US3875357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sewage disposal system
Assignee: Babcock and Wilcox Co
•
Filing: 1973-11-01
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Granted: 1975-04-01
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Expires: 1993-11-01
Abstract
Abstract A sewage disposal comprising a fossil-fuel fired steam generating unit having a furnace chamber and burner means for maintaining a high temperature zone in the furnace chamber, nozzle means for injecting a liquid-solids sewage mixture into the combustion zone, the sewage input being regulated to maintain a sewage to fuel input ratio resulting in substantially complete vaporization and incineration of the liquid-solids sewage mixture within the furnace chamber.
Inventors
- 👤 Edward P Foster
- 👤 Robert J Kelly
- 👤 Warnie L Sage
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:58
CPC Classifications
F; F23; F23G; F23G7/00; F23G7/001; C; C02; C02F; C02F11/00; C02F11/06; C02F11/12; C02F11/13; C02F2201/00; C02F2201/001; Y; Y02; Y02W; Y02W10/00; Y02W10/40
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
192 words
A sewage disposal comprising a liquid fuel fired steam generator, wall means including steam generating tubes and defining a furnace and passageway means in gas flow receiving communication with the furnace, burner means for firing liquid fuel within said furnace to maintain a high temperature combustion zone therein for the continuous generation of steam through indirect heat exchange, means for continuously metering the fuel input to the burner means, a flow circuit for conveying a liquid-solids sewage mixture to the furnace, said flow circuit including pump means for pressurizing the sewage mixture passing therethrough and nozzle means for injecting the pressurized sewage mixture directly into the combustion zone, means for introducing steam into said nozzle to atomize the sewage mixture passing therethrough, means responsive to said fuel metering means to allow injection of sewage only when the fuel input exceeds a predetermined level, means for continuously metering the sewage input to the nozzle means and means responsive to said fuel and sewage metering means to regulate the sewage input to maintain a sewage to fuel input ratio resulting in substantially complete vaporization and incineration of the liquid-solids sewage mixture within said furnace.
Claim 2
Dependent Claim
192 words
A sewage disposal comprising a liquid fuel fired steam generator, wall means including steam generating tubes and defining a furnace and passageway means in gas flow receiving communication with the furnace, burner means for firing liquid fuel within said furnace to maintain a high temperature combustion zone therein for the continuous generation of steam through indirect heat exchange, means for continuously metering the fuel input to the burner means, a flow circuit for conveying a liquid-solids sewage mixture to the furnace, said flow circuit including pump means for pressurizing the sewage mixture passing therethrough and nozzle means for injecting the pressurized sewage mixture directly into the combustion zone, means for introducing steam into said nozzle to atomize the sewage mixture passing therethrough, means responsive to said fuel metering means to allow injection of sewage only when the fuel input exceeds a predetermined level, means for continuously metering the sewage input to the nozzle means and means responsive to said fuel and sewage metering means to regulate the sewage input to maintain a sewage to fuel input ratio resulting in substantially complete vaporization and incineration of the liquid-solids sewage mixture within said furnace.
Claim 3
Dependent Claim
25 words
The sewage disposal according to claim 1 wherein the flow circuit includes comminuting means for grinding the sewage mixture before delivery to said nozzle means.
Claim 4
Dependent Claim
50 words
The sewage disposal according to claim 2 wherein the flow circuit includes screening means interposed between the comminuting and nozzle means, said screening means allowing only sewage of a predetermined size range to be delivered to the nozzle means while recycling the remainder to Said comminuting means for further grinding.
Claim 5
Dependent Claim
18 words
The sewage disposal according to claim 1 wherein the flow circuit includes means for temporarily accumulating the sewage.
Claim 6
Dependent Claim
28 words
The sewage disposal according to claim 4 including means for circulating air through the accumulated sewage mixture and means for venting the circulated air to said passageway means.
Claim 7
Independent Claim
137 words
A method for sewage disposal including a liquid fuel fired steam generator, wall means including steam generating tubes and defining a furnace and passageway means in gas flow receiving communication with the furnace, and comprising the steps of: firing liquid fuel within said furnace to maintain a high temperature combustion zone therein for the generation of steam through indirect heat exchange, continuously metering the fuel input to said furnace, injecting a pressurized liquid-solids sewage mixture into said combustion zone only when the fuel input exceeds a predetermined level, steam atomizing the sewage mixture prior to injection into said combustion zone, continuously metering the sewage input to said combustion zone, and regulating the sewage input to maintain a sewage to fuel input ratio resulting in substantially complete vaporization and incineration of the liquid-solids sewage mixture within said furnace.
Claim 8
Independent Claim
137 words
A method for sewage disposal including a liquid fuel fired steam generator, wall means including steam generating tubes and defining a furnace and passageway means in gas flow receiving communication with the furnace, and comprising the steps of: firing liquid fuel within said furnace to maintain a high temperature combustion zone therein for the generation of steam through indirect heat exchange, continuously metering the fuel input to said furnace, injecting a pressurized liquid-solids sewage mixture into said combustion zone only when the fuel input exceeds a predetermined level, steam atomizing the sewage mixture prior to injection into said combustion zone, continuously metering the sewage input to said combustion zone, and regulating the sewage input to maintain a sewage to fuel input ratio resulting in substantially complete vaporization and incineration of the liquid-solids sewage mixture within said furnace.
Claim 9
Dependent Claim
22 words
The method according to claim 6 including the step of chemically treating the sewage mixture prior to injection into said combustion zone.
Claim 10
Dependent Claim
21 words
The method according to claim 6 including the step of comminuting the sewage mixture prior to injection into said combustion zone.
Claim 11
Dependent Claim
37 words
The method according to claim 8 including the steps of screening the comminuted sewage to select only sewage of a predetermined size range for delivery to the nozzle means, and recycling the remaining sewage for further comminution.
Claim 12
Dependent Claim
23 words
The method according to claim 6 including the steps of temporarily accumulating the sewage mixture, and circulating air through the accumulated sewage mixture.
Claim 13
Dependent Claim
18 words
The method according to claim 10 including the step of venting the circulated air to said passageway means.
Claim 14
Dependent Claim
28 words
The method according to claim 6 wherein the step of maintaining a high temperature combustion zone comprises maintaining the temperature within the range of 2,500*F to 3, 500*F.
Claim 15
Dependent Claim
41 words
The method according to claim 6 wherein the step of injecting a pressurized liquid-solids sewage mixture into said combustion zone comprises injecting the sewage mixture only when the fuel input exceeds 10 per cent of maximum fuel input to said furnace.
Claim 16
Dependent Claim
37 words
The method according to claim 6 wherein the step of regulating sewage input comprises maintaining the sewage to fuel input ratio within the range of 0 to 3 lbs. of sewage to 1 lb. of liquid fuel.
References Cited (Backward Citations)
US3246761A
Cited
US3549529A
Cited
US3601070A
Cited
US3633746A
Cited
US3623977A
Cited
US3625883A
Cited
US3622511A
Cited
US3638590A
Cited
US3762549A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |