Patent US3965829A successfully refreshed from Google Patents.
US3965829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boiler
Assignee: BP PLC
•
Filing: 1975-02-03
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Granted: 1976-06-29
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Expires: 1995-02-03
Abstract
Abstract An oil fired heating plant has a boiler and a cyclone for trapping flue dust. The flue dust is continually recirculated from the cyclone back to the boiler by, for example, a fan. The recirculated flue dust is passed into the primary air supply of the oil burner being used in the boiler.
Inventors
- 👤 Byrom Lees
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:31
CPC Classifications
F; F23; F23C; F23C9/00; F23C9/06; F23J; F23J15/00; F23J15/02; F23J15/022; F23J15/027; F23L; F23L5/00; F23B; F23B2700/00; F23B2700/023
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
55 words
An oil-fired heating plant comprising a combustion chamber, an oil burner having a combustion air inlet, said oil burner being located in said combustion chamber, a cyclone means for trapping and collecting flue dust and means for cycling flue dust collected in said cyclone means back into said combustion air inlet of said oil burner.
Claim 2
Dependent Claim
55 words
An oil-fired heating plant comprising a combustion chamber, an oil burner having a combustion air inlet, said oil burner being located in said combustion chamber, a cyclone means for trapping and collecting flue dust and means for cycling flue dust collected in said cyclone means back into said combustion air inlet of said oil burner.
Claim 3
Dependent Claim
41 words
A heating plant according to claim 1 in which the flue dust cycling means comprises a conduit extending between the base of the cyclone and the air inlet of the oil burner and suction means are located in said conduit means.
Claim 4
Dependent Claim
15 words
A heating plant according to claim 2 in which the suction means comprises a fan.
Claim 5
Dependent Claim
16 words
A heating plant according to claim 3 in which the fan is a centrifugal air blower.
Claim 6
Dependent Claim
22 words
A heating plant according to claim 2 in which the suction means comprises a compressed gas injector adapted to entrain flue dust.
Claim 7
Dependent Claim
23 words
A heating plant according to claim 2 in which the conduit between the base of the cyclone and the combustion chamber is lagged.
Claim 8
Independent Claim
80 words
A method of disposal of combustible flue dust from an oil fired heating plant comprising the steps of: (i) passing flue gasses containing combustible flue dust from an oil fired burner combustion chamber into a cyclone; (ii) trapping and collecting said flue dust in the cyclone; (iii) recirculating the collected flue dust to the air inlet of the oil burner; and (iv) injecting the flue dust into said air inlet, whereby the flue dust is burned in the heating plant.
Claim 9
Independent Claim
80 words
A method of disposal of combustible flue dust from an oil fired heating plant comprising the steps of: (i) passing flue gasses containing combustible flue dust from an oil fired burner combustion chamber into a cyclone; (ii) trapping and collecting said flue dust in the cyclone; (iii) recirculating the collected flue dust to the air inlet of the oil burner; and (iv) injecting the flue dust into said air inlet, whereby the flue dust is burned in the heating plant.
Claim 10
Dependent Claim
16 words
A method according to claim 7 in which the flue dust is recirculated by suction means.
Claim 11
Dependent Claim
37 words
A method according to claim 7 in which the flue dust is recirculated by use of a compressed gas injector to entrain flue dust and thereby transport it back to the air inlet of the oil burner.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-29 | 1979-12-29 | 1980-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-29 | 1983-12-29 | 1984-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-29 | 1987-12-29 | 1988-06-29 | $7700.00 | Window Closed / Lapsed |