CN104196573A - Low-pressure last stage blade of rotating speed-variable air cooling industrial steam turbine with steam exhaust area of 3.6 m2 - Google Patents
Low-pressure last stage blade of rotating speed-variable air cooling industrial steam turbine with steam exhaust area of 3.6 m2 Download PDFInfo
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- CN104196573A CN104196573A CN201410358975.1A CN201410358975A CN104196573A CN 104196573 A CN104196573 A CN 104196573A CN 201410358975 A CN201410358975 A CN 201410358975A CN 104196573 A CN104196573 A CN 104196573A
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Abstract
The invention discloses a low-pressure last stage blade of a rotating speed-variable air cooling industrial steam turbine with a steam exhaust area of 3.6 m2. The low-pressure last stage blade is a section-variable twisted blade, and comprises a blade body, a blade root, and a shroud ring and a tiepiece boss for enabling the blade to form whole lap self locking; the relative height Ld of the blade body is monotonically increased from 0% to 100%; the ratio T/b of the pitch to the chord length from the blade root section to the blade top section is not lower than 0.4 and not higher than 1.0; the ratio T/B of the pitch to the axial width of the blade profile section from the blade root section to the blade top section is not higher than 3.5 and not lower than 0.4; and the ratio T/Dmax of the pitch to the maximal thickness of the blade profile section from the blade root section to the blade top section is not higher than 21.5 and not lower than 2.5. The blade has excellent variable working condition operation performance and strong vibration performance, is reasonable in structure, is conveniently assembled, can be safely operated under the back pressure of 0.05-0.25 bar and the rotating speed of 3000-4000 rpm, and has wide market application prospect.
Description
Technical field
The present invention relates to a kind of turbine blade, especially a kind of leaving area 3.6m2 variable speed air cooling industrial steam turbine low pressure stage group exhaust stage blade.
Background technique
The variable speed air cooling industrial steam turbine at home demand of power industry constantly increases, and its efficient design highlights its significance gradually.Air-cooled Unit is a kind of typical variable parameter operation unit, with respect to water chiller, the design back-pressure of Air-cooled Unit is high and economy scope is large, the variation of ambient temperature scope of atmosphere is large, exhaust stage blade must be met can be moved by blocking operating mode under air blast operating mode, no matter in low back pressure, block in operating mode or high back pressure, air blast situation, the operating conditions of exhaust stage blade is all very severe.So low pressure stage group exhaust stage blade has become the key link in design.Only have hold exactly whole unit particularly the through-flow performance of low pressure stage group just can design the variable speed air cooling industrial steam turbine exhaust stage blade of high efficient and reliable.
Summary of the invention
A kind of leaving area 3.6m2 variable speed air cooling industrial steam turbine low pressure stage group exhaust stage blade that the object of the invention is the deficiency in order to solve above-mentioned technology and design, this blade has good off design performance and strength character, rational in infrastructure, easy to assembly.
The leaving area 3.6m2 variable speed air cooling industrial steam turbine low pressure stage group exhaust stage blade that the present invention is designed, it is a kind of variable cross section twisted blade, comprise blade, blade root and for making blade form shroud and the lacing wire boss of whole circle self-locking, the high Ld of the relative leaf of described blade, by 0% monotone increasing to 100%, from the pitch to chord length of Dao Ye top section, blade root cross section than T/b Changing Pattern is: 0.4≤T/b≤1.0; From the pitch of Dao Ye top section, blade root cross section with blade profile cross section axial width than T/B Changing Pattern be: 0.4≤T/B≤3.5; From the pitch of Dao Ye top section, blade root cross section with blade profile cross section maximum ga(u)ge than T/Dmax Changing Pattern be: 2.5≤T/Dmax≤21.5; From the pitch of Dao Ye top section, blade root cross section with blade profile section area than T/A Changing Pattern be: 0.01≤T/A≤0.20; From the blade profile leading-edge radius R0 Changing Pattern of Dao Ye top section, blade root cross section be: 1.5mm≤R0≤1.8mm; From blade profile trailing edge radius R 1 Changing Pattern of Dao Ye top section, blade root cross section be: 1.2mm≤R1≤1.7mm.
As preferably:
Described blade height is 580mm.
Described blade root is fir-tree root, and blade root axial width is 220mm.
Described boss is elliptical table, boss centre distance blade bottom 360mm.
Described blade, its leading edge back of the body arc place is provided with the part of hardening.
The leaving area 3.6m2 variable speed air cooling industrial steam turbine low pressure stage group exhaust stage blade of gained of the present invention, blade adopts three-dimensional flow designing technique to design, width, thickness and the cross sectional area in cross section are reduced to top gradually by root, dullness seamlessly transits, there is certain distortion rule along the high direction blade of leaf, take into account the requirement of blade static strength, reasonable along the each thermal parameter regularity of distribution of blade, make blade there is good aeroperformance.Through professional computational fluid dynamics software CFX and Numeca checking, be that under the operating mode of 0.1bar, outlet Mach 2 ship 0.5, the pneumatic efficiency of place low pressure stage group is in 82% left and right in back pressure, peak rate of flow, more than 320t/h, has good off design performance simultaneously; Blade is the linear leaf that carries the whole circle self-locking damping of shroud type, blade middle and upper part has boss, there is shroud on leaf top, between each blade boss and all have the gap of 0.1-0.6mm between shroud, under working speed, due to the effect of centrifugal force, blade produces certain anti-twisted, make between boss and boss, shroud and shroud, to fit between blade, produce positive pressure and frictional force, increased the damping of system; Reach the whole circle self-locking structure of blade simultaneously, improve the vibration performance of blade, reduce the suffered dynamic stress of blade; Blade root adopts fir-tree root design, and blade is easy to assembly, can be at back pressure 0.05bar ~ 0.25bar, and safe operation under rotating speed 3000rpm ~ 4000rpm, has wide market application foreground.
Brief description of the drawings
Fig. 1 is blade front view of the present invention.
Fig. 2 is blade-side view of the present invention.
Fig. 3 is blade plan view of the present invention.
Fig. 4 is the long-pending folded schematic diagram of vane type line of the present invention.
The adjacent two blade shroud band plan views of Fig. 5.
Fig. 6 is the adjacent two blade boss sectional views of the present invention.
Fig. 7 is the adjacent three blade self-locking connection diagrams of the present invention.
In figure: shroud 1, lacing wire boss 2, blade 3, blade root 4.
Embodiment
Below by embodiment, the invention will be further described by reference to the accompanying drawings.
Embodiment 1.
As shown in Fig. 1-7, the described leaving area 3.6m2 variable speed of the present embodiment air cooling industrial steam turbine low pressure stage group exhaust stage blade, it is a kind of variable cross section twisted blade, comprise blade 3, blade root 4 and for making blade form shroud 1 and the lacing wire boss of whole circle self-locking, the high Ld of described blade 3 relative leaf, by 0% monotone increasing to 100%, from the pitch to chord length of Dao Ye top section, blade root cross section than T/b Changing Pattern is: 0.4≤T/b≤1.0; From the pitch of Dao Ye top section, blade root cross section with blade profile cross section axial width than T/B Changing Pattern be: 0.4≤T/B≤3.5; From the pitch of Dao Ye top section, blade root cross section with blade profile cross section maximum ga(u)ge than T/Dmax Changing Pattern be: 2.5≤T/Dmax≤21.5; From the pitch of Dao Ye top section, blade root cross section with blade profile section area than T/A Changing Pattern be: 0.01≤T/A≤0.20; From the blade profile leading-edge radius R0 Changing Pattern of Dao Ye top section, blade root cross section be: 1.5mm≤R0≤1.8mm; From blade profile trailing edge radius R 1 Changing Pattern of Dao Ye top section, blade root cross section be: 1.2mm≤R1≤1.7mm.Wherein, described blade 3 is highly 580mm; Described blade root 4 is fir-tree root, and blade root 4 axial widths are 220mm, and blade pass is crossed fir-tree root 4 and is arranged in impeller groove, axially assembling; Described boss is elliptical table, boss centre distance blade 3 bottom 360mm; Described blade 3, its leading edge back of the body arc place is provided with the part of hardening, and the length of hardening is determined as required.
When static, blade is monolithic structure, and boss and shroud 1 are not all fitted, and under working speed, due to the effect of centrifugal force, blade 3 produces certain anti-twisted, makes generation positive pressure and frictional force between boss and boss, shroud 1 and shroud 1, has increased the damping of system; Make the whole circle of blade (as Fig. 7) in groups simultaneously, improve the vibration performance of blade.
