An air filtering device is provided, including: a plurality of metal nets, arranged in interval in a filtering path, respectively connected to a pole of at least one high-voltage power source to provide electric fields, adjacent two of the plurality of metal nets having opposite polarities; wherein at least one of the plurality of metal nets is of an electric characteristic which is time-variant relative to a constant reference level so that the electric field of the at least one of the plurality of metal nets is time-variant.

In a method and device for separating components in a corona discharge zone an air stream containing water molecules is passed between at least one ionizing electrode and at least one non-ionizing electrode; and high voltage is applied to the electrodes to create a corona discharge zone consisting of a plasma region wherein ozone is formed and a dark region where predominantly hydrogen peroxide is formed. The air flow entering the corona discharge zone is divided into two separate air flows, a first of which passes through the corona discharge plasma region, and a second of which passes through the dark corona discharge region; and a negative pressure gradient is applied to the plasma region only so as to remove the ozone and thereby separate the ozone from the hydrogen peroxide.

A vehicle dust removing apparatus includes an acquisition unit configured to acquire a temperature of an object to be processed of a vehicle that runs in a low-temperature environment, a temperature of the object to be processed being configured to be able to be increased, a dust removing unit configured to be able to reduce a temperature of gas to be sprayed to the object to be processed and remove dust by spraying gas to the object to be processed, and a control unit configured to control spraying of the gas by the dust removing unit by at least one of increasing the temperature of the object to be processed and reducing the temperature of the gas based on the temperature of the object to be processed, acquired by the acquisition unit.

A vehicle dust removing apparatus includes an acquisition unit configured to acquire a temperature of an object to be processed of a vehicle that runs in a low-temperature environment, a temperature of the object to be processed being configured to be able to be increased, a dust removing unit configured to be able to reduce a temperature of gas to be sprayed to the object to be processed and remove dust by spraying gas to the object to be processed, and a control unit configured to control spraying of the gas by the dust removing unit by at least one of increasing the temperature of the object to be processed and reducing the temperature of the gas based on the temperature of the object to be processed, acquired by the acquisition unit.

A wet-type electric dust collection device and low-concentration SO.sub.3 mist containing, in which the wet-type electric dust collection device has an electrical field formation part in which a plurality of discharge electrodes are provided on opposing surfaces of a first electrode and second electrodes for forming a DC electrical field. The discharge electrodes of the first electrode and the discharge electrodes of the second electrodes generate corona discharges that are reversed in polarity relative to each other. The gas containing the SO.sub.3 mist and the dust is guided to the electrical field formation part without electrically charging the SO.sub.3 mist and the dust or spraying a dielectric in the gas, and while the gas flows between the electrodes, the corona discharges impart electric charges of alternately reversed polarity to the SO.sub.3 mist and the dust. The first electrode and the second electrodes collect the charged SO.sub.3 mist and dust.

A wet-type electric dust collection device and low-concentration SO.sub.3 mist containing, in which the wet-type electric dust collection device has an electrical field formation part in which a plurality of discharge electrodes are provided on opposing surfaces of a first electrode and second electrodes for forming a DC electrical field. The discharge electrodes of the first electrode and the discharge electrodes of the second electrodes generate corona discharges that are reversed in polarity relative to each other. The gas containing the SO.sub.3 mist and the dust is guided to the electrical field formation part without electrically charging the SO.sub.3 mist and the dust or spraying a dielectric in the gas, and while the gas flows between the electrodes, the corona discharges impart electric charges of alternately reversed polarity to the SO.sub.3 mist and the dust. The first electrode and the second electrodes collect the charged SO.sub.3 mist and dust.

Provided is a solvent separation method and a solvent separation apparatus in which a vaporized solvent is collected at one internal side of a solvent separation unit by attracting the vaporized solvent based on electric field, while the vaporized solvent is prevented from coming into contact with electrodes, and the collected solvent is discharged from the solvent separation unit. Different electric fields are alternately applied to a pair of first electrodes and a pair of second electrodes present at predetermined locations inside a tetragonal tubular solvent separation unit to attract a vaporized solvent toward the second electrodes. Thus, the vaporized solvent is collected in a space between the second electrodes inside the solvent separation unit, and the collected solvent is discharged from the solvent separation unit, together with a portion of the exhaust atmosphere present around the collected solvent.

Provided is a solvent separation method and a solvent separation apparatus in which a vaporized solvent is collected at one internal side of a solvent separation unit by attracting the vaporized solvent based on electric field, while the vaporized solvent is prevented from coming into contact with electrodes, and the collected solvent is discharged from the solvent separation unit. Different electric fields are alternately applied to a pair of first electrodes and a pair of second electrodes present at predetermined locations inside a tetragonal tubular solvent separation unit to attract a vaporized solvent toward the second electrodes. Thus, the vaporized solvent is collected in a space between the second electrodes inside the solvent separation unit, and the collected solvent is discharged from the solvent separation unit, together with a portion of the exhaust atmosphere present around the collected solvent.

An air conditioning apparatus according to an aspect of the present invention includes a main body including a suction part through which air is suctioned and a discharge part through which the air suctioned through the suction part is discharged, a fan disposed in the main body to allow the air to flow, an electric charge device coupled to the main body outside the main body to charge dust in the air, and a filter device disposed between the suction part and the discharge part in the main body to collect the charged dust particles.

An air conditioning apparatus according to an aspect of the present invention includes a main body including a suction part through which air is suctioned and a discharge part through which the air suctioned through the suction part is discharged, a fan disposed in the main body to allow the air to flow, an electric charge device coupled to the main body outside the main body to charge dust in the air, and a filter device disposed between the suction part and the discharge part in the main body to collect the charged dust particles.