CN217761088U

CN217761088U - 100MW modified steam turbine blade

Info

Publication number: CN217761088U
Application number: CN202220887077.5U
Authority: CN
Inventors: 孙伟龙; 赵径径; 赵联永; 吴炎; 周秀华
Original assignee: Wuxi Runhe Machinery Co ltd; WUXI RUNHE BLADE MANUFACTURING CO LTD
Current assignee: Wuxi Runhe Machinery Co ltd; WUXI RUNHE BLADE MANUFACTURING CO LTD
Priority date: 2022-04-18
Filing date: 2022-04-18
Publication date: 2022-11-08
Anticipated expiration: 2032-04-18

Abstract

The utility model discloses a 100MW modification steam turbine blade, constitute including blade root, leaf type and shroud, the lower surface mounting of blade root has the leaf type, the shroud of cross-section "U" shape is installed to the lower extreme of leaf type. The 100MW modified steam turbine blade adopts the shroud ring with the inverted U-shaped structure, so that the blade is more convenient to maintain or replace, convenient to position and mount and good in effect; the weight is reduced, the rigidity of the blade is increased, the stress of the blade is reduced, the load bearing capacity is effectively improved, and the efficiency is improved. The application of the series of blades can prolong the service life of the blades of the 100MW modified steam turbine, so that the 100MW modified steam turbine has good safety and economy.

Description

100MW modified steam turbine blade

Technical Field

The utility model relates to a steam turbine technical field specifically is 100MW modification steam turbine blade.

Background

Thermal power generation is the main force of the current power development, and the power plants in China are mainly coal-fired units, and the capacity accounts for 80%. By 2014, the thermal power installed capacity accounts for 75.2% of the total installed capacity. The thermal power plays an important role in the development of national economy and the improvement of the living standard of people.

With the continuous consumption of global energy and the pollution of the environment, the energy utilization rate is forced to be continuously improved, and the emission pollution is reduced. At present, compared with developed countries, the gap of the electric power industry in China is obvious. For power generation, firstly, the heat efficiency of power generation in China is about 40%, and the highest heat efficiency in developed countries is 47%, so that the energy utilization rate is low; secondly, the plant power rate is high, the level of developed countries is 4%, and the level of China is 5.87%; thirdly, the line loss of the power grid in China is large, the line loss at the last stage of nine five is 7.81 percent, and the world average level is 6 percent; fourthly, the emission amount of electric pollution is heavy, and the emission of sulfur dioxide in the electric power industry accounts for 53 percent of the total national emission amount in 2005. The 100MW steam turbine in China is basically the same as the actual high-pressure 100MW steam turbine in the 40's of the Soviet Union. As early as 1990, the national authorities have explicitly proposed: the thermal consumption rate is higher than 100kcal/kwh compared with the foreign unit, the old 100MW unit has high pressure cylinder efficiency of 78-80% and low pressure cylinder efficiency of 71-73%, the foreign unit can reach high pressure cylinder efficiency of more than 86% and low pressure cylinder efficiency of more than 83%, the foreign unit adopts the domestic movable blade has poor safe reliability, the blade fracture accident occurs, the unit is seriously endangered, the full-run unit is operated, the 100MW unit is one of main units of a power grid, the safe, economic and dynamic unit can stably operate, the safe, economic and dynamic unit can save the maximum power consumption of the boiler unit in future, the unit can be improved to 20-30g/kwh as soon as possible, the maximum power consumption of the boiler unit is increased to 10 g/kwh as necessary, and the maximum power of the boiler unit is increased to 10-10 MW is increased once and the economic and the boiler unit is improved continuously; the method greatly improves the operation safety and reliability, improves the flexibility of the unit, enhances the peak regulation capability and prolongs the service life of the unit.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a 100MW modification steam turbine blade to solve current steam turbine group because 100MW steam turbine design age is earlier, design, manufacturing technique are lagged behind, and the reflection is relatively poor at the reliability and the economic nature index of unit, adopts the modification form to further improve the overall efficiency of unit and just seems especially necessary problem.

In order to achieve the above purpose, the utility model provides a following technical scheme: the 100MW modified steam turbine blade comprises a blade root, wherein a blade profile is arranged on the lower surface of the blade root, and a shroud with a reversed U-shaped section is arranged at the lower end of the blade profile.

Preferably, the blade root is a shroud with a structure of n-shaped (door-shaped). The blade root is a U-shaped (door-shaped) shroud, and the shroud structure is as follows: the shroud ring is a rectangular plate, the lower end of the blade shape is fixed on the rectangular plate, and the exposed section of the rectangular plate is a reverse U-shaped plate.

Compared with the prior art, the beneficial effects of the utility model are that: the 100MW modified steam turbine blade adopts a single blade type, a blade root and a shroud to form an integral blade, the shroud of the blade adopts a U-shaped structure shroud, and compared with the traditional shroud, the shroud is more convenient to maintain or replace the blade, convenient to position and install and good in effect; the weight is reduced, the rigidity of the blade is increased, the stress of the blade is reduced, the load bearing capacity is effectively improved, and the efficiency is improved. The blade profile adopts the bent blade profile with good aerodynamic performance, the fatigue strength of the blade is ensured, the service life of the 100MW modified turbine blade is prolonged by applying the series of blades, and the 100MW turbine has good safety and economy.

Drawings

FIG. 1 is a front view of the overall structure of the present invention;

FIG. 2 is a perspective view of the whole structure of the present invention;

fig. 3 is a sectional view of the center of the blade profile of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1, 2 and 3, in which: 1 blade root, 2 blade profiles and 3 shroud. The utility model provides a technical scheme: the 100MW modified steam turbine blade comprises a blade root 1, wherein the blade root 1 adopts a T-shaped blade root, compared with a longitudinal tree-shaped blade root, the blade root and the flange part are made of materials reasonably, the bearing capacity is high, the strength adaptability is good, the blade root and the flange part are installed in an axial single mode, the assembly and the replacement are very convenient, the positioning and the installation are convenient, and the effect is good; the lower surface of the blade root 1 is welded with the blade profile 2, the blade profile 2 is a bent blade profile, the pneumatic performance is good, the core tissue toughness of the blade can be kept, the service life is prolonged, and the fatigue strength of the blade is ensured; the weight is reduced, the integral strength of the blade can be increased, the rigidity of the blade is increased, and the stress of the blade is reduced; effectively improve load bearing capacity, efficiency promotes, increase of service life, and the back is accomplished in the assembly of whole circle blade, can become honeycomb seal with shroud ring whole car, with seal, honeycomb band cooperation, and honeycomb seal can improve the power performance of steam turbine, has simplified the assembly work when installation and repair, has better rotor dynamics characteristic than traditional labyrinth gland sealing. Compared with the traditional labyrinth gland seal, the honeycomb seal reduces the leakage amount, has obvious energy-saving effect and is safe and economic.

The utility model discloses when concrete implementation: the blade is in an integral form by adopting a single blade profile (blade body) 2, a blade root 1 and a shroud band 3, the blade root 1 of the blade adopts a T-shaped blade root (shown in figure 1), and compared with a longitudinal tree-shaped blade root, the blade is convenient to assemble and replace, convenient to position and install and good in effect; the blade profile 2 adopts a bent blade profile with good aerodynamic performance, the toughness of the core tissue of the blade can be kept, and the fatigue strength of the blade is ensured, the lower end of the blade profile 2 is welded with the shroud ring 3, and the shroud ring 3 is positioned at the top of the blade and is in a reverse-U-shaped structure form, so that the blade is more convenient to maintain or replace; the weight is reduced, the integral strength of the blade can be increased, the rigidity of the blade is increased, and the stress of the blade is reduced; effectively improve load bearing capacity, efficiency promotes, increase of service life, and the back is accomplished in the assembly of whole circle blade, can become honeycomb seal with shroud ring whole car, with seal, honeycomb band cooperation, and honeycomb seal can improve the power performance of steam turbine, has simplified the assembly work when installation and repair, has better rotor dynamics characteristic than traditional labyrinth gland sealing. Compared with the traditional labyrinth gland seal, the honeycomb seal has the advantages that the leakage amount is reduced, the energy-saving effect is obvious, safety and economy are realized, the service life of the 100MW modified turbine blade is prolonged by applying the series of blades, and the 100MW modified turbine has good reliability and economy.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A100 MW retrofit steam turbine blade comprising a blade root (1), characterized in that: the lower surface of the blade root (1) is provided with a blade profile (2), and the lower end of the blade profile (2) is provided with a shroud band (3) with an inverted U-shaped section.

2. The 100MW modified steam turbine blade according to claim 1, wherein: the shroud band with the blade root in a reverse-U-shaped structure has the following structure: the shroud ring is a rectangular plate, the lower end of the blade profile is fixed on the rectangular plate, and the exposed section of the rectangular plate is a reverse U-shaped plate.