CN106761973B - Pressure single layer welds cylinder structure in a kind of steam turbine - Google Patents
Pressure single layer welds cylinder structure in a kind of steam turbine Download PDFInfo
- Publication number
- CN106761973B CN106761973B CN201611195921.3A CN201611195921A CN106761973B CN 106761973 B CN106761973 B CN 106761973B CN 201611195921 A CN201611195921 A CN 201611195921A CN 106761973 B CN106761973 B CN 106761973B
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- Prior art keywords
- pressure
- cast steel
- steam
- shell casing
- cylinder
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/24—Casings; Casing parts, e.g. diaphragms, casing fastenings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
Abstract
The invention discloses press single layer to weld cylinder structure in a kind of steam turbine, it is characterised in that: including middle pressure single-shell casing and partition；By being welded into vapour high-temperature area cast steel material and low-temperature region cast steel material, the partition is directly installed in single-shell casing medium pressure single-shell casing.It by using single layer cylinder structure, can effectively solve at steam inlet pipe sealing ring and diaphragm housing ring positioning omoplate that there are the hidden danger of axle envelope steam extraction leakage, improve unit efficiency.
Description
Technical field
The present invention relates to steam turbine intermediate cylinder, single layer is pressed to weld cylinder structure in specifically a kind of steam turbine.
Background technique
Currently, high-power overcritical, the supercritical turbine unit of the overwhelming majority to put into operation in the market is all made of once again
Hot mode, i.e., the main steam come out from boiler enter reheater after high pressure cylinder does work, and reheated steam enters intermediate pressure cylinder continuation
Acting, and entire steam-turbine unit is divided into high pressure cylinder, intermediate pressure cylinder and low pressure (LP) cylinder three parts.
As shown in Figures 1 to 6, divide cylinder unit for high pressure, traditional middle die block is by middle pressure outer shell 1 and IP inner casing
2(or IP inner casing 2+ diaphragm housing ring 3) two layers of cylinder structure composition；Middle pressure third section steam extraction between IP inner casing 2 and outer shell 1 by pressing from both sides
Middle pressure third section steam extraction chamber 8 that layer is constituted and extract, the 4th section of steam extraction of middle pressure is by between diaphragm housing ring 3 and middle pressure outer shell 1
It positions the 4th section of steam extraction chamber 9 of middle pressure of omoplate isolation and extracts out.Since reheat steam temperature is up to 600 DEG C~620 DEG C, middle pressure
2 material of inner casing generallys use the excellent W-V-Nb-N cast steel material of high-temperature behavior, this material price it is expensive even from foreign countries into
Mouthful；Steam is after 3 grades of actings, and temperature drops to 520 DEG C or so, and middle pressure outer shell 1 and 3 material of diaphragm housing ring usually select highest to make
Cr-Mo-V cast steel material with temperature at 550 DEG C~570 DEG C.
Since middle 4 one end of pressure inlet sleeve is on IP inner casing 2, the other end protrudes into middle pressure outer shell 1 and adopts between each other
With 5 sealing structure of sealing ring, reheated steam passes through outer shell in sealing ring 5 clearance leakage to middle pressure along reheated steam flow direction V
1, between 2 in interlayer, steam flow direction V is revealedL；The 4th section of steam extraction chamber 9 of middle pressure is by between diaphragm housing ring 3 and middle pressure outer shell 1
Two at positioning omoplate be sealed to form；Since positioning omoplate two sides have 100 DEG C or so of temperature difference, unit is easily made when running
At the deformation of positioning omoplate, cause third section steam extraction steam to leaking at the 4th section of steam extraction and the 4th section of steam extraction steam is to middle row
Leakage, influences the economy of unit.
Summary of the invention
The purpose of the present invention is to solve above-mentioned technical problem, pressure single layer welding cylinder knot in a kind of steam turbine is provided
Structure can effectively solve at steam inlet pipe sealing ring and diaphragm housing ring positioning omoplate that there are axle envelope steam extractions by using single layer cylinder structure
The hidden danger of leakage improves unit efficiency.
It realizes the technical scheme is that pressing single layer to weld cylinder structure in a kind of steam turbine, it is characterised in that: including
Middle pressure single-shell casing and partition；Medium pressure single-shell casing by being welded into vapour high-temperature area cast steel material and low-temperature region cast steel material and
At the partition is directly installed in single-shell casing.
The high-temperature area cast steel material of medium pressure single-shell casing and low-temperature region cast steel material welding position are in middle pressure third
At grade partition omoplate.
Medium pressure single-shell casing is upper and lower half structure, and an air intake, institute is respectively arranged in medium pressure single-shell casing upper and lower half
Stating high-temperature area cast steel material is W-V-Nb-N cast steel, and low-temperature region cast steel material is Cr-Mo-V cast steel.
Middle pressure valve is installed outside medium pressure single-shell casing, medium pressure valve is located at cylinder two sides and valve export is direct
It is bolted on cylinder.
SW with outside ring is set between medium pressure valve and middle pressure single-shell casing.
Medium pressure third section, the 4th section of steam extraction chamber use variable section structure pattern.
The invention has the following advantages:
1, the present invention uses single layer cylinder structure, can effectively solve to exist at steam inlet pipe sealing ring and diaphragm housing ring positioning omoplate
The hidden danger of steam leakage, improves unit efficiency；
2, it is welded, meets respective by using high-temperature area W-V-Nb-N cast steel material and Cr-Mo-V cast steel material
Material requirement at different temperatures, solves the problems, such as that monoblock cast is expensive；
3, intermediate pressure cylinder third section, the 4th section of steam extraction chamber design are variable section structure, and reducing steam extraction chamber influences steam flow；
4, valve is directly on cylinder；Horizontal tangential reduces trunking loss, improves uniform into steam flow field steam flow into vapour
Property.
Detailed description of the invention
Fig. 1 is that the Dan Liuzhong of the prior art presses through-flow schematic diagram；
Fig. 2 is the I enlarged drawing of Fig. 1；
Fig. 3 is the II enlarged drawing of Fig. 1；
Fig. 4 be the prior art double fluid in press schematic diagram；
Fig. 5 is to be pressed into steam packing seal ring structure schematic diagram in the prior art；
Fig. 6 is the III enlarged drawing of Fig. 5；
The Dan Liuzhong of Fig. 7 embodiment of the present invention presses through-flow schematic diagram；
Through-flow schematic diagram is pressed in the double split flow of Fig. 8 embodiment of the present invention；
Fig. 9 valve arrangement structural schematic diagram of the present invention；
Figure label: 1-middle pressure outer shell, 2-IP inner casings, 3-middle pressure diaphragm housing rings, 4-middle pressure inlet sleeves, 5-is close
Seal ring, 6-intermediate pressure cylinder high-temperature areas, 7-intermediate pressure cylinder low-temperature regions, 8-middle pressure third section steam extraction chambers, 9-middle the 4th section of pressures
Steam extraction chamber, 10-Middle pressure valves, 11-horizontal flanges connect bolt, and 12-horizontal flanges are inverted connection bolt, P-weldering
Stitch position, V-reheated steam flow direction, VL- leakage steam flow direction.
Specific embodiment
Embodiment 1
Such as Fig. 7, single stream intermediate pressure cylinder structure shown in Fig. 9, this single layer welds intermediate pressure cylinder structural shape by intermediate pressure cylinder high-temperature region
The W-V-Nb-N cast steel material in domain 6 is respectively welded with the Cr-Mo-V cast steel material of intermediate pressure cylinder low-temperature region 7, the W-V-
Nb-N cast steel material can bear 600 DEG C~620 DEG C high-temperature steams；The Cr-Mo-V cast steel material is able to bear 570 DEG C or less high
Warm steam, position while welding P are selected at middle pressure third level partition.
Medium pressure cylinder steam inlet condition is 5~8MPa, and reheat temperature is 600 DEG C~620 DEG C, and middle pressure stripping temperature is 290
DEG C~320 DEG C, middle pressure steam pressure is 0.5~0.8MPa；Middle pressure valve 10 is arranged on the operation platform of cylinder two sides, and valve goes out
Mouth is directly bolted with intermediate pressure cylinder, using horizontal tangential steam admission mode.
Medium pressure cylinder third section, the 4th section of steam extraction chamber 8,9 use variable section structure pattern, at extraction steam pipe nozzle
It for area of section maximum and is 1.5~2 times of extraction steam pipe nozzle areas of section；The area of section farthest apart from extraction steam pipe nozzle is minimum
It and is 0.4~0.6 times of extraction steam pipe nozzle area of section；Maximum cross-section gradually smoothly transits with smallest cross-sectional；Vapour is pressed into
Locate axle envelope and 3 sections of axle envelope steam extractions are set, 2 sections of axle envelope steam extractions are set at middle pressure vapour.
Medium pressure cylinder is divided into upper and lower half structure, uses horizontal flange to connect 11 connection type of bolt at split, leans on
Certain side bolt at vapour is pressed into close uses horizontal flange to be inverted connection 12 mode of bolt；Entire intermediate pressure cylinder passes through on lower half cylinder
4 ram's horns ride on bearing housing.SW with outside ring is set between medium pressure valve 10 and middle pressure single-shell casing, guarantees remaining valve
It completely attaches between door, intermediate pressure cylinder and plays sealing function, prevent reheated steam from revealing.
Medium pressure into insulation layer thickness at vapour at 320mm~350mm, middle pressure vapour insulation layer thickness be 230mm~
250mm, insulation layer thickness successively decrease step by step.
Embodiment 2
Double split flow intermediate pressure cylinder structure as shown in Figure 8, Figure 9, this single layer weld intermediate pressure cylinder structural shape by centre into vapour
The W-V-Nb-N cast steel material of cylinder pressure high-temperature area 6 and the Cr-Mo-V cast steel material of two sides intermediate pressure cylinder low-temperature region 7 are respectively welded
It forms, the W-V-Nb-N cast steel material can bear 600 DEG C~620 DEG C high-temperature steams；The Cr-Mo-V cast steel material can be held
By 570 DEG C or less high-temperature steams, position while welding P is selected at middle pressure third level partition.
Medium pressure cylinder steam inlet condition is 5~8MPa, and reheat temperature is 600 DEG C~620 DEG C, and middle pressure stripping temperature is 290
DEG C~320 DEG C, middle pressure steam pressure is 0.5~0.8MPa；Middle pressure valve 10 is arranged on the operation platform of cylinder two sides, and valve goes out
Mouth is directly bolted with intermediate pressure cylinder, using horizontal tangential steam admission mode.
Medium pressure cylinder third section, the 4th section of steam extraction chamber 8,9 use variable section structure pattern, at extraction steam pipe nozzle
It for area of section maximum and is 1.5~2 times of extraction steam pipe nozzle areas of section；The area of section farthest apart from extraction steam pipe nozzle is minimum
It and is 0.4~0.6 times of extraction steam pipe nozzle area of section；Maximum cross-section gradually smoothly transits with smallest cross-sectional；Pressure vapour in two sides
Place's 2 sections of axle envelope steam extractions of setting.
Medium pressure cylinder is divided into upper and lower half structure, uses horizontal flange to connect 11 connection type of bolt at split, leans on
Certain side bolt at vapour is pressed into close uses horizontal flange to be inverted connection 12 connection type of bolt；Entire intermediate pressure cylinder passes through lower half
4 ram's horns ride on bearing housing on cylinder.SW with outside ring is set between medium pressure valve 10 and middle pressure single-shell casing, guarantees it
It is completely attached between remaining valve, intermediate pressure cylinder and plays sealing function, prevent reheated steam from revealing.
Medium pressure into insulation layer thickness at vapour at 320mm~350mm, middle pressure vapour insulation layer thickness be 230mm~
250mm successively decreases step by step from high-temperature area to low-temperature region insulation layer thickness.
Use above specific case is illustrated the present invention, is merely used to help understand the present invention, not to limit
The system present invention.For those skilled in the art, according to the thought of the present invention, can also make several simple
It deduces, deform or replaces.
Claims (7)
1. pressing single layer to weld cylinder structure in a kind of steam turbine, it is characterised in that: including middle pressure single-shell casing and partition；Medium pressure
Single-shell casing is divided into intermediate pressure cylinder high-temperature area and intermediate pressure cylinder low-temperature region, by intermediate pressure cylinder high-temperature area into vapour high-temperature area cast steel material
Expect to be welded with the low-temperature region cast steel material of intermediate pressure cylinder low-temperature region；The partition is directly installed in single-shell casing；In described
Middle pressure third section, the 4th section of steam extraction chamber are wrapped to form inside the middle pressure single-shell casing of cylinder pressure low-temperature region.
2. pressing single layer to weld cylinder structure in steam turbine according to claim 1, it is characterised in that: medium pressure single-shell casing
High-temperature area cast steel material and low-temperature region cast steel material welding position are at middle pressure third level partition omoplate.
3. pressing single layer to weld cylinder structure in steam turbine according to claim 1, it is characterised in that: medium pressure single-shell casing is
An air intake, horizontal tangential steam admission mode is respectively arranged in upper and lower half structure, medium pressure single-shell casing upper and lower half.
4. pressing single layer to weld cylinder structure in steam turbine according to claim 1, it is characterised in that: the high-temperature area cast steel
Material is W-V-Nb-N cast steel, and low-temperature region cast steel material is Cr-Mo-V cast steel.
5. pressing single layer to weld cylinder structure in steam turbine according to claim 1, it is characterised in that: outside medium pressure single-shell casing
Middle pressure valve is installed, medium pressure valve is located at cylinder two sides and valve export is directly bolted on cylinder.
6. pressing single layer to weld cylinder structure in steam turbine according to claim 5, it is characterised in that: medium pressure valve is in
SW with outside ring is set between pressure single-shell casing.
7. pressing single layer to weld cylinder structure in steam turbine according to claim 1, it is characterised in that: medium pressure third section,
4th section of steam extraction chamber uses variable section structure pattern.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611195921.3A CN106761973B (en) | 2016-12-22 | 2016-12-22 | Pressure single layer welds cylinder structure in a kind of steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611195921.3A CN106761973B (en) | 2016-12-22 | 2016-12-22 | Pressure single layer welds cylinder structure in a kind of steam turbine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106761973A CN106761973A (en) | 2017-05-31 |
| CN106761973B true CN106761973B (en) | 2019-06-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201611195921.3A Active CN106761973B (en) | 2016-12-22 | 2016-12-22 | Pressure single layer welds cylinder structure in a kind of steam turbine |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58211507A (en) * | 1982-06-02 | 1983-12-09 | Hitachi Ltd | Turbine casing |
| JPH05149106A (en) * | 1991-11-27 | 1993-06-15 | Mitsubishi Heavy Ind Ltd | Steam turbine chamber |
| JP3990065B2 (en) * | 1999-03-29 | 2007-10-10 | 株式会社東芝 | Steam turbine equipment |
| JP2001221012A (en) * | 2000-02-10 | 2001-08-17 | Toshiba Corp | Steam turbine and generation equipment |
| CN201671660U (en) * | 2010-05-06 | 2010-12-15 | 中国长江动力公司(集团) | Steam turbine with steam extraction being changed into back pressure type |
| CN104963728B (en) * | 2015-06-25 | 2017-07-07 | 北京全三维能源科技股份有限公司 | A kind of superhigh pressure impact steam turbine |
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2016
- 2016-12-22 CN CN201611195921.3A patent/CN106761973B/en active Active
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| CN106761973A (en) | 2017-05-31 |
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