CN109707462B - 1450mm titanium alloy final-stage blade of full-speed steam turbine - Google Patents
1450mm titanium alloy final-stage blade of full-speed steam turbine Download PDFInfo
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Abstract
The invention discloses a 1450mm titanium alloy final-stage long blade of a full-speed steam turbine, which comprises a shroud ring, a blade body, a lacing wire, a blade root intermediate body and a blade root which are sequentially connected, wherein the blade body profile is a variable-section twisted blade type, the height H of the blade body is 1450mm, the relative value of the sectional area A of the blade body is gradually reduced to 1.0 from 8.84 along the blade height direction, the relative value of the chord length b1 of the blade body profile is gradually reduced to 1.0 from 1.65, the relative value of the axial width Xa of the blade body profile is gradually reduced to 1.0 from 11.01, the relative value of the circumferential width Xb of the blade body profile is gradually increased to 2.08 from 1.0, the relative value of the maximum thickness W1 of the blade body profile is gradually reduced to 1.0 from 4.23, and the relative value of the installation angle c1 is gradually reduced to 1.0, so that the final-stage titanium alloy final-stage long blade is suitable for supercritical and ultra-high-capacity units of 4F-1200MW grades and 1400MW ultra-critical units.
Description
Technical Field
The invention relates to the field of thermal power generation, in particular to a 1450mm titanium alloy final-stage blade of a full-speed steam turbine.
Background
The development of the last-stage long blade is a key point and a difficult point for building high-parameter and high-capacity unit development. The length of the last stage blade determines the number of low pressure cylinders and the overall length of the steam turbine, and greatly influences the overall efficiency of the steam turbine. At the current level of alloy steel performance, designing longer last stage blades is the most effective way to improve turbine efficiency. With respect to the steel last stage long blades, Mitsubishi has developed a steel 60 inch (1524mm) blade, a prior art 1300mm last stage blade, and 1200mm and 1400mm steel last stage blades for a 3000r/min steam turbine set.
The titanium alloy material has the advantages of high specific strength, good corrosion resistance, low density and the like. However, titanium alloy also has the characteristics of poor vibration attenuation performance, high hot working difficulty, poor weldability and processability and the like. In terms of titanium alloy last-stage-growth blades, there are currently 59 inch (1500mm) blades, 62 inch (1575mm) blades, and A, 49 inch (1244mm) blades. Although the basic structure of the last-stage blade developed by each manufacturer has many similar places, the molded line height and characteristic parameters of the blade, the blade root structure, the shroud band and the lacing wire structure parameters, the application range of the blade and the like have great differences.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provides a 1450mm titanium alloy final-stage long blade of a full-speed steam turbine, which is suitable for a supercritical and ultra-supercritical high-capacity unit with a 4F-1200 MW-1400 MW grade and can also be applied to a supercritical, supercritical and subcritical 2F-600 MW-660 MW condensing steam turbine generator unit and a supercritical, subcritical and combined cycle 1F-250 MW-350 MW condensing steam turbine generator unit.
The purpose of the invention is realized by the following technical scheme:
a1450 mm titanium alloy final-stage-length blade of a full-speed steam turbine comprises a shroud band, a blade body, a lacing wire, a blade root intermediate body and a blade root which are sequentially connected, wherein the blade body profile is a variable-section twisted blade type, the height H of the blade body is 1450mm, the relative value of the sectional area A of the blade body is gradually reduced to 1.0 from 8.84 along the blade height direction, the relative value of the chord length b1 of the blade body profile is gradually reduced to 1.0 from 1.65, the relative value of the axial width Xa of the blade body profile is gradually reduced to 1.0 from 11.01, the relative value of the circumferential width Xb of the blade body profile is gradually increased to 2.08 from 1.0, the relative value of the maximum thickness W1 of the blade body profile is gradually reduced to 1.0 from 4.23, and the relative value of the installation angle c1 is gradually reduced to 1.0 from 10.87.
The invention relates to a 1450mm titanium alloy final-stage blade of a full-speed steam turbine, wherein the actual value of the section area A of the blade body is 15187mm2Gradually decreases to 1722mm2The actual value of the blade profile chord length b1 is gradually reduced to 289.9mm from 478.8mm, the actual value of the blade profile axial width Xa is gradually reduced to 41.8mm from 472.9mm, the actual value of the blade profile circumferential width Xb is gradually increased to 287.5mm from 138.4mm, the actual value of the blade profile maximum thickness W1 is gradually reduced to 8.5mm from 35.8mm, and the actual value of the installation angle c1 is gradually reduced to 7.5 degrees from 81.2 degrees.
The invention relates to a 1450mm titanium alloy final-stage long blade of a full-speed steam turbine, wherein the axial width of a blade root intermediate body is the same as the axial width F of a blade root, the axial width is 520mm, and the sum G of the heights of the blade root intermediate body and the blade root is 147.6 mm.
The 1450mm titanium alloy final-stage blade of the full-speed steam turbine provided by the invention has the advantages that the axial width D of the shroud band is 50-55 mm, and the thickness E of the shroud band is 10-25 mm.
The 1450mm titanium alloy final-stage long blade of the full-speed steam turbine has the advantages that the blade root is a 4-tooth fir-tree-shaped blade root with a large fillet and low stress concentration, and the oblique angle beta of the blade root is 8 degrees.
The 1450mm titanium alloy final-stage long blade of the full-speed steam turbine is characterized in that a positioning groove is formed in the steam outlet side of the bottom of the blade root, and an axial positioning key is placed in the positioning groove.
The invention relates to a 1450mm titanium alloy final-stage long blade of a full-speed steam turbine, wherein an elliptical boss lacing wire is arranged in the middle of a blade body, the boss lacing wire and the blade body are of an integrated structure, and the boss lacing wire comprises a back arc working surface and an inner arc working surface.
The invention relates to a 1450mm titanium alloy final-stage blade of a full-speed steam turbine, which is made of TC 4.
According to the technical scheme, the invention has the beneficial effects that: a1450 mm titanium alloy final-stage long blade of a full-speed steam turbine is provided, so that the full-speed steam turbine is suitable for supercritical and ultra-supercritical high-capacity units of 4F-1200 MW-1400 MW grade, and can also be applied to supercritical, supercritical and subcritical 2F-600 MW-660 MW condensing steam turbine generator units and supercritical, subcritical and combined cycle 1F-250 MW-350 MW condensing steam turbine generator units.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a left side view of the present invention;
FIG. 3 is a schematic view of a blade profile characteristic parameter;
FIG. 4 is a schematic view of blade profile folding;
FIG. 5 is a top view of a blade root platform;
FIG. 6 is a schematic view of the blade and impeller assembly;
FIG. 7 is a schematic illustration of shroud assembly clearance;
FIG. 8 is a schematic view of a lacing wire assembly gap;
FIG. 9 is a schematic view of a spring plate.
The labels in the figure are:
1-blade body, 2-blade root, 3-blade root intermediate, 4-shroud band, 5-lacing wire, 6-positioning groove, 7-axial positioning key, 8-spring piece, 9-shroud band inner arc working surface, 10-shroud band back arc working surface, 11-lacing wire inner arc working surface, 12-lacing wire back arc working surface, 13-steam inlet edge, 14-steam outlet edge, 15-molded line back arc and 16-molded line inner arc.
Detailed Description
The invention will be further described with reference to specific embodiments and the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention
The invention relates to an embodiment of a 1450mm titanium alloy final-stage long blade of a full-speed steam turbine, in particular to a 1450mm titanium alloy final-stage long blade of the full-speed steam turbine, which comprises a shroud band 4, a blade body 1, a lacing wire 5, a blade root intermediate body 3 and a blade root 2 which are connected in sequence, the profile of the blade body 1 is a twisted blade profile with a variable cross section, the height H of the blade body 1 is 1450mm, the relative value of the cross-sectional area A of the blade body is gradually reduced to 1.0 from 8.84 along the blade height direction, the relative value of the chord length b1 of the blade body profile is gradually reduced to 1.0 from 1.65, the relative value of the axial width Xa of the blade body profile is gradually reduced to 1.0 from 11.01, the relative value of the circumferential width Xb of the blade body profile is gradually increased to 2.08 from 1.0, the relative value of the maximum thickness W1 of the blade body profile is gradually reduced to 1.0 from 4.23, and the relative value of the installation angle c1 is gradually reduced to 1.0 from 10.87, the actual value of the section area A of the blade body of the 1450mm titanium alloy final-stage blade of the full-speed steam turbine is 15187 mm.2Gradually decreases to 1722mm2The actual value of blade profile chord length b1 is gradually reduced to 289.9mm by 478.8mm, the actual value of blade profile axial width Xa is gradually reduced to 41.8mm by 472.9mm, the actual value of blade profile circumferential width Xb is gradually increased to 287.5mm by 138.4mm, the actual value of blade profile maximum thickness W1 is gradually reduced to 8.5mm by 35.8mm, the actual value of installation angle c1 is gradually reduced to 7.5 by 81.2 °, the axial width F of blade root intermediate 3 is the same as the axial width F of blade root 2, and all 520mm, the sum G of the heights of blade root intermediate 3 and blade root 2 is 147.6mm, the axial width D of shroud band 4 is 50-55 mm, the thickness E of shroud band 4 is 10-25 mm, blade root 2 is the 4-tooth fir-type blade root that the great fillet low stress concentrates, the oblique set angle β of blade root is 8, the steam outlet side of positioning groove 2 is opened with 6, the blade root is decidedAn axial positioning key 7 is placed in the position groove 6, an oval boss lacing wire 5 is arranged in the middle of the blade body 1, the boss lacing wire 5 and the blade body 1 are of an integrated structure, the boss lacing wire 5 comprises a back arc working surface 12 and an inner arc working surface 11, and the titanium alloy final-stage long blade is made of TC 4.
As shown in fig. 1 and 2. The blade comprises a shroud band 4, a blade body 1, a lacing wire 5, a blade root intermediate body 3 and a blade root 2. And the shroud band 4, the blade body 1, the lacing wire 5, the blade root intermediate body 3 and the blade root 2 are of an integral structure. The blade body 1 is a twisted blade type with a variable cross section. The height of the blade body 1 is 1450 mm.
As shown in fig. 3, the airfoil profile has the following characteristic parameters:
axial width Xa: the axial distance from the profile steam inlet edge 13 to the steam outlet edge 14.
Circumferential width Xb: the circumferential distance of profile back arc 15 to profile inner arc 16.
Chord length b 1: the distance from the steam inlet edge 13 of the profile to the steam outlet edge 14.
Maximum thickness W1: the tangential width of the profile.
Mounting angle c 1: chord length b1 is the angle with the tangential direction (Y direction).
In the present invention, the relative value of the blade body cross-sectional area a is gradually reduced from 8.84 to 1.0 in the height direction of the blade body 1. The relative value of the blade profile chord length b1 gradually decreases from 1.65 to 1.0. The relative value of the axial width Xa of the blade profile line is gradually reduced from 11.01 to 1.0. The relative value of the airfoil profile circumferential width Xb gradually increases from 1.0 to 2.08. The relative value of the maximum blade profile thickness W1 gradually decreases from 4.23 to 1.0. The relative value of the mounting angle c1 gradually decreases from 10.87 to 1.0.
Examples of the blade 1 are given below:
table 1 shows the characteristic parameters of each section
In the above embodiment, the cross-sectional area A of the blade body is 15187mm along the blade height direction2Gradually decreases to 1722mm2. The chord length b1 of the blade profile gradually decreases from 478.8mm to 289.9 mm. The axial width Xa of the blade profile line is gradually reduced from 472.9mm to 41.8 mm. The circumferential width Xb of the blade profile gradually increases from 138.4mm to 287.5 mm. The maximum blade line thickness W1 gradually decreases from 35.8mm to 8.5 mm. The mounting angle c1 gradually decreases from 81.2 ° to 7.5 °.
Further, as shown in fig. 1, the axial width of the blade root intermediate body 3 is the same as the axial width F of the blade root 2, and both are 520 mm; the sum G of the heights of the blade root intermediate body 3 and the blade root 2 is 147.6 mm; the axial width D of the shroud ring 4 is 50-55 mm, and the thickness E of the shroud ring 4 is 10-25 mm.
When the titanium alloy final-stage blade is installed, the blade root 2 is installed in the wheel groove of the rotor, and 58 blades are arranged in total in a whole circle. In the present example, the blade root 2 is a 4-tooth fir-tree blade root with a large fillet and low stress concentration, and the setting angle β of the blade root is 8 °. As shown in fig. 1, a positioning groove is formed in the steam outlet side of the bottom of the blade root 2, and an axial positioning key is placed in the positioning groove, so that the blade is fixed on the impeller, the axial movement of the blade is prevented, and the safe operation of the steam turbine is ensured. As shown in fig. 6, after the blades are assembled, a series of spring strips 8 are inserted at the bottom of the root of each blade to keep the blades in the same position as in the operating condition.
Further, as shown in fig. 8, a boss lacing wire 5 with an elliptical cross section 1 is arranged in the middle of the blade body 1, and the boss lacing wire 5 and the blade body 1 are of an integral structure. The boss lacing wire 5 comprises a lacing wire inner arc working surface 11 and a lacing wire back arc working surface 12, and the lacing wire inner arc working surface 11 is matched with the lacing wire back arc working surface 12. The major axis N of the ellipse is 42-44 mm, and the minor axis M is 22-24 mm. As shown in fig. 7, the shroud 4 includes a shroud inner arc working surface 9 and a shroud back arc working surface 10, and the shroud inner arc working surface 9 matches with the shroud back arc working surface 10. When the titanium alloy last-stage long blade is in an installation state, a gap P is formed between the shroud inner arc working surface 9 and the shroud back arc working surface 10 of the adjacent blade, and the value range of P is 0.1-5 mm. In the installation state, a gap Q is reserved between the lacing wire inner arc working surface 11 and the lacing wire back arc working surface 12 of the adjacent blade, and the value range of Q is 4-7 mm. In a static state, the titanium alloy final-stage blade is of a single-blade structure. In the working state, under the action of centrifugal force, the blade body 1 is twisted, and the corresponding shroud band 4 and the corresponding tie bar 5 are also twisted. The gap P between the shroud inner arc working face 9 and the shroud back arc working face 10 of the adjacent blade will become 0, and the gap Q between the lacing wire inner arc working face 11 and the lacing wire back arc working face 12 of the adjacent blade will become 0. Therefore, the blades are connected into a whole-circle structure, the rigidity of the blades is improved, and the dynamic stress is reduced.
In summary, the 1450mm titanium alloy final-stage blade of the full-speed steam turbine provided by the invention has the following advantages:
1. the steam exhaust area of the titanium alloy final-stage long blade is about 15m2The condensing type steam turbine generator is suitable for supercritical and ultra-supercritical large-capacity units with 4F-1200 MW-1400 MW grades, and can also be popularized and applied to condensing type steam turbine generator units with ultra-supercritical, supercritical and subcritical 2F-600 MW-660 MW, and condensing type steam turbine generator units with supercritical, subcritical and combined cycle 1F-250 MW-350 MW.
2. The 1450mm titanium alloy final-stage long blade of the full-speed steam turbine adopts a full-three-dimensional pneumatic design, the pneumatic loss is greatly reduced, and the moving and static blade profile line has high pneumatic efficiency by carrying out a series of optimization on the moving and static blade profile line.
3. The 1450mm titanium alloy final-stage blade of the full-speed steam turbine adopts a full-circle self-locking damping structure form with a shroud band and a boss lacing wire, and has the characteristics of good vibration characteristic and high safety and reliability
Description of the symbols
A is the cross-sectional area of the blade body.
b1 is the chord length, i.e. the distance from the steam inlet edge 13 to the steam outlet edge 14 of the blade profile.
c1 is the angle of incidence of the blade profile, i.e. the angle between chord b1 and the tangential direction (Y direction).
D is the axial width of the shroud 4.
E is the thickness of the shroud 4.
F is the axial width of the blade root 2.
G is the sum of the heights of the root intermediate 3 and the root 2.
H is the effective height of the blade body, namely the distance between the top section of the blade body and the root section of the blade body.
M is the minor axis of the ellipse.
N is the major axis of the ellipse.
P is the gap between the shroud inner arc working face 9 and the shroud back arc working face 10 of the adjacent blade.
And Q is a gap between the lacing wire inner arc working surface 11 and the lacing wire back arc working surface 12 of the adjacent blade.
U is the axial direction of the rotor coordinate system.
V is the tangent of the rotor coordinate system.
W1 is the maximum thickness of the airfoil profile, i.e., the tangential width of the profile.
X is the axial direction of the linear coordinate system.
Xa is the axial width of the airfoil profile, i.e. the axial distance from the steam inlet edge 13 to the steam outlet edge 14 of the profile.
Xb is the circumferential width of the airfoil profile, i.e. the circumferential distance of the profile back arc 15 to the profile inner arc 16.
Y is the tangent of the linear coordinate system.
Beta is the oblique angle of the blade root, namely the included angle between the central line of the blade root and the axial direction of the rotor.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (5)
1. The 1450mm titanium alloy final-stage-length blade of the full-speed steam turbine is characterized by comprising a shroud band (4), a blade body (1), a lacing wire (5), a blade root intermediate body (3) and a blade root (2) which are sequentially connected, wherein the molded line of the blade body (1) is a variable-section twisted blade type, the height H of the blade body (1) is 1450mm, the relative value of the sectional area A of the blade body is gradually reduced to 1.0 from 8.84 in the blade height direction, the relative value of the chord length b1 of the blade body molded line is gradually reduced to 1.0 from 1.65, and the relative value of the axial width Xa of the blade body molded line is gradually reduced from 11.01To 1.0, the relative value of the circumferential width Xb of the blade profile gradually increases from 1.0 to 2.08, the relative value of the maximum blade profile thickness W1 gradually decreases from 4.23 to 1.0, and the relative value of the installation angle c1 gradually decreases from 10.87 to 1.0; the actual value of the section area A of the blade body is 15187mm2Gradually decreases to 1722mm2The actual value of the blade profile chord length b1 is gradually reduced to 289.9mm from 478.8mm, the actual value of the blade profile axial width Xa is gradually reduced to 41.8mm from 472.9mm, the actual value of the blade profile circumferential width Xb is gradually increased to 287.5mm from 138.4mm, the actual value of the blade profile maximum thickness W1 is gradually reduced to 8.5mm from 35.8mm, and the actual value of the installation angle c1 is gradually reduced to 7.5 degrees from 81.2 degrees; the axial width D of the shroud ring (4) is 50-55 mm, and the thickness E of the shroud ring (4) is 10-25 mm; the blade root (2) is a 4-tooth fir-tree blade root with a large fillet and low stress concentration, and the oblique angle beta of the blade root is 8 degrees.
2. A full speed steam turbine 1450mm titanium alloy last stage blade according to claim 1, wherein: the axial width of the blade root intermediate body (3) is the same as the axial width F of the blade root (2) and is 520mm, and the sum G of the heights of the blade root intermediate body (3) and the blade root (2) is 147.6 mm.
3. A full speed steam turbine 1450mm titanium alloy last stage blade according to claim 1, wherein: a positioning groove (6) is formed in the steam outlet side of the bottom of the blade root (2), and an axial positioning key (7) is placed in the positioning groove (6).
4. A full speed steam turbine 1450mm titanium alloy last stage blade according to claim 1, wherein: the blade body (1) middle part is equipped with oval boss lacing wire (5), boss lacing wire (5) and blade body (1) structure as an organic whole, boss lacing wire (5) are including back arc working face (12) and inner arc working face (11).
5. A full speed steam turbine 1450mm titanium alloy last stage blade according to claim 1, wherein: the titanium alloy final-stage blade is made of TC 4.
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| CN109707462B true CN109707462B (en) | 2022-03-18 |
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| CN109989792A (en) * | 2019-05-24 | 2019-07-09 | 哈尔滨汽轮机厂有限责任公司 | Full rotary speed steam turbine final stage moving blade |
| CN112388280A (en) * | 2019-08-16 | 2021-02-23 | 上海电气电站设备有限公司 | Positioning key installation device and positioning key installation method |
| CN114687806A (en) * | 2020-12-31 | 2022-07-01 | 中国航发商用航空发动机有限责任公司 | Impeller mechanical blade, molding method thereof and impeller machine |
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