CN204457893U - Steam turbine and steam turbine - Google Patents
Steam turbine and steam turbine Download PDFInfo
- Publication number
- CN204457893U CN204457893U CN201520103048.5U CN201520103048U CN204457893U CN 204457893 U CN204457893 U CN 204457893U CN 201520103048 U CN201520103048 U CN 201520103048U CN 204457893 U CN204457893 U CN 204457893U
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- inner casing
- steam turbine
- steel plate
- protective coating
- utility
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- 239000011253 protective coating Substances 0.000 claims abstract description 28
- 238000010276 construction Methods 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 32
- 239000010959 steel Substances 0.000 claims description 32
- 239000011229 interlayer Substances 0.000 abstract description 10
- 239000010410 layer Substances 0.000 abstract description 4
- 230000008646 thermal stress Effects 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008642 heat stress Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The utility model discloses a kind of steam turbine and steam turbine, described steam turbine has the double layer construction comprising outer shell and inner casing (1), be provided with the protective coating of the outer surface covering described inner casing (1) between described outer shell and described inner casing (1), and between the outer surface of described protective coating and described inner casing (1), there is gap.The steam turbine that the utility model provides and steam turbine, by arranging the protective coating between the outer surface of inner casing with gap on the outer surface of inner cylinder, the outer surface of the steam in interlayer between inner casing and outer shell or other medium and inner casing can be isolated by protective coating, the steam in interlayer or other medium is made directly not to contact the outer surface of inner casing, the final temperature difference realizing reduction inner casing inner and outer surface, thus reduction thermal stress, alleviate the deformation extent of inner casing.
Description
Technical field
The utility model relates to steam turbine technology field, particularly, relates to a kind of steam turbine and steam turbine.
Background technique
At present, for high parameter, high-power, resuperheat steam turbine, cylinder structure mostly adopts the double shell structure comprising inner casing and outer shell, by adopting double shell structure, the casing wall of every layer of cylinder can be relatively thinning, and for preventing cylinder heat to be out of shape, in inside and outside cylinder interlayer, be filled with the steam of cylinder discharge, to reduce the casing wall temperature difference of inside and outside cylinder, cylinder heat stress is reduced, shortens the Unit Commitment time simultaneously; In addition, by adopting double shell structure, because the running temperature of outer shell is lower, general alloy steel material manufacture can be adopted, only having inner casing need adopt valuable heat-resisting allay material, thus decrease the consumption of valuable heat-resisting allay material, reduce manufacture cost.
But, steam turbine adopts double shell structure, although be filled with the steam of cylinder discharge in the interlayer of interior outer shell, but the temperature of steam is relative to the vapor (steam) temperature in inner casing or relatively low in interlayer, such as 300MW Sub-critical Parameter, the low pressure (LP) cylinder inner casing throttle (steam) temperature of resuperheat steam turbine is generally all more than 360 DEG C, low pressure (LP) cylinder exhaust temperature in the interlayer that low-pressure internal cylinder outer wall directly contacts is 40-60 DEG C, temperature difference between inner casing inside and outside wall reaches 300 DEG C, therefore result in the problem on deformation of inner casing, simultaneously, the inside wall of cylinder makes inner casing produce permanent deformation because of compression chord, interior inside wall of cylinder circumference is shortened, and outer wall is substantially constant, therefore cylinder flange mating face place mainly presents interior opening deformation.Serious reaches more than 5 millimeters, this gross distortion, turbine rotor and central cylindrical is made to occur decentraction, the resistance vapour sheet dynamic and static gaps of turbine rotor and cylinder is irregular, little place, gap affects unit and expands, and easily sound friction occurs, affects unit safety operation, gap general goal Steam loss increases, and unit economy is declined.Inner cylinder Deformation Repair difficulty is large, often makes maintenance duration extend, affects factory's benefit, even if after repairing, be difficult to reach original design fitted position, the resistance vapour sheet dynamic and static gaps of the turbine rotor after reparation and cylinder is all bigger than normal, cause turbine efficiency to decline, economic performance reduces.
Model utility content
The purpose of this utility model is to provide a kind of steam turbine and steam turbine, is out of shape serious problem for solving the inner casing of steam turbine in prior art.
To achieve these goals, the utility model provides a kind of steam turbine, described steam turbine has the double layer construction comprising outer shell and inner casing, be provided with the protective coating of the outer surface covering described inner casing between described outer shell and described inner casing, and between the outer surface of described protective coating and described inner casing, there is gap.
Preferably, described protective coating is mutually laminated by multiple steel plate and is formed.
Preferably, the width laminated between described steel plate is 5-15mm.
Preferably, each described steel plate is fixed on the outer surface of described inner casing by fixing device.
Preferably, described fixing device comprises the nut on the bolt be assemblied on steel plate described in every block and the outer surface being fixed on described inner casing, described steel plate by described bolt and described nut coordinate be fixed on described inner casing outer surface on.
Preferably, described nut-welding is fixed on the outer surface of described inner casing.
Preferably, described bolt is stud bolt, and described steel plate is fixed on one end away from described inner casing of described bolt by double nut.
Preferably, towards the direction at the edge of described inner casing, described gap is tending towards reducing.
The utility model also provides a kind of steam turbine, and described steam turbine comprises cylinder, and described cylinder is steam turbine as above.
The steam turbine that the utility model provides and steam turbine, by arranging the protective coating with the outer surface of inner casing with gap on the outer surface of inner cylinder, the outer surface of the steam in interlayer between inner casing and outer shell or other medium and inner casing can be isolated by protective coating, the steam in interlayer or other medium is made directly not to contact the outer surface of inner casing, final realization reduces inner casing inner and outer surface temperature difference, thus reduction thermal stress, alleviate the deformation extent of inner casing.
Other features and advantages of the utility model are described in detail in embodiment part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide further understanding of the present utility model, and forms a part for specification, is used from explanation the utility model, but does not form restriction of the present utility model with embodiment one below.In the accompanying drawings:
The structural representation of a kind of mode of execution of the steam turbine that Fig. 1 provides for the utility model;
Fig. 2 is the structural representation of the inner casing edge of cylinder.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail.Should be understood that, embodiment described herein, only for instruction and explanation of the utility model, is not limited to the utility model.
The utility model provides a kind of steam turbine, this steam turbine has the double layer construction comprising outer shell and inner casing 1, wherein, between described outer shell and inner casing 1, the outer surface of inner casing 1 is coated with protective coating, and between the outer surface of this protective coating and inner casing 1, there is gap.
Basic fundamental design of the present utility model is by arranging the protective coating with the outer surface of inner casing 1 with gap on the outer surface of inner casing 1, steam between inner casing 1 and outer shell in interlayer or other medium are located substantially between outer shell and protective coating, steam in interlayer or other medium and inner casing 1 outer surface are isolated, directly do not contact the outer surface of inner casing 1, final realization reduces inner casing 1 inner and outer surface temperature difference, thus reduction thermal stress, alleviate the deformation extent of inner casing 1.
In preferred implementation of the present utility model, as shown in Figure 1, the protective coating covered at inner casing 1 outer surface mutually to be laminated by multiple steel plate 2 and is formed, the multiple steel plates 2 mutually laminated are independent of each other, free expanding, also can not affect inner casing 1 free expansion in working order, safe and reliable.Wherein, steel plate 2 preferably adopts stainless steel, and stainless steel can not corrosion, also can not pollute the steam in steam turbine and water quality because of corrosion.
It will be appreciated by those skilled in the art that, the protective coating that inner casing 1 outer surface covers is not limited to mutually be laminated by plurality of steel plates 2 formed, it can also be the protective coating of other structure, tabular protective coating as covered the entirety of inner casing 1 outer surface also can play insulation, effect of heat insulation to inner casing 1 outer surface, the thermal stress reducing the inner cylinder inside and outside wall temperature difference and produce can be reached, prevent the object that inner casing 1 deforms.The protective coating mutually laminating formation by multiple steel plate provided in present embodiment is the preferred implementation considered protective coating expanded by heating and adopt, but is not limited to this.
For avoiding more vapour transmission protective coating to enter between protective coating and inner casing 1, consider again the consumption of steel plate, preferably, the width a mutually laminated between steel plate 2 is 5-15mm simultaneously.
In addition, as shown in Figure 2, for protecting inner casing 1 better, the direction that protective coating extends to the edge of inner casing 1, gap between protective coating and inner casing 1 is tending towards reducing, enable protective coating be held in outer surface of cylinder block in the edge section near cylinder body, avoid more steam to enter between protective coating and inner casing 1 from the edge of inner casing 1.
Illustrate below in present embodiment each steel plate mutually laminated how to fix.
As shown in Figures 1 and 2, each steel plate 2 is fixed on described inner casing 1 outer surface by fixing device 3.
Preferably, fixing device 3 comprises the bolt 31 be assemblied on every block plate 2 and the nut 34 be fixed on inner casing 1 outer surface, and steel plate 2 is fixed on inner casing 1 outer surface with coordinating of nut 34 by bolt 31.
Wherein, nut 34 is specifically by being weldingly fixed on the outer surface of inner casing 1, and bolt 31 is stud bolt, and steel plate 2 is fixed on one end away from inner casing 1 of bolt 31 by double nut.Namely one end of stud bolt 31 is located on steel plate 2, and is fixed on the end of this bolt by nut 32 and nut 33, and the other end is spun on the fixing nut 34 of inner casing 1 outer surface, can realize the fixing of each steel plate 2.
As shown in Figures 1 and 2, in the non-edge position of inner casing 1, each steel plate 2 is staggered to be laminated structure after each steel plate 2 is fixing on inner casing 1, and the gap between the steel plate 2 at interval and the outer surface of inner casing 1 is identical.And in the submarginal position of inner casing 1, the gap between steel plate 2 and inner casing 1 outer surface reduces gradually, steel plate 2 is close on the edge of inner casing 1.
Those skilled in the art are appreciated that equally, each steel plate 2 is fixedly not limited to being fixed by bolt and nut in present embodiment at inner casing 1 outer surface, also other means of fixation can be adopted, cylinder is set as adopted, the means of fixation welded together with the outer surface of inner casing 1 by steel plate 2 by cylinder.
The utility model also provides a kind of steam turbine, and this steam turbine comprises cylinder, and described cylinder is steam turbine as above.Adopt the steam turbine that the utility model provides, inner casing amount of deformation is wherein little, thus can avoid the problem affecting unit safety operation because inner casing amount of deformation is large.
Below preferred implementation of the present utility model is described by reference to the accompanying drawings in detail; but; the utility model is not limited to the detail in above-mentioned mode of execution; within the scope of technical conceive of the present utility model; can carry out multiple simple variant to the technical solution of the utility model, these simple variant all belong to protection domain of the present utility model.
It should be noted that in addition, each concrete technical characteristics described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode, in order to avoid unnecessary repetition, the utility model illustrates no longer separately to various possible compound mode.
In addition, also can carry out combination in any between various different mode of execution of the present utility model, as long as it is without prejudice to thought of the present utility model, it should be considered as content disclosed in the utility model equally.
Claims (9)
1. a steam turbine, described steam turbine has the double layer construction comprising outer shell and inner casing (1), it is characterized in that, be provided with the protective coating of the outer surface covering described inner casing (1) between described outer shell and described inner casing (1), and between the outer surface of described protective coating and described inner casing (1), there is gap.
2. steam turbine according to claim 1, is characterized in that, described protective coating is mutually laminated by multiple steel plate (2) and formed.
3. steam turbine according to claim 2, is characterized in that, the width laminated between described steel plate (2) is 5-15mm.
4. steam turbine according to claim 2, is characterized in that, each described steel plate (2) is fixed on the outer surface of described inner casing (1) by fixing device (3).
5. steam turbine according to claim 4, it is characterized in that, described fixing device (3) comprises the bolt (31) be assemblied on steel plate (2) described in every block and the nut (34) be fixed on the outer surface of described inner casing (1), described steel plate (2) by described bolt (31) and described nut (34) coordinate be fixed on described inner casing (1) outer surface on.
6. steam turbine according to claim 5, is characterized in that, described nut (34) is weldingly fixed on the outer surface of described inner casing (1).
7. steam turbine according to claim 6, it is characterized in that, described bolt (31) is stud bolt, and described steel plate (2) is fixed on one end away from described inner casing (1) of described bolt (31) by double nut.
8. steam turbine according to claim 1, is characterized in that, towards the direction at the edge of described inner casing (1), described gap is tending towards reducing.
9. a steam turbine, is characterized in that, described steam turbine comprises cylinder, and described cylinder is the steam turbine in claim 1-8 described in any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520103048.5U CN204457893U (en) | 2015-02-12 | 2015-02-12 | Steam turbine and steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520103048.5U CN204457893U (en) | 2015-02-12 | 2015-02-12 | Steam turbine and steam turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204457893U true CN204457893U (en) | 2015-07-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520103048.5U Active CN204457893U (en) | 2015-02-12 | 2015-02-12 | Steam turbine and steam turbine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204457893U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111120015A (en) * | 2019-12-27 | 2020-05-08 | 浙江浙能技术研究院有限公司 | Real-time monitoring system and monitoring method for eccentric swing of 50MW steam turbine cylinder body |
-
2015
- 2015-02-12 CN CN201520103048.5U patent/CN204457893U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111120015A (en) * | 2019-12-27 | 2020-05-08 | 浙江浙能技术研究院有限公司 | Real-time monitoring system and monitoring method for eccentric swing of 50MW steam turbine cylinder body |
| CN111120015B (en) * | 2019-12-27 | 2022-04-29 | 浙江浙能技术研究院有限公司 | Real-time monitoring system and monitoring method for eccentric swing of 50MW steam turbine cylinder body |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |