CN203308526U - Improved subcritical 300MW steam turbine nozzle block - Google Patents
Improved subcritical 300MW steam turbine nozzle block Download PDFInfo
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- CN203308526U CN203308526U CN2013203508702U CN201320350870U CN203308526U CN 203308526 U CN203308526 U CN 203308526U CN 2013203508702 U CN2013203508702 U CN 2013203508702U CN 201320350870 U CN201320350870 U CN 201320350870U CN 203308526 U CN203308526 U CN 203308526U
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- nozzle block
- steam
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- subcritical
- nozzle sets
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Abstract
An improved subcritical 300MW steam turbine nozzle block is used in an improvement project of a subcritical 300MW steam turbine of a certain model, wherein the improvement project includes improving regulating stage efficiency, lowering coal consumption and increasing power output of a unit. The improved subcritical 300MW steam turbine nozzle block is structurally characterized by being formed by machining a nozzle block forge piece as a whole and mainly comprising a nozzle block outer ring, a nozzle block inner ring, stator blades, a lock sheet, steam seal sheets, a packing sheet and other structures. According to the improved subcritical 300MW steam turbine nozzle block, the molded line of the stator blades and a meridian plane molded line are subjected to optimal design, the through-flow area of the nozzle block is optimally designed to be 188 cm2, EDM (spark erosion) machining means are adopted for machining a steam flow channel, and the machining process is improved at the same time. Five steam seal tooth lines are totally mounted on the top of a regulating stage rotor blade on the nozzle block. One steam seal tooth line is mounted at the root of a regulating stage rotor blade on the nozzle block inner ring, and another steam seal tooth line is mounted at a steam stopping hole. Each steam seal tooth line is of an inlaid structure. The radial clearance between the steam seal sheets is subjected to optimal design. The regulating stage efficiency is improved on the premise of guaranteeing safety. The improved subcritical 300MW steam turbine nozzle block is mainly used for improving the regulating stage efficiency, lowering the coal consumption and increasing the power output of the unit.
Description
Affiliated technical field
The utility model directly apply to the subcritical 300MW steam turbine of certain model the raising governing stage efficiency, reduce coal consumption, increase on the transformation project of unit output.
Background technique
The subcritical 300MW steam turbine of certain model, under its 5VWO operating mode, the design governing stage efficiency is 66.7%, and the actual motion governing stage efficiency is in 48% left and right, and under partial load condition, this efficiency is lower.Its basic reason is that nozzle sets stator blade molded line and meridian surface shape design are relatively backward, and the stator blade machining accuracy is on the low side, and the stator blade flow efficiency is low; The former design flow area of nozzle sets is excessive, under partial load condition during unit operation restriction loss excessive, governing stage efficiency is lower.
Summary of the invention
The utility model provides the subcritical 300MW nozzle of steam turbine of certain model group modification scheme, 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 improved subcritical 300MW nozzle of steam turbine group, by nozzle sets forging integral body, processed, mainly comprise the structures such as ring, stator blade, lock sheet, labyrinth strip, washer in nozzle sets outer shroud, nozzle sets, the governing stage movable vane leaf be installed on the nozzle sets outer shroud pushes up totally 5 road gland sealing gears, blade root place packing and resistance steam vent place packing are installed, each 1 road gland sealing gear in nozzle sets on ring.Described nozzle sets flow area optimal design is 188cm
2, this flow area can reduce restriction loss, improves governing stage efficiency.The gland sealing gear structure that adopts is inserted, this inserted gland sealing gear is arranged in the packing groove successively by labyrinth strip, washer, lock sheet three parts, rush riveting washer top, make assembly parts tight, then the lock sheet crimp, push down washer to fix this sleeve assembly, have from locked function, can bear larger pressure reduction.
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.
The accompanying drawing explanation
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 sets outer shrouds in figure, 2. ring in nozzle sets, 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, 12. stator blades, 13. pins, 14. nozzle boxs.
Embodiment
After buying nozzle sets forging, according to layout design, adopt FDM processing method processing steam flow channel, the machining accuracy of the molded line of Control Nozzle group stator blade (12) and meridian surface shape (8), utilize ring (2) in machined into nozzle sets outer shroud (1) and nozzle sets to arrive the layout design size.Cross-sectional view of the present utility model is shown in Fig. 1.
In embodiment illustrated in fig. 2, in nozzle sets outer shroud (1) and nozzle sets, ring (2) is connected with the nozzle box (14) of high-pressure inner cylinder by socket head screw (3), (4), then pack into pin (10), (13), prevent that socket head screw (3), (4) from rotating.The relevant position processing vapor sealing groove (11) of ring (2) in nozzle sets outer shroud (1) and nozzle sets, inlay gland sealing gear, wherein governing stage movable vane (9) leaf pushes up 5 road gland sealing gears, governing stage movable vane (9) the blade root place in nozzle sets on ring and each 1 road gland sealing gear of resistance steam vent place.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.Labyrinth strip and steam turbine rotating part form sealing configuration.
During assembling by labyrinth strip axial clearance A and radial clearance B, C, D, E repair to design load.
Particularly, new nozzle sets is optimized design to stator blade molded line and meridian surface shape, is 188cm to nozzle sets flow area optimal design
2, adopt EDM (spark erosion) manufacturing process processing steam flow channel, improved simultaneously processing technology, to guarantee machining accuracy and the quality of steam flow channel, improved the safety reliability of nozzle sets; The labyrinth strip radial clearance is optimized to design, improves under the premise that security is guaranteed governing stage efficiency.
Claims (3)
1. improved subcritical 300MW nozzle of steam turbine group, by nozzle sets forging integral body, processed, mainly comprise the structures such as ring, stator blade, lock sheet, labyrinth strip, washer in nozzle sets outer shroud, nozzle sets, it is characterized in that: the governing stage movable vane leaf be installed on the nozzle sets outer shroud pushes up totally 5 road gland sealing gears, is installed on the governing stage movable vane blade root packing on ring and resistance steam vent place each 1 road gland sealing gear of packing in nozzle sets.
2. nozzle sets according to claim 1, it is characterized in that: described nozzle sets flow area optimal design is 188cm
2, this area can reduce restriction loss, improves governing stage efficiency.
3. nozzle sets according to claim 1, it is characterized in that: the gland sealing gear structure that adopts is inserted, this inserted gland sealing gear is arranged in the packing groove successively by labyrinth strip, washer, lock sheet three parts, rush riveting washer top, make assembly parts tight, then the lock sheet crimp, push down washer to fix this sleeve assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203508702U CN203308526U (en) | 2013-06-19 | 2013-06-19 | Improved subcritical 300MW steam turbine nozzle block |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203508702U CN203308526U (en) | 2013-06-19 | 2013-06-19 | Improved subcritical 300MW steam turbine nozzle block |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203308526U true CN203308526U (en) | 2013-11-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013203508702U Expired - Lifetime CN203308526U (en) | 2013-06-19 | 2013-06-19 | Improved subcritical 300MW steam turbine nozzle block |
Country Status (1)
| Country | Link |
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| CN (1) | CN203308526U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104153824A (en) * | 2014-07-25 | 2014-11-19 | 江苏金通灵流体机械科技股份有限公司 | Multistage air seal structure of turbine |
| CN109611164A (en) * | 2018-10-24 | 2019-04-12 | 大唐陕西发电有限公司 | A kind of method of steam-turbine unit Tong Liao area |
| CN112901284A (en) * | 2021-01-19 | 2021-06-04 | 沂源县华阳能源设备有限公司 | Novel adjusting sheath |
-
2013
- 2013-06-19 CN CN2013203508702U patent/CN203308526U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104153824A (en) * | 2014-07-25 | 2014-11-19 | 江苏金通灵流体机械科技股份有限公司 | Multistage air seal structure of turbine |
| CN104153824B (en) * | 2014-07-25 | 2016-05-04 | 江苏金通灵流体机械科技股份有限公司 | The multistage air seal structure of turbine |
| CN109611164A (en) * | 2018-10-24 | 2019-04-12 | 大唐陕西发电有限公司 | A kind of method of steam-turbine unit Tong Liao area |
| CN112901284A (en) * | 2021-01-19 | 2021-06-04 | 沂源县华阳能源设备有限公司 | Novel adjusting sheath |
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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 | ||
| 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. |
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| DD01 | Delivery of document by public notice | ||
| DD01 | Delivery of document by public notice |
Addressee: Chen Yuandong Document name: Notification of eligibility |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131127 |