CN111173576A - Steam turbine - Google Patents
Steam turbine Download PDFInfo
- Publication number
- CN111173576A CN111173576A CN202010044792.8A CN202010044792A CN111173576A CN 111173576 A CN111173576 A CN 111173576A CN 202010044792 A CN202010044792 A CN 202010044792A CN 111173576 A CN111173576 A CN 111173576A
- Authority
- CN
- China
- Prior art keywords
- pressure
- inner cylinder
- steam turbine
- nickel
- alloy
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/24—Casings; Casing parts, e.g. diaphragms, casing fastenings
- F01D25/26—Double casings; Measures against temperature strain in casings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2300/00—Materials; Properties thereof
- F05D2300/10—Metals, alloys or intermetallic compounds
- F05D2300/17—Alloys
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2300/00—Materials; Properties thereof
- F05D2300/10—Metals, alloys or intermetallic compounds
- F05D2300/17—Alloys
- F05D2300/171—Steel alloys
Abstract
The invention provides a steam turbine which comprises a high-pressure inner cylinder and a high-pressure outer cylinder, wherein the high-pressure inner cylinder is made of a martensite material, a lining layer with the thickness of 0.1-1 mm is arranged on the surface of the inner wall of the high-pressure inner cylinder, and the lining layer is made of a nickel-based alloy. According to the steam turbine, the inner liner layer with the thickness of 0.1-1 mm is arranged on the surface of the inner wall of the high-pressure inner cylinder, and the inner liner layer is made of the nickel-based alloy, so that the mechanical strength and the steam oxidation resistance of the high-pressure inner cylinder under the high-temperature condition are improved, and the allowable temperature of the steam turbine is increased.
Description
Technical Field
The invention relates to the field of power equipment, in particular to a steam turbine.
Background
The double-layer cylinder structure is generally adopted in the existing large-scale steam turbine, the double-layer cylinder structure comprises a high-pressure inner cylinder and a high-pressure outer cylinder, the inner wall of the inner cylinder is in direct contact with high-temperature steam, the outer wall of the outer cylinder is in contact with the environment, an interlayer is arranged between the inner cylinder and the outer cylinder, the interlayer is filled with steam with slightly lower temperature and pressure, the inner cylinder only needs to bear the differential pressure between working steam and interlayer steam, the wall thickness can be obviously reduced, the temperature difference between the temperature of the inner wall of the inner cylinder and the temperature of the outer wall (interlayer) is reduced, and the generation of larger. The outer cylinder bears the differential pressure between the interlayer and the environment, but the working temperature is medium temperature, the allowable application of materials is high, and cheap low alloy steel or even carbon steel can be adopted, so the wall thickness of the outer cylinder can be effectively controlled. The allowable temperature of CB2 steel and 9 Cr-3W-3 Co heat-resistant steel adopted by the conventional high-pressure inner cylinder does not exceed 625 ℃, and after the allowable temperature is exceeded, the material of the high-pressure inner cylinder cannot meet the requirement of steam side oxidation resistance.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a steam turbine.
In order to achieve the purpose, the invention adopts the technical scheme that: the steam turbine comprises a high-pressure inner cylinder and a high-pressure outer cylinder, wherein the high-pressure inner cylinder is made of a martensite material, a 0.1-1 mm inner liner layer is arranged on the surface of the inner wall of the high-pressure inner cylinder, and the inner liner layer is made of a nickel-based alloy.
According to the steam turbine, the inner liner layer with the thickness of 0.1-1 mm is arranged on the surface of the inner wall of the high-pressure inner cylinder, and the material of the inner liner layer is made of the nickel-based alloy, so that the mechanical strength and the steam oxidation resistance of the high-pressure inner cylinder under the high-temperature condition are improved, and the allowable temperature of the steam turbine is increased.
Preferably, the nickel-based alloy is a Ni-Cu alloy, a Ni-Cr alloy, a Ni-Mo alloy, a Ni-Cr-Mo alloy, or a Ni-Cr-Mo-Cu alloy.
Preferably, the nickel-based alloy is an already commercialized Inconel 740H nickel-based alloy, Inconel 617 nickel-based alloy, Inconel 625 nickel-based alloy, or Nimonic 263 nickel-based alloy.
Preferably, the thickness of the lining layer is 0.2-0.8 mm.
The inventor finds that when the thickness of the inner liner of the high-pressure inner cylinder is 0.2-0.8 mm, the mechanical strength and the steam oxidation resistance of the high-pressure inner cylinder under the high-temperature condition are better, and the allowable temperature of a steam turbine is higher.
Preferably, the thickness of the inner liner layer is 0.4-0.6 mm.
The inventor finds that when the thickness of the inner liner of the high-pressure inner cylinder is 0.4-0.6 mm, the mechanical strength and the steam oxidation resistance of the high-pressure inner cylinder under the high-temperature condition are better, and the allowable temperature of a steam turbine is higher.
Preferably, the martensitic material is CB2(ZG13Cr9Mo2Co1NiVNbNB) steel or 9 Cr-3W-3 Co heat resistant steel.
Preferably, the lining layer is formed on the surface of the inner wall of the high-pressure inner cylinder through a thermal spraying or surfacing process.
The nickel-based alloy lining can adopt a thermal spraying or surfacing process, the thermal spraying is quick in automatic construction, and the construction can be better carried out on complex contours; the build-up welding construction speed will be slower.
The invention has the beneficial effects that: according to the steam turbine, the inner lining layer with the thickness of 0.1-1 mm is arranged on the surface of the inner wall of the high-pressure inner cylinder, the material of the inner lining layer is made of nickel-based alloy, the mechanical strength and the steam oxidation resistance of the high-pressure inner cylinder under the high-temperature condition are improved, and the allowable temperature of the steam turbine is increased.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific examples.
Example 1
The steam turbine provided by the embodiment of the invention comprises a high-pressure inner cylinder and a high-pressure outer cylinder, wherein the high-pressure inner cylinder is made of a martensite material, a lining layer with the thickness of 0.1mm is arranged on the surface of the inner wall of the high-pressure inner cylinder, the lining layer is made of a nickel-based alloy, the martensite material is CB2 steel, the nickel-based alloy is a Ni-Cr alloy, and the lining layer is formed on the surface of the inner wall of the high-pressure inner cylinder through a thermal spraying process.
Example 2
The steam turbine provided by the embodiment of the invention comprises a high-pressure inner cylinder and a high-pressure outer cylinder, wherein the high-pressure inner cylinder is made of a martensite material, a lining layer with the thickness of 0.2mm is arranged on the surface of the inner wall of the high-pressure inner cylinder, the lining layer is made of a nickel-based alloy, the martensite material is CB2 steel, the nickel-based alloy is a Ni-Cr alloy, and the lining layer is formed on the surface of the inner wall of the high-pressure inner cylinder through a thermal spraying process.
Example 3
The steam turbine provided by the embodiment of the invention comprises a high-pressure inner cylinder and a high-pressure outer cylinder, wherein the high-pressure inner cylinder is made of a martensite material, a lining layer with the thickness of 0.4mm is arranged on the surface of the inner wall of the high-pressure inner cylinder, the lining layer is made of a nickel-based alloy, the martensite material is CB2 steel, the nickel-based alloy is a Ni-Cr alloy, and the lining layer is formed on the surface of the inner wall of the high-pressure inner cylinder through a thermal spraying process.
Example 4
The steam turbine provided by the embodiment of the invention comprises a high-pressure inner cylinder and a high-pressure outer cylinder, wherein the high-pressure inner cylinder is made of a martensite material, a lining layer with the thickness of 0.6mm is arranged on the surface of the inner wall of the high-pressure inner cylinder, the lining layer is made of a nickel-based alloy, the martensite material is CB2 steel, the nickel-based alloy is a Ni-Cr alloy, and the lining layer is formed on the surface of the inner wall of the high-pressure inner cylinder through a thermal spraying process.
Example 5
The steam turbine provided by the embodiment of the invention comprises a high-pressure inner cylinder and a high-pressure outer cylinder, wherein the high-pressure inner cylinder is made of a martensite material, a lining layer with the thickness of 0.8mm is arranged on the surface of the inner wall of the high-pressure inner cylinder, the lining layer is made of a nickel-based alloy, the martensite material is CB2 steel, the nickel-based alloy is a Ni-Cr alloy, and the lining layer is formed on the surface of the inner wall of the high-pressure inner cylinder through a thermal spraying process.
