阅读说明：本技术 一种仿金刚石晶胞拓扑的汽轮机空心静叶强化除湿结构及汽轮机除湿装置 (Hollow quiet leaf of imitative diamond cell topology's steam turbine strengthens dehumidification structure and steam turbine dehydrating unit ) 是由 谢诞梅 吴凡 岳亚楠 王纯 姜伟 韩安 梅子岳 于 2020-12-18 设计创作，主要内容包括：本发明公开了一种仿金刚石晶胞拓扑的汽轮机空心静叶强化除湿结构及汽轮机除湿装置,除湿装置包括多级汽轮机静叶,每级汽轮机静叶内均设有用于蒸汽加热除湿的空腔,汽轮机静叶的空腔内以金刚石晶胞成键方式为模板的仿生拓扑结构,仿生拓扑结构最小结构单元由一个中心连接件与四个角连接件通过柱体连接件连接构成；每个角连接件又作为新结构单元的中心连接件与另外四个角连接件通过柱体连接件相连,重复延伸扩展,形成充满整个静叶空腔用于强化传热的骨架。本发明有效提高空心静叶除湿性能的同时,增强其本身结构强度,使得相同结构材料可以用于更长的静叶片,有利于提高汽轮机性能。(The invention discloses a diamond cell topology-simulated steam turbine hollow stationary blade reinforced dehumidification structure and a steam turbine dehumidification device, wherein the dehumidification device comprises a plurality of stages of steam turbine stationary blades, each stage of steam turbine stationary blade is internally provided with a cavity for steam heating and dehumidification, a bionic topology structure taking a diamond cell bonding mode as a template is arranged in the cavity of each steam turbine stationary blade, and a minimum structural unit of the bionic topology structure is formed by connecting a central connecting piece and four corner connecting pieces through cylinder connecting pieces; each corner connecting piece is used as a central connecting piece of the new structure unit and is connected with the other four corner connecting pieces through the cylinder connecting pieces, and the extending and the expanding are repeated to form a framework which is filled in the cavity of the whole static blade and is used for strengthening heat transfer. The invention can effectively improve the dehumidification performance of the hollow stator blade, and simultaneously enhance the structural strength of the hollow stator blade, so that the same structural material can be used for longer stator blades, and the improvement of the performance of a steam turbine is facilitated.)

1. The utility model provides a hollow quiet leaf of steam turbine of imitative diamond unit cell topology reinforces dehumidification structure, includes the quiet leaf of steam turbine, be equipped with the cavity that is used for steam heating dehumidification in the quiet leaf of steam turbine, its characterized in that: a bionic topological structure taking a diamond unit cell bonding mode as a template is arranged in a cavity of the turbine stationary blade, and a minimum structural unit of the bionic topological structure is formed by connecting a central connecting piece and four corner connecting pieces through cylinder connecting pieces; each corner connecting piece is used as a central connecting piece of the new structure unit and is connected with the other four corner connecting pieces through the cylinder connecting pieces, and the extending and the expanding are repeated to form a framework which is filled in the cavity of the whole static blade and is used for strengthening heat transfer.

2. The steam turbine hollow vane enhanced dehumidification structure as set forth in claim 1, wherein: in the bionic topological structure, the cylinder connecting piece is a cylinder or a polygon prism.

3. The steam turbine hollow vane enhanced dehumidification structure as set forth in claim 2, wherein: the central connecting piece and the corner connecting piece are of the same structure and are spheres or polyhedrons.

4. The steam turbine hollow vane enhanced dehumidification structure of claim 3, wherein: the central connecting piece and the corner connecting pieces are round balls, the diameter of each round ball is recorded as d, the perimeter of the section of a cylinder connected with the round balls is P, the height of the cylinder is L, and P <2 pi d is met, and L is greater than 1.5 d.

5. The steam turbine hollow vane enhanced dehumidification structure as set forth in any one of claims 1 to 4, wherein: in each minimum structure unit, four corner connecting pieces are connected to form a regular tetrahedron.

6. The steam turbine hollow vane enhanced dehumidification structure as set forth in any one of claims 1 to 4, wherein: the cavities are distributed in the whole turbine stationary blade or the surface of the turbine stationary blade with thicker condensed water film distribution.

7. The utility model provides a steam turbine dehydrating unit, includes multistage steam turbine stationary blade, its characterized in that: a cavity for steam heating and dehumidification is arranged in each stage of steam turbine stationary blade, a steam inlet of the cavity in each stage of steam turbine stationary blade corresponds to a steam outlet of the previous stage of hollow stationary blade, a bionic topological structure taking a diamond unit cell bonding mode as a template is arranged in the cavity of the steam turbine stationary blade, and a minimum structural unit of the bionic topological structure is formed by connecting a central connecting piece and four corner connecting pieces through cylinder connecting pieces; each corner connecting piece is used as a central connecting piece of the new structure unit and is connected with the other four corner connecting pieces through the cylinder connecting pieces, and the extending and the expanding are repeated to form a framework which is filled in the cavity of the whole static blade and is used for strengthening heat transfer.

Technical Field

The invention belongs to the field of steam turbines, relates to a hollow long stationary blade dehumidification technology, and particularly relates to a diamond unit cell topology-simulated steam turbine hollow stationary blade reinforced dehumidification structure and a steam turbine dehumidification device.

Background

The electric power equipment in China continuously develops towards high capacity, high efficiency and safety, and the design and development of the original long blade of the steam turbine are important requirements for the manufacturing autonomy of large-scale power equipment in China. The wet steam erosion under the design condition is an important factor influencing the safe and efficient operation of the steam turbine, and the problem of the wet steam of the long blade of the high-power steam turbine is particularly outstanding. The hollow stator blade is a widely used dehumidification method, and high-temperature steam is introduced into a cavity to heat the blade to achieve the dehumidification effect. More advanced, original, autonomous long blades require more advanced vane cavity structures. Diamond is the hardest substance naturally occurring in nature, in which carbon atoms in the unit cell are connected to each other in a tetrahedrally bonded manner. By taking the excellent mechanical structure of diamond as a reference, a periodic topological structure unit with mesoscale is manufactured by imitating a crystal cell of the excellent mechanical structure, and the excellent mechanical structure is applied to an internal channel of a turbine stator blade.

Disclosure of Invention

The technical problem of the invention is mainly solved by the following technical scheme:

the utility model provides a hollow quiet leaf of steam turbine of imitative diamond unit cell topology reinforces dehumidification structure, includes the quiet leaf of steam turbine, be equipped with the cavity that is used for steam heating dehumidification in the quiet leaf of steam turbine, its characterized in that: a bionic topological structure taking a diamond unit cell bonding mode as a template is arranged in a cavity of the turbine stationary blade, and a minimum structural unit of the bionic topological structure is formed by connecting a central connecting piece and four corner connecting pieces through cylinder connecting pieces; each corner connecting piece is used as a central connecting piece of the new structure unit and is connected with the other four corner connecting pieces through the cylinder connecting pieces, and the extending and the expanding are repeated to form a framework which is filled in the cavity of the whole static blade and is used for strengthening heat transfer.

Further, in the bionic topological structure, the cylinder connecting piece is a cylinder or a polygon prism.

Further, the central connecting piece and the corner connecting piece are of the same structure and are spheres or polyhedrons.

Furthermore, the central connecting piece and the corner connecting pieces are round balls, the diameter of each round ball is recorded as d, the perimeter of the section of a cylinder connecting the round balls is P, the height of the cylinder is L, and P <2 pi d is met, and L is greater than 1.5 d.

Furthermore, in each minimum structural unit, four corner connecting pieces are connected to form a regular tetrahedron.

Further, the cavities are distributed in the whole turbine stator blade or the surface of the turbine stator blade with thicker distribution of the condensed water film.

The utility model provides a steam turbine dehydrating unit, includes multistage steam turbine stationary blade, its characterized in that: a cavity for steam heating and dehumidification is arranged in each stage of steam turbine stationary blade, a steam inlet of the cavity in each stage of steam turbine stationary blade corresponds to a steam outlet of the previous stage of hollow stationary blade, a bionic topological structure taking a diamond unit cell bonding mode as a template is arranged in the cavity of the steam turbine stationary blade, and a minimum structural unit of the bionic topological structure is formed by connecting a central connecting piece and four corner connecting pieces through cylinder connecting pieces; each corner connecting piece is used as a central connecting piece of the new structure unit and is connected with the other four corner connecting pieces through the cylinder connecting pieces, and the extending and the expanding are repeated to form a framework which is filled in the cavity of the whole static blade and is used for strengthening heat transfer.

Further, the angle between each two cylinders attached to the same sphere is 109 ° 28' 16 ".

Furthermore, the parameters d, P and L of the topological structure range from micron level to millimeter level.

In the steam turbine dehumidification hollow long stationary blade channel structure imitating the diamond unit cell topology, high-temperature heating steam is extracted from the outlet of the stationary blade at the front stage.

In the steam turbine dehumidification hollow long stationary blade channel structure imitating the diamond unit cell topology, the range of the hollow cavity of the stationary blade can be a whole branch, and the hollow cavity of the stationary blade can also be distributed near the surface with thicker distribution of a condensed water film.

Therefore, the invention has the following advantages:

according to the invention, the topological structure is arranged in the cavity of the existing hollow stationary blade of the steam turbine, so that the higher high-temperature steam turbulence degree and the maximum heat transfer strength can be obtained, the dehumidification performance is improved, the erosion of the blades of the steam turbine is reduced, the strength of the hollow stationary blade of the steam turbine can be greatly improved, the longer stationary blade can be designed, and the energy conversion efficiency of the steam turbine is improved.

The steam after the last-stage stationary blade quotes the next-last-stage stationary blade is distributed in the whole cavity more uniformly and effectively after the high-temperature heating steam passes through the bionic topological structure. The ball and the cylinder that increase have also increased the heat transfer area of quiet leaf cavity when playing the vortex effect, and the increase of turbulence degree and heat transfer area will make the cavity of taking bionical topological structure passageway possess more outstanding heating dehumidification effect.

Drawings

FIG. 1 is a schematic diagram of a bionic topology structure in a cavity of a turbine stator blade in an embodiment of the invention.

FIG. 2 is a schematic view of a vane cavity with a bionic topology.

FIG. 3 is a sectional view of a high temperature heating steam path within a turbine vane.

FIG. 4 is a high temperature steam flow diagram within a vane cavity.

Fig. 5 is a schematic diagram showing comparison of water film thickness on a pressure surface of a hollow stationary blade with or without a bionic topological structure, wherein fig. 5(a) is a simulation diagram of water film thickness on a pressure surface of a stationary blade of a steam turbine without a bionic topological structure, and fig. 5(b) is a simulation diagram of water film thickness on a pressure surface of a stationary blade of a steam turbine with a bionic topological structure (about 5% of high-temperature steam flow (Gs) after a next-last stationary blade is to be extracted).

FIG. 6 is a schematic view of a turbine vane structure having a partially biomimetic configuration.

Fig. 7 is a schematic diagram showing comparison of water film thicknesses on pressure surfaces of hollow stationary blades of local and overall bionic topological structures, where fig. 7(a) is a simulation diagram of the water film thickness on the pressure surface of a stationary blade of a steam turbine of the local bionic topological structure (about 4% of the high-temperature steam flow (Gs) after the next-last stationary blade is to be extracted), and fig. 7(b) is a simulation diagram of the water film thickness on the pressure surface of a stationary blade of a steam turbine of the overall bionic topological structure (about 5% of the high-temperature steam flow (Gs) after the next-last stationary blade is to be extracted).

Reference numerals, 1-sphere, 2-cylinder, 3-bionic topology, 4-stator cavity, 5-blade root, 6-final stator blade, 7-penultimate stator blade, 8-control valve, 9-steam outlet, 10-steam inlet,

Detailed Description

The technical scheme of the invention is further specifically described by the implementation example and the accompanying drawings.

A steam turbine dehumidification device comprises multiple stages of steam turbine stationary blades, wherein cavities for steam heating and dehumidification are arranged in each stage of steam turbine stationary blade, a steam inlet of the cavity in each stage of steam turbine stationary blade corresponds to a steam outlet of a previous stage of hollow stationary blade (generally, the steam inlet is connected with a pipeline and is provided with a valve for controlling the steam flow), a reinforced dehumidification structure is arranged in the cavity in each stage of steam turbine stationary blade, the reinforced dehumidification structure is a bionic topological structure which is arranged in the cavity of the steam turbine stationary blade and takes a diamond unit cell bonding mode as a template, and a minimum structural unit of the bionic topological structure is formed by connecting a central connecting piece and four corner connecting pieces through cylinder connecting pieces; each corner connecting piece is used as a central connecting piece of the new structure unit and is connected with the other four corner connecting pieces through the cylinder connecting pieces, and the extending and the expanding are repeated to form a framework which is filled in the cavity of the whole static blade and is used for strengthening heat transfer.

In the bionic topological structure, the cylinder connecting piece is a cylindrical polygon prism, and the central connecting piece and the angle connecting piece have the same structure and are spheres or polyhedrons. In this embodiment, the central connecting member and the corner connecting member are both round balls, the diameter of each round ball is denoted by d, the perimeter of the cross section of a cylinder connecting the round balls is P, and the height of the cylinder is L, so that P <2 pi d, and L >1.5d are satisfied.

The bionic topology of the thermal power low-voltage final stage stationary blade is taken as an example for explanation.

As shown in figure 1, a schematic diagram shows the arrangement mode of a bionic topological structure, each round ball 1 with the diameter d of 13mm is connected with four cylinders 2 with the section perimeter P of 10 pi mm and the length L of 30mm, and the included angle between every two cylinders 2 connected with the same round ball 1 is 109 degrees, 28' 16 degrees. The bionic topological structure 3 continuously extends to fill the cavity of the turbine stationary blade to form a framework filled in the heating channel for strengthening heat transfer, the joint of the bionic topological structure and the wall surface of the cavity can be any section on a sphere or a cylinder, namely, the bionic topological structure is firstly installed to design the framework, and when the bionic topological structure is intersected with the wall surface of the cavity, the bionic topological structure is cut off at the joint, namely, the bionic topological structure is the joint surface with the wall surface of the cavity.

As shown in fig. 2, the schematic diagram shows a stator blade cavity 4 with a bionic topology 3, in this example the water film deposition of the stator blade mainly occurs on the pressure side in the blade root 5-65% of the blade height area, so the stator blade cavity is arranged in this section.

As shown in fig. 3, a detailed structure of the heating system is shown in a sectional view, in this example, high-temperature steam for heating the last-stage stationary blade 6 comes from the steam outlet 9 of the preceding-stage stationary blade, i.e., the penultimate stationary blade 7, a communication pipeline is arranged between the steam inlet 10 of the last-stage stationary blade 6 and the steam outlet 9 of the penultimate stationary blade 7, and a control valve 8 is additionally arranged at the steam outlet of the penultimate stationary blade 7 to control the air-bleed portion, so that the effect of reasonably utilizing the preceding-stage high-temperature steam is achieved in cooperation with the heating intensity under different working conditions. Under the design conditions illustrated in this example, about 5% of the post-penultimate high temperature steam flow (Gs) is to be extracted to heat the last stage vanes. When the working condition is changed, the temperature of the final stage is increased, the humidity is reduced, and the opening degree of the valve can be properly reduced to ensure the economy of the heating system.

As shown in FIG. 4, a stationary blade cavity internal flow diagram of a bionic topology is given. In the embodiment, high-temperature steam is introduced into the cavity in a direction perpendicular to the section of the blade root, and is more uniformly and effectively distributed in the whole cavity after passing through the bionic topological structure. The added ball and the cylinder play a role of turbulence and also increase the heat exchange area of the static blade cavity, and the increase of the turbulence degree and the heat exchange area enables the channel with the bionic topological structureThe cavity has more excellent heating and dehumidifying effects. As shown in FIG. 5, the vane pressure face water film thickness using the original channel-free structure cavity and the bionic topological structure channel cavity is given. In the bionic stationary blade in the figure 5(b), 5% Gs is introduced, under the action of the bionic topological structure, the concentration area of the water film on the pressure surface is basically eliminated, and the maximum water film thickness of the blade skin surface is reduced by one magnitude from 3.1 multiplied by 10^-6Reduced to 5.7X 10^-7The diameter of water drops formed after film breaking can be greatly reduced, and the wet steam loss of the static blades and the following movable blades is greatly reduced.

As shown in FIG. 6, a blade profile of a partially bionic stator blade cavity structure is shown. According to the water film distribution shown in fig. 5(a), the solid blade is restored in the region with thin water film and less distribution at the upstream of the stationary blade, and the bionic cavity structure near and at the downstream of the leading edge is reserved to heat the water films deposited on the back pressure surface and the downstream pressure surface of the evaporation leading edge. With this targeted arrangement, the foreline high temperature steam can be utilized more efficiently. As shown in fig. 7, the local bionic structure cavity stator blade arranged can achieve the dehumidification effect of the same grade when 4% Gs is used, namely, the dehumidification effect of the stator blade using 5% Gs is achieved.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.