CN202718710U - Subcritical 600 million watt (MW) steam turbine nozzle - Google Patents
Subcritical 600 million watt (MW) steam turbine nozzle Download PDFInfo
- Publication number
- CN202718710U CN202718710U CN 201220364762 CN201220364762U CN202718710U CN 202718710 U CN202718710 U CN 202718710U CN 201220364762 CN201220364762 CN 201220364762 CN 201220364762 U CN201220364762 U CN 201220364762U CN 202718710 U CN202718710 U CN 202718710U
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- China
- Prior art keywords
- nozzle
- subcritical
- steam turbine
- gland sealing
- generator set
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- 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.)
- Expired - Lifetime
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Abstract
A subcritical 600 million watt (MW) steam turbine nozzle is used in a renovation project of saving energy, reducing consumption and enlarging the output capacity of a generator set of a subcritical 600 MW steam turbine generator set. The subcritical 600 MW steam turbine nozzle is structurally characterized in that a regulating stage movable vane blade tip steam seal installed on a nozzle is provided with three paths of sealing teeth, each path of the sealing teeth is of an inlaid structure, the method of milling machining is adopted on separations between segmental arcs of the nozzle, processing technic is improved, reliability of the safety of the nozzle is improved, molded lines of blades of the nozzle and a meridian plane are optimized, and the area of an outlet of the nozzle is optimized. The subcritical 600 MW steam turbine nozzle is mainly used for improving the efficiency of the regulating stage, reducing coal consumption and increasing the output of the generator set.
Description
Technical field
The utility model directly applies to saving energy and reduce the cost, increasing on the transformation project of unit output of subcritical 600MW steam turbine set.
Background technique
The governing stage design efficiency of subcritical 600MW steam turbine is 69% left and right, and the actual operating efficiency of most of units is in 50% left and right, and efficient is obviously on the low side.Its reason is that nozzle vane molded line and meridian surface shape aeroperformance are relatively poor, and machining accuracy is not high, and blade efficiency is low; Exit area of nozzle is excessive, during unit operation restriction loss excessive, Efficiency Decreasing is more.
Summary of the invention
The utility model provides the modification scheme of subcritical 600MW nozzle of steam turbine, to improve governing stage efficiency, reduces coal consumption, increases unit output.
The technological scheme that its technical problem that solves the utility model adopts is: a kind of subcritical 600MW nozzle of steam turbine, be installed on the governing stage movable vane blade tip seal totally 3 road gland sealing gears on nozzle block body, and the per pass gland sealing gear is embedded structure; The mode of milling processing is adopted in isolation between each nozzle segment.Described 3 road gland sealing gears, 2 road gland sealing gears of close nozzle steam output side are low tooth, another 1 road gland sealing gear is high tooth.The gland sealing gear structure that adopts is inserted, and this inserted gland sealing gear is made of labyrinth strip, washer, lock sheet three parts, has from locked function, can bear larger pressure reduction.Riveting washer top is rushed in the installation of the gland sealing gear that adopts after labyrinth strip, washer and lock sheet are arranged in the packing groove, make assembly parts tight, then the lock sheet crimp, pushes down washer to fix this sleeve assembly.
Particularly, new nozzle is optimized nozzle vane molded line and meridian surface shape, exit area of nozzle is optimized, employing EDM(spark erosion) manufacturing process is to guarantee nozzle vane machining accuracy and quality, milling method is adopted in isolation between each nozzle segment, improve processing technology, improved the safety reliability of nozzle, suitably adjusted the packing radial clearance.
The beneficial effects of the utility model are to make steam turbine set reach the raising governing stage efficiency, reduction coal consumption, the purpose of increase unit output.
Description of drawings
Below in conjunction with drawings and Examples, the utility model is further illustrated.
Fig. 1 is cross-sectional view of the present utility model.
Fig. 2 be the utility model in actual applications and the correlation schematic diagram between governing stage movable vane and nozzle box.
1. nozzle block bodies in figure, 2. pin, 3. socket head screw, 4. socket head screw, 5. lock sheet, 6. labyrinth strip, 7. washer, 8 meridian surface shapes, 9. governing stage movable vane, 10. pin, 11. packing grooves.
Embodiment
After the buying blank, according to layout design, adopt EDM processing method working nozzle runner, the machining accuracy of Control Nozzle vane type line and meridian surface shape (8) utilizes machined into nozzle block body (1) to the layout design size.Cross-sectional view of the present utility model is seen Fig. 1.
In embodiment illustrated in fig. 2, nozzle block body (1) is connected with inner casing by socket head screw (3) (4), and the pin of then packing into (2) (10) prevents that socket head screw (3) (4) from rotating.At the upper processing vapor sealing groove of nozzle block body (1), inlay gland sealing gear, governing stage movable vane (9) top 3 road gland sealing gears wherein, nozzle sets root 2 road gland sealing gears.The installation of gland sealing gear: after being arranged on labyrinth strip (6), lock sheet (5) and washer (7) in packing groove (11), rush riveting washer (7) top, make this sleeve assembly tight, then lock sheet (5) crimp, push down washer (7) to fix this sleeve assembly.Gland sealing gear and steam turbine rotating part form sealing configuration.
During assembling with gland sealing gear axial clearance A and radial clearance C, D, E repair to design load.
Claims (1)
1. subcritical 600MW nozzle of steam turbine is characterized in that: be installed on the governing stage movable vane blade tip seal totally 3 road gland sealing gears on nozzle, the mode of milling processing is adopted in the isolation between each nozzle segment.
2. nozzle according to claim 1 is characterized in that: described 3 road gland sealing gears, be low tooth near 2 road gland sealing gears of nozzle steam output side, and another 1 road gland sealing gear is high tooth.
3. nozzle according to claim 1, it is characterized in that: the gland sealing gear structure that adopts is inserted, this inserted gland sealing gear is made of labyrinth strip, washer, lock sheet three parts, has from locked function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220364762 CN202718710U (en) | 2012-07-26 | 2012-07-26 | Subcritical 600 million watt (MW) steam turbine nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220364762 CN202718710U (en) | 2012-07-26 | 2012-07-26 | Subcritical 600 million watt (MW) steam turbine nozzle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202718710U true CN202718710U (en) | 2013-02-06 |
Family
ID=47620536
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220364762 Expired - Lifetime CN202718710U (en) | 2012-07-26 | 2012-07-26 | Subcritical 600 million watt (MW) steam turbine nozzle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202718710U (en) |
-
2012
- 2012-07-26 CN CN 201220364762 patent/CN202718710U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 100044 18th floor, Fangyuan building, No.56, Zhongguancun South Street, Haidian District, Beijing Patentee after: Beijing Guoneng Longwei Power Generation Technology Co.,Ltd. Address before: 100044 18th floor, Fangyuan building, No.56, Zhongguancun South Street, Haidian District, Beijing Patentee before: BEIJING LONGWEI POWER GENERATION TECHNOLOGY Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130206 |
|
| CX01 | Expiry of patent term |