US3921406A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steam power generator apparatus of the regenerative cycle type
Assignee: Hitachi Ltd
•
Filing: 1974-05-14
•
Granted: 1975-11-25
•
Expires: 1994-05-14
Abstract
Abstract An apparatus comprising steam generator means, steam turbine means, condenser means and higher and lower pressure feed water heaters connected together to form a system through which steam and water are recirculated in a cycle. The feed water heater of the higher pressure side is connected to steam extraction lines connected to at least two expansion stages of the steam turbine means differing from each other in pressure and temperature, and control means is provided in such steam extraction lines for introducing steam extracted from the lower pressure stage of the turbine means into the feed water heater of the higher pressure side when the steam turbine means is operated under a higher load and for introducing steam extracted from the higher pressure stage of the turbine means thereinto when the steam turbine means is operated under a lower load, whereby thermal efficiency can be increased when the steam turbine means operates under a partial load of 50 to 80 percent.
Inventors
- 👤 Tsugutomo Teranishi
- 👤 Yoshiyuki Amano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:30
CPC Classifications
F; F01; F01K; F01K7/00; F01K7/34; F01K7/40
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
136 words
A steam power generator of the regenerative cycle type comprising steam generator means, steam turbine means, higher pressure and lower pressure feed water heater connected in series with one another, the feed water heater of the higher pressure side being connected to steam extraction lines connected to at least two expansion stages of said steam turbine means differing from each other in pressure and temperature, and control means mounted in said steam extraction lines for effecting control such that steam extraction from the lower pressure stage of the steam turbine means is introduced into the feed water heater of the higher pressure side when the steam turbine is operated under a higher load and steam extraction from the higher pressure stage thereof is introduced thereinto when the steam turbine means is operated under a lower load.
Claim 2
Dependent Claim
136 words
A steam power generator of the regenerative cycle type comprising steam generator means, steam turbine means, higher pressure and lower pressure feed water heater connected in series with one another, the feed water heater of the higher pressure side being connected to steam extraction lines connected to at least two expansion stages of said steam turbine means differing from each other in pressure and temperature, and control means mounted in said steam extraction lines for effecting control such that steam extraction from the lower pressure stage of the steam turbine means is introduced into the feed water heater of the higher pressure side when the steam turbine is operated under a higher load and steam extraction from the higher pressure stage thereof is introduced thereinto when the steam turbine means is operated under a lower load.
Claim 3
Dependent Claim
112 words
A steam power generator apparatus as claimed in claim 1 wherein the feed water heater of the lower pressure side is connected to steam extraction lines connected to at least two expansion stages of said steam turbine means differing from each other and lower than said first mentioned two expansion stages of the steam turbine means in pressure, whereby steam extraction from the lower pressure stage can be introduced into the feed water heater of the lower pressure side when the steam turbine is operated under a higher load and steam extraction from the higher pressure stage can be introduced thereinto when the steam turbine means is operated under a higher load.
Claim 4
Dependent Claim
52 words
A steam power generator apparatus as claimed in claim 1 wherein a steam extraction change-over switch is mounted in each of said steam extraction line and there is provided a generator load detector which detects the generator load and produces signals for controlling said steam extraction change-over valves through an electric system.
Claim 5
Dependent Claim
201 words
A steam power generator of the regenerative cycle type comprising steam generator means, steam turbine means, and higher and lower pressure feed water heaters connected in series with one another, wherein the feed water heater of the lower pressure side is connected to steam extraction lines connected to at least two expansion stages of said steam turbine means differing from each other in pressure, the feed water heater of the higher pressure side being connected to a steam extraction line connected to a higher pressure expansion stage of said steam turbine means, whereby steam extraction is introduced into the feed water heater of the higher pressure side at a reduced pressure when the steam turbine means is operated under a higher load and steam extraction can be introduced thereinto without having its pressure substantially reduced when the steam turbine means is operated under a lower load and whereby steam extraction from the lower pressure stage can be introduced into the feed water heater of the lower pressure side when the steam turbine is operated under a higher load and steam extraction from the higher pressure stage can be introduced thereinto when the steam turbine means is operated under a lower load.
Claim 6
Dependent Claim
201 words
A steam power generator of the regenerative cycle type comprising steam generator means, steam turbine means, and higher and lower pressure feed water heaters connected in series with one another, wherein the feed water heater of the lower pressure side is connected to steam extraction lines connected to at least two expansion stages of said steam turbine means differing from each other in pressure, the feed water heater of the higher pressure side being connected to a steam extraction line connected to a higher pressure expansion stage of said steam turbine means, whereby steam extraction is introduced into the feed water heater of the higher pressure side at a reduced pressure when the steam turbine means is operated under a higher load and steam extraction can be introduced thereinto without having its pressure substantially reduced when the steam turbine means is operated under a lower load and whereby steam extraction from the lower pressure stage can be introduced into the feed water heater of the lower pressure side when the steam turbine is operated under a higher load and steam extraction from the higher pressure stage can be introduced thereinto when the steam turbine means is operated under a lower load.
References Cited (Backward Citations)
US3457725A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |