阅读说明：本技术 一种具备高背压供热功能的30mw汽轮机 (30MW steam turbine that possesses high back pressure heat supply function ) 是由 赫广迅 张启林 刘丽 黄智敏 张金春 关淳 刘娇 崔庆泽 于 2021-09-23 设计创作，主要内容包括：一种具备高背压供热功能的30MW汽轮机,它涉及生物质发电及汽轮机技术领域。本发明解决了现有30MW等级原型汽轮机存在冲动式叶型效率低,缸效率低,功能匹配不全,因蒸汽参数低总体性能差,不能满足生物质发电对高参数高转速多功能汽轮机的使用要求的问题。本发明的汽轮机转子两端分别与前支持组件和后支持组件转动连接,高低压合缸套设在汽轮机转子上,高压主汽管道设置在高低压合缸外部,高压主汽管道一端安装有高压主汽阀,高压主汽管道另一端沿长度方向安装有若干个高压调节阀,气缸前部上设有喷嘴组,高压进汽导气管一端与高压调节阀连接,高压进汽导气管另一端与喷嘴组连接。本发明用于用于提高缸效率及循环效率。(A30 MW steam turbine with a high back pressure heat supply function relates to the technical field of biomass power generation and steam turbines. The invention solves the problems that the existing 30MW grade prototype steam turbine has low impulse type blade profile efficiency, low cylinder efficiency and incomplete function matching, and the use requirement of biomass power generation on a high-parameter high-rotating-speed multifunctional steam turbine can not be met due to low steam parameter and poor overall performance. The two ends of a steam turbine rotor are respectively rotatably connected with a front supporting assembly and a rear supporting assembly, a high-pressure and low-pressure combination cylinder sleeve is arranged on the steam turbine rotor, a high-pressure main steam pipeline is arranged outside the high-pressure and low-pressure combination cylinder, a high-pressure main steam valve is arranged at one end of the high-pressure main steam pipeline, a plurality of high-pressure regulating valves are arranged at the other end of the high-pressure main steam pipeline along the length direction, a nozzle group is arranged on the front portion of a cylinder, one end of a high-pressure steam inlet air guide pipe is connected with the high-pressure regulating valve, and the other end of the high-pressure steam inlet air guide pipe is connected with the nozzle group. The invention is used for improving the cylinder efficiency and the cycle efficiency.)

1. The utility model provides a 30MW steam turbine that possesses high back pressure heat supply function which characterized in that: the high-low pressure steam turbine comprises a front supporting assembly, a rear supporting assembly, a high-low pressure cylinder module and a high-pressure main steam adjusting combined valve, wherein the high-low pressure cylinder module comprises a high-low pressure pressing cylinder, a high-pressure front steam seal (4), a high-pressure air inlet side balance ring (5), a low-pressure last stage clapboard (15), a low-pressure rear steam seal (16), a steam turbine rotor (17), a nozzle group (28), a clapboard sleeve group, two base frames (30), a plurality of static blades (29) and a plurality of moving blades (36), the steam turbine rotor (17) is horizontally arranged, one end of the steam turbine rotor (17) is rotatably connected with the front supporting assembly, the other end of the steam turbine rotor (17) is rotatably connected with the rear supporting assembly, the front supporting assembly and the rear supporting assembly are respectively arranged at the upper parts of the two base frames (30), the base frames (30) are arranged on the horizontal ground, and the high-low pressure pressing cylinder is positioned between the front supporting assembly and the rear supporting assembly, the high-pressure and low-pressure combined cylinder is sleeved on a steam turbine rotor (17), the high-pressure and low-pressure combined cylinder comprises a cylinder front part (1), a cylinder middle part (2) and a steam exhaust cylinder (3), the cylinder front part (1), the cylinder middle part (2) and the steam exhaust cylinder (3) are sequentially and coaxially connected from a high pressure side to a low pressure side along the length direction of the steam turbine rotor (17), the center of the front end of the cylinder front part (1) is horizontally provided with an assembly hole a along the axis direction, a high-pressure front steam seal (4) is installed on the inner circle of the assembly hole a, the high-pressure front steam seal (4) is sleeved on the steam turbine rotor (17), the center of the rear end of the steam exhaust cylinder (3) is horizontally provided with an assembly hole b along the axis direction, a low-pressure rear steam seal (16) is installed on the inner circle of the assembly hole b, the low-pressure rear steam seal (16) is sleeved on the steam turbine rotor (17), a high-pressure air inlet side balance ring (5), a partition sleeve and a low-pressure partition (15) are sequentially arranged inside the high-pressure combined cylinder from front to rear, the high-pressure main steam adjusting combined valve comprises a high-pressure main steam pipeline (32), a high-pressure main steam valve (33), a plurality of moving blades (36), a plurality of high-pressure adjusting valves (34) and a plurality of high-pressure steam inlet air guide pipes (35), wherein the high-pressure main steam pipeline (32) is arranged outside the high-low pressure combined cylinder, one end of the high-pressure main steam pipeline (32) is provided with the high-pressure main steam valve (33), the other end of the high-pressure main steam pipeline (32) is provided with a plurality of high-pressure regulating valves (34) along the length direction, the front part (1) of the cylinder is provided with a nozzle group (28), one end of a high-pressure steam inlet air duct (35) is connected with the high-pressure regulating valves (34), and the other end of the high-pressure steam inlet air duct (35) is connected with the nozzle group (28).

2. The 30MW steam turbine with high back pressure heating according to claim 1, wherein: the baffle suit includes first baffle cover (6), second baffle cover (7), third baffle cover (8), fourth baffle cover (9), fifth baffle cover (10), sixth baffle cover (11), seventh baffle cover (12), eighth baffle cover (13) and ninth baffle cover (14), first baffle cover (6), second baffle cover (7), third baffle cover (8), fourth baffle cover (9), fifth baffle cover (10) and sixth baffle cover (11) are installed on cylinder front portion (1) inner wall by preceding to back in proper order, seventh baffle cover (12), eighth baffle cover (13) and ninth baffle cover (14) are installed on cylinder middle part (2) inner wall by preceding to back in proper order.

3. The 30MW steam turbine with high back pressure heating according to claim 2, wherein: the front support assembly comprises a front bearing box (18), a thrust support bearing (19), a front bearing box oil retainer ring (20) and a centering beam (21), wherein an assembly hole c is horizontally formed in the center of the rear end of the front bearing box (18) along the axis direction, the front bearing box oil retainer ring (20) is installed on the inner wall of the assembly hole c, the front bearing box oil retainer ring (20) is sleeved on a steam turbine rotor (17), one end of the steam turbine rotor (17) penetrates through the front bearing box oil retainer ring (20) and is rotatably connected with the front bearing box (18) through the thrust support bearing (19), and the centering beam (21) is installed on the rear end face of the front bearing box (18).

4. The 30MW steam turbine with high back pressure heating capability of claim 3, wherein: the rear supporting assembly comprises a rear bearing box (22), a rear supporting bearing (23), a rear bearing box oil retainer ring a (24) and a rear bearing box oil retainer ring b (25), an assembly hole e is formed in the center of the rear end face of the rear bearing box (22) along the horizontal direction of the axis, the inner wall of the assembly hole e is provided with the rear bearing box oil retainer ring b (25), an assembly hole d is formed in the center of the front end face of the rear bearing box (22) along the horizontal direction of the axis, the inner wall of the assembly hole d is provided with the rear bearing box oil retainer ring a (24), the rear bearing box oil retainer ring a (24) is sleeved on the steam turbine rotor (17), and the other end of the steam turbine rotor (17) penetrates through the rear bearing box oil retainer ring a (24) and is rotatably connected with the rear bearing box (22) through the rear supporting bearing (23).

5. The 30MW steam turbine with high back pressure heating function as claimed in claim 4, wherein: the exhaust device also comprises an atmosphere valve (26), a low-pressure air leakage hole is formed in the upper portion of the exhaust cylinder (3), and the atmosphere valve (26) is installed in the low-pressure exhaust hole.

6. The 30MW steam turbine with high back pressure heating function as claimed in claim 5, wherein: the turning gear further comprises a turning gear (27), and the turning gear (27) is installed on the rear bearing box (22).

7. The 30MW steam turbine with high back pressure heating capability of claim 6, wherein: the steam seal device further comprises a balance gas pipeline (31), one end of the balance gas pipeline (31) is communicated with the rear part of the high-pressure second section of the steam seal, and the other end of the balance gas pipeline (31) is communicated with the through flow 27 stage.

8. The 30MW steam turbine with high back pressure heating according to claim 7, wherein: the high-low pressure cylinder is of a single-cylinder structure.

9. The 30MW steam turbine with high back pressure heating according to claim 8, wherein: the high-pressure main steam regulating combined valve adopts a main and double regulating combined valve.

10. The 30MW steam turbine with high back pressure heating according to claim 9, wherein: the steam inlet parameter of the unit is 8.83MPa/535 ℃.

Technical Field

The invention relates to the technical field of biomass power generation and steam turbines, in particular to a 30MW steam turbine with a high back pressure heat supply function.

Background

The existing 30 MW-grade impulse steam turbine is popularized and applied in China in the last 70 th century, the designed steam parameter is low, the system efficiency is poor, the structural reliability is poor, meanwhile, the high back pressure heat supply capacity is not provided, and the engineering requirement of the biomass power generation field for high parameter and multiple functions cannot be met.

Disclosure of Invention

The invention aims to solve the problems that an existing 30 MW-grade prototype steam turbine is low in impulse type blade profile efficiency, low in cylinder efficiency and incomplete in function matching, and cannot meet the use requirements of biomass power generation on a high-parameter high-rotating-speed multifunctional steam turbine due to low steam parameters and poor overall performance, and further provides a 30MW steam turbine with a high back pressure heating function.

The technical scheme of the invention is as follows:

a30 MW steam turbine with high back pressure heat supply function comprises a front supporting component, a rear supporting component, a high-low pressure cylinder module and a high-pressure main steam adjusting combined valve, wherein the high-low pressure cylinder module comprises a high-low pressure combination cylinder, a high-pressure front steam seal 4, a high-pressure air inlet side balance ring 5, a low-pressure final stage clapboard 15, a low-pressure rear steam seal 16, a steam turbine rotor 17, a nozzle group 28, a clapboard sleeve group, two base frames 30, a plurality of static blades 29 and a plurality of moving blades 36, the steam turbine rotor 17 is horizontally arranged, one end of the steam turbine rotor 17 is rotationally connected with the front supporting component, the other end of the steam turbine rotor 17 is rotationally connected with the rear supporting component, the front supporting component and the rear supporting component are respectively arranged on the upper parts of the two base frames 30, the base frames 30 are arranged on the horizontal ground, the high-low pressure combination cylinder is positioned between the front supporting component and the rear supporting component, and the high-low pressure combination cylinder sleeve is arranged on the steam turbine rotor 17, the high-low pressure combination cylinder comprises a cylinder front part 1, a cylinder middle part 2 and an exhaust cylinder 3, wherein the cylinder front part 1, the cylinder middle part 2 and the exhaust cylinder 3 are sequentially and coaxially connected from a high-pressure side to a low-pressure side along the length direction of a steam turbine rotor 17, an assembly hole a is horizontally formed in the center of the front end of the cylinder front part 1 along the axis direction, a high-pressure front steam seal 4 is installed on the inner circle of the assembly hole a, the high-pressure front steam seal 4 is sleeved on the steam turbine rotor 17, an assembly hole b is horizontally formed in the center of the rear end of the exhaust cylinder 3 along the axis direction, a low-pressure rear steam seal 16 is installed on the inner circle of the assembly hole b, the low-pressure rear steam seal 16 is sleeved on the steam turbine rotor 17, a high-pressure air inlet side balance ring 5, a partition sleeve and a low-pressure partition 15 are sequentially arranged in the high-low pressure combination cylinder from front to back, the partition sleeve is installed on the inner wall of the high-low pressure combination cylinder, the high-pressure air inlet side balance ring 5 is installed on the inner wall of the cylinder front part 1 close to one side of the high-pressure front steam seal 4, the low-pressure final-stage clapboard 15 is arranged on the inner wall of the exhaust cylinder 3 at one side close to the low-pressure rear gland seal 16, a plurality of static blades 29 are arranged on the inner walls of the clapboard sleeve group and the low-pressure final-stage clapboard 15, a plurality of moving blades 36 are arranged on the outer wall of the steam turbine rotor 17, the plurality of stationary blades 29 and the plurality of moving blades 36 are arranged in a staggered manner, the high-pressure main steam adjusting combination valve comprises a high-pressure main steam pipeline 32, a high-pressure main steam valve 33, a plurality of high-pressure adjusting valves 34 and a plurality of high-pressure steam inlet air guide pipes 35, the high-pressure main steam pipeline 32 is arranged outside the high-low pressure combination cylinder, the high-pressure main steam valve 33 is installed at one end of the high-pressure main steam pipeline 32, the plurality of high-pressure adjusting valves 34 are installed at the other end of the high-pressure main steam pipeline 32 in the length direction, a nozzle group 28 is arranged on the front portion 1 of the cylinder, one end of each high-pressure steam inlet air guide pipe 35 is connected with the corresponding high-pressure adjusting valve 34, and the other end of each high-pressure steam inlet air guide pipe 35 is connected with the corresponding nozzle group 28.

Further, the baffle sleeve group includes first baffle cover 6, second baffle cover 7, third baffle cover 8, fourth baffle cover 9, fifth baffle cover 10, sixth baffle cover 11, seventh baffle cover 12, eighth baffle cover 13 and ninth baffle cover 14, first baffle cover 6, second baffle cover 7, third baffle cover 8, fourth baffle cover 9, fifth baffle cover 10 and sixth baffle cover 11 are installed on cylinder front portion 1 inner wall by preceding to back in proper order, seventh baffle cover 12, eighth baffle cover 13 and ninth baffle cover 14 are installed on cylinder middle portion 2 inner wall by preceding to back in proper order.

Further, the front support assembly comprises a front bearing box 18, a thrust support bearing 19, a front bearing box oil retainer ring 20 and a centering beam 21, an assembly hole c is horizontally formed in the center of the rear end of the front bearing box 18 along the axis direction, the front bearing box oil retainer ring 20 is installed on the inner wall of the assembly hole c, the front bearing box oil retainer ring 20 is sleeved on the steam turbine rotor 17, one end of the steam turbine rotor 17 penetrates through the front bearing box oil retainer ring 20 and is rotatably connected with the front bearing box 18 through the thrust support bearing 19, and the centering beam 21 is installed on the rear end face of the front bearing box 18.

Further, the rear support assembly comprises a rear bearing box 22, a rear support bearing 23, a rear bearing box oil retainer ring a24 and a rear bearing box oil retainer ring b25, an assembly hole e is horizontally formed in the center of the rear end face of the rear bearing box 22 along the axis direction, a rear bearing box oil retainer ring b25 is installed on the inner wall of the assembly hole e, an assembly hole d is horizontally formed in the center of the front end face of the rear bearing box 22 along the axis direction, a rear bearing box oil retainer ring a24 is installed on the inner wall of the assembly hole d, the rear bearing box oil retainer ring a24 is sleeved on the turbine rotor 17, and the other end of the turbine rotor 17 penetrates through the rear bearing box oil retainer ring a24 and is rotatably connected with the rear bearing box 22 through the rear support bearing 23.

Further, the exhaust device also comprises an atmosphere valve 26, a low-pressure air release hole is formed in the upper portion of the exhaust cylinder 3, and the atmosphere valve 26 is installed in the low-pressure exhaust hole.

Further, it comprises a barring gear 27, the barring gear 27 being mounted on the rear bearing housing 22.

Further, the device also comprises a balance gas pipeline 31, one end of the balance gas pipeline 31 is communicated with the rear part of the high-pressure second-section steam seal, and the other end of the balance gas pipeline 31 is communicated with the through flow 27 stage.

Further, the high-low pressure cylinder is of a single-cylinder structure.

Furthermore, the high-pressure main steam regulating combined valve adopts a main two-regulating combined valve.

Further, the steam inlet parameter of the unit is 8.83MPa/535 ℃.

Compared with the prior art, the invention has the following effects:

1. the 30MW steam turbine with the high back pressure heat supply function can meet the requirement of biomass power generation on a high-parameter steam turbine, and the steam turbine cylinder has the advantages of high efficiency, high cycle efficiency and low cost control, and can meet the requirement of high back pressure heat supply operation. Can effectively improve the market competitiveness.

2. The front bearing box 18 and the rear bearing box 22 of the 30MW steam turbine with the high back pressure heating function are directly grounded, the front part of the outer cylinder of the high-low pressure combination cylinder is supported by the horizontal split surface of the lower cat claw, the exhaust cylinder 3 is supported by the base frame 30, the dead point of the cylinder is the intersection point of the transverse pin of the base frame 30 of the exhaust cylinder 3 and the central line of the unit, the cylinder expands or contracts towards the front bearing box 18 side along the point, and the front bearing box 18 slides on the base frame 30. The relative dead point of the turbine rotor 17 is the rotor thrust disk face with which the turbine rotor expands or contracts toward the electrical end.

3. The 30MW steam turbine with the high back pressure heat supply function is designed to be a reaction type through flow, and is provided with a regulating stage, a uniflow stage and a through flow stage which are I +34 stages in total. And a single-layer cylinder structure is adopted, and a nozzle chamber cylinder adopts a monobloc forging structure. Except for the last-stage partition plate, all the partition plates adopt a pre-twisted assembly type.

4. Considering the operation requirement of high back pressure heat supply of the unit, the 30MW with the high back pressure heat supply function of the invention adopts the last stage blade with small dynamic stress and strong back pressure adapting capability. The dynamic and static clearances and the bearing support structure are reasonably designed, so that the running stability under various working conditions can be met.

5. The invention adopts multi-stage small enthalpy drop reaction vane type, and reasonably selects the flow area, so that the enthalpy drop is more distributed on the small enthalpy drop reaction pressure level, and higher flow efficiency can be obtained.

6. Except for the low-pressure last two-stage partition plate, all the static blades and the movable blades with the rest high pressure and the rest low pressure adopt a pre-twisted assembly type structure, and compared with the traditional welding partition plate, the assembly type structure has no welding line, avoids welding deformation, and better ensures through-flow precision.

Drawings

FIG. 1 is a cross-sectional view of a 30MW steam turbine with high back pressure heat supply according to the present invention;

FIG. 2 is a front view of a 30MW steam turbine with high back pressure heat supply according to the present invention;

FIG. 3 is a side view of a 30MW steam turbine with high back pressure heat supply according to the present invention;

FIG. 4 is a top view of a 30MW steam turbine with high back pressure heat supply according to the present invention.

Detailed Description

The first embodiment is as follows: the embodiment is described with reference to fig. 1 to 4, and the 30MW steam turbine with high back pressure heating function of the embodiment includes a front support assembly, a rear support assembly, a high-low pressure cylinder module and a high-pressure main steam regulating combination valve, where the high-low pressure cylinder module includes a high-low pressure cylinder, a high-pressure front gland seal 4, a high-pressure air inlet side balance ring 5, a low-pressure last stage diaphragm 15, a low-pressure rear gland seal 16, a turbine rotor 17, a nozzle group 28, a diaphragm sleeve group, two base frames 30, a plurality of stationary vanes 29 and a plurality of moving vanes 36, the turbine rotor 17 is horizontally arranged, one end of the turbine rotor 17 is rotatably connected with the front support assembly, the other end of the turbine rotor 17 is rotatably connected with the rear support assembly, the front support assembly and the rear support assembly are respectively installed on the upper portions of the two base frames 30, the base frames 30 are installed on a horizontal ground, and the high-low pressure cylinder is located between the front support assembly and the rear support assembly, the high-low pressure combination cylinder is sleeved on a steam turbine rotor 17 and comprises a cylinder front part 1, a cylinder middle part 2 and a steam exhaust cylinder 3, the cylinder front part 1, the cylinder middle part 2 and the steam exhaust cylinder 3 are sequentially and coaxially connected from a high pressure side to a low pressure side along the length direction of the steam turbine rotor 17, the center of the front end of the cylinder front part 1 is horizontally provided with an assembly hole a along the axis direction, a high-pressure front steam seal 4 is installed on the inner circle of the assembly hole a, the high-pressure front steam seal 4 is sleeved on the steam turbine rotor 17, the center of the rear end of the steam exhaust cylinder 3 is horizontally provided with an assembly hole b along the axis direction, a low-pressure rear steam seal 16 is installed on the inner circle of the assembly hole b, the low-pressure rear steam seal 16 is sleeved on the steam turbine rotor 17, a high-pressure air inlet side balance ring 5, a partition plate sleeve and a low-pressure final partition plate 15 are sequentially arranged inside the high-low pressure combination cylinder from front to back, and the partition plate sleeve is installed on the inner wall of the high-low pressure combination cylinder, the high-pressure air inlet side balance ring 5 is arranged on the inner wall of the front part 1 of the cylinder close to one side of the high-pressure front gland seal 4, the low-pressure final stage clapboard 15 is arranged on the inner wall of the exhaust cylinder 3 close to one side of the low-pressure rear gland seal 16, the inner walls of the clapboard sleeve group and the low-pressure final stage clapboard 15 are provided with a plurality of static blades 29, the outer wall of the turbine rotor 17 is provided with a plurality of moving blades 36, the static blades 29 and the moving blades 36 are arranged in a staggered way, the high-pressure main steam adjusting combined valve comprises a high-pressure main steam pipeline 32, a high-pressure main steam valve 33, a plurality of high-pressure adjusting valves 34 and a plurality of high-pressure air inlet guide pipes 35, the high-pressure main steam pipeline 32 is arranged outside the high-low-pressure pressing cylinder, one end of the high-pressure main steam pipeline 32 is provided with the high-pressure main steam valve 33, the other end of the high-pressure main steam pipeline 32 is provided with the high-pressure adjusting valves 34 along the length direction, the front part 1 of the cylinder is provided with a nozzle group 28, one end of the high-pressure air inlet guide pipe 35 is connected with the high-pressure adjusting valve 34, the other end of the high-pressure steam inlet air duct 35 is connected with the nozzle group 28.

The high-low pressing cylinder of the embodiment is divided into a front part, a middle part and a steam exhaust cylinder three-section structure which are connected through bolts, different materials are used to adapt to the characteristics of the high-temperature working environment of the unit, the strength of the cylinder body is good, the rigidity is good, the thermal stress is small, and a high-narrow flange structure is adopted to adapt to the requirement of quick start of the unit. And the exhaust cylinder adopts a steel plate tailor-welded structure.

The second embodiment is as follows: the present embodiment is described with reference to fig. 1 to 4, and the partition panel set of the present embodiment includes a first partition panel sleeve 6, a second partition panel sleeve 7, a third partition panel sleeve 8, a fourth partition panel sleeve 9, a fifth partition panel sleeve 10, a sixth partition panel sleeve 11, a seventh partition panel sleeve 12, an eighth partition panel sleeve 13 and a ninth partition panel sleeve 14, wherein the first partition panel sleeve 6, the second partition panel sleeve 7, the third partition panel sleeve 8, the fourth partition panel sleeve 9, the fifth partition panel sleeve 10 and the sixth partition panel sleeve 11 are sequentially mounted on the inner wall of the cylinder front portion 1 from front to rear, and the seventh partition panel sleeve 12, the eighth partition panel sleeve 13 and the ninth partition panel sleeve 14 are sequentially mounted on the inner wall of the cylinder middle portion 2 from front to rear. So set up, simplify the cylinder structure, rational assembly through-flow stator blade control stage is apart from between, and the dismouting of being convenient for is changed to can be radially freely expanding after allowing the baffle to be heated, utilize the universalization design of cylinder. Other components and connections are the same as in the first embodiment.

The third concrete implementation mode: the embodiment is described with reference to fig. 1 to 4, the front support assembly of the embodiment includes a front bearing box 18, a thrust support bearing 19, a front bearing box oil retainer ring 20 and a centering beam 21, a mounting hole c is horizontally formed in the center of the rear end of the front bearing box 18 along the axis direction, the front bearing box oil retainer ring 20 is mounted on the inner wall of the mounting hole c, the front bearing box oil retainer ring 20 is sleeved on a turbine rotor 17, one end of the turbine rotor 17 penetrates through the front bearing box oil retainer ring 20 and is rotatably connected with the front bearing box 18 through the thrust support bearing 19, and the centering beam 21 is mounted on the rear end face of the front bearing box 18. So set up, the thermal state inflation of steam turbine is smooth and easy, and it is stable to slide, improves the reliability of operation. Other compositions and connections are the same as in the first or second embodiments.

The fourth concrete implementation mode: the embodiment is described with reference to fig. 1 to 4, the rear support assembly of the embodiment includes a rear bearing box 22, a rear support bearing 23, a rear bearing box oil retainer ring a24 and a rear bearing box oil retainer ring b25, a mounting hole e is horizontally formed in the center of the rear end face of the rear bearing box 22 along the axis direction, a rear bearing box oil retainer ring b25 is installed on the inner wall of the mounting hole e, a mounting hole d is horizontally formed in the center of the front end face of the rear bearing box 22 along the axis direction, a rear bearing box oil retainer ring a24 is installed on the inner wall of the mounting hole d, the rear bearing box oil retainer ring a24 is sleeved on the turbine rotor 17, and the other end of the turbine rotor 17 passes through the rear bearing box oil retainer ring a24 and is rotatably connected to the rear bearing box 22 through the rear support bearing 23. By the arrangement, the support and the following performance of the rotor are ensured, and the stability of a shaft system is ensured. Other compositions and connection relationships are the same as in the first, second or third embodiment.

The fifth concrete implementation mode: the present embodiment is described with reference to fig. 1 to 4, and further includes an atmosphere valve 26, a low-pressure air release hole is formed at the upper portion of the exhaust cylinder 3, and the atmosphere valve 26 is installed in the low-pressure air release hole. So set up, the quick pressure release when the backpressure was too high of can being convenient for guarantees the operation safety. Other compositions and connection relationships are the same as those in the first, second, third or fourth embodiment.

The sixth specific implementation mode: the present embodiment is described with reference to fig. 1, and the present embodiment further includes a barring device 27, and the barring device 27 is mounted on the rear bearing housing 22. So set up, can the barring operation when the unit shuts down the cooling, avoid the rotor crooked. Other compositions and connection relationships are the same as in the first, second, third, fourth or fifth embodiment.

The seventh embodiment: the embodiment is described with reference to fig. 1 to 4, and the embodiment further includes a balance gas pipe 31, one end of the balance gas pipe 31 is communicated with the rear portion of the high-pressure second-stage gland seal, and the other end of the balance gas pipe 31 is communicated with the through-flow 27 stage. With the arrangement, the balance gas pipeline 31 is arranged between the rear part of the high-pressure second-stage steam seal and the through flow 27 stage, so that the thrust generated by the press can be balanced, and the bush burning is avoided. Other compositions and connection relationships are the same as in the first, second, third, fourth, fifth or sixth embodiment.

The specific implementation mode is eight: the present embodiment is described with reference to fig. 1 to 4, and the high-low pressure cylinder of the present embodiment has a single cylinder structure. So set up, have higher efficiency, the low pressure exhaust cylinder unilateral is to the steam extraction down, shortens shafting length, under the prerequisite that the assurance unit has high cycle efficiency, high security, furthest shortens unit length, reduces unit area, practices thrift the space, reduces the construction cost of power plant. Other compositions and connection relationships are the same as those of embodiment one, two, three, four, five, six or seven.

The specific implementation method nine: the embodiment is described with reference to fig. 1, and the high-pressure main steam regulation combined valve of the embodiment adopts a main two-regulation combined valve. According to the arrangement, the main steam adjusting combined valve is adopted by the unit, the steam inlet loss is reduced to the maximum extent, main steam enters the cylinder after entering the high-pressure main steam adjusting combined valve, and enters the condenser through the steam outlet at the lower part of the steam exhaust cylinder after flowing through the through-flow arranged downstream. Other compositions and connection relationships are the same as those in the first, second, third, fourth, fifth, sixth, seventh or eighth embodiment.

The detailed implementation mode is ten: the present embodiment is described with reference to fig. 1 to 4, and the steam inlet parameter of the unit of the present embodiment is 8.83MPa/535 ℃. So set up, improve circulation efficiency at the root. Other compositions and connections are the same as those of the first, second, third, fourth, fifth, sixth, seventh, eighth or ninth embodiments.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.