CN208089356U - A kind of safe operation protection system of zero output low pressure (LP) cylinder - Google Patents
A kind of safe operation protection system of zero output low pressure (LP) cylinder Download PDFInfo
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- CN208089356U CN208089356U CN201820424789.7U CN201820424789U CN208089356U CN 208089356 U CN208089356 U CN 208089356U CN 201820424789 U CN201820424789 U CN 201820424789U CN 208089356 U CN208089356 U CN 208089356U
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Abstract
The utility model discloses the safe operations of zero output low pressure (LP) cylinder to protect system, includes mainly：Injector and low pressure (LP) cylinder intake valve, the low pressure (LP) cylinder intake valve is arranged in fired power generating unit in the blow-off line of intermediate pressure cylinder connection low pressure (LP) cylinder, first admission end of the injector is connected to the blow-off line of intermediate pressure cylinder, and before low pressure (LP) cylinder intake valve, second admission end of the injector is connect with the exhaust line of small machine exhaust line and low pressure (LP) cylinder, the admission end where the rear both stage impellers of the steam output end connection low pressure (LP) cylinder of the injector.This system is simple in structure, easy to spread, can realize the reheating to low pressure (LP) cylinder exhaust stage blade steam by obtaining best filling parameter to the design of jet pump, improve steam quality, protect impeller and blade safety.
Description
Technical field
The utility model is related to fired power generating unit equipment technical field, the safe operation of specifically a kind of zero output low pressure (LP) cylinder is protected
Protecting system.
Background technology
In response to the call of China national energy-saving and emission-reduction policy, fired power generating unit mostly carries out heat supply transformation, and undertakes tune
Peak is run.But when peak load regulation is run, since the reduction of low pressure (LP) cylinder throttle flow makes steam turbine protection when underload lead to the problem of, mesh
Preceding widespread practice is that water curtain is sprayed into turbine to achieve the purpose that protect blade.But root this protection side according to data
Method effect is very limited, the reason is that wet steam forms disengaging cycle in exhaust stage blade root and leaf top, meanwhile, off-design operating mode
Intrinsic wet steam rising when being run under underload in steam has also aggravated exhaust stage blade water erosion.
Furthermore with the development of large-size steam turbine, also quickly, blade constantly increases, this makes its leaf top for exhaust stage blade development
Linear velocity be continuously improved, this so that moist steam is even more serious to the water erosion of exhaust stage blade tip portion.It approaches according to data
Low pressure cylinder, impeller service life under zero load can only have 1-2.
Utility model content
The problems of steam turbine protection aspect is carried out for existing fired power generating unit heat supply transformation process mesolow cylinder, is needed
Want a kind of new low pressure (LP) cylinder steam turbine protection scheme.
For this purpose, problem to be solved in the utility model is to provide a kind of safe operation protection system of zero output low pressure (LP) cylinder
System is protected with being formed to low pressure (LP) cylinder, improves the service life of low pressure cylinder, impeller.
To solve the above-mentioned problems, system is protected in the safe operation of zero output low pressure (LP) cylinder provided by the utility model, mainly
Including：Injector and low pressure (LP) cylinder intake valve, the low pressure (LP) cylinder intake valve are arranged in fired power generating unit intermediate pressure cylinder and connect low pressure (LP) cylinder
Blow-off line in, the first admission end of the injector is connected to the blow-off line of intermediate pressure cylinder, and is located at low pressure (LP) cylinder intake valve
Front, the second admission end of the injector are connect with the exhaust line of small machine exhaust line and low pressure (LP) cylinder, the injector
Steam output end connects the admission end where the rear both stage impellers of low pressure (LP) cylinder.
Further, the steam output end of the injector can also connect the steam inlet pipe road of low pressure (LP) cylinder.
Further, the first admission end of the injector can also connect three pumping pipelines and/or four pumping pipelines.
Further, the second admission end of the injector can also connect other low-temp low-pressure gas source pipes in fired power generating unit
Road.
Further, further include the first blow-off branch in the protection system, first blow-off branch is arranged in low pressure
Cylinder steam output end, and with the piping connection of small machine steam discharge.
Further, further include the second blow-off branch in the protection system, second blow-off branch is arranged in low pressure
Cylinder steam output end, and connect with the air intake of condenser.
Compared with prior art, scheme provided by the utility model has the following advantages that：
1, alternative low pressure (LP) cylinder water curtain technology, it is only necessary to which a small amount of heating steam is equipped with steam exhaust and is passed through low pressure (LP) cylinder, increases stream
Enter the quantity of steam of last two grade blades, and reheating, protection low pressure (LP) cylinder safety are carried out to moist steam.
2 while steam exhaust can be recycled, reduce unit cold source energy, improve unit economy.
3, system structure is simple, easy to spread, can be realized by obtaining best filling parameter to the design of jet pump
To the reheating of the last two grade blade steam of low pressure (LP) cylinder, steam quality, protection impeller safety are improved.
Description of the drawings
The utility model is further illustrated below in conjunction with the drawings and specific embodiments.
Fig. 1 is that system application schematic diagram is protected in the low pressure (LP) cylinder safe operation provided in the example of the utility model.
In figure：Boiler -1, high pressure cylinder -2, intermediate pressure cylinder -3, injector -4, low pressure (LP) cylinder -5, condenser -6, low pressure (LP) cylinder inlet valve
7, jet pump is exported to low pressure (LP) cylinder inlet valve -8, jet pump is exported to low pressure (LP) cylinder seven (eight) extraction opening inlet valve -9, three and is evacuated to spray
It penetrates pump inlet valve -10, four and is evacuated to jet pump inlet valve -11, low pressure (LP) cylinder steam exhaust to jet pump inlet valve -12, intermediate pressure cylinder steam discharge extremely
Jet pump inlet valve -13, small machine steam exhaust to jet pump inlet valve -14, other low-temp low-pressure vapour sources to jet pump inlet valve -15,
Resident's heating system steam pipe road -16.
Specific implementation mode
In order to make the technical means, creative features, achievement of purpose, and effectiveness of the utility model be easy to understand, under
Face combines and is specifically illustrating, and the utility model is expanded on further.
Referring to Fig. 1 which shows using the safe operation of zero output low pressure (LP) cylinder protection system in fired power generating unit in this example
The schematic diagram of system.
For the fired power generating unit arrived involved in this example, it is main include former boiler system 1, high pressure cylinder 2, intermediate pressure cylinder 3 and
Low pressure (LP) cylinder 5, wherein the steam output end of boiler 1 connects high pressure cylinder 2, and the steam output end of high pressure cylinder 2 is connected to the admission end of intermediate pressure cylinder 3,
The blow-off line of intermediate pressure cylinder 3 is connected to low pressure (LP) cylinder 5.
On this basis, this example sets heating and is in charge of 16 on the outside of the blow-off line that intermediate pressure cylinder 3 connects low pressure (LP) cylinder 5, should
Heating is in charge of 16 as resident's heating system steam pipe road connection resident's heating system, realizes that the heat supply to fired power generating unit is transformed,
Improve the utilization ratio of heat.
This example also adds low pressure (LP) cylinder safe operation in the fired power generating unit of heat supply transformation and protects system, to protect low pressure
The safety of cylinder.
Low pressure (LP) cylinder safe operation protection system is mainly constituted with injector 4 and low pressure (LP) cylinder inlet valve 7.Wherein, low
Cylinder pressure inlet valve 7 is arranged in the blow-off line that intermediate pressure cylinder 3 connects low pressure (LP) cylinder 5, and low pressure is controlled by the low pressure (LP) cylinder inlet valve 7
Cylinder throttle flow makes more steam be exported from resident's heating system pipeline, realizes the purpose for expanding area of heat-supply service.Furthermore it is supplying
During heat, which completely closes so that and the cooling steam of low pressure (LP) cylinder enters from valve 8, and between non-heating period, which opens,
Low pressure (LP) cylinder is according to normal regulation active load.
Corresponding, injector 4 is mixed for that will come from other low-pressure steams in intermediate pressure cylinder steam discharge and fired power generating unit system,
A kind of new parameter vapour source is generated, to meet the needs of low pressure (LP) cylinder cooling.
For this purpose, first admission end of this injector 4 is in charge of by one is connected to the gland steam exhauster that intermediate pressure cylinder 3 connects low pressure (LP) cylinder 5
Road, specific link position is between intermediate pressure cylinder 3 and low pressure (LP) cylinder inlet valve 7；Also it is in charge of upper setting intermediate pressure cylinder simultaneously and arranges at this
Vapour is to jet pump inlet valve 13.
As needed, first admission end of this injector 4 is connected to three pumpings (i.e. steam turbine three-level steam extraction) pipeline and four again
(i.e. steam turbine level Four steam extraction) pipeline is taken out, thereon and three is respectively set and is evacuated to jet pump inlet valve 10 and four and be evacuated to injection pump inlet
Valve 11.
Furthermore second admission end of this injector 4 simultaneously with small machine exhaust line, exhaust equipment of LP casing and fired power generating unit
In other low-temp low-pressure vapour source pipelines be connected；And be respectively arranged on corresponding connecting line small machine steam exhaust to jet pump into
Mouth valve 14, low pressure (LP) cylinder steam exhaust to jet pump inlet valve 12 and other low-temp low-pressure vapour sources (low temperature that such as temperature reducing and pressure reducing system comes
Vapour source etc.) to jet pump inlet valve 15.
For the steam output end of this injector 4, it is connected to the admission end where both stage impellers after low pressure (LP) cylinder 5, and in the two
Between setting jet pump be exported to low pressure (LP) cylinder seven (eight) extraction opening inlet valve 9, thus increase low pressure (LP) cylinder end two-stage and cool down steam flow amount,
The enhancing cooling effect cold to low pressure (LP) cylinder end two-stage.The steam that injector 4 is discharged adjusts by inlet valve 9, can adjust entrance
Both stage impellers lower steam amount after low pressure (LP) cylinder 5.
At the same time, the steam output end of injector 4, goes back while connecting the steam inlet pipe road of low pressure (LP) cylinder 5, and is arranged therebetween
Jet pump is exported to low pressure (LP) cylinder inlet valve 8.Injector 4 is connected to the steam inlet pipe road of low pressure (LP) cylinder 5 by the inlet valve 8, will spray
Cooling steam introduce low pressure (LP) cylinder, low pressure (LP) cylinder is cooled down, the intermediate pressure cylinder steam discharge that enters from low pressure (LP) cylinder inlet valve is replaced.
On this basis, this example further in the steam output end of low pressure (LP) cylinder 5 and is set there are two blow-off branch, a steam discharge branch
The piping connection of Guan Yu little machine steam discharges, another blow-off branch are connect with the air intake of condenser 6, so that low pressure (LP) cylinder 5 goes out vapour
End discharge steam exhaust condenses into water, boiler is returned to after can reheating to condenser.
The application constituted accordingly has in the fired power generating unit scheme of zero output low pressure (LP) cylinder safe operation protection system, fired power generating unit
In the steam discharge of intermediate pressure cylinder 3 mainly send to resident's heating system, in order to make low pressure (LP) cylinder 5 maintain system operation, therefrom by injector 4
A small amount of steam is extracted in cylinder pressure gland steam exhauster, formed in pump after nozzle negative-pressure ward low pressure (LP) cylinder 5 and small machine steam discharge and
Other low-temp low-pressure vapour sources, after mixing boosting after feeding low pressure (LP) cylinder 5 in both stage impellers or in the steam inlet pipe road of low pressure (LP) cylinder, supply
To low pressure (LP) cylinder 5, make what rear steam increasing temperature and pressure of low pressure (LP) cylinder, while improving mass dryness fraction, or directly from low pressure (LP) cylinder into vapour
Pipeline enters low pressure (LP) cylinder, and directly cooling low pressure (LP) cylinder maintains steam turbine to achieve the purpose that protect low pressure cylinder, impeller and blade
Normal operation, while having recycled the steam discharge of low pressure (LP) cylinder and small machine.
The scheme that this implementation provides is in application operation, when unit load reduces, first has to ensure resident's heating system
Vapour amount, the steam vapour amount into low pressure (LP) cylinder minimum at this time often because quantity of steam deficiency cause steam before rear both stage impellers
Relative humidity is far longer than the steam under normal duty, to generate cavitation to blade, and will produce action of blast, can energy loss
Bad blade.This example extracts the steam in intermediate pressure cylinder blow-off line on a small quantity, then is formed in jet pump by motive nozzle
Vacuum, low pressure (LP) cylinder steam exhaust, either small machine steam discharge or other low temperature and low pressure steams suck, and mixed steam adds steam extraction from low
Pipeline is flow backwards, into low pressure (LP) cylinder after what, the larger steam of humidity in low pressure (LP) cylinder is realized into reheating, promotes its mass dryness fraction to reach
The purpose for keeping steam in low pressure (LP) cylinder non-condensing or condensing less；It is also possible to directly from low pressure (LP) cylinder air inlet pipe, into low pressure (LP) cylinder
It is interior, original low pressure (LP) cylinder air intake valve is shut, instead of entering the 20-50t/h cooling steams of low pressure (LP) cylinder originally, come several after protecting
The safety of grade blade.Because of the steam of steam jet pump outlet, pressure can be very low, and the degree of superheat is very high, can basis
Different steam, different operating modes, match the steam of different parameters, meet the various requirement of low pressure (LP) cylinder cooling.Meanwhile flow is also
It is adjustable, it can more meet the requirement of low pressure (LP) cylinder cooling.
In addition, can also be distributed between low pressure (LP) cylinder air inlet pipe, seven pumpings or eight pumping pipelines by system call interception as needed
Steam flow, to make low pressure (LP) cylinder zero contribute after cooling reach optimum state.
Basic principles, main features, and advantages of the present invention has been shown and described above.One's own profession
The technical staff of industry is it should be appreciated that the present utility model is not limited to the above embodiments, described in above embodiments and description
Only illustrate the principles of the present invention, on the premise of not departing from the spirit and scope of the utility model, the utility model is also
It will have various changes and improvements, these various changes and improvements fall within the scope of the claimed invention.The utility model
Claimed range is defined by the appending claims and its equivalent thereof.
Claims (6)
1. system is protected in the safe operation of zero output low pressure (LP) cylinder, which is characterized in that the system includes mainly：Injector and low
Cylinder pressure intake valve, the low pressure (LP) cylinder intake valve is arranged in fired power generating unit in the blow-off line of intermediate pressure cylinder connection low pressure (LP) cylinder, described
First admission end of injector is connected to the blow-off line of intermediate pressure cylinder, and before low pressure (LP) cylinder intake valve, the injector
Second admission end is connect with the exhaust line of small machine exhaust line and low pressure (LP) cylinder, the steam output end connection low pressure (LP) cylinder of the injector
Admission end where both stage impellers afterwards.
2. system is protected in safe operation according to claim 1, which is characterized in that the steam output end of the injector can also connect
Connect the steam inlet pipe road of low pressure (LP) cylinder.
3. system is protected in safe operation according to claim 1, which is characterized in that the first admission end of the injector is also
Three pumping pipelines and/or four pumping pipelines can be connected.
4. system is protected in safe operation according to claim 1, which is characterized in that the second admission end of the injector is also
Other low-temp low-pressure gas source pipes in fired power generating unit can be connected.
5. system is protected in safe operation according to claim 1, which is characterized in that further include first in the protection system
Blow-off branch, first blow-off branch are arranged in low pressure (LP) cylinder steam output end, and with the piping connection of small machine steam discharge.
6. system is protected in safe operation according to claim 5, which is characterized in that further include second in the protection system
Blow-off branch, the second blow-off branch setting are connect in low pressure (LP) cylinder steam output end, and with the air intake of condenser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820424789.7U CN208089356U (en) | 2018-03-28 | 2018-03-28 | A kind of safe operation protection system of zero output low pressure (LP) cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820424789.7U CN208089356U (en) | 2018-03-28 | 2018-03-28 | A kind of safe operation protection system of zero output low pressure (LP) cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208089356U true CN208089356U (en) | 2018-11-13 |
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ID=64060775
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820424789.7U Active CN208089356U (en) | 2018-03-28 | 2018-03-28 | A kind of safe operation protection system of zero output low pressure (LP) cylinder |
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| CN (1) | CN208089356U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109736908A (en) * | 2019-01-31 | 2019-05-10 | 西安西热节能技术有限公司 | A kind of internal bypass turbine generator system and method applied to cogeneration units |
| CN110159371A (en) * | 2019-06-05 | 2019-08-23 | 国家电投集团河南电力有限公司开封发电分公司 | Cut the system and method for cylinder operation at part load for more low pressure (LP) cylinder steam turbines |
| CN111852592A (en) * | 2020-06-22 | 2020-10-30 | 西安交通大学 | Steam-free operation system and method based on thermal power intermediate reheating type condenser unit |
| CN114635762A (en) * | 2022-02-23 | 2022-06-17 | 杭州汽轮机股份有限公司 | Emergency shutdown system of negative-pressure steam-admission condensing steam turbine |
-
2018
- 2018-03-28 CN CN201820424789.7U patent/CN208089356U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109736908A (en) * | 2019-01-31 | 2019-05-10 | 西安西热节能技术有限公司 | A kind of internal bypass turbine generator system and method applied to cogeneration units |
| CN110159371A (en) * | 2019-06-05 | 2019-08-23 | 国家电投集团河南电力有限公司开封发电分公司 | Cut the system and method for cylinder operation at part load for more low pressure (LP) cylinder steam turbines |
| CN111852592A (en) * | 2020-06-22 | 2020-10-30 | 西安交通大学 | Steam-free operation system and method based on thermal power intermediate reheating type condenser unit |
| CN111852592B (en) * | 2020-06-22 | 2021-11-19 | 西安交通大学 | Steam-free operation system and method based on thermal power intermediate reheating type condenser unit |
| CN114635762A (en) * | 2022-02-23 | 2022-06-17 | 杭州汽轮机股份有限公司 | Emergency shutdown system of negative-pressure steam-admission condensing steam turbine |
| CN114635762B (en) * | 2022-02-23 | 2024-03-29 | 杭州汽轮动力集团股份有限公司 | Emergency shutdown system of negative pressure steam inlet condensing steam turbine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210930 Address after: 201413 Building 2, 51 Siping Road, Situan Town, Fengxian District, Shanghai Patentee after: Shanghai Zhouhong Electric Power Engineering Technology Center Address before: 232007 22-1-8 room, striker 2 village, National Road, Tian Jia An District, Huainan, Anhui Patentee before: Cheng Chen |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20211231 Address after: 201802 room j12111, building 2, No. 4268, Zhennan Road, Jiading District, Shanghai Patentee after: SHANGHAI SURFER ELECTRIC TECHNOLOGY CO.,LTD. Address before: 201413 Building 2, 51 Siping Road, Situan Town, Fengxian District, Shanghai Patentee before: Shanghai Zhouhong Electric Power Engineering Technology Center |