CN108194150B - Large-load efficient regulating-stage stationary blade of industrial steam turbine - Google Patents
Large-load efficient regulating-stage stationary blade of industrial steam turbine Download PDFInfo
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- CN108194150B CN108194150B CN201810140998.3A CN201810140998A CN108194150B CN 108194150 B CN108194150 B CN 108194150B CN 201810140998 A CN201810140998 A CN 201810140998A CN 108194150 B CN108194150 B CN 108194150B
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- 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
- F01D9/00—Stators
- F01D9/02—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
- F01D9/04—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector
- F01D9/041—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector using blades
Abstract
The invention discloses a large-load efficient regulation-stage stationary blade of an industrial steam turbine, which adopts an integral form and comprises a blade body, an upper mounting edge and a lower mounting edge. One end of the blade body is provided with an upper mounting edge integrally formed with the blade body, and the other end of the blade body is provided with a lower mounting edge integrally formed with the blade body, and the upper mounting edge and the lower mounting edge slide into corresponding positioning grooves during assembly. The blade body part is a uniform-section blade profile, the blade profile of the blade body consists of 5 sections of curves, namely a ab section, a bc section, a cd section, a de section and an ea section, the tangential slope at the joint of the 5 sections of curves is equal, the efficient blade has better efficiency than that of a conventional blade, the variable working condition characteristic is good, and the processing cost is only 1/4-1/3 of that of the conventional blade of the general discrete point blade profile.
Description
Technical Field
The invention belongs to the field of impeller machinery, and relates to a high-load efficient regulation-stage stationary blade of an industrial steam turbine.
Background
The industrial steam turbine is an important device for function conversion, and is widely applied to various fields of petroleum, chemical industry, metallurgy, energy, nuclear power, ships and the like. The industrial steam turbine has complex structure and high design and manufacturing difficulty, and belongs to the high-end equipment manufacturing industry.
For the industrial steam turbine, as the industrial steam turbine is mainly used as a driving machine of energy-consuming equipment such as a fan, a compressor, a pump and the like, the load characteristic of the driven machine determines the variable working condition characteristic of the industrial steam turbine, and the working condition change range is particularly wide. Therefore, the most important and obvious characteristic of the industrial turbine blade is that the blade needs to have very good variable working condition performance, and the blade has higher efficiency under different working conditions. Taking ABB company as an example, the efficiency of the blade is gradually improved by 5-generation upgrade and evolution from the blade with the code number of 200 in 1900 to the blade with the code number of 8000 in 1980; taking the GE company as an example, the blade of the super-blade has undergone 5 evolutions from the traditional blade in 1940, and reaches the super-blade (super profile) in 1980. With the development of computer technology and computational fluid dynamics, the full three-dimensional flow field optimization design of the turbine through-flow blade has become possible. The existing turbine blade molded lines are conventional molded lines developed in the early years, and the pneumatic performance of the existing turbine blade molded lines has a large improvement space.
As the core component of the steam turbine, the blades have the advantages of large quantity, complex shape and high processing requirement, and the processing workload is very large and accounts for 1/4 to 1/3 of the total processing volume of the steam turbine. The manufacturability of the blade determines the cost of the turbine to a great extent. The blade profile of the turbine newly developed by most manufacturers is discrete points and needs to be processed by adopting a numerical control processing method, so that the processing cost of the blade is increased.
In order to improve the heat economy of an industrial turbine and achieve the purposes of energy conservation and emission reduction, and reduce the processing cost of the blade, the invention has a great need for an industrial turbine blade with excellent performance and good processing manufacturability.
Disclosure of Invention
Aiming at the current situation that the efficiency of the existing industrial turbine regulating-stage stator blade has a large lifting space, the invention aims to provide the efficient industrial turbine regulating-stage stator blade which has higher aerodynamic performance, variable working condition performance and intensity vibration performance than the existing industrial turbine regulating-stage stator blade and has good processing manufacturability.
In order to achieve the purpose, the invention provides a high-load efficient regulation-stage stator blade of an industrial steam turbine, which adopts an integral form and comprises a blade body, an upper mounting edge and a lower mounting edge. The blade bodyOne end is provided with an upper mounting edge integrally formed with the blade body, and the other end of the blade body is provided with a lower mounting edge integrally formed with the blade body, and the upper mounting edge and the lower mounting edge slide into corresponding positioning grooves during assembly. The blade body part is a uniform-section blade profile, the blade profile of the blade body consists of 5 sections of curves, the curves are respectively ab section, bc section, cd section, de section and ea section, the ab section and bc section form a pressure surface, the ab section is a single circular arc, and the radius variation range is 0.75-R 1 The ratio of the long axis to the short axis is not less than 0.9 and not more than 2.5, the variation range of the long axis is not less than 0.3 and not more than 0.5, the section bc is a high-order spline curve, the section ab/ac is not less than 70%, the section cd is an ellipse as a blade front edge, the ratio range of the long axis to the short axis is not less than 0.9 and not more than aq/bq and not more than 2.5, the variation range of the long axis is not less than 0.3 and not more than 0.5, the section de is a high-order spline curve as a suction surface, the section ea is a single arc as a tail edge, and the radius range of the section ea is not more than 0.01 and not more than R 2 The slope of the tangent line at the joint of the curves of the section/b is less than or equal to 0.013,5.
The further scheme is that the blade body meets the following rules: the value of the chord ratio t/b is 0.617-0.784, the maximum thickness C of the blade profile max The value of/b is 0.228.ltoreq.C max B is less than or equal to 0.289, and the inlet wedge angle w 1 The value of (2) is 83.38 DEG-w 1 105.94 DEG and an outlet wedge angle w 2 The value of (2.76 DEG is less than or equal to w) 2 The value of the bending angle delta of the tail edge is more than or equal to 3.51 degrees and less than or equal to 14.61 degrees and less than or equal to 18.56 degrees. The value of the blade profile installation angle beta is more than or equal to 45 degrees and less than or equal to 70 degrees, and the value of the blade diamond angle gamma is more than or equal to 10 degrees and less than or equal to 40 degrees.
In a further scheme, the value of the blade body height H/b is more than or equal to 0.2 and less than or equal to 1.0, and the value of the blade body axial width S/b is more than or equal to 0.57 and less than or equal to 0.73. Transition fillet R of blade body and upper mounting edge 3 The value of b is 0.04.ltoreq.R 3 B is less than or equal to 0.051, and a transition fillet R of the blade body and the lower mounting edge 4 The value of b is 0.04.ltoreq.R 4 /b≤0.051。
Further, the width b of the upper mounting edge 1 The value of b is 0.84.ltoreq.b 1 B is less than or equal to 1.1, and the distance b between the upper mounting edge boss and the front edge 2 The value of b is 0.32.ltoreq.b 2 B is less than or equal to 0.42, and the width b of the boss of the upper mounting edge 3 The value of b is 0.2.ltoreq.b 3 B is less than or equal to 0.27, and the tail edge side height h of the upper mounting edge 1 The value of/b is 0.23.ltoreq.h 1 B is less than or equal to 0.29, and the front edge side height h of the upper mounting edge 2 The value of/b is 0.28.ltoreq.h 2 B is less than or equal to 0.36, and the tail edge side height h of the upper installation edge boss 3 The value of/b is 0.12.ltoreq.h 3 B is less than or equal to 0.16, and the front edge side height h of the upper installation edge boss 4 The value of/b is 0.09.ltoreq.h 4 B is less than or equal to 0.12, and the front edge side of the upper mounting edge is provided with a round angle R 5 The value of b is 0.05.ltoreq.R 5 B is less than or equal to 0.09, and the front edge side lower fillet R of the upper mounting edge 6 The value of b is 0.13.ltoreq.R 6 B is less than or equal to 0.17, and the width b of the lower mounting edge 4 The value of b is 0.84.ltoreq.b 4 B is less than or equal to 1.1, and the height h of the lower mounting edge 5 The value of/b is 0.21.ltoreq.h 5 B is less than or equal to 0.27, and the boss height h of the lower mounting edge 6 The value of/b is 0.13.ltoreq.h 6 B is less than or equal to 0.18, and the distance b between the lower mounting edge boss and the tail edge 5 The value of b is 0.63.ltoreq.b 5 /b≤0.81。
The invention has the following beneficial effects:
the high-load efficient regulation-level stationary blade for the industrial steam turbine is obtained by optimizing pneumatic performance of a blade body by adopting a full three-dimensional CFD method in combination with an artificial neural network method and a genetic algorithm. The high-efficiency blade profile of the invention is better than the conventional blade profile, and has good variable working condition characteristics. In the wide range of the inlet angle of 70-110 degrees, mach number of 0.1-1.4 and aspect ratio of 0.2-1.0, the aerodynamic performance is better, the variable working condition performance is better, the intensity vibration performance is equivalent to that of a conventional blade, the efficiency gain is over 0.85 percent under different working conditions, and the gain level is different along with the change of the working conditions. The blade profile pressure surface curve of the blade is in a single circular arc range of more than 70%, so that the pressure surface of the blade can be formed at one time by adopting a special milling cutter, the processing speed of the blade is greatly improved, and the processing cost of the blade is reduced. It is estimated that the processing cost of the high-efficiency adjusting-stage stator blade is only 1/4-1/3 of that of a common discrete point blade type conventional blade. The invention relates to a high-load efficient regulating-stage stationary blade of an industrial steam turbine, which is characterized in that a blade body, an upper mounting edge and a lower mounting edge are of an integrated structure, the upper mounting edge and the lower mounting edge slide into a positioning groove of a cylinder or an inner cylinder, and then are assembled and squeezed along the circumferential tangential direction. The high-efficiency adjusting stage blade has higher efficiency and variable working condition performance, excellent blade processing manufacturability and assembly performance, and wide market application prospect and competitiveness.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic view of a blade profile configuration of the present invention;
FIG. 3 is a schematic view of the blade dimensions of the present invention;
FIG. 4 is a schematic view of the structural dimensions of a blade according to the present invention;
fig. 5 is a schematic view of a blade mounting state.
Detailed Description
The invention is further described below by way of examples with reference to the accompanying drawings.
The embodiment is a regulating stage stationary blade of an industrial steam turbine, and the specific parameters are as follows: the back pressure was 59.15bar, the flow rate was 106.9kg/s, the rim efficiency was 90%, the total inlet pressure was 83.3bar, and the total inlet temperature was 803.93K.
As shown in FIG. 1, the high-load efficient regulation-stage stator blade of the industrial steam turbine comprises a blade body 2, wherein one end of the blade body 2 is provided with an upper mounting edge 1 integrally formed with the blade body 2, the other end of the blade body 2 is provided with a lower mounting edge 3 integrally formed with the blade body 2, the upper mounting edge 1 and the lower mounting edge 3 slide into corresponding positioning grooves during assembly, and the blade body 2 is partially of a uniform-section blade shape.
As shown in FIG. 2, the blade profile of the blade body 2 is composed of 5 sections of curves, which are respectively ab section, bc section, cd section, de section and ea section, the ab section and bc section form a pressure surface, the ab section is a single circular arc, and the radius variation range is 0.75-R 1 The ratio of the long axis to the short axis is not less than 0.9 and not more than 2.5, the variation range of the long axis is not less than 0.3 and not more than 0.5, the section bc is a high-order spline curve, the section ab/ac is not less than 70%, the section cd is an ellipse as a blade front edge, the ratio range of the long axis to the short axis is not less than 0.9 and not more than aq/bq and not more than 2.5, the variation range of the long axis is not less than 0.3 and not more than 0.5, the section de is a high-order spline curve as a suction surface, the section ea is a single arc as a tail edge, and the radius range of the section ea is not more than 0.01 and not more than R 2 The slope of the tangent line at the joint of the curves of the section/b is less than or equal to 0.013,5.
As shown in FIG. 3, the value of the chord ratio t/b is 0.617.ltoreq.t/b.ltoreq.0.784, and the maximum thickness C of the blade profile max The value of/b is 0.228.ltoreq.C max B is less than or equal to 0.289, inlet wedge anglew 1 The value of (2) is 83.38 DEG-w 1 105.94 DEG and an outlet wedge angle w 2 The value of (2.76 DEG is less than or equal to w) 2 The value of the bending angle delta of the tail edge is more than or equal to 3.51 degrees and less than or equal to 14.61 degrees and less than or equal to 18.56 degrees. The value of the blade profile installation angle beta is more than or equal to 45 degrees and less than or equal to 70 degrees, and the value of the blade diamond angle gamma is more than or equal to 10 degrees and less than or equal to 40 degrees.
