US3771497A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vapor generator control
Assignee: Babcock International Ltd
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Filing: 1972-04-26
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Granted: 1973-11-13
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Expires: 1992-04-26
Abstract
Abstract A vapor generating system comprising a pressure vessel wherein secondary liquid is vaporized through indirect heat exchange with a hot primary fluid and including a control arrangement whereby thermal shock stresses in the vessel are limited by controlled preheating of secondary liquid being fed thereto.
Inventors
- 👤 T Sprague
- 👤 J Schlicting
- 👤 B Mcdonald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:07
CPC Classifications
F; F22; F22B; F22B35/00; F22B35/004; F22B1/00; F22B1/02; F22B1/023; F22B1/026; G; G21; G21D; G21D5/00; G21D5/04; G21D5/08; G21D5/12; Y; Y02; Y02E; Y02E30/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
142 words
A vapor generating system having a pressure vessel, a primary fluid and a secondary liquid flowing in physically separated heat exchange through said vessel wherein heat extracted from the primary fluid is used to vaporize the secondary liquid, the improvement comprising means for regulating the temperature of the secondary liquid entering the vessel including a heat exchanger and a plurality of hot fluid sources located outside the vessel, the heat exchanger being disposed to receive hot fluid from a selected one of said sources for heating the secondary liquid entering the vessel, control apparatus for selecting said source and adjusting the hot fluid input rate to the heat exchanger to correspondingly adjusT the temperature of the secondary liquid entering the vessel thereby maintaining the temperature difference between the entering secondary liquid and the primary fluid leaving the vessel within a given limit.
Claim 2
Dependent Claim
142 words
A vapor generating system having a pressure vessel, a primary fluid and a secondary liquid flowing in physically separated heat exchange through said vessel wherein heat extracted from the primary fluid is used to vaporize the secondary liquid, the improvement comprising means for regulating the temperature of the secondary liquid entering the vessel including a heat exchanger and a plurality of hot fluid sources located outside the vessel, the heat exchanger being disposed to receive hot fluid from a selected one of said sources for heating the secondary liquid entering the vessel, control apparatus for selecting said source and adjusting the hot fluid input rate to the heat exchanger to correspondingly adjusT the temperature of the secondary liquid entering the vessel thereby maintaining the temperature difference between the entering secondary liquid and the primary fluid leaving the vessel within a given limit.
Claim 3
Independent Claim
157 words
The method of operating a vapor generating system including a pressure vessel, a primary fluid and a secondary liquid flowing in physically separated heat exchange through said vessel wherein heat extracted from the primary fluid is used to vaporize the secondary liquid, a heat exchanger and a plurality of hot fluid sources located outside the vessel, the heat exchanger being disposed to receive hot fluid from a selected one of said sources for heating the secondary liquid entering the vessel, and comprising the steps of: sensing the hot fluid pressure in at least one of said sources, selecting the source in accordance with said sensed pressure, determining the temperature of the secondary liquid in at least one given location, and varying the hot fluid input rate to the heat exchanger in accordance with said determined temperature to maintain the temperature difference between the entering secondary liquid and the primary fluid leaving the vessel within a given limit.
Claim 4
Independent Claim
157 words
The method of operating a vapor generating system including a pressure vessel, a primary fluid and a secondary liquid flowing in physically separated heat exchange through said vessel wherein heat extracted from the primary fluid is used to vaporize the secondary liquid, a heat exchanger and a plurality of hot fluid sources located outside the vessel, the heat exchanger being disposed to receive hot fluid from a selected one of said sources for heating the secondary liquid entering the vessel, and comprising the steps of: sensing the hot fluid pressure in at least one of said sources, selecting the source in accordance with said sensed pressure, determining the temperature of the secondary liquid in at least one given location, and varying the hot fluid input rate to the heat exchanger in accordance with said determined temperature to maintain the temperature difference between the entering secondary liquid and the primary fluid leaving the vessel within a given limit.
Claim 5
Dependent Claim
70 words
The improvement according to claim 1 wherein the control apparatus includes serially disposed first and second valves intermediate of and in flow communication with said hot fluid sources and heat exchanger, the first valve being operable for selecting the source and the second valve being operable for varying the rate of hot fluid being admitted into the heat exchanger, the first valve being upstream fluid flow-wise of said second valve.
Claim 6
Dependent Claim
30 words
The improvement according to claim 1 wherein the control apparatus includes separate means for determining the hot fluid pressure and the secondary liquid temperature in at least one given location.
Claim 7
Dependent Claim
28 words
The improvement according to claim 3 wherein the means for determining the hot fluid pressure includes pressure sensing means operatively associated with at least one of said sources.
Claim 8
Dependent Claim
25 words
The improvement according to claim 4 wherein the means for determining the secondary liquid temperature includes pressure sensing means operatively associated with said heat exchanger.
Claim 9
Dependent Claim
36 words
The improvement according to claim 4 wherein the means for determining the secondary liquid temperature includes a transducer disposed to sense the temperature of the secondary liquid entering the vessel and establish a signal representative thereof.
Claim 10
Dependent Claim
22 words
The improvement according to claim 4 including means for determining the temperature of the primary fluid in at least one given location.
Claim 11
Dependent Claim
36 words
The improvement according to claim 8 wherein the means for determining the primary fluid temperature includes a transducer disposed to sense the temperature of the primary fluid exiting the vessel and establish a signal representative thereof.
Claim 12
Dependent Claim
42 words
The improvement according to claim 2 including the steps of determining the temperature of the primary fluid in at least one given location and varying the hot fluid input rate to the heat exchanger in accordance with said determined primary fluid temperature.
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) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |