US3835650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steam air preheater for a steam boiler system
Assignee: General Electric Co
•
Filing: 1973-05-03
•
Granted: 1974-09-17
•
Expires: 1993-05-03
Abstract
Abstract A steam boiler system includes a steam air preheater disposed in inlet ducting for preheating intake air. A boiler feed pump provides high-pressure water to a boiler which in turn produces steam to drive a main turbine. Exhaust flow from the turbine is routed directly to a main condenser, with the exception of a small extraction flow which is used to drive a boiler feed pump turbine. Prior to returning to the condenser, the boiler feed pump turbine exhaust is conducted through the steam air preheater. As system conditions demand, the boiler feed pump turbine exhaust is sent directly to the condenser without going through the steam air preheater.
Inventors
- 👤 S Chesmejef
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:54
CPC Classifications
F; F01; F01K; F01K7/00; F01K7/34; F01K7/44
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
237 words
An improved steam boiler system of the type including a boiler, combustion means for heating intake air supplied to said boiler, inlet ducting for intake air being fed to said combustion means, a boiler feed pump supplying feedwater to said boiler, a main turbine driven by the output of said boiler, a boiler feed pump turbine for driving said boiler feed pump, said boiler feed pump turbine being driven by extraction flow of steam from said main turbine, and a condenser receiving exhaust from said main turbine, wherein the improvement comprises a steam air preheater disposed within said ducting and intermediate said boiler feed pump turbine and said condenser, a first conduit with a first control valve therein connecting said boiler feed pump turbine to said preheater for supplying exhaust steam from said boiler feed pump turbine to said preheater to transfer heat energy to said intake air, said preheater discharging its output to said condenser, and a bypass comprising a second conduit with a second control valve therein connecting said first conduit to said condenser, said second conduit tapped from said first conduit at a point upstream of said first control valve, first means responsive to a predetermined temperature of said output of said preheater for controlling said first valve, and said second valve responsive to a predetermined pressure of the boiler feed pump turbine exhaust, thereby varying the amount of steam supplied to said preheater.
Claim 2
Dependent Claim
237 words
An improved steam boiler system of the type including a boiler, combustion means for heating intake air supplied to said boiler, inlet ducting for intake air being fed to said combustion means, a boiler feed pump supplying feedwater to said boiler, a main turbine driven by the output of said boiler, a boiler feed pump turbine for driving said boiler feed pump, said boiler feed pump turbine being driven by extraction flow of steam from said main turbine, and a condenser receiving exhaust from said main turbine, wherein the improvement comprises a steam air preheater disposed within said ducting and intermediate said boiler feed pump turbine and said condenser, a first conduit with a first control valve therein connecting said boiler feed pump turbine to said preheater for supplying exhaust steam from said boiler feed pump turbine to said preheater to transfer heat energy to said intake air, said preheater discharging its output to said condenser, and a bypass comprising a second conduit with a second control valve therein connecting said first conduit to said condenser, said second conduit tapped from said first conduit at a point upstream of said first control valve, first means responsive to a predetermined temperature of said output of said preheater for controlling said first valve, and said second valve responsive to a predetermined pressure of the boiler feed pump turbine exhaust, thereby varying the amount of steam supplied to said preheater.
Claim 3
Dependent Claim
101 words
A power plant comprising: at least one main turbine; a boiler supplying steam to the main turbine; a combustor supplying heat to the boiler including an inlet air duct supplying air to the combustor; a boiler feed pump supplying feedwater to the boiler, the boiler feed pump driven by a boiler feed pump turbine, the feed pump turbine driven by extraction steam from the main turbine; a steam air preheater disposed in the air inlet duct; and, a first steam conduit having a first valve therein, the steam conduit interconnecting the boiler feed pump turbine exhaust with the steam air preheater.
Claim 4
Dependent Claim
101 words
A power plant comprising: at least one main turbine; a boiler supplying steam to the main turbine; a combustor supplying heat to the boiler including an inlet air duct supplying air to the combustor; a boiler feed pump supplying feedwater to the boiler, the boiler feed pump driven by a boiler feed pump turbine, the feed pump turbine driven by extraction steam from the main turbine; a steam air preheater disposed in the air inlet duct; and, a first steam conduit having a first valve therein, the steam conduit interconnecting the boiler feed pump turbine exhaust with the steam air preheater.
Claim 5
Dependent Claim
26 words
The power plant recited in claim 2 further including a temperature sensor at the steam air preheater exhaust, the first valve connected with the temperature sensor.
Claim 6
Dependent Claim
67 words
The power plant recited in claim 2 further including a condenser connected to the main turbine exhaust; and, a steam bypass conduit including a second steam conduit and a second valve, the second steam conduit interconnecting the first steam conduit and the condenser at a point upstream from the first valve, the second valve being a control valve responsive to the boiler feed pump turbine exhaust pressure.
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) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |