Joint calculation method for strength of transverse stationary blade and cylinder body of steam turbine based on finite elements
A calculation method and finite element technology, applied in calculation, computer-aided design, mechanical equipment, etc., can solve the problem of only considering steam stress, but not considering the thermal deformation and thermal stress of the cylinder, and achieve the effect of a reliable calculation method
Active Publication Date: 2021-10-26
HARBIN TURBINE +1
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Problems solved by technology
[0004] The technical problem to be solved in the present invention is: in order to solve the safety problem caused by the thermal deformation and thermal stress caused by the temperature of the cylinder without considering the steam stress in the existing design; Combined Strength Calculation Method of Stator Vane and Cylinder under Thermo-solid Coupling
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[0032] Below with the accompanying drawings Figure 1 to Figure 7 , to further illustrate the technical solution of the present invention through specific implementation methods:
[0033] The specific calculation steps of the joint strength calculation method based on the finite element method of the steam turbine horizontal vane and cylinder under the action of thermo-solid coupling are as follows:
[0034] Step 1: Establish the finite element model respectively for horizontal vane, cylinder, red collar and bolt, and carry out grid division to the finite element model; Described cylinder comprises upper half cylinder body and lower half cylinder body;
[0035] Step 2: Define the material properties of the transverse vane, cylinder, red collar and bolts;
[0036] Step 3: Check the contact surfaces between the upper half cylinder and the lower half cylinder, the cylinder and the red collar, the horizontal stationary vane and the cylinder, the horizontal stationary vane and the...
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The invention discloses a joint calculation method for strength of a transverse stationary blade and a cylinder body of a steam turbine based on finite elements, and belongs to the field of steam turbine design. The invention aims to solve the safety problem caused by the fact that only steam stress is considered and thermal deformation and thermal stress of a cylinder caused by temperature are not considered in the existing design. The method comprises the following steps: a calculation method can accurately solve an equivalent stress of a transverse stationary blade under the influence of a thermal deformation of a cylinder, and a basis is provided for the design of the transverse stationary blade of a steam turbine; finite element solution is conducted on the coupling of the transverse stationary blade with a cylinder body structure, temperature-stress-strain distribution of all nodes is obtained, and a CEEQ criterion is used to check whether the structure is invalid or not; the stress-strain value obtained through the calculation method can be used for evaluating the safety of the turbine transverse stationary blade during a steady-state operation, and a reliable calculation method is provided for calculation of the stress-strain field of the transverse stationary blade of the steam turbine under the thermosetting coupling condition. The method is mainly used for calculating the equivalent stress, a maximum stress and an equivalent creep strain of the transverse stationary blade and the cylinder.
Description
technical field [0001] The invention belongs to the field of steam turbine design, and in particular relates to a joint calculation method based on finite element strength of steam turbine horizontal vanes and cylinder body. Background technique [0002] With the increasing demand for high-parameter, large-capacity, and high-efficiency steam turbines at home and abroad, the use of red collar-steam inlet volute-horizontal vane structure cylinders has become the mainstream trend of major power plants. This structure has the characteristics of thin wall, small flange and tangential steam inlet, which can effectively avoid cylinder distortion during operation, so as to ensure efficient, stable and flexible operation of the unit. [0003] With the improvement of steam parameters, the increase of steam density will bring many difficulties to the strength and safety evaluation of horizontal vanes and cylinder blocks. It also caused some accidents during operation. In the current ...
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Login to View More IPC IPC(8): G06F30/23F01D9/02F01D25/28G06F119/08G06F119/14
CPCG06F30/23F01D9/02F01D25/28G06F2119/08G06F2119/14
Inventor 刘洋马义良翁振宇王玮祝海义李宇峰魏红阳梁天赋初世明关淳郭魁俊翟彦恺李洪亮王健徐林峰潘劭平
Owner HARBIN TURBINE