CN109057897A - Vapour source switching method when for fired power generating unit FCB - Google Patents
Vapour source switching method when for fired power generating unit FCB Download PDFInfo
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- CN109057897A CN109057897A CN201810564020.XA CN201810564020A CN109057897A CN 109057897 A CN109057897 A CN 109057897A CN 201810564020 A CN201810564020 A CN 201810564020A CN 109057897 A CN109057897 A CN 109057897A
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- fcb
- vapour
- small machine
- generating unit
- power generating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Control Of Turbines (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The present invention discloses vapour source switching method when a kind of FCB for fired power generating unit, comprising: when the fired power generating unit single-unit operation, being in severe natural weather or Peak power use, controls auxiliary vapour and opens in advance for small machine electrically operated gate；If the auxiliary vapour is not opened in advance for small machine electrically operated gate, when FCB movement, controls the auxiliary vapour and opened for small machine electrically operated gate；When FCB movement, if the auxiliary vapour is not turned on for small machine electrically operated gate, overshoot controls small machine high-pressure governing valve and opens to access small turbine for vapour source again for cold；When FCB movement, unlatching is cold to maintain auxiliary vapour main-piping pressure to stablize for auxiliary vapour adjustment door to default aperture again；When FCB movement, opens steam feed pump recycling and run with to be switched to single steam feed pump and another steam feed pump is made to maintain to rotate with spare.
Description
Technical field
The present invention relates to vapour source switching methods when field of thermal power more particularly to a kind of FCB for fired power generating unit.
Background technique
With the extension of electrical network capacity, the safety of operation of power networks is increasingly paid attention in countries in the world, wherein requiring power generation
Unit has the function of that FCB is an important measures for ensureing power grid and unit safety stable operation.But China's mainstream unit is being set
At the beginning of meter, there is no considerations to realize FCB function, to realize that FCB function, technical difficulty compare on existing crew base
Greatly, during especially FCB in terms of quick diminishing.The difficulty of quick diminishing control technology mainly has two o'clock in FCB, one of them
It is the vapour source handoff procedure instability problem of small turbine in operation, needs to switch in 1 to 2 seconds from normal four steam extraction source
Cold steam supply again or auxiliary steam steam supply.
In order to solve vapour source switching instability problem, can start before FCB or maintain electrically driven feed pump operation, when FCB pot
Furnace water supply is provided to meet minimum feedwater flow requirement by electrically driven feed pump.But this mode is not to using steam feed pump
It is difficult to meet to the unit of boiler normal water supply, smaller scope of application；And the electric current for starting electrically driven feed pump is excessive, voltage mistake
It is low, it be easy to cause unit FCB to fail；In addition, uneconomical if long-time maintains electrically driven feed pump operation.
Summary of the invention
The object of the present invention is to provide vapour source switching methods when a kind of FCB for fired power generating unit, solve unit FCB
When, the unstable problem of boiler vapour source handoff procedure, while improving the reliability of FCB movement.
To achieve the above object, the vapour source switching method when present invention provides a kind of FCB for fired power generating unit, comprising:
When the fired power generating unit single-unit operation, being in severe natural weather or Peak power use, auxiliary vapour is controlled for small electromechanics
Dynamic door is opened in advance；
If the auxiliary vapour is not opened in advance for small machine electrically operated gate, when FCB movement, controls the auxiliary vapour and supply small electromechanics
Dynamic door is opened；
When FCB movement, if the auxiliary vapour is not turned on for small machine electrically operated gate, overshoot controls small machine high-pressure governing valve and opens
To access small turbine for vapour source again for cold；
When FCB movement, unlatching is cold to maintain auxiliary vapour main-piping pressure to stablize for auxiliary vapour adjustment door to default aperture again；
When FCB movement, opens steam feed pump recycling and run to be switched to single steam feed pump and make another vapour
Dynamic feed pump maintains rotation with spare.
Preferably, controlling the auxiliary vapour when weather forecast meets the Rule of judgment of the preset severe natural weather
It is opened in advance for small machine electrically operated gate.
Preferably, the auxiliary vapour main pipe is equipped with the steam trap connection for making the auxiliary vapour main pipe keep stand-by heat.
Preferably, opening when controlling small machine high-pressure governing valve according to overshoot to access small turbine and FCB for vapour source again for cold
After motion stability, the auxiliary vapour is gradually opened for small machine electrically operated gate.
Preferably, small machine low pressure pitch to be switched to the revolving speed for controlling the steam feed pump, by institute when FCB movement
It states small machine high-pressure governing valve and is switched to the inlet steam pressure for controlling the steam feed pump.
Preferably, when FCB movement and after the auxiliary vapour is opened for small machine electrically operated gate, control the steam-operating that remains operational to
The corresponding small machine low pressure pitch aperture of water pump is stablized with controlling feedwater flow.
Preferably, controlling the steam-operating remained operational when FCB is acted and the auxiliary vapour is not opened for small machine electrically operated gate
The corresponding small machine height of the steam feed pump that the corresponding small machine low pressure pitch of feed pump increases aperture and control remains operational
Pressure pitch is opened into corresponding aperture, is stablized with controlling boiler feedwater flow.
Preferably, controlling auxiliary vapour after FCB movement for axle envelope pitch and being opened into corresponding aperture to maintain axle envelope main-piping pressure
Stablize.
Preferably, control is cold to increase aperture for axle envelope electric switch again and controls auxiliary vapour for the unlatching of axle envelope pitch after FCB movement
To corresponding aperture to maintain axle envelope main-piping pressure to stablize.
Preferably, being controlled cold again to two sections of steam extraction electrically operated gates of No. 2 high-pressure heaters to default aperture when FCB movement
To maintain boiler feed temperature to stablize.
Preferably, when FCB movement when, open auxiliary vapour for oxygen-eliminating device adjustment door to default aperture with maintain oxygen-eliminating device pressure and
Temperature is stablized, and prevents oxygen-eliminating device from boiling.
Compared with prior art, fired power generating unit of the invention single-unit operation, be in severe natural weather or Peak power use
When, it controls auxiliary vapour and is opened in advance for small machine electrically operated gate, and then when FCB movement, auxiliary steam vapour source can quickly access small vapour
Turbine further increases the reliability of FCB movement；When FCB movement, if auxiliary vapour is not turned on for small machine electrically operated gate,
Then overshoot controls small machine high-pressure governing valve and opens to access small turbine for vapour source again for cold, and then keeps the steady of small turbine vapour source
It is qualitative, so that avoiding boiler from cutting off the water supply triggers MFT；When FCB movement, unlatching is cold to adjust door to default aperture to maintain for auxiliary vapour again
Auxiliary vapour main-piping pressure is stablized, while opening steam feed pump recycling to be switched to single steam feed pump operation, to reduce
The disturbance of the steam feed pump of operation.Vapour source switching method when being used for fired power generating unit FCB of the invention is applied widely and passes through
It helps practical.
Detailed description of the invention
Fig. 1 is the schematic diagram of the vapour source system for fired power generating unit of the embodiment of the present invention.
Fig. 2 is the partial structure diagram of the fired power generating unit of the embodiment of the present invention.
Fig. 3 is the structural schematic diagram of the control planning of the control system of the fired power generating unit of the embodiment of the present invention.
The curve graph of the parameter for the experiment one that vapour source switches when the fired power generating unit FCB of Fig. 4 embodiment of the present invention.
The curve graph of the parameter for the experiment two that vapour source switches when Fig. 5 is the fired power generating unit FCB of the embodiment of the present invention.
Specific embodiment
For the technology contents that the present invention will be described in detail, construction feature, below in conjunction with embodiment and cooperate attached drawing make into
One step explanation.
It please refers to Fig.1 to Fig.3, the embodiment of the invention discloses a kind of vapour source system 100 for fired power generating unit, including it is small
Steam turbine 11,12, four sections of steam bleeding systems 13 of steam feed pump, Auxiliary Steam 14, cold section of vapour system 15 of reheating and control
System 16 processed, small turbine 11 are connected to steam feed pump 12, and small turbine 11 is connect with main steam inlet tube road 1, main steam inlet tube road 1
Upper edge is successively arranged main inlet throttle-stop valve 17 and small machine low pressure pitch 18 into vapour path, main steam inlet tube road 1 by auxiliary vapour bypass line 2 with
Auxiliary Steam 14 connects, and main steam inlet tube road 1 is connect by steam extraction bypass line 3 with four sections of steam bleeding systems 13, main steam inlet tube
Road 1 is connect for bypass line 4 with cold section of vapour system 15 of reheating again by cold, and auxiliary vapour bypass line 2 is equipped with auxiliary vapour and supplies small machine
Electrically operated gate 19, steam extraction bypass line 3 are equipped with steam extraction and supply small machine electrically operated gate 21, it is cold be equipped with again for bypass line 4 it is cold again for small
Machine electrically operated gate 22 and small machine high-pressure governing valve 23, control system 16 control main inlet throttle-stop valve 17, small machine high-pressure governing valve 23, small machine low pressure pitch
18, auxiliary vapour for small machine electrically operated gate 19, steam extraction for small machine electrically operated gate 21 and it is cold again supply small machine electrically operated gate 22.
Preferably, the auxiliary vapour main pipe of auxiliary vapour bypass line 2 is equipped with the first steam trap connection 24 to keep auxiliary vapour main pipe hot standby
With；In the present embodiment, the first steam trap connection 24 is located at auxiliary vapour and supplies between small machine electrically operated gate 19 and Auxiliary Steam 14.
Preferably, steam extraction bypass line 3 is equipped with the second steam trap connection 25；It is cold to be dredged again for bypass line 4 equipped with third
Water installations 26.
Specifically, Auxiliary Steam 14 is connected to oxygen-eliminating device 5, and oxygen-eliminating device 5 is connected to steam feed pump 12, auxiliary steam
Pipeline between system 14 and oxygen-eliminating device 5 is equipped with auxiliary vapour and adjusts door 6 for oxygen-eliminating device, and steam feed pump 12 is added by No. 1 high pressure
Hot device 7a, No. 2 high-pressure heater 7b and No. 3 high-pressure heater 7c are connected to boiler 8, cold section of vapour system 15 and No. 1 height of reheating
The pipeline between heater 7a is pressed to be equipped with one section of steam extraction electrically operated gate 9a, cold section of vapour system 15 and No. 2 high-pressure heater of reheating
Pipeline between 7b is equipped with two sections of steam extraction electrically operated gate 9b, between cold section of vapour system 15 and No. 3 high-pressure heater 7c of reheating
Pipeline is equipped with three sections of steam extraction electrically operated gate 9c.
Referring to Fig. 3, preferably, fired power generating unit further includes the sensing device 27 for sensing weather conditions, when sensing fills
When setting the weather conditions that 27 sense and meeting the Rule of judgment of preset severe natural weather, control system 16 controls auxiliary vapour for small
Machine electrically operated gate 19 is opened in advance.
Preferably, small machine low pressure pitch 18 is switched to the revolving speed of control steam feed pump 12 in FCB by control system 16,
Small machine high-pressure governing valve 23 is switched to the inlet steam pressure of control steam feed pump 12；Whereby, small turbine is effectively increased
The stability of 11 revolving speeds control.
The present invention also provides vapour source switching methods when a kind of FCB for fired power generating unit, comprising:
When fired power generating unit single-unit operation, being in severe natural weather or Peak power use, auxiliary vapour is controlled for small machine electrically operated gate
19 open in advance；
If auxiliary vapour is not opened in advance for small machine electrically operated gate 19, when FCB movement, auxiliary vapour is controlled for small machine electrically operated gate 19
It opens；
When FCB movement, if auxiliary vapour is not turned on for small machine electrically operated gate 19, overshoot controls small machine high-pressure governing valve 23 and opens
To access small turbine 11 for vapour source again for cold；
When FCB movement, unlatching is cold to maintain auxiliary vapour main-piping pressure steady for auxiliary vapour pitch (not shown) to default aperture again
It is fixed；
When FCB movement, steam feed pump recycling is opened to be switched to the single operation of steam feed pump 12 and make another
Steam feed pump 12 maintains rotation with spare.
Preferably, controlling auxiliary vapour for small when weather forecast meets the Rule of judgment of the preset severe natural weather
Machine electrically operated gate 19 is opened in advance.
Preferably, when according to overshoot control small machine high-pressure governing valve 23 open with will it is cold again for vapour source access small turbine 11 and
After FCB motion stability, auxiliary vapour is gradually opened for small machine electrically operated gate 19.
Preferably, small machine low pressure pitch 18 is switched to the revolving speed of control steam feed pump 12 when FCB movement, it will be small
Machine high-pressure governing valve 23 is switched to the inlet steam pressure of control steam feed pump 12, to effectively increase 11 revolving speed of small turbine
The stability of control.
Preferably, controlling the steam feed pump 12 remained operational after FCB is acted and auxiliary vapour is opened for small machine electrically operated gate 19
Corresponding small 18 aperture of machine low pressure pitch is stablized with controlling feedwater flow, so that the feedwater flow of boiler 8 is in appropriate range
Fluctuation.
Preferably, controlling the steam feed pump remained operational when FCB is acted and auxiliary vapour is not opened for small machine electrically operated gate 19
The 12 corresponding small machine high pressure tune of steam feed pump 12 that corresponding small machine low pressure pitch 18 increases aperture and control remains operational
Door 23 is opened into corresponding aperture, is stablized with controlling 8 feedwater flow of boiler, so that the feedwater flow of boiler 8 is in model appropriate
Enclose interior fluctuation.
Preferably, controlling auxiliary vapour after FCB movement for axle envelope pitch (not shown) and being opened into corresponding aperture to maintain axle envelope
Main-piping pressure is stablized.
Preferably, control is cold to increase aperture for axle envelope electric switch (not shown) again and controls auxiliary vapour for axle envelope after FCB movement
Pitch is opened into corresponding aperture to maintain axle envelope main-piping pressure to stablize.
Referring to Fig. 2, preferably, being controlled cold electronic to two sections of steam extractions of No. 2 high-pressure heater 7b again when FCB movement
Door 9b maintains 8 feed temperature of boiler to stablize to default aperture.
Preferably, opening auxiliary vapour when FCB movement for oxygen-eliminating device and adjusting door 6 to default aperture to maintain 5 pressure of oxygen-eliminating device
Stablize with temperature, prevents oxygen-eliminating device 5 from boiling.
Specific embodiments of the present invention are illustrated below in conjunction with testing twice:
Test one (please referring to Fig. 4)
Before on June 30th, 2016 18:31:12, FCB triggering, unit load 330MW, main steam pressure 13.3MPa are small
The aperture of machine low pressure pitch 18 is 27.5%, revolving speed 3826r/m, and the aperture of small machine low pressure pitch 18 is 23.3%, and revolving speed is
3819r/m, 8 feedwater flow of boiler is 917t/h at this time.
In the case where auxiliary vapour is for the unlatching in advance of small machine electrically operated gate 19, when unit FCB, the vapour source of small turbine 11 is cut
It is changed to auxiliary steam vapour source；The auxiliary vapour pitch of cold confession again is opened simultaneously to default aperture to maintain auxiliary vapour main-piping pressure to stablize；And it opens
Steam feed pump recycling is opened to be switched to the single operation of steam feed pump 12 and another steam feed pump 12 is made only to maintain to turn
It moves with spare；And small machine low pressure pitch 18 is switched to the revolving speed of control steam feed pump 12, small machine high-pressure governing valve 23 is cut
It is changed to the inlet steam pressure of control steam feed pump 12.
After FCB action triggers, 18:35:26, main steam pressure rises to 15.2MPa, running steam feed pump 12
Small 18 aperture of machine low pressure pitch be 30.75%, the revolving speed of running steam feed pump 12 is 4199r/m, and outlet pressure is
17.94MPa, small 18 aperture of machine low pressure pitch of spare steam feed pump 12 are 23.31%, spare steam feed pump 12
Revolving speed is 3831r/m, and outlet pressure is respectively 17.19MPa.Since individually power output, boiler 8 give water flow to single steam feed pump 12
Amount rapid decrease is 551t/h, and is fluctuated within the scope of 551t/h to 600t/h.
It is cold to be opened again by the 0% of 18:32:00 to 97% for the aperture of auxiliary vapour pitch after FCB action triggers, auxiliary vapour main pipe
Pressure 0.683MPa is risen to by 0.531MPa, and tend towards stability.18:38:00 is cold to be closed extremely for auxiliary vapour pitch by 97% again
85%, the pressure of auxiliary vapour main pipe slowly declines by 0.947MPa, and 18:40:38 minimizes as 0.623MPa.Whole process
Water is steadily controlled in 549t/h between 590t/h.
In this experiment, gland steam is provided by cold section of vapour system 15 of reheating.It is cold again for the aperture of axle envelope electrically operated gate by
Low spot is opened to 45%, and auxiliary vapour is 23% for the aperture of axle envelope pitch, and the pressure of axle envelope main pipe is 30KPa, and relatively stable.
Test two (please referring to Fig. 5)
Before on July 26th, 2016 18:19:36, FCB triggering, unit load 331MW, main steam pressure 13.62MPa are small
The aperture of machine low pressure pitch 18 is 29.82%, revolving speed 3800r/m, and the aperture of small machine low pressure pitch 18 is 30.81%, revolving speed
For 3838r/m, 8 feedwater flow of boiler is 939.5t/h at this time.
In the case where auxiliary vapour is for the unlatching in advance of small machine electrically operated gate 19, when unit FCB, the vapour source of small turbine 11 is cut
It is changed to auxiliary steam vapour source；The auxiliary vapour pitch of cold confession again is opened simultaneously to default aperture to maintain auxiliary vapour main-piping pressure to stablize；And it opens
Steam feed pump recycling is opened to be switched to the single operation of steam feed pump 12 and another steam feed pump 12 is made only to maintain to turn
It moves with spare；And small machine low pressure pitch 18 is switched to the revolving speed of control steam feed pump 12, small machine high-pressure governing valve 23 is cut
It is changed to the inlet steam pressure of control steam feed pump 12.
After FCB action triggers, 18:23:26, main steam pressure rises to 16.87MPa, running steam feed pump
12 small 18 aperture of machine low pressure pitch is 96.21%, and the small machine high-pressure governing valve 23 of running steam feed pump 12 is opened into out
Degree is 16.06%, and the revolving speed of running steam feed pump 12 is 4349r/m, outlet pressure 17.87MPa, spare steam-operating
Small 18 aperture of machine low pressure pitch of feed pump 12 is 32.83%, and the revolving speed of spare steam feed pump 12 is 3847r/m, outlet
Pressure is respectively 17.29MPa.Since individually power output, 8 feedwater flow rapid decrease of boiler are 502t/ to single steam feed pump 12
H, and fluctuated within the scope of 502t/h to 600t/h.
After FCB action triggers, cold to be opened again by the 0% of 18:19:42 to 99.6% for the aperture of auxiliary vapour pitch, auxiliary vapour is female
The pressure of pipe is fallen before to 0.394MPa by 0.541MPa and rises very rapidly up to 0.685MPa again, later slowly decline, in 18:22:
36 moment dropped to minimum 0.488MPa.Operations staff manually by auxiliary vapour for oxygen-eliminating device pitch (not shown) aperture by 16.8%
It closes to aperture 11.6%, auxiliary vapour main-piping pressure tends towards stability.
In this experiment, gland steam is provided by Auxiliary Steam 14/84.Auxiliary vapour is for the aperture of axle envelope pitch
82.2%, the pressure of axle envelope main pipe is 30KPa, and relatively stable.
Compared with prior art, fired power generating unit of the invention single-unit operation, be in severe natural weather or Peak power use
When, it controls auxiliary vapour and is opened in advance for small machine electrically operated gate 19, and then when FCB movement, auxiliary steam vapour source can quickly access small
Steam turbine 11 further increases the reliability of FCB movement；When FCB movement, if auxiliary vapour does not have for small machine electrically operated gate 19
It opens, then overshoot controls small machine high-pressure governing valve 23 and opens to access small turbine 11 for vapour source again for cold, and then keeps small steamer
The stability of 11 vapour source of machine, so that avoiding boiler 8 from cutting off the water supply triggers MFT；When FCB movement, unlatching is cold to adjust door extremely for auxiliary vapour again
Default aperture opens steam feed pump recycling to maintain auxiliary vapour main-piping pressure to stablize to be switched to single steam feed pump
12 operations, to reduce the disturbance of the steam feed pump 12 of operation.Vapour source switching side when being used for fired power generating unit FCB of the invention
Method is applied widely and economical and practical.
The above disclosure is only a preferred example of the present invention, and the scope of the invention cannot be limited thereby,
Therefore equivalent changes made in accordance with the claims of the present invention belong to the range that the present invention is covered.
Claims (11)
1. vapour source switching method when a kind of FCB for fired power generating unit characterized by comprising
When the fired power generating unit single-unit operation, being in severe natural weather or Peak power use, auxiliary vapour is controlled for small machine electrically operated gate
It opens in advance；
If the auxiliary vapour is not opened in advance for small machine electrically operated gate, when FCB movement, controls the auxiliary vapour and supply small machine electrically operated gate
It opens；
When FCB movement, if the auxiliary vapour is not turned on for small machine electrically operated gate, overshoot controls small machine high-pressure governing valve and opens with will
It is cold to access small turbine for vapour source again；
When FCB movement, unlatching is cold to maintain auxiliary vapour main-piping pressure to stablize for auxiliary vapour adjustment door to default aperture again；
When FCB movement when, open steam feed pump recycling be switched to single steam feed pump run and make another steam-operating to
Water pump maintains rotation with spare.
2. being used for vapour source switching method when fired power generating unit FCB as described in claim 1, which is characterized in that work as weather forecast
When meeting the Rule of judgment of the preset severe natural weather, controls the auxiliary vapour and opened in advance for small machine electrically operated gate.
3. being used for vapour source switching method when fired power generating unit FCB as described in claim 1, which is characterized in that the auxiliary vapour is female
Pipe is equipped with the steam trap connection for making the auxiliary vapour main pipe keep stand-by heat.
4. being used for vapour source switching method when fired power generating unit FCB as described in claim 1, which is characterized in that when according to overshoot
Control small machine high-pressure governing valve open with will it is cold again for vapour source access small turbine and FCB motion stability after, gradually open described auxiliary
Vapour supplies small machine electrically operated gate.
5. being used for vapour source switching method when fired power generating unit FCB as described in claim 1, which is characterized in that when FCB is acted
When, small machine low pressure pitch is switched to the revolving speed for controlling the steam feed pump, the small machine high-pressure governing valve is switched to control
The inlet steam pressure of the steam feed pump.
6. as described in claim 1 be used for fired power generating unit FCB when vapour source switching method, which is characterized in that when FCB movement and
After the auxiliary vapour is opened for small machine electrically operated gate, the corresponding small machine low pressure pitch aperture of the steam feed pump remained operational is controlled
Stablized with controlling feedwater flow.
7. as described in claim 1 be used for fired power generating unit FCB when vapour source switching method, which is characterized in that when FCB movement and
When the auxiliary vapour is not opened for small machine electrically operated gate, controls the corresponding small machine low pressure pitch of the steam feed pump remained operational and increase
The corresponding small machine high-pressure governing valve of the steam feed pump that big aperture and control remain operational is opened into corresponding aperture, with control
Boiler feedwater flow is stablized.
8. being used for vapour source switching method when fired power generating unit FCB as described in claim 1, which is characterized in that when FCB is acted
Afterwards, it controls auxiliary vapour and is opened into corresponding aperture for axle envelope pitch to maintain axle envelope main-piping pressure to stablize.
9. being used for vapour source switching method when fired power generating unit FCB as described in claim 1, which is characterized in that when FCB is acted
Afterwards, it controls and cold increase aperture for axle envelope electric switch again and control auxiliary vapour and be opened into corresponding aperture for axle envelope pitch to maintain axle envelope main pipe
Pressure is stablized.
10. being used for vapour source switching method when fired power generating unit FCB as described in claim 1, which is characterized in that when FCB is acted
When, control is cold to maintain boiler feed temperature to stablize to two sections of steam extraction electrically operated gates of No. 2 high-pressure heaters to default aperture again.
11. being used for vapour source switching method when fired power generating unit FCB as described in claim 1, which is characterized in that when FCB is acted
When, auxiliary vapour is opened for oxygen-eliminating device and adjusts door to default aperture to maintain oxygen-eliminating device pressure and temperature to stablize, and prevents oxygen-eliminating device from boiling.
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| CN201810564020.XA CN109057897B (en) | 2018-06-04 | 2018-06-04 | Steam source switching method for thermal power generating unit FCB |
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| CN201810564020.XA CN109057897B (en) | 2018-06-04 | 2018-06-04 | Steam source switching method for thermal power generating unit FCB |
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| CN110219706A (en) * | 2019-06-21 | 2019-09-10 | 华北电力科学研究院有限责任公司 | The feed pump vapour source steam supply control circuit of Steam Turbine, device and method |
| CN110219706B (en) * | 2019-06-21 | 2024-03-08 | 华北电力科学研究院有限责任公司 | Steam supply control circuit, device and method for water supply pump steam source of steam turbine unit |
| CN110986024A (en) * | 2019-11-04 | 2020-04-10 | 中国能源建设集团华东电力试验研究院有限公司 | 660MW supercritical unit water supply system steam source switching control device and control method |
| CN110985139A (en) * | 2019-12-17 | 2020-04-10 | 浙江浙能技术研究院有限公司 | Small machine steam admission control device and method based on application of standby steam source |
| CN111173574A (en) * | 2020-01-16 | 2020-05-19 | 华电电力科学研究院有限公司 | Control method for steam source of water feeding pump steam turbine in deep peak shaving state |
| CN113819400A (en) * | 2021-07-30 | 2021-12-21 | 西安西热节能技术有限公司 | Multi-source integrated automatic switching combined steam supply system and method |
| CN114607480A (en) * | 2022-03-11 | 2022-06-10 | 西安热工研究院有限公司 | Converter-controlled BEST small machine double-machine steam source series complementary structure |
| CN114607480B (en) * | 2022-03-11 | 2024-05-14 | 西安热工研究院有限公司 | BEST (test) small-machine double-machine steam source serial complementary structure |
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