Two-stage gas turbine, stationary blade and moving blade used for the two-stage gas turbine

Abstract

The present invention provides a two-stage gas turbine, a stationary blade and a moving blade for the two-stage gas turbine, comprising a casing and a rotating shaft installed in the casing, a stationary blade installed on the casing, a moving blade installed on the hub of the rotating shaft, two-stage stationary blades installed in sequence along the axial direction on the casing, and two-stage moving blades installed in sequence along the axial direction on the rotating shaft, and the stationary blades and the moving blades are arranged alternately in sequence. The two-stage stationary blades are respectively a first-stage stationary blade and a second-stage stationary blade; the two-stage moving blades are respectively a first-stage moving blade and a second-stage moving blade; the gas turbine of the present invention has a greatly improved efficiency compared with the known two-stage gas turbine, and the efficiency of the final optimized solution is improved by 3%. Taking a 20,000 kW gas turbine as an example, the energy-saving effect is based on the original solution, and about 4.8 million kWh of electricity can be recovered per year.

Description

Technical Field

[0001] The invention belongs to the field of blast furnace metallurgy and relates to an energy recovery turbine unit, in particular to a two-stage coal gas turbine, and stationary blades and moving blades used for the two-stage coal gas turbine. Background Art

[0002] The blast furnace gas waste pressure turbine power generation device is a high-efficiency and energy-saving equipment that recovers blast furnace gas energy and adjusts furnace top pressure in the blast furnace ironmaking process. It is a technology-intensive turbine machinery.

[0003] At present, the development trend of blast furnaces is towards medium and large-scale development, which puts forward higher requirements on the efficiency of blast furnace gas energy recovery turbines. The blade shape of blast furnace gas energy recovery turbines directly determines its efficiency, so it is necessary to match the blast furnace process and develop new blade shapes to further improve the efficiency of energy recovery turbines. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a two-stage gas turbine, stationary blades and moving blades for the two-stage gas turbine, to solve the technical problem that the energy-saving effect of the gas turbine in the prior art needs to be further improved, and to further improve the energy-saving effect of the gas turbine in a breakthrough manner.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

[0006] A two-stage gas turbine comprises a casing and a rotating shaft installed in the casing, the casing is provided with stationary blades, the hub of the rotating shaft is provided with moving blades, two stages of stationary blades are sequentially installed on the casing along the axial direction, two stages of moving blades are sequentially installed on the rotating shaft along the axial direction, and the stationary blades and the moving blades are arranged alternately in sequence;

[0007] The two stages of stationary blades are respectively the first stage stationary blades and the second stage stationary blades;

[0008] The two-stage moving blades are respectively the first-stage moving blades and the second-stage moving blades;

[0009] The first-stage stationary blade, the second-stage stationary blade, the first-stage moving blade and the second-stage moving blade each include three blade profile sections, namely, a first blade profile section, a second blade profile section and a third blade profile section, each of the first blade profile section, the second blade profile section and the third blade profile section includes a pressure surface blade profile line and a suction surface blade profile line;

[0010] The section height of the first blade section of the first-stage stationary blade is 532 mm, and the pressure surface blade line of the first blade section is y=-4×10 -5 x 3 -0.004x 2 -0.677x-9.123, the suction surface profile of the first blade section is y=-1×10 -5 x3 -0.012x 2 -0.765x+22.63;

[0011] The section height of the second blade section of the first-stage stationary blade is 654 mm, and the pressure surface blade line of the second blade section is y=-3×10 -5 x 3 -0.003x 2 -0.659x-10.99, the suction surface profile of the second blade section is y=-8×10 -6 x 3 -0.010x 2 -0.731x+27.75;

[0012] The section height of the third blade section of the first-stage stationary blade is 837 mm, and the pressure surface blade line of the third blade section is y=-2×10 -5 x 3 -0.002x 2 -0.659x-15.21, the suction surface profile of the third blade section is y=-8×10 -6 x 3 -0.008x 2 -0.682x+35.98;

[0013] The section height of the first blade section of the secondary stationary blade is 534 mm, and the pressure surface blade line of the first blade section is y=-9×10 -5 x 3 -0.009x 2 -0.712x-6.257, the suction surface profile of the first blade section is y=-9×10 -5 x 3 -0.018x 2 -0.691x+21.04;

[0014] The section height of the second blade section of the secondary stationary blade is 676 mm, and the pressure surface blade line of the second blade section is y=-5×10 -5 x 3 -0.007x 2 -0.631x-6.790, the suction surface profile of the second blade section is y=-6×10 -5 x 3 -0.013x 2 -0.596x+26.7;

[0015] The section height of the third blade section of the secondary stationary blade is 889 mm; the pressure surface blade line of the third blade section is y=-3×10 -5x 3 -0.004x 2 -0.772x-14.95, the suction surface profile of the third blade section is y=-5×10 -5 x 3 -0.011x 2 -0.684x+36.02;

[0016] The section height of the first blade section of the first-stage moving blade is 560 mm, and the pressure surface blade line of the first blade section is y=-4×10 -6 x 3 -0.002x 2 -0.150x-14.96, the suction surface profile of the first blade section is y=-8×10 -6 x 3 -0.004x 2 -0.102x+47.74;

[0017] The section height of the second blade section of the first-stage moving blade is 664 mm, and the pressure surface blade line of the second blade section is y=-4×10 -6 x 3 -0.003x 2 -0.638x-10.33, the suction surface profile of the second blade section is y=-1×10 -5 x 3 -0.007x 2 -0.592x+41.57;

[0018] The section height of the third blade section of the first-stage moving blade is 872 mm, and the pressure surface blade line of the third blade section is y=3×10 -5 x 3 -0.004x 2 -1.837x-5.573, the suction surface profile of the third blade section is y=5×10 -5 x 3 -0.009x 2 -1.899x+26.10;

[0019] The section height of the first blade section of the secondary moving blade is 560 mm, and the pressure surface blade line of the first blade section is y=-5×10 -6 x 3 -0.002x 2 -0.118x-18.42, the suction surface profile of the first blade section is y=-1×10 -5 x 3 -0.004x 2 -0.070x+49.15;

[0020] The section height of the second blade section of the secondary moving blade is 740 mm, and the pressure surface blade line of the second blade section is y=6×10 -6 x 3 -0.004x 2 -1.100x-12.87, the suction surface profile of the second blade section is y=-5×10 -6 x 3 -0.010x 2 -1.042x+39.20;

[0021] The section height of the third blade section of the secondary moving blade is 920 mm, and the pressure surface blade line of the third blade section is y=3×10 -5 x 3 -0.003x 2 -1.994x-8.547, the suction surface profile of the third blade section is y=3×10 -5 x 3 -0.009x-1.993x+24.47;

[0022] in:

[0023] x and y are the horizontal and vertical coordinates in the Oxyz coordinate system respectively; z is the vertical coordinate in the Oxyz coordinate system;

[0024] In the Oxyz coordinate system, the rotation center of the gas turbine where the blade is located is taken as the horizontal coordinate x, and the height direction of the blade passing through the center of gravity of the blade is taken as the vertical coordinate z, that is, the direction of the cross-sectional heights of the first blade section, the second blade section and the third blade section; the intersection of the horizontal coordinate x and the vertical coordinate z is taken as the coordinate origin O, that is, the projection point of the center of gravity of the blade along the vertical coordinate z on the horizontal coordinate x is taken as the coordinate origin O; the direction passing through the coordinate origin O and perpendicular to the Oxz plane is taken as the vertical coordinate y.

[0025] The present invention also has the following technical features:

[0026] The number of blades of the first-stage stationary blades is 28, and the number of blades of the second-stage stationary blades is 34.

[0027] The number of blades of the first-stage moving blades is 23, and the number of blades of the second-stage moving blades is 23.

[0028] The present invention also protects a stationary blade for a two-stage gas turbine, the stationary blade comprising three blade profile sections, namely a first blade profile section, a second blade profile section and a third blade profile section, each of the first blade profile section, the second blade profile section and the third blade profile section comprising a pressure surface blade profile line and a suction surface blade profile line;

[0029] The section height of the first blade section of the stationary blade is 532 mm, and the pressure surface blade line of the first blade section is y=-4×10 -5 x 3 -0.004x 2 -0.677x-9.123, the suction surface profile of the first blade section is y=-1×10 - 5 x 3 -0.012x 2 -0.765x+22.63;

[0030] The section height of the second blade section of the stationary blade is 654 mm, and the pressure surface blade line of the second blade section is y=-3×10 -5 x 3 -0.003x 2 -0.659x-10.99, the suction surface profile of the second blade section is y=-8×10 - 6 x 3 -0.010x 2 -0.731x+27.75;

[0031] The section height of the third blade section of the stationary blade is 837 mm, and the pressure surface blade line of the third blade section is y=-2×10 -5 x 3 -0.002x 2 -0.659x-15.21, the suction surface profile of the third blade section is y=-8×10 - 6 x 3 -0.008x 2 -0.682x+35.98.

[0032] The present invention also protects a stationary blade for a two-stage gas turbine, the stationary blade comprising three blade profile sections, namely a first blade profile section, a second blade profile section and a third blade profile section, each of the first blade profile section, the second blade profile section and the third blade profile section comprising a pressure surface blade profile line and a suction surface blade profile line;

[0033] The section height of the first blade section of the stationary blade is 534 mm, and the pressure surface blade line of the first blade section is y=-9×10 -5 x 3 -0.009x 2 -0.712x-6.257, the suction surface profile of the first blade section is y=-9×10 - 5 x 3 -0.018x 2-0.691x+21.04;

[0034] The section height of the second blade section of the stationary blade is 676 mm, and the pressure surface blade line of the second blade section is y=-5×10 -5 x 3 -0.007x 2 -0.631x-6.790, the suction surface profile of the second blade section is y=-6×10 - 5 x 3 -0.013x 2 -0.596x+26.7;

[0035] The section height of the third blade section of the stationary blade is 889 mm; the pressure surface blade line of the third blade section is y=-3×10 -5 x 3 -0.004x 2 -0.772x-14.95, the suction surface profile of the third blade section is y=-5×10 - 5 x 3 -0.011x 2 -0.684x+36.02.

[0036] The present invention also protects a moving blade for a two-stage gas turbine, the moving blade comprising three blade profile sections, namely a first blade profile section, a second blade profile section and a third blade profile section, each of the first blade profile section, the second blade profile section and the third blade profile section comprising a pressure surface blade profile line and a suction surface blade profile line;

[0037] The section height of the first blade section of the moving blade is 560 mm, and the pressure surface blade line of the first blade section is y=-4×10 -6 x 3 -0.002x 2 -0.150x-14.96, the suction surface profile of the first blade section is y=-8×10 - 6 x 3 -0.004x 2 -0.102x+47.74;

[0038] The section height of the second blade section of the moving blade is 664 mm, and the pressure surface blade line of the second blade section is y=-4×10 -6 x 3 -0.003x 2 -0.638x-10.33, the suction surface profile of the second blade section is y=-1×10 -5 x 3 -0.007x 2 -0.592x+41.57;

[0039] The section height of the third blade section of the moving blade is 872 mm, and the pressure surface blade line of the third blade section is y=3×10 -5 x 3 -0.004x 2 -1.837x-5.573, the suction surface profile of the third blade section is y=5×10 -5 x 3 -0.009x 2 -1.899x+26.10.

[0040] The present invention also protects a moving blade for a two-stage gas turbine, characterized in that the moving blade includes three blade profile sections, namely a first blade profile section, a second blade profile section and a third blade profile section, each of the first blade profile section, the second blade profile section and the third blade profile section includes a pressure surface blade profile line and a suction surface blade profile line;

[0041] The section height of the first blade section of the moving blade is 560 mm, and the pressure surface blade line of the first blade section is y=-5×10 -6 x 3 -0.002x 2 -0.118x-18.42, the suction surface profile of the first blade section is y=-1×10 - 5 x 3 -0.004x 2 -0.070x+49.15;

[0042] The section height of the second blade section of the moving blade is 740 mm, and the pressure surface blade line of the second blade section is y=6×10 -6 x 3 -0.004x 2 -1.100x-12.87, the suction surface profile of the second blade section is y=-5×10 - 6 x 3 -0.010x 2 -1.042x+39.20;

[0043] The section height of the third blade section of the moving blade is 920 mm, and the pressure surface blade line of the third blade section is y=3×10 -5 x 3 -0.003x 2-1.994x-8.547, the suction surface profile of the third blade section is y=3×10 -5 x 3 -0.009x-1.993x+24.47.

[0044] Compared with the prior art, the present invention has the following technical effects:

[0045] Compared with the existing two-stage gas turbine, the gas turbine of the present invention has greatly improved efficiency, with the highest efficiency improvement of 3%. Taking a 20,000 kW gas turbine as an example, the energy-saving effect is based on the existing two-stage gas turbine, and about 4.8 million kWh of electricity can be recovered per unit per year. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a schematic diagram of the structural principles of the stationary blades, moving blades, and meridian flow passages.

[0047] Figure 2 It is a schematic diagram of the three blade cross-section positions of each moving and stationary blade and the corresponding pressure and suction surface blade profile lines.

[0048] FIG3( a ) is a schematic diagram of the total pressure distribution of Example 1 calculated by CFD.

[0049] FIG3( b ) is a schematic diagram of velocity vector distribution of Example 1 calculated by CFD.

[0050] Figure 4 It is a schematic structural diagram of the upper and lower walls of the meridian flow channel of the gas turbine of the present invention.

[0051] Figure 5 It is a schematic diagram of the two-dimensional structure of the first and second stage moving and stationary blades of the present invention.

[0052] Figure 6 It is a schematic diagram of the three-dimensional structure of the first and second stage moving and stationary blades of the present invention.

[0053] Figure 7 It is a schematic diagram of the two-dimensional structure of the first and second stage moving and stationary blades of comparative example 1.

[0054] Figure 8 It is a schematic diagram of the three-dimensional structure of the first and second stage moving and stationary blades of comparative example 1.

[0055] The meanings of the numbers in the figure are: 1-casing, 2-rotating shaft, 3-hub, 4-stationary blade, 5-moving blade; 401-first-stage stationary blade, 402-second-stage stationary blade; 501-first-stage moving blade, 502-second-stage moving blade.

[0056] The specific contents of the present invention are further explained in detail below in conjunction with embodiments. DETAILED DESCRIPTION

[0057] In the present invention, the upper and lower walls of the meridian flow channel are as follows Figure 1 As shown, the upper wall of the meridian flow passage is the casing 1, and the lower wall of the meridian flow passage is the hub 3. The three blade section positions of each moving and stationary blade and the corresponding pressure surface and suction surface blade profile lines are shown in Figure 2 As shown, each pressure surface or suction surface blade profile line is fitted to obtain the corresponding blade profile line function.

[0058] Figure 2 In the figure, AA is the first blade section, BB is the second blade section, CC is the third blade section, AAa is the pressure surface blade profile of the first blade section, AAb is the suction surface blade profile of the first blade section; BBa is the pressure surface blade profile of the second blade section, BBb is the suction surface blade profile of the second blade section, CCa is the pressure surface blade profile of the third blade section, CCb is the suction surface blade profile of the third blade section; H A is the height of the first blade section, H B is the height of the second blade section, H C is the height of the third blade section.

[0059] In the present invention, the first blade section is the section closest to the blade and the rotation center; the third blade section is the section farthest from the blade and the rotation center; the second blade section is a blade section between the first blade section and the third blade section.

[0060] In the present invention:

[0061] x and y are the horizontal and vertical coordinates in the Oxyz coordinate system respectively; z is the vertical coordinate in the Oxyz coordinate system;

[0062] In the Oxyz coordinate system, the rotation center of the gas turbine where the blade is located is taken as the horizontal coordinate x, and the height direction of the blade passing through the center of gravity of the blade is taken as the vertical coordinate z, that is, the direction of the cross-sectional heights of the first blade section, the second blade section and the third blade section; the intersection of the horizontal coordinate x and the vertical coordinate z is taken as the coordinate origin O, that is, the projection point of the center of gravity of the blade along the vertical coordinate z on the horizontal coordinate x is taken as the coordinate origin O; the direction passing through the coordinate origin O and perpendicular to the Oxz plane is taken as the vertical coordinate y.

[0063] In the Oxyz coordinate system, the units of x, y, and z are all mm.

[0064] The above blades refer to stationary blades or moving blades.

[0065] In the present invention, the first blade section, the second blade section and the third blade section are all sections parallel to the Oxy plane, that is, they are all sections perpendicular to the vertical coordinate z. The section height of the first blade section, the section height of the second blade section and the section height of the third blade section refer to the height of the first blade section, the second blade section and the third blade section from the Oxy plane, that is, the distance of the first blade section, the second blade section and the third blade section from the rotation center of the gas turbine.

[0066] In the present invention, the first blade section, the second blade section and the third blade section are all sections parallel to the Oxy plane, that is, they are all sections perpendicular to the vertical coordinate z. The section height of the first blade section, the section height of the second blade section and the section height of the third blade section refer to the height of the first blade section, the second blade section and the third blade section from the Oxy plane, that is, the distance of the first blade section, the second blade section and the third blade section from the rotation center of the gas turbine.

[0067] In the present invention, CFD refers to computational fluid dynamics analysis. The efficiency of the gas turbine is isentropic efficiency, which is calculated or obtained using the CFD method. The CFD method is a commonly used method known in the art.

[0068] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0069] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0070] Embodiment 1:

[0071] Following the above technical solution, Figure 3(a) to Figure 6 As shown, this embodiment provides a two-stage gas turbine, comprising a casing 1 and a rotating shaft 2 installed in the casing 1, a stationary blade 4 is installed on the casing 1, a moving blade 5 is installed on the hub 3 of the rotating shaft 2, two stages of stationary blades 4 are sequentially installed on the casing 1 along the axial direction, and two stages of moving blades 5 are sequentially installed on the rotating shaft 2 along the axial direction, and the stationary blades 4 and the moving blades 5 are arranged alternately in sequence;

[0072] The two-stage stationary blades 4 are respectively a first-stage stationary blade 401 and a second-stage stationary blade 402;

[0073] The two-stage moving blades 5 are respectively a first-stage moving blade 501 and a second-stage moving blade 502;

[0074] The first-stage stationary blade 401, the second-stage stationary blade 402, the first-stage moving blade 501 and the second-stage moving blade 502 each include three blade profile sections, namely, a first blade profile section, a second blade profile section and a third blade profile section, and each of the first blade profile section, the second blade profile section and the third blade profile section includes a pressure surface blade profile line and a suction surface blade profile line;

[0075] Specifically, the section height of the first blade section of the first-stage stationary blade 401 is 532 mm, and the pressure surface blade profile line of the first blade section is y=-4×10 -5 x 3 -0.004x 2 -0.677x-9.123, the suction surface profile of the first blade section is y=-1×10 -5 x 3 -0.012x 2 -0.765x+22.63;

[0076] Specifically, the section height of the second blade section of the first-stage stationary blade 401 is 654 mm, and the pressure surface blade line of the second blade section is y=-3×10 -5 x 3 -0.003x 2 -0.659x-10.99, the suction surface profile of the second blade section is y=-8×10 -6 x 3 -0.010x 2 -0.731x+27.75;

[0077] Specifically, the section height of the third blade section of the first-stage stationary blade 401 is 837 mm, and the pressure surface blade profile line of the third blade section is y=-2×10 -5 x 3 -0.002x 2 -0.659x-15.21, the suction surface profile of the third blade section is y=-8×10 -6 x 3 -0.008x 2 -0.682x+35.98;

[0078] Specifically, the cross-sectional height of the first blade section of the secondary stationary blade 402 is 534 mm, and the pressure surface blade profile line of the first blade section is y=-9×10 -5 x 3 -0.009x 2 -0.712x-6.257, the suction surface profile of the first blade section is y=-9×10 -5 x 3 -0.018x 2 -0.691x+21.04;

[0079] Specifically, the section height of the second blade section of the secondary stationary blade 402 is 676 mm, and the pressure surface blade profile line of the second blade section is y=-5×10 -5 x 3 -0.007x 2 -0.631x-6.790, the suction surface profile of the second blade section is y=-6×10 -5 x 3 -0.013x 2 -0.596x+26.7;

[0080] Specifically, the section height of the third blade section of the second-stage stationary blade 402 is 889 mm; the pressure surface blade profile line of the third blade section is y=-3×10 -5 x 3 -0.004x 2 -0.772x-14.95, the suction surface profile of the third blade section is y=-5×10 -5 x 3 -0.011x 2 -0.684x+36.02;

[0081] Specifically, the cross-sectional height of the first blade section of the first-stage moving blade 501 is 560 mm, and the pressure surface blade profile line of the first blade section is y=-4×10 -6 x 3 -0.002x 2 -0.150x-14.96, the suction surface profile of the first blade section is y=-8×10 -6 x 3 -0.004x 2 -0.102x+47.74;

[0082] Specifically, the section height of the second blade section of the first-stage moving blade 501 is 664 mm, and the pressure surface blade profile line of the second blade section is y=-4×10 -6 x 3 -0.003x 2 -0.638x-10.33, the suction surface profile of the second blade section is y=-1×10 -5 x 3 -0.007x 2 -0.592x+41.57;

[0083] Specifically, the section height of the third blade section of the first-stage moving blade 501 is 872 mm, and the pressure surface blade profile line of the third blade section is y=3×10 -5 x 3 -0.004x2 -1.837x-5.573, the suction surface profile of the third blade section is y=5×10 -5 x 3 -0.009x 2 -1.899x+26.10;

[0084] Specifically, the cross-sectional height of the first blade section of the secondary moving blade 502 is 560 mm, and the pressure surface blade profile line of the first blade section is y=-5×10 -6 x 3 -0.002x 2 -0.118x-18.42, the suction surface profile of the first blade section is y=-1×10 -5 x 3 -0.004x 2 -0.070x+49.15;

[0085] Specifically, the section height of the second blade section of the secondary moving blade 502 is 740 mm, and the pressure surface blade line of the second blade section is y=6×10 -6 x 3 -0.004x 2 -1.100x-12.87, the suction surface profile of the second blade section is y=-5×10 -6 x 3 -0.010x 2 -1.042x+39.20;

[0086] Specifically, the section height of the third blade section of the secondary moving blade 502 is 920 mm, and the pressure surface blade line of the third blade section is y=3×10 -5 x 3 -0.003x 2 -1.994x-8.547, the suction surface profile of the third blade section is y=3×10 -5 x 3 -0.009x-1.993x+24.47.

[0087] Specifically, the number of blades of the first-stage stationary blade 401 is 28, and the number of blades of the second-stage stationary blade 402 is 34.

[0088] Specifically, the number of blades of the first-stage moving blade 501 is 23, and the number of blades of the second-stage moving blade 502 is 23.

[0089] CFD verification shows that the efficiency of the gas turbine in Example 1 is improved by 3% compared with the gas turbine in Comparative Example 1.

[0090] Comparative Example 1:

[0091] This comparative example provides an existing energy-saving gas turbine. The main structure of the energy-saving gas turbine is the same as the main structure of the two-stage gas turbine in Example 1. Figure 7 and Figure 8 As shown, the only difference is that the first-stage stationary blade 401, the second-stage stationary blade 402, the first-stage moving blade 501 and the second-stage moving blade 502 are different. And the number of blades of the first-stage stationary blade 401 and the second-stage stationary blade 402 are different.

[0092] In this comparative example, the cross-sectional height of the first blade section of the first-stage stationary blade 401 is 537 mm, and the pressure surface blade profile line of the first blade section is y=-1×10 -5 x 3 -0.002x 2 -0.912x-14.63, the suction surface profile of the first blade section is y=4×10 -5 x 3 -0.006x 2 -1.277x+24.31;

[0093] In this comparative example, the cross-sectional height of the second blade section of the first-stage stationary blade 401 is 624 mm, and the pressure surface blade profile line of the second blade section is y=-1×10 -5 x 3 -0.002x 2 -0.911x-17.47, the suction surface profile of the second blade section is y=3×10 -5 x 3 -0.005x 2 -1.276x+27.86;

[0094] In this comparative example, the section height of the third blade section of the first-stage stationary blade 401 is 843 mm, and the pressure surface blade profile line of the third blade section is y=-5×10 -6 x 3 -0.001x 2 -0.915x-24.50, the suction surface profile of the third blade section is y=2×10 -5 x 3 -0.004x 2 -1.281x+36.94;

[0095] In this comparative example, the cross-sectional height of the first blade section of the secondary stationary blade 402 is 522.5 mm, and the pressure surface blade profile line of the first blade section is y=-4×10 -5 5x 3 -0.005x 2 -0.721x-7.337, the suction surface profile of the first blade section is y=3×10 -5 x3 -0.014x 2 -0.813x+24.89;

[0096] In this comparative example, the cross-sectional height of the second blade section of the secondary stationary blade 402 is 717.5 mm, and the pressure surface blade profile line of the second blade section is y=-2×10 -5 x 3 -0.003x 2 -0.733x-13.91, the suction surface profile of the second blade section is y=2×10 -5 x 3 -0.009x 2 -0.897x+33.37;

[0097] In this comparative example, the section height of the third blade section of the second-stage stationary blade 402 is 912.5 mm; the pressure surface blade profile line of the third blade section is y=-6×10 -6 x 3 -0.001x 2 -0.686x-20.90, the suction surface profile of the third blade section is y=1×10 -5 x 3 -0.006x 2 -0.872x+41.76;

[0098] In this comparative example, the cross-sectional height of the first blade section of the first-stage moving blade 501 is 560 mm, and the pressure surface blade profile line of the first blade section is y=-3×10 -6 x 3 -0.002x 2 -0.087x-12.49, the suction surface profile of the first blade section is y=-5×10 -6 x 3 -0.004x 2 -0.108x+47.20;

[0099] In this comparative example, the cross-sectional height of the second blade section of the first-stage moving blade 501 is 725 mm, and the pressure surface blade profile line of the second blade section is y=-9×10 -6 x 3 -0.002x 2 -0.901x-15.74, the suction surface profile of the second blade section is y=5×10 -6 x 3 -0.007x 2 -0.998x+35.42;

[0100] In this comparative example, the section height of the third blade section of the first-stage moving blade 501 is 986 mm, and the pressure surface blade profile line of the third blade section is y=-2×10 -5 x 3 -0.004x 2 -2.198x-7.184, the suction surface profile of the third blade section is y=-2×10 -5 x 3 -0.007x 2 -2.188x+14.91;

[0101] In this comparative example, the structure of the secondary moving blade 502 is completely the same as that of the primary moving blade 501 .

[0102] In this comparative example, the number of blades of the first-stage stationary blades is 20, and the number of blades of the second-stage stationary blades is 30.

[0103] In this comparative example, the number of blades of the first-stage moving blade is 23, and the number of blades of the second-stage moving blade is 23.

[0104] Embodiment 2:

[0105] This embodiment provides a stator blade for a two-stage gas turbine, such as Figure 5 and Figure 6 As shown, the stationary blade includes three blade profile sections, namely a first blade profile section, a second blade profile section and a third blade profile section, each of which includes a pressure surface blade profile line and a suction surface blade profile line;

[0106] The section height of the first blade section of the stationary blade is 532mm, and the pressure surface blade line of the first blade section is y=-4×10 -5 x 3 -0.004x 2 -0.677x-9.123, the suction surface profile of the first blade section is y=-1×10 -5 x 3 -0.012x 2 -0.765x+22.63;

[0107] The section height of the second blade section of the stationary blade is 654mm, and the pressure surface blade line of the second blade section is y=-3×10 -5 x 3 -0.003x 2 -0.659x-10.99, the suction surface profile of the second blade section is y=-8×10 -6 x 3 -0.010x 2 -0.731x+27.75;

[0108] The section height of the third blade section of the stationary blade is 837mm, and the pressure surface blade line of the third blade section is y=-2×10 -5 x 3 -0.002x 2 -0.659x-15.21, the suction surface profile of the third blade section is y=-8×10 -6 x 3 -0.008x 2 -0.682x+35.98.

[0109] Embodiment 3:

[0110] This embodiment provides a stator blade for a two-stage gas turbine, such as Figure 5 and Figure 6 As shown, the stationary blade includes three blade profile sections, namely a first blade profile section, a second blade profile section and a third blade profile section, each of which includes a pressure surface blade profile line and a suction surface blade profile line;

[0111] The section height of the first blade section of the stationary blade is 534mm, and the pressure surface blade line of the first blade section is y=-9×10 -5 x 3 -0.009x 2 -0.712x-6.257, the suction surface profile of the first blade section is y=-9×10 -5 x 3 -0.018x 2 -0.691x+21.04;

[0112] The section height of the second blade section of the stationary blade is 676mm, and the pressure surface blade line of the second blade section is y=-5×10 -5 x 3 -0.007x 2 -0.631x-6.790, the suction surface profile of the second blade section is y=-6×10 -5 x 3 -0.013x 2 -0.596x+26.7;

[0113] The section height of the third blade section of the stationary blade is 889mm; the pressure surface blade line of the third blade section is y=-3×10 -5 x 3 -0.004x 2 -0.772x-14.95, the suction surface profile of the third blade section is y=-5×10 -5 x 3 -0.011x2 -0.684x+36.02.

[0114] Embodiment 4:

[0115] This embodiment provides a moving blade for a two-stage gas turbine, such as Figure 5 and Figure 6 As shown, the moving blade includes three blade profile sections, namely a first blade profile section, a second blade profile section and a third blade profile section, each of which includes a pressure surface blade profile line and a suction surface blade profile line;

[0116] The section height of the first blade section of the moving blade is 560 mm, and the pressure surface blade line of the first blade section is y=-4×10 -6 x 3 -0.002x 2 -0.150x-14.96, the suction surface profile of the first blade section is y=-8×10 -6 x 3 -0.004x 2 -0.102x+47.74;

[0117] The section height of the second blade section of the moving blade is 664mm, and the pressure surface blade line of the second blade section is y=-4×10 -6 x 3 -0.003x 2 -0.638x-10.33, the suction surface profile of the second blade section is y=-1×10 -5 x 3 -0.007x 2 -0.592x+41.57;

[0118] The section height of the third blade section of the moving blade is 872 mm, and the pressure surface blade line of the third blade section is y=3×10 -5 x 3 -0.004x 2 -1.837x-5.573, the suction surface profile of the third blade section is y=5×10 -5 x 3 -0.009x 2 -1.899x+26.10.

[0119] Embodiment 5:

[0120] This embodiment provides a moving blade for a two-stage gas turbine, such as Figure 5 and Figure 6As shown, the moving blade includes three blade profile sections, namely a first blade profile section, a second blade profile section and a third blade profile section, each of which includes a pressure surface blade profile line and a suction surface blade profile line;

[0121] The section height of the first blade section of the moving blade is 560 mm, and the pressure surface blade line of the first blade section is y=-5×10 -6 x 3 -0.002x 2 -0.118x-18.42, the suction surface profile of the first blade section is y=-1×10 -5 x 3 -0.004x 2 -0.070x+49.15;

[0122] The section height of the second blade section of the moving blade is 740 mm, and the pressure surface blade line of the second blade section is y=6×10 -6 x 3 -0.004x 2 -1.100x-12.87, the suction surface profile of the second blade section is y=-5×10 -6 x 3 -0.010x 2 -1.042x+39.20;

[0123] The section height of the third blade section of the moving blade is 920 mm, and the pressure surface blade line of the third blade section is y=3×10 -5 x 3 -0.003x 2 -1.994x-8.547, the suction surface profile of the third blade section is y=3×10 -5 x 3 -0.009x-1.993x+24.47.

Claims

1. A two-stage gas turbine, comprising a casing (1) and a rotating shaft (2) installed in the casing (1), wherein stationary blades (4) are installed on the casing (1), and moving blades (5) are installed on the hub (3) of the rotating shaft (2), two stages of stationary blades (4) are installed in sequence along the axial direction on the casing (1), and two stages of moving blades (5) are installed in sequence along the axial direction on the rotating shaft (2), and the stationary blades (4) and the moving blades (5) are arranged alternately in sequence; The two-stage stationary blades (4) are respectively a first-stage stationary blade (401) and a second-stage stationary blade (402); The two-stage moving blades (5) are respectively a first-stage moving blade (501) and a second-stage moving blade (502); Features: The first-stage stationary blade (401), the second-stage stationary blade (402), the first-stage moving blade (501) and the second-stage moving blade (502) all include three blade profile sections, namely a first blade profile section, a second blade profile section and a third blade profile section, and each of the first blade profile section, the second blade profile section and the third blade profile section includes a pressure surface blade profile line and a suction surface blade profile line; The section height of the first blade section of the first-stage stationary blade (401) is 532 mm, and the pressure surface blade line of the first blade section is y=-4×10 -5 x 3 -0.004x 2 -0.677x-9.123, the suction surface profile of the first blade section is y=-1×10 -5 x 3 -0.012x 2 -0.765x+22.63; The section height of the second blade section of the first-stage stationary blade (401) is 654 mm, and the pressure surface blade line of the second blade section is y=-3×10 -5 x 3 -0.003x 2 -0.659x-10.99, the suction surface profile of the second blade section is y=-8×10 -6 x 3 -0.010x 2 -0.731x+27.75; The section height of the third blade section of the first-stage stationary blade (401) is 837 mm, and the pressure surface blade line of the third blade section is y=-2×10 -5 x 3 -0.002x 2 -0.659x-15.21, the suction surface profile line of the third blade section is y=-8×10 -6 x 3 -0.008x 2 -0.682x+35.98; The cross-sectional height of the first blade section of the secondary stationary blade (402) is 534 mm, and the pressure surface blade profile line of the first blade section is y=-9×10 -5 x 3 -0.009x 2 -0.712x-6.257, the suction surface profile of the first blade section is y=-9×10 -5 x 3 -0.018x 2 -0.691x+21.04; The section height of the second blade section of the secondary stationary blade (402) is 676 mm, and the pressure surface blade line of the second blade section is y=-5×10 -5 x 3 -0.007x 2 -0.631x-6.790, the suction surface profile of the second blade section is y=-6×10 -5 x 3 -0.013x 2 -0.596x+26.7; The section height of the third blade section of the secondary stationary blade (402) is 889 mm; the pressure surface blade line of the third blade section is y=-3×10 -5 x 3 -0.004x 2 -0.772x-14.95, the suction surface profile line of the third blade section is y=-5×10 -5 x 3 -0.011x 2 -0.684x+36.02; The section height of the first blade section of the first-stage moving blade (501) is 560 mm, and the pressure surface blade line of the first blade section is y=-4×10 -6 x 3 -0.002x 2 -0.150x-14.96, the suction surface profile line of the first blade section is y=-8×10 -6 x 3 -0.004x 2 -0.102x+47.74; The section height of the second blade section of the first-stage moving blade (501) is 664 mm, and the pressure surface blade line of the second blade section is y=-4×10 -6 x 3 -0.003x 2 -0.638x-10.33, the suction surface profile of the second blade section is y=-1×10 -5 x 3 -0.007x 2 -0.592x+41.57; The section height of the third blade section of the first-stage moving blade (501) is 872 mm, and the pressure surface blade line of the third blade section is y=3×10 -5 x 3 -0.004x 2 -1.837x-5.573, the suction surface profile of the third blade section is y=5×10 -5 x 3 -0.009x 2 -1.899x+26.10; The cross-sectional height of the first blade section of the secondary moving blade (502) is 560 mm, and the pressure surface blade profile line of the first blade section is y=-5×10 -6 x 3 -0.002x 2 -0.118x-18.42, the suction surface profile of the first blade section is y=-1×10 -5 x 3 -0.004x 2 -0.070x+49.15; The section height of the second blade section of the secondary moving blade (502) is 740 mm, and the pressure surface blade line of the second blade section is y=6×10 -6 x 3 -0.004x 2 -1.100x-12.87, the suction surface profile line of the second blade section is y=-5×10 -6 x 3 -0.010x 2 -1.042x+39.20; The section height of the third blade section of the secondary moving blade (502) is 920 mm, and the pressure surface blade line of the third blade section is y=3×10 -5 x 3 -0.003x 2 -1.994x-8.547, the suction surface profile of the third blade section is y=3×10 -5 x 3 -0.009x-1.993x+24.47; in: x and y are the horizontal and vertical coordinates in the Oxyz coordinate system respectively; z is the vertical coordinate in the Oxyz coordinate system; In the Oxyz coordinate system, the rotation center of the gas turbine where the blade is located is taken as the horizontal coordinate x, the height direction of the blade passing through the center of gravity of the blade is taken as the vertical coordinate z, the intersection of the horizontal coordinate x and the vertical coordinate z is taken as the coordinate origin O, and the direction passing through the coordinate origin O and perpendicular to the Oxz plane is taken as the vertical coordinate y.

2. The two-stage gas turbine according to claim 1, characterized in that: The number of blades of the first-stage stationary blades (401) is 28, and the number of blades of the second-stage stationary blades (402) is 34.

3. The two-stage gas turbine according to claim 1, characterized in that: The number of blades of the first-stage moving blade (501) is 23, and the number of blades of the second-stage moving blade (502) is 23.

4. A stationary blade for a two-stage gas turbine, characterized in that: The stationary blade includes three blade profile sections, namely a first blade profile section, a second blade profile section and a third blade profile section, each of which includes a pressure surface blade profile line and a suction surface blade profile line; The section height of the first blade section of the stationary blade is 532 mm, and the pressure surface blade line of the first blade section is y=-4×10 -5 x 3 -0.004x 2 -0.677x-9.123, the suction surface profile of the first blade section is y=-1×10 -5 x 3 -0.012x 2 -0.765x+22.63; The section height of the second blade section of the stationary blade is 654 mm, and the pressure surface blade line of the second blade section is y=-3×10 -5 x 3 -0.003x 2 -0.659x-10.99, the suction surface profile of the second blade section is y=-8×10 -6 x 3 -0.010x 2 -0.731x+27.75; The section height of the third blade section of the stationary blade is 837 mm, and the pressure surface blade line of the third blade section is y=-2×10 -5 x 3 -0.002x 2 -0.659x-15.21, the suction surface profile line of the third blade section is y=-8×10 -6 x 3 -0.008x 2 -0.682x+35.

98.

5. A stationary blade for a two-stage gas turbine, characterized in that: The stationary blade includes three blade profile sections, namely a first blade profile section, a second blade profile section and a third blade profile section, each of which includes a pressure surface blade profile line and a suction surface blade profile line; The section height of the first blade section of the stationary blade is 534 mm, and the pressure surface blade line of the first blade section is y=-9×10 -5 x 3 -0.009x 2 -0.712x-6.257, the suction surface profile of the first blade section is y=-9×10 -5 x 3 -0.018x 2 -0.691x+21.04; The section height of the second blade section of the stationary blade is 676 mm, and the pressure surface blade line of the second blade section is y=-5×10 -5 x 3 -0.007x 2 -0.631x-6.790, the suction surface profile of the second blade section is y=-6×10 -5 x 3 -0.013x 2 -0.596x+26.7; The section height of the third blade section of the stationary blade is 889 mm; the pressure surface blade line of the third blade section is y=-3×10 -5 x 3 -0.004x 2 -0.772x-14.95, the suction surface profile line of the third blade section is y=-5×10 -5 x 3 -0.011x 2 -0.684x+36.

02.

6. A moving blade for a two-stage gas turbine, characterized in that: The moving blade includes three blade profile sections, namely a first blade profile section, a second blade profile section and a third blade profile section, each of which includes a pressure surface blade profile line and a suction surface blade profile line; The section height of the first blade section of the moving blade is 560 mm, and the pressure surface blade line of the first blade section is y=-4×10 -6 x 3 -0.002x 2 -0.150x-14.96, the suction surface profile line of the first blade section is y=-8×10 -6 x 3 -0.004x 2 -0.102x+47.74; The section height of the second blade section of the moving blade is 664 mm, and the pressure surface blade line of the second blade section is y=-4×10 -6 x 3 -0.003x 2 -0.638x-10.33, the suction surface profile of the second blade section is y=-1×10 -5 x 3 -0.007x 2 -0.592x+41.57; The section height of the third blade section of the moving blade is 872 mm, and the pressure surface blade line of the third blade section is y=3×10 -5 x 3 -0.004x 2 -1.837x-5.573, the suction surface profile of the third blade section is y=5×10 -5 x 3 -0.009x 2 -1.899x+26.

10.

7. A moving blade for a two-stage gas turbine, characterized in that: The moving blade includes three blade profile sections, namely a first blade profile section, a second blade profile section and a third blade profile section, each of which includes a pressure surface blade profile line and a suction surface blade profile line; The section height of the first blade section of the moving blade is 560 mm, and the pressure surface blade line of the first blade section is y=-5×10 -6 x 3 -0.002x 2 -0.118x-18.42, the suction surface profile of the first blade section is y=-1×10 -5 x 3 -0.004x 2 -0.070x+49.15; The section height of the second blade section of the moving blade is 740 mm, and the pressure surface blade line of the second blade section is y=6×10 -6 x 3 -0.004x 2 -1.100x-12.87, the suction surface profile line of the second blade section is y=-5×10 -6 x 3 -0.010x 2 -1.042x+39.20; The section height of the third blade section of the moving blade is 920 mm, and the pressure surface blade line of the third blade section is y=3×10 -5 x 3 -0.003x 2 -1.994x-8.547, the suction surface profile of the third blade section is y=3×10 -5 x 3 -0.009x-1.993x+24.47.

Images