CN102059503A - Air leakage repairing method for casing split of steam turbine set - Google Patents
Air leakage repairing method for casing split of steam turbine set Download PDFInfo
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- CN102059503A CN102059503A CN2010105305686A CN201010530568A CN102059503A CN 102059503 A CN102059503 A CN 102059503A CN 2010105305686 A CN2010105305686 A CN 2010105305686A CN 201010530568 A CN201010530568 A CN 201010530568A CN 102059503 A CN102059503 A CN 102059503A
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Abstract
The invention relates to an air leakage repairing method for a casing split of a steam turbine set. For years, an excessive repairing method is adopted to handle the standing problem of air leakage of the casing split, such as coating/plating, spray welding, cushioning, welding up, scraping, going back to a factory for processing and the like, and the method has high cost and long period. The method provided by the invention comprises the following steps: (1) disassembling a cylinder, uncovering an upper cylinder of a steam turbine, measuring a through-flow gap in a free state and recording in details, cleaning the disassembled cylinder to remove the split combination, searching for the leakage part, measuring and recording the flatness of the cylinder flange face with a gradienter, closing the cylinder in a free state, measuring the gap of a sealing surface and determining a repairing area and a repairing amount; (2) determining a zero-point area of the gap of the sealing surface, welding a 20 mm broadband at the inner side of the flange of the air leakage area, and welding a 10 mm broadband at the outer side by taking the zero-point area as a reference point; and (3) roughly grinding after the welding, and performing coloring, flaw detection and inspection. The air leakage repairing method provided by the invention is used for repairing air leakage of the casing split of the steam turbine set.
Description
Technical field:
The present invention relates to a kind of Steam Turbine casing split gas leakage restorative procedure.
Background technology:
The cylinder of steam turbine is everlasting and is worked under HTHP (530 ℃, the 90ata) condition.Also be connected with admission, steam discharge and regenerative steam pipeline at casing outer wall, require cylinder should have enough strength and stiffness, not only to bear the deadweight of each part and the installation pulling force of pipeline, and the thermal stress that produces of the cylinder inside and outside differential pressure will bear work time the, the temperature difference, and steam when flowing out stator blade to the reaction force of stator part and the active force of the hot state countercylinder of various connecting pipe.This shows and guarantee that cylinder part stable operation is particularly important.
Find in the actual motion for many years that in power plant internal expanding mouth, cylinder arch problem on deformation easily take place unit high-pressure cylinder velocity-compounded stage, cause split seriously to leak vapour.Safety, the economical operation of unit have been influenced greatly.
Mainly there are the reason of design aspect and the reason of operation aspect:
One, design reasons:
1, small-sized unit individual layer cylinder structure.In unit starting, shutdown and varying duty because the vapor (steam) temperature difference of each several part in the cylinder, make casing wall radially, axially and on and the temperature difference appears between lower cylinder body, thereby produce thermal stress and thermal deformation.The horizontal flange width of high pressure cylinder is 4～5 times of cylinder wall thickness, and flange is in unidirectional heated condition in the start-up course, has the big temperature difference and thermal stress between internal and external walls and flange and the casing wall, causes the thermal deformation that the casing split flange rises mouthful and leaks vapour.
2, bolt position on flange face is unreasonable, and quantity is few, the interval is excessive, and bolt pretightening can not fit the casing split flange.
Two, operation reason:
1, second temperature difference is big on the cylinder, and because of lower cylinder half is connected with drain water piping with drawing gas, area of dissipation is big and be unfavorable for insulation.Low top, firing floor temperature bottom height in the machine room, following cylinder makes down the cylinder metal temperature always be lower than the metal temperature of upper cylinder half usually than the easy heat radiation of upper cylinder half, causes doming effect on the cylinder, and make down cylinder bottom portion radially dynamic and static gaps reduce, even bump the mill phenomenon.Therefore, take to improve thickening down the cylinder heat-insulation layer, install baffle plate below the cylinder down, guarantee drain water piping hydrophobic unimpeded, avoid measure such as ponding and control temperature rise speed in the cylinder, can obviously reduce the temperature difference that goes up lower cylinder body.
When 2, merging on the cylinder lower cylinder body, bolt does not often reach the requirement of tight angle of heat and radian when installing, and bolt pretension understrressing, can not make the lower flange faying face reach tight contact, causes leaking vapour.
3, bolt generation stress relaxation phenomenon is promptly behind the long-play: bolt produces strain under the pretightning force effect reduces, and plastic deformation increases, and again under the bolt situation that in time more renews, the part can take place rise mouthful and leak vapour.
Along with high parameter, high power turbine unit constantly develop, in recent years the unit of producing, the measure that its high-pressure cylinder flange is structurally mainly taked is to increase the flange height and reduce width, reducing the diameter of bolt accelerates, and make the bolt center line close as far as possible to the intersection point of the prolongation camber line of cylinder wall thickness center line and split, with rigidity and the sealing of improving flange.But, for operating medium and small unit cylinder, if its expense height of new high pressure cylinder, cycle of change optimal design long, influence economy of power plant benefit etc., still to repair use.
For many years, handle casing split leakage vapour hard nut to crack and adopt too much restorative procedure, as: coating, surfacing, cushioning, soldering, scraping, time factory's processing etc., not only cost height but also cycle are long.
Summary of the invention:
The objective of the invention is provides a kind of Steam Turbine casing split gas leakage restorative procedure at the problem of above-mentioned existence, and this method is simple, and the cycle is short, and expense is low.Actual effect is obvious, even after leaking the serious cylinder reparation of vapour, also can keep two overhaul phases.
Above-mentioned purpose realizes by following technical scheme:
Steam Turbine casing split gas leakage restorative procedure, this method comprises the steps:
(1) takes cylinder apart, open the steam turbine upper cylinder half, measure through-flow gap under the free state and make detail record, the split bond is removed in cleaning after tearing cylinder open, search leak site, with level meter surveying record cylinder flange facial plane degree, free state is closed cylinder, measure the sealing surface gap and determine restoring area, and the reparation amount;
(2) determine the zone at zero point in sealing surface gap, with this as datum mark, in the inboard welding of the flange that leaks vapour zone 20mm broadband, welding 10mm broadband, the outside;
(3) welding back corase grind, and dye penetration inspection.
Described Steam Turbine casing split gas leakage restorative procedure, the A507 welding rod is adopted in the welding described in the step (2), and temperature between key-course≤60 ℃ during welding take 2 welders to be symmetrically welded, reverse segmentation welder skill.
Described Steam Turbine casing split gas leakage restorative procedure, roughly grind after the welding described in the step (3), and dye penetration inspection is smeared red lead powder after being meant welding, employing is to the method for grinding, repeatedly merge empty cylinder body, remove minute faying face in the scraping of high point, to dividing faying face in grinding, reach welding region and just establish zero point on same horizontal plane, last lower cylinder body junction fully contacts, pneumatic grinding wheel is adopted in scraping, from the maximum position of scraping amount, to enlarging all around, every reconditioning once vertically reaches laterally to grinding at faying face with leveling ruler, check the contact situation, and detect cylinder horizontal integration face and Boring mill perpendicularity at any time to faying face, prevent to repair partially, detain empty cylinder when the amount of scraping remains 0.10-0.15mm when repairing, cold tight 1/3 bolt is checked the faying face gap, repeatedly to cold tight 1/3 bolt of high pressure outer shell, measure and check, carry out essence and scrape, till 0.05mm, finally under free state, lower cylinder body in the merging, reaching sealing surface restoring area gap width is 0.05mm, the 0.03mm degree of depth is less than 20mm, after tighting a bolt, measure the faying face gap, check whether the split warping phenomenon takes place, behind the flow passage component of packing into, tight a bolt according to tight radian of bolt heat and angle, fully guarantee seal clearance.
Beneficial effect:
1. the present invention promptly saves cost, time, can thoroughly eliminate Lou vapour phenomenon again.Power plant often leaks gas by forced-stopping machine because of cylinder, not only influences unit safety stable operation, because of reducing generated energy, causes very large economy loss, has had a strong impact on the economic benefit of power plant.The way that whole scraping is repaired to split is all adopted in split gas leakage maintenance in the past, and repair surface is big, and the big workman's technical merit height that requires of technical difficulty, is repaired back work a period of time also can leak gas at repairing efficiency long minimum 20 days of repair time; Repair surface of the present invention is little, and the workman is easy and simple to handle, and repair time is short, and maximum 15 days of repairing efficiency is thoroughly removed a hidden danger after the reparation, guarantees unit safety stable operation, can bring considerable economic to power plant.With the 30MW unit is ten thousand kilowatts/hour of example: 300MW=30, and power plant sells 0.25 yuan/kw.h of electricity price, moves one day unit economic benefit: 30 * 10
4* 24 * 0.25=180 ten thousand.Because thoroughly remove a hidden danger after weak point and the reparation and guarantee that unit can normally move repair time, the loss of shutting down in the middle of can reducing can bring remarkable economic efficiency to power plant.
Description of drawings:
Accompanying drawing 1 is the structural representation of the welded flange of invention, and 1 is outside built-up welding band among the figure, and 2 is the flange split, and 3 is inboard built-up welding band, and 4 is bolt hole.
The specific embodiment:
Embodiment 1:
Steam Turbine casing split gas leakage restorative procedure, this method comprises the steps:
(1) take cylinder apart, open the steam turbine upper cylinder half, check that composition surface coating and cylinder face matrix wash away situation, the place that record and mark steam flow wash away vestige and red rust staining is arranged is paid special attention to penetrability and is washed away vestige, clearly has leakage position.Measure through-flow gap under the free state and make detail record, tear cylinder open after cleaning remove the split bond, with level meter surveying record cylinder flange facial plane degree, free state is closed cylinder, measures the sealing surface gap and determines restoring area, and the reparation amount;
(2) determine the zone at zero point in sealing surface gap, as datum mark, adopt A507 (Cr25Ni20Mo6) welding rod, in the inboard welding of the flange that leaks vapour zone 20mm broadband, welding 10mm broadband, the outside with this.See shown in Figure 1: 1 outside built-up welding band among the figure, 2 flange splits, 3 inboard built-up welding bands, 4 bolts hole.
(3) welding back corase grind, and dye penetration inspection.
Described Steam Turbine casing split gas leakage restorative procedure, the A507 welding rod is adopted in the welding described in the step (2), and temperature between key-course≤60 ℃ during welding take 2 welders to be symmetrically welded, reverse segmentation welder skill.Terminal and the middle minute faying face rounding off of welding uses φ 3.2 welding rods, and welding current is stopped " undercut " phenomenon and taken place between 110-120A.
Described Steam Turbine casing split gas leakage restorative procedure, roughly grind after the welding described in the step (3), and dye penetration inspection is smeared red lead powder after being meant welding, employing is to the method for grinding, repeatedly merge empty cylinder body, remove minute faying face in the scraping of high point, to dividing faying face in grinding, reach welding region and just establish zero point on same horizontal plane, last lower cylinder body junction fully contacts, pneumatic grinding wheel is adopted in scraping, from the maximum position of scraping amount, to enlarging all around, every reconditioning once vertically reaches laterally to grinding at faying face with leveling ruler, check the contact situation, and detect cylinder horizontal integration face and Boring mill perpendicularity at any time to faying face, prevent to repair partially, detain empty cylinder when the amount of scraping remains 0.10-0.15mm when repairing, cold tight 1/3 bolt is checked the faying face gap, repeatedly to cold tight 1/3 bolt of high pressure outer shell, measure and check, carry out essence and scrape, till 0.05mm, finally under free state, lower cylinder body in the merging, reaching sealing surface restoring area gap width is 0.05mm, the 0.03mm degree of depth is less than 20mm, after tighting a bolt, measure the faying face gap, check whether the split warping phenomenon takes place, behind the flow passage component of packing into, tight a bolt according to tight radian of bolt heat and angle, fully guarantee seal clearance.
Claims (3)
1. Steam Turbine casing split gas leakage restorative procedure, it is characterized in that: this method comprises the steps:
(1) takes cylinder apart, open the steam turbine upper cylinder half, measure through-flow gap under the free state and make detail record, the split bond is removed in cleaning after tearing cylinder open, search leak site, with level meter surveying record cylinder flange facial plane degree, free state is closed cylinder, measure the sealing surface gap and determine restoring area, and the reparation amount;
(2) determine the zone at zero point in sealing surface gap, with this as datum mark, in the inboard welding of the flange that leaks vapour zone 20mm broadband, welding 10mm broadband, the outside;
(3) welding back corase grind, and dye penetration inspection.
2. Steam Turbine casing split according to claim 1 gas leakage restorative procedure, it is characterized in that: the A507 welding rod is adopted in the welding described in the step (2), and temperature between key-course≤60 ℃ during welding take 2 welders to be symmetrically welded, reverse segmentation welder skill.
3. Steam Turbine casing split gas leakage restorative procedure according to claim 1 and 2, it is characterized in that: roughly grind after the welding described in the step (3), and dye penetration inspection is smeared red lead powder after being meant welding, employing is to the method for grinding, repeatedly merge empty cylinder body, remove minute faying face in the scraping of high point, to dividing faying face in grinding, reach welding region and just establish zero point on same horizontal plane, last lower cylinder body junction fully contacts, pneumatic grinding wheel is adopted in scraping, from the maximum position of scraping amount, to enlarging all around, every reconditioning once vertically reaches laterally to grinding at faying face with leveling ruler, check the contact situation, and detect cylinder horizontal integration face and Boring mill perpendicularity at any time to faying face, prevent to repair partially, detain empty cylinder when the amount of scraping remains 0.10-0.15mm when repairing, cold tight 1/3 bolt is checked the faying face gap, repeatedly to cold tight 1/3 bolt of high pressure outer shell, measure and check, carry out essence and scrape, till 0.05mm, finally under free state, lower cylinder body in the merging, reaching sealing surface restoring area gap width is 0.05mm, the 0.03mm degree of depth is less than 20mm, after tighting a bolt, measure the faying face gap, check whether the split warping phenomenon takes place, behind the flow passage component of packing into, tight a bolt according to tight radian of bolt heat and angle, fully guarantee seal clearance.
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| CN2010105305686A CN102059503A (en) | 2010-11-04 | 2010-11-04 | Air leakage repairing method for casing split of steam turbine set |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102303205A (en) * | 2011-09-05 | 2012-01-04 | 广州市天河区金棠表面工程技术有限公司 | Split deformation or deflation field spraying repair process for steam turbine cylinder |
| CN104874973A (en) * | 2014-02-28 | 2015-09-02 | 中电华元核电工程技术有限公司 | Steam turbine cylinder joint surface deformation processing method |
| CN105269242A (en) * | 2015-11-20 | 2016-01-27 | 湖南省湘衡盐化有限责任公司 | Method for repairing air leakage of turbine air cylinders |
| CN105345390A (en) * | 2015-12-10 | 2016-02-24 | 东方电气集团东方汽轮机有限公司 | Repairing method for split sealing surface of pressure resistant vessel |
| CN110421342A (en) * | 2019-07-12 | 2019-11-08 | 中广核核电运营有限公司 | The cold clamping method of bolt on half speed unit high intermediate pressure cylinder split |
| CN110936098A (en) * | 2019-11-07 | 2020-03-31 | 江苏特维克科技有限公司 | High-medium pressure cylinder body split surface defect repairing process |
| CN114412590A (en) * | 2021-12-01 | 2022-04-29 | 上海发电设备成套设计研究院有限责任公司 | Online safety monitoring method for flange bisection tightness of nuclear turbine cylinder |
| CN114412591A (en) * | 2021-12-01 | 2022-04-29 | 上海发电设备成套设计研究院有限责任公司 | Multi-dimensional safety monitoring method and device for nuclear turbine, electronic equipment and storage medium |
| US11725534B2 (en) | 2021-12-01 | 2023-08-15 | Shanghai Power Equipment Research Institute Co., Ltd | Method of multi-objective and multi-dimensional online joint monitoring for nuclear turbine |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102303205A (en) * | 2011-09-05 | 2012-01-04 | 广州市天河区金棠表面工程技术有限公司 | Split deformation or deflation field spraying repair process for steam turbine cylinder |
| CN102303205B (en) * | 2011-09-05 | 2013-06-26 | 广州市天河区金棠表面工程技术有限公司 | Split deformation or deflation field spraying repair process for steam turbine cylinder |
| CN104874973A (en) * | 2014-02-28 | 2015-09-02 | 中电华元核电工程技术有限公司 | Steam turbine cylinder joint surface deformation processing method |
| CN104874973B (en) * | 2014-02-28 | 2017-09-12 | 中电华元核电工程技术有限公司 | A kind of steam turbine deformation of joint surface processing method |
| CN105269242A (en) * | 2015-11-20 | 2016-01-27 | 湖南省湘衡盐化有限责任公司 | Method for repairing air leakage of turbine air cylinders |
| CN105345390A (en) * | 2015-12-10 | 2016-02-24 | 东方电气集团东方汽轮机有限公司 | Repairing method for split sealing surface of pressure resistant vessel |
| CN105345390B (en) * | 2015-12-10 | 2018-10-16 | 东方电气集团东方汽轮机有限公司 | Point sealing surface repair method in pressure resistant vessel |
| CN110421342A (en) * | 2019-07-12 | 2019-11-08 | 中广核核电运营有限公司 | The cold clamping method of bolt on half speed unit high intermediate pressure cylinder split |
| CN110936098A (en) * | 2019-11-07 | 2020-03-31 | 江苏特维克科技有限公司 | High-medium pressure cylinder body split surface defect repairing process |
| CN114412590A (en) * | 2021-12-01 | 2022-04-29 | 上海发电设备成套设计研究院有限责任公司 | Online safety monitoring method for flange bisection tightness of nuclear turbine cylinder |
| CN114412591A (en) * | 2021-12-01 | 2022-04-29 | 上海发电设备成套设计研究院有限责任公司 | Multi-dimensional safety monitoring method and device for nuclear turbine, electronic equipment and storage medium |
| US11725534B2 (en) | 2021-12-01 | 2023-08-15 | Shanghai Power Equipment Research Institute Co., Ltd | Method of multi-objective and multi-dimensional online joint monitoring for nuclear turbine |
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Application publication date: 20110518 |