Dust collector

• US 5,902,380 A
• Filed: 05/23/1997
• Issued: 05/11/1999
• Est. Priority Date: 05/23/1996
• Status: Expired due to Term

• Current Assignee: Mitsubishi Hitachi Power Systems Environmental Solutions Ltd (Mitsubishi Heavy Industries, Ltd.)
• Original Assignee: Mitsubishi Heavy Industries, Ltd.
• Inventors: Ueda, Yasutoshi, Tomimatsu, Kazutaka
• Primary Examiner(s): Chiesa, Richard L.
• Application Number:
  US08/862,268
• Time in Patent Office: 718 Days
• Field of Search: 96/27, 96/52, 96/53, 96/74, 96/66, 96/69, 96/87, 95/58, 95/61, 95/62, 95/71, 95/72, 95/64-66
• US Class Current: 96/27
• CPC Class Codes: B01D 53/504 characterised by a specific device
• CPC Class Codes: B03C 3/145 Inertia
• CPC Class Codes: B03C 3/155 Filtration
• CPC Class Codes: B03C 3/16 wet type

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.

Claims

1. A dust collector for removing at least one of dust and mist from a gas, comprising:

a charger for electrically charging at least one of dust and mist contained in a gas;

a sprayer without charging means therein, located apart and downstream from the charger in a flow of the gas that sprays an uncharged dielectric material to at least one of charged dust and charged mist;

an electric field former that forms an electric field which subjects said uncharged dielectric material to dielectric polarization; and

a collector for collecting said dielectric material which has arrested at least one of charged dust and charged mist.

2. A dust collector according to claim 1, wherein said electric field former has parallel plate electrodes for forming at least one of a d.c. electric field and an alternating electric field.

3. A dust collector according to claim 1, wherein said collector comprises at least one of an electric dust collector and a mechanical dust collector.

4. A dust collector according to claim 1, wherein said electric field former has a plurality of grounding electrodes and voltage applying electrodes for forming at least one of a d.c. electric field and an alternating electric field, said grounding electrodes are adjacent said voltage applying electrodes, the lower part of said grounding electrode is covered with a cover having the same electric potential as that of the grounding electrode, and the lower part of said voltage applying electrode is covered with a cover having the same electric potential as that of the voltage applying electrode.

5. A dust collector comprising:

a cooler for cooling a gas to form a mist of a gas component to be removed from said gas;

a charger for electrically charging said mist;

a sprayer without charging means therein, located apart and downstream from the charger in a flow of the gas that sprays an uncharged dielectric material to the charged mist;

an electric field former that forms an electric field which subjects said uncharged dielectric material to dielectric polarization; and

a collector for collecting said dielectric material which has arrested the charged mist.

6. A dust collector according to claim 5, wherein said electric field former has parallel plate electrodes for forming at least one of a d.c. electric field and an alternating electric field.

7. A dust collector according to claim 5, wherein said collector comprises at least one of an electric dust collector and a mechanical dust collector.

8. A dust collector according to claim 5, wherein said electric field former has a plurality of grounding electrodes and voltage applying electrodes for forming at least one of a d.c. electric field and an alternating electric field, said grounding electrodes are adjacent said voltage applying electrodes, the lower part of said grounding electrode is covered with a cover having the same electric potential as that of the grounding electrode, and the lower part of said voltage applying electrode is covered with a cover having the same electric potential as that of the voltage applying electrode.

9. A dust collector for removing at least one of a dust and a mist from a gas, comprising:

a charger for electrically charging at least one of dust and mist contained in a gas;

a sprayer without charging means therein, located apart and downstream from the charger in a flow of the gas that sprays an uncharged dielectric material to at least one of the charged dust and the charged mist;

an electric field former that forms an electric field which subjects said uncharged dielectric material to dielectric polarization; and

a porous, non-conductive member for holding the dielectric material, said member being arranged to block the travel path of said dielectric material in said electric field.

10. A dust collector according to claim 9, wherein said dielectric material holding member is arranged in said electric field to block an inlet of said electric field.

11. A dust collector according to claim 9, wherein said porous, non-conductive member is a mesh-form non-conductive member.