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Method for determining steam turbine small enthalpy drop blade size considering pre-twisting quantity

A determination method and steam turbine technology, applied to blade support components, mechanical equipment, engine components, etc., can solve problems such as unsafe operation, unreasonable calculation, and affecting steam turbine efficiency, so as to improve safety, improve operation safety, and improve efficiency Improved effect

Active Publication Date: 2019-05-28
HARBIN TURBINE +1
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] The present invention provides a steam turbine small enthalpy drop blade considering the pre-twisted amount in order to solve the problem that the calculation of the pre-twisting amount is not reasonable enough in the design of the size of the small enthalpy drop blade of the steam turbine, resulting in affecting the efficiency of the steam turbine and even unsafe operation. Size determination method

Method used

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  • Method for determining steam turbine small enthalpy drop blade size considering pre-twisting quantity
  • Method for determining steam turbine small enthalpy drop blade size considering pre-twisting quantity
  • Method for determining steam turbine small enthalpy drop blade size considering pre-twisting quantity

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specific Embodiment approach 1

[0020] Specific implementation mode one: combine figure 1 To illustrate this embodiment, this embodiment provides a method for determining the size of a small enthalpy drop blade of a steam turbine considering the pre-twist amount, which specifically includes the following steps:

[0021] Step 1. Determine the pre-twisting amount of the small enthalpy drop blade: Based on the heat and structure of the through-flow, verify whether the blade material can meet the requirements of the pre-twisting design through calculation, and calculate the assembly through mechanical principles when the material meets the requirements. The allowable pre-twist value in the state;

[0022] Step 2. Calculation of the structural size of the small enthalpy drop blade combined with the pre-twist value: according to the obtained pre-twist value, the shroud twist angle in the assembled state is obtained; The key dimensions of twisted blades include blade root pitch, shroud pitch, blade root radial ang...

specific Embodiment approach 2

[0023] Specific embodiment 2: The difference between this embodiment and specific embodiments 1 or 2 is that the method for determining the size of the steam turbine blade with small enthalpy drop considering the pre-twisting amount also includes the following steps:

[0024] Step 3. Perform 3D modeling of the blade: Based on the key dimensions obtained in step 2, use UG software to perform 3D solid modeling of the blade, and initially check the rationality of the design of the blade structure size;

[0025] Step 4, carry out finite element analysis checking: apply ANSA software (general computer-aided engineering CAE pre-processing software) to convert the three-dimensional model into a mesh model, export the inp file of the network model, and import it into ABAQUS software (limited engineering simulation element software); then set material parameters, boundary conditions, etc. in ABAQUS software, and perform finite element calculation and analysis; if the result of the calcu...

specific Embodiment approach 3

[0027] Specific implementation mode three: as figure 2 As shown, the difference between this embodiment and the first embodiment is that the first step specifically includes the following process:

[0028] During the operation of the pre-twisted blade, due to the temperature change, the linear expansion coefficient difference of the blade rotor, centrifugal force and other factors, the shroud will have a certain twist, so the pre-twisted value will change accordingly.

[0029] The pre-twist design is carried out around the pre-twist value, image 3 That is, the change of the pre-twist value of the blade during operation.

[0030] We divide the time into multiple segments according to the change of the pre-twist value. For the moving blades in the high temperature zone, several important time points are:

[0031] A0: assembly state;

[0032] A1: When the pre-twist value reaches the maximum value during the first start-up process;

[0033] A2: When the unit reaches a steady...

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Abstract

The invention provides a method for determining the steam turbine small enthalpy drop blade size considering pre-twisting quantity, and belongs to the technical field of steam turbines. The pre-twisting quantity of small enthalpy drop blades is determined firstly; on the basis of the through-flow heating power and structure, through calculation, whether the blade material can meet the pre-twistingdesign need or not can be verified through calculation, and under the condition that it is ensured that the material meets the need, through the mechanics principle, the allowable pre-twisting quantity value under the assembling state is calculated; in combination with the pre-twisting quantity, small enthalpy drop blade structural size calculation is carried out; according to the solved pre-twisting quantity value, the shroud torsion angle under the assembling state is obtained; through the geometric principle, the pre-twisted blade key size is solved and comprises the blade root pitch, theshroud pitch, the blade root radial angle, and the shroud radial angle; and the problems that during existing steam turbine small enthalpy drop blade size design, the calculation of the pre-twisting quantity is not reasonable, the efficiency of a steam turbine is affected, and unsafe running is caused can be solved. The method can be used for steam turbine small enthalpy drop blade design.

Description

technical field [0001] The invention relates to a method for determining the size of a small enthalpy drop blade of a steam turbine, belonging to the technical field of steam turbines. Background technique [0002] The blade is the key part of the steam turbine, and it is also one of the most delicate and important parts. Under extremely harsh conditions, it withstands the combined effects of high temperature, high pressure, huge centrifugal force, steam force, steam excitation force, corrosion and vibration, and water droplet erosion in the wet steam area. Its aerodynamic performance, machining geometry, surface roughness, installation clearance, operating conditions, scaling and other factors all affect the efficiency and output of the steam turbine; its structural design, vibration intensity and operation mode play an important role in the safety and reliability of the unit. decisive influence. [0003] Due to the unreasonable calculation of the pre-twist amount in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D5/14G06F17/50F01D5/22F01D5/30
Inventor 吕智强李宇峰熊继龙李庆张宇刘鑫盛显伟马义良王健朱晓明安杨
Owner HARBIN TURBINE
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