Blade assembly and turbine power plant

Abstract

The application relates to the technical field of axial flow blade rotation, in particular to a blade assembly and a turbine power generation device. The blade assembly comprises primary static blades and primary dynamic blades; the outlet structural angle of the primary static blades and the inlet structural angle of the primary dynamic blades are matched; the chord length of the tip section of the primary static blades, the chord length of the middle section of the primary static blades and the chord length of the root section of the primary static blades are sequentially decreased; the chord length of the middle section of the primary dynamic blades is smaller than the chord length of the tip section of the primary dynamic blades and the chord length of the root section of the primary dynamic blades. By configuring the blade type geometric parameters, the chord lengths of the sections of the blades are optimized, the number of the blades is effectively reduced, the turning angle is increased, the overall unit efficiency is improved, and the durability of the blade assembly is enhanced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of axial flow blade rotation, in particular to a blade assembly and a turbine power generation device. BACKGROUND

[0002] The top gas pressure recovery turbine (TRT) is a device that utilizes the heat energy and pressure energy of the byproduct gas of a blast furnace to generate power. The device mainly comprises a main shaft, an inner static blade shell, a casing, an air inlet and outlet guide basin, moving and static blades and assemblies, a regulating mechanism, and the like. The moving and static blades are the most core components of the entire unit, and the design quality thereof directly determines the efficiency of the unit and greatly affects the stability and service life of the unit.

[0003] The present application inventors have found in research that the existing moving and static blades are generally thin and have a low blade turning angle and a low single-stage expansion ratio, which cannot meet the current industry needs. SUMMARY

[0004] In view of the above problems, the present application provides a blade assembly and a turbine power generation device to solve the above problems in the prior art.

[0005] According to one aspect of the present application, a blade assembly comprises: a first-stage static blade and a first-stage moving blade, the first-stage static blade and the first-stage moving blade being oppositely arranged; a first-stage static blade outlet structure angle and a first-stage moving blade inlet structure angle being cooperatively arranged; an outlet structure angle of a tip section of the first-stage static blade, an outlet structure angle of a middle section of the first-stage static blade, and an outlet structure angle of a root section of the first-stage static blade being sequentially increased; an inlet structure angle of a tip section of the first-stage moving blade, an inlet structure angle of a middle section of the first-stage moving blade, and an inlet structure angle of a root section of the first-stage moving blade being sequentially decreased; a chord length of the tip section of the first-stage static blade, a chord length of the middle section of the first-stage static blade, and a chord length of the root section of the first-stage static blade being sequentially decreased; and a chord length of the middle section of the first-stage moving blade being smaller than the chord length of the tip section of the first-stage moving blade and the chord length of the root section of the first-stage moving blade.

[0006] According to the blade wheel mechanical design principle, by matching the geometric characteristics of the first-stage static blade and the first-stage moving blade, the chord lengths of the first-stage static blade and the first-stage moving blade are increased, the blade thickness is improved, the blade turning angle is increased, the single-machine expansion ratio is increased, the overall unit efficiency is improved, and the service life of the blade is also improved.

[0007] In an alternative mode, the outlet structure angle of the tip section of the first-stage vane blade is -75° to -65°, the outlet structure angle of the middle section of the first-stage vane blade is -74° to -64°, and the outlet structure angle of the root section of the first-stage vane blade is -73° to -63°; the inlet structure angle of the tip section of the first-stage rotor blade is 4° to 14°, the inlet structure angle of the middle section of the first-stage rotor blade is -29° to -19°, and the inlet structure angle of the root section of the first-stage rotor blade is -49° to -39°; the chord length of the tip section of the first-stage vane blade is 210 to 270 mm, the chord length of the middle section of the first-stage vane blade is 170 to 230 mm, and the chord length of the root section of the first-stage vane blade is 130 to 190 mm; the chord length of the tip section of the first-stage rotor blade is 205 to 265 mm, the chord length of the middle section of the first-stage rotor blade is 190 to 250 mm, and the chord length of the root section of the first-stage rotor blade is 210 to 270 mm.

[0008] In an alternative mode, the leading edge radius of the tip section of the first-stage vane blade, the leading edge radius of the middle section of the first-stage vane blade, and the leading edge radius of the root section of the first-stage vane blade are equal, being 4 to 8 mm, and in actual production, the leading edge radius of each section can have a deviation of ±2 mm; the trailing edge radius of the tip section of the first-stage vane blade, the trailing edge radius of the middle section of the first-stage vane blade, and the trailing edge radius of the root section of the first-stage vane blade are equal, being 1 to 3 mm, and in actual production, the leading edge radius of each section can have a deviation of ±2 mm; the inlet structure angle of the tip section of the first-stage vane blade, the inlet structure angle of the middle section of the first-stage vane blade, and the inlet structure angle of the root section of the first-stage vane blade are equal, being -11° to -1°, and in actual production, the inlet flow angle of each section can have a deviation of ±2.5°.

[0009] In an alternative mode, the installation angle of the tip section of the first-stage vane blade, the installation angle of the middle section of the first-stage vane blade, and the installation angle of the root section of the first-stage vane blade are sequentially increased; the installation angle of the tip section of the first-stage vane blade is 36° to 41°, the installation angle of the middle section of the first-stage vane blade is 38.5° to 43.5°, and the installation angle of the root section of the first-stage vane blade is 41° to 46°.

[0010] In an alternative mode, the leading edge radius of the tip section of the first stage blade, the leading edge radius of the middle section of the first stage blade and the leading edge radius of the root section of the first stage blade are sequentially increased; the leading edge radius of the tip section of the first stage blade is 1-5 mm, the leading edge radius of the middle section of the first stage blade is 2-6 mm, and the leading edge radius of the root section of the first stage blade is 5-12 mm; the trailing edge radius of the tip section of the first stage blade, the trailing edge radius of the middle section of the first stage blade and the trailing edge radius of the root section of the first stage blade are sequentially increased; the trailing edge radius of the tip section of the first stage blade is 0.5-3 mm, the trailing edge radius of the middle section of the first stage blade is 1-3.5 mm, and the trailing edge radius of the root section of the first stage blade is 1.5-4 mm; the installation angle of the tip section of the first stage blade, the installation angle of the middle section of the first stage blade and the installation angle of the root section of the first stage blade are sequentially increased; the installation angle of the tip section of the first stage blade is 22°-32°, the installation angle of the middle section of the first stage blade is 45°-55°, and the installation angle of the root section of the first stage blade is 73°-83°; the outlet structure angle of the tip section of the first stage blade, the outlet structure angle of the middle section of the first stage blade and the outlet structure angle of the root section of the first stage blade are sequentially decreased; the outlet structure angle of the tip section of the first stage blade is 71°-87°, the outlet structure angle of the middle section of the first stage blade is 61°-71°, and the outlet structure angle of the root section of the first stage blade is 59°-69°.

[0011] In an alternative mode, the vane assembly further comprises a secondary stationary vane and a secondary moving vane, the secondary stationary vane and the secondary moving vane are oppositely arranged; the outlet structure angle of the secondary stationary vane and the inlet structure angle of the secondary moving vane are cooperatively arranged; the outlet structure angle of the tip section of the secondary stationary vane, the outlet structure angle of the middle section of the secondary stationary vane and the outlet structure angle of the root section of the secondary stationary vane are sequentially increased; the outlet structure angle of the tip section of the secondary stationary vane is -70° to -80°, the outlet structure angle of the middle section of the secondary stationary vane is -63° to -73°, and the outlet structure angle of the root section of the secondary stationary vane is -60° to -70°; the inlet structure angle of the tip section of the secondary moving vane, the inlet structure angle of the middle section of the secondary moving vane and the inlet structure angle of the root section of the secondary moving vane are sequentially decreased; the inlet structure angle of the tip section of the secondary moving vane is 28° to 38°, the inlet structure angle of the middle section of the secondary moving vane is -24° to -14°, and the inlet structure angle of the root section of the secondary moving vane is -50° to -40°; the chord length of the tip section of the secondary stationary vane, the chord length of the middle section of the secondary stationary vane and the chord length of the root section of the secondary stationary vane are sequentially decreased; the chord length of the tip section of the secondary stationary vane is 175 to 235 mm, the chord length of the middle section of the secondary stationary vane is 130 to 190 mm, and the chord length of the root section of the secondary stationary vane is 90 to 150 mm; the chord length of the tip section of the secondary moving vane, the chord length of the middle section of the secondary moving vane and the chord length of the root section of the secondary moving vane are sequentially decreased; the chord length of the tip section of the secondary moving vane is 210 to 270 mm, the chord length of the middle section of the secondary moving vane is 205 to 265 mm, and the chord length of the root section of the secondary moving vane is 190 to 250 mm.

[0012] In an alternative mode, the leading edge radius of the tip section of the secondary stationary vane, the leading edge radius of the middle section of the secondary stationary vane and the leading edge radius of the root section of the secondary stationary vane are equal, and are 4 to 8 mm, and in actual production, the leading edge radius of each section may have a deviation of ±2 mm; the trailing edge radius of the tip section of the secondary stationary vane, the trailing edge radius of the middle section of the secondary stationary vane and the trailing edge radius of the root section of the secondary stationary vane are equal, and are 1 to 3 mm, and in actual production, the trailing edge radius of each section may have a deviation of ±2 mm; the outlet structure angle of the primary moving vane and the inlet structure angle of the secondary stationary vane are cooperatively arranged; the inlet structure angle of the tip section of the secondary stationary vane, the inlet structure angle of the middle section of the secondary stationary vane and the inlet structure angle of the root section of the secondary stationary vane are sequentially increased; the inlet structure angle of the tip section of the secondary stationary vane is -15° to -5°, the inlet structure angle of the middle section of the secondary stationary vane is 0° to 10°, and the inlet structure angle of the root section of the secondary stationary vane is 16° to 26°.

[0013] In an alternative way, the installation angle of the tip section of the secondary stationary vane, the installation angle of the middle section of the secondary stationary vane and the installation angle of the root section of the secondary stationary vane are sequentially increased; the installation angle of the tip section of the secondary stationary vane is 32°-42°, the installation angle of the middle section of the secondary stationary vane is 36°-46°, and the installation angle of the root section of the secondary stationary vane is 42°-52°.

[0014] In an alternative way, the leading edge radius of the tip section of the secondary moving vane, the leading edge radius of the middle section of the secondary moving vane and the leading edge radius of the root section of the secondary moving vane are sequentially increased; the leading edge radius of the tip section of the secondary moving vane is 1-5 mm, the leading edge radius of the middle section of the secondary moving vane is 2-7 mm, and the leading edge radius of the root section of the secondary moving vane is 6-15 mm; the trailing edge radius of the tip section of the secondary moving vane, the trailing edge radius of the middle section of the secondary moving vane and the trailing edge radius of the root section of the secondary moving vane are sequentially increased; the trailing edge radius of the tip section of the secondary moving vane is 0.5-3 mm, the trailing edge radius of the middle section of the secondary moving vane is 1.5-4 mm, and the trailing edge radius of the root section of the secondary moving vane is 2-6 mm; the installation angle of the tip section of the secondary moving vane, the installation angle of the middle section of the secondary moving vane and the installation angle of the root section of the secondary moving vane are sequentially increased; the installation angle of the tip section of the secondary moving vane is 15°-25°, the installation angle of the middle section of the secondary moving vane is 41°-51°, and the installation angle of the root section of the secondary moving vane is 60°-85°; the outlet structure angle of the tip section of the secondary moving vane, the outlet structure angle of the middle section of the secondary moving vane and the outlet structure angle of the root section of the secondary moving vane are sequentially decreased; the outlet structure angle of the tip section of the secondary moving vane is 70°-85°, the outlet structure angle of the middle section of the secondary moving vane is 62°-72°, and the outlet structure angle of the root section of the secondary moving vane is 53°-63°.

[0015] According to another aspect of the present application, a turbine power generation device is provided, comprising the blade assembly of any one of the above; the number of blades of the primary stationary vane on the turbine power generation device is 20-30; the number of blades of the primary moving vane on the turbine power generation device is 20-25.

[0016] The present application optimizes the design of the blade assembly, increases the chord length of each section of the blade, effectively reduces the number of blades, so that a larger blade thickness can be used in the design, and the wear resistance of the blade is improved. In addition, by increasing the chord length of each section of the blade, a larger turning angle can be used for the single-stage blade, the expansion ratio of the single-stage blade is improved, and the blade power is improved; at the same time, by increasing the chord length of each section of the blade, the load distribution of each stage of the blade along the meridian plane is more uniform, which is beneficial to improve the unit efficiency.

[0017] The above description is only a summary of the technical solutions of the present application, in order to more clearly understand the technical means of the present application, and can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0018] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become apparent to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered to be limiting on the present application. Moreover, the same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0019] Figure 1 A side view of the blade assembly provided by the embodiment of the present application is shown;

[0020] Figure 2 A top view of the blade assembly provided by the embodiment of the present application is shown;

[0021] Figure 3 A schematic view of the position relationship of the cross section of the primary stationary blade of the blade assembly provided by the embodiment of the present application is shown;

[0022] Figure 4 A schematic view of the structure of the blade tip cross section of the primary stationary blade of the blade assembly provided by the embodiment of the present application is shown;

[0023] Figure 5 A schematic view of the position relationship of the cross section of the primary moving blade of the blade assembly provided by the embodiment of the present application is shown;

[0024] Figure 6 A schematic view of the structure of the blade tip cross section of the primary moving blade of the blade assembly provided by the embodiment of the present application is shown;

[0025] Figure 7 A schematic view of the characteristic line of the blade assembly provided by the embodiment of the present application using fluid dynamics calculation is shown.

[0026] The reference numerals in the detailed description are as follows:

[0027] 100, primary vane; 110, primary vane tip section; 111, primary vane tip section leading edge; 112, primary vane tip section trailing edge; 120, primary vane mid-section; 130, primary vane root section; 140, primary vane stem;

[0028] 200, primary rotor blade; 210, primary rotor blade tip section; 211, primary rotor blade tip section leading edge; 212, primary rotor blade tip section trailing edge; 220, primary rotor blade mid-section; 230, primary rotor blade root section; 240, primary rotor blade tenon; 300, secondary vane; 400, secondary rotor blade; 500, blade assembly. DETAILED DESCRIPTION

[0029] The embodiments of the present application will be described in detail with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the present application, and therefore only serve as examples, but cannot be used to limit the protection scope of the present application.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification herein is for describing particular embodiments only and is not intended to be limiting of the application; the use of the terms "include," "have," or "comprise" and variations thereof herein is intended to be equivalent to the term "comprising" and is used to mean the inclusion of the stated feature, but not the exclusion of any additional features. The use of the terms "first," "second," and the like does not imply any importance or any relative position.

[0031] In the description of the embodiments of the present application, the technical terms "first", "second", and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the technical features indicated. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0032] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0033] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are A, A and B, and B. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0034] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0035] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0036] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0037] At present, the traditional turbine generator blade on the market adopts short chord length design to ensure the unit efficiency. Although this can reduce the boundary layer friction loss of the blade profile, due to the too short chord length of the blade, in order to ensure that the relative grid distance meets the requirements, the number of blades must be more, resulting in that the blade design is generally thin and the blade turning angle is low, the corrosion resistance is weak, and the single-stage expansion ratio is low, which cannot meet the current industry needs.

[0038] The blade assembly disclosed in the embodiments of the present application, the application scenarios include but are not limited to TRT power generation device (Top Gas Pressure Recovery Turbine, Top Gas Pressure Recovery Turbine), turbine generator, steam turbine, axial flow fan, compressor and other devices and equipment that need to set rotating blades to guide or flow gas.

[0039] According to an aspect of the embodiments of the present application, as Figure 1 and Figure 2As shown, a blade assembly 500 is provided for a steam turbine, comprising a first stage stator blade 100 and a first stage rotor blade 200; an outlet structure angle of the first stage stator blade 100 and an inlet structure angle of the first stage rotor blade 200 are cooperatively arranged; the outlet structure angle of a tip section of the first stage stator blade, the outlet structure angle of a mid-section of the first stage stator blade and the outlet structure angle of a root section of the first stage stator blade are sequentially increased; the inlet structure angle of the tip section of the first stage rotor blade, the inlet structure angle of the mid-section of the first stage rotor blade and the inlet structure angle of the root section of the first stage rotor blade are sequentially decreased; the chord length of the tip section of the first stage stator blade, the chord length of the mid-section of the first stage stator blade and the chord length of the root section of the first stage stator blade are sequentially decreased; the chord length of the mid-section of the first stage rotor blade is less than the chord length of the tip section of the first stage rotor blade and the chord length of the root section of the first stage rotor blade.

[0040] The blade assembly has a blade radial direction, and the blade radial direction sequentially has a tip section, a mid-section and a root section from high to low; key geometric parameters of each section mainly include a chord length, a maximum thickness, a leading edge radius, a trailing edge radius, an inlet structure angle, an outlet structure angle and a blade profile installation angle, and a three-dimensional structure of the blade body is obtained by radially stacking the three sections.

[0041] Table 1 below shows a plurality of design parameters of each section of the first stage stator blade 100.

[0042] Table 1

[0043]

[0044] Figure 3 A first stage stator blade tip section 110, a first stage stator blade mid-section 120 and a first stage stator blade root section 130 along a first stage stator blade radial direction from high to low are shown, Figure 4 A positional relationship diagram of the first stage stator blade tip section 110 is shown; reference is made to Figure 3 and Figure 4 The blade chord length L1 refers to the maximum distance between the leading edge and the trailing edge of the blade; the maximum thickness of the blade refers to the maximum diameter of a circle tangent to the pressure surface line l c and the suction surface line l d at the same time; the leading edge radius refers to the fillet radius connected between the pressure surface line l c and the suction surface line l d on the inlet side; the trailing edge radius refers to the fillet radius connected between the pressure surface line l c and the suction surface line l dThe fillet radius between the leading edge and the trailing edge of the tip section of the first-stage vane is 4-8 mm, the fillet radius between the leading edge and the trailing edge of the middle section of the first-stage vane is 4-8 mm, and the fillet radius between the leading edge and the trailing edge of the root section of the first-stage vane is 4-8 mm.

[0045] Reference is made to Figure 3 and Figure 4 In combination with Table 1, the chord length L1 of the tip section of the first-stage vane is 210-270 mm, the chord length of the middle section of the first-stage vane is 170-230 mm, and the chord length of the root section of the first-stage vane is 130-190 mm. The leading edge radius of the tip section of the first-stage vane, the leading edge radius of the middle section of the first-stage vane, and the leading edge radius of the root section of the first-stage vane are equal, and are between 4-8 mm, with an error of less than 2 mm between the leading edge radius of each section. The trailing edge radius of the tip section of the first-stage vane, the trailing edge radius of the middle section of the first-stage vane, and the trailing edge radius of the root section of the first-stage vane are equal, and are between 1-3 mm, with an error of less than 2 mm between the trailing edge radius of each section. The inlet structural angle a1 of the tip section of the first-stage vane, the inlet structural angle of the middle section of the first-stage vane, and the inlet structural angle of the root section of the first-stage vane are equal, and are between -11° and -1°, with an error of less than 2.5° between the inlet structural angle of each section.

[0046] The inlet structural angle of the tip section 110 of the first-stage vane, the middle section 120 of the first-stage vane, and the root section 130 of the first-stage vane are equal, the outlet structural angle is sequentially increased, and the chord length is sequentially decreased, and the tip section 110 of the first-stage vane, the middle section 120 of the first-stage vane, and the root section 130 of the first-stage vane can rotate around the handle axis to realize adjustment and stability of the blast furnace top pressure, and can realize full closure of the flow passage, adjustment of the state of the inlet airflow, and better entry into the first-stage moving vane 200 to do work.

[0047] As shown in Figure 4 The angle between the chord line L1 of the tip section of the first-stage vane and the Y axis is the installation angle θ1 of the tip section of the first-stage vane. The installation angle of the tip section of the first-stage vane is 36°-41°, the installation angle of the middle section of the first-stage vane is 38.5°-43.5°, and the installation angle of the root section of the first-stage vane is 41°-46°.

[0048] The outlet structure angle of the first-stage stator blade tip section 110, the first-stage stator blade middle section 120 and the first-stage stator blade root section 130 is matched with the inlet structure angle of the first-stage rotor blade tip section 210, the first-stage rotor blade middle section 220 and the first-stage rotor blade root section 230. The outlet structure angle β1 of the first-stage stator blade tip section is -75° to -65°, the outlet structure angle of the first-stage stator blade middle section is -74° to -64°, and the outlet structure angle of the first-stage stator blade root section is -73° to -63°. Please refer to Figure 6 The inlet structure angle α2 of the first-stage rotor blade tip section is 4° to 14°, the inlet structure angle of the first-stage rotor blade middle section is -29° to -19°, and the inlet structure angle of the first-stage rotor blade root section is -49° to -39°.

[0049] The outlet structure angle β1 of the first-stage stator blade tip section and the inlet structure angle α2 of the first-stage rotor blade tip section (please refer to Figure 6 ) are matched with each other to ensure that the airflow can flow axially through the first-stage stator blade 100 and the first-stage rotor blade 200 stably. The outlet structure angle of the first-stage stator blade middle section 120 and the inlet structure angle of the first-stage stator blade root section 130 are matched with the optimized parameters of the inlet structure angle of the first-stage rotor blade middle section 220 and the inlet structure angle of the first-stage rotor blade root section 230, respectively. According to the design principle of the turbomachinery, the geometric parameters of the blade structure are optimized to make the airflow flow uniformly through the first-stage stator blade 100 and the first-stage rotor blade 200, improve the stability of the turbogenerator and prolong the service life.

[0050] The number of the first-stage stator blades 100 is 20 to 30. The first-stage stator blade 100 further comprises a first-stage stator blade shank 140 for fixing the first-stage stator blade 100 on the inner stator shell of the turbogenerator (not shown in the figure) to make the first-stage stator blade 100 rotate around the shank axis to adjust the working state of the turbogenerator and the top pressure of the blast furnace.

[0051] In the optional embodiment of the present application, the specific parameters of the first-stage stator blade 100 are as follows:

[0052] The first-stage stator blade tip section 110 has a chord length L1 of 242 mm, a leading edge radius of 6 mm, a trailing edge radius of 2 mm, an inlet structure angle α1 of 5°, an outlet structure angle β1 of -70°, an installation angle θ1 of 39° and a maximum thickness of 36 mm.

[0053] The first-stage stator blade middle section 120 has a chord length of 200 mm, a leading edge radius of 6 mm, a trailing edge radius of 2 mm, an inlet structure angle of 5°, an outlet structure angle of -69°, an installation angle of 41° and a maximum thickness of 28.5 mm.

[0054] The first-stage vane root section 130 has a chord length of 160 mm, a leading edge radius of 6 mm, a trailing edge radius of 2 mm, an inlet structure angle of 5°, an outlet structure angle of -68°, and an installation angle of 43°, and the maximum thickness of the first-stage vane root section 130 is 31 mm.

[0055] The above gives the specific parameters and schemes of the first-stage vane 100 in the blade assembly 500 of the application, and the detailed optimization design of the first-stage moving vane 200 in the blade assembly 500 of the application is further described below:

[0056] In some embodiments of the application, Table 2 below shows a plurality of design parameters of each section of the first-stage moving vane 200:

[0057] Table 2

[0058]

[0059] Figure 5 The first-stage moving vane tip section 210, the first-stage moving vane middle section 220, and the first-stage moving vane root section 230 are shown from high to low along the radial direction of the first-stage moving vane; as shown in Figure 5 and Figure 6 As shown in the two end points of the first-stage moving vane 200, the maximum length in the direction of the connecting line is the chord length of the first-stage moving vane, the chord length of the first-stage moving vane middle section is less than the chord length L2 of the first-stage moving vane tip section, and the chord length of the first-stage moving vane root section is greater than the chord length of the first-stage moving vane middle section; as can be seen from Table 2, the chord length L2 of the first-stage moving vane tip section is 205-265 mm; the chord length of the first-stage moving vane middle section 220 is 190-250 mm; and the chord length of the first-stage moving vane root section 230 is 210-270 mm.

[0060] The leading edge radius of the first-stage moving vane tip section is 1-5 mm, the leading edge radius of the first-stage moving vane middle section is 2-6 mm, and the leading edge radius of the first-stage moving vane root section is 5-12 mm;

[0061] The trailing edge radius of the first-stage moving vane tip section, the trailing edge radius of the first-stage moving vane middle section, and the trailing edge radius of the first-stage moving vane root section increase in turn. The trailing edge radius of the first-stage moving vane tip section is 0.5-3 mm, the trailing edge radius of the first-stage moving vane middle section is 1-3.5 mm, and the trailing edge radius of the first-stage moving vane root section is 1.5-4 mm.

[0062] The installation angle θ2 of the tip section of the primary moving blade, the installation angle of the middle section of the primary moving blade and the installation angle of the root section of the primary moving blade are sequentially increased. The installation angle of the tip section of the primary moving blade is 22°-32°, the installation angle of the middle section of the primary moving blade is 45°-55°, and the installation angle of the root section of the primary moving blade is 73°-83°.

[0063] By systematically optimizing the installation angle θ2 of the tip section of the primary moving blade, the installation angle of the middle section of the primary moving blade and the installation angle of the root section of the primary moving blade with the inlet structure angle α2 of the tip surface of the primary moving blade, the inlet structure angle of the middle section of the primary moving blade, the inlet structure angle of the root section of the primary moving blade, the outlet structure angle β2 of the tip section of the primary moving blade, the outlet structure angle of the middle section of the primary moving blade, the outlet structure angle of the root section of the primary moving blade, the chord length L2 of the tip section of the primary moving blade, the chord length of the middle section of the primary moving blade and the chord length of the root section of the primary moving blade, the aerodynamic efficiency and the reliability of the blade are improved.

[0064] The outlet structure angle β2 of the tip section of the primary moving blade, the outlet structure angle of the middle section of the primary moving blade and the outlet structure angle of the root section of the primary moving blade are sequentially decreased. The outlet structure angle β2 of the tip section of the primary moving blade is 71°-87°, the outlet structure angle of the middle section of the primary moving blade is 61°-71°, and the outlet structure angle of the root section of the primary moving blade is 59°-69°.

[0065] In some embodiments, the number of the primary moving blades 200 is 20-25, and the primary moving blade 200 further comprises a primary moving blade tenon 240 for mounting the primary moving blade 200 on a main shaft in a turbine generator set so that the primary moving blade 200 can rotate with the main shaft.

[0066] In the embodiments of the present application, as shown in Figure 5 and Figure 6 The specific parameters of the primary moving blade 200 are as follows:

[0067] The tip section 210 of the primary moving blade has a chord length L2 of 235 mm, a leading edge radius of 2 mm, a trailing edge radius of 1.2 mm, an inlet structure angle α2 of 9°, an outlet structure angle β2 of 78°, an installation angle θ2 of 28°, and a maximum thickness of 27.5 mm.

[0068] The middle section 220 of the primary moving blade has a chord length of 220 mm, a leading edge radius of 3 mm, a trailing edge radius of 1.5 mm, an inlet structure angle of -25°, an outlet structure angle of 66°, an installation angle of 50°, and a maximum thickness of 32.5 mm.

[0069] The first-stage blade root section 230 has a chord length of 230 mm, a leading edge radius of 8 mm, a trailing edge radius of 2.5 mm, an inlet structure angle of -45°, an outlet structure angle of 64°, and an installation angle of 78°, and the maximum thickness of the first-stage blade root section 230 is 52.5 mm.

[0070] It should be noted that the first-stage stator blade stem 140 and the first-stage rotor blade tenon 240 mentioned in the present application can be any form capable of achieving the same functions and effects as the present application.

[0071] In an embodiment of the present application, the blade assembly further comprises second-stage stator blades 300 and second-stage rotor blades 400, the second-stage stator blades 300 and the second-stage rotor blades 400 are oppositely arranged, and the outlet structure angle of each section of the second-stage stator blades 300 and the inlet structure angle of each section of the second-stage rotor blades 400 are cooperatively arranged. Table 3 below shows a plurality of design parameters of each section of the second-stage stator blades 300:

[0072] Table 3

[0073]

[0074] The overall shape of the second-stage stator blades 300 is similar to that of the first-stage stator blades 100, and therefore the structural schematic diagram of the section of the second-stage stator blades 300 is not shown in the present application.

[0075] The chord length of the tip section of the second-stage stator blades, the chord length of the middle section of the second-stage stator blades, and the chord length of the root section of the second-stage stator blades decrease in turn; the chord length of the tip section of the second-stage stator blades is 175-235 mm, the chord length of the middle section of the second-stage stator blades is 130-190 mm, and the chord length of the root section of the second-stage stator blades is 90-150 mm.

[0076] The leading edge radius of the tip section of the second-stage stator blades, the leading edge radius of the middle section of the second-stage stator blades, and the leading edge radius of the root section of the second-stage stator blades are equal, and are 4-8 mm, and the error between the leading edge radii of the sections is less than 2 mm;

[0077] The trailing edge radius of the tip section of the second-stage stator blades, the trailing edge radius of the middle section of the second-stage stator blades, and the trailing edge radius of the root section of the second-stage stator blades are equal, and are 1-3 mm, and the error between the trailing edge radii of the sections is less than 2 mm;

[0078] The inlet structure angle of the tip section of the second stationary vane, the inlet structure angle of the middle section of the second stationary vane and the inlet structure angle of the root section of the second stationary vane are designed to match the outlet structure angle of the tip section of the first moving vane, the outlet structure angle of the middle section of the first moving vane and the outlet structure angle of the root section of the first moving vane; the inlet structure angle of the tip section of the second stationary vane is -15° to -5°, the inlet structure angle of the middle section of the second stationary vane is 0° to 10°, and the inlet structure angle of the root section of the second stationary vane is 16° to 26°.

[0079] The installation angle of the tip section of the second stationary vane, the installation angle of the middle section of the second stationary vane and the installation angle of the root section of the second stationary vane are sequentially increased; the installation angle of the tip section of the second stationary vane is 32° to 42°, the installation angle of the middle section of the second stationary vane is 36° to 46°, and the installation angle of the root section of the second stationary vane is 42° to 52°.

