CN209293858U - Steam turbine discharge guide ring and exhaust casing - Google Patents
Steam turbine discharge guide ring and exhaust casing Download PDFInfo
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- CN209293858U CN209293858U CN201822169241.5U CN201822169241U CN209293858U CN 209293858 U CN209293858 U CN 209293858U CN 201822169241 U CN201822169241 U CN 201822169241U CN 209293858 U CN209293858 U CN 209293858U
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- guide ring
- section
- steam turbine
- steam
- discharge guide
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- 230000004323 axial length Effects 0.000 claims abstract description 11
- 238000010276 construction Methods 0.000 claims description 6
- 238000007493 shaping process Methods 0.000 claims description 5
- 230000001788 irregular Effects 0.000 claims description 4
- 238000011084 recovery Methods 0.000 abstract description 7
- 230000003068 static effect Effects 0.000 abstract description 7
- 238000005457 optimization Methods 0.000 abstract description 6
- 238000012423 maintenance Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 8
- 238000009792 diffusion process Methods 0.000 description 7
- 238000007599 discharging Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The utility model discloses a kind of steam turbine discharge guide ring and exhaust casing, steam discharge guide ring includes: upper half guide ring and lower half guide ring, and the both ends of the upper half guide ring form ring-type with the lower half guide ring respectively；The circumferential direction of the guide ring is cross-section or variable section structure；And the axial length of the lower half guide ring is greater than the axial length of upper half guide ring.The utility model passes through the optimization upper and lower half structure of steam discharge guide ring, reduce upper dimension, be conducive to the maintenance assembly of unit, improve the flow behavior in exhaust passage, promotes the static pressure recovery coefficient of exhaust casing, increase the actually active enthalpy drop of unit, increase unit output, the thermal efficiency for improving unit improves the steam flow regime into vapour condenser, reduces the vapour effluent dynamic resistance of condenser.
Description
Technical field
The utility model relates to steam turbine technology fields, and in particular to a kind of steam turbine discharge guide ring and steam discharge
Cylinder.
Background technique
Exhaust casing is an important component of steam turbine, its main function is connection steam turbine low pressure flow passage portion
Point and condenser, and realize that the leaving velocity kinetic energy of air-flow is partially converted into pressure by deceleration diffusion.The pressure generated in exhaust casing is extensive
Again so that the outlet pressure of turbine final stage is lower than the pressure of condenser, to increase effective enthalpy drop of unit, going out for unit is improved
Power and the thermal efficiency.Meanwhile keeping steam discharge as uniform as possible into condenser with VELOCITY DISTRIBUTION at an appropriate angle.Exhaust casing includes
Lower-discharging type, axis row's formula and side-type, the utility model are primarily adapted for use in lower-discharging type.
Traditional lower-discharging type steam turbine discharge cylinder, guide ring are usually structure symmetrical above and below, and are that cross-section returns
Swivel, as shown in Figure 1 and Figure 2.Due to being limited by low pressure exhaust cylinder upper half geometrical scale, general steam discharge guide ring end
End cannot design it is too long, in order to avoid with the portions such as exhaust casing upper half gusset cover interfere.For lower-discharging type steam turbine, condenser is low
Below cylinder pressure, steam flow enters free wxpansion state by shorter diversion section, and flow organization is bad, and loss is big, diffusion effect
Fruit is undesirable, often the extremely low even negative value of static pressure recovery coefficient, and the flowing for entering condenser is uneven, increases condensing
The vapour collateral resistance of device.
Therefore, it is necessary to improve traditional design, using optimization method, designs better steam discharge diffusion channel and come rationalization
Flow field to utilize leaving velocity to improve static pressure recovery coefficient to a greater extent, and guides steam even into condenser, improves unit effect
Rate.
Utility model content
(1) technical problems to be solved
In view of this, the main purpose of the utility model is to provide a kind of steam turbine discharge guide ring and exhaust casing,
Static pressure recovery coefficient can be improved, make even flow field, so as to improve effective enthalpy drop of steam turbine, increase unit output, mention
High generatine set heat efficiency, and can reduce Steam Side of Condenser resistance, be conducive to the raising of vacuum degree.
(2) technical solution
One side according to the present utility model provides a kind of steam turbine discharge guide ring, comprising: upper half guide ring is under
Half guide ring, the upper half guide ring and the lower half guide ring form ring-type；The circumferential direction of the guide ring is cross-section or change
Cross section structure；And the axial length of the lower half guide ring is greater than the axial length of upper half guide ring.
In a further embodiment, the circumferential cross-section of the upper half guide ring is cross-section or variable cross-section, circumferential direction
Cross section contour shaping rule is identical or different.
In a further embodiment, the bus of the upper half guide ring is straightway, arc section, spline curve, no
Regular curve section or combinations thereof.
In a further embodiment, the circumferential cross-section of the lower half guide ring is cross-section or variable cross-section, circumferential direction
Cross section contour shaping rule is identical or different.
In a further embodiment, the bus of the lower half guide ring is straightway, arc section, spline curve, no
Regular curve section or combinations thereof.
Another aspect according to the present utility model provides a kind of steam turbine discharge cylinder, comprising: interior steam discharge guide ring and outer
Steam discharge guide ring, wherein the interior steam discharge guide ring and outer steam discharge guide ring are steam turbine discharge guide ring as described above.
In a further embodiment, the steam turbine discharge cylinder further includes shell；Support construction is placed in described
In shell；Wherein, the interior steam discharge guide ring and outer steam discharge guide ring are placed in the support construction.
In a further embodiment, the steam turbine discharge cylinder is lower-discharging type steam turbine discharge cylinder.
(3) beneficial effect
Structure snd size of the utility model by optimization steam turbine discharge guide ring, the steam turbine discharge water conservancy diversion
Ring, comprising: upper half guide ring and lower half guide ring, the upper half guide ring and the lower half guide ring form ring-type；It is described to lead
The circumferential direction for flowing ring is cross-section or variable section structure；And the axial length of the lower half guide ring is greater than the axial direction of upper half guide ring
Length.It is designed in this way and static pressure recovery coefficient can be improved, improve 20 than (traditional exhaust casing static pressure recovery coefficient is 0%) before optimization
~30%, hence it is evident that the effective enthalpy drop for increasing unit increases the power output of unit, improves the thermal efficiency of unit, performance boost
Significantly.
Detailed description of the invention
Fig. 1 is the vertical section structure schematic diagram of steam turbine discharge cylinder；
Fig. 2 is the profilograph structural schematic diagram of traditional exhaust casing steam discharge guide ring；
Fig. 3 is traditional exhaust casing steam discharge guide ring from into structural schematic diagram in terms of vapour direction；
Fig. 4 is the profilograph structural schematic diagram of the utility model exhaust casing steam discharge guide ring；
Fig. 5 is the utility model exhaust casing steam discharge guide ring from into structural schematic diagram in terms of vapour direction.
Specific embodiment
For the purpose of this utility model, technical solution and advantage is more clearly understood, below in conjunction with specific embodiment, and
Referring to attached drawing, the utility model is described in further detail.
One embodiment according to the present utility model provides a kind of steam turbine discharge guide ring, comprising: upper half guide ring
With lower half guide ring, the upper half guide ring and the lower half guide ring form ring-type；The upper half guide ring and the lower half
Guide ring forms ring-type；The circumferential direction of the guide ring is variable section structure；And the axial length of the lower half guide ring is greater than upper
The axial length of half guide ring.
Wherein, the upper half guide ring and the lower half guide ring are unsymmetric structure, upper half guide ring axial cross section arc
Section is shorter, and condenser rear portion is entered after turning back convenient for exhaust passage upper steam diffusion；Lower half guide ring axial cross section segmental arc compared with
It is long, convenient for guidance exhaust passage lower steam diffusion and enter condenser front, lower half guide ring prolongation plays solidifying simultaneously
The effect of subregion before and after vapour device inlet steam is conducive to the uniformity for improving flow field.
In the present embodiment, the circumferential cross-section of the upper half guide ring is cross-section or variable cross-section；The upper half guide ring
Bus be straightway, arc section, irregular curve section or combinations thereof.
In the present embodiment, the circumferential cross-section of the lower half guide ring is cross-section or variable cross-section；The lower half guide ring
Bus be straightway, arc section, irregular curve section or combinations thereof.
In the present embodiment, the center of circle angle of the circumferential cross-section segmental arc 2-1 of the upper half guide ring is described less than 90 degree
The center of circle angle of the circumferential cross-section segmental arc 2-2 of lower half guide ring is less than or equal to 90 degree.
Another embodiment according to the present utility model provides a kind of steam turbine discharge cylinder, comprising: interior steam discharge guide ring
3 and outer steam discharge guide ring 2, wherein the interior steam discharge guide ring 3 and outer steam discharge guide ring 2 are upper any one described steam
Turbine discharge guide ring.
Wherein, the steam turbine discharge cylinder includes interior steam discharge guide ring 3 and outer steam discharge guide ring 2, and each steam discharge water conservancy diversion
Ring is above-mentioned steam discharge guide ring, and the shape and size parameter of steam discharge guide ring is calculated via optimization, is led by the steam discharge
It flows ring and promotes the exhaust casing working efficiency.
In the present embodiment, steam turbine discharge cylinder is lower-discharging type steam turbine discharge cylinder, further includes shell 1；Support
Structure 4 is placed in the shell 1；Wherein, the interior steam discharge guide ring 3 and outer steam discharge guide ring 2 are placed in the support construction 4
On.Technical solution disclosed in the utility model is further illustrated with reference to the accompanying drawing: as shown in Figure 1, being steam turbine discharge
Vertical section structure schematic diagram of cylinder, including shell 1, interior steam discharge guide ring 3, outer steam discharge guide ring 2, support construction 4 etc..The row
Cylinder realizes the steering and leaving velocity recycling of low pressure steam discharge for connecting steam turbine low-pressure channel and condenser.
It as shown in Figure 2 and Figure 3, is the structural schematic diagram of traditional exhaust casing steam discharge guide ring, outer guide ring is designed as up and down
Two halves are welded by 12 blocks of curved good steel plates respectively, and geometrical shapes are simple, upper and lower hemihedrism, static pressure recovery coefficient
It is lower, and flow unevenly, increase the vapour collateral resistance of condenser.
It as shown in Figure 4, Figure 5, is the structural schematic diagram of the steam discharge guide ring of the utility model, structure and above-mentioned tradition are arranged
Cylinder is similar and upper lower half guide ring is made of 12 pieces of curved good steel plate butt weldings respectively, the upper half guide ring and it is described under
Half guide ring forms ring-type.Difference is: upper lower half guide ring is unsymmetric structure, and the upper half guide ring and the lower half are led
Stream annular is circlewise；The circumferential direction of the guide ring is variable section structure, and circumferential cross-section contour line shaping rule is different；And it is described
The axial length of lower half guide ring is greater than the axial length of upper half guide ring.The shape and size parameter of inside and outside steam discharge guide ring
It is calculated by optimization, variable cross-section form is respectively adopted in upper half guide ring and lower half guide ring.Lower half and upper half structure are asymmetric,
Circumferential each section is different.Upper half guide ring is shorter, turns back convenient for upper steam diffusion into condenser rear portion, lower half guide ring
It is longer, for guiding lower steam diffusion and entering condenser front.
It should be noted that can provide the demonstration of the parameter comprising particular value herein, but these parameters are without being definitely equal to
Corresponding value, but analog value can be similar in acceptable error margin or design constraint.The direction mentioned in embodiment
Term, such as "upper", "lower", "front", "rear", "left", "right" etc. are only the directions with reference to attached drawing, are not used to limit this reality
With novel protection scope.In addition, unless specifically described or the step of must sequentially occur, there is no restriction for the sequence of above-mentioned steps
In listed above, and it can change or rearrange according to required design.And above-described embodiment can be based on design and reliability
The considerations of, the collocation that is mixed with each other is used using or with other embodiments mix and match, i.e., the technical characteristic in different embodiments can
To freely form more embodiments.
Particular embodiments described above has carried out into one the purpose of this utility model, technical scheme and beneficial effects
Step is described in detail, it should be understood that the foregoing is merely specific embodiment of the utility model, are not limited to this reality
With novel, within the spirit and principle of the utility model, any modification, equivalent substitution, improvement and etc. done should all include
It is within the protection scope of the utility model.
Claims (8)
1. a kind of steam turbine discharge guide ring characterized by comprising upper half guide ring and lower half guide ring, the upper half
Guide ring and the lower half guide ring form ring-type；The circumferential direction of the guide ring is cross-section or variable section structure；And it is described under
The axial length of half guide ring is greater than the axial length of upper half guide ring.
2. steam turbine discharge guide ring as described in claim 1, which is characterized in that the circumferential cross-section of the upper half guide ring
For cross-section or variable cross-section, circumferential cross-section contour line shaping rule is identical or different.
3. steam turbine discharge guide ring as claimed in claim 1 or 2, which is characterized in that the bus of the upper half guide ring
For straightway, arc section, spline curve, irregular curve section or combinations thereof.
4. steam turbine discharge guide ring as described in claim 1, which is characterized in that the circumferential cross-section of the lower half guide ring
For cross-section or variable cross-section, circumferential cross-section contour line shaping rule is identical or different.
5. steam turbine discharge guide ring as described in claim 1 or 4, which is characterized in that the bus of the lower half guide ring
For straightway, arc section, spline curve, irregular curve section or combinations thereof.
6. a kind of steam turbine discharge cylinder characterized by comprising interior steam discharge guide ring (3) and outer steam discharge guide ring (2),
In, the interior steam discharge guide ring (3) and outer steam discharge guide ring (2) they are such as the described in any item steam turbine rows of claim 1-5
Vapour guide ring.
7. steam turbine discharge cylinder as claimed in claim 6, which is characterized in that further include shell (1)；Support construction (4), sets
In the shell (1)；Wherein, the interior steam discharge guide ring (3) and outer steam discharge guide ring (2) are placed in the support construction (4)
On.
8. steam turbine discharge cylinder as claimed in claims 6 or 7, which is characterized in that the steam turbine discharge cylinder is lower row
Formula steam turbine discharge cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822169241.5U CN209293858U (en) | 2018-12-21 | 2018-12-21 | Steam turbine discharge guide ring and exhaust casing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822169241.5U CN209293858U (en) | 2018-12-21 | 2018-12-21 | Steam turbine discharge guide ring and exhaust casing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209293858U true CN209293858U (en) | 2019-08-23 |
Family
ID=67656116
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822169241.5U Active CN209293858U (en) | 2018-12-21 | 2018-12-21 | Steam turbine discharge guide ring and exhaust casing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209293858U (en) |
-
2018
- 2018-12-21 CN CN201822169241.5U patent/CN209293858U/en active Active
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