CN104819017B - A kind of encapsulating method of novel mesolow cylinder split - Google Patents
A kind of encapsulating method of novel mesolow cylinder split Download PDFInfo
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- CN104819017B CN104819017B CN201510102381.9A CN201510102381A CN104819017B CN 104819017 B CN104819017 B CN 104819017B CN 201510102381 A CN201510102381 A CN 201510102381A CN 104819017 B CN104819017 B CN 104819017B
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Abstract
The encapsulating method of a kind of novel mesolow cylinder split of the present invention relates to a kind of throttle (steam) temperature and is up to 600 DEG C, and initial steam pressure is up to the encapsulating method of the split of the high temperature air chamber of the mesolow cylinder of 2MPa；Present invention may also apply to the sealing of the split of low-pressure internal cylinder.Including the top half of high temperature air chamber of mesolow cylinder, the latter half of high temperature air chamber of mesolow cylinder, location sealing bar, a upper arm is paid in pincerlike clamping, underarm, fishbolt A, fishbolt B, a diplopore check washer are paid in pincerlike clamping；The thermal stress of the high temperature air chamber/low-pressure internal cylinder of mesolow cylinder greatly reduces；Upper arm is paid in pincerlike clamping and the joint portion of underarm is paid in pincerlike clamping, fishbolt A, fishbolt B are in temperature lower region, and the mutually temperature difference is the least；Location sealing bar effectively solves throttle (steam) temperature and is up to 600 DEG C, and initial steam pressure is up to the high temperature air chamber/low-pressure internal cylinder of the mesolow cylinder of 2MPa within an overhaul life, tight leak-free problem.
Description
Technical field:
The encapsulating method of a kind of novel mesolow cylinder split of the present invention relates to a kind of throttle (steam) temperature and is up to 535 DEG C to 600
DEG C, initial steam pressure is up to the encapsulating method of the split of the high temperature air chamber of the mesolow cylinder of 1.5MPa to 2MPa；The present invention is also
Can be used for the sealing of the split of low-pressure internal cylinder.
Background technology:
The inner casing of the low pressure (LP) cylinder of prior art is generally made up of the welding of sheet metal parts, and split uses traditional flange, bolt
Sealing structure.The low pressure (LP) cylinder initial steam pressure of the double reheat power generation sets of prior art is usually no more than 0.5MPa throttle (steam) temperature about 350
DEG C, the low pressure (LP) cylinder initial steam pressure of single reheat unit is usually no more than 0.7MPa throttle (steam) temperature about 300 DEG C；The operating experience of power plant
Showing, even if the low-pressure internal cylinder operating pressure of prior art, temperature are the highest, unit operation is after 8 to 10 years, low-pressure internal cylinder
Split is dehisced in tending to occur, and the split of low-pressure internal cylinder tends to occur high-temperature region, middle part and dehisces in main engine axis direction, this
Two classes dehisce to cause low-pressure internal cylinder to leak vapour, and low pressure (LP) cylinder efficiency declines；Producing the reason that this two class dehisces is low-pressure internal cylinder high-temperature region
The inside and outside wall temperature difference is bigger；During the quick application of load of unit starting process and unit, flange, the bolt temperature difference are relatively big, additional heat
Stress exceedes the yield strength of bolt, and bolt heat is tired, and clamp force necessary to sealing low pressure inner casing split is gradually reduced even
Lose；The inner casing of low pressure (LP) cylinder is generally made up of the welding of sheet metal parts, and panel beating weldment has bigger residual stress, in unit starting process
During application of load quick with unit, extra heat stress makes low-pressure internal cylinder local produce plastic deformation.
If low pressure (LP) cylinder throttle (steam) temperature improves, initial steam pressure improves, and low-pressure internal cylinder leakage vapour problem can be aggravated, it more difficult to controls,
Prior art it has been generally acknowledged that low-pressure internal cylinder throttle (steam) temperature is no more than 400 DEG C.
Prior art improves the structure of low pressure (LP) cylinder, and low pressure (LP) cylinder is designed as 3 layers of cylinder structure, and internal layer is high temperature air chamber, in
Layer is low-pressure internal cylinder, and outer layer is lp outer casing, and to reducing, low-pressure internal cylinder leakage vapour is effective, but fails to be fully solved problem, particularly
Reach the mesolow cylinder of 600 DEG C in the face of initial steam pressure reaches 2MPa throttle (steam) temperature, there is no certain assurance.
Point cylinder scheme of a kind of novel secondary reheating embrittlement: ultra-high pressure cylinder, high intermediate pressure cylinder, mesolow cylinder；Double reheat steams
Vapour directly enters mesolow cylinder through double reheat combined emergency stop and governing valve, without mesolow cross over pipe.
Summary of the invention:
Technical problem to be solved:
It is an object of the invention to provide the encapsulating method of a kind of novel mesolow cylinder split, solve throttle (steam) temperature up to
535 DEG C to 600 DEG C, initial steam pressure is up to the sealing side of the split of the high temperature air chamber of the mesolow cylinder of 1.5MPa to 2MPa
Method；Present invention may also apply to the sealing of the split of low-pressure internal cylinder.
The encapsulating method finding a kind of novel mesolow cylinder split ensures that initial steam pressure reaches 2MPa throttle (steam) temperature and reaches 600 DEG C
Mesolow cylinder within an overhaul life, do not leak, become without mesolow cross over pipe mesolow cylinder technology scheme set up
Essential condition.
Solve its technical problem use technical scheme:
The encapsulating method of a kind of novel mesolow cylinder split of the present invention takes technology road diverse with prior art
Line.
The encapsulating method of a kind of novel mesolow cylinder split of the present invention includes the upper half of the high temperature air chamber of mesolow cylinder
Partly upper arm (2), pincers are paid in the latter half (6) of the high temperature air chamber of (1), mesolow cylinder, location sealing bar (5), pincerlike clamping
Clevis tightly pays underarm (7), fishbolt A (3), fishbolt B (4), diplopore check washer (8)；The high temperature of mesolow cylinder enters vapour
The top half (1) of room is furnished with narrow high flange, and the middle part of split has trapezoidal cross-section seal groove, and the top of narrow high flange has
The load groove of half circle cross section, load groove seamlessly transits with the outer wall of the top half (1) of the high temperature air chamber of mesolow cylinder, load
The bottom of groove need to be accurate to 0.01mm to the size of split；The latter half (6) of the high temperature air chamber of mesolow cylinder is furnished with narrow
High flange, the middle part of split has trapezoidal cross-section seal groove, and the bottom of narrow high flange has the load groove of half circle cross section, load
Groove seamlessly transits with the outer wall of the latter half (6) of the high temperature air chamber of mesolow cylinder, the chi of the bottom of load groove to split
Very little need are accurate to 0.01mm；Location sealing bar (5) section is double trapezoid, and material is austenitic stainless steel, rises and radially, axially positions
And sealing function；Underarm (7) is paid in pincerlike clamping can be divided into polishing head, underarm, joint portion, and the knot of underarm (7) is paid in pincerlike clamping
2 screwed holes it are tapped with in conjunction portion；Upper arm (2) is paid in pincerlike clamping can be divided into polishing head, upper arm, joint portion, and pincerlike clamping is paid
2 non-threaded through holes are had on the joint portion of arm (2)；Pincer is combined at unit cold conditions, fishbolt A (3) and fishbolt B (4)
Top half (1) and the mesolow of the high temperature air chamber of upper arm (2) and pincerlike clamping pair underarm (7) clamping mesolow cylinder is paid in clamping
The latter half (6) of the high temperature air chamber of cylinder, it is provided that initial sealing clamp force during cold conditions；Fishbolt A (3) and clamping spiral shell during cold conditions
The tension that bolt B (4) is subject to is less than the yield stress of fishbolt A (3) material and fishbolt B (4) material respectively
30%；During cold conditions, the office of the underarm of underarm (7) is paid in the most heavily stressed and pincerlike clamping in local of the upper arm that upper arm (2) is paid in pincer clamping
The most heavily stressed yield stress paying underarm (7) material respectively less than pincer clamping pair upper arm (2) material and pincerlike clamping in portion
30%；The tension being subject at main frame VWO operating mode, fishbolt A (3) and fishbolt B (4) is less than fishbolt A respectively
(3) the 80% of the yield stress of material and fishbolt B (4) material；In main frame VWO operating mode, the upper of upper arm (2) is paid in pincerlike clamping
The local of the underarm that underarm (7) is paid in the most heavily stressed and pincerlike clamping in the local of arm is the most heavily stressed pays less than pincer clamping respectively
The 80% of the yield stress of underarm (7) material is paid in arm (2) material and pincerlike clamping；A kind of sealing of novel mesolow cylinder split
Method can also be used for the sealing of the split of low-pressure internal cylinder.
Beneficial effects of the present invention:
The medial and lateral temperature difference of narrow high flange is substantially reduced compared with the medial and lateral temperature difference of prior art flange；Flange portion
Position also greatly reduces with the temperature difference at non-flange position, and the thermal stress of the high temperature air chamber/low-pressure internal cylinder of mesolow cylinder greatly reduces；
Upper arm is paid in pincerlike clamping and the joint portion of underarm is paid in pincerlike clamping, fishbolt A, fishbolt B are in temperature
Degree lower region, and the mutually temperature difference is the least, the thermal stress that fishbolt A, fishbolt B add greatly reduces；
Upper arm is paid in pincerlike clamping and pincerlike clamping is paid underarm and had bigger elastic deformability, low in can absorbing completely
High temperature air chamber/the low-pressure internal cylinder of cylinder pressure is interior without making high temperature air chamber/low-pressure internal cylinder obtain by cold conditions to hot swell increment
Wall produces plastic deformation；
There is no bolt hole on narrow high flange split, make employing location sealing bar be possibly realized, effectively solve into steam temperature
Degree up to 535 DEG C to 600 DEG C, initial steam pressure is up to the high temperature air chamber/low-pressure internal cylinder of the mesolow cylinder of 1.5MPa to 2MPa and exists
In one overhaul life, tight leak-free problem.
Accompanying drawing illustrates:
Fig. 1 is the profile of the encapsulating method of a kind of novel mesolow cylinder split.
Reference in FIG:
The top half of high temperature air chamber of 1 mesolow cylinder, 2 pincerlike clampings pay upper arm,
3 fishbolt A, 4 tight bolt B,
5 location sealing bars, 6 mesolow cylinders high temperature air chamber the latter half,
Underarm, 8 diplopore check washers are paid in 7 pincerlike clampings.
Detailed description of the invention
Vapour is entered below with the high temperature of the mesolow cylinder of the efficient ultra supercritical double reheat power generation sets of a 1200MW grade 720 DEG C
As a example by the sealing of room split, throttle (steam) temperature 600 DEG C, initial steam pressure 2MPa, in conjunction with Fig. 1, further illustrate present invention one newly
The encapsulating method of type mesolow cylinder split.
The optimal way of invention:
The encapsulating method of a kind of novel mesolow cylinder split of the present invention includes the upper half of the high temperature air chamber of mesolow cylinder
Partly upper arm (2), pincers are paid in the latter half (6) of the high temperature air chamber of (1), mesolow cylinder, location sealing bar (5), pincerlike clamping
Clevis tightly pays underarm (7), fishbolt A (3), fishbolt B (4), diplopore check washer (8)；The high temperature of mesolow cylinder enters vapour
The top half (1) of room is furnished with narrow high flange, and the middle part of split has trapezoidal cross-section seal groove, and the top of narrow high flange has
The load groove of half circle cross section, load groove seamlessly transits with the outer wall of the top half (1) of the high temperature air chamber of mesolow cylinder, load
The bottom of groove need to be accurate to 0.01mm to the size of split；The latter half (6) of the high temperature air chamber of mesolow cylinder is furnished with narrow
High flange, the middle part of split has trapezoidal cross-section seal groove, and the bottom of narrow high flange has the load groove of half circle cross section, load
Groove seamlessly transits with the outer wall of the latter half (6) of the high temperature air chamber of mesolow cylinder, the chi of the bottom of load groove to split
Very little need are accurate to 0.01mm；Location sealing bar (5) section is double trapezoid, and material is austenitic stainless steel, rises and radially, axially positions
And sealing function；Underarm (7) is paid in pincerlike clamping can be divided into polishing head, underarm, joint portion, and the knot of underarm (7) is paid in pincerlike clamping
2 screwed holes it are tapped with in conjunction portion；Upper arm (2) is paid in pincerlike clamping can be divided into polishing head, upper arm, joint portion, and pincerlike clamping is paid
2 non-threaded through holes are had on the joint portion of arm (2)；Pincer is combined at unit cold conditions, fishbolt A (3) and fishbolt B (4)
Top half (1) and the mesolow of the high temperature air chamber of upper arm (2) and pincerlike clamping pair underarm (7) clamping mesolow cylinder is paid in clamping
The latter half (6) of the high temperature air chamber of cylinder, it is provided that initial sealing clamp force during cold conditions；Fishbolt A (3) and clamping spiral shell during cold conditions
The tension that bolt B (4) is subject to is less than the yield stress of fishbolt A (3) material and fishbolt B (4) material respectively
30%；During cold conditions, the office of the underarm of underarm (7) is paid in the most heavily stressed and pincerlike clamping in local of the upper arm that upper arm (2) is paid in pincer clamping
The most heavily stressed yield stress paying underarm (7) material respectively less than pincer clamping pair upper arm (2) material and pincerlike clamping in portion
30%；The tension being subject at main frame VWO operating mode, fishbolt A (3) and fishbolt B (4) is less than fishbolt A respectively
(3) the 80% of the yield stress of material and fishbolt B (4) material；In main frame VWO operating mode, the upper of upper arm (2) is paid in pincerlike clamping
The local of the underarm that underarm (7) is paid in the most heavily stressed and pincerlike clamping in the local of arm is the most heavily stressed pays less than pincer clamping respectively
The 80% of the yield stress of underarm (7) material is paid in arm (2) material and pincerlike clamping；A kind of sealing of novel mesolow cylinder split
Method can also be used for the sealing of the split of low-pressure internal cylinder.
Location sealing bar (5) section is double trapezoid, trapezoidal long limit 12mm, trapezoidal minor face 8mm, trapezoidal high 15mm, double trapezoid
Height overall 30mm；Material is austenitic stainless steel, and 0.05mm gap is left in the trapezoidal cross-section seal groove side coordinated with it, top with
1.0mm gap is respectively left in bottom；Axially 8mm gap is left at two ends altogether；Cold-working course of processing deflection, more than 12%, need to do solid solution
Heat-transformation processes.
It is heat-resistant high-strength spring steel 30W that upper arm (2) material is paid in pincerlike clamping4Cr2VA, machines after die forging, oil quenching, adjusts
Matter heat treatment；There is high-yield strength；Polishing head section is semicircle, and its radius is the upper half of the high temperature air chamber of mesolow cylinder
Partly 0.9 times of the radius of the load groove of (1).
It is high strength thermal resistant alloy steel 34CrNi that underarm (7) material is paid in pincerlike clamping3MoW, machines after die forging, quenched heat
Process；There is high-yield strength；Polishing head section is semicircle, and its radius is the latter half of the high temperature air chamber of mesolow cylinder
(6) 0.9 times of the radius of load groove.
Fishbolt A (3) and fishbolt B (4) material are high strength thermal resistant alloy steel 34CrNi3MoW, after die forging, machine adds
Work, Tempering and Quenching；There is high-yield strength.
Diplopore check washer (8) material is austenitic stainless steel 316 L, thickness 1.5mm, in fishbolt A (3) and clamping
After bolt B (4) cold conditions is tightened to position, knuckle is locking.
Claims (6)
1. the encapsulating method of a novel mesolow cylinder split, it is characterised in that: include the high temperature air chamber of mesolow cylinder
Upper arm is paid in top half (1), the latter half (6) of high temperature air chamber of mesolow cylinder, location sealing bar (5), pincerlike clamping
(2), underarm (7), fishbolt A (3), fishbolt B (4), diplopore check washer (8) are paid in pincerlike clamping；The height of mesolow cylinder
The top half (1) of temperature air chamber is furnished with narrow high flange, and the middle part of split has trapezoidal cross-section seal groove, narrow high flange upper
Portion has the load groove of half circle cross section, and load groove is smoothed with the outer wall of the top half (1) of the high temperature air chamber of mesolow cylinder
Crossing, the size of the bottom of load groove to split need to be accurate to 0.01mm；The latter half (6) of the high temperature air chamber of mesolow cylinder
Being furnished with narrow high flange, the middle part of split has trapezoidal cross-section seal groove, and the bottom of narrow high flange has the load of half circle cross section
Groove, load groove seamlessly transits with the outer wall of the latter half (6) of the high temperature air chamber of mesolow cylinder, the bottom of load groove in point
The size in face need to be accurate to 0.01mm；Location sealing bar (5) section is double trapezoid, and material is austenitic stainless steel, plays radial direction, axle
To location and sealing function；Underarm (7) is paid in pincerlike clamping can be divided into polishing head, underarm, joint portion, and underarm is paid in pincerlike clamping
(7) 2 screwed holes it are tapped with on joint portion；Upper arm (2) is paid in pincerlike clamping can be divided into polishing head, upper arm, joint portion, pincerlike folder
2 non-threaded through holes are had on the tight joint portion paying upper arm (2)；At unit cold conditions, fishbolt A (3) and fishbolt B (4) knot
Close pincer clamping pay upper arm (2) and pincerlike clamping pay the high temperature air chamber that underarm (7) clamps mesolow cylinder top half (1) and
The latter half (6) of the high temperature air chamber of mesolow cylinder, it is provided that initial sealing clamp force during cold conditions；During cold conditions fishbolt A (3) and
The tension that fishbolt B (4) is subject to respectively should less than the surrender of fishbolt A (3) material and fishbolt B (4) material
The 30% of power；During cold conditions, the underarm of underarm (7) is paid in the most heavily stressed and pincerlike clamping in local of the upper arm that upper arm (2) is paid in pincer clamping
Local the most heavily stressed pay upper arm (2) material less than pincer clamping respectively and pincerlike clamping pay the surrender of underarm (7) material should
The 30% of power；The tension being subject at main frame VWO operating mode, fishbolt A (3) and fishbolt B (4) is less than clamping spiral shell respectively
The 80% of the yield stress of bolt A (3) material and fishbolt B (4) material；In main frame VWO operating mode, upper arm (2) is paid in pincerlike clamping
The local of the most heavily stressed and pincerlike clamping in local of the upper arm underarm of paying underarm (7) the most heavily stressed respectively less than pincer clamping
Pay upper arm (2) material and the 80% of the pincerlike yield stress clamping pair underarm (7) material；A kind of novel mesolow cylinder split
Encapsulating method can also be used for the sealing of the split of low-pressure internal cylinder.
The encapsulating method of a kind of novel mesolow cylinder split the most according to claim 1, is characterized in that described location
Sealing strip (5) section is double trapezoid, trapezoidal long limit 12mm, trapezoidal minor face 8mm, trapezoidal high 15mm, double trapezoid height overall 30mm；Material
For austenitic stainless steel, 0.05mm gap is left in the trapezoidal cross-section seal groove side coordinated with it, and top and bottom respectively leaves
1.0mm gap；Axially 8mm gap is left at two ends altogether；Cold-working course of processing deflection, more than 12%, need to do solutionizing heat treatment.
The encapsulating method of a kind of novel mesolow cylinder split the most according to claim 1, is characterized in that described pincer
It is heat-resistant high-strength spring steel 30W that upper arm (2) material is paid in clamping4Cr2VA, machines after die forging, oil quenching, Tempering and Quenching；Have
High-yield strength；Polishing head section is semicircle, and its radius is the load of the top half (1) of the high temperature air chamber of mesolow cylinder
0.9 times of the radius of groove.
The encapsulating method of a kind of novel mesolow cylinder split the most according to claim 1, is characterized in that described pincer
It is high strength thermal resistant alloy steel 34CrNi that underarm (7) material is paid in clamping3MoW, machines after die forging, Tempering and Quenching；There is height
Yield strength；Polishing head section is semicircle, and its radius is the load groove of the latter half (6) of the high temperature air chamber of mesolow cylinder
0.9 times of radius.
The encapsulating method of a kind of novel mesolow cylinder split the most according to claim 1, is characterized in that described clamping
Bolt A (3) and fishbolt B (4) material are high strength thermal resistant alloy steel 34CrNi3MoW, machines after die forging, at quenched heat
Reason；There is high-yield strength.
The encapsulating method of a kind of novel mesolow cylinder split the most according to claim 1, is characterized in that described diplopore
Check washer (8) material is austenitic stainless steel 316 L, thickness 1.5mm, in fishbolt A (3) and fishbolt B (4) cold conditions
After being tightened to position, knuckle is locking.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510102381.9A CN104819017B (en) | 2015-03-09 | 2015-03-09 | A kind of encapsulating method of novel mesolow cylinder split |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510102381.9A CN104819017B (en) | 2015-03-09 | 2015-03-09 | A kind of encapsulating method of novel mesolow cylinder split |
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| CN104819017A CN104819017A (en) | 2015-08-05 |
| CN104819017B true CN104819017B (en) | 2016-09-28 |
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| CN201510102381.9A Active CN104819017B (en) | 2015-03-09 | 2015-03-09 | A kind of encapsulating method of novel mesolow cylinder split |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107262763B (en) * | 2017-07-14 | 2019-02-26 | 哈尔滨汽轮机厂有限责任公司 | Million nuclear steam turbine stator portions cover split hardfacing alloy layer pin hole processing method |
| CN116422779A (en) * | 2023-03-13 | 2023-07-14 | 武汉英信达科技有限公司 | Stamping die for automobile parts |
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| GB286076A (en) * | 1927-02-19 | 1928-03-01 | English Electric Co Ltd | Improvements in and connected with the construction of pressure-tight casings |
| GB510505A (en) * | 1938-01-27 | 1939-08-02 | British Thomson Houston Co Ltd | Improvements in casings for elastic fluid turbines |
| US3141651A (en) * | 1962-08-13 | 1964-07-21 | Gen Electric | Turbine shroud structure |
| CH705190A1 (en) * | 2011-06-21 | 2012-12-31 | Alstom Technology Ltd | Pressure housing for carrying e.g. guide vanes of turbo-machine, has housing shells sealingly pressed against each other in separation plane by clamp, which is screwed with housing such that clamp transfers bending torques between shells |
| CN103343705A (en) * | 2013-07-19 | 2013-10-09 | 东方电气集团东方汽轮机有限公司 | Method for sealing middle-split surface of steam turbine and sealing structure |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58178054A (en) * | 1982-04-14 | 1983-10-18 | Toshiba Corp | Joint sealing method |
| US20140035240A1 (en) * | 2012-08-03 | 2014-02-06 | General Electric Company | Sliding seal for sealing a joint in a turbine casing and method for sealing |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB286076A (en) * | 1927-02-19 | 1928-03-01 | English Electric Co Ltd | Improvements in and connected with the construction of pressure-tight casings |
| GB510505A (en) * | 1938-01-27 | 1939-08-02 | British Thomson Houston Co Ltd | Improvements in casings for elastic fluid turbines |
| US3141651A (en) * | 1962-08-13 | 1964-07-21 | Gen Electric | Turbine shroud structure |
| CH705190A1 (en) * | 2011-06-21 | 2012-12-31 | Alstom Technology Ltd | Pressure housing for carrying e.g. guide vanes of turbo-machine, has housing shells sealingly pressed against each other in separation plane by clamp, which is screwed with housing such that clamp transfers bending torques between shells |
| CN103343705A (en) * | 2013-07-19 | 2013-10-09 | 东方电气集团东方汽轮机有限公司 | Method for sealing middle-split surface of steam turbine and sealing structure |
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