Patent US2210584A successfully refreshed from Google Patents.
US3608526A
Expired / Lapsed
US
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Method and apparatus for deriving useful steam from a fluctuating heat source
Assignee: American Waagner-Biro Co Inc
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Filing: 1969-08-05
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Granted: 1971-09-28
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Expires: 1989-08-05
Abstract
Abstract A method and apparatus for deriving useful steam from a fluctuating source of heat. The apparatus includes a heatexchanger system which operates under conditions of high heat transfer with natural circulation when steam is withdrawn from the system and which requires forced circulation during operation under conditions of low heat transfer. A single high-pressure booster pump installation coacts with the system to provide a supply of new liquid to the system during periods of high heat transfer and to provide forced circulation during periods of low heat transfer, the booster pump installation being operated constantly at its full capacity and controlled to achieve a constant liquid flow through the system under all operating conditions. The booster pumps have their output connected to a jet pump which forms part of the system so that natural circulation can take place through the jet pump while forced circulation can be provided by way of a jet provided in the jet pump by the booster pumps.
Inventors
- 👤 Roland Kemmetmueller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:40
CPC Classifications
F; F22; F22B; F22B1/00; F22B1/02; F22B1/18; F22B1/183
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
149 words
In a method for operating a heat-exchanger system under greatly fluctuating conditions of high and low heat transfer, the steps of operating the system with at least partial natural circulation during high heat transfer, when fluid is withdrawn from the system, and with forced circulation during periods of low heat transfer, operating a single high-pressure booster pump installation continuously at full capacity while providing said forced circulation through said single pump installation during periods of low heat transfer and while providing a combination of natural circulation and replenishing the liquid of the system with said single pump installation during periods of high heat transfer, and providing between the forced circulation and supply of new replenishing liquid to the system, on the one hand, and the natural circulation, on the other hand, a relationship which maintains a substantially constant flow of liquid through the heat exchanger under all operating conditions.
Claim 2
Dependent Claim
149 words
In a method for operating a heat-exchanger system under greatly fluctuating conditions of high and low heat transfer, the steps of operating the system with at least partial natural circulation during high heat transfer, when fluid is withdrawn from the system, and with forced circulation during periods of low heat transfer, operating a single high-pressure booster pump installation continuously at full capacity while providing said forced circulation through said single pump installation during periods of low heat transfer and while providing a combination of natural circulation and replenishing the liquid of the system with said single pump installation during periods of high heat transfer, and providing between the forced circulation and supply of new replenishing liquid to the system, on the one hand, and the natural circulation, on the other hand, a relationship which maintains a substantially constant flow of liquid through the heat exchanger under all operating conditions.
Claim 3
Dependent Claim
29 words
In a method as recited in claim 1 and wherein the booster pump installation has suction and discharge sides maintained at a constant differential pressure under all operating conditions.
Claim 4
Dependent Claim
34 words
In a method as recited in claim 2 and wherein the speed of operation of the pump installation is regulated to maintain the constant liquid flow in the heat-exchanger system under all operating conditions.
Claim 5
Dependent Claim
60 words
In a method as recited in claim 2 and wherein the system includes a jet pump receiving a jet of liquid from said single pump installation and also receiving and discharging liquid during natural circulation, the step of controlling the operation of said jet pump to contribute to the maintenance of the constant liquid flow through the heat exchanger system.
Claim 6
Dependent Claim
31 words
In a method as recited in claim 4, the step of bypassing the jet pump when the pressure of liquid pumped by said single pump installation rises to a given value.
Claim 7
Dependent Claim
142 words
In an apparatus for deriving steam from a fluctuating heat source, a heat-exchanger system operating under conditions of great fluctuation between high and low heat transfer, first means for operating the system with at least partial natural circulation during the high heat transfer condition, providing useful steam which can be withdrawn from the system, and second means for operating the system with forced circulation during the low heat transfer condition, said second means including a single pumping installation operatively connected with said system for providing forced circulation therethrough during periods of low heat transfer and for supplying new liquid to the system simultaneously with the operation of said first means during periods of high heat transfer, and control means coacting with said single pumping installation for operating the latter to maintain substantially constant liquid flow through the system under all operating conditions.
Claim 8
Dependent Claim
142 words
In an apparatus for deriving steam from a fluctuating heat source, a heat-exchanger system operating under conditions of great fluctuation between high and low heat transfer, first means for operating the system with at least partial natural circulation during the high heat transfer condition, providing useful steam which can be withdrawn from the system, and second means for operating the system with forced circulation during the low heat transfer condition, said second means including a single pumping installation operatively connected with said system for providing forced circulation therethrough during periods of low heat transfer and for supplying new liquid to the system simultaneously with the operation of said first means during periods of high heat transfer, and control means coacting with said single pumping installation for operating the latter to maintain substantially constant liquid flow through the system under all operating conditions.
Claim 9
Dependent Claim
121 words
The combination of claim 6 and wherein said single pump installation includes high-pressure booster pumps adapted to operate continuously at full capacity and a jet connected into a the heat-exchanger system so that natural circulation can take place through said jet pump, said jet pump being operatively connected to the output of the booster pumps for receiving a jet of liquid therefrom, saiD second means including forced circulation valve means providing communication between the input of said booster pumps and said system to provide forced circulation during periods of low heat transfer, and said first means including supply valve means for providing communication between the input of said booster pumps and a source of feedwater during periods of high heat transfer.
Claim 10
Dependent Claim
71 words
The combination of claim 7 and wherein said control means is operatively connected in the system for sensing the condition of the fluid flowing therethrough, said control means being operatively connected to said forced circulation valve means and said supply valve means for automatically closing the latter and opening the former during periods of low heat transfer and closing the former and opening the latter during periods of high heat transfer.
Claim 11
Dependent Claim
40 words
The combination of claim 8 and wherein a bypass valve means communicates with the system and the output of the booster pumps for bypassing the jet pump when a given pressure is reached at the output of the booster pumps.
Claim 12
Dependent Claim
59 words
The combination of claim 8 and wherein a subsidiary heat exchanger is situated between said forced circulation valve means and the input of said booster pumps, for preheating feedwater flowing through said supply valve means and for cooling forced circulation liquid delivered through said forced circulation valve means to the input of said booster pumps to prevent cavitation effects.
Claim 13
Dependent Claim
54 words
The combination of claim 8 and wherein a steam drum forms part of said system and an accumulator receiving steam from said steam drum during periods of high heat transfer for providing useful steam which can be constantly withdrawn from said accumulator, said automatic control means being situated between said steam drum and accumulator.
Claim 14
Dependent Claim
125 words
The combination of claim 8 and wherein there are a pair of said heat-exchanger systems which respectively have operation at high heat transfer at different times, a single accumulator communicating with both systems for deriving therefrom useful steam which may be withdrawn from said accumulator, a pair of said automatic control means being respectively located in parts both systems which respectively lead directly into said accumulator, and a single forced circulation valve means, supply valve means, and booster pump unit operatively connected with both of said systems, each of said control means being operatively connected with the forced circulation valve means and supply valve means and the system including a pair of jet pumps both of which are supplied by the single booster pump unit.
References Cited (Backward Citations)
US2704534A
Cited
US3234920A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |