CN203856516U - Saturated steam turbine last-stage hollow stationary blade - Google Patents
Saturated steam turbine last-stage hollow stationary blade Download PDFInfo
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- CN203856516U CN203856516U CN201420140340.XU CN201420140340U CN203856516U CN 203856516 U CN203856516 U CN 203856516U CN 201420140340 U CN201420140340 U CN 201420140340U CN 203856516 U CN203856516 U CN 203856516U
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- blade
- steam turbine
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- saturated steam
- cavity
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- 229920006395 saturated elastomer Polymers 0.000 title claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000010276 construction Methods 0.000 claims description 6
- 230000008602 contraction Effects 0.000 claims description 3
- 230000003628 erosive effect Effects 0.000 abstract description 7
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000007791 dehumidification Methods 0.000 abstract 3
- 238000010586 diagram Methods 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 229910001347 Stellite Inorganic materials 0.000 description 2
- AHICWQREWHDHHF-UHFFFAOYSA-N chromium;cobalt;iron;manganese;methane;molybdenum;nickel;silicon;tungsten Chemical compound C.[Si].[Cr].[Mn].[Fe].[Co].[Ni].[Mo].[W] AHICWQREWHDHHF-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Landscapes
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The utility model discloses a saturated steam turbine last-stage hollow stationary blade, and relates to a saturated steam turbine blade technology and a dehumidification technology. The molded line part of the blade is provided with a variable-cross-section twisted blade, and good pneumatic performance and intensity performance are achieved. The pressure surface of the blade is provided with two rows of dehumidification grooves, and condensed water drops in steam can effectively enter a cavity of the blade through the dehumidification grooves, so the water drops directly causing erosion on a moving blade are greatly reduced, and the safety of the blade is improved. The saturated steam turbine last-stage hollow stationary blade can be applied under the condition that the steam humidity is 0 to 17 percent.
Description
Technical field
The utility model relates to steam turbine technology, is specifically related to a kind of saturated steam turbine last stage hollow stationary blade.
Background technique
Saturated last stage vane of steam turbine has been born higher the exerting oneself of steam turbine, simultaneously in the larger working environment of steam moisture, steam turbine overall efficiency is had a significant impact.Final stage stator blade adopts hollow blade and discharges wet sump from pressure side, can effectively remove the contained condensing water droplet of devaporation, reduce the erosion of condensing water droplet to movable vane, also can improve the mechanical efficiency of steam in final stage, be one of effective ways that improve steam turbine stability and efficiency simultaneously.
Because each manufactory of current saturated vapour turbine all adopts the passive protection measure such as final stage moving blade surface peening or embedded alloy sheet, fundamentally do not solve the problem of moving vane water erosion; And condensing water droplet in steam also makes final stage decrease in efficiency, cause very large wet steam loss; In addition, the admission of saturated vapour turbine is saturated vapour, final stage moving blade is for a long time in the larger wet-steam region operation of humidity, water erosion problem is much more serious than conventional steam turbine, so extensively adopt at present stellite alloy film to prevent water erosion, but stellite alloy film Profile Design obtains the unreasonable weld joint that makes and very easily ftractures, have a strong impact on blade strength and steam turbine operation safety, these are all the current problem demanding prompt solutions of industry Nei Ge institute and R&D institution.
Model utility content
The purpose of this utility model is to provide a kind of saturated steam turbine last stage hollow stationary blade, can ensure that saturated vapour turbine moves safely and reliably, increases work efficiency, to solve existing saturated last stage vane of steam turbine inefficiency, the poor problem of job security.
The saturated steam turbine last stage hollow stationary blade the utility model proposes comprises: blade, cavity, except wet sump, vane type line is that variable cross section reverses shape, increased gradually to top cross-section is long-pending by root along blade height, between adjacent two sections, there is torsion, blade interior is cavity structure, except wet sump is two row discontinuous constructions, parallel with lagging edge, between blade and cavity, minimum wall thickness (MINI W.) is more than or equal to 4mm, blade minimum thickness is more than or equal to 8mm, remove wet sump and blade surface and be tangentially 45° angle, make water droplet can freely enter cavity inside, and steam can not freely enter cavity, reach the object of effective separate water droplets and steam.
