CN110159360A - A kind of Gas-steam Combined Cycle power plant shaft seal steam supply system and steam supplying method - Google Patents
A kind of Gas-steam Combined Cycle power plant shaft seal steam supply system and steam supplying method Download PDFInfo
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- CN110159360A CN110159360A CN201910502624.6A CN201910502624A CN110159360A CN 110159360 A CN110159360 A CN 110159360A CN 201910502624 A CN201910502624 A CN 201910502624A CN 110159360 A CN110159360 A CN 110159360A
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000000605 extraction Methods 0.000 claims abstract description 52
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 20
- 238000005086 pumping Methods 0.000 claims abstract description 16
- 230000008676 import Effects 0.000 claims abstract description 5
- 230000001105 regulatory effect Effects 0.000 claims description 59
- 238000007789 sealing Methods 0.000 claims description 14
- 238000010025 steaming Methods 0.000 claims description 6
- 238000001704 evaporation Methods 0.000 claims description 5
- 230000008020 evaporation Effects 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 4
- 230000007423 decrease Effects 0.000 claims description 3
- 239000002918 waste heat Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 210000004907 gland Anatomy 0.000 description 7
- 230000033228 biological regulation Effects 0.000 description 5
- 238000010276 construction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
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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
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/02—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type
- F01D11/04—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type using sealing fluid, e.g. steam
- F01D11/06—Control thereof
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
A kind of Gas-steam Combined Cycle power plant shaft seal steam supply system and steam supplying method, system includes the High Pressure Steam Host Piping and low pressure main steam line for being connected to heat boiler outlet main steam, extraction line is drawn on High Pressure Steam Host Piping and low pressure main steam line respectively, high pressure extraction pipeline and low-pressure pumping steam pipeline import auxiliary vapour header jointly；Control valve group is respectively arranged on high pressure extraction pipeline and low-pressure pumping steam pipeline, a lateral is arranged in high pressure extraction pipeline before its control valve group, it is also equipped on the lateral and adjusts valve group and be directly connected to axle envelope steam line, temperature-decreased pressure reducer is set on axle envelope steam line；Auxiliary vapour header draws auxiliary vapour header steam line and connects with axle envelope steam line, and auxiliary vapour header steam line is equipped with control valve.The present invention not only ensure that the rapid starting/stopping of unit to shaft seal steam using high and low pressure main steam, but also realize the cascade utilization of the energy, improve efficiency of energy utilization.
Description
Technical field
The invention belongs to thermal power generation fields, are related to a kind of Gas-steam Combined Cycle power plant shaft seal steam supply system and confession
Vapour method.
Background technique
It by nearly research in 40 years and continuously improves, integrated gas-steam combined cycle power plant is not only more than in efficiency
Steam-electric power, and apparent advantage is embodied at numerous aspects.It has become the generally acknowledged generating efficiency height in the whole world, adjusts
Peak energy power is strong, and unit power small investment, the construction period is short, and occupied area is small, the low generating equipment of new generation of pollution level.
Based on These characteristics, gas-steam combined cycle set has become the primary selection of peak regulation and region energy supply.
Gland seal system carries the important mission of Turbine seal, on the one hand to prevent high-voltage end steam to outward leakage, with
The economy of unit is improved, power house environment quality is improved；On the other hand it prevents low-pressure end air from leaking into unit again, destroys condensing
The vacuum degree of device.External vapour source steam supply axle envelope and self-sealing axle envelope can be divided into according to steam supply source axle envelope.Currently, combined cycle
In the unit of use, two kinds of axle envelope forms are all being used.Even for the axle envelope of self-sealing form, during Unit Commitment
Need to put into shaft seal steam supply system, rather than self-sealing axle envelope then needs to provide shaft seal steam always.
For gas-steam combined cycle set, since its main function is peak regulation and regional function, this just must
Ask unit that there can be quick, frequent start and stop ability.Therefore, for gas-steam combined cycle set, the weight of gland seal system
The property wanted is even more self-evident, and one safe and reliable, economic gland seal system of design is very necessary for combined cycle unit
's.
Summary of the invention
It is an object of the invention to be directed to above-mentioned the problems of the prior art, a kind of Gas-steam Combined Cycle electricity is provided
Factory's shaft seal steam supply system and steam supplying method, not only ensure that the rapid starting/stopping performance of unit, but have very good economy and
Stability.
To achieve the goals above, the technical side that Gas-steam Combined Cycle power plant of the present invention shaft seal steam supply system uses
Case are as follows:
High Pressure Steam Host Piping and low pressure main steam line including being connected to heat boiler outlet main steam, high pressure main steam
High pressure extraction pipeline and low-pressure pumping steam pipeline, high pressure extraction pipeline and low pressure are drawn on pipeline and low pressure main steam line respectively
Extraction line imports auxiliary vapour header jointly；It is respectively arranged with control valve group on high pressure extraction pipeline and low-pressure pumping steam pipeline, it is high
A lateral is arranged in pressure extraction line before its control valve group, which, which is provided with, adjusts valve group and be directly connected to
Axle envelope steam line is provided with the temperature-decreased pressure reducer that can adjust steam supply parameter on axle envelope steam line；Auxiliary vapour header is drawn auxiliary
Vapour header steam line simultaneously connects with axle envelope steam line, and the auxiliary vapour header steam line is equipped with control valve.
The control valve group includes the regulating valve set gradually along steam flow and check-valves；Wherein, the high pressure
The first regulating valve and first check-valve are set on the lateral of extraction line connection steam extraction head, are directly connected to axle envelope air supply pipe
Second regulating valve and second check-valve are set on the lateral in road；Third regulating valve is set on low-pressure pumping steam pipeline and third is stopped
Return valve.
Control valve on the auxiliary vapour header steam line is the 4th regulating valve.
The auxiliary vapour header steam line is connected on the pipeline between temperature-decreased pressure reducer and second check-valve.
Condensed water is passed through in the temperature-decreased pressure reducer.
The axle envelope steam line is divided into the both ends that two branches are connected to Turbo-generator Set.
The Turbo-generator Set uses self-sealing axle envelope or non-self-sealing axle envelope.
The steam supplying method of Gas-steam Combined Cycle power plant of the present invention shaft seal steam supply system, comprising the following steps:
The lateral that high pressure extraction pipeline is directly connected to axle envelope steam line is the first high pressure extraction lateral, connection
The lateral of auxiliary vapour header is the second high pressure extraction lateral；When unit quick start, pass through high pressure extraction pipeline first
And first the direct steam supply of axle envelope from high pressure extraction lateral to Turbo-generator Set, pass through temperature-decreased pressure reducer adjust steam supply ginseng
Number；The first regulating valve and first check-valve are provided on second high pressure extraction lateral, on the first high pressure extraction lateral
It is provided with the second regulating valve and second check-valve, third regulating valve and third check-valves are set on low-pressure pumping steam pipeline；With machine
Group load is gradually increased, and being gradually opened third regulating valve and the first regulating valve makes the main vapour of high pressure and the main vapour of low pressure while importing auxiliary vapour
Header；It imports the temperature of steam in auxiliary vapour header to control by adjusting the aperture of third regulating valve and the first regulating valve, works as temperature
When degree is required lower than shaft seal steam, increase the aperture of the first regulating valve, reduces the aperture of third regulating valve；When temperature is higher than axle envelope
When steam line, increase the aperture of third regulating valve, reduces the aperture of the first regulating valve, open simultaneously auxiliary vapour header steam line
On the 4th regulating valve, and gradually the second regulating valve of close synchronously gradually supplies to axle envelope from the mixed vapour in auxiliary vapour header
Pipeline steam supply.
For non-self-sealing axle envelope, when normal operation, it is divided into two kinds of situations；The first situation: when the main steaming of the low pressure of unit
When vapour parameter meets shaft seal steam parameter request, reduce high pressure main steam amount under start operating performance, until being zero, completely by low pressure
Main steam is adjusted to axle envelope steam line steam supply, steam supply parameter by temperature-decreased pressure reducer；Second situation: when the main steaming of unit low pressure
When vapour parameter cannot be met the requirements, under accidental conditions, using by high pressure extraction pipeline come high pressure main steam and low pressure
The low pressure main steam that main steam extraction line comes by auxiliary vapour header to axle envelope steam line steam supply, close completely by the second regulating valve
It closes, steam supply parameter is adjusted jointly by the mixed proportion and temperature-decreased pressure reducer of high pressure main steam and low pressure main steam.For non-from close
Axle envelope is sealed, in stopping process, as unit load gradually decreases, high pressure main steam and low pressure main steam condition are gradually lowered,
Until low pressure main steam condition is not able to satisfy steam supply parameter, third regulating valve is progressively closed off at this time, reduces the main vapour evaporation capacity for engine of low pressure,
Until high pressure main steam condition is lower than shaft seal steam parameter, steam supply is continued by the steam saved in auxiliary vapour header at this time, until
Dead halt.
Compared with prior art, aperture regulation of the present invention by open and close combination and different valves between valve, energy
It is enough in Turbo-generator Set early period startup stage, when high steam reaches shaft seal steam requirement, only from the main vapour of high pressure to axle envelope
System steam supply is gradually reduced high pressure main steam amount as parameter further increases, and low pressure main steam is gradually put into, until all
By low pressure main steam steam supply, process is opposite when shutdown.By the way that auxiliary vapour header is arranged, it both ensure that high-low pressure steam was sufficiently mixed
It is mixed, and can guarantee after main vapour extraction line valve is all closed, it still is able within the regular hour provide use to axle envelope
Vapour.The present invention not only ensure that the rapid starting/stopping of unit to shaft seal steam using high and low pressure main steam, but also realize the energy
Cascade utilization improves efficiency of energy utilization；The present invention is without starting trouble and from starting trouble to the steam of auxiliary vapour header
Pipe-line construction reduces the initial cost of system, has saved starting trouble O&M cost and fuel cost；Starting is simplified when operation
Step reduces starting difficulty and workload；Shaft seal steam supply system regulation performance is excellent, combined adjustment sensitivity and
Steam supply stability.A lateral, lateral setting is arranged in high pressure extraction pipeline of the present invention before its control valve group
There is regulating valve and be directly connected to axle envelope steam line, which is set, on the one hand when starting unit, can be realized high pressure
Main steam reduces the buffer functions such as auxiliary vapour header to the direct steam supply of axle envelope, effectively shortens and starts the time；On the other hand it is normally transporting
It, can be rapidly by high pressure by adjusting valve group when detecting the steam supply from auxiliary vapour header lower than shaft seal steam requirement when row
The outlet steam supply of main steam and auxiliary vapour header directly mixes, and can improve steam supply parameter rapidly, realizes the real-time dynamic of steam supply parameter
State is adjusted.
Detailed description of the invention
The overall structure diagram of Fig. 1 shaft seal steam supply system of the present invention；
1- waste heat boiler；2- High Pressure Steam Host Piping；3- high pressure extraction pipeline；4- the first high pressure extraction lateral；5-
Second high pressure extraction lateral；The first regulating valve of 6-；7- first check-valve；The second regulating valve of 8-；9- second check-valve；10-
Temperature-decreased pressure reducer；11- axle envelope steam line；12- low pressure main steam line；13- low-pressure pumping steam pipeline；14- third regulating valve；
15- third check-valves；The auxiliary vapour header of 16-；The auxiliary vapour header steam line of 17-；The 4th regulating valve of 18-；19- Turbo-generator Set.
Specific embodiment
Present invention will be described in further detail below with reference to the accompanying drawings.
Referring to Fig. 1, Gas-steam Combined Cycle power plant shaft seal steam supply system of the invention, including connection waste heat boiler 1 go out
The High Pressure Steam Host Piping 2 and low pressure main steam line 12 of mouth main steam, High Pressure Steam Host Piping 2 and low pressure main steam line
High pressure extraction pipeline 3 and low-pressure pumping steam pipeline 13 are drawn on 12 respectively, high pressure extraction pipeline 3 and low-pressure pumping steam pipeline 13 converge jointly
Enter auxiliary vapour header 16；Control valve group, high pressure extraction pipeline are respectively arranged on high pressure extraction pipeline 3 and low-pressure pumping steam pipeline 13
3 are arranged a lateral before its control valve group, are also equipped on the lateral and adjust valve group and be directly connected to axle envelope
Steam line 11, the lateral that high pressure extraction pipeline 3 is directly connected to axle envelope steam line 11 is the first high pressure extraction branched pipe
Road 4, the lateral for connecting auxiliary vapour header 16 is the second high pressure extraction lateral 5.
Control valve group includes the regulating valve set gradually along steam flow and check-valves, the second high pressure extraction lateral
It is provided with the first regulating valve 6 and first check-valve 7 on 5,8 He of the second regulating valve is provided on the first high pressure extraction lateral 4
Third regulating valve 14 and third check-valves 15 are arranged on low-pressure pumping steam pipeline 13 for second check-valve 9.It is set on axle envelope steam line 11
It is equipped with the temperature-decreased pressure reducer 10 that can adjust steam supply parameter, condensed water is passed through in temperature-decreased pressure reducer 10.Auxiliary vapour header 16 is drawn
Auxiliary vapour header steam line 17 simultaneously connects with axle envelope steam line 11, and auxiliary vapour header steam line 17 is equipped with the 4th regulating valve
18.Auxiliary vapour header steam line 17 is connected on the pipeline between temperature-decreased pressure reducer 10 and second check-valve 9.
The steam supplying method of Gas-steam Combined Cycle power plant of the present invention shaft seal steam supply system are as follows: either self-sealing is still
Non- self-sealing axle envelope when unit starting, since low pressure main steam condition is lower, in order to realize unit quick start, passes through first
To the direct steam supply of 19 axle envelope of Turbo-generator Set, steam supply parameter can be with for high pressure extraction pipeline 3, the first high pressure extraction lateral 4
It is adjusted by temperature-decreased pressure reducer 10.As unit load is gradually increased, the parameter of high pressure main steam and low pressure main steam is also gradually
It improves, at this point, being gradually opened third regulating valve 14 and the first regulating valve 6, the main vapour of high pressure and the main vapour of low pressure import auxiliary vapour connection simultaneously
Case 16.The temperature for importing steam in auxiliary vapour header 16 can be come by adjusting the aperture of third regulating valve 14 and the first regulating valve 6
Control increases the aperture of the first regulating valve 6 when temperature is required lower than shaft seal steam, reduces 14 aperture of third regulating valve；Work as temperature
Degree increases by 14 aperture of third regulating valve when being higher than shaft seal steam pipeline, reduces the aperture of the first regulating valve 6.Open simultaneously the 4th tune
Valve 18, and gradually the second regulating valve of close synchronously 8 are saved, from the mixed vapour in auxiliary vapour header gradually to gland seal system steam supply.?
During this, gradually realizes and be directly gradually switched to shaft seal steam by low pressure from the high pressure main steam of starting most initial state
Main steam and high pressure main steam are jointly to gland seal system steam supply, and the evaporation capacity for engine for being gradually reduced high pressure main steam increases the main steaming of low pressure
The evaporation capacity for engine of vapour.
For non-self-sealing axle envelope, when normal operation, it is divided into two kinds of situations.The first situation: when the main steaming of the low pressure of unit
When vapour parameter meets shaft seal steam parameter request, under start operating performance, high pressure main steam amount is further decreased, until being zero.It is complete
Entirely from low pressure main steam to shaft seal steam, steam supply parameter can be adjusted by temperature-decreased pressure reducer 10.Second situation: when unit is low
Pressure main steam condition is when cannot meet the requirements, under accidental conditions, using by high pressure extraction pipeline 3 come high pressure main steam
Pass through auxiliary vapour header 16 to gland seal system steam supply with the low pressure main steam of low-pressure pumping steam pipeline 13, the second regulating valve 8 is closed completely
It closes, steam supply parameter is adjusted jointly by the mixed proportion and temperature-decreased pressure reducer 10 of high pressure main steam and low pressure main steam.
For non-self-sealing axle envelope, in stopping process, as unit load gradually decreases, high pressure main steam and low pressure master
Steam parameter is gradually lowered, until low pressure main steam condition is not able to satisfy steam supply parameter, progressively closes off third regulating valve at this time
14, reduce the main vapour evaporation capacity for engine of low pressure, until high pressure main steam condition is lower than shaft seal steam parameter, at this point, in auxiliary vapour header 16 still
The a certain amount of steam for meeting condition is so preserved, can be continued to gland seal system steam supply, until dead halt.
It should be noted that: the purpose of the first high pressure extraction lateral 4 is arranged in shaft seal steam supply system of the invention
It is:
On the one hand, when starting unit, high pressure main steam may be implemented to the direct steam supply of axle envelope, reduce auxiliary vapour header 16 etc.
Buffer function effectively shortens and starts the time；On the other hand, when operating normally, when detecting the steam supply from auxiliary vapour header 16
It is rapidly that high pressure main steam and auxiliary vapour header 16 outlet steam supply is straight by adjusting the second regulating valve 8 when being required lower than shaft seal steam
Mixing is connect, steam supply parameter can be improved rapidly, realizes the real-time dynamic regulation of steam supply parameter.
The above is only presently preferred embodiments of the present invention, not to carry out any shape to technical solution of the present invention
Restriction in formula, it will be apparent to a skilled person that under the premise of not departing from spirit of that invention and principle, the present invention
Several simple modifications and replacement can also be carried out, these modifications and replacement also can fall into the protection model that claim delimited
Within enclosing.
Claims (10)
1. a kind of Gas-steam Combined Cycle power plant shaft seal steam supply system, it is characterised in that: go out including connection waste heat boiler (1)
The High Pressure Steam Host Piping (2) and low pressure main steam line (12) of mouth main steam, High Pressure Steam Host Piping (2) and the main steaming of low pressure
High pressure extraction pipeline (3) and low-pressure pumping steam pipeline (13) are drawn on steam pipe road (12) respectively, high pressure extraction pipeline (3) and low pressure are taken out
Steam pipe road (13) is respectively connected to auxiliary vapour header (16)；Divide on the high pressure extraction pipeline (3) and low-pressure pumping steam pipeline (13)
It is not provided with control valve group, a lateral, the lateral is arranged in high pressure extraction pipeline (3) before its control valve group
It is provided with and adjusts valve group and be directly connected to axle envelope steam line (11), steam supply can be adjusted by being provided on axle envelope steam line (11)
The temperature-decreased pressure reducer (10) of parameter；The auxiliary vapour header (16) draw auxiliary vapour header steam line (17) and with axle envelope air supply pipe
Road (11) connects, and is provided with control valve on the auxiliary vapour header steam line (17).
2. Gas-steam Combined Cycle power plant according to claim 1 shaft seal steam supply system, it is characterised in that: described
Control valve group includes the motor-driven valve and check-valves set gradually along steam flow；
Wherein, the high pressure extraction pipeline (3), which connects, is arranged the first regulating valve (6) and the on the lateral of auxiliary vapour header (16)
One check-valves (7) is directly connected to that the second regulating valve (8) and second check-valve are arranged on the lateral of axle envelope steam line (11)
(9)；Third regulating valve (14) and third check-valves (15) are set on low-pressure pumping steam pipeline (13).
3. Gas-steam Combined Cycle power plant according to claim 2 shaft seal steam supply system, it is characterised in that: described
Control valve on auxiliary vapour header steam line (17) is the 4th regulating valve (18).
4. Gas-steam Combined Cycle power plant according to claim 3 shaft seal steam supply system, it is characterised in that: described
Auxiliary vapour header steam line (17) is connected on the pipeline between temperature-decreased pressure reducer (10) and second check-valve (9).
5. Gas-steam Combined Cycle power plant according to claim 1 shaft seal steam supply system, it is characterised in that: described
Condensed water is passed through in temperature-decreased pressure reducer (10).
6. Gas-steam Combined Cycle power plant according to claim 1 shaft seal steam supply system, it is characterised in that: described
Axle envelope steam line (11) is divided into the both ends that two branches are connected to Turbo-generator Set (19).
7. Gas-steam Combined Cycle power plant according to claim 6 shaft seal steam supply system, it is characterised in that: described
Turbo-generator Set (19) uses self-sealing axle envelope or non-self-sealing axle envelope.
8. a kind of steam supplying method based on Gas-steam Combined Cycle power plant shaft seal steam supply system described in claim 1, feature
It is, comprising the following steps: the lateral that high pressure extraction pipeline (3) is directly connected to axle envelope steam line (11) is the first high pressure
Steam extraction lateral (4), the lateral for connecting auxiliary vapour header (16) is the second high pressure extraction lateral (5)；
When unit quick start, sent out first by high pressure extraction pipeline (3) and the first high pressure extraction lateral (4) to steamer
The direct steam supply of axle envelope of motor group (19) adjusts steam supply parameter by temperature-decreased pressure reducer (10)；
The first regulating valve (6) and first check-valve (7), the first high pressure extraction are provided on second high pressure extraction lateral (5)
It is provided with the second regulating valve (8) and second check-valve (9) on lateral (4), third tune is set on low-pressure pumping steam pipeline (13)
Save valve (14) and third check-valves (15)；As unit load is gradually increased, it is gradually opened third regulating valve (14) and first and adjusts
Section valve (6) makes the main vapour of high pressure and the main vapour of low pressure while importing in auxiliary vapour header (16)；Import the temperature of steam in auxiliary vapour header (16)
Degree controls by adjusting the aperture of third regulating valve (14) and the first regulating valve (6), when temperature is lower than shaft seal steam requirement,
Increase the aperture of the first regulating valve (6), reduces the aperture of third regulating valve (14)；When temperature is higher than the requirement of axle envelope air supply system
When, increase the aperture of third regulating valve (14), reduces the aperture of the first regulating valve (6), open simultaneously auxiliary vapour header steam line
(17) the 4th regulating valve (18) on, and gradually the second regulating valve of close synchronously (8) are steamed by the mixing in auxiliary vapour header (16)
Vapour is gradually to axle envelope steam line (11) steam supply.
9. steam supplying method according to claim 8, which is characterized in that for non-self-sealing axle envelope, when normal operation, be divided into
Two kinds of situations；The first situation: when the low pressure main steam condition of unit meets shaft seal steam parameter request, under start operating performance
Reduce high pressure main steam amount, until being zero, completely from low pressure main steam to axle envelope steam line (11) steam supply, steam supply parameter passes through
Temperature-decreased pressure reducer (10) is adjusted；Second situation: when unit low pressure main steam condition cannot be met the requirements, work is being operated normally
Under condition, using by high pressure extraction pipeline (3) come high pressure main steam and low pressure main steam extraction line (13) come the main steaming of low pressure
Vapour is by auxiliary vapour header (16) to axle envelope steam line (11) steam supply, and the second regulating valve (8) completely closes, and steam supply parameter is by high pressure
The mixed proportion and temperature-decreased pressure reducer (10) of main steam and low pressure main steam are adjusted jointly.
10. steam supplying method according to claim 8, which is characterized in that for non-self-sealing axle envelope, in stopping process, with
Unit load gradually decrease, high pressure main steam and low pressure main steam condition are gradually lowered, until low pressure main steam condition not
It is able to satisfy steam supply parameter, is progressively closed off at this time third regulating valve (14), the main vapour evaporation capacity for engine of low pressure is reduced, until high pressure main steam is joined
Number is lower than shaft seal steam parameter, continues steam supply by the steam saved in auxiliary vapour header (16) at this time, until dead halt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910502624.6A CN110159360B (en) | 2019-06-11 | 2019-06-11 | Shaft seal steam supply system and method for gas-steam combined cycle power plant |
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|---|---|---|---|
| CN201910502624.6A CN110159360B (en) | 2019-06-11 | 2019-06-11 | Shaft seal steam supply system and method for gas-steam combined cycle power plant |
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| CN110159360B CN110159360B (en) | 2023-12-26 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112431637A (en) * | 2020-11-20 | 2021-03-02 | 沧州华润热电有限公司 | Auxiliary steam header system and power supply system |
| CN113982700A (en) * | 2021-11-04 | 2022-01-28 | 华能山东石岛湾核电有限公司 | High temperature gas cooled reactor shaft seal steam supply system |
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| CN113982700A (en) * | 2021-11-04 | 2022-01-28 | 华能山东石岛湾核电有限公司 | High temperature gas cooled reactor shaft seal steam supply system |
| CN113982700B (en) * | 2021-11-04 | 2023-11-21 | 华能山东石岛湾核电有限公司 | High-temperature gas cooled reactor shaft seal steam supply system |
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