Sliding pin system of 100 MW photothermal steam turbine

Abstract

A sliding pin system of a 100 MW photothermal steam turbine, relating to the fields of electric power, etc. The present invention aims to solve the problem of rotor-stator rub impact caused by the lifting of medium-pressure cylinders during the expansion of sliding pin systems in existing integrated wind-photovoltaic power stations. In the present invention, a steam turbine high-pressure cylinder (1) is connected to a front bearing box (3) by means of a front bearing box vertical key (5), and is connected to a middle bearing box (4) by means of a high-pressure cylinder centering beam (6); when a unit is in a hot state, the steam turbine high-pressure cylinder (1) expands in the direction towards the front bearing box (3) with the middle bearing box (4) as a dead point; a medium-low-pressure cylinder (2) is connected to the middle bearing box (4) by means of a middle box claw transverse key (9) and a middle box vertical key (7), and expands towards a steam discharge side with the middle box claw transverse key (9) as a dead point. During the rapid start process of the unit, the expansion is smooth, and the sliding pin system is not stuck, thus satisfying the cold start time of photothermal steam turbines. The present invention is used in steam turbines.

Description

A 100MW photo-thermal turbine sliding pin system TECHNICAL FIELD

[0001] The present application relates to a sliding pin system, in particular to a 100MW photo-thermal turbine sliding pin system, which is used in the fields of electric power, ships, chemical industry, petroleum, metallurgy and the like. BACKGROUND

[0002] Photo-thermal power generation refers to collecting solar heat energy by using large-scale array parabolic or dish-shaped mirror surfaces, providing steam through heat exchange devices, combining with the process of traditional steam turbine generators, so as to achieve the purpose of power generation. Compared with photovoltaic and wind power technologies, the biggest advantage of photo-thermal power generation is relatively stable and continuous power output. In the specific photo-thermal-electric mode, the heat energy has good storage performance, which makes the power output stable and is conducive to grid connection.

[0003] At present, the basic types of photo-thermal power generation are trough technology, tower technology, Fresnel type and butterfly type, among which the trough type and the tower type are the mainstream of photo-thermal power generation. The photo-thermal turbine is different from the traditional thermal power turbine in many aspects due to the instability of its energy source, and the requirements for design and process manufacturing capability are also much higher than those of the traditional turbine.

[0004] Most photo-thermal power stations cannot realize 24-hour continuous power generation. For conventional photo-thermal power stations, the steam turbine generally starts to operate in the morning and stops at night when there is no heat source or operates at low load through other fuel combustion. Therefore, the photo-thermal turbine needs to meet the requirement of frequent start at least once a day and shorten the time of each start as much as possible. From the economic point of view, the faster the start, the faster the rated power can be reached within a limited number of power generation hours, and more power can be generated, which is a key factor to maximize the income of the power station.

[0005] However, the faster the start, the greater the temperature difference between the internal and external parts of the turbine, and the mechanical stress caused thereby also increases. In addition, all photo-thermal power stations will be affected by unstable light resources, especially for photo-thermal power stations without heat storage, the instantaneous change of solar radiation intensity directly affects the parameters of the steam, and the turbine needs to adapt to the frequent changes of the working medium parameters.

[0006] In a new batch of wind-solar hybrid power stations, the solar photo-thermal turbine mainly plays the role of peak shaving and energy storage, and requires the turbine to have the functions of rapid start and stop and frequent start and stop. The photo-thermal turbine adopts axial exhaust arrangement, and for the traditional axial exhaust turbine, the sliding pin system has the problem of lifting the medium pressure cylinder during expansion, which restricts the start speed and flexibility of the turbine.

[0007] In summary, the sliding pin system of the solar thermal turbine in existing wind-solar integrated power plants has a problem of intermediate pressure cylinder lifting during expansion, leading to dynamic and static rubbing. Summary of the Invention

[0008] The purpose of this invention is to solve the problem of intermediate-pressure cylinder lifting during the expansion process of the sliding pin system of a solar thermal turbine in existing wind-solar integrated power plants, leading to dynamic and static rubbing. Therefore, this invention provides a sliding pin system for a 100MW solar thermal turbine.

[0009] The technical solution of this invention is as follows: A 100MW solar thermal turbine sliding pin system includes a high-pressure cylinder, an intermediate and low-pressure cylinder, a front bearing housing, and an intermediate bearing housing. The high-pressure cylinder rests on one end of the front and intermediate bearing housings via front and rear claw-shaped supports, while the intermediate and low-pressure cylinder rests on the other end of the intermediate bearing housing. It also includes a front bearing housing key, a high-pressure cylinder centering beam, an intermediate housing key, an exhaust cylinder flexible plate, and an intermediate housing claw-shaped cross key. The high-pressure cylinder is connected to the front bearing housing via the front bearing housing key, and the high-pressure cylinder is connected to the intermediate bearing housing via the high-pressure cylinder centering beam. When the unit is hot, the high-pressure cylinder expands towards the front bearing housing with the intermediate bearing housing as its dead point. The intermediate and low-pressure cylinders are connected to the intermediate bearing housing via the intermediate housing claw-shaped cross key and the intermediate housing key, with the intermediate and low-pressure cylinders expanding towards the exhaust side with the intermediate housing claw-shaped cross key as their dead point. The exhaust cylinder flexible plate is mounted on the support skirt of the intermediate and low-pressure cylinders.

[0010] Furthermore, the front bearing housing key includes a first key, a first adjusting shim, and a first fastening screw. The first key is integrally machined on the front bearing housing, and the first adjusting shims are symmetrically connected on the left and right sides of the high-pressure cylinder of the steam turbine. The two first adjusting shims are connected to the first key by a first fastening screw.

[0011] Furthermore, the high-pressure cylinder centering beam includes a centering beam and a first connecting bolt. The two ends of the centering beam are connected to the intermediate bearing housing and the high-pressure outer cylinder of the turbine high-pressure cylinder through the first connecting bolt.

[0012] Preferably, the longitudinal section shape of the center beam is a horizontally placed "I" shape.

[0013] Furthermore, the centering beam of the high-pressure cylinder also includes a second adjusting shim, which is installed between the centering beam and the high-pressure outer cylinder.

[0014] Furthermore, the middle box key includes a second key, a combination key, a third adjusting shim, and a second connecting bolt. The second key is integrally machined on the middle bearing housing, and the combination key is machined on the medium and low pressure cylinder. The second key and the combination key are connected by the third adjusting shim and the second connecting bolt.

[0015] Furthermore, the middle key also includes a pin, which is simultaneously inserted into the second key and the combination key.

[0016] Further, the exhaust cylinder flexible plate comprises a flexible plate horizontal key, an exhaust cylinder support plate, a flexible plate and a third connecting bolt, the flexible plate is vertically installed on the middle-low pressure cylinder, the exhaust cylinder support plate is connected with the flexible plate through the third connecting bolt, and the exhaust cylinder support plate is connected with the beam of the flexible plate through the flexible plate horizontal key.

[0017] Further, the middle box cat claw horizontal key comprises a fourth adjusting washer, a sleeve, a cat claw horizontal key, a fourth connecting bolt and a nut, the cat claw horizontal key is installed on the middle-low pressure cylinder and the middle bearing box, the sleeve is sleeved on the middle-low pressure cylinder at the upper end of the cat claw horizontal key, the fourth connecting bolt is vertically inserted into the fourth adjusting washer, the sleeve and the cat claw horizontal key located on the middle-low pressure cylinder and is screwed into the middle bearing box, and the nut is screwed on the upper part of the fourth connecting bolt.

[0018] Further, the middle box cat claw horizontal key further comprises a stop screw, and the stop screw is horizontally inserted into the fourth connecting bolt and the nut.

[0019] Compared with the prior art, the present application has the following effects:

[0020] The present application sets the front bearing box vertical key 5, the high pressure cylinder centering beam 6, the middle box vertical key 7, the exhaust cylinder flexible plate 8 and the middle box cat claw horizontal key 9 between the high pressure cylinder 1, the middle-low pressure cylinder 2, the front bearing box 3 and the middle bearing box 4, so that, during the operation of the wind-solar combined power station steam turbine, the high pressure cylinder 1 of the steam turbine expands to the direction of the front bearing box 3 with the middle bearing box 4 as the dead point, and the middle-low pressure cylinder 2 expands to the exhaust side with the middle box cat claw horizontal key 9 as the dead point. This expansion mode makes the unit expand smoothly during the rapid start process, and the front bearing box vertical key 5, the high pressure cylinder centering beam 6, the middle box vertical key 7, the exhaust cylinder flexible plate 8 and the middle box cat claw horizontal key 9 do not jam, solves the problem of lifting of the middle pressure cylinder caused by poor expansion of the traditional axial exhaust steam turbine, and meets the requirement of 90min cold start time of the solar-thermal steam turbine. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 is a schematic diagram of the whole machine of the present application;

[0022] Fig. 2 is a schematic diagram of the front box vertical key;

[0023] Fig. 3 is a schematic diagram of the front box centering beam;

[0024] Fig. 4 is a schematic diagram of the middle box vertical key;

[0025] Fig. 5 is a schematic diagram of the exhaust cylinder flexible support;

[0026] Fig. 6 is a schematic diagram of the cat claw horizontal key. DETAILED DESCRIPTION

[0027] Specific implementation mode one: the specific implementation mode one is described in combination with FIG. 1 to FIG. 6, and the specific implementation mode one comprises a steam turbine high-pressure cylinder 1, a middle-low-pressure cylinder 2, a front bearing box 3 and a middle bearing box 4, the steam turbine high-pressure cylinder 1 is clamped on one end of the front bearing box 3 and the middle bearing box 4 through front and rear claws, and the middle-low-pressure cylinder 2 is clamped on the other end of the middle bearing box 4; the specific implementation mode one further comprises a front bearing box vertical key 5, a high-pressure cylinder centering beam 6, a middle box vertical key 7, an exhaust cylinder flexible plate 8 and a middle box claw cross key 9, the steam turbine high-pressure cylinder 1 is connected with the front bearing box 3 through the front bearing box vertical key 5, and the steam turbine high-pressure cylinder 1 and the middle bearing box 4 are connected through the high-pressure cylinder centering beam 6, wherein, when the unit is in a hot state, the steam turbine high-pressure cylinder 1 expands towards the front bearing box 3 with the middle bearing box 4 as a dead point; the middle-low-pressure cylinder 2 and the middle bearing box 4 are connected through the middle box claw cross key 9 and the middle box vertical key 7, wherein, the middle-low-pressure cylinder 2 expands towards the exhaust side with the middle box claw cross key 9 as a dead point; and the exhaust cylinder flexible plate 8 is installed on a support skirt plate of the middle-low-pressure cylinder 2.

[0028] The specific implementation mode one further comprises a longitudinal anchoring plate 31, a lower half of the longitudinal anchoring plate 31 is embedded in a steam turbine foundation, and an upper half of the longitudinal anchoring plate 31 is connected with the middle-low-pressure cylinder 2 to ensure that the middle-low-pressure cylinder keeps a center unchanged relative to the foundation.

[0029] The steam turbine sliding pin system is novel, the rotor and the cylinder both expand towards two sides with the middle bearing box 4 as a dead point, the relative expansion difference between the rotor and the cylinder is small, the dynamic and static clearance is easier to control in a starting process, and the starting speed is faster.

[0030] Specific implementation mode two: the specific implementation mode two is described in combination with FIG. 1 and FIG. 2, and the front bearing box vertical key 5 of the specific implementation mode two comprises a first vertical key 12, a first adjusting gasket 11 and a first fastening screw 10, the first vertical key 12 is integrally machined on the front bearing box 3, the first adjusting gasket 11 is symmetrically connected on the steam turbine high-pressure cylinder 1, and the two first adjusting gaskets 11 are connected with the first vertical key 12 through a first fastening screw 10 respectively.

[0031] In this way, the first adjusting gasket 11 in the front bearing box vertical key 5 is connected with the steam turbine high-pressure cylinder 1 through the first fastening screw 10, and the gap between the first adjusting gasket 11 and the first vertical key 12 is aligned to ensure that the first vertical key 12 can freely expand between the adjusting gaskets 11 and can always be centered to ensure that dynamic and static friction does not occur. Other components and connection relationships are the same as those of the specific implementation mode one.

[0032] Specific implementation mode three: the specific implementation mode three is described in combination with FIG. 1 and FIG. 3, and the high-pressure cylinder centering beam 6 of the specific implementation mode three comprises a centering beam 15 and a first connecting screw 13, and the two ends of the centering beam 15 are connected with the middle bearing box 4 and a high-pressure outer cylinder of the steam turbine high-pressure cylinder 1 through the first connecting screw 13.

