US4282715A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for preventing corrosion in a steam power plant
Assignee: BBC Brown Boveri AG Switzerland
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Filing: 1978-11-13
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Granted: 1981-08-11
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Expires: 1998-11-13
Abstract
Abstract A steam power plant includes a nuclear reactor for generating a supply of steam. The steam is conducted to a first turbine which forms a high pressure stage of the steam power plant. A second turbine which is located downstream of the first turbine forms an intermediate pressure stage. Additional turbines may be arranged so as to provide still lower pressure stages for the power plant. To prevent corrosion, hydrogen peroxide is added to the steam immediately upstream of the first turbine. Additional hydrogen peroxide may be added immediately upstream of subsequent turbines. The hydrogen peroxide is added by spraying and is preferably supplied in a concentration of 25 to 50 parts per billion of steam. Preferably, the hydrogen peroxide is in a concentration of 1% to 5% prior to spraying.
Inventors
- 👤 Bengt Edwall
- 👤 Anders Kullendorff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:56
CPC Classifications
F; F01; F01D; F01D25/00; F01D25/007
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
41 words
A method of operating a steam power plant with corrosion prevention, comprising the steps of: generating a supply of steam; adding hydrogen peroxide to the steam; supplying the steam to a first turbine; and, driving the first turbine with the steam.
Claim 2
Independent Claim
41 words
A method of operating a steam power plant with corrosion prevention, comprising the steps of: generating a supply of steam; adding hydrogen peroxide to the steam; supplying the steam to a first turbine; and, driving the first turbine with the steam.
Claim 3
Dependent Claim
25 words
The method of claim 1 wherein the hydrogen peroxide is added to the steam by spraying prior to supplying the steam to the first turbine.
Claim 4
Dependent Claim
24 words
The method of claim 1 wherein the hydrogen peroxide is added in a concentration of 25 to 50 parts per billion parts of steam.
Claim 5
Dependent Claim
24 words
The method of claim 3 wherein the hydrogen peroxide has a concentration of 1% to 5% immediately prior to being added to the steam.
Claim 6
Dependent Claim
41 words
The method of claim 1 further comprising the steps of: supplying the steam from the first turbine to a second turbine; and adding additional amounts of hydrogen peroxide to the steam immediately before the steam is supplied to the second turbine.
Claim 7
Dependent Claim
26 words
The method of claim 1 further comprising the step of: testing the concentration of the hydrogen peroxide in the steam immediately downstream of the first turbine.
Claim 8
Dependent Claim
42 words
The method of claim 1 wherein the hydrogen peroxide and the steam forms a film of water on the portions of the steam power plant to be protected with a concentration of between 100 to 200 parts per billion parts of water.
Claim 9
Dependent Claim
50 words
A steam power plant having corrosion prevention, comprising: means for generating a supply of steam; first turbine means for utilizing the supply of steam to produce power; and first means for adding hydrogen peroxide to the supply of steam before the steam is conducted away from the first turbine means.
Claim 10
Dependent Claim
50 words
A steam power plant having corrosion prevention, comprising: means for generating a supply of steam; first turbine means for utilizing the supply of steam to produce power; and first means for adding hydrogen peroxide to the supply of steam before the steam is conducted away from the first turbine means.
Claim 11
Dependent Claim
29 words
The steam power plant of claim 8 wherein the hydrogen peroxide is added to the steam in a concentration of 25 to 50 parts per billion parts of steam.
Claim 12
Dependent Claim
27 words
The steam power plant of claim 9 wherein the hydrogen peroxide has a concentration of between 1% to 5% immediately prior to being added to the steam.
Claim 13
Dependent Claim
54 words
The steam power plant of claim 8 further comprising: second turbine means for utilizing a supply of steam from the first turbine means to produce additional power; and second means for adding an additional amount of hydrogen peroxide to the supply of steam before the steam is conducted away from the second turbine means.
Claim 14
Dependent Claim
28 words
The steam power plant of claim 8 further comprising: means for testing the concentration of the hydrogen peroxide in the steam immediately downstream of the first turbine means.
Claim 15
Dependent Claim
41 words
The steam power plant of claim 8 wherein the hydrogen peroxide and the steam forms a film on the portions of the power plant to be protected with a concentration of between 100 to 200 parts per billion parts of water.
References Cited (Backward Citations)
US1666523A
Cited
FR1194742A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-10 | 1985-02-09 | 1985-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-10 | 1989-02-09 | 1989-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-10 | 1993-02-09 | 1993-08-11 | $7700.00 | Window Closed / Lapsed |