CN109790752B - Device for introducing an additional mass flow into a main mass flow - Google Patents
Device for introducing an additional mass flow into a main mass flow Download PDFInfo
- Publication number
- CN109790752B CN109790752B CN201780058021.0A CN201780058021A CN109790752B CN 109790752 B CN109790752 B CN 109790752B CN 201780058021 A CN201780058021 A CN 201780058021A CN 109790752 B CN109790752 B CN 109790752B
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- Prior art keywords
- wall
- mass flow
- axis
- slot
- bore
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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
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
- F01D17/105—Final actuators by passing part of the fluid
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- 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
- F01D1/00—Non-positive-displacement machines or engines, e.g. steam turbines
- F01D1/02—Non-positive-displacement machines or engines, e.g. steam turbines with stationary working-fluid guiding means and bladed or like rotor, e.g. multi-bladed impulse steam turbines
- F01D1/023—Non-positive-displacement machines or engines, e.g. steam turbines with stationary working-fluid guiding means and bladed or like rotor, e.g. multi-bladed impulse steam turbines the working-fluid being divided into several separate flows ; several separate fluid flows being united in a single flow; the machine or engine having provision for two or more different possible fluid flow paths
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- 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
- F01D9/04—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector
- F01D9/048—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector for radial admission
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2220/00—Application
- F05D2220/30—Application in turbines
- F05D2220/31—Application in turbines in steam turbines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2260/00—Function
- F05D2260/60—Fluid transfer
- F05D2260/606—Bypassing the fluid
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention relates to a device (1) for introducing an additional mass flow into a main mass flow, wherein the main mass flow flows along an axis of rotation, wherein the feed line and the axis of rotation are formed at an angle to one another.
Description
Technical Field
The invention relates to a device for introducing an additional mass flow into a main mass flow, comprising a rotor which is mounted so as to be rotatable about a rotational axis and on which turbine rotor blades are arranged in the circumferential direction, wherein a plurality of rotor blade rows which are formed one after the other in the rotational direction are provided, and further comprising a housing which is arranged around the rotor.
Background
Steam power plants usually comprise at least one steam generator and a steam turbine which is supplied with live steam from the steam generator. In this case, the steam from the steam generator flows via a live steam line into a live steam inflow of the steam turbine. Control valves and regulating valves are usually provided in the live steam line. The control valve regulates the steam mass flow in the steam line. The quick-closing valve closes the steam supply to the steam turbine, which may be necessary, for example, in the event of a malfunction.
There are operating modes of the steam turbine which require the introduction of an additional mass flow into the steam turbine. This additional mass flow can be used to increase the power. By means of this additional feed, further steam can be introduced into the region downstream of the first blade. However, undesirable fluid-mechanical processes can then occur in this load point. The additional mass flow disturbs the main mass flow when entering the steam turbine, which is lost due to the mixing of the main mass flow and the additional mass flow. Furthermore, the main mass flow is deflected by the additional mass flow, which may cause: the blade assembly cannot be optimally incident to the flow.
Furthermore, the line guides of the steam lines of the additional mass flow can be disadvantageously designed such that disturbances in the upstream line system propagate downstream and thus cause the propagation of disturbances by the additional feed of steam into the steam turbine.
Disclosure of Invention
The object of the invention is to provide a device by means of which the additional mass flow can be mixed better with the main mass flow.
This object is achieved by a device for introducing an additional mass flow into a main mass flow, having a rotor which is mounted so as to be rotatable about an axis of rotation and on which turbine rotor blades are arranged in the circumferential direction, wherein a plurality of rotor blade rows which are formed one behind the other in the direction of rotation are provided, and having a housing which is arranged around the rotor, wherein a slot is provided in the housing between two blade rows, wherein the slot is connected to an inlet line in a fluid-conducting manner, wherein the inlet line and the axis of rotation form an angle α with respect to each other, wherein α ≦ 90 ° is applicable, wherein the slot has an outer slot wall which is inclined with respect to the axis of rotation and which is located downstream with respect to the flow direction, wherein the slot has an inner slot wall which is inclined with respect to the axis of rotation and which is located upstream with respect to the flow direction, wherein the blades of the blade rows which are arranged upstream of the inner slot wall have a blade length L, wherein the outer slot wall has a length H, wherein 0.3 × L ≦ 1.5L is applicable.
Advantageous refinements are specified in the following description.
The features of the embodiments can be combined with one another in any desired manner.
In a further advantageous development, the supply line is a bore hole with a diameter D, wherein the distance between the outer wall and the inner wall is B, wherein the following applies: d is less than or equal to B and less than or equal to 2X D.
In a further advantageous development, the outer wall and the bore are arranged at an angle β to one another, wherein an angle of-60 ° < β <60 ° applies.
In a further advantageous development, an edge having a length Y is formed between the outer wall and the bore.
In a further advantageous development, the edge is formed perpendicular to the drilling axis of the bore hole.
In a further advantageous refinement, the edge is inclined by ± 60 ° with respect to a perpendicular to the drilling axis of the bore hole.
In a further advantageous development, the inner wall and the bore are arranged at an angle γ with respect to one another, wherein the following applies: -90 ° < γ <90 °.
In a further advantageous development, the outer wall is at a distance E from the downstream blade row, wherein the following applies: 0< E <0.5 x L.
In a further advantageous development, the inner wall is at a distance F from the upstream blade row, wherein the following applies: 0< F <0.5 x L.
The above features, characteristics and advantages of the present invention and the manner of attaining them will become more apparent and the invention will be better understood by reference to the following description of embodiments of the invention taken in conjunction with the accompanying drawings, which are set forth in greater detail.
Drawings
Embodiments of the invention are described below with reference to the accompanying drawings. The figures do not show the embodiments to scale, but rather the figures for illustration are illustrated in schematic and/or slightly distorted form.
For a supplement to the teaching directly visible in the figures, see the relevant prior art.
The figures show:
fig. 1 shows a schematic view of the device.
Detailed Description
Fig. 1 shows a schematic view of a device for introducing an additional mass flow into a main mass flow.
The device 1 further comprises a rotor (not shown) mounted so as to be rotatable about an axis of rotation (not shown), on which rotor blades of a turbine are arranged in the circumferential direction, in fig. 1 the flow direction 2 of the main mass flow is shown, downstream of the flow direction 2, one blade 3 is shown symbolically, upstream of the flow direction 2, a further blade 4 is shown symbolically, these blades 3 and 4 can be rotor blades or guide blades and are arranged on the surface in the circumferential direction of the rotor, wherein a plurality of rows of rotor blades are provided which are formed one after the other in the direction 5 of the axis of rotation, the device 1 serves to mix the additional mass flow 6 with the main mass flow 7, the device 1 is designed as a bore 8 into the casing of the steam turbine (not shown), the bore 8 opens into a groove 9 arranged in the casing, the groove 9 comprises an outer wall 10 which delimits the groove 9 downstream in the direction 2 of the flow direction, the groove 9 has an inner wall 11 which is arranged upstream of the flow direction 2 and delimits the groove 9 in the direction of the upstream direction 8, the inner wall 10 is designed as a bore 8, and the inner wall 11 is designed as a bore length of the flow direction H, 8 is designed as a bore angle, 8 is applicable to the length of the flow direction of the adjacent to the flow direction of the inner wall, 8, 3, 8.
The bore hole 8 has a diameter D. The distance between the outer wall 10 and the inner wall 11 is B. The following is applicable: d is less than or equal to B and less than or equal to 2X D.
The outer wall 10 and the bore hole 8 are arranged at an angle β to each other-60 ° < β <60 ° is suitable.
In fig. 1, this relationship is schematically illustrated by the enlarged portion of the circle (at the upper left in fig. 1). The edge 12 has a length Y. The edge 12 is oriented perpendicular to the drilling direction 13 of the bore hole 8. As shown in the upper left circular portion of fig. 1, the edge 12 can also be formed obliquely. The reference numeral 14 indicates a perpendicular relative to the drilling direction 13. The edge 12 is inclined at an angle δ to the vertical 14. The angle δ can take a value between-60 ° and 60 °.
In fig. 1, the relationship between the bore hole 8 and the inner wall 11 is shown in the upper right circular portion. The inner wall 11 can be formed obliquely to the bore 8. An angle γ is formed between the bore hole 8 and the inner wall 11. The angle gamma can take a value between-90 deg. and 90 deg.. The outer wall 10 is at a distance E from the downstream row of rotor blades (formed by the blades 3). The following is applicable: 0< E < L. In alternative embodiments, the following applies: 0< E <0.5 x L.
The inner wall 11 is at a distance F from the upstream row 4 of rotor blades. The following is applicable: 0< F < L. In an alternative embodiment, the following applies: 0< F <0.5 x L.
The aim of the invention is to provide a particularly slow supply of the additional mass flow to the main mass flow, the bore holes 8 are designed in this case such that the additional mass flow flows into the blade path with a minimum velocity, however, for production reasons, the maximum bore hole size is limited, and therefore, a circumferential groove 9 is introduced into the housing, the groove 9 has a height which is 30% to 150% of the blade height L downstream thereof, and furthermore, the groove extends in a direction perpendicular to the bore hole direction 13 with one to two bore hole diameters, the downstream, laterally outward-oriented side of the groove 9 runs parallel to the bore hole direction 13 or is inclined up to ± 60 °, the upstream, outwardly-oriented side Z likewise runs parallel to the bore hole axis or is inclined up to ± 90 ° relative to the bore hole direction 13, or is inclined within one revolution by ± 60 ° relative to the perpendicular 14 to the bore hole direction 13, the bore holes 8 can likewise be inclined radially or to the greatest possible extent, in order to improve the introduction of the steam in the main mass flow direction at an angle α, and the downstream distance of the vane height of 0% to 50 ° L, 3% of the blade height L, and 50%.
The fluid-mechanical effect is fully utilized by the surrounding slot 9, by the way the slot 9 is wider than the bore hole 8, the slot 9 acts as a sudden expansion diffuser (Sto β diffuser), whereby the flow velocity is slowed down when mixing the two flows, the disturbance with the loss is smaller and the main mass flow is reduced, furthermore, when leaving the bore hole 8, mixing takes place inside the slot 9 in the circumferential direction, which also causes an interaction of the two steam flows, which thus are reduced, the way between the blades 3, 4 and the bore hole 8, when the two flows merge, the slot acts as a damping, again with smaller losses and less disturbance of the main flow, seen in the radial direction through the slot 9.
Although the invention has been illustrated and described in more detail in the detailed description of the preferred embodiments, the invention is not limited to the disclosed examples and other variants can be derived therefrom by those skilled in the art without departing from the scope of the invention.
Claims (9)
1. A device (1) for introducing an additional mass flow into a main mass flow, having a rotor which is mounted so as to be rotatable about an axis of rotation and on which turbine rotor blades are arranged in the circumferential direction,
wherein a plurality of rotor blade rows are provided which are formed one after the other in the direction of the axis of rotation (5),
the device also has a housing disposed about the rotor,
wherein a slot (9) is provided in the housing between the two rotor blade rows, wherein the feed line is designed as a bore (8) in the housing and opens into the slot (9), wherein the slot is wider than the bore, and the slot (9) comprises an outer wall (10) and an inner wall (11),
wherein the tank (9) is in fluid connection with the inlet line,
wherein the inlet line and the axis of rotation form an angle α with each other,
α <90 DEG, wherein the groove (9) has an outer groove wall which is inclined relative to the axis of rotation and which is located downstream relative to the flow direction,
wherein the groove (9) has an inner groove wall which is inclined relative to the axis of rotation and which is located upstream relative to the flow direction,
wherein the blades (3, 4) of the blade rows arranged upstream of the inner groove wall have a blade length L,
wherein the outer slot wall has a length H,
wherein the inner slot wall has a length Z,
among them, the following are applicable: 0.3 × L ≦ H ≦ 1.5 × L, wherein an edge (12) having a length Y is formed between the outer wall (10) and the bore (8).
2. The device (1) according to claim 1,
wherein the outer wall (10) and the bore (8) are arranged at an angle β to each other, wherein-60 ° < β <60 ° applies.
3. The device (1) according to claim 1,
the edge (12) is formed perpendicular to the drilling axis of the drill hole (8).
4. The device (1) according to claim 1,
wherein the edge (12) is inclined by +/-60 DEG relative to a perpendicular to the drilling axis of the drill hole (8).
5. The device of any one of claims 1 to 4,
wherein the inner wall (11) and the bore (8) are arranged at an angle γ with respect to each other, wherein the following applies: -90 ° < γ <90 °.
6. The device of any one of claims 1 to 4,
wherein the outer wall (10) is at a distance E from the downstream row of rotor blades, wherein the following applies: 0< E < L.
7. The device of any one of claims 1 to 4,
wherein the outer wall (10) is at a distance E from the downstream row of rotor blades, wherein the following applies: 0< E <0.5 x L.
8. The device of any one of claims 1 to 4,
wherein the inner wall (11) is at a distance F from the upstream row of rotor blades, wherein the following applies: 0< F < L.
9. The device of any one of claims 1 to 4,
wherein the inner wall (11) is at a distance F from the upstream row of rotor blades, wherein the following applies: 0< F <0.5 x L.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP16189690.7 | 2016-09-20 | ||
| EP16189690.7A EP3296506A1 (en) | 2016-09-20 | 2016-09-20 | Assembly for feed of an additional mass flow into a main mass flow |
| PCT/EP2017/073408 WO2018054811A1 (en) | 2016-09-20 | 2017-09-18 | Assembly for feeding an additional mass flow into a main mass flow |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109790752A CN109790752A (en) | 2019-05-21 |
| CN109790752B true CN109790752B (en) | 2020-06-09 |
Family
ID=56979417
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201780058021.0A Active CN109790752B (en) | 2016-09-20 | 2017-09-18 | Device for introducing an additional mass flow into a main mass flow |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3296506A1 (en) |
| CN (1) | CN109790752B (en) |
| WO (1) | WO2018054811A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3561238A1 (en) * | 2018-04-26 | 2019-10-30 | Siemens Aktiengesellschaft | Assembly for a steam turbine |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103423111A (en) * | 2012-05-24 | 2013-12-04 | 阿尔斯通技术有限公司 | Steam Rankine cycle solar plant and method for operating such plants |
| CN203809061U (en) * | 2012-10-16 | 2014-09-03 | 通用电气公司 | Steam turbine |
| EP2781690A1 (en) * | 2013-03-20 | 2014-09-24 | Siemens Aktiengesellschaft | Valve for a steam turbine |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2269235A (en) * | 1939-12-22 | 1942-01-06 | Gen Electric | Multistage elastic fluid turbine |
| US6783321B2 (en) * | 2002-11-06 | 2004-08-31 | General Electric Company | Diffusing coupling cover for axially joined turbines |
| US6854954B2 (en) * | 2003-03-03 | 2005-02-15 | General Electric Company | Methods and apparatus for assembling turbine engines |
| US8152437B2 (en) * | 2008-03-10 | 2012-04-10 | General Electric Company | Interface member for a power plant |
| JP6285692B2 (en) * | 2013-11-05 | 2018-02-28 | 三菱日立パワーシステムズ株式会社 | Steam turbine equipment |
-
2016
- 2016-09-20 EP EP16189690.7A patent/EP3296506A1/en not_active Withdrawn
-
2017
- 2017-09-18 CN CN201780058021.0A patent/CN109790752B/en active Active
- 2017-09-18 WO PCT/EP2017/073408 patent/WO2018054811A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103423111A (en) * | 2012-05-24 | 2013-12-04 | 阿尔斯通技术有限公司 | Steam Rankine cycle solar plant and method for operating such plants |
| CN203809061U (en) * | 2012-10-16 | 2014-09-03 | 通用电气公司 | Steam turbine |
| EP2781690A1 (en) * | 2013-03-20 | 2014-09-24 | Siemens Aktiengesellschaft | Valve for a steam turbine |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2018054811A1 (en) | 2018-03-29 |
| CN109790752A (en) | 2019-05-21 |
| EP3296506A1 (en) | 2018-03-21 |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20220818 Address after: Munich, Germany Patentee after: Siemens energy Global Ltd. Address before: Munich, Germany Patentee before: SIEMENS AG |
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| TR01 | Transfer of patent right |