereby the collecting efficiency can be increased. The dust collector includes a charging device for charging a substance to be collected, such as dust and mist, contained in a gas; a sprayer device for spraying a dielectric on the substance to be collected which is charged by the charging device; an electric field forming device, having first and second electrodes and which form a direct current electric field and dielectrically polarize the dielectric sprayed by the spray device; and a dielectric collecting device for collecting the dielectric which has arrested the substance to be collected. The spray device includes grounding device and for electrically grounding the dielectric before being sprayed to let a charge of the dielectric escape.

Abstract: There are provided a dust collector and method for collecting dust in which the rarefaction of a dielectric at the rear part of electric field forming means is prevented, whereby the collecting efficiency can be increased.

Abstract: There are provided a dust collector and method for collecting dust in which the rarefaction of a dielectric at the rear part of electric field forming means is prevented, whereby the collecting efficiency can be increased.

Abstract: A dust collector for collecting dust, in which the rarefaction of a dielectric at the rear part of electric field forming apparatus is prevented, whereby the collecting efficiency can be increased. The dust collector includes a charging device (1) for charging a substance (9) to be collected, such as dust and mist, contained in a gas; a sprayer device (2) for spraying a dielectric (10) on the substance (9) to be collected which is charged by the charging device (1); an electric field forming device (3), having first and second electrodes (11) and (12) which form a direct current electric field and dielectrically polarize the dielectric (10) sprayed by the spray device (2); and a dielectric collecting device (16) for collecting the dielectric (10) which has arrested the substance (9) to be collected. The spray device (2) includes grounding device (17) and (18) for electrically grounding the dielectric (10) before being sprayed to let a charge of the dielectric (10) escape.

Abstract: A dust collector efficiently collects dust, especially fine dust (submicron particles). The dust collector, which removes dust and/or mist contained in a gas, includes a charger for charging the dust and/or mist contained in a gas, a sprayer for spraying the charged dust or charged mist or spraying a dielectric material to the charged dust or mist, an electric field former for forming an electric field for subjecting the dielectric material to dielectric polarization, and a collector for collecting the dielectric material which has arrested the charged dust and/or the charged mist.

Abstract: A pulse charging apparatus includes a DC high-voltage generator, a capacitor that is charged by a DC high voltage output from the DC high-voltage generator, a switching unit for switching charges stored on the capacitor to provide a pulse-like high voltage to a load, and a control unit for controlling the operation of the switching unit. The switching unit consists of a series combination of an electron tube and a stationary gap. The control unit controls the operation of the electron tube.

Abstract: A self-discharge type pulse charging electrostatic precipitator includes a high-speed switching element through which the electrical charge stored in a condenser is suddenly supplied to the electrostatic precipitator and the charge is dissipated in an internal resistance in the precipitator. A charging section of the electrostatic precipitator for one power source is divided into a plurality of charging sections which are coupled with each other through inductive elements. The electrostatic precipitator includes a device for supplying the electrical charge to each of the divided charging sections through the high-speed switching element successively in a time sharing manner and a charging capacitor having a capacitance which is substantially equal to a capacitance of the divided charging section. The electrostatic precipitator possesses enhanced precipitation efficiency by suppressing the back ionization and realizes reduction in cost of the power source.

Abstract: An impulse high voltage generator includes a step-up transformer for stepping up a voltage from an AC power source, a thyristor connected with a primary winding of the transformer for controlling the AC voltage from the AC power source by a firing angle, a full-wave rectifier and a capacitor which are connected with a secondary winding of the transformer, and a discharging resistor connected through a high-speed switching element to the secondary winding. The thyristor is turned on at a firing angle in accordance with a frequency which is set by a setting device for setting an impulse high voltage occurence frequency so that the capacitor is charged, while when the thyristor is turned off, the high-speed switching element is turned on to discharge the capacitor so that an impulse high voltage is generated across the discharging resistor. The impulse high voltage generator can vary a peak value and the occurrence frequency of the impulse high voltage simply and inexpensively with high efficiency.