High-parameter steam flow guiding structure for small turbines in 1000 MW double reheat units

Abstract

This utility model discloses a high-parameter steam flow guiding structure for a small steam turbine in a million-kilowatt double reheat unit, relating to the field of reheat engine technology. It includes a mounting frame, to which a steam turbine is fixedly connected. A multi-stage flow guiding assembly is provided on the inner wall of the steam delivery pipe of the steam turbine. The multi-stage flow guiding assembly includes a primary plate disposed on the inner wall of the steam delivery pipe. Multiple primary flow guiding holes are opened at the upper end of the primary plate. Through the multi-stage flow guiding assembly, the steam inside the steam delivery pipe of the steam turbine passes sequentially through the primary plate, secondary plate, and tertiary plate. The primary plate initially disperses the high-speed steam, the secondary plate adjusts the flow velocity distribution, and the tertiary plate further refines the steam flow. Utilizing the resistance characteristics of the primary, secondary, and tertiary plates to the steam, it facilitates forced homogenization of the airflow, resulting in uniform and stable steam pressure and flow velocity entering the steam turbine, reducing the risk of rotor vibration.

Description

Technical Field

[0001] This utility model relates to the field of reheat engine technology, specifically to a high-parameter steam flow guiding structure for a small turbine in a million-kilowatt double reheat unit. Background Technology

[0002] With the power industry's pursuit of energy conversion efficiency, in million-kilowatt double reheat units, the small steam turbine needs to complete the start-up process under high temperature, high pressure, and high flow rate steam conditions, which places extremely high demands on the steam guide structure.

[0003] In existing technologies, traditional flow guiding structures are difficult to precisely control the steam flow direction and velocity, resulting in uneven airflow distribution, unbalanced forces on the small turbine rotor, and strong vibrations. These vibrations not only affect the stability of equipment operation but also accelerate the wear of equipment components, shorten the service life of the equipment, and increase equipment maintenance costs and the frequency of shutdowns for repairs. Therefore, there is an urgent need for a high-parameter steam flow guiding structure for the small turbine of a million-kilowatt double reheat unit to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a high-parameter steam flow guiding structure for a small turbine in a million-kilowatt double reheat unit, in order to solve the problem that the traditional flow guiding structure mentioned in the background art is prone to uneven airflow distribution under high-parameter steam impact, resulting in uneven force on the small turbine rotor and potential vibration hazards.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a high-parameter steam flow guiding structure for a small steam turbine in a million-kilowatt double reheat unit, including a mounting frame, on the top surface of which a steam turbine is fixedly connected, and the inner wall of the steam delivery pipe of the steam turbine is provided with multi-stage flow guiding components;

[0006] The multi-stage flow guiding assembly includes a primary plate disposed on the inner wall of the steam conveying pipe of the steam turbine. The upper end of the primary plate has multiple primary flow guiding holes. The lower end of the primary plate has a secondary plate disposed on the upper end of the secondary plate, which has multiple secondary flow guiding holes. The lower end of the secondary plate has a tertiary plate disposed on the upper end of the tertiary plate, which has multiple tertiary flow guiding holes.

[0007] Preferably, the inner wall of the steam turbine steam delivery pipe is provided with multiple limiting grooves, and the first-stage plate, the second-stage plate and the third-stage plate are slidably connected to the inner wall of the limiting grooves respectively.

[0008] Preferably, the inner wall of the limiting groove is slidably connected to a reinforcing frame, and the first-level plate, the second-level plate, and the third-level plate are respectively fixedly connected to the inner wall of the reinforcing frame.

[0009] Preferably, the inner wall of the limiting groove is provided with multiple fixing grooves, and a compression spring is fixedly connected to the inner wall of the fixing groove. The upper ends of the multiple compression springs are fixedly connected to the lower end of the reinforcing frame.

[0010] Preferably, the diameter of the primary guide hole is larger than the diameter of the secondary guide hole, and the diameter of the secondary guide hole is larger than the diameter of the tertiary guide hole.

[0011] Preferably, a fixing frame is fixedly connected to the surface of the steam conveying pipe of the steam turbine, and the bottom surface of the fixing frame is fixedly connected to the surface of the mounting frame.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] By setting up a multi-stage flow guiding component, the steam inside the steam delivery pipe of the steam turbine passes through the first-stage plate, the second-stage plate and the third-stage plate in sequence. The first-stage plate first disperses the high-speed steam, the second-stage plate adjusts the flow velocity distribution, and the third-stage plate further refines the steam flow. By utilizing the resistance characteristics of the first-stage plate, the second-stage plate and the third-stage plate to the steam, it is easy to force homogenize the airflow, so that the steam pressure and flow velocity entering the steam turbine are uniform and stable, reducing the risk of rotor vibration. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0015] Figure 2 This is a cross-sectional view of the multi-stage flow guiding component of this utility model;

[0016] Figure 3 for Figure 2 Enlarged structural diagram at point A in the middle.

[0017] In the diagram: 1. Mounting bracket; 2. Steam turbine; 3. Multi-stage flow guide assembly; 301. First-stage plate; 302. First-stage flow guide hole; 303. Second-stage plate; 304. Second-stage flow guide hole; 305. Third-stage plate; 306. Third-stage flow guide hole; 307. Reinforcing frame; 308. Fixing groove; 309. Compression spring; 310. Limiting groove; 4. Fixing bracket. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figures 1-3The present invention provides a high-parameter steam flow guiding structure for a small steam turbine in a million-kilowatt double reheat unit. The structure includes a mounting frame 1, with a steam turbine 2 fixedly connected to the top surface of the mounting frame 1. A multi-stage flow guiding assembly 3 is installed on the inner wall of the steam delivery pipe of the steam turbine 2. The multi-stage flow guiding assembly 3 includes a primary plate 301, which is installed on the inner wall of the steam delivery pipe of the steam turbine 2. The upper end of the primary plate 301 has multiple primary flow guiding holes 302. The lower end of the primary plate 301 has a secondary plate 303, the upper end of the secondary plate 303 has multiple secondary flow guiding holes 304, and the lower end of the secondary plate 303 has a tertiary plate 305. The upper end of the third-stage plate 305 is provided with multiple third-stage guide holes 306. Through the multi-stage guide assembly 3, the steam inside the steam delivery pipe of the turbine 2 passes through the first-stage plate 301, the second-stage plate 303 and the third-stage plate 305 in sequence. The first-stage plate 301 first disperses the high-speed steam, the second-stage plate 303 adjusts the flow velocity distribution, and the third-stage plate 305 further refines the steam flow. By utilizing the resistance characteristics of the first-stage plate 301, the second-stage plate 303 and the third-stage plate 305 to the steam, it is easy to force homogenize the airflow, so that the steam pressure and flow velocity entering the steam delivery pipe of the turbine 2 are uniform and stable, reducing the risk of rotor vibration.

[0020] Furthermore, the inner wall of the steam transmission pipe of the turbine 2 is provided with multiple limiting grooves 310. The first-stage plate 301, the second-stage plate 303, and the third-stage plate 305 are slidably connected to the inner wall of the limiting grooves 310. The limiting grooves 310 facilitate the limiting of the first-stage plate 301, the second-stage plate 303, and the third-stage plate 305, preventing them from detaching from the interior of the steam transmission pipe of the turbine 2.

[0021] Furthermore, a reinforcing frame 307 is slidably connected to the inner wall of the limiting groove 310. The first-level plate 301, the second-level plate 303, and the third-level plate 305 are respectively fixedly connected to the inner wall of the reinforcing frame 307. The reinforcing frame 307 facilitates the prevention of damage to the first-level plate 301, the second-level plate 303, and the third-level plate 305, thereby improving their service life.

[0022] Furthermore, the inner wall of the limiting groove 310 is provided with multiple fixing grooves 308, and the inner wall of the fixing groove 308 is fixedly connected with compression springs 309. The upper ends of the multiple compression springs 309 are fixedly connected to the lower end of the reinforcing frame 307. The first-stage plate 301, the second-stage plate 303, the third-stage plate 305, the compression springs 309 and the reinforcing frame 307 are all made of high-temperature resistant stainless steel. The compression springs 309 facilitate the buffering of the first-stage plate 301, the second-stage plate 303 and the third-stage plate 305, reducing the vibration of the steam conveying pipe of the steam turbine 2 caused by steam impact.

[0023] Furthermore, the diameter of the primary guide hole 302 is larger than that of the secondary guide hole 304, and the diameter of the secondary guide hole 304 is larger than that of the tertiary guide hole 306. By setting the primary guide hole 302, the secondary guide hole 304 and the tertiary guide hole 306 with diameters decreasing sequentially, it is convenient to disperse, adjust and refine the steam.

[0024] Furthermore, a fixing frame 4 is fixedly connected to the surface of the steam transmission pipe of the steam turbine 2. The bottom surface of the fixing frame 4 is fixedly connected to the surface of the mounting frame 1. The fixing frame 4 facilitates the fixing of the steam transmission pipe of the steam turbine 2, preventing the steam transmission pipe of the steam turbine 2 from vibrating due to the impact of steam, thereby affecting the stability of the internal steam transmission.

[0025] Working principle: During operation, the multi-stage flow guiding component 3 allows the steam inside the steam delivery pipe of the turbine 2 to pass sequentially through the first-stage plate 301, the second-stage plate 303, and the third-stage plate 305. The first-stage plate 301 initially disperses the high-speed steam, the second-stage plate 303 adjusts the flow velocity distribution, and the third-stage plate 305 further refines the steam flow. By utilizing the resistance characteristics of the first-stage plate 301, the second-stage plate 303, and the third-stage plate 305 to the steam, it is easy to force homogenize the airflow, making the steam pressure and flow velocity entering the turbine 2 uniform and stable, reducing the risk of rotor vibration. The compression spring 309 facilitates the buffering of the first-stage plate 301, the second-stage plate 303, and the third-stage plate 305, reducing the vibration of the steam delivery pipe of the turbine 2 caused by steam impact, and improving the stability of steam delivery.

[0026] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A high parameter rotating start-up steam flow guide structure for a small steam turbine of a 1000 MW double-reheat unit, comprising a mounting frame (1), characterized in that: The top surface of the mounting bracket (1) is fixedly connected to a steam turbine (2), and the inner wall of the steam conveying pipe of the steam turbine (2) is provided with a multi-stage flow guiding assembly (3); The multi-stage flow guiding assembly (3) includes a primary plate (301), which is disposed on the inner wall of the steam conveying pipe of the steam turbine (2). The upper end of the primary plate (301) is provided with a plurality of primary flow guiding holes (302). The lower end of the primary plate (301) is provided with a secondary plate (303), the upper end of the secondary plate (303) is provided with a plurality of secondary flow guiding holes (304), the lower end of the secondary plate (303) is provided with a tertiary plate (305), and the upper end of the tertiary plate (305) is provided with a plurality of tertiary flow guiding holes (306).

2. The high parameter turning gear steam flow guide structure for a small turbine of a 1000-MW double-reheat unit, according to claim 1, characterized in that: The inner wall of the steam conveying pipe of the steam turbine (2) is provided with multiple limiting grooves (310), and the first-stage plate (301), the second-stage plate (303), and the third-stage plate (305) are slidably connected to the inner wall of the limiting grooves (310).

3. The high parameter turning gear steam flow guide structure for a small steam turbine of a 1000-MW double-reheat unit, according to claim 2, characterized in that: The inner wall of the limiting groove (310) is slidably connected to a reinforcing frame (307), and the first-level plate (301), the second-level plate (303), and the third-level plate (305) are respectively fixedly connected to the inner wall of the reinforcing frame (307).

4. The high parameter turning gear steam flow guide structure for a small steam turbine of a 1000-MW double-reheat unit, according to claim 2, characterized in that: The inner wall of the limiting groove (310) is provided with a plurality of fixing grooves (308), and a compression spring (309) is fixedly connected to the inner wall of the fixing groove (308). The upper ends of the plurality of compression springs (309) are fixedly connected to the lower end of the reinforcing frame (307).

5. The high-parameter steam flow guiding structure for the small turbine of a million-kilowatt double reheat unit according to claim 1, characterized in that: The diameter of the primary guide hole (302) is larger than that of the secondary guide hole (304), and the diameter of the secondary guide hole (304) is larger than that of the tertiary guide hole (306).

6. The high-parameter steam flow guiding structure for the small turbine of a million-kilowatt double reheat unit according to claim 1, characterized in that: The surface of the steam conveying pipe of the steam turbine (2) is fixedly connected to a fixing frame (4), and the bottom surface of the fixing frame (4) is fixedly connected to the surface of the mounting frame (1).

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