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A low-pressure cylinder of an air-cooled steam turbine

A technology for steam turbines and low-pressure cylinders, which is applied in the field of steam turbines in power stations. It can solve the problems of dynamic and static friction of low-pressure cylinders, large thermal deformation, and large thermal stress at rounded corners, so as to improve rigidity, reduce thermal stress and thermal deformation, and improve operation safety. sexual effect

Active Publication Date: 2014-10-15
SHANGHAI POWER EQUIP RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing problem is that due to the small fillet radius, the thermal stress of the fillet is large, resulting in large thermal deformation. The low-pressure inner cylinder of the air-cooled steam turbine is running frequently. Dynamic and static grinding

Method used

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  • A low-pressure cylinder of an air-cooled steam turbine
  • A low-pressure cylinder of an air-cooled steam turbine

Examples

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Effect test

Embodiment 1

[0018] A certain type of air-cooled supercritical steam turbine, 660MW, the height of the last stage blade is 664mm, the steam inlet parameter of the steam turbine is 24.2MPa / 566°C / 566°C, the overall structure of single-shaft three-cylinder four-exhaust steam is adopted, and the two low-pressure cylinders are identical. The exhaust of the low-pressure cylinder is air-cooled, and the design back pressure is 12kPa. The low-pressure inner cylinder of this type of air-cooled steam turbine is as follows: figure 1 As shown in the original design plan, the rounded corners of each part of the flange of the low-pressure inner cylinder are 20mm, the rounded corner radius of part A of the new technology plan is 150mm, and the rounded corner radius of parts B and C is 65mm. D. The fillet radius of part E, part F and part G is 70mm, and there are two first building blocks 1 and two second building blocks 2 respectively on the left and right sides of the middle parting surface of the lower ...

Embodiment 2

[0020] A certain type of air-cooled ultra-supercritical steam turbine, 700MW, the height of the last stage blade is 915mm, the steam inlet parameter of the steam turbine is 25MPa / 600℃ / 600℃, the overall structure of single shaft, two cylinders and two exhaust steam is adopted, and there is one low pressure cylinder, The exhaust of the low-pressure cylinder is air-cooled, and the design back pressure is 15kPa. The low-pressure inner cylinder of this type of air-cooled steam turbine is as follows: figure 2 As shown in the original design plan, the rounded corners of the A', B', C', D', E' parts of the facets in the flange of the low-pressure inner cylinder are 20mm, and the new technology plan A', B', C', D The fillet radius of each part of ', E', and F' is 50mm; there are two first building blocks 1 and two second building blocks 2 on the left and right sides of the middle split surface of the lower half cylinder respectively, the first building block 1 and the second building ...

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Abstract

The invention relates to a low pressure cylinder of an air-cooled type steam turbine. The low pressure cylinder comprises a low pressure inner cylinder, wherein the low pressure inner cylinder comprises an upper half cylinder and a lower half cylinder. The low pressure cylinder is characterized in that: the left side and the right side of a split of the lower half cylinder are respectively provided with at least one first lapping block and at least one second lapping block; and the heights L of the first lapping block and the second lapping block are 150mm to 350mm. According to the low pressure cylinder of the air-cooled type steam turbine provided by the invention, a flange split big fillet structure and a low pressure inner cylinder short lapping block support structure are adopted, and the outer surface of the low pressure inner cylinder is additionally provided with asymmetrical heat insulation covers for the upper and lower half cylinders, so that the rigidity of the low pressure inner cylinder of the air-cooled type stream turbine is enhanced, the heat stress and the heat deformation of the low pressure inner cylinder of the air-cooled type steam turbine are reduced, and the running safety of a structure of the low pressure cylinder of the air-cooled type stream turbine is improved.

Description

technical field [0001] The invention relates to a low-pressure cylinder of an air-cooled steam turbine, which belongs to the technical field of power station steam turbines. Background technique [0002] The design back pressure of the air-cooled steam turbine is 12kPa to 18kPa, the design back pressure of the wet-cooled steam turbine is 4.9kPa, and the design back pressure of the air-cooled steam turbine is about 3 times that of the wet-cooled steam turbine. The back pressure range of the air-cooled steam turbine is 6kPa to 55kPa, the back pressure range of the wet-cooled steam turbine is 4.5kPa to 12kPa, and the back pressure range of the air-cooled steam turbine is about 6 times that of the wet-cooled steam turbine. The back pressure of the wet-cooled steam turbine changes monthly, and the back pressure of the air-cooled steam turbine changes daily and frequently. Due to the high back pressure of the air-cooled steam turbine, the large range of back pressure changes and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01D25/28F01D25/08
Inventor 史进渊何阿平危奇阳虹杨宇沈国平邓志成蒋浦宁汪勇
Owner SHANGHAI POWER EQUIP RES INST