CN1221471A - Control arrangement and method for introducing overload steam into steam turbine - Google Patents
Control arrangement and method for introducing overload steam into steam turbine Download PDFInfo
- Publication number
- CN1221471A CN1221471A CN97195332A CN97195332A CN1221471A CN 1221471 A CN1221471 A CN 1221471A CN 97195332 A CN97195332 A CN 97195332A CN 97195332 A CN97195332 A CN 97195332A CN 1221471 A CN1221471 A CN 1221471A
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- China
- Prior art keywords
- steam
- turbine
- flow path
- valve
- control gear
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- 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
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Control Of Turbines (AREA)
Abstract
The invention relates to a control arrangement (1) for supplying steam of a steam turbine (11) with a main flow path (2) for steam. The main flow path (2) has a flow cross-section (12) which can be adjusted by at least one control valve (4). A secondary flow path (3) can be connected in a fluidic manner via the control valve (4) to the main flow path (2). The invention also relates to a method for introducing overload steam into a steam turbine (11), in which in a control valve (4) part of the fresh steam flow (19) is diverted and is supplied to a turbine stage (18) downstream of a control stage (18a).
Description
The present invention relates to a kind of control gear, be used for steam input one is had the steam turbine in steam main flow path, wherein be provided with a control valve, with the steam flow cross section in this control valve can regulate main flow path.The invention still further relates to and a kind of excess load steam is imported method in the steam turbine, this steam turbine has a plurality of turbine stages.
Steam turbine with partial admission designs like this: steam turbine can provide a performance number that exceeds the design power of its calculating instantaneously.The power of this raising is used to come with partial admission the steam turbine of work, as (" Dampfturbinen; Einfuehrung in Bau undBetrieb " Von Hans-Walter Roemer writing in the 1st, 7.3 and 7.4 joints in " the steam turbine structure is introduced with operation " book that Hans-Walter Roemer showed, Verlag W.Girardet, Essen, 1972).The partial admission of steam turbine will be realized by valve a plurality of parallel connections, that open in succession one by one, such one first turbine vane sheet series, that is governing stage, then available volume vapour that controllable new steam flow fills.These valves are connected with a shared valve rod, come opening of control valve in succession by the lift of valve rod.For reaching higher at short notice power, be provided with an overload valve additional, that be connected with valve rod.By this overload valve, a part of live steam directly is imported into the turbine stage of the whole admission that are positioned at the downstream under by the governing stage condition in bypass.The vapor stream flux that increases will be processed in less turbine stage, can produce the reduction of efficient thus, even this to be reduced in most occasions be seldom, but particularly by having increased the length of level subsequently, and raising that also can implementation efficiency.
The object of the present invention is to provide a kind of control gear, provide the part vapor stream, especially provide the part vapor stream for excess load steam is imported in the steam turbine with it.Another object of the present invention provides a kind of with the method in the excess load steam importing steam turbine.
This purpose at a kind of control gear is to realize by a kind of control gear that is used for the input of steam turbine steam according to the present invention, this control gear has the main flow path of a steam, this main flow path has a steam flow cross section, this cross section can be regulated by at least one modulating valve, by this modulating valve one auxilliary flow path and this primary flow path that provides for steam is directly coupled together fluid mechanics.
Can reach thus: the steam that directly flows out from primary flow path is branched to the auxilliary flow path.Such advantage is: adopt control gear and the overload valve that need not to add can will come from the steam of the new steam flow of steam turbine and carry out branch.Modulating valve can satisfy dual functions thus, that is: regulate the steam flow of steam turbine and introduce overload to improve turbine engine efficient.
When modulating valve was opened whole steam flow cross section equally fully, auxilliary flow path was also preferably opened fully.In the main flow path that is opened fully, therefore auxilliary flow path also all is full of by initial steam all the time, can reach a kind of lasting overload (power raising) so in this case.This point has advantage to the steam turbine that throttling is regulated especially.Can carry out in this case steam excess load importing is accommodated in the steam turbine drum of the turbine spindle that vane group is housed.
