CN102635410A - Turbine medium-low pressure communication pipe structure - Google Patents
Turbine medium-low pressure communication pipe structure Download PDFInfo
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- CN102635410A CN102635410A CN2012101303515A CN201210130351A CN102635410A CN 102635410 A CN102635410 A CN 102635410A CN 2012101303515 A CN2012101303515 A CN 2012101303515A CN 201210130351 A CN201210130351 A CN 201210130351A CN 102635410 A CN102635410 A CN 102635410A
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Abstract
The invention discloses a turbine medium-low pressure communication pipe structure. A communication pipe is provided with a shutoff valve and a main control flow regulation valve, wherein the steam inlet side and steam outlet side of the main control flow regulation valve are communicated through a bypass branch pipe; and the bypass branch pipe is provided with a bypass flow control valve. The turbine medium-low pressure communication pipe structure realizes online disconnection or operation of a low-pressure module by controlling the on/off of the shutoff valve and the main control flow regulation valve so that a turboset can be flexibly switched between a straight condenser and a back pressure machine; meanwhile, the medium-low pressure communication pipe with the structure also can control the rotation speed of the low-pressure module through a bypass flow control valve on the bypass branch pipe to finish the start control on the low-pressure driving, thereby perfectly realizing online switch of back pressure-straight condensation operation modes of a back pressure unit, and improving the operation economical efficiency of a power plant; and the turbine medium-low pressure communication pipe structure also has the advantages that the unit structure is simplified and the system is compact and simple.
Description
Technical field
The present invention relates to steam turbine and make field, the mesolow cross over pipe structure of using on particularly a kind of steam turbine.
Background technique
The mesolow cross over pipe is a vitals of steam turbine; It is generally used for the steam turbine of multiaxis multi-cylinder; The entrance point of mesolow cross over pipe is connected intermediate pressure cylinder steam discharge afterbody; Outlet end is connected the inlet of low pressure (LP) cylinder, and the mesolow cross over pipe is a stream passageway of intermediate pressure cylinder exhaust steam water conservancy diversion being introduced low pressure (LP) cylinder.In the cogeneration unit, in order to satisfy the needed extraction pressure of hot user, generally need in steam flow channel, to be provided with the valve that can regulate aperture, with the gas flow in the control mesolow cross over pipe, steam regulation pressure is to the needed extraction pressure of user.
Along with the domestic and international energy is critical progressively nervous, the Economy of the unit that draws gas is required to improve day by day, the operating mode best for power plant is: make back pressure machine with unit winter, and with the low-pressure section excision, the intermediate pressure cylinder steam discharge is all as the heating load of heat supply-maximum unit; Make pure condensate machine with unit summer, and promptly conventional operation mode-unit generation is most effective.Yet the steam turbine of conventional configuration can't be realized the flexible switching of above-mentioned running state at present, will cause certain influence to the utilization efficiency of steam turbine like this.
Summary of the invention
To the deficiency of above-mentioned existing technology, the purpose of this invention is to provide a kind of steam turbine mesolow cross over pipe structure that steam turbine set is switched flexibly between pure condensate machine and back pressure machine.
For solving the problems of the technologies described above, the present invention adopts following technological scheme:
A kind of steam turbine mesolow cross over pipe structure; Comprise that one is used to connect the cross over pipe of high pressure module and low-voltage module; Said cross over pipe is provided with a master control flow control valve; The steam admission side of said master control flow control valve and steam output side are communicated with through a bypass arm, and said bypass branch is provided with a bypass flow control valve, and the valve port of said bypass flow control valve is less than said master control flow control valve.
Preferably, also be provided with a shut-off valve on the said cross over pipe.
Preferably, said shut-off valve is positioned at the side of said master control flow control valve near the high pressure module.
Technique scheme has following beneficial effect: this steam turbine mesolow cross over pipe structure is provided with shut-off valve and master control flow control valve on cross over pipe; Switch through control shut-off valve, master control flow control valve is realized the online off-the-line or the low-voltage module that puts into operation; Steam turbine set can be switched between pure condensate machine and back pressure machine flexibly; Also be provided with a small-bore bypass flow control valve on the master control flow control valve bypass branch of cross over pipe, the bypass flow control valve can accurately be controlled the rotating speed of low-voltage module, accomplishes the start-up control that low pressure is driven; Well solved the online switching problem of taking out back pressure unit back pressure-pure condensate operating mode; Improve power plant's performance driving economy, this steam turbine mesolow cross over pipe structure also has the set structure of simplification arranges, makes the simple and direct advantage of system compact.
Above-mentioned explanation only is the general introduction of technological scheme of the present invention, understands technological means of the present invention in order can more to know, and can implement according to the content of specification, below with preferred embodiment of the present invention and conjunction with figs. this patent is elaborated.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described in detail.
As shown in Figure 1; This steam turbine mesolow cross over pipe structure comprises that one is used to connect the cross over pipe 3 of high pressure module 1 and low-voltage module 2; On cross over pipe, be provided with a master control flow control valve 31, the steam admission side of master control flow control valve 31 and steam output side are communicated with through a bypass arm 32, and bypass branch 32 is provided with a bypass flow control valve 30; The valve port of bypass flow control valve is less than master control flow control valve 31, also is provided with a shut-off valve 33 at the master control flow control valve near a side of high pressure module.
Shut-off valve 33 is mainly used in the main steam passage of opening or cutting off cross over pipe 3; The valve port of bypass flow control valve 30 is less than master control flow control valve 31, so it is high to flow control accuracy, when starting low-voltage module 2, is used for accurately controlling stably the low pressure rotor raising speed; Master control flow control valve 31 is responsible for the throttle flow of control low-voltage module 2, regulates the pressure that draws gas of its extraction opening, perhaps controls the load of low-pressure section.
Adopt the steam turbine set of this steam turbine mesolow cross over pipe structure; In the winter time because the heating load (steam demand amount) that hot user needs is bigger; Can make all valves on the cross over pipe 3 be in closed condition this moment; So just can make low-voltage module 2 be in the excision state, and the steam discharge of high pressure module 1 all is used for heating with maximization unit heat energy utilization rate.And at non-heating period in summer, need unit is switched to the operation of pure condensate state, its concrete steps are: the shut-off valve 33 of at first opening front end; Then small-bore bypass flow control valve 30 is slowly opened; The control rotational speed of lower pressure turbine rotor steadily rises to 3000r/min, automatic and be in high school pressure rotor and the locking of low pressure rotor this moment through synchronous coupling, and then slowly master control flow control valve 31 is opened; Low-voltage module 2 can put into operation like this, accomplishes online switching.
Shut-off valve is set on cross over pipe this steam turbine mesolow cross over pipe structure and the master control flow control valve is realized the online off-the-line or the low-voltage module that puts into operation through the switch of control shut-off valve, master control flow control valve; Steam turbine set can be switched between pure condensate machine and back pressure machine flexibly; Also be provided with a small-bore bypass flow control valve on the bypass branch of cross over pipe master control flow control valve; The bypass flow control valve can accurately be controlled the rotating speed of low-voltage module; Accomplish the start-up control that low pressure is driven, well solved the online switching problem of taking out back pressure unit back pressure-pure condensate operating mode, improve power plant's performance driving economy; This steam turbine mesolow cross over pipe structure also has the set structure of simplification arranges, makes the simple and direct advantage of system compact.
More than a kind of steam turbine mesolow cross over pipe structure that the embodiment of the invention provided has been carried out detailed introduction; For one of ordinary skill in the art; According to the thought of the embodiment of the invention, the part that on embodiment and application area, all can change, in sum; This description should not be construed as limitation of the present invention, and all any changes of making according to design philosophy of the present invention are all within protection scope of the present invention.
Claims (3)
1. steam turbine mesolow cross over pipe structure; Comprise that one is used to connect the cross over pipe of high pressure module and low-voltage module; It is characterized in that: said cross over pipe is provided with a master control flow control valve; The steam admission side of said master control flow control valve and steam output side are communicated with through a bypass arm, and said bypass branch is provided with a bypass flow control valve, and the valve port of said bypass flow control valve is less than said master control flow control valve.
2. steam turbine mesolow cross over pipe structure according to claim 1 is characterized in that: also be provided with a shut-off valve on the said cross over pipe.
3. steam turbine mesolow cross over pipe structure according to claim 1 is characterized in that: said shut-off valve is positioned at the side of said master control flow control valve near the high pressure module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101303515A CN102635410A (en) | 2012-04-27 | 2012-04-27 | Turbine medium-low pressure communication pipe structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101303515A CN102635410A (en) | 2012-04-27 | 2012-04-27 | Turbine medium-low pressure communication pipe structure |
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| CN102635410A true CN102635410A (en) | 2012-08-15 |
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| CN2012101303515A Pending CN102635410A (en) | 2012-04-27 | 2012-04-27 | Turbine medium-low pressure communication pipe structure |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4373340A (en) * | 1979-07-25 | 1983-02-15 | Herbert Keller | Peak load device of a multistage turbine |
| JPH05296001A (en) * | 1992-04-22 | 1993-11-09 | Mitsubishi Heavy Ind Ltd | Steam pipeline |
| JPH07243304A (en) * | 1994-03-01 | 1995-09-19 | Fuji Electric Co Ltd | Extraction pressure control method for extraction turbine |
| CN101737098A (en) * | 2009-12-21 | 2010-06-16 | 上海电气电站设备有限公司 | Medium/low pressure communicating pipe steam extracting structure of straight condensing turbine |
| CN101761390A (en) * | 2008-12-22 | 2010-06-30 | 通用电气公司 | Method and systems for operating a combined cycle power plant |
| CN102140938A (en) * | 2011-03-18 | 2011-08-03 | 上海电气电站设备有限公司 | Double-cylinder coaxial combined cycle heat supply gas turbine |
| CN202081925U (en) * | 2011-06-10 | 2011-12-21 | 安徽省科捷再生能源利用有限公司 | Electricity and heat cogeneration system of straight condensing steam turbine set |
-
2012
- 2012-04-27 CN CN2012101303515A patent/CN102635410A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4373340A (en) * | 1979-07-25 | 1983-02-15 | Herbert Keller | Peak load device of a multistage turbine |
| JPH05296001A (en) * | 1992-04-22 | 1993-11-09 | Mitsubishi Heavy Ind Ltd | Steam pipeline |
| JPH07243304A (en) * | 1994-03-01 | 1995-09-19 | Fuji Electric Co Ltd | Extraction pressure control method for extraction turbine |
| CN101761390A (en) * | 2008-12-22 | 2010-06-30 | 通用电气公司 | Method and systems for operating a combined cycle power plant |
| CN101737098A (en) * | 2009-12-21 | 2010-06-16 | 上海电气电站设备有限公司 | Medium/low pressure communicating pipe steam extracting structure of straight condensing turbine |
| CN102140938A (en) * | 2011-03-18 | 2011-08-03 | 上海电气电站设备有限公司 | Double-cylinder coaxial combined cycle heat supply gas turbine |
| CN202081925U (en) * | 2011-06-10 | 2011-12-21 | 安徽省科捷再生能源利用有限公司 | Electricity and heat cogeneration system of straight condensing steam turbine set |
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Application publication date: 20120815 |