An electrostatic precipitator is constructed with collecting and repelling electrodes. The collecting electrode is partially shielded from gas shear forces by a shielding structure. The shielding structure is mounted to reduce gas flow along a surface of the collector and includes passages for charged particles to travel to be captured by the collector.

A thermal power plant exhaust purification device, the device including a cooling substance flow channel and an exhaust flow channel; the device also includes a spacing member for spacing and exchanging heat between the cooling substance flow channel and the exhaust flow channel, the spacing member having an exhaust contact surface for collecting dust and/or mist contained in the exhaust; the cooling substance flows in the cooling substance flow channel, such that the condensate precipitated from hot exhaust uniformly adheres on the exhaust contact surface, thus forming a uniform and stable water film; on one hand, formation of the concentrated H.sub.2SO.sub.4 on a dust collecting plate is prevented, and a liquid film flows downwards under gravity, thereby cleaning the H.sub.2SO.sub.4 adhered on the dust collecting plate timely; on the other hand, the water film is very effective in intercepting droplets and capturing the dust.

A filtration system includes a frame directing a fluid flow through the filtration system. An ionization array is located in the frame and has an ionizer current flowing therethrough. The system further includes a media filter having a plurality of media fibers arranged to capture particles flowing therethrough and a conductive surface located at the media filter and having a filter current flowing therethrough. A comparator is utilized to determine a difference between the ionizer current and the filter current, and compare that difference to a predetermined range.

A filtration system includes a frame directing a fluid flow through the filtration system. An ionization array is located in the frame and has an ionizer current flowing therethrough. The system further includes a media filter having a plurality of media fibers arranged to capture particles flowing therethrough and a conductive surface located at the media filter and having a filter current flowing therethrough. A comparator is utilized to determine a difference between the ionizer current and the filter current, and compare that difference to a predetermined range.

An electric dust collecting device and an air conditioner having the same are disclosed. The electric dust collecting device includes a first filter unit including a plurality of discharge electrode plates which are spaced apart from each other and have spaces defined therebetween, a high voltage generator electrically connected to all of the plurality of discharge electrode plates, and a second filter unit disposed downstream of the first filter unit in an air flow direction and connected to a ground to cause corona discharge between the discharge electrode plates and the second filter unit, whereby particles electrically charged by corona discharge are collected at the second filter unit. The first filter unit has a simplified structure, and cleaning effect is improved.

An electric dust collecting device and an air conditioner having the same are disclosed. The electric dust collecting device includes a first filter unit including a plurality of discharge electrode plates which are spaced apart from each other and have spaces defined therebetween, a high voltage generator electrically connected to all of the plurality of discharge electrode plates, and a second filter unit disposed downstream of the first filter unit in an air flow direction and connected to a ground to cause corona discharge between the discharge electrode plates and the second filter unit, whereby particles electrically charged by corona discharge are collected at the second filter unit. The first filter unit has a simplified structure, and cleaning effect is improved.

A dust collecting module for reducing vibration by maintaining a distance between electrodes includes an arrangement of discharge electrodes and dust collecting electrodes alternately disposed and spaced apart from each other, the discharge electrodes configured to be charged to a predetermined voltage for generating a corona discharge between the discharge electrodes and the dust collecting electrodes, at least one dust collecting electrode of the dust collecting electrodes having a first hole; a first hole jig received in the first hole and fixed to the at least one dust collecting electrode, the first hole jig having a larger thickness than the at least one dust collecting electrode; a first tie rod coupled to the discharge electrodes and configured to pass through and fix the discharge electrodes by being fitted into the first hole jig; and a second tie rod coupled to the dust collecting electrodes to fix the dust collecting electrodes.

A dust collecting module for reducing vibration by maintaining a distance between electrodes includes an arrangement of discharge electrodes and dust collecting electrodes alternately disposed and spaced apart from each other, the discharge electrodes configured to be charged to a predetermined voltage for generating a corona discharge between the discharge electrodes and the dust collecting electrodes, at least one dust collecting electrode of the dust collecting electrodes having a first hole; a first hole jig received in the first hole and fixed to the at least one dust collecting electrode, the first hole jig having a larger thickness than the at least one dust collecting electrode; a first tie rod coupled to the discharge electrodes and configured to pass through and fix the discharge electrodes by being fitted into the first hole jig; and a second tie rod coupled to the dust collecting electrodes to fix the dust collecting electrodes.

Provided is an electrostatic dust filter including a frame that is opened back and forth and forms a space through which air passes, a chemical absorbent that is accommodated in the space and absorbs harmful substance in the air, a mesh member that covers the front of the frame and has a plurality of pores through which the air passes, a ground electrode that covers the rear of the frame and has the plurality of pores through which the air passes, and is grounded, and a voltage electrode that is disposed to opposite to the ground electrode with respect to the mesh member and applied with a high voltage.

Provided is an electrostatic dust filter including a frame that is opened back and forth and forms a space through which air passes, a chemical absorbent that is accommodated in the space and absorbs harmful substance in the air, a mesh member that covers the front of the frame and has a plurality of pores through which the air passes, a ground electrode that covers the rear of the frame and has the plurality of pores through which the air passes, and is grounded, and a voltage electrode that is disposed to opposite to the ground electrode with respect to the mesh member and applied with a high voltage.