CN110318820B - Stationary blade composite dehumidifying structure of steam turbine - Google Patents
Stationary blade composite dehumidifying structure of steam turbine Download PDFInfo
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- CN110318820B CN110318820B CN201910562380.0A CN201910562380A CN110318820B CN 110318820 B CN110318820 B CN 110318820B CN 201910562380 A CN201910562380 A CN 201910562380A CN 110318820 B CN110318820 B CN 110318820B
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- suction
- steam turbine
- cavity
- stationary blade
- vane
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- 239000002131 composite material Substances 0.000 title claims abstract description 13
- 238000007791 dehumidification Methods 0.000 claims abstract description 32
- 238000010438 heat treatment Methods 0.000 claims abstract description 30
- 238000007664 blowing Methods 0.000 claims abstract description 14
- 239000002184 metal Substances 0.000 claims abstract description 12
- 238000010408 sweeping Methods 0.000 claims abstract description 6
- 238000001704 evaporation Methods 0.000 claims abstract description 3
- 230000008020 evaporation Effects 0.000 claims abstract description 3
- 239000002352 surface water Substances 0.000 claims abstract 6
- 238000012856 packing Methods 0.000 claims abstract 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 35
- 238000010926 purge Methods 0.000 claims description 15
- 238000010521 absorption reaction Methods 0.000 claims description 14
- 230000003068 static effect Effects 0.000 claims description 11
- 230000009471 action Effects 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 230000006872 improvement Effects 0.000 description 4
- 238000005192 partition Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 210000004907 gland Anatomy 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
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Classifications
-
- 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
- F01D25/32—Collecting of condensation water; Drainage ; Removing solid particles
-
- 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
- F01D9/00—Stators
- F01D9/02—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Drying Of Gases (AREA)
Abstract
The invention discloses a stationary blade composite dehumidifying structure of a steam turbine, which comprises a stationary blade suction dehumidifying, stationary blade cavity heating and blowing dehumidifying structure of the steam turbine, and a suction slit and a blowing slit which are arranged on the surface of the stationary blade; wherein, have two independent cavities in the quiet leaf of steam turbine, be the suction cavity who is located quiet leaf leading edge respectively, inside packing has porous metal, a suction dehumidification for realize the quiet leaf surface water film of steam turbine, and be located the heating of quiet leaf trailing edge and sweep the cavity, be hollow cavity, a heating evaporation and the sweeping of trailing edge surface water film that are used for realizing the quiet leaf surface water film of steam turbine simultaneously tear, the suction gap is seted up on the suction surface and the pressure surface of quiet leaf leading edge, the sweep the gap and seted up at quiet leaf trailing edge. The invention has simple and reasonable integral design, can meet the requirement of variable working condition operation of the steam turbine, can greatly improve the dehumidification efficiency of the steam turbine and ensure the safety and the economical efficiency of the operation of the steam turbine.
Description
Technical Field
The invention belongs to the technical field of steam turbines, and particularly relates to a stationary blade composite dehumidifying structure of a steam turbine.
Background
The steam turbine is a main power device for converting steam heat energy into mechanical energy, and is widely applied to the industrial fields of electric power, chemical industry, nuclear power and the like. The widely existing problem is that steam expands in the turbine to a certain extent and spontaneously condenses to form nuclei and form small water droplets, so that the last stages of a high-power turbine and most nuclear turbines operate in a wet steam state. And the blades of the steam turbine can be seriously eroded and even broken under the long-term high-speed impact of water drops, so that the damage of the steam turbine is caused. At the same time, the increased humidity of the steam reduces the efficiency of the turbine stage, causing significant economic losses.
In order to reduce the steam humidity in the steam turbine, methods such as stationary blade dehumidification, movable blade dehumidification, partition plate installation separation device, and the like are generally employed in the turbine stage. The dehumidification method in the stationary blade of the steam turbine can be divided into the following steps according to different working modes: vane suction dehumidification, vane cavity heating, and purge dehumidification. Suction dehumidification usually sets up 1 to 2 moisture absorption seams on the pressure surface or the suction surface near quiet leaf leading edge, and the optimal design scheme will guarantee that pressure is equal in the dehumidification seam department of pressure surface and suction surface, but receives the restriction of blade type line structure and the influence of variable working condition operation, and the dehumidification seam department of pressure surface and suction surface always has certain pressure differential, leads to moisture to spout directly from another gap after inhaling from a gap, and the water film is the series flow to very big reduction dehumidification efficiency. The stator blade cavity is heated by introducing high-temperature and high-pressure steam into the stator blade cavity to heat the inner wall surface, so that a water film on the outer surface of the stator blade is evaporated, and the formation of secondary water drops is reduced; meanwhile, the blowing gaps can be formed in the inner arc or the back arc of the static blade or even the tail edge and other positions, the flowing water films on the surfaces of the static blades are blown away and torn through the gaps, and the flowing water films on the surfaces of the static blades can be effectively removed through reasonable blowing gap structures and pressure gradients.
In the prior art, different dehumidification methods have advantages and disadvantages, but because the design of a dehumidification structure is complex, under a specific design condition, only a single dehumidification method is adopted generally, so that the dehumidification efficiency of a steam turbine is low, and particularly under a variable working condition, the actual operation of the dehumidification structure of the steam turbine deviates from the design working condition, so that the optimal dehumidification effect is difficult to achieve.
Disclosure of Invention
The invention aims to provide a stationary blade composite dehumidifying structure of a steam turbine, which combines three methods of stationary blade suction dehumidifying, stationary blade cavity heating and blowing dehumidifying, has simple and reasonable integral structure design, can meet the requirement of variable working condition operation of the steam turbine, can greatly improve the dehumidifying efficiency of the steam turbine, and ensures the safety and the economical efficiency of the operation of the steam turbine.
The invention is realized by adopting the following technical scheme:
the utility model provides a quiet leaf compound dehumidification structure of steam turbine, includes that the quiet leaf of steam turbine sucks dehumidification structure, quiet leaf cavity heating structure and sweeps dehumidification structure, quiet leaf design to and set up at the suction seam on quiet leaf surface and sweep the seam. The steam turbine static blade is characterized in that two independent cavities are arranged in the steam turbine static blade, the suction cavity is located at the front edge of the static blade, porous metal is filled in the suction cavity and used for realizing suction and dehumidification of a water film on the surface of the static blade of the steam turbine, the heating and blowing cavity is located at the rear edge of the static blade and is a hollow cavity and used for simultaneously realizing heating evaporation of the water film on the surface of the static blade of the steam turbine and blowing and tearing of the water film on the surface of the tail edge, the suction gap is formed in the suction surface and the pressure surface of the front edge of the static blade, and the blowing gap is formed in the.
A further improvement of the invention is that the vane suction chamber is located at the vane leading edge and is internally filled with porous metal in the pores of which steam or water can flow freely. The top of the suction chamber is connected with the last stage exhaust chamber of the steam turbine sequentially through a suction chamber steam inlet hole, a partition plate inner cavity and a pressure valve, and the bottom of the suction chamber is connected with the inner drainage chamber of the steam turbine sequentially through a suction chamber water outlet, an inner flow passage of the blade root and the pressure valve. The blade root of the turbine stator blade is connected with the turbine rotor through a gland seal.
The invention is further improved in that the stator blade suction slots are arranged on the suction surface and the pressure surface of the front edge of the stator blade and extend to the top at the blade height of the stator blade 2/3, and the suction slots are composed of a first moisture absorption groove, a second moisture absorption groove and a third moisture absorption groove as well as a first moisture absorption hole, a second moisture absorption hole and a third moisture absorption hole which are uniformly distributed and matched with each other.
The invention has the further improvement that the stator blade heating and purging cavity is positioned at the rear edge of the stator blade and is a hollow cavity, the top of the cavity is connected with a new steam pipeline of the steam turbine, new steam with high temperature and high pressure flows into the cavity through the pressure regulating valve to heat the inner wall surface of the stator blade, so that a water film on the outer surface is evaporated, and the formation of secondary water drops on the surface of the stator blade is reduced. The fixed blade sweeping seam is arranged at the tail edge of the fixed blade, the outlet angle is matched with the tail edge molded line of the fixed blade, and the introduced dry steam can be blown out from the sweeping seam at the tail edge of the fixed blade due to the fact that the steam pressure introduced into the hollow cavity is greater than the external pressure at the tail edge of the fixed blade, and the water film flowing on the surface of the fixed blade is blown away and torn directly.
The invention has the further improvement that the strengthening ribs are uniformly arranged in the heating and purging cavity of the stationary blade along the blade height direction, and the arrangement of the ribs maintains the outlet angle of the tail edge on one hand, increases the rigidity and stability of the stationary blade, enhances the flow heat exchange strength of steam in the cavity on the other hand, and improves the heating and dehumidifying effects.
The invention has the following beneficial technical effects:
1. the steam turbine stationary blade composite dehumidification structure combines the stationary blade seam suction dehumidification method, the stationary blade cavity heating method and the blowing dehumidification method, has simple and reasonable integral structure design, and ensures extremely high steam turbine dehumidification efficiency.
2. The stationary blade suction and dehumidification chamber is filled with porous metal, so that the phenomenon of water film streaming is avoided, the stationary blade dehumidification efficiency is greatly improved, the operation requirement of variable working conditions can be met, the selection of the opening positions and the number of suction seams is more flexible, and the design and manufacturing difficulty is greatly reduced.
3. According to the fixed blade heating and blowing cavity, the reinforcing ribs are uniformly arranged in the blade height direction, so that on one hand, the outlet angle of the tail edge is maintained, the rigidity and stability of the fixed blade are improved, on the other hand, the flowing heat exchange strength of steam in the cavity is enhanced, and the dehumidification effect of the fixed blade is improved.
Drawings
FIG. 1 is a schematic view of a stationary blade combined dehumidification structure of a steam turbine according to the present invention.
FIG. 2 is a sectional schematic view of a vane structure.
Description of reference numerals:
1-steam turbine steam inlet pipeline, 2-final stage exhaust chamber, 3-internal drainage chamber, 4-clapboard, 5-suction chamber steam inlet hole, 6-heating chamber steam inlet hole, 7-stationary blade, 8-suction chamber water outlet, 9-blade root, 10-steam seal, 11-rotor, 12-first moisture absorption groove, 13-suction hole, 14-moisture absorption groove, 15-suction hole, 16-suction chamber, 17-moisture absorption groove, 18-suction hole, 19-stationary blade, 20-fin, 21-heating and blowing chamber.
Detailed Description
The invention will be further explained with reference to the drawings in which:
referring to fig. 1 to 2, the vane composite dehumidifying structure of a steam turbine according to the present invention includes a vane suction dehumidifying structure, a vane cavity heating structure, a purging dehumidifying structure, a vane design, and a suction slit and a purging slit disposed on a surface of the vane.
Referring to fig. 1, the suction chamber 16 of the vane 7 is located at the vane leading edge and is filled with a porous metal in the pores of which steam or water can freely flow. The top of the suction chamber 16 is connected with the last stage exhaust chamber 2 of the steam turbine sequentially through a suction chamber steam inlet hole 5, a partition plate inner cavity 4 and a pressure valve, and the bottom of the suction chamber 16 is connected with the inner drainage chamber 3 of the steam turbine sequentially through a suction chamber water outlet 8, an inner flow passage of a blade root 9 and the pressure valve. The blade root 9 of the turbine stator blade is connected to the turbine rotor 11 via a gland seal 10.
Referring to fig. 2, the suction slots of the stator vanes 7 are opened on the suction side and the pressure side of the leading edges of the stator vanes and extend to the top at the height of the vanes 2/3, and the suction slots include a first suction groove 12 and a first suction hole 13, a second suction groove 14 and a second suction hole 15, and a third suction groove 17 and a third suction hole 18, which are uniformly distributed and used in cooperation. When the wet steam and the water film flow over the surfaces of the stationary blades 7, moisture is collected by the moisture absorption grooves, and the moisture flows into the porous metal in the suction chamber 16 through the moisture absorption holes, and flows up and down along the inner pores of the porous metal. Because the pressure in the last stage exhaust chamber 2 is low, and thus a positive pressure difference is formed, which is directed from the suction chamber 16 of the stator blade to the last stage exhaust chamber 2, most of the water flows upwards from the top of the suction chamber 16 into the last stage exhaust chamber 2 of the steam turbine under the action of the pressure gradient, and the excess water is collected by the blade root 9 via the suction chamber water discharge opening 8 and flows into the inner water discharge chamber 3 of the steam turbine.
In the previous design, the stationary blade suction chamber 16 is a hollow chamber, all gaps are required to be arranged at the places where the steam pressure on the surface of the stationary blade is equal, and the water film streaming can be avoided. In the invention, the stationary blade suction chamber 16 is filled with porous metal, the water film is converged into the porous metal through the dehumidification holes, even if the pressures at different suction seams are different, the water film can directly flow to the top or the bottom in the porous metal gap along the blade height direction under a larger pressure gradient without the phenomenon of water film streaming, thereby greatly improving the stationary blade dehumidification efficiency, being capable of adapting to the operation requirements of variable working conditions, and simultaneously, the selection of the positions and the number of the suction seams is more flexible.
Referring to fig. 1 to 2, the heating and purging chamber 21 of the stationary blade 7 is located at the rear edge of the stationary blade and is a hollow chamber, the top of the heating and purging chamber is connected with the steam inlet pipeline 1 of the steam turbine sequentially through the steam inlet hole 6 of the heating chamber, the inner cavity 4 of the partition plate and the pressure valve, high-temperature and high-pressure steam flows into the heating and purging chamber 21 through the pressure valve, the inner wall surface of the stationary blade is heated, a water film on the outer surface is evaporated, and the formation of secondary water drops on the surface of the. The fixed blade sweeping seam is arranged at the tail edge of the fixed blade, the outlet angle is matched with the tail edge molded line of the fixed blade 19, and the introduced dry steam can be blown out from the sweeping seam at the tail edge of the fixed blade due to the fact that the steam pressure introduced into the hollow cavity is larger than the external pressure at the tail edge of the fixed blade, and the water film flowing on the surface of the fixed blade is blown off and torn directly.
Fins 20 are uniformly arranged in the heating and purging cavity 21 of the stationary blade 7 along the blade height direction, on one hand, the outlet angle of the tail edge is maintained due to the arrangement of the fins 21, the rigidity and stability of the stationary blade are improved, on the other hand, the flowing heat exchange strength of steam in the heating and purging cavity 21 is enhanced, and the heating and dehumidifying effects are improved.
The above description is only a preferred embodiment of the present invention, and any improvements, modifications or other embodiments obtained by those skilled in the art without making creative efforts shall be included in the protection scope of the present invention.
Claims (6)
1. A stationary blade composite dehumidifying structure of a steam turbine is characterized by comprising a stationary blade suction dehumidifying structure of the steam turbine, a stationary blade cavity heating structure, a blowing dehumidifying structure, a suction slit and a blowing slit, wherein the suction slit and the blowing slit are formed in the surface of the stationary blade; wherein the content of the first and second substances,
have two independent cavities in quiet leaf (7) of steam turbine, be respectively for suction cavity (16) that are located quiet leaf leading edge, inside packing has porous metal, a suction dehumidification for realizing the quiet leaf surface water film of steam turbine, and be located the heating of quiet leaf trailing edge and sweep cavity (21), be hollow cavity, a heating evaporation and the sweeping of trailing edge surface water film that are used for realizing the quiet leaf surface water film of steam turbine simultaneously tear, suction gap sets up on the suction surface and the pressure surface of quiet leaf leading edge, sweep the seam and set up at quiet leaf trailing edge.
2. The stationary blade composite dehumidifying structure of a steam turbine according to claim 1, wherein the top of the suction chamber (16) is connected to the last stage exhaust chamber (2) of the steam turbine sequentially through a suction chamber steam inlet hole (5), a diaphragm inner cavity (4) and a pressure valve, and the bottom of the suction chamber (16) is connected to the inner drainage chamber (3) of the steam turbine sequentially through a suction chamber water outlet (8), the inner flow of the blade root (9) and the pressure valve.
3. A vane composite dehumidifying structure of a steam turbine according to claim 1, wherein the suction slots of the vane (7) are opened on the suction side and the pressure side of the vane leading edge, and extend to the top at the vane 2/3 blade height, and comprise a first suction groove (12) and a first suction hole (13), a second suction groove (14) and a second suction hole (15), and a third suction groove (17) and a third suction hole (18) which are uniformly distributed and used in cooperation; when wet steam and a water film flow through the surface of the static blade (7), moisture is collected by the moisture absorption grooves and flows into the porous metal in the suction cavity (16) through the moisture absorption holes, most of the moisture flows upwards from the top of the suction cavity (16) into the final stage exhaust cavity (2) of the steam turbine under the action of pressure gradient, and redundant moisture is collected by the blade root (9) through the water discharge opening (8) of the suction cavity and flows into the inner water discharge cavity (3) of the steam turbine.
4. The stationary blade composite dehumidifying structure of the steam turbine according to claim 1, wherein the top of the heating and purging chamber (21) is connected to the steam inlet pipeline (1) of the steam turbine sequentially through the steam inlet hole (6) of the heating chamber, the inner cavity (4) of the diaphragm, and the pressure valve, and high-temperature and high-pressure steam flows into the heating and purging chamber (21) through the pressure valve, heats the inner wall surface of the stationary blade, and is blown out from the purging slit at the trailing edge of the stationary blade.
5. A vane composite dehumidifying structure of a steam turbine according to claim 1, wherein the vane purge slit is provided at a vane trailing edge, and an outlet angle is matched with a trailing edge profile of the vane (19).
6. A vane composite dehumidifying structure of a steam turbine according to claim 1, characterized in that ribs (20) are uniformly arranged in the direction of the vane height in the heating and purging chamber (21) of the vane (7).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910562380.0A CN110318820B (en) | 2019-06-26 | 2019-06-26 | Stationary blade composite dehumidifying structure of steam turbine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910562380.0A CN110318820B (en) | 2019-06-26 | 2019-06-26 | Stationary blade composite dehumidifying structure of steam turbine |
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| CN110318820A CN110318820A (en) | 2019-10-11 |
| CN110318820B true CN110318820B (en) | 2021-02-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112610285B (en) * | 2020-12-18 | 2021-09-14 | 武汉大学 | Hollow quiet leaf of imitative diamond cell topology's steam turbine strengthens dehumidification structure and steam turbine dehydrating unit |
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|---|---|---|---|---|
| JP2004124751A (en) * | 2002-09-30 | 2004-04-22 | Toshiba Corp | Moisture separation device for steam turbine |
| JP2007170211A (en) * | 2005-12-20 | 2007-07-05 | Toshiba Corp | Moisture separator of steam turbine and steam turbine having it |
| CN101255805A (en) * | 2008-03-11 | 2008-09-03 | 西安交通大学 | Wet vapor level suction dehumidifier for steam turbine |
| EP2282013A2 (en) * | 2009-06-30 | 2011-02-09 | General Electric Company | Moisture removal provisions for steam turbine |
| JP2012202314A (en) * | 2011-03-25 | 2012-10-22 | Toshiba Corp | Moisture removing apparatus of steam turbine |
| JP2013185494A (en) * | 2012-03-08 | 2013-09-19 | Mitsubishi Heavy Ind Ltd | Steam turbine including steam sealing function and moisture removing function |
| CN103437831A (en) * | 2013-08-28 | 2013-12-11 | 国家电网公司 | Steam turbine stator with serpentine channel and steam turbine stator heating and dehumidifying device |
| WO2019117752A1 (en) * | 2017-12-12 | 2019-06-20 | Публичное Акционерное Общество "Силовые Машины-Зтл, Лмз, Электросила, Энергомашэкспорт" (Пао "Силовые Машины") | Guide vane for a wet steam turbine |
-
2019
- 2019-06-26 CN CN201910562380.0A patent/CN110318820B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004124751A (en) * | 2002-09-30 | 2004-04-22 | Toshiba Corp | Moisture separation device for steam turbine |
| JP2007170211A (en) * | 2005-12-20 | 2007-07-05 | Toshiba Corp | Moisture separator of steam turbine and steam turbine having it |
| CN101255805A (en) * | 2008-03-11 | 2008-09-03 | 西安交通大学 | Wet vapor level suction dehumidifier for steam turbine |
| EP2282013A2 (en) * | 2009-06-30 | 2011-02-09 | General Electric Company | Moisture removal provisions for steam turbine |
| JP2012202314A (en) * | 2011-03-25 | 2012-10-22 | Toshiba Corp | Moisture removing apparatus of steam turbine |
| JP2013185494A (en) * | 2012-03-08 | 2013-09-19 | Mitsubishi Heavy Ind Ltd | Steam turbine including steam sealing function and moisture removing function |
| CN103437831A (en) * | 2013-08-28 | 2013-12-11 | 国家电网公司 | Steam turbine stator with serpentine channel and steam turbine stator heating and dehumidifying device |
| WO2019117752A1 (en) * | 2017-12-12 | 2019-06-20 | Публичное Акционерное Общество "Силовые Машины-Зтл, Лмз, Электросила, Энергомашэкспорт" (Пао "Силовые Машины") | Guide vane for a wet steam turbine |
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| CN110318820A (en) | 2019-10-11 |
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