Do not realize excess load for not introducing excess load in the steam turbine of regulating in a throttling, both can improve initial steam pressure, perhaps in the time can not doing like this, can under the normal duty situation, carry out throttling.One 5% excess load, 5% the amount of restriction that requires in the case to have an appointment equally.This situation equals with respect to have an appointment 0.5% the deterioration of the heat rate of the steam turbine of the operation conditions of a no throttling.
Under the situation of opening the main flow path fully, that is the turbine blade group is being implemented to fill fully under the situation of vapour, can can under the excess load situation, make heat loss only cause very little deterioration (about 0.1%) control gear that excess load steam is introduced in the drum by a kind of with respect to a kind of embodiment of not having the excess load effect, but for the turbine of throttling about 5%, this deterioration can be eliminated at least under the normal duty situation.
Under the partial admission situation, that is under the steam flow cross section situation of be obstructed fully or to small part (by throttling), auxilliary stream is through being fully closed.Can guarantee thus: the steam that carries out for the introducing excess load only carries out when the steam turbine excess load is worked through the branch of auxilliary flow path.
In this control gear, modulating valve comprises a valve piston and a piston shell.This piston shell has a steam inlet pipe and that is branched off into valve piston from mainstream channel and is directed at the steam outlet pipe of auxilliary flow path from valve piston.This valve piston itself has an accessory channel, will carry out pipe by this accessory channel and be connected from fluid technique with steam outlet pipe, therefore also has been combined into a kind of excess load possibility in modulating valve, does not so need to install in addition an additional excess load valve.Can exempt the expense of additional design direction thus, especially the expense of the aspects such as space of Fu Jia pipeline and increase.When opening modulating valve fully, then can between main flow path and auxilliary flow path, form and be connected once the steam flow of going into steam pipe, accessory channel and steam outlet pipe.
In the valve piston that preferably extends along a main shaft, accessory channel is configured to one with respect to the rotational symmetric substantially annular pass of main shaft.Certainly this accessory channel also can have other structural form, such as center hole or as can be by the groove of piston closes in piston shell.
Modulating valve is preferably a diffusion valve, especially a single seat diffusion valve.This valve can be combined with a quick closing valve in the initial steam input of steam turbine.Valve piston can be processed into by a monoblock material with the valve rod on being connected it.Slip surface on valve rod and valve piston can be such as adopting the plasma arc method to close entirely in addition armouring with the Si Taili hard.Valve piston can be regulated through the single driver of a hydraulic type.
This control gear preferably by dosage on a steam turbine, especially be configured on the steam turbine of throttling adjusting, this steam turbine has a plurality of turbine stages, these turbine stages comprise moving vane series and a guide vane series separately, wherein first turbine stage that is the so-called governing stage that is positioned on the steam flow direction led in the main flow path, and auxilliary flow path then leads to a turbine stage that is positioned at the governing stage downstream.Therefore, have with the initial steam of the essentially identical steam condition of initial steam that flows into governing stage and directly sent into the turbine stage that another is positioned at the downstream by auxilliary flow path.Therefore in this turbine stage, the state of steam especially pressure and temperature is enhanced, and can reach the higher percussion of moving vane like this and is attended by the higher turbine power that causes therefrom.
Control gear preferably casts in together with the steam turbine turbine housing at least in part mutually.Also provide modulating valve, this modulating valve can directly be cast on the turbine housing for this reason, also has auxilliary flow path in addition, this path such as can be designed to be cast on the turbine housing or within an excess load pipeline.By at least in part this control gear being combined in the turbine housing, then can be the Mechanical Reliability that can adopt less design cost and Geng Gao and introduce excess load simple especially apparatus structure form is provided in a kind of design.Certainly also can with modulating valve with screw-driving on turbine housing and with the excess load pipeline be drilled in the turbine housing, welding or bolt be tightened on this turbine housing.
Thisly solve as follows according to the present invention: when fully opening a modulating valve at the task of being used for excess load steam is imported the method for steam turbine, by this modulating valve initial steam can by the throttling ground warp on the steam flow direction first turbine joint that is a main flow path of so-called governing stage be transfused to, this moment, auxilliary flow path was opened, and was branched and is imported into a turbine stage that is arranged in the modulating valve downstream by this path from modulating valve some vapor stream that comes out.Therefore modulating valve has a kind of dual functions, and it is used to regulate the initial steam amount of governing stage being filled vapour on the one hand, then can fill vapour to a turbine stage that also is positioned at the downstream in addition on the other hand.This is other fills that vapour preferably carries out and therefore can carry out complete admission to steam turbine when fully opening modulating valve.By this other admission, then in the turbine stage of subordinate, implement the importing of excess load steam, thereby improved the steam condition in this turbine stage, do the power that causes when full-load operation, improving steam turbine like this, can further compensate thus because of improving the thermal losses deficit that the steam soak amount occurs.
Below the embodiment shown in reference to the accompanying drawings further specifies control gear that is used for the input of steam turbine steam and the method that is used for importing excess load steam.In the accompanying drawing:
Fig. 1 one has the cross-sectional view of the steam turbine of the control gear that is molded into of part,
Fig. 2 be according to the amplification of Fig. 1 gained a local figure,
Fig. 3 is the longitudinal section of steam turbine along turbine spindle.
Fig. 1,2 and 3 for clarity sake is partly schematic and is disproportion.Same reference numerals used among the figure has same meaning respectively.
Fig. 1 illustrates a cross-sectional view of a steam turbine 11, and steam turbine 11 has a control gear 1, is used for the excess load of steam is imported 18 (see figure 3)s of a turbine stage that are positioned at one first turbine stage that is governing stage 18a downstream.This control gear 1 have two 9 that be connected with turbine housing, be cast into one or diffusion modulating valve 4 that tighten mutually with bolt, relative thirty years of age especially mutually.Each modulating valve 4 has one and comprises the piston shell 4b of this valve piston 4a along the valve piston 4a of main shaft 15 alignment and to small part.Valve piston 4a can move along main shaft 15 in valve chest 4b.By the pass by main flow path 2 of a steam of each modulating valve 4, be used for driving turbine 8 (see figure 3)s that are configured in turbine housing 9 and stretch along a turbine axis 20.In modulating valve 4, there is a steam flow cross section 12 in main flow path 2, and this cross section 12 can be regulated by valve piston 4a.Valve piston 4a has one as seen from Figure 2 and becomes rotational symmetric annular pass 7 substantially with main shaft 15.Piston shell 4b has one and is directed at the admission pipeline 13 of valve piston 4a from mainstream channel 2.Have a steam outlet pipe road 14 at a side upper piston housing 4b relative with admission pipeline 13, it leads to an auxilliary flow path 3.Should comprise that one extended in the excess load pipeline 6 in the turbine housing 9 by auxilliary flow path 3, this excess load pipeline 6 by casting in, punching in turbine housing 9, perhaps be designed to pipe and lead to the turbine stage 18 that (see figure 3) is configured in governing stage 18a downstream.Each turbine stage 18,18a respectively have the adjacent with it moving vane series 16 that is positioned at the downstream of guide vane series 17 and one.
Valve piston 4a moves along main shaft 15 according to the watt level of required steam turbine 11 through a not shown adjusting drive unit, 12 in steam flow cross section allows the initial steam 19 of a respective streams flux to enter in the steam turbine 11 like this, when fully opening steam flow cross section 12, valve piston 4a is positioned at and maybe can prolongs main shaft 15 on the position and move to such position, and admission this moment pipeline 13 accessory channel 7 through being configured to the annular pass links to each other on steam flow with steam outlet pipe road 14.The part steam flow of using the steam 19 of autonomous flow path 2 thus is imported into auxilliary flow path 3, introduces excess load steam thereby reach.Initial steam stream 19 comes out to be imported into a turbine stage 18 that is arranged in the downstream in addition through excess load pipeline 6 (see figure 3)s from modulating valve 4 like this.This initial steam 19 causes this turbine stage 18 and another to be positioned at the raising of the turbine stage throttle flow in downstream, and causes the raising of steam turbine 11 power thus.If steam flow cross section 12 all or to small part is blocked by valve piston 4b, then the contact of the steam flow between main flow path 2 and the auxilliary flow path 3 is interrupted.
Salient point of the present invention is to have a control gear, therein be used for regulating in the modulating valve of the initial steam amount that flows into steam turbine, in addition with part steam flow branch and excess load imported a turbine stage that is configured in the downstream from this initial steam stream.With less design cost and adopt special compact structure form when steam turbine is carried out whole admission, to realize a kind of running overload.The part of control gear, as modulating valve and excess load pipeline, can be in turbine housing by casting.By this overladen importing, can the heat loss deficit that can produce when the throttle operation be compensated.
Claims (10)
1. a control gear (1), be used for steam is imported a steam turbine (11), this steam turbine (11) has the main flow path (2) of a modulating valve (4) and a steam, this main flow path (2) has a steam flow cross section (12), this cross section (12) can be regulated by modulating valve (4), it is characterized in that: be provided with an auxilliary flow path (3) that is used for steam, this auxilliary flow path (3) is connected on steam flow with main flow path (2) through modulating valve (4).
2. control gear as claimed in claim 1 (1), wherein, in case modulating valve (4) is all decontroled steam flow cross section (12), then auxilliary flow path is all opened.
3. control gear as claimed in claim 1 or 2 (1), wherein, when modulating valve (4) all or was at least in part blocked steam flow cross section (12), auxilliary flow path (3) was by Close All.
4. as the described control gear of above-mentioned each claim (1), wherein, described modulating valve (4) comprises a valve piston (4a) and a piston shell (4b), wherein piston shell (4b) has one and is branched off into the steam outlet pipe road (14) of admission pipeline (13) and from valve piston (4a) to auxilliary flow path (3) of valve piston (4a) from main flow path (2), and valve piston (4a) has an accessory channel (7), by this accessory channel (7) admission pipeline (13) is connected on steam flow with steam outlet pipe road (14).
5. control gear as claimed in claim 4 (1), wherein, described valve piston (4a) stretches and accessory channel (7) is one to become rotational symmetric annular pass substantially with main shaft (15) along a main shaft (15).
6. as the described control gear of above-mentioned each claim (1), wherein, described modulating valve (5) is a diffusion valve.
7. as the described control gear (1) that particularly is positioned on the steam turbine that a throttling regulates of above-mentioned each claim, it has and comprises a plurality of turbine stages (18 separately, moving vane series (16) 18a) and a guide vane series (17), wherein, first turbine stage (18a) on the steam flow direction is led to and auxilliary flow path (3) leads to a turbine stage (18) that is configured in first turbine stage (18a) downstream in described main flow path (2).
8. as the described control gear of above-mentioned each claim (1), it at least in part by casting, be welded in or bolt is screwed on the turbine housing (9) of steam turbine (11).
9. as claim 7 or 8 described control gear (1), wherein, described auxilliary flow path (3) have one by casting, boring, bolt is tightened in or be welded on excess load pipeline (6) on the turbine housing (9).
10. method that is used for excess load steam is imported steam turbine (11), this steam turbine (11) has and comprises a plurality of turbine stages (18 separately, moving vane series (16) 18a) and a guide vane series (17), wherein, when opening modulating valve (5) fully, initial steam through this valve (5) but throttling ground warp one main flow path (2) is transfused to first turbine stage (18a) on the steam flow direction, one auxilliary flow path (3) is opened, through branching out a part of steam flow and be transfused to a turbine stage (18) that is positioned at first turbine stage (18a) downstream from modulating valve (5) by auxilliary flow path (3).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19616837.6 | 1996-04-26 | ||
| DE19616837 | 1996-04-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1221471A true CN1221471A (en) | 1999-06-30 |
Family
ID=7792600
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97195332A Pending CN1221471A (en) | 1996-04-26 | 1997-04-14 | Control arrangement and method for introducing overload steam into steam turbine |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0894184A1 (en) |
| JP (1) | JP2000509457A (en) |
| KR (1) | KR20000065026A (en) |
| CN (1) | CN1221471A (en) |
| CZ (1) | CZ296898A3 (en) |
| PL (1) | PL329155A1 (en) |
| WO (1) | WO1997041335A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101094971B (en) * | 2004-11-02 | 2011-03-09 | 阿尔斯托姆科技有限公司 | Optimised turbine stage for a turbine engine and layout method |
| CN104675457A (en) * | 2013-11-05 | 2015-06-03 | 三菱日立电力系统株式会社 | Steam turbine equipment |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1245853A (en) * | 1999-07-06 | 2000-03-01 | 赫思厘 | Forward-flushing water closet |
| JP2010048216A (en) * | 2008-08-25 | 2010-03-04 | Fuji Electric Systems Co Ltd | Main steam inlet part of steam turbine |
| JP5411087B2 (en) * | 2010-08-12 | 2014-02-12 | 株式会社日立製作所 | Steam turbine valve device and operation method thereof |
| EP2781690A1 (en) * | 2013-03-20 | 2014-09-24 | Siemens Aktiengesellschaft | Valve for a steam turbine |
| EP3128136A1 (en) * | 2015-08-07 | 2017-02-08 | Siemens Aktiengesellschaft | Overload feed into a steam turbine |
| DE102016215770A1 (en) * | 2016-08-23 | 2018-03-01 | Siemens Aktiengesellschaft | Outflow housing and steam turbine with discharge housing |
| CN113700534A (en) * | 2021-08-31 | 2021-11-26 | 中国船舶重工集团公司第七0三研究所 | High-power ship steam turbine external bypass cylinder |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR965789A (en) * | 1950-09-21 | |||
| FR404495A (en) * | 1909-06-26 | 1909-12-02 | Pokorny & Wittekind Maschb Ag | Low pressure steam turbine comprising two partial turbines mounted on the same shaft |
| CH211167A (en) * | 1939-06-15 | 1940-08-31 | Escher Wyss Maschf Ag | Multi-stage steam or gas turbine, the first stage gradient of which is subcritical and to which additional working fluid is supplied to increase the efficiency. |
| CH583371A5 (en) * | 1975-04-30 | 1976-12-31 | Bbc Brown Boveri & Cie | |
| JPS5564405U (en) * | 1978-10-27 | 1980-05-02 | ||
| AU537607B2 (en) * | 1980-12-02 | 1984-07-05 | Hitachi Limited | Combined valve for use in a reheating steam turbine |
| US4403476A (en) * | 1981-11-02 | 1983-09-13 | General Electric Company | Method for operating a steam turbine with an overload valve |
| US4753077A (en) * | 1987-06-01 | 1988-06-28 | Synthetic Sink | Multi-staged turbine system with bypassable bottom stage |
-
1997
- 1997-04-14 EP EP97922832A patent/EP0894184A1/en not_active Withdrawn
- 1997-04-14 KR KR1019980708570A patent/KR20000065026A/en not_active Application Discontinuation
- 1997-04-14 JP JP9538447A patent/JP2000509457A/en active Pending
- 1997-04-14 WO PCT/DE1997/000748 patent/WO1997041335A1/en not_active Application Discontinuation
- 1997-04-14 PL PL97329155A patent/PL329155A1/en unknown
- 1997-04-14 CZ CZ982968A patent/CZ296898A3/en unknown
- 1997-04-14 CN CN97195332A patent/CN1221471A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101094971B (en) * | 2004-11-02 | 2011-03-09 | 阿尔斯托姆科技有限公司 | Optimised turbine stage for a turbine engine and layout method |
| CN104675457A (en) * | 2013-11-05 | 2015-06-03 | 三菱日立电力系统株式会社 | Steam turbine equipment |
| CN104675457B (en) * | 2013-11-05 | 2016-09-28 | 三菱日立电力系统株式会社 | Steam turbine installation |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20000065026A (en) | 2000-11-06 |
| JP2000509457A (en) | 2000-07-25 |
| PL329155A1 (en) | 1999-03-15 |
| EP0894184A1 (en) | 1999-02-03 |
| WO1997041335A1 (en) | 1997-11-06 |
| CZ296898A3 (en) | 1999-02-17 |
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| WD01 | Invention patent application deemed withdrawn after publication |