Preferably, the height H 1 of vane type line part is 449mm, and the root axial width B1 of vane type line part is 70mm, and the top axle of vane type line part is 110mm to width B 2.
Preferably, the cross section geometric data of vane type line part from root to top are: root section B-B is 0～449mm to the depth of section of top cross-section L-L, axial width B is 70～110mm, chord length b is 95.778～143.341mm, how much flow outlet angles are 19.396 °～23.383 °, established angle is 47.866 °～51.094 °, and blade profile sectional area is 11.6897～26.1854cm
2, maximum ga(u)ge O is 22.369～33.479mm, trailing edge thickness δ is 0.488～0.730mm.
Preferably, root of blade, middle part and top are contraction passage leaf grating.
Preferably, it is 8～12mm that blade pressure surface two row remove span distance between wet sump, and axial distance is 5～15mm.Two row are 15～25mm except wet sump overhead height is poor.Every row remove wet sump and are made up of five sections of dehumidifying rectangle grooves that connect with cavity, and every section of dehumidifying rectangle groove length is 15～25mm, and axial width is 2～3mm.
The utility model has the advantages that: 1) blade of the present utility model adopts hollow-core construction, can effectively remove condensing water droplet, reduce wet steam loss, improve unit efficiency; 2) blade, under different operating condition, organically combines the Security of this blade and high efficiency, ensures that this blade has good Study on Variable Condition Features, and unit, under variable working condition, also can move efficiently and safely; 3) the utility model adopts casting cavity structure, ensures blade strength; 4) the utility model adopts ten sections of discontinuous dehumidifying rectangle groove composition two row except wet sump, does not affect structure stability, thereby has ensured the Security of operation; 5) the utility model is to be collected to condensing water droplet in cavity except wet sump method, greatly reduce the condensing water droplet quantity that movable vane is produced to water erosion effect, not only improve the safety in operation of movable vane, also reduced the wet steam loss of final stage, thereby improved stage efficiency.
Brief description of the drawings
Fig. 1 is the overall structure schematic diagram of saturated steam turbine last stage hollow stationary blade of the present utility model;
Fig. 2 is the plan view of saturated steam turbine last stage hollow stationary blade shown in Fig. 1;
Fig. 3 is blade profile geometrical construction schematic diagram;
Fig. 4 is that the utility model removes wet sump structural drawing, and wherein Fig. 4 (a), Fig. 4 (b), Fig. 4 (c) are respectively top plan view, partial enlarged drawing and side direction view;
Fig. 5 is the superimposed figure of vane type line, B-B, and G-G, L-L represents cross section number.
Embodiment
For the purpose of this utility model, technological scheme and advantage are more clearly illustrated, below in conjunction with specific embodiment, and with reference to accompanying drawing, the utility model is further described.
The utility model combines many-sided influence factor such as interference and blade strength that the fluid situations of final stage stator blade, flowing to Two-phase Steam Flows, steam condensation, stator blade tail in moving vane leaf grating, the interference of Secondary Flow, shock wave and boundary layer form between Secondary Flow and carries out comprehensive assessment analysis, has solved to a certain extent the problems such as the existing water erosion of existing saturated last stage vane of steam turbine is serious, job security is poor, efficiency is low.
Fig. 1 is the overall structure schematic diagram of a kind of saturated steam turbine last stage hollow stationary blade of the present utility model; Fig. 2 is the plan view of Fig. 1; Fig. 3 is blade profile geometrical construction schematic diagram; Fig. 5 is the superimposed figure of vane type line, B-B, and G-G, L-L represents cross section number.
Referring to Fig. 1～3 and Fig. 5, the saturated steam turbine last stage hollow stationary blade the utility model proposes comprises blade 1, cavity 2, removes wet sump 3.Blade 1 molded line is that variable cross section reverses shape, is increased gradually by root to top along blade 1 short transverse section area, between adjacent two sections, has torsion, and blade 1 root, middle part and top are contraction passage leaf grating; Blade interior is cavity structure 2; Except wet sump 3 is two row discontinuous constructions, parallel with lagging edge.Between blade 1 and cavity 2, minimum wall thickness (MINI W.) is more than or equal to 4mm, and blade minimum thickness is more than or equal to 8mm; Except wet sump 3 and blade 2 surfaces are tangentially 45° angle, make water droplet can freely enter cavity inside, and steam can not freely enter cavity, has effectively separated water droplet and steam.