[0033] In this way, the connection between the middle bearing box 4 and the high-pressure cylinder 1 of the steam turbine is facilitated. The other components and connection relationships are the same as those in the second embodiment.

[0034] In the fourth embodiment, the longitudinal section of the centering beam 15 is horizontally arranged in the shape of an "H".

[0035] In this way, the connection is more secure. The other components and connection relationships are the same as those in the third embodiment.

[0036] In the fifth embodiment, the high-pressure cylinder centering beam 6 further comprises a second adjusting gasket 14, and the second adjusting gasket 14 is arranged between the centering beam 15 and the high-pressure outer cylinder.

[0037] In this way, the length of the centering beam 15 is adjusted by the thickness of the second adjusting gasket 14 during installation, so that the length of the centering beam 15 is suitable for the position of the cylinder and the bearing box. The other components and connection relationships are the same as those in any one of the first to fourth embodiments.

[0038] In the sixth embodiment, the middle box vertical key 7 comprises a second vertical key 20, a combined key 19, a third adjusting gasket 16, and a second connecting bolt 17. The second vertical key 20 is integrally machined on the middle bearing box 4, the combined key 19 is machined on the middle and low-pressure cylinder 2, and the second vertical key 20 and the combined key 19 are connected by the third adjusting gasket 16 and the second connecting bolt 17. In this way, the gap between the third adjusting gasket 16 and the vertical key 20 is adjusted to ensure that the vertical key 20 can freely expand between the third adjusting gasket 16 and always be centered to prevent dynamic and static friction. The other components and connection relationships are the same as those in any one of the first to fifth embodiments.

[0039] In the seventh embodiment, the middle box vertical key 7 further comprises a latch 18, which is simultaneously inserted into the second vertical key 20 and the combined key 19.

[0040] In this way, the positioning of the second vertical key 20 and the combined key 19 is facilitated. The other components and connection relationships are the same as those in any one of the first to sixth embodiments.

[0041] In the eighth embodiment, the exhaust cylinder flexible plate 8 comprises a flexible plate horizontal key 21, an exhaust cylinder support plate 30, a flexible plate 23, and a third connecting bolt 22. The flexible plate 23 is vertically installed on the middle and low-pressure cylinder 2, the exhaust cylinder support plate 30 is connected to the flexible plate 23 by the third connecting bolt 22, and the exhaust cylinder support plate 30 is connected to the balance beam of the flexible plate 23 by the flexible plate horizontal key 21.

[0042] In this way, the flexible plate 23 and the exhaust cylinder support plate 30 in the exhaust cylinder flexible plate 8 are connected by the flexible plate cross key 21 to ensure that the axial positions are consistent, and the flexible plate 23 and the exhaust cylinder support plate 30 are locked by the third connecting bolt 22 to prevent loosening during operation. The other components and connection relationships are the same as any one of embodiments 1 to 7.

[0043] In this embodiment, the middle box cat claw cross key 9 includes a fourth adjusting washer 26, a sleeve 25, a cat claw cross key 29, a fourth connecting bolt 24, and a nut 27. The cat claw cross key 29 is installed on the middle-low pressure cylinder 2 and the middle bearing box 4. The sleeve 25 is sleeved on the middle-low pressure cylinder 2 at the upper end of the cat claw cross key 29. The fourth connecting bolt 24 is vertically inserted into the fourth adjusting washer 26, the sleeve 25, and the cat claw cross key 29 located on the middle-low pressure cylinder 2 and is screwed into the middle bearing box 4. The nut 27 is screwed on the upper part of the fourth connecting bolt 24.

[0044] In this way, the middle-low pressure cylinder 2 can expand axially to the exhaust side with the cross key 29 as the dead point, and there is an expansion gap between the middle-low pressure cylinder and the adjusting washer 26. The middle-low pressure cylinder 2 will not loosen or be damaged after being heated. The other components and connection relationships are the same as any one of embodiments 1 to 8.

[0045] In this embodiment, the middle box cat claw cross key 9 also includes a stop screw 28, which is horizontally inserted into the fourth connecting bolt 24 and the nut 27. In this way, the fourth connecting bolt 24 and the nut 27 are fixed by the stop screw 28, and the connecting bolt 24 and the nut 27 will not loosen at the threaded connection due to the vibration of the unit. The other components and connection relationships are the same as any one of embodiments 1 to 9.

[0046] The working principle of the present application is explained in combination with FIGS. 1 to 6:

[0047] In this embodiment, the present application ensures that the steam turbine high pressure cylinder 1 expands to the front bearing box 3 with the middle bearing box 4 as the dead point during operation. The centering beam 15 ensures that the steam turbine high pressure cylinder 1 and the middle bearing box 4 are centered and absorb the difference in thermal expansion in the horizontal direction. The front box vertical key 5 ensures that the steam turbine high pressure cylinder 1 and the front bearing box 3 are centered, and the steam turbine high pressure cylinder 1 can slide freely in the axial and horizontal directions relative to the front bearing box 3.

[0048] The middle-low pressure cylinder 2 expands to the exhaust side with the cat claw horizontal key 9 as the dead point. The middle cylinder vertical key 7 ensures that the middle-low pressure cylinder 2 and the middle bearing box 4 are centered, and at the same time, the middle-low pressure cylinder 2 can freely expand in the axial and vertical directions. The exhaust cylinder flexible plate 8 deforms axially to absorb the axial expansion of the middle-low pressure cylinder, and the longitudinal anchoring plate 31 ensures that the middle-low pressure cylinder remains centered relative to the foundation.

[0049] The present embodiment is described in combination with Fig. 2. By adjusting the gap between the gasket 11 and the high pressure cylinder 1 of the steam turbine, the integrated structure of the gasket 11 and the front bearing box 3 ensures that the high pressure cylinder 1 of the steam turbine and the front bearing box 3 are centered and can freely slide relative to each other.

[0050] The present embodiment is described in combination with Fig. 3. The centering beam 6 ensures that the high pressure cylinder 1 of the steam turbine and the middle bearing box 4 are centered, and when the high pressure cylinder 1 of the steam turbine and the middle bearing box 4 have a height deviation after thermal expansion, the centering beam 6 deforms flexibly to absorb the thermal expansion difference in the vertical direction between the high pressure cylinder 1 of the steam turbine and the middle bearing box 4.

[0051] The present embodiment is described in combination with Fig. 4. By adjusting the gap between the third adjusting gasket 16 and the middle bearing box 4, the third adjusting gasket 16 and the middle bearing box 4 are centered and can freely slide relative to each other. During installation, in order to ensure stable support of the middle-low pressure cylinder, the installation pin 18 is inserted after the middle-low pressure cylinder 2 and the middle bearing box 4 are aligned. The installation pin 18 is removed after the unit is installed and before operation.

[0052] The present embodiment is described in combination with Fig. 5. During operation of the steam turbine, the flexible plate 23 deforms flexibly, and the vertical plate is inclined by less than 1°, ensuring sufficient support stiffness and absorbing the expansion of the middle-low pressure cylinder 2 in the axial direction.

[0053] The present embodiment is described in combination with Fig. 6. The cat claw horizontal key 29 is used to transmit the thrust between the middle-low pressure cylinder 2 and the middle bearing box 4. At the same time, the middle-low pressure cylinder 2 and the cat claw horizontal key 29 can freely expand in the horizontal direction. By adjusting the gap between the gasket 26 and the middle-low pressure cylinder 2, the horizontal expansion of the middle-low pressure cylinder 2 and the cat claw horizontal key 29 is smooth.

[0054] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A 100MW photo-thermal turbine sliding pin system, comprising a high-pressure cylinder (1), a middle-low pressure cylinder (2), a front bearing box (3) and a middle bearing box (4), the high-pressure cylinder (1) is supported on one end of the front bearing box (3) and the middle bearing box (4) by front and rear claws, and the middle-low pressure cylinder (2) is supported on the other end of the middle bearing box (4); characterized in that it also comprises a front bearing box vertical key (5), a high-pressure cylinder centering beam (6), a middle box vertical key (7), an exhaust cylinder flexible plate (8) and a middle box claw cross key (9), the high-pressure cylinder (1) is connected with the front bearing box (3) through the front bearing box vertical key (5), and the high-pressure cylinder (1) is connected with the middle bearing box (4) through the high-pressure cylinder centering beam (6), wherein, when the unit is in a hot state, the high-pressure cylinder (1) expands towards the front bearing box (3) with the middle bearing box (4) as a dead point; the middle-low pressure cylinder (2) is connected with the middle bearing box (4) through the middle box claw cross key (9) and the middle box vertical key (7), wherein the middle-low pressure cylinder (2) expands towards the exhaust side with the middle box claw cross key (9) as a dead point; the exhaust cylinder flexible plate (8) is installed on the support skirt plate of the middle-low pressure cylinder (2).