As shown in FIG. 4, the blade height H/b is 0.2.ltoreq.H/b.ltoreq.1.0, and the blade axial width S/b is 0.57.ltoreq.S/b.ltoreq.0.73. Transition fillet R of blade body and upper mounting edge 3 The value of b is 0.04.ltoreq.R 3 B is less than or equal to 0.051, and a transition fillet R of the blade body and the lower mounting edge 4 The value of b is 0.04.ltoreq.R 4 And b is less than or equal to 0.051. Width b of upper mounting edge 1 The value of b is 0.84.ltoreq.b 1 B is less than or equal to 1.1, and the distance b between the upper mounting edge boss and the front edge 2 The value of b is 0.32.ltoreq.b 2 B is less than or equal to 0.42, and the width b of the boss of the upper mounting edge 3 The value of b is 0.2.ltoreq.b 3 B is less than or equal to 0.27, and the tail edge side height h of the upper mounting edge 1 The value of/b is 0.23.ltoreq.h 1 B is less than or equal to 0.29, and the front edge side height h of the upper mounting edge 2 The value of/b is 0.28.ltoreq.h 2 B is less than or equal to 0.36, and the tail edge side height h of the upper installation edge boss 3 The value of/b is 0.12.ltoreq.h 3 B is less than or equal to 0.16, and the front edge side height h of the upper installation edge boss 4 The value of/b is 0.09.ltoreq.h 4 B is less than or equal to 0.12, and the front edge side of the upper mounting edge is provided with a round angle R 5 The value of b is 0.05.ltoreq.R 5 B is less than or equal to 0.09, and the front edge side lower fillet R of the upper mounting edge 6 The value of b is 0.13.ltoreq.R 6 B is less than or equal to 0.17, and the width b of the lower mounting edge 4 The value of b is 0.84.ltoreq.b 4 B is less than or equal to 1.1, and the height h of the lower mounting edge 5 The value of/b is 0.21.ltoreq.h 5 B is less than or equal to 0.27, and the boss height h of the lower mounting edge 6 The value of/b is 0.13.ltoreq.h 6 B is less than or equal to 0.18, and the distance b between the lower mounting edge boss and the tail edge 5 The value of b is 0.63.ltoreq.b 5 /b≤0.81。
As shown in fig. 5, the upper mounting edge and the lower mounting edge are assembled and squeezed circumferentially and tangentially during mounting, and the working surfaces of the upper mounting edge and the lower mounting edge are attached to the cylinder 4 during working.
After the high-efficiency adjusting stage stationary blade is used by the industrial turbine, the adjusting stage efficiency is improved by about 4%, and the processing cost of the blade is reduced by 70% compared with that of a discrete blade type blade of a conventional high-efficiency blade.
Claims (3)
1. The utility model provides an industrial turbine high-load high-efficient regulation level stator blade, includes blade body (2), its characterized in that: one end of the blade body (2) is provided with an upper mounting edge (1) integrally formed with the blade body (2), the other end of the blade body (2) is provided with a lower mounting edge (3) integrally formed with the blade body (2), the upper mounting edge (1) and the lower mounting edge (3) slide into corresponding positioning grooves during assembly, the blade body (2) is partially of a uniform-section blade profile, the blade profile of the blade body (2) consists of 5 sections of curves, which are respectively ab section, bc section, cd section, de section and ea section, the ab section and bc section form a pressure surface, the ab section is a single circular arc, and the radius variation range of the ab section is not more than 0.75R 1 The ratio of the long axis to the short axis is not less than 0.9 and not more than 2.5, the variation range of the long axis is not less than 0.3 and not more than 0.5, the section bc is a high-order spline curve, the section ab/ac is not less than 70%, the section cd is an ellipse as a blade front edge, the ratio range of the long axis to the short axis is not less than 0.9 and not more than aq/bq and not more than 2.5, the variation range of the long axis is not less than 0.3 and not more than 0.5, the section de is a high-order spline curve as a suction surface, the section ea is a single arc as a tail edge, and the radius range of the section ea is not more than 0.01 and not more than R 2 The slope of the tangent line at the joint of the curves of the section (b) is equal to or less than 0.013,5;
the blade body (2) meets the following rules: the value of the chord ratio t/b is 0.617-0.784, the maximum thickness C of the blade profile max The value of/b is 0.228.ltoreq.C max B is less than or equal to 0.289, and the inlet wedge angle w 1 The value of (2) is 83.38 DEG-w 1 105.94 DEG and an outlet wedge angle w 2 The value of (2.76 DEG is less than or equal to w) 2 The value of the bending angle delta of the tail edge is more than or equal to 3.51 degrees, the value of delta is more than or equal to 14.61 degrees and less than or equal to 18.56 degrees, the value of the blade profile installation angle beta is more than or equal to 45 degrees and less than or equal to 70 degrees, and the value of the blade diamond angle gamma is more than or equal to 10 degrees and less than or equal to 40 degrees;
the value of the height H/b of the blade body (2) is more than or equal to 0.2 and less than or equal to 1.0, and the value of the axial width S/b of the blade body (2) is more than or equal to 0.57 and less than or equal to 0.73.
2. The high-load efficient regulating-stage stator blade of an industrial steam turbine according to claim 1, characterized in that the transition fillet R of the blade body (2) and the upper mounting edge (1) 3 The value of b is 0.04.ltoreq.R 3 B is less than or equal to 0.051, and a transition fillet R of the blade body (2) and the lower mounting edge (3) 4 The value of b is 0.04.ltoreq.R 4 /b≤0.051。
3. The high-load efficient regulating-stage stator blade of an industrial steam turbine according to claim 1, characterized in that the upper mounting edge (1) width b 1 The value of b is 0.84.ltoreq.b 1 B is less than or equal to 1.1, and the distance b between the boss of the upper mounting edge (1) and the front edge 2 The value of b is 0.32.ltoreq.b 2 B is less than or equal to 0.42, and the boss width b of the upper mounting edge (1) 3 The value of b is 0.2.ltoreq.b 3 B is less than or equal to 0.27, and the tail edge side height h of the upper mounting edge (1) 1 The value of/b is 0.23.ltoreq.h 1 B is less than or equal to 0.29, the front edge side height h of the upper mounting edge (1) 2 The value of/b is 0.28.ltoreq.h 2 B is less than or equal to 0.36, and the height h of the tail edge side of the boss of the upper mounting edge (1) 3 The value of/b is 0.12.ltoreq.h 3 B is less than or equal to 0.16, and the height h of the front edge side of the boss of the upper mounting edge (1) 4 The value of/b is 0.09.ltoreq.h 4 B is less than or equal to 0.12, and the front edge side of the upper mounting edge (1) is provided with a round angle R 5 The value of b is 0.05.ltoreq.R 5 B is less than or equal to 0.09, and the front edge side lower fillet R of the upper mounting edge (1) 6 The value of b is 0.13.ltoreq.R 6 B is less than or equal to 0.17, the width b of the lower mounting edge (3) 4 The value of b is 0.84.ltoreq.b 4 B is less than or equal to 1.1, the height h of the lower mounting edge (3) 5 The value of/b is 0.21.ltoreq.h 5 B is less than or equal to 0.27, and the boss height h of the lower mounting edge (3) 6 The value of/b is 0.13.ltoreq.h 6 B is less than or equal to 0.18, and the distance b between the boss of the lower mounting edge (3) and the tail edge 5 The value of b is 0.63.ltoreq.b 5 /b≤0.81。
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| CN201460990U (en) * | 2009-03-30 | 2010-05-12 | 哈尔滨三维汽轮机叶片有限公司 | Moving blade of steam turbine |
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| CN107152312A (en) * | 2017-06-19 | 2017-09-12 | 上海理工大学 | A kind of design method of multistage subsonic speed centrifugal turbine impeller |
| CN207847706U (en) * | 2018-02-11 | 2018-09-11 | 杭州汽轮机股份有限公司 | A kind of efficient governing stage stator blade of industrial steam turbine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5603800B2 (en) * | 2011-02-22 | 2014-10-08 | 株式会社日立製作所 | Turbine stationary blade and steam turbine equipment using the same |
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|---|---|---|---|---|
| US4695228A (en) * | 1980-07-31 | 1987-09-22 | Kraftwerk Union Aktiengesellschaft | Turbo-machine blade |
| CN201460990U (en) * | 2009-03-30 | 2010-05-12 | 哈尔滨三维汽轮机叶片有限公司 | Moving blade of steam turbine |
| CN102587997A (en) * | 2011-01-13 | 2012-07-18 | 阿尔斯通技术有限公司 | Vane for an axial flow turbomachine and corresponding turbomachine |
| CN206129330U (en) * | 2016-09-18 | 2017-04-26 | 北京全四维动力科技有限公司 | Quiet cascade of steam turbine and adopt its steam turbine |
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Address after: 311100 Building 1, No. 608, Kangxin Road, Linping District, Hangzhou, Zhejiang Applicant after: Hangzhou Turbine Power Group Co.,Ltd. Address before: 357 Shiqiao Road, Xiacheng District, Hangzhou City, Zhejiang Province Applicant before: HANGZHOU STEAM TURBINE Co.,Ltd. |
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| GR01 | Patent grant | ||
| GR01 | Patent grant |