Patent US4080789A successfully refreshed from Google Patents.
US4080789A
Expired / Lapsed
US
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Steam generator
Assignee: Sulzer AG
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Filing: 1976-09-24
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Granted: 1978-03-28
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Expires: 1996-09-24
Abstract
Abstract A line is connected to a branch point between the gas-heated preheater and evaporator to deliver heated feed water to the supply tank while control valves are placed in the feed line to the preheater and the line to the supply tank. These valves are controlled by a temperature measuring means adjacent the branch point. If the measured temperature increases, the flow of feed water to the preheater increases.
Inventors
- 👤 Dieter Frei
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:33
CPC Classifications
F; F22; F22D; F22D5/00; F22D5/26; F22B; F22B35/00; F22B35/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
195 words
A steam generator comprising an evaporator for evaporating feed water to steam, said evaporator being disposed in a flow path of hot gas; a feed water preheater disposed in said flow path downstream of said evaporator relative to the flow of hot gas for preheating a flow of feed water therein; a tank containing feed water; a feed pump connected between said tank and said preheater for pumping feed water from said tank to said preheater; a line connected between said preheater and said evaporator for taking off heated feed water, said line being connected to said tank to deliver heated feed water thereto; a throttling means in said line for controlling the flow of heated feed water delivered to said tank; and control means for increasing the amount of feed water flowing through said preheater and said line in response to an increase in temperature of the feed water in said preheater and for decreasing the amount of feed water in response to a decrease in temperature of the feed water in said preheater, said control means including a temperature measuring means for measuring the temperature of the feed water passing from said preheater.
Claim 2
Dependent Claim
195 words
A steam generator comprising an evaporator for evaporating feed water to steam, said evaporator being disposed in a flow path of hot gas; a feed water preheater disposed in said flow path downstream of said evaporator relative to the flow of hot gas for preheating a flow of feed water therein; a tank containing feed water; a feed pump connected between said tank and said preheater for pumping feed water from said tank to said preheater; a line connected between said preheater and said evaporator for taking off heated feed water, said line being connected to said tank to deliver heated feed water thereto; a throttling means in said line for controlling the flow of heated feed water delivered to said tank; and control means for increasing the amount of feed water flowing through said preheater and said line in response to an increase in temperature of the feed water in said preheater and for decreasing the amount of feed water in response to a decrease in temperature of the feed water in said preheater, said control means including a temperature measuring means for measuring the temperature of the feed water passing from said preheater.
Claim 3
Dependent Claim
82 words
A steam generator as set forth in claim 1 wherein said control means further includes a control valve between said pump and said preheater for controlling the amount of feed water pumped to said preheater, said temperature measuring means being connected to said control valve to open said valve in response to an increase in temperature of the feed water in said preheater and to close said valve in response to a decrease in temperature of the feed water in said preheater.
Claim 4
Dependent Claim
97 words
A steam generator as set forth in claim 1 which further comprises a steam/water drum connected between said preheater and said evaporator, and wherein said control means further includes a level measuring means for measuring the level of water in said drum, said level measuring means being connected to said throttling means to increase the flow of heated feed water to said tank in response to an increase in water level in said drum and to decrease the flow of heated feed water to said tank in response to a decrease in water level in said drum.
Claim 5
Dependent Claim
82 words
a steam generator as set forth in claim 3 wherein said control means further includes a control valve between said pump and said preheater for controlling the amount of feed water pumped to said preheater, said temperature measuring means being connected to said control valve to open said valve in response to an increase in temperature of the feed water in said preheater and to close said valve in response to a decrease in temperature of the feed water in said preheater.
Claim 6
Dependent Claim
91 words
A steam generator as set forth in claim 3 wherein said control means further includes a control valve between said pump and said preheater for controlling the amount of feed water pumped to said preheater and a limiter connected between said level measuring means and said control valve to receive a signal from said level measuring means representative of the level of water in said drum and to deliver a correction signal to said control valve to open said valve in response to a decrease in water level in said drum.
Claim 7
Dependent Claim
66 words
A steam generator as set forth in claim 1 wherein said control means includes a controller connected to said temperature measuring means to receive a signal therefrom representative of the temperature of the feed water in said preheater and a second temperature measuring means connected to said controller to deliver a set point signal thereto representative of the temperature of the saturated steam in said evaporator.
Claim 8
Dependent Claim
24 words
A steam generator as set forth in claim 6 wherein said controller includes an input to receive a load-dependent signal from a signal transmitter.
Claim 9
Dependent Claim
104 words
A steam generator as set forth in claim 1 wherein said control means further includes a pressure gauge connected to said evaporator to measure the pressure of the feed water delivered thereto, a controller for controlling the flow of feed water to said preheater and having a set point input, and a function generator having an input to receive a signal from said pressure gauge representative of the saturated steam pressure in said evaporator and an output connected to said input of said controller to deliver a signal thereto representative of the saturated steam temperature as a function of the measured saturated steam pressure.
Claim 10
Dependent Claim
130 words
A steam generator as set forth in claim 8 wherein said control means further includes a first flow meter for measuring the flow of feed water pumped to said preheater, a second flow meter measuring the flow of heated feed water in said line to said tank, a flow controller connected to each of said meters to receive a flow measurement signal from each, and a second temperature measuring means connected to said evaporator in a region of incipient superheating to measure the temperature thereat and to deliver a representative signal to said flow controller, said flow controller having an output connected to said controller for delivering a signal thereto to increase the flow of feed water to said preheater in response to an increase in temperature in said evaporator.
Claim 11
Dependent Claim
63 words
A steam generator as set forth in claim 2 wherein said temperature measuring means is connected to said throttling means to increase the flow in said line in response to an increase in temperature of the feed water in said preheater and to decrease the flow in said line in response to a decrease in temperature of the feed water in said preheater.
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) | 1981-03-27 | 1981-09-26 | 1982-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-27 | 1985-09-26 | 1986-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-27 | 1989-09-26 | 1990-03-28 | $7700.00 | Window Closed / Lapsed |