Fig. 4 is for removing wet sump structural drawing.As shown in Figure 4, the distance W 1 of two row dehumidifying slot pitch lagging edges is respectively 40～50mm, 50～60mm with the scope of W2, and the scope of dehumidifying rectangle groove axial width W3 is 2～3mm, and in dehumidifying rectangle groove, side and blade surface included angle A 3 are between 42～47 °.
Particularly, the molded line part of blade 1 is that variable cross section reverses shape, and the molded line part of blade 1 is reduced gradually by root to the section area at top, between adjacent two sections, has torsion.The molded line Partial Height of blade 1 is 449mm, and the root axial width (B1) of blade 1 molded line part is 70mm, and the top axial width (B2) of blade 1 molded line part is 110mm.The cross section geometric data of blade 1 molded line part from root to top are: root section (B-B) is 0～449mm to the depth of section of top cross-section (L-L), axial width B is 70～110mm, chord length b is 95.778～143.341mm, how much flow outlet angles are 19.396 °～23.383 °, established angle is 47.866 °～51.094 °, and blade profile section area is 11.6897～26.1854cm
2, maximum ga(u)ge (O) is 22.369～33.479mm, trailing edge thickness (δ) is 0.488～0.730mm.As shown in Figure 4, shown in Fig. 4 (a), be that blade surface removes wet sump schematic diagram, shown in Fig. 4 (b), be except wet sump structure enlarged view, shown in Fig. 4 (c), be except wet sump lateral plan.
On blade pressure surface, except wet sump (2) has two row, every row are made up of five sections of dehumidifying rectangle grooves.Every section of dehumidifying rectangle groove length is 15～25mm, and axial width is 2～3mm; Between adjacent two sections of dehumidifying rectangle grooves, span distance is 8～12mm, and axial distance is 5～15mm.Two row are 15～25mm except wet sump overhead height is poor.
In the present embodiment, the quantity of hollow stationary blade is 64.
Blade 1 of the present utility model adopts ten sections of dehumidifying square groove composition two row except wet sump, has ensured the strength characteristics of blade structure, and two row have ensured good effect on moisture extraction except wet sump is interspersed; Condensing water droplet is drained by entering cavity except wet sump, thereby has improved the Security of operation.The strengthening variable cross section twisting blade profile adopting, rationally controls the ways such as blade 1 surface and radial pressure distribution, and the Security of this blade 1 and high efficiency are organically combined.By the comprehensive analysis and optimization under different humidity condition, and consider the relative movement of condensing water droplet and steam, make this blade 1 there is higher Study on Variable Condition Features, except wet sump all can effectively be removed the moisture content that condenses under different operating modes, thereby ensure that unit is under different operating modes, also can effectively remove condensing water droplet, safety, operation efficiently.Blade 1 of the present utility model has considered that humidity reaches 17% operating mode, and under this limited conditions, condensing water droplet also can enter in cavity by removing wet sump effectively, and steam only has minute quantity to enter cavity in company with condensing water droplet.Thereby ensure that blade is stable under different operating modes, safe, efficiently operation.
Each cross section design parameter is in table 1:
Above-described specific embodiment; the purpose of this utility model, technological scheme and beneficial effect have been carried out describing in detail further; institute is understood that; the foregoing is only specific embodiment of the utility model; be not limited to the utility model; all within spirit of the present utility model and principle, any amendment of making, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.
Claims (5)
1. a saturated steam turbine last stage hollow stationary blade, comprise blade (1), cavity (2), except wet sump (3), blade (1) molded line is that variable cross section reverses shape, increased gradually to top cross-section is long-pending by root along blade (1) height, between adjacent two sections, there is torsion, blade (1) inside is cavity structure (2), except wet sump (3) is two row discontinuous constructions, parallel with lagging edge, it is characterized in that: between blade (1) and cavity (2), minimum wall thickness (MINI W.) is more than or equal to 4mm, blade (1) minimum thickness is more than or equal to 8mm, except wet sump (3) and blade (2) surface are tangentially 45° angle, make water droplet can freely enter cavity (2) inside, and steam can not freely enter cavity, reach the object of effective separate water droplets and steam.
2. saturated steam turbine last stage hollow stationary blade according to claim 1, it is characterized in that: the height H 1 of described blade (1) molded line part is 449mm, the root axial width B1 of blade (1) molded line part is 70mm, and the top axle of blade (1) molded line part is 110mm to width B 2.
3. saturated steam turbine last stage hollow stationary blade according to claim 2, it is characterized in that: the cross section geometric data of blade (1) molded line part from root to top are: root section B-B is 0～449mm to the depth of section of top cross-section L-L, axial width B is 70～110mm, chord length b is 95.778～143.341mm, how much flow outlet angles are 19.396 °～23.383 °, established angle is 47.866 °～51.094 °, and blade profile sectional area is 11.6897～26.1854cm
2, maximum ga(u)ge O is 22.369～33.479mm, trailing edge thickness δ is 0.488～0.730mm.
4. saturated steam turbine last stage hollow stationary blade according to claim 1, is characterized in that: described blade (1) root, middle part and top are contraction passage leaf grating.
5. saturated steam turbine last stage hollow stationary blade according to claim 1, it is characterized in that: it is 8～12mm that described blade pressure surface two row remove span distance between wet sump (2), axial distance is 5～15mm, two row are 15～25mm except wet sump overhead height is poor, every row remove wet sump and are made up of five sections of dehumidifying rectangle grooves that connect with cavity (2), every section of dehumidifying rectangle groove length is 15～25mm, and axial width is 2～3mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420140340.XU CN203856516U (en) | 2014-03-26 | 2014-03-26 | Saturated steam turbine last-stage hollow stationary blade |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420140340.XU CN203856516U (en) | 2014-03-26 | 2014-03-26 | Saturated steam turbine last-stage hollow stationary blade |
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| CN203856516U true CN203856516U (en) | 2014-10-01 |
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| CN201420140340.XU Expired - Lifetime CN203856516U (en) | 2014-03-26 | 2014-03-26 | Saturated steam turbine last-stage hollow stationary blade |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105298555A (en) * | 2015-11-04 | 2016-02-03 | 山东翰飞电力科技有限公司 | Pure-condensation-high-back-pressure circulating water heat supply dual-mode single-rotor steam turbine and system thereof |
| CN105697071A (en) * | 2014-12-15 | 2016-06-22 | 三菱日立电力系统株式会社 | Steam Turbine Stationary Blade |
| CN107965352A (en) * | 2017-12-26 | 2018-04-27 | 北京全四维动力科技有限公司 | The bent blades of water erosion danger, leaf grating and industrial steam turbine using it can be reduced |
| CN113153458A (en) * | 2021-04-16 | 2021-07-23 | 西安交通大学 | Dynamic testing system and method for stationary blade heating and dehumidification |
-
2014
- 2014-03-26 CN CN201420140340.XU patent/CN203856516U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105697071A (en) * | 2014-12-15 | 2016-06-22 | 三菱日立电力系统株式会社 | Steam Turbine Stationary Blade |
| CN105697071B (en) * | 2014-12-15 | 2018-03-27 | 三菱日立电力系统株式会社 | steam turbine stationary blade |
| US10132178B2 (en) | 2014-12-15 | 2018-11-20 | Mitsubishi Hitachi Power Systems, Ltd. | Steam turbine stationary blade |
| CN105298555A (en) * | 2015-11-04 | 2016-02-03 | 山东翰飞电力科技有限公司 | Pure-condensation-high-back-pressure circulating water heat supply dual-mode single-rotor steam turbine and system thereof |
| CN107965352A (en) * | 2017-12-26 | 2018-04-27 | 北京全四维动力科技有限公司 | The bent blades of water erosion danger, leaf grating and industrial steam turbine using it can be reduced |
| CN113153458A (en) * | 2021-04-16 | 2021-07-23 | 西安交通大学 | Dynamic testing system and method for stationary blade heating and dehumidification |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20141001 |
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| CX01 | Expiry of patent term |