CN204492907U - With the steam turbine low-pressure exhaust casing of grid vortex drag device - Google Patents
With the steam turbine low-pressure exhaust casing of grid vortex drag device Download PDFInfo
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- CN204492907U CN204492907U CN201520182691.1U CN201520182691U CN204492907U CN 204492907 U CN204492907 U CN 204492907U CN 201520182691 U CN201520182691 U CN 201520182691U CN 204492907 U CN204492907 U CN 204492907U
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- vortex drag
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- 238000009434 installation Methods 0.000 claims description 3
- 229910000679 solder Inorganic materials 0.000 claims description 3
- 230000003068 static effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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Abstract
The utility model relates to a kind of steam turbine low-pressure exhaust casing with grid vortex drag device, it is characterized in that: in the steam discharge spiral case of steam turbine low-pressure exhaust casing, be on transverse section, steam discharge volute outlet place and be provided with grid vortex drag device, grid vortex drag device is that m × n the width be made up of horizontal flow-disturbing floor and longitudinal flow-disturbing floor is i, length is the element grid of j.The utility model can weaken the vorticla motion in low pressure exhaust hood, improves the aeroperformance of low pressure exhaust hood and the nonuniformity of outlet steam flow speed, weakens the vibration of cylinder body.
Description
Technical field
The utility model relates to steam turbine low-pressure exhaust casing, particularly a kind of steam turbine low-pressure exhaust casing with grid vortex drag device.
Background technique
Steam turbine low-pressure exhaust casing is the steam flow passage connecting final stage leaf grating and vapour condenser, and its Main Function is well guided in vapour condenser by final stage axial exhaust, simultaneously to steam flow diffusion, the leaving velocity kinetic transformation of final stage steam discharge become pressure energy.Under the condition that condenser pressure is given, exhaust casing, by reducing the exit static pressure of last stage vane of steam turbine, increases the usable enthalpy drop of steam turbine set, thus improves the thermal efficiency of unit.Correlative study result shows, if being caused energy loss to reduce by 10% by exhauster system, then the efficiency of whole steam turbine can be made to increase about 0.15%.
Correlative study result shows, if being caused energy loss to reduce by 10% by exhauster system, then the efficiency of whole steam turbine can be made to increase about 0.15%.
Exhaust casing internal structure is complicated, generally comprise the volute surrounded from the Diffuser axially to radial direction, exhaust casing wall formed by inside and outside guide ring, and some supplementary structures to adopt in order to fixing exhaust casing, comprise the structures such as stiffening rib, supporting post, guide plate.The internal structure of exhaust casing complexity makes steam flow experienced by by axially turning back to radial 90 °, produce strong circumference and radial pressure gradient, form the vortex of large scale, vorticla motion is the major character of three dimensional motion in exhaust casing, is also to cause aerodynamic loss principal element in exhaust casing.
Model utility content
The utility model is the deficiency for avoiding existing for above-mentioned prior art, a kind of steam turbine low-pressure exhaust casing with grid vortex drag device is provided, to weaken the vorticla motion in low pressure exhaust hood, thus improve the aeroperformance of low pressure exhaust hood and the nonuniformity of outlet steam flow speed, weaken the vibration of cylinder body.
The utility model is that technical solution problem adopts following technological scheme:
The utility model with the structural feature of the steam turbine low-pressure exhaust casing of grid vortex drag device is: in the steam discharge spiral case of steam turbine low-pressure exhaust casing, be on transverse section, steam discharge volute outlet place and be provided with grid vortex drag device, described grid vortex drag device is that m × n the width be made up of horizontal flow-disturbing floor and longitudinal flow-disturbing floor is i, length is the element grid of j.
The utility model is with the steam turbine low-pressure exhaust casing of grid vortex drag device, and its structural feature is also:
The material of described grid vortex drag device is identical with turbine condenser material.
Described grid vortex drag device integral solder is in the steam discharge spiral case of exhaust casing, and the installation position of described grid vortex drag device is 200-300mm apart from the outlet of the steam discharge spiral case of described exhaust casing.
By form the horizontal flow-disturbing floor of described element grid and longitudinal flow-disturbing floor on the front-end face in face of vapor flow direction, the dual-side that is positioned at front-end face is set to 45 ° of chamferings.
Compared with the prior art, the utility model beneficial effect is embodied in:
1, the utility model effectively can weaken eddy current and the streamline distortion of upstream spiral case generation, reduces the kinetic energy dissipation of vortex in passage, improves the static pressure recovery capacity of exhaust casing, thus improve the whole efficiency of steam turbine set;
2, in the utility model, grid vortex drag device also has rectified action simultaneously, the nonuniformity of low pressure exhaust hood outlet steam flow can be reduced, improve the perpendicularity of steam discharge, more uniform and stable by low pressure exhaust hood outlet and the combing of vapour condenser entrance steam flow, weaken the impact of lateral flow to cylinder body, reduce the vibration of vapour condenser and low pressure (LP) cylinder.
Accompanying drawing explanation
Fig. 1 is the utility model mesolow exhaust casing and vapour condenser generalized section;
Fig. 2 is grid vortex drag structure drawing of device in the utility model;
Number in the figure: 1 low pressure (LP) cylinder inner casing, 2 movable vanes, 3 low pressure (LP) cylinder rotors, 4 stator blades, 5 steam discharge spiral cases, 6 grid vortex drag devices, 7 vapour condenser, unit 8 grid, the horizontal flow-disturbing floor of 9a, the longitudinal flow-disturbing floor of 9b.
Embodiment
See Fig. 1 and Fig. 2, in the present embodiment with the structural type of the steam turbine low-pressure exhaust casing of grid vortex drag device be:
Include low pressure (LP) cylinder inner casing 1 in low pressure exhaust hood, be fixed on the stator blade 4 on low pressure (LP) cylinder inner casing 1, low pressure (LP) cylinder rotor 3, be arranged on the epitrochanterian movable vane 2 of low pressure (LP) cylinder, and the steam discharge spiral case 5 formed by exhaust casing wall, steam discharge volute outlet place connects vapour condenser 7; In the present embodiment, in the steam discharge spiral case of steam turbine low-pressure exhaust casing, be on transverse section, steam discharge volute outlet place and be provided with grid vortex drag device 6, grid vortex drag device 6 is element grids 8 that m × n the width be made up of horizontal flow-disturbing floor 9a and longitudinal flow-disturbing floor 9b is i, length is j.
In concrete enforcement, the material of grid vortex drag device 6 is identical with turbine condenser material, overall dimensions I × the J of grid vortex drag device 6 is identical with the channel size that low pressure exhaust hood exports, I=m × i, J=n × j grid vortex drag device 6 integral solder are in the steam discharge spiral case of exhaust casing, and the outlet of the steam discharge spiral case 5 of the installation position distance exhaust casing of grid vortex drag device 6 is 200-300mm.
I is the outer width of frame of grid vortex drag device 6, and J is the outer frame length of grid vortex drag device 6, and D is the flow performance length of the rectangular cross section of steam discharge volute outlet, D=2IJ/ (I+J); Element grid 8 meets flow performance length d=2ij/ (i+j) ≈ 0.13D; Meet i/j ≈ J/I, such transverse and longitudinal grid number is than m/n ≈ (I/J) ^2 simultaneously.
In the present embodiment, grid vortex drag device 6 is longitudinal type, and namely longitudinal flow-disturbing rib length of element grid 8 is greater than horizontal flow-disturbing rib length, longitudinally refers to the direction consistent with the outer width of frame of grid vortex drag device 6; Relative to pattern and and lateral mode, longitudinal type grid vortex drag device pitot loss is smaller, and rectified action is also relatively good; The thickness arranging grid vortex drag device 6 is 1.5-2D.
In the present embodiment, by the horizontal flow-disturbing floor of Component units grid 8 and longitudinal flow-disturbing floor on the front-end face in face of vapor flow direction, the dual-side that is positioned at front-end face is set to 45 ° of chamferings, the first is for the ease of processing, and it two is that the aisle spare that can reduce in flowing suddenlys change the local losses caused.
Claims (4)
1. with the steam turbine low-pressure exhaust casing of grid vortex drag device, it is characterized in that: in the steam discharge spiral case of steam turbine low-pressure exhaust casing, be on transverse section, steam discharge volute outlet place and be provided with grid vortex drag device (6), described grid vortex drag device (6) is the element grid (8) that m × n the width be made up of horizontal flow-disturbing floor (9a) and longitudinal flow-disturbing floor (9b) is i, length is j.
2. the steam turbine low-pressure exhaust casing with grid vortex drag device according to claim 1, is characterized in that: the material of described grid vortex drag device (6) is identical with turbine condenser material.
3. the steam turbine low-pressure exhaust casing with grid vortex drag device according to claim 1, it is characterized in that: described grid vortex drag device (6) integral solder is in the steam discharge spiral case of exhaust casing, and the installation position of described grid vortex drag device (6) is 200-300mm apart from the outlet of the steam discharge spiral case (5) of described exhaust casing.
4. the steam turbine low-pressure exhaust casing with grid vortex drag device according to claim 1, is characterized in that: by the horizontal flow-disturbing floor (9a) of Component units grid (8) and longitudinal flow-disturbing floor (9b) on the front-end face in face of vapor flow direction, the dual-side that is positioned at front-end face is set to 45 ° of chamferings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520182691.1U CN204492907U (en) | 2015-03-27 | 2015-03-27 | With the steam turbine low-pressure exhaust casing of grid vortex drag device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520182691.1U CN204492907U (en) | 2015-03-27 | 2015-03-27 | With the steam turbine low-pressure exhaust casing of grid vortex drag device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204492907U true CN204492907U (en) | 2015-07-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520182691.1U Expired - Fee Related CN204492907U (en) | 2015-03-27 | 2015-03-27 | With the steam turbine low-pressure exhaust casing of grid vortex drag device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204492907U (en) |
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2015
- 2015-03-27 CN CN201520182691.1U patent/CN204492907U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150722 Termination date: 20200327 |
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| CF01 | Termination of patent right due to non-payment of annual fee |