The leaving area 3.6m2 variable speed air cooling industrial steam turbine low pressure stage group exhaust stage blade of gained of the present invention, blade adopts three-dimensional flow designing technique to design, width, thickness and the cross sectional area in cross section are reduced to top gradually by root, dullness seamlessly transits, there is certain distortion rule along the high direction blade of leaf, take into account the requirement of blade static strength, reasonable along the each thermal parameter regularity of distribution of blade, make blade there is good aeroperformance.Through professional computational fluid dynamics software CFX and Numeca checking, be that under the operating mode of 0.1bar, outlet Mach 2 ship 0.5, the pneumatic efficiency of place low pressure stage group is in 82% left and right in back pressure, peak rate of flow, more than 320t/h, has good off design performance simultaneously; Blade is the linear leaf that carries the whole circle self-locking damping of shroud 1 type, blade 3 middle and upper parts have boss, there is shroud 1 on leaf top, between each blade boss and all have the gap of 0.1-0.6mm between shroud 1, under working speed, due to the effect of centrifugal force, blade 3 produces certain anti-twisted, make laminating between boss and boss, shroud 1 and shroud 1 between blade, produce positive pressure and frictional force, increased the damping of system; Reach the whole circle self-locking structure of blade simultaneously, improve the vibration performance of blade, reduce the suffered dynamic stress of blade; Blade root 4 adopts fir-tree root design, and blade is easy to assembly, can be at back pressure 0.05bar ~ 0.25bar, and safe operation under rotating speed 3000rpm ~ 4000rpm, has wide market application foreground.
Claims (5)
1. a leaving area 3.6m2 variable speed air cooling industrial steam turbine low pressure stage group exhaust stage blade, it is a kind of variable cross section twisted blade, comprise blade, blade root and for making blade form shroud and the lacing wire boss of whole circle self-locking, it is characterized in that the high Ld of the relative leaf of described blade, by 0% monotone increasing to 100%, from the pitch to chord length of Dao Ye top section, blade root cross section than T/b Changing Pattern is: 0.4≤T/b≤1.0; From the pitch of Dao Ye top section, blade root cross section with blade profile cross section axial width than T/B Changing Pattern be: 0.4≤T/B≤3.5; From the pitch of Dao Ye top section, blade root cross section with blade profile cross section maximum ga(u)ge than T/Dmax Changing Pattern be: 2.5≤T/Dmax≤21.5; From the pitch of Dao Ye top section, blade root cross section with blade profile section area than T/A Changing Pattern be: 0.01≤T/A≤0.20; From the blade profile leading-edge radius R0 Changing Pattern of Dao Ye top section, blade root cross section be: 1.5mm≤R0≤1.8mm; From blade profile trailing edge radius R 1 Changing Pattern of Dao Ye top section, blade root cross section be: 1.2mm≤R1≤1.7mm.
2. leaving area 3.6m2 variable speed air cooling industrial steam turbine low pressure stage group exhaust stage blade according to claim 1, is characterized in that described blade height is 580mm.
3. leaving area 3.6m2 variable speed air cooling industrial steam turbine low pressure stage group exhaust stage blade according to claim 2, is characterized in that described blade root is fir-tree root, and blade root axial width is 220mm.
4. according to the leaving area 3.6m2 variable speed air cooling industrial steam turbine low pressure stage group exhaust stage blade described in claim 2 or 3, it is characterized in that described boss is elliptical table, boss centre distance blade bottom 360mm.
5. leaving area 3.6m2 variable speed air cooling industrial steam turbine low pressure stage group exhaust stage blade according to claim 4, is characterized in that described blade, and its leading edge back of the body arc place is provided with the part of hardening.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410358975.1A CN104196573B (en) | 2014-07-28 | 2014-07-28 | Low-pressure last stage blade of rotating speed-variable air cooling industrial steam turbine with steam exhaust area of 3.6 m2 |
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| CN201410358975.1A CN104196573B (en) | 2014-07-28 | 2014-07-28 | Low-pressure last stage blade of rotating speed-variable air cooling industrial steam turbine with steam exhaust area of 3.6 m2 |
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| CN104196573A true CN104196573A (en) | 2014-12-10 |
| CN104196573B CN104196573B (en) | 2017-02-22 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106089314A (en) * | 2016-07-29 | 2016-11-09 | 杭州汽轮机股份有限公司 | Leaving area 3.2m2the efficiently low-pressure stage group final stage moving blade of industrial steam turbine |
| CN108119187A (en) * | 2018-02-11 | 2018-06-05 | 杭州汽轮机股份有限公司 | A kind of industrial steam turbine low-pressure stage movable vane piece of variable speed big flow |
| CN108194149A (en) * | 2018-02-11 | 2018-06-22 | 杭州汽轮机股份有限公司 | A kind of industrial steam turbine high efficiency drum grade movable vane piece |
| CN108204249A (en) * | 2016-12-20 | 2018-06-26 | 上海汽轮机厂有限公司 | Variable speed last-stage moving blade of air-cooled steam turbine |
| CN108374691A (en) * | 2018-02-11 | 2018-08-07 | 杭州汽轮机股份有限公司 | A kind of industrial steam turbine final stage moving blade of variable speed big flow |
| CN109611158A (en) * | 2018-11-02 | 2019-04-12 | 杭州汽轮机股份有限公司 | A kind of industrial steam turbine 3600rpm high load capacity low-pressure stage movable vane piece |
| CN109695479A (en) * | 2018-08-22 | 2019-04-30 | 杭州汽轮机股份有限公司 | A kind of high revolving speed high load capacity low-pressure stage movable vane piece of industrial steam turbine |
| CN109707461A (en) * | 2018-08-22 | 2019-05-03 | 杭州汽轮机股份有限公司 | A kind of high revolving speed high load capacity last stage movable vane of industrial steam turbine |
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| CN2479214Y (en) * | 2001-06-12 | 2002-02-27 | 东方汽轮机厂 | Final blade of large steam turbine |
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| CN103806946A (en) * | 2013-10-30 | 2014-05-21 | 杭州汽轮机股份有限公司 | Variable speed industrial steam turbine low-pressure stage group last stage blade with steam exhaust area of 2.1 m<2> |
| CN203948136U (en) * | 2014-07-28 | 2014-11-19 | 杭州汽轮机股份有限公司 | The low pressure stage group exhaust stage blade of leaving area 3.6m2 variable speed air cooling industrial steam turbine |
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| US5480285A (en) * | 1993-08-23 | 1996-01-02 | Westinghouse Electric Corporation | Steam turbine blade |
| CN2479214Y (en) * | 2001-06-12 | 2002-02-27 | 东方汽轮机厂 | Final blade of large steam turbine |
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| CN102434223A (en) * | 2011-12-13 | 2012-05-02 | 杭州汽轮机股份有限公司 | Low-pressure stage final blade of large-flow air-cooled steam turbine |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106089314B (en) * | 2016-07-29 | 2017-10-31 | 杭州汽轮机股份有限公司 | Leaving area 3.2m2The low-pressure stage group final stage moving blade of efficient industrial steam turbine |
| CN106089314A (en) * | 2016-07-29 | 2016-11-09 | 杭州汽轮机股份有限公司 | Leaving area 3.2m2the efficiently low-pressure stage group final stage moving blade of industrial steam turbine |
| CN108204249A (en) * | 2016-12-20 | 2018-06-26 | 上海汽轮机厂有限公司 | Variable speed last-stage moving blade of air-cooled steam turbine |
| CN108194149B (en) * | 2018-02-11 | 2023-10-13 | 杭州汽轮机股份有限公司 | High-efficient rotary drum level moving blade of industrial steam turbine |
| CN108194149A (en) * | 2018-02-11 | 2018-06-22 | 杭州汽轮机股份有限公司 | A kind of industrial steam turbine high efficiency drum grade movable vane piece |
| CN108374691A (en) * | 2018-02-11 | 2018-08-07 | 杭州汽轮机股份有限公司 | A kind of industrial steam turbine final stage moving blade of variable speed big flow |
| CN108119187A (en) * | 2018-02-11 | 2018-06-05 | 杭州汽轮机股份有限公司 | A kind of industrial steam turbine low-pressure stage movable vane piece of variable speed big flow |
| CN108119187B (en) * | 2018-02-11 | 2023-10-17 | 杭州汽轮机股份有限公司 | Low-pressure-stage moving blade of industrial steam turbine with variable rotation speed and large flow |
| CN108374691B (en) * | 2018-02-11 | 2024-03-29 | 杭州汽轮动力集团股份有限公司 | Variable-rotation-speed high-flow industrial turbine last-stage moving blade |
| CN109695479A (en) * | 2018-08-22 | 2019-04-30 | 杭州汽轮机股份有限公司 | A kind of high revolving speed high load capacity low-pressure stage movable vane piece of industrial steam turbine |
| CN109707461A (en) * | 2018-08-22 | 2019-05-03 | 杭州汽轮机股份有限公司 | A kind of high revolving speed high load capacity last stage movable vane of industrial steam turbine |
| CN109695479B (en) * | 2018-08-22 | 2023-12-29 | 杭州汽轮动力集团股份有限公司 | High-rotating-speed high-load low-pressure-stage moving blade for industrial steam turbine |
| CN109707461B (en) * | 2018-08-22 | 2024-02-23 | 杭州汽轮动力集团股份有限公司 | High-rotation-speed high-load final-stage movable blade for industrial steam turbine |
| CN109611158A (en) * | 2018-11-02 | 2019-04-12 | 杭州汽轮机股份有限公司 | A kind of industrial steam turbine 3600rpm high load capacity low-pressure stage movable vane piece |
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Address after: 310022 Building 1, No. 608, Kangxin Road, Linping District, Hangzhou, Zhejiang Patentee after: Hangzhou Turbine Power Group Co.,Ltd. Address before: No. 357, Shiqiao Road, Jianggan District, Hangzhou, Zhejiang 310022 Patentee before: HANGZHOU STEAM TURBINE Co.,Ltd. |
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