US3662717A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waste-heat boiler
Assignee: Shell USA Inc
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Filing: 1970-12-30
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Granted: 1972-05-16
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Expires: 1990-12-30
Abstract
Abstract An improved waste-heat boiler for cooling and recovering heat from hot gases. The improvement comprises employing two concentric tubes for delivering coolant liquid, the coolant liquid from the inner concentric tube under pressure serving as feed to a plurality of ejectors which draw coolant liquid from the outer concentric tube and by means of an arrangement of spray nozzle arms, direct the coolant against the bottom plate of the boiler and the inlet ends of the heat exchange tubes connected thereto.
Inventors
- 👤 Leonard Willem Ter Haar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:29
CPC Classifications
C; C10; C10K; C10K1/00; C10K1/04; C01; C01B; C01B3/00; C01B3/02; C01B3/32; C01B3/34; C01B3/36; C01B3/363; F; F28; F28D; F28D7/00; F28D7/02; F28D7/024; Y; Y02; Y02P; Y02P20/00; Y02P20/10; Y02P20/129
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
223 words
A waste-heat boiler for generating vapors from a coolant by heat transfer from a high temperature gas which comprises: (1) a closed vessel having a bottom plate and an outlet means for discharging vaporized and liquid coolant; (2) a plurality of straight tubes into which hot gas is introduced, each connected at its inlet end to the bottom plate and at its outlet end to a helically coiled tube through which the gas is flowed and discharged from an upper part of said vessel; (3) two vertical concentric tubes for supplying coolant liquid mounted within said vessel in a radially spaced relation thereto and defining with said vessel an elongated annular space in which said straight and helically coiled tubes are situated; (4) a central ejector and plurality of ancillary ejectors by means of which coolant is drawn from the outer of said concentric tubes, said ejectors issuing from the lower end of the inner of said concentric tubes and being fed by coolant supplied therefrom; (5) a central spray nozzle arm and plurality of ancillary spray nozzle arms extending from the lower end of the outer concentric tube, positioned so as to receive the coolant discharged from the ejector and drawn from the outer concentric tube, and discharge the same against the bottom plate and the inlet ends of said straight tubes.
Claim 2
Dependent Claim
223 words
A waste-heat boiler for generating vapors from a coolant by heat transfer from a high temperature gas which comprises: (1) a closed vessel having a bottom plate and an outlet means for discharging vaporized and liquid coolant; (2) a plurality of straight tubes into which hot gas is introduced, each connected at its inlet end to the bottom plate and at its outlet end to a helically coiled tube through which the gas is flowed and discharged from an upper part of said vessel; (3) two vertical concentric tubes for supplying coolant liquid mounted within said vessel in a radially spaced relation thereto and defining with said vessel an elongated annular space in which said straight and helically coiled tubes are situated; (4) a central ejector and plurality of ancillary ejectors by means of which coolant is drawn from the outer of said concentric tubes, said ejectors issuing from the lower end of the inner of said concentric tubes and being fed by coolant supplied therefrom; (5) a central spray nozzle arm and plurality of ancillary spray nozzle arms extending from the lower end of the outer concentric tube, positioned so as to receive the coolant discharged from the ejector and drawn from the outer concentric tube, and discharge the same against the bottom plate and the inlet ends of said straight tubes.
Claim 3
Dependent Claim
35 words
The waste-heat boiler of claim 1 wherein the number of ancillary ejectors is equal to the number of straight tubes and the ancillary spray nozzle arms are arranged symmetrically and issue between the straight tubes.
Claim 4
Dependent Claim
29 words
The waste-heat boiler of claim 2 wherein the spray nozzle arms are curved laterally so that the discharged coolant acquires a direction of movement with a horizontal velocity component.
Claim 5
Dependent Claim
41 words
The waste-heat boiler of claim 1 wherein the space at the point the ejectors and spray nozzle arms are connected to the concentric tubes has a free cross-sectional area of less than 30 percent of the space accommodating the helical coils.
Claim 6
Dependent Claim
18 words
The waste-heat boiler of claim 1 wherein baffle plates are present in the space accommodating the straight tubes.
References Cited (Backward Citations)
US2790428A
Cited
US2967515A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |