US3701341A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and process for slag deposit removal
Assignee: Foster Wheeler Inc
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Filing: 1971-03-18
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Granted: 1972-10-31
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Expires: 1991-03-18
Abstract
Abstract An apparatus and process for slag deposit removal wherein water is injected under pressure towards the heat absorption surface in the furnace section of a vapor generator to create a thermal shock and a mechanical force which causes the slag deposits on the surface to separate therefrom. A nozzle is provided which has a plurality of orifice units extending at different acute angles with respect to a plane perpendicular to the longitudinal axis of the body portion of the nozzle, so that when the nozzle is rotated, a plurality of spiral streams of cleaning fluid are injected.
Inventors
- 👤 Cullie B Willis Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:44
CPC Classifications
F; F28; F28G; F28G3/00; F28G3/16; F28G3/163
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
141 words
A slag deposit removal apparatus for cleaning the heat absorption surface of an inner wall in the furnace section of a vapor generator, said apparatus comprising a plurality of blast nozzles, each comprising a body portion and at least two orifice units directed towards said wall and extending from said body portion at two different angles with respect to a plane perpendicular to the longitudinal axis of said body portion; means to supply a fluid to said nozzles; means to translate said nozzles inside said furnace; and means to rotate said nozzles during their translation inside said furnace to create two continuously increasing spirals of fluid of varying patterns which impinge against said wall to direct a combined thermal shock and mechanical force against said heat absorption surface and cause the separation of the slag deposit from said heat absorption surface.
Claim 2
Dependent Claim
141 words
A slag deposit removal apparatus for cleaning the heat absorption surface of an inner wall in the furnace section of a vapor generator, said apparatus comprising a plurality of blast nozzles, each comprising a body portion and at least two orifice units directed towards said wall and extending from said body portion at two different angles with respect to a plane perpendicular to the longitudinal axis of said body portion; means to supply a fluid to said nozzles; means to translate said nozzles inside said furnace; and means to rotate said nozzles during their translation inside said furnace to create two continuously increasing spirals of fluid of varying patterns which impinge against said wall to direct a combined thermal shock and mechanical force against said heat absorption surface and cause the separation of the slag deposit from said heat absorption surface.
Claim 3
Dependent Claim
35 words
The apparatus of claim 1 wherein said translating means is adapted to automatically translate said nozzles between an operative position inside said furnace and an inoperative position outside said furnace according to a predetermined sequence.
Claim 4
Dependent Claim
21 words
The apparatus of claim 1 wherein said body portion is cylindrical and wherein said orifice units extend radially with respect thereto.
Claim 5
Dependent Claim
15 words
The apparatus of claim 3 wherein there are two orifice units spaced approximately 180* apart.
Claim 6
Dependent Claim
67 words
A process for the removal of deposits of slag from the heat absorption surface of the furnace section of a vapor generator, comprising the steps of simultaneously spraying at least two streams of cleaning fluid towards said surface at different angles thereTo from at least one nozzle, rotating said nozzle, and translating said nozzle relative to said surface, to form two different continuously increasing spiral spray patterns.
Claim 7
Dependent Claim
67 words
A process for the removal of deposits of slag from the heat absorption surface of the furnace section of a vapor generator, comprising the steps of simultaneously spraying at least two streams of cleaning fluid towards said surface at different angles thereTo from at least one nozzle, rotating said nozzle, and translating said nozzle relative to said surface, to form two different continuously increasing spiral spray patterns.
Claim 8
Dependent Claim
30 words
The process of claim 5 in which the spraying of said fluid is controlled so that the spraying is periodically and sequentially activated in accordance with the build-up of slag.
Claim 9
Dependent Claim
32 words
The process of claim 5 wherein said step of translating is done automatically between an operative position inside said furnace and an inoperative position outside said furnace according to a predetermined sequence.
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) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |