395mm penultimate-stage moving blade for 100MW steam turbine

Abstract

The utility model discloses a 395mm penultimate-stage moving blade for a 100MW steam turbine, relates to a penultimate-stage moving blade, and aims to solve the problem that an existing penultimate-stage moving blade cannot adapt to unit cylinder cutting operation. The penultimate-stage moving blade provided by the utility model comprises a blade working part, a blade root, a shroud ring and a semicircular tie bar, the shroud ring, the blade working part and the blade root are forged into a whole from top to bottom, the semicircular lacing wire is installed in the middle of the blade working part, the molded line of the blade working part is a variable cross-section twisted blade, namely, two adjacent cross sections are twisted relatively, the cross-section area of the blade working part is gradually reduced from the root to the top, the height L of the blade working part is 395 mm, and the height L of the blade working part is 5 mm. The axial width V of the root of the blade working part is 80.06 mm, the diameter phi of the root of the blade working part is 1384 mm, and the steam exhaust area of the blade working part is 2.21 m < 2 >. The moving blade is used as a penultimate-stage moving blade on a 100MW-grade steam turbine set.

Description

TECHNICAL FIELD

[0001] The utility model relates to a next-to-last stage moving blade, in particular to a 395mm next-to-last stage moving blade for 100MW steam turbine. BACKGROUND

[0002] With the advent of the new situation of the electricity market, the flexibility reconstruction of thermal power units is increasingly favored by the market. First, China is the largest country in renewable energy consumption, and with the proposal of the "double carbon" target, the proportion of renewable energy such as wind and solar power will further increase, and the flexibility reconstruction of thermal power units is an important means of new energy consumption, which not only plays a bottom-up guarantee role, but also continuously improves the level of clean and efficient development; second, with the change of China's energy consumption structure, the peak-valley difference of electricity consumption is further widened, and unit peak shaving operation is imperative; third, for the "three north" regions with heat and power contradictions, the flexibility reconstruction of thermal power can effectively alleviate the heat and power contradictions.

[0003] The next-to-last stage long blade has a large stress, a very poor operating condition, and is easily affected by back pressure and load changes, and under the unit flexibility operating condition, problems such as water erosion and increased dynamic stress are easily caused, which endangers the safety of the equipment. As one of the main equipment of power plants, the flexibility of thermal power steam turbines is crucial, and among them, the long blade is the most critical. Therefore, it is very practical to develop a 395mm next-to-last stage moving blade suitable for flexible operation under the cylinder cutting condition. SUMMARY

[0004] The present application solves the problem that the existing next-to-last stage blade cannot adapt to the cylinder cutting operation of the unit, and further provides a 395mm next-to-last stage moving blade for a 100MW full-speed steam turbine.

[0005] A 395mm next-to-last stage moving blade for a 100MW steam turbine, the next-to-last stage moving blade comprising a blade working part, a blade root, a shroud and a semicircular reinforcing bar, the shroud, the blade working part and the blade root are integrally die forged from top to bottom, the semicircular reinforcing bar is installed in the middle of the blade working part, the profile of the blade working part is a variable cross-section twisted blade, that is, there is a relative twist between adjacent two cross sections, the cross-sectional area of the blade working part gradually decreases from the root to the top, the height L of the blade working part is 395mm, the root axial width V of the blade working part is 80.06mm, the root diameter of the blade working part is 1384mm, and the exhaust area of the blade working part is 2.21m 2 ;

[0006] Further, the root axial width V of the blade working part to the top axial width V1 of the blade working part changes in the range of 80.06mm-38.21mm, the chord length b changes in the range of 80.60mm-79.08mm, and the installation angle βy the range of the maximum thickness T of the profile is 20.39mm-7.36mm, the range of the inlet angle a is 30.30°-122.450°, and the range of the outlet angle θ is 25.78°-19.86°;

[0007] Further, the axial width V of the blade working portion at the height L of 0mm, 20mm, 62mm, 112mm, 158mm, 202mm, 267mm, 315mm, 357mm and 395mm is 80.06mm, 78.09mm, 74.56mm, 69.07mm, 64.21mm, 59.76mm, 53.43mm, 47.41mm, 42.25mm and 38.21mm respectively, the chord length b is 80.60mm, 79.10mm, 76.98mm, 73.88mm, 72.18mm, 71.53mm, 72.86mm, 74.85mm, 77.75mm and 79.08mm respectively, and the installation angle β is 83.41°, 80.90°, 75.86°, 69.53°, 63.69°, 57.69°, 47.64°, 39.41°, 32.75° and 28.89° respectively. y Further, the range of the maximum thickness T of the profile is 20.39mm-7.36mm, the range of the inlet angle a is 30.30°-122.450°, and the range of the outlet angle θ is 25.78°-19.86°;

[0008] Further, the blade root is a forked blade root.

[0009] Further, the total height K of the blade root is 88mm.

[0010] Further, the axial width W of the blade root is 97.5mm.

[0011] Further, the thickness H of the shroud is 5.4mm.

[0012] Further, the axial distance B1 of the shroud working surface is 40.37mm.

[0013] The beneficial effects of this application compared to the prior art are:

[0014] 1. The 395mm secondary and final stage moving blade provided in this application for a 100MW full-speed steam turbine is based on one-dimensional / quasi-three-dimensional / full three-dimensional aerodynamic and strength analysis calculations. It adopts a full three-dimensional design, with the moving blade twisted along the blade height to form a long blade stage. The blade tip adopts a self-contained shroud to reduce losses, reduce air leakage, improve unit efficiency, and meet the requirements for safe and efficient operation under cylinder cutting conditions. It is easy to assemble and safe and reliable in operation. This application is applied to 100MW-class steam turbine units.

[0015] 2. The 395mm secondary and final stage moving blade provided in this application for a 100MW full-speed steam turbine adopts comprehensive optimization of hydrodynamics and structural strength, solves the problem of integrated aerodynamic / structural design optimization, and makes the flow efficiency and strength vibration characteristics of the 395mm blade optimal.

[0016] 3. The 395mm secondary and final stage moving blade provided in this application for a 100MW full-speed steam turbine can have 102 moving blades per revolution on the final stage impeller of the steam turbine in practical applications. It has reached an advanced level in terms of economy, strength and vibration characteristics, static strength and ensuring the safety and reliability of the unit.

[0017] 4. This application provides a 395mm secondary and final stage moving blade for a 100MW full-speed steam turbine, which adopts a semi-split tie rod, airfoil shroud connection, and forked blade root to ensure blade connection strength. The blade material is 05Cr17Ni4Cu4Nb steel. The design of the shroud and tie rod is more refined to ensure the safe and efficient operation of the unit. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the second-to-last stage moving blade described in this application;

[0019] Figure 2 This is a top view of the circumferential zone of the secondary and final stage moving blades described in this application;

[0020] Figure 3 This is a schematic diagram of the cross-sectional fracture superposition of the working part of the blade in the second-to-last stage moving blade described in this application;

[0021] Figure 4 This is a front view of the assembly of the semi-circular tie rod 4 in the secondary and final stage moving blades described in this application.

[0022] Figure 5 This is a typical cross-sectional schematic diagram of the working part 1 of the blade in the second-to-last stage moving blade described in this application;

[0023] Figure 6 yes Figure 5a local enlarged view of the middle Ⅱ;

[0024] Figure 7 is Figure 5 a local enlarged view of the middle Ⅰ;

[0025] In the figure, 1 is a working part of a blade, 2 is a blade root, 3 is a shroud, 4 is a semicircular tension bar, L is a height of the working part of the blade, V is an axial width of a root of the working part of the blade, V1 is an axial width of a top of the working part of the blade, b is a chord length, β y is an installation angle, T is a maximum thickness of a profile, α is an inlet angle, θ is an outlet angle, K is a total height of the blade root, W is an axial width of the blade root, H is a thickness of the shroud, and B1 is an axial distance of a working surface of the shroud. DETAILED DESCRIPTION

[0026] Specific implementation one: in combination Figures 1 to 7 In the embodiment, a 395mm penultimate moving blade for a 100MW steam turbine is provided, the penultimate moving blade comprising a working part of a blade 1, a blade root 2, a shroud 3 and a semicircular tension bar 4, the shroud 3, the working part of the blade 1 and the blade root 2 being integrally die forged from top to bottom, the semicircular tension bar 4 being installed in the middle of the working part of the blade 1, a profile of the working part of the blade 1 being a variable cross-section twisted blade, that is, there is a relative twist between two adjacent cross sections, a cross-sectional area of the working part of the blade 1 gradually decreasing from the root to the top, the height L of the working part of the blade 1 being 395mm, the axial width V of the root of the working part of the blade 1 being 80.06mm, a diameter of the root of the working part of the blade 1 being 1384mm, a steam exhausting area of the working part of the blade 1 being 2.21m 2 .