Example 6
The steam turbine provided by the embodiment of the invention comprises a high-pressure inner cylinder and a high-pressure outer cylinder, wherein the high-pressure inner cylinder is made of a martensite material, a lining layer with the thickness of 1mm is arranged on the surface of the inner wall of the high-pressure inner cylinder, the lining layer is made of a nickel-based alloy, the martensite material is CB2 steel, the nickel-based alloy is Ni-Cr alloy, and the lining layer is formed on the surface of the inner wall of the high-pressure inner cylinder through a thermal spraying process.
Comparative example 1
The steam turbine provided by the embodiment of the invention comprises a high-pressure inner cylinder and a high-pressure outer cylinder, wherein the high-pressure inner cylinder is made of a martensite material, a lining layer with the thickness of 1.5mm is arranged on the surface of the inner wall of the high-pressure inner cylinder, the lining layer is made of a nickel-based alloy, the martensite material is CB2 steel, and the nickel-based alloy is formed on the surface of the inner wall of the high-pressure inner cylinder through a thermal spraying process.
The inventor discovers through research that the inner wall surface of the inner cylinder of the high pressure of the steam turbine is provided with the inner lining layer of 0.1-1 mm, the inner lining layer is made of nickel-based alloy, and compared with the steam turbine without the inner lining layer, the inner cylinder of the high pressure has better steam oxidation resistance under the high temperature condition, the allowable temperature of the steam turbine is higher, and the allowable temperature can reach more than 650 ℃.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (6)
1. The steam turbine is characterized by comprising a high-pressure inner cylinder and a high-pressure outer cylinder, wherein the high-pressure inner cylinder is made of a martensite material, a lining layer with the thickness of 0.1-1 mm is arranged on the surface of the inner wall of the high-pressure inner cylinder, and the lining layer is made of a nickel-based alloy.
2. The steam turbine of claim 1, wherein the nickel-based alloy is a Ni-Cu alloy, a Ni-Cr alloy, a Ni-Mo alloy, a Ni-Cr-Mo alloy, or a Ni-Cr-Mo-Cu alloy.
3. The turbine according to claim 1 wherein the thickness of the inner liner is 0.2 to 0.8 mm.
4. The turbine according to claim 3 wherein the thickness of the inner liner is 0.4 to 0.6 mm.
5. The turbine of claim 1 wherein the martensitic material is CB2 steel or 9 Cr-3W-3 Co heat resistant steel.
6. The turbine according to claim 1 wherein the inner liner is formed on the inner wall surface of the high pressure inner casing by a thermal spray or a bead weld process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010044792.8A CN111173576A (en) | 2020-01-15 | 2020-01-15 | Steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010044792.8A CN111173576A (en) | 2020-01-15 | 2020-01-15 | Steam turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111173576A true CN111173576A (en) | 2020-05-19 |
Family
ID=70658095
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010044792.8A Pending CN111173576A (en) | 2020-01-15 | 2020-01-15 | Steam turbine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111173576A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1123338A (en) * | 1994-02-22 | 1996-05-29 | 株式会社日立制作所 | Steam-turbine power plant and steam turbine |
| JP2009127515A (en) * | 2007-11-22 | 2009-06-11 | Toshiba Corp | High-temperature steam turbine |
| CN101779004A (en) * | 2007-08-08 | 2010-07-14 | 西门子公司 | Method for producing a turbine housing and turbine housing |
-
2020
- 2020-01-15 CN CN202010044792.8A patent/CN111173576A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1123338A (en) * | 1994-02-22 | 1996-05-29 | 株式会社日立制作所 | Steam-turbine power plant and steam turbine |
| CN101779004A (en) * | 2007-08-08 | 2010-07-14 | 西门子公司 | Method for producing a turbine housing and turbine housing |
| JP2009127515A (en) * | 2007-11-22 | 2009-06-11 | Toshiba Corp | High-temperature steam turbine |
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|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200519 |
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| RJ01 | Rejection of invention patent application after publication |