[0080] The outlet structure angle of the tip section of the second stationary vane, the outlet structure angle of the middle section of the second stationary vane and the outlet structure angle of the root section of the second stationary vane are designed to match the inlet structure angle of the tip section of the second moving vane, the inlet structure angle of the middle section of the second moving vane and the inlet structure angle of the root section of the second moving vane, so as to ensure that the airflow stably flows through the second stationary vane and the second moving vane; the inlet structure angle of the tip section of the second stationary vane, the inlet structure angle of the middle section of the second stationary vane and the inlet structure angle of the root section of the second stationary vane are sequentially increased; the outlet structure angle of the tip section of the second stationary vane is -80° to -70°, the outlet structure angle of the middle section of the second stationary vane is -73° to -63°, and the outlet structure angle of the root section of the second stationary vane is -70° to -60°.

[0081] The inlet structure angle of the tip section of the second moving vane, the inlet structure angle of the middle section of the second moving vane and the inlet structure angle of the root section of the second moving vane are sequentially decreased; the inlet structure angle of the tip section of the second moving vane is 28° to 38°, the inlet structure angle of the middle section of the second moving vane is -24° to -14°, and the inlet structure angle of the root section of the second moving vane is -50° to -40°.

[0082] The number of the second stationary vanes 300 is 20 to 30; the second stationary vane 300 further comprises a second stationary vane stem for fixing the second stationary vane 300 on a stationary vane inner shell in the turbine generator (not shown in the figure), so that the second stationary vane 300 can rotate around the stem axis to adjust the working state of the turbine generator.

[0083] In the embodiment of the present application, the specific parameters of the second stationary vane 300 are as follows:

[0084] The chord length of the tip section of the second stationary blade is 205 mm, the leading edge radius is 6 mm, the trailing edge radius is 2 mm, the inlet structure angle is -10°, the outlet structure angle is -75°, and the installation angle is 37°. The maximum thickness of the tip section of the second stationary blade is 34 mm.

[0085] The chord length of the middle section of the second stationary blade is 160 mm, the leading edge radius is 6 mm, the trailing edge radius is 2 mm, the inlet structure angle is 5°, the outlet structure angle is -68°, and the installation angle is 50°. The maximum thickness of the middle section of the second stationary blade is 20 mm.

[0086] The chord length of the root section of the second stationary blade is 120 mm, the leading edge radius is 6 mm, the trailing edge radius is 2 mm, the inlet structure angle is 21°, the outlet structure angle is -65°, and the installation angle is 54°. The maximum thickness of the root section of the second stationary blade is 18-22 mm, and the number of second stationary blades 300 is 30-40.

[0087] The above gives the specific parameters and schemes of the design of the second stationary blade 300 in the blade assembly proposed in the embodiments of the application. The detailed design of the second moving blade 400 in the blade assembly of the application is further described below. Table 4 is a plurality of design parameters of each section of the second moving blade 400:

[0088] Table 4

[0089]

[0090] The overall shape of the second moving blade 400 is similar to that of the first moving blade 200, and therefore the sectional structural schematic diagram of the second moving blade 400 is not shown in the drawings. In some embodiments, the chord length of the tip section of the second moving blade is 210-270 mm, the chord length of the middle section of the second moving blade is 205-265 mm, and the chord length of the root section of the second moving blade is 190-250 mm.

[0091] The leading edge radius of the tip section of the second moving blade, the leading edge radius of the middle section of the second moving blade, and the leading edge radius of the root section of the second moving blade increase in turn. The leading edge radius of the tip section of the second moving blade is 1-5 mm, the leading edge radius of the middle section of the second moving blade is 2-7 mm, and the leading edge radius of the root section of the second moving blade is 6-15 mm.

[0092] The trailing edge radius of the tip section of the second moving blade, the trailing edge radius of the middle section of the second moving blade, and the trailing edge radius of the root section of the second moving blade increase in turn. The trailing edge radius of the tip section of the second moving blade is 0.5-3 mm, the trailing edge radius of the middle section of the second moving blade is 1.5-4 mm, and the trailing edge radius of the root section of the second moving blade is 2-6 mm.

[0093] The installation angle of the tip section of the secondary moving blade, the installation angle of the middle section of the secondary moving blade and the installation angle of the root section of the secondary moving blade are sequentially increased; the installation angle of the tip section of the secondary moving blade is 15°-25°, the installation angle of the middle section of the secondary moving blade is 41°-51°, and the installation angle of the root section of the secondary moving blade is 60°-85°.

[0094] The outlet structure angle of the tip section of the secondary moving blade, the outlet structure angle of the middle section of the secondary moving blade and the outlet structure angle of the root section of the secondary moving blade are sequentially decreased; the outlet structure angle of the tip section of the secondary moving blade is 70°-85°, the outlet structure angle of the middle section of the secondary moving blade is 62°-72°, and the outlet structure angle of the root section of the secondary moving blade is 53°-63°.

[0095] In the optional embodiment of the present application, the specific parameter settings of the secondary moving blade 400 are as follows:

[0096] The chord length of the tip section of the secondary moving blade is 240mm, the leading edge radius is 3.5mm, the trailing edge radius is 1mm, the inlet structure angle is 33°, the outlet structure angle is 80°, the installation angle is 20°, and the maximum thickness of the tip section of the secondary moving blade 400 is 15mm.

[0097] The chord length of the middle section of the secondary moving blade is 235mm, the leading edge radius is 6mm, the trailing edge radius is 2.5mm, the inlet structure angle is -19°, the outlet structure angle is -67°, the installation angle is 45°, and the maximum thickness of the middle section of the secondary moving blade is 30mm.

[0098] The chord length of the root section of the secondary moving blade is 220mm, the leading edge radius is 10mm, the trailing edge radius is 4mm, the inlet structure angle is -45°, the outlet structure angle is -58°, the installation angle is 78°, and the maximum thickness of the root section of the secondary moving blade is 60mm.

[0099] The number of the secondary moving blades 400 is 20-25, and the secondary moving blade 400 further comprises a secondary moving blade tenon for fixing the secondary moving blade 400 on the rotor main shaft in the turbine power generation device and rotating together with the rotor shaft. When the airflow flows through the secondary moving blade, the secondary moving blade converts part of the energy contained in the airflow into mechanical energy.

[0100] Wherein, since the structure of the primary moving blade 200 and the secondary moving blade 400 is the same, please refer to Figure 5, the fir-tree tenon is adopted, the first-stage moving blade 200 and the second-stage moving blade 400 are installed through the cooperation of the fir-tree tenon and the mortise on the main shaft, the mortise matched with the fir-tree tenon is formed by broaching, and in this case, the number of the first-stage moving blade and the second-stage moving blade needs to be consistent. Of course, if other tenon structures are adopted for the first-stage moving blade and the second-stage moving blade, the number of the first-stage moving blade and the second-stage moving blade can also be inconsistent.

[0101] The chord length of each section of the first-stage stationary blade 100, the first-stage moving blade 200, the second-stage stationary blade 300 and the second-stage moving blade 400 in the blade assembly 500 is designed to be increased, so that the chord length of each section of each blade is increased, and the number of blades can be effectively reduced. On the other hand, due to the increase of the chord length of each section of the first-stage stationary blade 100, the first-stage moving blade 200, the second-stage stationary blade 300 and the second-stage moving blade 400, and the cooperation of other geometric parameter designs, each blade can be set to a greater thickness, the corrosion resistance and wear resistance of each blade are improved, the load distribution of each blade along the meridian plane is more uniform, and the overall unit efficiency of the turbine generator device is improved. Thirdly, due to the increase of the chord length and thickness of each section of the first-stage stationary blade 100, the first-stage moving blade 200, the second-stage stationary blade 300 and the second-stage moving blade 400 in the blade assembly, each blade can adopt a larger turning angle, the expansion ratio of each blade is improved, and the work capacity of each blade is improved.

[0102] According to another aspect of the embodiment of the present application, a turbine generator device is provided, which comprises the blade assembly 500 in any of the above embodiments.

[0103] The preferred volume of the blast furnace top gas pressure recovery turbine generator device is 1580m 3 ~2200m 3 , through the hub with a diameter of 900mm, the flow passage height is 200mm~240mm, the load coefficient of the two-stage turbine stage is 1.2~1.5, the degree of reaction is 0.3~0.55, the isentropic efficiency of the turbine can reach 88%~89%, as shown in Figure 7 , the characteristic line verified by CFD (Computational Fluid Dynamics, Computational Fluid Dynamics) simulation; it can be known from Figure 7 that according to the CFD calculation result, the turbine generator device overall unit efficiency aerodynamic efficiency can reach 88%~89% at the design point A in the TRT turbine generator device using the blade assembly 500 provided by the present application.

[0104] It should be noted that the primary vanes and the secondary vanes can rotate around their corresponding vane stem center lines, and a new design obtained by rotating the primary vanes and the secondary vanes to obtain new geometric parameters of the primary vanes and the secondary vanes is also within the scope of the claims of the present application. In addition, a new design obtained by scaling down or up the design parameters of the vane assembly according to the embodiments of the present application is also within the scope of the claims of the present application.

[0105] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A vane assembly, characterized by, The blade assembly comprises: a primary stationary blade and a primary moving blade, the primary stationary blade and the primary moving blade being oppositely arranged; an outlet structure angle of the primary stationary blade and an inlet structure angle of the primary moving blade are cooperatively arranged; the outlet structure angle of the tip section of the primary stationary blade, the outlet structure angle of the middle section of the primary stationary blade and the outlet structure angle of the root section of the primary stationary blade are sequentially increased; the inlet structure angle of the tip section of the primary moving blade, the inlet structure angle of the middle section of the primary moving blade and the inlet structure angle of the root section of the primary moving blade are sequentially decreased; the chord length of the tip section of the primary stationary blade, the chord length of the middle section of the primary stationary blade and the chord length of the root section of the primary stationary blade are sequentially decreased; the chord length of the middle section of the primary moving blade is smaller than the chord length of the tip section of the primary moving blade and the chord length of the root section of the primary moving blade; the outlet structure angle of the tip section of the primary stationary blade is -75° to -65°, the outlet structure angle of the middle section of the primary stationary blade is -74° to -64°, and the outlet structure angle of the root section of the primary stationary blade is -73° to -63°; the inlet structure angle of the tip section of the primary moving blade is 4° to 14°, the inlet structure angle of the middle section of the primary moving blade is -29° to -19°, and the inlet structure angle of the root section of the primary moving blade is -49° to -39°; the chord length of the tip section of the primary stationary blade is 210 to 270 mm, the chord length of the middle section of the primary stationary blade is 170 to 230 mm, and the chord length of the root section of the primary stationary blade is 130 to 190 mm; the chord length of the tip section of the primary moving blade is 205 to 265 mm, the chord length of the middle section of the primary moving blade is 190 to 250 mm, and the chord length of the root section of the primary moving blade is 210 to 270 mm; the leading edge radius of the tip section of the primary stationary blade, the leading edge radius of the middle section of the primary stationary blade and the leading edge radius of the root section of the primary stationary blade are equal, and are 4 to 8 mm; the trailing edge radius of the tip section of the primary stationary blade, the trailing edge radius of the middle section of the primary stationary blade and the trailing edge radius of the root section of the primary stationary blade are equal, and are 1 to 3 mm; the inlet structure angle of the tip section of the primary stationary blade, the inlet structure angle of the middle section of the primary stationary blade and the inlet structure angle of the root section of the primary stationary blade are equal, and are -11° to -1°.

2. The vane assembly of claim 1, wherein, the installation angle of the tip section of the primary stationary blade, the installation angle of the middle section of the primary stationary blade and the installation angle of the root section of the primary stationary blade are sequentially increased; the installation angle of the tip section of the primary stationary blade is 36° to 41°, the installation angle of the middle section of the primary stationary blade is 38.5° to 43.5°, and the installation angle of the root section of the primary stationary blade is 41° to 46°.

3. The vane assembly of claim 1, wherein, the leading edge radius of the tip section of the primary moving blade, the leading edge radius of the middle section of the primary moving blade and the leading edge radius of the root section of the primary moving blade are sequentially increased; The leading edge radius of the tip section of the first-stage moving blade is 1-5 mm, the leading edge radius of the middle section of the first-stage moving blade is 2-6 mm, and the leading edge radius of the root section of the first-stage moving blade is 5-12 mm; The trailing edge radius of the tip section of the first-stage moving blade, the trailing edge radius of the middle section of the first-stage moving blade, and the trailing edge radius of the root section of the first-stage moving blade are sequentially increased; The trailing edge radius of the tip section of the first-stage moving blade is 0.5-3 mm, the trailing edge radius of the middle section of the first-stage moving blade is 1-3.5 mm, and the trailing edge radius of the root section of the first-stage moving blade is 1.5-4 mm; The installation angle of the tip section of the first-stage moving blade, the installation angle of the middle section of the first-stage moving blade, and the installation angle of the root section of the first-stage moving blade are sequentially increased; The installation angle of the tip section of the first-stage moving blade is 22-32°, the installation angle of the middle section of the first-stage moving blade is 45-55°, and the installation angle of the root section of the first-stage moving blade is 73-83°; The outlet structure angle of the tip section of the first-stage moving blade, the outlet structure angle of the middle section of the first-stage moving blade, and the outlet structure angle of the root section of the first-stage moving blade are sequentially decreased; The outlet structure angle of the tip section of the first-stage moving blade is 71-87°, the outlet structure angle of the middle section of the first-stage moving blade is 61-71°, and the outlet structure angle of the root section of the first-stage moving blade is 59-69°.

4. The vane assembly of claim 1, wherein, The blade assembly further comprises a second-stage static blade and a second-stage moving blade, and the second-stage static blade and the second-stage moving blade are oppositely arranged; The outlet structure angle of the second-stage static blade and the inlet structure angle of the second-stage moving blade are cooperatively arranged; The outlet structure angle of the tip section of the second-stage static blade, the outlet structure angle of the middle section of the second-stage static blade, and the outlet structure angle of the root section of the second-stage static blade are sequentially increased; The outlet structure angle of the tip section of the second-stage static blade is -70° to -80°, the outlet structure angle of the middle section of the second-stage static blade is -63° to -73°, and the outlet structure angle of the root section of the second-stage static blade is -60° to -70°; The inlet structure angle of the tip section of the second-stage moving blade, the inlet structure angle of the middle section of the second-stage moving blade, and the inlet structure angle of the root section of the second-stage moving blade are sequentially decreased; The inlet structure angle of the tip section of the second-stage moving blade is 28-38°, the inlet structure angle of the middle section of the second-stage moving blade is -24° to -14°, and the inlet structure angle of the root section of the second-stage moving blade is -50° to -40°; The chord length of the tip section of the second-stage static blade, the chord length of the middle section of the second-stage static blade, and the chord length of the root section of the second-stage static blade are sequentially decreased; The chord length of the tip section of the second-stage static blade is 175-235 mm, the chord length of the middle section of the second-stage static blade is 130-190 mm, and the chord length of the root section of the second-stage static blade is 90-150 mm; The chord length of the tip section of the second-stage moving blade, the chord length of the middle section of the second-stage moving blade, and the chord length of the root section of the second-stage moving blade are sequentially decreased; The chord length of the tip section of the secondary moving blade is 210-270 mm, the chord length of the middle section of the secondary moving blade is 205-265 mm, and the chord length of the root section of the secondary moving blade is 190-250 mm.

5. The vane assembly of claim 4, wherein, The leading edge radius of the tip section of the secondary stationary blade, the leading edge radius of the middle section of the secondary stationary blade, and the leading edge radius of the root section of the secondary stationary blade are equal and are 4-8 mm; The trailing edge radius of the tip section of the secondary stationary blade, the trailing edge radius of the middle section of the secondary stationary blade, and the trailing edge radius of the root section of the secondary stationary blade are equal and are 1-3 mm; The inlet structure angle of the tip section of the secondary stationary blade, the inlet structure angle of the middle section of the secondary stationary blade, and the inlet structure angle of the root section of the secondary stationary blade are sequentially increased; The inlet structure angle of the tip section of the secondary stationary blade is -15° to -5°, the inlet structure angle of the middle section of the secondary stationary blade is 0° to 10°, and the inlet structure angle of the root section of the secondary stationary blade is 16° to 26°.

6. The vane assembly of claim 5, wherein, The installation angle of the tip section of the secondary stationary blade, the installation angle of the middle section of the secondary stationary blade, and the installation angle of the root section of the secondary stationary blade are sequentially increased; The installation angle of the tip section of the secondary stationary blade is 32° to 42°, the installation angle of the middle section of the secondary stationary blade is 36° to 46°, and the installation angle of the root section of the secondary stationary blade is 42° to 52°.

7. The vane assembly of claim 4, wherein, The leading edge radius of the tip section of the secondary moving blade, the leading edge radius of the middle section of the secondary moving blade, and the leading edge radius of the root section of the secondary moving blade are sequentially increased; The leading edge radius of the tip section of the secondary moving blade is 1-5 mm, the leading edge radius of the middle section of the secondary moving blade is 2-7 mm, and the leading edge radius of the root section of the secondary moving blade is 6-15 mm. The trailing edge radius of the tip section of the secondary moving blade, the trailing edge radius of the middle section of the secondary moving blade, and the trailing edge radius of the root section of the secondary moving blade are sequentially increased. The leading edge radius of the tip section of the secondary moving blade is 0.5-3 mm, the leading edge radius of the middle section of the secondary moving blade is 1.5-4 mm, and the leading edge radius of the root section of the secondary moving blade is 2-6 mm. The installation angle of the tip section of the secondary moving blade, the installation angle of the middle section of the secondary moving blade, and the installation angle of the root section of the secondary moving blade are sequentially increased. The installation angle of the tip section of the secondary moving blade is 15° to 25°, the installation angle of the middle section of the secondary moving blade is 41° to 51°, and the installation angle of the root section of the secondary moving blade is 60° to 85°. The outlet structure angle of the tip section of the secondary moving blade, the outlet structure angle of the middle section of the secondary moving blade, and the outlet structure angle of the root section of the secondary moving blade are sequentially decreased. The outlet structure angle of the secondary moving blade tip section is 70°-85°, the outlet structure angle of the secondary moving blade middle section is 62°-72°, and the outlet structure angle of the secondary moving blade root section is 53°-63°.

8. A turbogenerator comprising: The turbine power generation device comprises the blade assembly according to any one of claims 1-7. The number of the primary stationary blades on the turbine power generation device is 20-30. The number of the primary moving blades on the turbine power generation device is 20-25.

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