2. A 100 MW solar thermal steam turbine sliding key system according to claim 1, characterized in that: The front bearing box vertical key (5) comprises a first vertical key (12), a first adjusting gasket (11) and a first fastening screw (10), the first vertical key (12) is integrally machined on the front bearing box (3), the first adjusting gasket (11) is symmetrically connected on the high-pressure cylinder (1), and the two first adjusting gaskets (11) are connected with the first vertical key (12) through a first fastening screw (10) respectively.

3. A 100 MW solar thermal steam turbine sliding key system according to claim 2, characterized in that: The high-pressure cylinder centering beam (6) comprises a centering beam (15) and a first connecting bolt (13), and the two ends of the centering beam (15) are connected with the middle bearing box (4) and the high-pressure outer cylinder of the high-pressure cylinder (1) through the first connecting bolt (13).

4. A 100 MW solar thermal steam turbine sliding key system according to claim 3, characterized in that: The longitudinal section shape of the centering beam (15) is a horizontally placed "I" shape.

5. A 100 MW solar thermal steam turbine sliding key system according to claim 4, characterized in that: The high-pressure cylinder centering beam (6) further comprises a second adjusting gasket (14), and the second adjusting gasket (14) is installed between the centering beam (15) and the high-pressure outer cylinder.

6. A 100 MW solar thermal steam turbine sliding key system according to claim 5, characterized in that: The middle box vertical key (7) comprises a second vertical key (20), a combined key (19), a third adjusting gasket (16) and a second connecting bolt (17), the second vertical key (20) is integrally machined on the middle bearing box (4), the combined key (19) is machined on the middle-low pressure cylinder (2), and the second vertical key (20) and the combined key (19) are connected through the third adjusting gasket (16) and the second connecting bolt (17).

7. A 100 MW solar thermal steam turbine sliding key system according to claim 6, characterized in that: The middle box vertical key (7) further comprises a latch (18), and the latch (18) is simultaneously installed on the second vertical key (20) and the combined key (19).

8. A 100 MW solar thermal steam turbine sliding key system according to claim 7, characterized in that: The exhaust cylinder flexible plate (8) comprises a flexible plate cross key (21), an exhaust cylinder support plate (30), a flexible plate (23) and a third connecting bolt (22), the flexible plate (23) is vertically installed on the middle-low pressure cylinder (2), the exhaust cylinder support plate (30) is connected with the flexible plate (23) through the third connecting bolt (22), and the exhaust cylinder support plate (30) is connected with the beam of the flexible plate (23) through the flexible plate cross key (21).

9. A 100 MW solar thermal steam turbine sliding key system according to claim 8, characterized in that: The middle box cat claw horizontal key (9) comprises a fourth adjusting washer (26), a sleeve (25), a cat claw horizontal key (29), a fourth connecting bolt (24) and a nut (27), the cat claw horizontal key (29) is installed on the middle-low pressure cylinder (2) and the middle bearing box (4), the sleeve (25) is sleeved in the middle-low pressure cylinder (2) at the upper end of the cat claw horizontal key (29), the fourth connecting bolt (24) is vertically inserted into the fourth adjusting washer (26), the sleeve (25) and the cat claw horizontal key (29) located on the middle-low pressure cylinder (2) and is screwed into the middle bearing box (4) at the back, and the nut (27) is screwed on the upper part of the fourth connecting bolt (24).

10. A 100 MW solar thermal steam turbine sliding key system according to claim 9, characterized in that: The middle box cat claw horizontal key (9) further comprises a stop screw (28), the stop screw (28) is horizontally inserted into the fourth connecting bolt (24) and the nut (27).

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