A steam turbine medium pressure single-layer welded cylinder structure

A single-layer cylinder and steam turbine technology, applied in the field of steam turbine medium pressure cylinders, can solve the problems of positioning shoulder blade deformation, affecting the economy of the unit, leakage, etc., and achieve the effects of reducing pipeline losses, solving high costs, and improving the uniformity of steam flow.

Active Publication Date: 2019-06-18
DONGFANG TURBINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Since one end of the medium-pressure steam inlet pipe 4 is placed on the medium-pressure inner cylinder 2, and the other end extends into the medium-pressure outer cylinder 1, and the seal ring 5 is used to seal each other, the reheat steam passes through the seal along the flow direction V of the reheat steam. The gap between the ring 5 leaks into the interlayer between the medium-pressure inner and outer cylinders 1 and 2, and the leaked steam flows in the direction V L ;The extraction chamber 9 of the medium-pressure fourth stage is formed by sealing two positioning shoulders between the partition sleeve 3 and the medium-pressure outer cylinder 1; since there is a temperature difference of about 100°C on both sides of the positioning shoulders, when the unit is running It is easy to cause the deformation of the positioning shoulder blade, causing the steam of the third stage extraction to leak to the fourth stage extraction and the leakage of the fourth stage extraction steam to the middle row, which affects the economy of the unit

Method used

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  • A steam turbine medium pressure single-layer welded cylinder structure
  • A steam turbine medium pressure single-layer welded cylinder structure
  • A steam turbine medium pressure single-layer welded cylinder structure

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Embodiment 1

[0028] Such as Figure 7 , Figure 9 The structure of the single-flow medium-pressure cylinder shown in the figure, this single-layer welded medium-pressure cylinder structure is composed of W-V-Nb-N cast steel material in the high-temperature zone 6 of the medium-pressure cylinder and Cr-Mo-V cast steel in the low-temperature zone 7 of the medium-pressure cylinder The materials are welded separately. The W-V-Nb-N cast steel material can withstand high-temperature steam at 600°C to 620°C; the Cr-Mo-V cast steel material can withstand high-temperature steam below 570°C. The weld position P is selected at At the middle pressure third stage partition.

[0029] The steam inlet parameters of the medium-pressure cylinder are 5-8MPa, the reheating temperature is 600°C-620°C, the medium-pressure exhaust steam temperature is 290°C-320°C, and the medium-pressure exhaust steam pressure is 0.5-0.8MPa; the medium-pressure valve 10 Arranged on the running platform on both sides of the cyl...

Embodiment 2

[0034] Such as Figure 8 , Figure 9 The structure of the double-split intermediate pressure cylinder shown in the figure, this single-layer welded intermediate pressure cylinder structure is composed of W-V-Nb-N cast steel material in the high temperature zone 6 of the intermediate pressure cylinder in the middle and Cr-Nb in the low temperature zone 7 of the intermediate pressure cylinder on both sides. Mo-V cast steel materials are welded separately. The W-V-Nb-N cast steel material can withstand high-temperature steam at 600°C to 620°C; the Cr-Mo-V cast steel material can withstand high-temperature steam below 570°C. The seam position P is selected at the middle pressure third stage partition.

[0035] The steam inlet parameters of the medium-pressure cylinder are 5-8MPa, the reheating temperature is 600°C-620°C, the medium-pressure exhaust steam temperature is 290°C-320°C, and the medium-pressure exhaust steam pressure is 0.5-0.8MPa; the medium-pressure valve 10 Arrange...

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Abstract

The invention discloses a medium-pressure single-layer welded cylinder structure of a steam turbine, which is characterized in that it comprises a medium-pressure single-layer cylinder and a baffle; Welded, the partition is directly installed in the single-layer cylinder. By adopting a single-layer cylinder structure, the hidden danger of shaft seal extraction steam leakage at the sealing ring of the inlet pipe and the positioning shoulder of the partition sleeve can be effectively solved, and the efficiency of the unit can be improved.

Description

technical field [0001] The invention relates to a steam turbine medium-pressure cylinder, in particular to a steam turbine medium-pressure single-layer welded cylinder structure. Background technique [0002] At present, most of the high-power supercritical and ultra-supercritical steam turbine units put into operation in the market adopt the one-time reheating method, that is, the main steam from the boiler enters the reheater after doing work in the high-pressure cylinder, and the reheated steam enters the medium-pressure The cylinder continues to work, and the whole steam turbine unit is divided into three parts: high pressure cylinder, medium pressure cylinder and low pressure cylinder. [0003] Such as Figure 1 to Figure 6 As shown, for high and medium pressure split-cylinder units, the traditional medium pressure module is composed of a two-layer structure of medium pressure outer cylinder 1 and medium pressure inner cylinder 2 (or medium pressure inner cylinder 2 + p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01D25/24F01D11/00
CPCF01D11/00F01D25/24
Inventor 方宇孙奇王建伟杨晓燕黄果赵卫军高展羽刘雄莫一波黄柳燕高进
Owner DONGFANG TURBINE CO LTD
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