US3844205A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilation method and apparatus with dust collection by electric static precipitator
Assignee: Trinity Industrial Corp
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Filing: 1972-10-25
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Granted: 1974-10-29
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Expires: 1992-10-25
Abstract
Abstract A method for electrostatic dust collection which comprises introducing a dust particle- or mist-containing high temperature gas formed in the lower portion of a building into a dustcollecting passage provided with a charging electrode and a dustcollecting electrode face, said dust-collecting passage being formed in a ventilating chamber provided in the upper portion of the building and connected with both a suction port mounted at the lower end of said ventilating chamber and an exhaust port mounted on a roof or side wall of said ventilating chamber; forwarding said dust particle or mist-containing high temperature gas through said dust-collecting passage in which an electrostatic field is formed, along said charging electrode and substantially in parallel thereto; thus catching dust particles or mists contained in the gas on the dust-collecting electrode face; and discharging the gas into the exterior of the ventilating chamber, and apparatus therefor.
Inventors
- 👤 T Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:17
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/02; B03C3/04; B03C3/12; Y; Y10; Y10S; Y10S55/00; Y10S55/29
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
174 words
A method for electrostatic dust collection which comprises introducing a particulate contaminant-containing high temperature gas formed in the lower portion of a building into a dustcollecting passage provided with a charging electrode of a fine wire form and a dust-collecting electrode face confronting to said charging electrode, said dust-collecting passage being formed in a ventilating chamber provided in the upper portion of the building and connected with a suction port mounted at the lower end of said ventilating chamber and an exhaust port mounted on a roof or side wall of said ventilating chamber; forwarding said particulate contaminant-containing high temperature gas through said dust-collecting passage in which an electrostatic field is formed between said charging electrode of a fine wire form and said dust-collecting electrode face, along said charging electrode of a fine wire form and substantially in parallel thereto; thus catching particulate contaminants contained in the high temperature gas on the dust-collecting electrode face; and discharging the gas from which particulate contaminants have been substantially removed, into the exterior of the ventilating chamber.
Claim 2
Independent Claim
174 words
A method for electrostatic dust collection which comprises introducing a particulate contaminant-containing high temperature gas formed in the lower portion of a building into a dustcollecting passage provided with a charging electrode of a fine wire form and a dust-collecting electrode face confronting to said charging electrode, said dust-collecting passage being formed in a ventilating chamber provided in the upper portion of the building and connected with a suction port mounted at the lower end of said ventilating chamber and an exhaust port mounted on a roof or side wall of said ventilating chamber; forwarding said particulate contaminant-containing high temperature gas through said dust-collecting passage in which an electrostatic field is formed between said charging electrode of a fine wire form and said dust-collecting electrode face, along said charging electrode of a fine wire form and substantially in parallel thereto; thus catching particulate contaminants contained in the high temperature gas on the dust-collecting electrode face; and discharging the gas from which particulate contaminants have been substantially removed, into the exterior of the ventilating chamber.
Claim 3
Dependent Claim
58 words
A method set forth in claim 1 wherein the average field intensity in said dust-collecting passage is within a range of from 1.0 to 2.5 KV/cm and the particulate contaminant-contaIning high temperature gas is allowed to pass through said dust-collecting passage so that the residence time of the gas in the dust-collecting passage is at least 5 seconds.
Claim 4
Dependent Claim
44 words
A method set forth in claim 1 wherein the particulate contaminant-containing high temperature gas is allowed to pass through said dust-collecting passage so that the linear velocity of the gas in the dust-collecting passage is within a range of from 0.3 to 3 m/sec.
Claim 5
Dependent Claim
29 words
A method set forth in claim 1 wherein the particulate contaminant-containing gas is introduced into said dust-collecting passage in the form of an upward current owing to natural convention.
Claim 6
Independent Claim
210 words
A method for dust collection in a casting house which comprises projecting a gas upwardly from a gas projection opening which is provided on the floor of the casting house to surround the exposed portion of a tap hole portion and iron running; allowing an iron oxide fume formed from molten pig iron passing through the tap hole portion and iron running to move upwardly in a space wrapped with an upward current of the gas projected from the gas projection opening; introducing the rising iron oxide fume into a dust-collecting passage provided with a charging electrode of a fine wire form and a dust-collecting electrode face confronting to said charging electrode, said dust-collecting passage being formed in a ventilating chamber provided in the upper portion of a building of the casting house; forwarding said iron oxide fume through said dust-collecting passage in which an electrostatic field is formed between said charging electrode of a fine wire form and said dust-collecting electrode face, along said charging electrode of a fine wire form and substantially in parallel thereto; thus catching dust particles of iron oxide on the dust-collecting electrode face; and discharging the gas from which dust particles of iron oxide have been substantially removed, into the exterior of the building.
Claim 7
Independent Claim
210 words
A method for dust collection in a casting house which comprises projecting a gas upwardly from a gas projection opening which is provided on the floor of the casting house to surround the exposed portion of a tap hole portion and iron running; allowing an iron oxide fume formed from molten pig iron passing through the tap hole portion and iron running to move upwardly in a space wrapped with an upward current of the gas projected from the gas projection opening; introducing the rising iron oxide fume into a dust-collecting passage provided with a charging electrode of a fine wire form and a dust-collecting electrode face confronting to said charging electrode, said dust-collecting passage being formed in a ventilating chamber provided in the upper portion of a building of the casting house; forwarding said iron oxide fume through said dust-collecting passage in which an electrostatic field is formed between said charging electrode of a fine wire form and said dust-collecting electrode face, along said charging electrode of a fine wire form and substantially in parallel thereto; thus catching dust particles of iron oxide on the dust-collecting electrode face; and discharging the gas from which dust particles of iron oxide have been substantially removed, into the exterior of the building.
Claim 8
Dependent Claim
189 words
Apparatus for electrostatic dust collection which comprises a working area provided in the lower portion of a building in which a particulate contaminant-containing high temperature gas is formed; a ventilating chamber provided in the upper portion of the building, said ventilating chamber being connected with said working area through a suction port mounted at the lower end of the ventilating chamber and opened to the open air through an exhaust port mounted on a roof or side wall of the ventilating chamber; and a dust-collecting passage formed in said ventilating chamber and composed of a charging electrode of a fine wire form supported by an insulating member and a dust-collecting electrode face confronting to said charging electrode, an electrostatic field being formed between said charging electrode and said dust-collecting electrode face; said dust-collecting passage having such a length that the residence time of the particulate contaminant-containing gas passing through the inside of the dust-collecting passage by natural convention is at least 5 seconds and said charging electrode of a fine wire form being laid along the direction of the advance of the particulate contaminant-containing gas in the dust-collecting passage.
Claim 9
Dependent Claim
189 words
Apparatus for electrostatic dust collection which comprises a working area provided in the lower portion of a building in which a particulate contaminant-containing high temperature gas is formed; a ventilating chamber provided in the upper portion of the building, said ventilating chamber being connected with said working area through a suction port mounted at the lower end of the ventilating chamber and opened to the open air through an exhaust port mounted on a roof or side wall of the ventilating chamber; and a dust-collecting passage formed in said ventilating chamber and composed of a charging electrode of a fine wire form supported by an insulating member and a dust-collecting electrode face confronting to said charging electrode, an electrostatic field being formed between said charging electrode and said dust-collecting electrode face; said dust-collecting passage having such a length that the residence time of the particulate contaminant-containing gas passing through the inside of the dust-collecting passage by natural convention is at least 5 seconds and said charging electrode of a fine wire form being laid along the direction of the advance of the particulate contaminant-containing gas in the dust-collecting passage.
Claim 10
Dependent Claim
24 words
The apparatus of claim 6 wherein said charging electrode is composed of an electrically conductive fine wire having a diameter not exceeding 1 mm.
Claim 11
Dependent Claim
65 words
The apparatus of claim 6 wherein a gas exhaust port is mounted on the side wall of the ventilating chamber on which the insulating member is fixed, and a cylindrical guide is mounted to surround said gas exhaust port and said insulating member, whereby particulate contaminants depositing on said insulating member is wiped away by a gas current flowing out of said gas exhaust port.
Claim 12
Dependent Claim
39 words
The apparatus of claim 6 wherein the length of said dust-collecting passage is sufficient to provide a residence time of particulate contaminant-containing gas passing through the inside of said dust-collecting passage by natural convention to at least 10 secoNds.
Claim 13
Dependent Claim
53 words
The apparatus of claim 6 wherein the dust-collecting electrode comprises a plate member having a surface for forming a water film layer thereon, a water feed mechanism for feeding a water current downwardly on said plate member, and a recovery tank for receiving the water current having flown downwardly on the plate member.
Claim 14
Dependent Claim
67 words
The apparatus of claim 6 wherein said insulating member has an end portion supporting movably the charging electrode of a fine wire form, and said charging electrode of a fine wire form is travelled during the dust-collecting operation from a reel for unwinding said charging electrode of a fine wire form toward a reel for winding said charging electrode through said end portion of the insulating member.
Claim 15
Dependent Claim
24 words
The apparatus of claim 11 wherein the charging electrode of a fine wire form is travelled at a rate of 50 to 5000 mm/min.
Claim 16
Dependent Claim
173 words
Apparatus for dust collection in casting houses, which comprises a casting house provided with a tap hole portion and an iron running connected with said tap hole portion; a gas projection opening provided in the vicinity of side walls of the exposed portion of the tap hole portion and iron running; and a dust-collecting passage formed in a ventilating chamber provided in the upper portion of a building of the casting house and composed of a charging electrode of a fine wire form and a dust-collecting electrode face confronting to said charging electrode, and electrostatic field being formed between said charging electrode and said dust-collecting electrode face; said gas projection opening and dust-collecting passage being disposed in such a positional relationship that an iron oxide fume formed from molten pig iron passing through said tap hole portion and iron running rises in a space formed by an upward current of a gas projected from said gas projection opening and the iron oxide fume rising in said space is introduced into said dust-collecting passage.
Claim 17
Dependent Claim
173 words
Apparatus for dust collection in casting houses, which comprises a casting house provided with a tap hole portion and an iron running connected with said tap hole portion; a gas projection opening provided in the vicinity of side walls of the exposed portion of the tap hole portion and iron running; and a dust-collecting passage formed in a ventilating chamber provided in the upper portion of a building of the casting house and composed of a charging electrode of a fine wire form and a dust-collecting electrode face confronting to said charging electrode, and electrostatic field being formed between said charging electrode and said dust-collecting electrode face; said gas projection opening and dust-collecting passage being disposed in such a positional relationship that an iron oxide fume formed from molten pig iron passing through said tap hole portion and iron running rises in a space formed by an upward current of a gas projected from said gas projection opening and the iron oxide fume rising in said space is introduced into said dust-collecting passage.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |