CN206769966U - Small turbine low pressure steam-supplying system - Google Patents
Small turbine low pressure steam-supplying system Download PDFInfo
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- CN206769966U CN206769966U CN201720629596.0U CN201720629596U CN206769966U CN 206769966 U CN206769966 U CN 206769966U CN 201720629596 U CN201720629596 U CN 201720629596U CN 206769966 U CN206769966 U CN 206769966U
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- 230000000740 bleeding effect Effects 0.000 description 3
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Abstract
It the utility model is related to power plant field, disclose a kind of small turbine low pressure steam-supplying system, it is characterized in that, the small turbine low pressure steam-supplying system includes small turbine (1, 1 ') the main steam turbine level Four extraction line (2 and with the small turbine connected, 2 ') and auxiliary steam pipeline (3, 3 '), the main steam turbine level Four extraction line (2, 2 ') the first electric gate valve (4 is provided with, 4 '), the auxiliary steam pipeline (3, 3 ') the second electric gate valve (6 is disposed with along steam flow direction, 6 ') and fast opening butterfly valve (7, 7 ').Vapour source can be switched fast as auxiliary steam by small turbine low pressure steam-supplying system of the present utility model, avoid small turbine from tripping；When containing two small turbines, unit normal operation, two small turbine vapour sources are drawn gas steam supply by main steam turbine level Four, once break down, it can be switched fast as auxiliary steam steam supply, both ensure that the safe operation of unit, and significantly improved the economy of unit again.
Description
Technical field
It the utility model is related to power plant field, and in particular to a kind of small turbine low pressure steam-supplying system.
Background technology
Prime mover for functioning as driving feed pump of small turbine.Two 50% capacity of usual every crew qiting
Small turbine, two small turbine paired runnings.Small turbine has two-way low pressure vapour source, is taken out all the way for the main steam turbine fourth stage
Vapour, another way are auxiliary steam.During unit normal operation, drawn gas steam supply by the level Four of main steam turbine；Unit starting and underload
When by Auxiliary Steam steam supply.
It is electric gate valve that level Four, which is drawn gas with auxiliary steam to small turbine low pressure admission isolating valve, and opening and closing time is longer
(about 120s).During unit normal operation, drawn gas steam supply by main steam turbine level Four, the electric gate valve standard-sized sheet that level Four is drawn gas, auxiliary is steamed
The electric gate valve of vapour is fully closed.When main steam turbine level Four steam bleeding system breaks down suddenly, or the vapour source that level Four is drawn gas can not meet
, it is necessary to open auxiliary steam to the electric gate valve of small turbine steam supply when small turbine operation needs, and during electric gate valve unlatching
Between it is longer, it is impossible to carry out vapour source and safely and fast switch, may result in small turbine tripping operation, or even compressor emergency shutdown can be caused, deposited
In larger security risk.To ensure unit safety, during unit normal operation, a usual small turbine is drawn gas steam supply by level Four,
Another small turbine is by auxiliary steam steam supply, hence it is evident that reduces the economy of unit.
Utility model content
The purpose of this utility model is to overcome the economy of small turbine low pressure steam-supplying system existing for prior art
A kind of the problem of bad, there is provided small turbine low pressure steam-supplying system.
To achieve these goals, the utility model provides a kind of small turbine low pressure steam-supplying system, wherein, the small vapour
Turbine low pressure steam-supplying system includes small turbine and the main steam turbine level Four extraction line that is connected with the small turbine and auxiliary
Jet chimney is helped, is provided with the first electric gate valve on the main steam turbine level Four extraction line, edge on the auxiliary steam pipeline
Steam flow direction is disposed with the second electric gate valve and fast opening butterfly valve.
Preferably, the fast opening butterfly valve is to open Pneumatic butterfly valve soon.
Preferably, between first electric gate valve and the small turbine and in the fast opening butterfly valve and described small
Check-valves is provided between steam turbine.
Preferably, low pressure main inlet throttle-stop valve is additionally provided between the check-valves and the small turbine.
Preferably, it is additionally provided with low pressure pitch between the low pressure main inlet throttle-stop valve and the small turbine.
Preferably, the small turbine low pressure steam-supplying system includes two small turbines.
Preferably, the small turbine low pressure steam-supplying system also includes boiler and corresponded with the small turbine to connect
Feed pump, the feed pump connects with the boiler respectively.
Small turbine low pressure steam-supplying system of the present utility model increases fast opening butterfly valve on auxiliary steam pipeline, can be by vapour
Source is switched fast as auxiliary steam, avoids small turbine from tripping；When containing two small turbines, unit normal operation, two
Small turbine vapour source is drawn gas steam supply by main steam turbine level Four, once main steam turbine level Four steam bleeding system breaks down suddenly, or
When the vapour source that main steam turbine level Four is drawn gas can not meet that small turbine runs needs, fast opening butterfly valve can be quickly opened, is switched fast
For auxiliary steam steam supply, the safe operation of unit had both been ensure that, has significantly improved the economy of unit again.
Brief description of the drawings
Fig. 1 is a kind of small turbine low pressure steam-supplying system of embodiment of the present utility model.
Description of reference numerals
1,1 ' small turbines；2,2 ' main steam turbine level Four extraction lines；
3,3 ' auxiliary steam pipelines；4,4 ' first electric gate valves；
5,5 ' check-valves；6,6 ' second electric gate valves；
7,7 ' fast opening butterfly valves；8,8 ' low pressure main inlet throttle-stop valves；
9,9 ' low pressure pitch；10,10 ' feed pumps；
11 boilers.
Embodiment
The utility model provides a kind of small turbine low pressure steam-supplying system, wherein, as shown in figure 1, the small turbine is low
Pressure steam-supplying system include small turbine 1,1 ' and the main steam turbine level Four extraction line 2,2 ' that is connected with the small turbine and
Auxiliary steam pipeline 3,3 ', the first electric gate valve 4,4 ' is provided with the main steam turbine level Four extraction line 2,2 ', it is described auxiliary
Help on jet chimney 3,3 ' and be disposed with the second electric gate valve 6,6 ' and fast opening butterfly valve 7,7 ' along steam flow direction.
In the utility model, the fast opening butterfly valve 7,7 ' can be achieved to be switched fast auxiliary steam.Preferably, it is described to open butterfly soon
Valve 7,7 ' is to open Pneumatic butterfly valve soon.
In the utility model, to the structure of the fast opening butterfly valve 7,7 ', there is no particular limitation, as long as can realize quick
Switch auxiliary steam, it is preferable that the fast opening butterfly valve 7,7 ' is three eccentric metal hard sealed butterfly damper.
In the utility model, in order to prevent the gas in level Four bleed steam pipework and auxiliary steam pipeline from flowing back, preferable case
Under, between first electric gate valve 4,4 ' and the small turbine 1,1 ' and in the fast opening butterfly valve 7,7 ' and described small
Check-valves 5,5 ' is provided between steam turbine 1,1 '.
According to a kind of preferred embodiment of the present utility model, the check-valves 5,5 ' and the small turbine 1,1 ' it
Between be additionally provided with low pressure main inlet throttle-stop valve 8,8 '.The low pressure main inlet throttle-stop valve 8,8 ' can control steam to enter small turbine 1,1 '.
In the utility model, in order to further control the vapour amount into small turbine 1,1 ', under preferable case, described low
Low pressure pitch 9,9 ' is additionally provided between pressure main inlet throttle-stop valve 8,8 ' and the small turbine 1,1 '.
In the utility model, to the number of the small turbine 1,1 ', there is no particular limitation, for example, the small turbine
Low pressure steam-supplying system includes two small turbines 1,1 '.
In the utility model, it is preferable that the small turbine low pressure steam-supplying system also include boiler 11 and with the small vapour
Turbine 1,1 ' corresponds the feed pump 10,10 ' of connection, and the feed pump 10,10 ' connects with the boiler 11 respectively.It is described
Water is supplied the boiler 11 by feed pump 10,10 ' under the power that corresponding small turbine 1,1 ' provides.
Fig. 1 shows the small turbine low pressure steam-supplying system for including two small turbines, the small turbine low pressure steam supply system
The running of system is：
Before unit starting, the first electric gate valve 1, the first electric gate valve 1 ', the second electric gate valve 6, the second electric gate valve 6 ',
Fast opening butterfly valve 7 and fast opening butterfly valve 7 ' are closed mode.When unit starting, auxiliary steam starts first as vapour source is started
Small turbine 1, fast opening butterfly valve 7 is first opened, then slowly open the second electric gate valve 6 and carry out heating coil, heating coil fully opens low pressure afterwards
Main inlet throttle-stop valve 8 continues heating coil, and heating coil fully opens low pressure pitch 9 afterwards, and auxiliary steam controls small steamer by low pressure pitch 9
The startup of machine 1；During the steam line heating coil of small turbine 1, fast opening butterfly valve 7 ' is opened, slowly opens the second electric gate valve 6 ', it is right
The steam line of small turbine 1 ' carries out heating coil；
When unit load is increased to 50% rated load or so, pressure >=0.55MPa of main steam turbine level Four extraction line
And less than the pressure of auxiliary steam pipeline, when the steam line of small turbine 1 ' progress heating coil is abundant, taken out using main steam turbine level Four
Vapour start small turbine 1 ', close fast opening butterfly valve 7 ', slowly open the first electric gate valve 4 ', be then turned on low pressure main inlet throttle-stop valve 8 ' after
Continuous to carry out heating coil, heating coil fully opens low pressure pitch 9 ' afterwards, and main steam turbine level Four is drawn gas by low pressure pitch 9 ' to control small vapour
The startup of turbine；
After stable operation of unit, switch the vapour source of small turbine 1：The first electric gate valve 1 is slowly opened, it is synchronous slowly to close
The second electric gate valve 6 is closed, and pays close attention to small turbine rotating speed, initial steam pressure, temperature and feedwater flow situation of change, when first
The standard-sized sheet of electric gate valve 1, after the second electric gate valve 6 is fully closed, fast opening butterfly valve 7 is closed, vapour source switching is completed, the vapour source of small turbine 1
Main steam turbine level Four is switched to draw gas steam supply by auxiliary steam steam supply；
During unit normal operation, the vapour source of small turbine 1 and small turbine 1 ' is drawn gas steam supply by main steam turbine level Four.When
Main steam turbine level Four steam bleeding system breaks down suddenly, or main steam turbine level Four draw gas vapour source can not meet small turbine run need
When wanting, corresponding fast opening butterfly valve can be quickly opened, is switched fast as auxiliary steam steam supply, is avoided small turbine from tripping, both ensured
The safe operation of unit, again significantly improve the economy of unit.
Preferred embodiment of the present utility model described in detail above, still, the utility model is not limited to this.At this
In the range of the technology design of utility model, a variety of simple variants can be carried out to the technical solution of the utility model, including it is each
Technical characteristic is combined with any other suitable method, and these simple variants and combination should equally be considered as the utility model
Disclosure of that, belong to the scope of protection of the utility model.
Claims (7)
1. a kind of small turbine low pressure steam-supplying system, it is characterised in that the small turbine low pressure steam-supplying system includes small steamer
Machine (1,1 ') and the main steam turbine level Four extraction line (2,2 ') connected with the small turbine and auxiliary steam pipeline (3,
3 ') the first electric gate valve (4,4 '), the auxiliary steam pipeline, are provided with the main steam turbine level Four extraction line (2,2 ')
On (3,3 ') the second electric gate valve (6,6 ') and fast opening butterfly valve (7,7 ') are disposed with along steam flow direction.
2. small turbine low pressure steam-supplying system according to claim 1, it is characterised in that the fast opening butterfly valve (7,7 ') is
Pneumatic butterfly valve is opened soon.
3. small turbine low pressure steam-supplying system according to claim 1 or 2, it is characterised in that in first electric brake
Between valve (4,4 ') and the small turbine (1,1 ') and in the fast opening butterfly valve (7,7 ') and the small turbine (1,1 ')
Between be provided with check-valves (5,5 ').
4. small turbine low pressure steam-supplying system according to claim 3, it is characterised in that the check-valves (5,5 ') with
Low pressure main inlet throttle-stop valve (8,8 ') is additionally provided between the small turbine (1,1 ').
5. small turbine low pressure steam-supplying system according to claim 4, it is characterised in that the low pressure main inlet throttle-stop valve (8,
8 ') low pressure pitch (9,9 ') is additionally provided between the small turbine (1,1 ').
6. small turbine low pressure steam-supplying system according to claim 1 or 2, it is characterised in that the small turbine low pressure
Steam-supplying system includes two small turbines (1,1 ').
7. small turbine low pressure steam-supplying system according to claim 6, it is characterised in that the small turbine low pressure steam supply
System also includes boiler (11) and the feed pump (10,10 ') of connection, the feedwater is corresponded with the small turbine (1,1 ')
Pump (10,10 ') connects with the boiler (11) respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720629596.0U CN206769966U (en) | 2017-06-01 | 2017-06-01 | Small turbine low pressure steam-supplying system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720629596.0U CN206769966U (en) | 2017-06-01 | 2017-06-01 | Small turbine low pressure steam-supplying system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206769966U true CN206769966U (en) | 2017-12-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720629596.0U Active CN206769966U (en) | 2017-06-01 | 2017-06-01 | Small turbine low pressure steam-supplying system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108868909A (en) * | 2018-06-29 | 2018-11-23 | 东方电气集团东方汽轮机有限公司 | A kind of two-shipper backheat small turbine start-up mode |
| CN109296408A (en) * | 2018-09-18 | 2019-02-01 | 国电南京电力试验研究有限公司 | One kind giving mercury vapour turbine vapour source method for handover control |
-
2017
- 2017-06-01 CN CN201720629596.0U patent/CN206769966U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108868909A (en) * | 2018-06-29 | 2018-11-23 | 东方电气集团东方汽轮机有限公司 | A kind of two-shipper backheat small turbine start-up mode |
| CN109296408A (en) * | 2018-09-18 | 2019-02-01 | 国电南京电力试验研究有限公司 | One kind giving mercury vapour turbine vapour source method for handover control |
| CN109296408B (en) * | 2018-09-18 | 2019-08-06 | 国电南京电力试验研究有限公司 | One kind giving mercury vapour turbine vapour source method for handover control |
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