[0027] The 395mm penultimate moving blade for the 100MW steam turbine provided in the embodiment is used when assembling a whole circle of blades, the blade is only installed and requires that two blade roots are tightly attached to each other; the blade tip is provided with a self-crown damping shroud; the whole blade is tightly assembled, and when running, the blade is restored by twisting, the shrouds of adjacent blades are in contact, and the moving blades are connected to form a whole circle.

[0028] Specific implementation two: in combination Figures 1 to 7 In the embodiment, the difference between the embodiment and the specific implementation one is that the axial width V of the root of the working part of the blade 1 to the axial width V1 of the top of the working part of the blade 1 is in the range of 80.06mm-38.21mm, the chord length b is in the range of 80.60mm-79.08mm, the installation angle β yThe variation range is 83.41° to 29.55°, the variation range of the maximum profile thickness T is 20.39 mm to 7.36 mm, the variation range of the inlet angle α is 30.30° to 122.450°, and the variation range of the outlet angle θ is 25.78° to 19.86°. Other components and connection methods are the same as in Specific Implementation Method 1.

[0029] Specific implementation method three: Combining Figures 1 to 7 This embodiment differs from Specific Embodiment Two in that the axial width V of the working part 1 at heights L of 0mm, 20mm, 62mm, 112mm, 158mm, 202mm, 267mm, 315mm, 357mm, and 395mm are respectively 80.06mm, 78.09mm, 74.56mm, 69.07mm, 64.21mm, 59.76mm, 53.43mm, 47.41mm, 42.25mm, and 38.21mm. The corresponding chord lengths b are respectively 80.60mm, 79.10mm, 76.98mm, 73.88mm, 72.18mm, 71.53mm, 72.86mm, 74.85mm, 77.75mm, and 79.08mm. The corresponding mounting angles β... y The angles are, in order: 83.41°, 80.90°, 75.86°, 69.53°, 63.69°, 57.69°, 47.64°, 39.41°, 32.75°, and 28.89°, respectively. The corresponding maximum profile thicknesses T are, in order: 20.39mm, 20.15mm, 19.63mm, 19.24mm, 18.67mm, 16.88mm, 13.42mm, 10.85mm, 8.40mm, and 7.23mm. The corresponding inlet angles α are 30.30°, 30.22°, 35.72°, 37.56°, 43.64°, 49.08°, 60.83°, 82.81°, 99.27°, and 122.45°, respectively, and the corresponding outlet angles θ are 25.78°, 25.25°, 25.57°, 22.80°, 21.60°, 21.13°, 20.51°, 20.35°, 20.26°, and 19.86°, respectively. Other components and connection methods are the same as in Specific Implementation Method Two.

[0030] Combined with the description of specific implementation method two and specific implementation method three, by adopting the above structural parameters, while ensuring that the external structural dimensions of the blade meet the design requirements, the blade can also be easily assembled. The table below shows the specific parameters of each section in the working part 1 of the blade.

[0031]

[0032] Specific implementation four: combination Figures 1 to 7 The difference between this embodiment and the specific implementation three is that the blade root 2 is a forked blade root. The other components and connection modes are the same as those of the specific implementation three.

[0033] Specific implementation five: combination Figures 1 to 7 The difference between this embodiment and the specific implementation four is that the total height K of the blade root 2 is 88 mm. The other components and connection modes are the same as those of the specific implementation four.

[0034] Specific implementation six: combination Figures 1 to 7 The difference between this embodiment and the specific implementation five is that the axial width W of the blade root 2 is 97.5 mm. The other components and connection modes are the same as those of the specific implementation five.

[0035] Specific implementation seven: combination Figures 1 to 7 The difference between this embodiment and the specific implementation six is that the thickness H of the shroud 3 is 5.4 mm. The other components and connection modes are the same as those of the specific implementation six.

[0036] Specific implementation eight: combination Figures 1 to 7 The difference between this embodiment and the specific implementation seven is that the axial distance B1 of the working surface of the shroud 3 is 40.37 mm. The other components and connection modes are the same as those of the specific implementation seven.

[0037] It is illustrated in the specific implementation four to the specific implementation eight that the forked blade root of the blade root 2 can make the blade firmly installed in the rim, and the assembly is stable, safe and reliable.

[0038] The above has been disclosed in the preferred embodiments of the utility model, but is not used to limit the utility model. Any skilled person in the art can make some changes or modifications to the above disclosed structure and technical content without departing from the technical solution of the utility model, and equivalent embodiments of equivalent changes can be obtained. However, any simple modification, equivalent change and modification of the above embodiments made according to the technical essence of the utility model without departing from the technical solution of the utility model still belong to the technical solution of the utility model.

Claims

1. A 395 mm last stage blade for use on a 100 MW steam turbine, characterized by: The last-stage blade comprises a blade working part (1), a blade root (2), a shroud (3) and a semi-circular tension bar (4), the shroud (3), the blade working part (1) and the blade root (2) are integrally die forged from top to bottom, the semi-circular tension bar (4) is installed in the middle of the blade working part (1), the profile line of the blade working part (1) is a variable cross-section twisted blade, that is, the adjacent two cross sections are relatively twisted, the cross-sectional area of the blade working part (1) gradually decreases from the root to the top, the height (L) of the blade working part (1) is 395mm, the root axial width (V) of the blade working part (1) is 80.06mm, the root diameter of the blade working part (1) is 1384mm, the exhaust area of the blade working part (1) is 2.21m 2 ; The root axial width (V) of the blade working part (1) to the top axial width (V1) of the blade working part (1) ranges from 80.06mm to 38.21mm, the chord length (b) ranges from 80.60mm to 79.08mm, the installation angle (β y ) ranges from 83.41° to 29.55°, the maximum thickness of the profile (T) ranges from 20.39mm to 7.36mm, the inlet angle (α) ranges from 30.30° to 122.450°, and the outlet angle (θ) ranges from 25.78° to 19.86°. The height (L) of the blade working part (1) at 0 mm, 20 mm, 62 mm, 112 mm, 158 mm, 202 mm, 267 mm, 315 mm, 357 mm, 395 mm is respectively 80.06 mm, 78.09 mm, 74.56 mm, 69.07 mm, 64.21 mm, 59.76 mm, 53.43 mm, 47.41 mm, 42.25 mm, 38.21 mm, the corresponding chord length (b) is respectively 80.60 mm, 79.10 mm, 76.98 mm, 73.88 mm, 72.18 mm, 71.53 mm, 72.86 mm, 74.85 mm, 77.75 mm, 79.08 mm, the corresponding installation angle (β y ) is respectively 83.41°, 80.90°, 75.86°, 69.53°, 63.69°, 57.69°, 47.64°, 39.41°, 32.75°, 28.89°, the corresponding profile maximum thickness (T) is respectively 20.39 mm, 20.15 mm, 19.63 mm, 19.24 mm, 18.67 mm, 16.88 mm, 13.42 mm, 10.85 mm, 8.40 mm, 7.23 mm, the corresponding inlet angle (α) is respectively 30.30°, 30.22°, 35.72°, 37.56°, 43.64°, 49.08°, 60.83°, 82.81°, 99.27°, 122.45°, and the corresponding outlet angle (θ) is respectively 25.78°, 25.25°, 25.57°, 22.80°, 21.60°, 21.13°, 20.51°, 20.35°, 20.26°, 19.86°. The blade root (2) is a forked blade root.

2. A 395 mm last stage blade for use on a 100 MW steam turbine as claimed in claim 1, wherein: The total height (K) of the blade root (2) is 88 mm.

3. A 395 mm last stage blade for use on a 100 MW steam turbine as defined in claim 2, wherein: The axial width (W) of the blade root (2) is 97.5 mm.

4. A 395 mm last stage blade for use on a 100 MW steam turbine as defined in claim 3, wherein: The thickness (H) of the shroud (3) is 5.4 mm.

5. A 395 mm last stage blade for use on a 100 MW steam turbine as defined in claim 4, wherein: The axial distance (B1) of the working surface of the shroud (3) is 40.37 mm.

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