US3850148A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Forced through-flow steam generator having a superimposed forced circulation
Assignee: Sulzer AG
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Filing: 1973-06-12
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Granted: 1974-11-26
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Expires: 1993-06-12
Abstract
Abstract An injection line is branched off from a point downstream of the circulating pump to inject water into a point between two of the superheaters. The flow rate in this line is measured and a corresponding signal is sent to a controller for regulating the amount of feed water delivered to the steam generator. This signal is superimposed on a signal of opposite sign derived from a measurement of the feed water rate downstream of the feed pump.
Inventors
- 👤 F Laubli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:48
CPC Classifications
F; F22; F22B; F22B35/00; F22B35/06; F22B35/10; F22B35/104; F22B35/101; F22G; F22G5/00; F22G5/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
216 words
A forced through-flow steam generator comprising a main working fluid path including, in series, a feed pump, a feed valve, a circulation pump, an evaporator, a water/steam separator and at least two superheaters; a circulation path including a line extending from said separator to said main working fluid path upstream of said circulation pump; a water injection line extending from said main working fluid path between said circulation pump and said evaporator to an injection point in said main working fluid path between said superheaters, and an injection valve in said line for controlling the flow therethrough in response to the temperature downstream of said superheaters; and means for regulating the feed water flow including a first device for measuring the flow delivered downstream of said feed pump, a second device for measuring the flow in said water injection line, and a controller connected to each said device and to said feed valve for adjusting the feed water flow from said feed pump in dependence upon the flow rate measured by said first device to tend to maintain the feed water flow at a set value and in dependence upon the flow rate measured by said second device to tend to increase the feed water flow as the flow rate measured by said second device increases.
Claim 2
Dependent Claim
216 words
A forced through-flow steam generator comprising a main working fluid path including, in series, a feed pump, a feed valve, a circulation pump, an evaporator, a water/steam separator and at least two superheaters; a circulation path including a line extending from said separator to said main working fluid path upstream of said circulation pump; a water injection line extending from said main working fluid path between said circulation pump and said evaporator to an injection point in said main working fluid path between said superheaters, and an injection valve in said line for controlling the flow therethrough in response to the temperature downstream of said superheaters; and means for regulating the feed water flow including a first device for measuring the flow delivered downstream of said feed pump, a second device for measuring the flow in said water injection line, and a controller connected to each said device and to said feed valve for adjusting the feed water flow from said feed pump in dependence upon the flow rate measured by said first device to tend to maintain the feed water flow at a set value and in dependence upon the flow rate measured by said second device to tend to increase the feed water flow as the flow rate measured by said second device increases.
Claim 3
Dependent Claim
134 words
A forced through-flow steam generator as set forth in claim 1 which further includes a level measuring element connected to said separator for measuring the level of water therein and emitting a signal in response thereto, a temperature sensor downstream of the first of said superheaters for measuring the temperature of steam therebetween and emitting a signal in response thereto, a proportional plus integral action controller selectively connected to one of said element and sensor to receive a signal therefrom, and a load transmitter connected to said latter controller to deliver a set value signal thereto for comparison with the received signal; said latter controller being connected to said first controller to deliver a set value thereto corresponding to the compared signals in said latter controller for comparison with signals received from said devices.
Claim 4
Independent Claim
190 words
A method of controlling a forced through-flow steam generator having a main working fluid path including, in series, a feed pump, a feed valve, a circulation pump, an evaporator, a water/steam separator and at least two superheaters; a circulation path including a line extending from said separator to said main working fluid path upstream of said circulation pump; a water injection line extending from said main working fluid path between said circulation pump and said evaporator to an injection point in said main working fluid path between said superheaters, and an injection valve in said line for controlling the flow therethrough in response to the temperature downstream of said superheaters; and comprising the steps of measuring the flow delivered by said feed pump; measuring the flow in said water injection line; and adjusting the flow delivered by said feed pump in dependence upon the flow delivered by said feed pump to tend to maintain the feed water flow at a set value and in dependence upon the flow in said water injection line to tend to increase the feed water flow as the flow in said water injection line increases.
Claim 5
Independent Claim
190 words
A method of controlling a forced through-flow steam generator having a main working fluid path including, in series, a feed pump, a feed valve, a circulation pump, an evaporator, a water/steam separator and at least two superheaters; a circulation path including a line extending from said separator to said main working fluid path upstream of said circulation pump; a water injection line extending from said main working fluid path between said circulation pump and said evaporator to an injection point in said main working fluid path between said superheaters, and an injection valve in said line for controlling the flow therethrough in response to the temperature downstream of said superheaters; and comprising the steps of measuring the flow delivered by said feed pump; measuring the flow in said water injection line; and adjusting the flow delivered by said feed pump in dependence upon the flow delivered by said feed pump to tend to maintain the feed water flow at a set value and in dependence upon the flow in said water injection line to tend to increase the feed water flow as the flow in said water injection line increases.
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) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |