CN109882422A - A kind of double flow moves feed pump turbine recirculation pipe road device and its control method - Google Patents
A kind of double flow moves feed pump turbine recirculation pipe road device and its control method Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 52
- 230000003134 recirculating effect Effects 0.000 claims abstract description 7
- 238000004064 recycling Methods 0.000 claims description 7
- 230000002209 hydrophobic effect Effects 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000003447 ipsilateral effect Effects 0.000 abstract description 3
- 239000003245 coal Substances 0.000 description 6
- 230000005611 electricity Effects 0.000 description 5
- 238000010248 power generation Methods 0.000 description 4
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- 240000002853 Nelumbo nucifera Species 0.000 description 3
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 3
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- 238000013461 design Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
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- 230000009977 dual effect Effects 0.000 description 1
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- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
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- 239000003643 water by type Substances 0.000 description 1
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Abstract
The invention discloses a kind of double flows to move feed pump turbine recirculation pipe road device and its control method, including steam turbine generator, oxygen-eliminating device, recirculation pipe road A, recirculating line B, recirculation pipe road A is equipped with fore pump A and steam feed pump A, recirculation pipe road B is equipped with fore pump B and steam feed pump B, steam feed pump A and steam feed pump B is driven by small turbine respectively, and small turbine cylinder body is coupled by reheater desuperheat water lines；When steam turbine generator rate of load condensate is lower than rated power 50%, stoppage in transit fore pump A or fore pump B, while the revolving speed of the steam feed pump A or steam feed pump B of ipsilateral circulating water pipe road are reduced to 400-900r/min, the outlet electrically operated gate of steam feed pump is closed.The present invention provides a kind of reduction water supply system power consumption, the steam feed pump of stoppage in transit connects the double flow that duration of load application is short, avoids steam feed pump that cavitation occurs and moves feed pump turbine recirculation pipe road device and its control method.
Description
Technical field
The present invention relates to field of generating equipment, in particular to moving the water supply of feed pump turbine list to a kind of double flow
Pump operation control device and control method.
Background technique
In thermal power plant's production run, the generating set of gigawatt is often equipped with two automobile assembly welding Iines, every vapour
Dynamic feed pump group configures a recirculation pipe road, fore pump and steam feed pump, due to the particularity of power grid in actual motion,
Some unit load rates maintain the 50% of rated power hereinafter, in underrun state (steam feed pump original design effect
Rate is 85.18%, and small turbine efficiency is that 82.4%), dual stage steam feed pump operation recirculation door aperture is larger and double flow is dynamic
Feed pump operates under inefficient operating condition, increases the energy consumption of generating set, but simply stops transport a recirculation pipe
Road, when generator needs to increase steam input because of load variation, because steam feed pump and small turbine are in cold state,
2 hours ability installed loads of warming-up are needed, generating set actual motion demand is unable to satisfy, if keeping steam feed pump empty
Turn, and is easy to cause steam feed pump to damage because the pressure difference of steam feed pump intake-outlet generates cavitation, cause bigger
Loss.
Therefore it needs to design set of device, the energy consumption of generating set can be reduced and quickly access load when needed,
Also to avoid steam feed pump that cavitation occurs.
Currently, we retrieve the open source literature on some optimization turbine LP rotors recirculation pipe roads, such as:
1. Chinese Patent Application No. CN201621095878.9, publication date on May 10th, 2017, this application discloses one
Kind power plant cycle water pump optimized operating device, it includes two recirculated waters water inlet main pipes, several branch pipes, valve, contact valves, two
Platform cools down the small-power water circulating pump of unit, four water circulating pumps and parallel connection, by increasing by one between original two water circulating pumps
Two valves and small-power water circulating pump is arranged in the recirculated water water inlet pipe of item parallel connection, and water inlet main pipe increases a contact valve,
In conjunction with actual operating mode, single pump, single pump+small pump, the method for operation of double pump are suitably opened by every unit actual load.It is not
Foot place is that the water circulating pump stopped transport does not maintain to run, and encounters water circulating pump damage in generating set or rate of load condensate rises needs
Stoppage in transit water circulating pump needs to prepare 2 hour reception loads when starting, can not ensure actual motion demand.
Summary of the invention
The present invention provide in view of the above technical problems it is a kind of reduction water supply system power consumption, stoppage in transit steam feed pump connect it is negative
The double flow that the lotus time is short, avoids steam feed pump that cavitation occurs moves feed pump turbine recirculation pipe road device and its controlling party
Method.
To achieve the above object the present invention adopts the following technical scheme:
A kind of dynamic feed pump turbine recirculation pipe road device of double flow, including steam turbine generator, oxygen-eliminating device, recycling water
Pipeline A, recirculating line B, the recirculation pipe road A are equipped with fore pump A and steam feed pump A, the recirculation pipe
Road B is equipped with fore pump B and steam feed pump B, the steam feed pump A and steam feed pump B and is driven respectively by small turbine
Dynamic, the small turbine is coupled by reheater desuperheat water lines, when steam turbine generator rate of load condensate is lower than rated power 50%,
For tape splicing to Water l oad, another steam feed pump tape splicing is all not to give Water l oad to one steam feed pump.
When steam feed pump A not tape splicing load, the recycling pitch of the steam feed pump A is fully opened, before described
It sets pump A to stop transport, the revolving speed of the steam feed pump A maintains 400-900r/min, and the outlet electrically operated gate of the steam feed pump A is closed
It closes；When steam feed pump B not tape splicing load, the recycling pitch of the steam feed pump B is fully opened, the fore pump B
It stops transport, the revolving speed of the steam feed pump B maintains 400-900r/min, and the outlet electrically operated gate of the steam feed pump B is closed.No
The steam feed pump of tape splicing load is in spare warm-up mode, when Turbo-generator Set because running recirculation pipe road occurs
When failure needs the steam feed pump tape splicing load stopped transport or rises steam turbine generator because of network load and need to increase output, it is in
The steam feed pump of spare warm-up mode only need 15 minutes can full power operating, spare steam feed pump is incorporated to quickly be
System, tape splicing is to Water l oad.
When the fore pump A stops transport, when revolving speed >=900r/min of steam feed pump A, steam feed pump A tripping；When
When the fore pump B stops transport, when revolving speed >=900r/min of steam feed pump B, steam feed pump B tripping.
When the fore pump A stops transport, revolving speed >=900r/min of the steam feed pump A, the steam feed pump A enters
Mouth pressure < 0.3MPa tripping；When the fore pump B stops transport, when revolving speed >=900r/min of the steam feed pump B, steam-operating
Feed pump B inlet pressure < 0.3MPa tripping.
The small turbine does not trip.
A kind of double flow moves the control method of feed pump turbine recirculation pipe road device, comprising the following steps:
S1. when generating set rate of load condensate is lower than rated power 50%, following again for steam feed pump to be retired is fully opened
Ring pitch is revised as steam feed pump automatic running to be retired control manually, to gradually reduce turning for steam feed pump to be retired
Speed keeps another all water supply of steam feed pump tape splicing negative until the rotating speed difference of two steam feed pumps is greater than 900r/min
Lotus；When the rotating speed difference of two steam feed pumps is greater than 900r/min, turns the slow steam feed pump of degree without acting on to power, it is fast to turn degree
Steam feed pump can tape splicing it is all give Water l oad.
S2. when steam feed pump outlet pressure to be retired is less than operation steam feed pump 0.5MPa, vapour to be retired is closed
The outlet electrically operated gate of dynamic feed pump；
S3. check whether deaerator feedwater flow matches with generating set load and confirm the steam feed pump of tape splicing load
After normal operation, steam feed pump to be retired of first stopping transport, then the fore pump on same lateral line of stopping transport, finally open driving steam-operating
The small turbine ontology of feed pump is hydrophobic；Generating set load and deaerator feedwater flow matches ratio are that 1MV load needs 26 tons
~30 tons of confluents.
S4. the small turbine that lock is stopped transport is hung, again to 400-900r/min and keeps the revolving speed red switch of steam feed pump
Stablize；
S5. the steam feed pump revolving speed for checking red switch again, as steam feed pump revolving speed >=900r/min, steam-operating water supply
Steam feed pump trips when pump inlet pressure < 0.3Mpa；
S6. normal value > 0.7MPa of steam feed pump outlet pressure and oxygen-eliminating device the pressure difference value a, a exited is checked；
S7. temperature above and below monitoring steam feed pump cylinder, steam-operating water supply is checked when barrel temperature is greater than oxygen-eliminating device temperature
It whether unimpeded pumps recirculating line, checks whether steam feed pump outlet pressure and oxygen-eliminating device pressure difference are normal.
Design principle of the invention:
The heat pump group recirculation pipe road of stoppage in transit is opened, stoppage in transit fore pump A or fore pump B, ipsilateral circulating water pipe road
The revolving speed of steam feed pump A or steam feed pump B maintain 400-900r/min, and the outlet electrically operated gate of steam feed pump is closed, low
The automobile assembly welding Iine and recirculating line of fast spinning reserve make to have in the pump housing to water flowing, and small turbine guarantees into steam on a small quantity
Small turbine group is in warm-up mode, and steam feed pump inlet and outlet pressure difference very little avoids the generation of cavitation, when steamer is sent out
When motor group needs to stop transport because running automobile assembly welding Iine breaks down or because network load rises steam turbine generator needs
Increase output when, the steam feed pump in the spare warm-up mode of low speed rotation only need 15 minutes can full power operating, make standby
System, tape splicing load are quickly incorporated to steam feed pump.
The present invention compared with prior art the utility model has the advantages that
1. water supply system power consumption is effectively reduced, i.e. the consumption of reduction Turbo-generator Set fire coal.The present invention uses 1000MW
Generating set done two groups of tests: calculated unit average load in 430MW or so, single steam feed pump supplies water, water supply
System consumption rate drops to 0.17% by 0.29%, and economize on electricity about 516kWh per hour, and thermal loss of steam turbine is dropped by 8664.26kJ/kWh
To 8533.54kJ/kWh, the influence of the correlative factors such as environmental factor is rejected, equivalent coal consumption for power generation averagely reduces 3g/kWh or so；
Unit average load is calculated in 370MW or so, water supply system consumption rate drops to 0.17% by 0.31%, economizes on electricity per hour
About 518kWh；Thermal loss of steam turbine is down to 8593.95kJ/kWh by 8729.26kJ/kWh, rejects the correlative factors such as environmental factor
It influences, equivalent coal consumption for power generation averagely reduces 3.2g/kWh or so.
2. it is short to access duration of load application, can the increased demand of quick response steam turbine generator load.The present invention is by repeatedly examination
Test, the steam feed pump in low-speed running in 15 minutes can full power operating, especially because power grid needing power plant
When increasing electric power, the spare steam feed pump of warming-up can realize that instantaneous access to Water l oad, reduces cold state in the present invention
Start-up of turbine-driven feed pump after to capacity operation need 2 hours warm-up period.
3. avoiding steam feed pump occurs cavitation.The present invention passes through the preposition pump shutdown ipsilateral recirculation pipe road
Electrically operated gate is exported with steam feed pump is closed, rotating automobile assembly welding Iine at the low rotational speed is greater than inlet and outlet pressure difference
0.6MPa is unsatisfactory for the condition of cavitation generation in steam feed pump, that is, avoids cavitation phenomenons.
Detailed description of the invention
Fig. 1 is schematic diagram of the invention；
Parts title and serial number in figure:
1, recirculation pipe road A, 2, fore pump A, 3, steam feed pump A, 4, reheater desuperheat water lines, 5, steam-operating water supply
Pump B, 6, fore pump B, 7, recirculation pipe road B.
Specific embodiment
Below in conjunction with the drawings and specific embodiments, present invention is further described in detail, but does not limit guarantor of the invention
Protect range and application range:
Embodiment 1:
As shown in Figure 1, the present invention includes steam turbine generator, oxygen-eliminating device, recirculation pipe road A1, recirculating line B7, then
Circulating water line A1 is equipped with fore pump A2 and steam feed pump A3, and recirculation pipe road B7 is equipped with fore pump B6 and steam-operating is given
Water pump B5, steam feed pump A3 and steam feed pump B5 are driven by small turbine respectively, and two small turbines pass through reheater
Desuperheat water lines 4 couple, when steam turbine generator rate of load condensate is lower than rated power 50%, a steam feed pump not tape splicing water supply
Load, another steam feed pump tape splicing is all to give Water l oad.
The present embodiment passes through steam feed pump not tape splicing water supply when steam turbine generator rate of load condensate is lower than rated power 50%
Load makes the steam feed pump of tape splicing load be in efficiency operation state, saves coal consumption to generate electricity.
Embodiment 2:
Difference from example 1 is that: when steam feed pump A3 not tape splicing load, steam feed pump A3's follows again
Ring pitch fully opens, and fore pump A2 stops transport, and the revolving speed of steam feed pump A3 maintains 800r/min, the outlet of steam feed pump A3
Electrically operated gate is closed；When steam feed pump B5 not tape splicing load, the recycling pitch of steam feed pump B5 is fully opened, fore pump
B6 stops transport, and the revolving speed of steam feed pump B5 maintains 800r/min, and the outlet electrically operated gate of steam feed pump B5 is closed.
In the present embodiment, unit average load is calculated in 430MW or so, single steam feed pump supplies water, water supply system
Consumption rate drops to 0.17% by 0.29%, and economize on electricity about 516kWh per hour, and thermal loss of steam turbine is down to by 8664.26kJ/kWh
8533.54kJ/kWh, rejects the influence of the correlative factors such as environmental factor, and equivalent coal consumption for power generation averagely reduces 3g/kWh or so.
A kind of double flow moves the control method of feed pump turbine recirculation pipe road device, comprising the following steps:
S1. when generating set rate of load condensate is lower than rated power 50%, following again for steam feed pump to be retired is fully opened
Ring pitch is revised as steam feed pump automatic running to be retired control manually, to gradually reduce turning for steam feed pump to be retired
Speed keeps another all water supply of steam feed pump tape splicing negative until the rotating speed difference of two steam feed pumps is greater than 900r/min
Lotus；
S2. when steam feed pump outlet pressure to be retired is less than operation steam feed pump 0.5MPa, vapour to be retired is closed
The outlet electrically operated gate of dynamic feed pump；
S3. check whether deaerator feedwater flow matches with generating set load and confirm the steam feed pump of tape splicing load
After normal operation, steam feed pump to be retired of first stopping transport, then the fore pump on same lateral line of stopping transport, finally open driving steam-operating
The small turbine ontology of feed pump is hydrophobic；
S4. the small turbine that lock is stopped transport is hung, again to 400-900r/min and keeps the revolving speed red switch of steam feed pump
Stablize；
S5. the steam feed pump revolving speed for checking red switch again, as steam feed pump revolving speed >=900r/min, steam-operating water supply
Steam feed pump trips when pump inlet pressure < 0.3Mpa；
S6. normal value > 0.7MPa of steam feed pump outlet pressure and oxygen-eliminating device the pressure difference value a, a exited is checked；
S7. temperature above and below monitoring steam feed pump cylinder, steam-operating water supply is checked when barrel temperature is greater than oxygen-eliminating device temperature
It whether unimpeded pumps recirculating line, checks whether steam feed pump outlet pressure and oxygen-eliminating device pressure difference are normal.
Embodiment 3:
With embodiment 2 the difference is that: the revolving speed of steam feed pump A3 or steam feed pump B5 maintain 600r/
min。
In the present embodiment, unit average load is calculated in 370MW or so, and water supply system consumption rate is by 0.31% decline
To 0.17%, economize on electricity about 518kWh per hour；Thermal loss of steam turbine is down to 8593.95kJ/kWh by 8729.26kJ/kWh, rejects ring
The influence of the correlative factors such as border factor, equivalent coal consumption for power generation averagely reduce 3.2g/kWh or so.
Embodiment 4:
Discussed warmly with embodiment 1-3 the difference is that: when fore pump A2 stops transport, the revolving speed of steam feed pump A3 >=
When 900r/min, steam feed pump A (3) tripping；When fore pump B (6) stop transport, revolving speed >=900r/min of steam feed pump B5
When, steam feed pump B5 tripping.
In the present embodiment, it is found through experiment that, as revolving speed >=900r/min of steam feed pump A3 or steam feed pump B5,
Running resistance significantly increases, and so that the ontology of steam feed pump A3 or steam feed pump B5 is warming up to 120 DEG C or more, threatens equipment
It operates normally.
Embodiment 5:
With embodiment 4 the difference is that: when fore pump A2 stop transport when, revolving speed >=900r/ of steam feed pump A3
Min, steam feed pump A3 inlet pressure < 0.3MPa tripping；When fore pump B6 stops transport, the revolving speed of steam feed pump B5 >=
When 900r/min, steam feed pump B5 inlet pressure < 0.3MPa tripping.
In the present embodiment, it is found through experiment that, the revolving speed >=900r/min's or steam feed pump B5 of steam feed pump A3 turns
When speed>=900r/min, cavitation easily occurs for when inlet pressure<0.3MPa, endangers equipment safety, therefore trip protection equipment.
Embodiment 6:
With 1-5 any embodiment the difference is that: small turbine does not trip.
In the present embodiment, small turbine, which does not trip, makes steam feed pump be constantly in operating condition.
Claims (6)
1. a kind of double flow moves feed pump turbine recirculation pipe road device, including steam turbine generator, oxygen-eliminating device, recirculation pipe
Road A (1), recirculating line B (7), the recirculation pipe road A (1) are equipped with fore pump A (2) and steam feed pump A (3), institute
Recirculation pipe road B (7) is stated equipped with fore pump B (6) and steam feed pump B (5), the steam feed pump A (3) and steam-operating are given
Water pump B (5) is driven by small turbine respectively, and the small turbine is coupled by reheater desuperheat water lines (4), and feature exists
In: when steam turbine generator rate of load condensate be lower than rated power 50% when, a steam feed pump not tape splicing to Water l oad, another vapour
Dynamic feed pump tape splicing is all to give Water l oad.
2. double flow according to claim 1 moves feed pump turbine recirculation pipe road device, it is characterised in that: work as steam-operating
Feed pump A (3) not tape splicing load when, the recycling pitch of the steam feed pump A (3) fully opens, the fore pump A (2)
It stops transport, the revolving speed of the steam feed pump A (3) maintains 400-900r/min, the outlet electrically operated gate of the steam feed pump A (3)
It closes；When steam feed pump B (5) not tape splicing load, the recycling pitch of the steam feed pump B (5) is fully opened, described
Fore pump B (6) stops transport, and the revolving speed of the steam feed pump B (5) maintains 400-900r/min, the steam feed pump B (5)
Electrically operated gate is exported to close.
3. double flow according to claim 1 or 2 moves feed pump turbine recirculation pipe road device, it is characterised in that: when
When the fore pump A (2) is stopped transport, when revolving speed >=900r/min of steam feed pump A (3), steam feed pump A (3) tripping；Work as institute
When stating fore pump B (6) and stopping transport, when revolving speed >=900r/min of steam feed pump B (5), steam feed pump B (5) tripping.
4. double flow according to claim 3 moves feed pump turbine recirculation pipe road device, it is characterised in that: when described
When fore pump A (2) stops transport, revolving speed >=900r/min of the steam feed pump A (3), steam feed pump A (3) the entrance pressure
Power < 0.3MPa tripping；When the fore pump B (6) is stopped transport, when revolving speed >=900r/min of the steam feed pump B (5), vapour
Dynamic feed pump B (5) inlet pressure < 0.3MPa tripping.
5. double flow according to claim 1 to 4 moves feed pump turbine recirculation pipe road device, it is characterised in that:
The small turbine does not trip.
6. the control method that a kind of double flow moves feed pump turbine recirculation pipe road device, it is characterised in that: including following step
It is rapid:
S1. when generating set rate of load condensate is lower than rated power 50%, the recycling tune of steam feed pump to be retired is fully opened
Door is revised as steam feed pump automatic running to be retired control manually, to gradually reduce the revolving speed of steam feed pump to be retired, directly
Rotating speed difference to two steam feed pumps is greater than 900r/min, keeps another steam feed pump tape splicing all to Water l oad；
S2. when steam feed pump outlet pressure to be retired be less than operation steam feed pump 0.5MPa when, close steam-operating to be retired to
The outlet electrically operated gate of water pump；
S3. check whether deaerator feedwater flow matches with generating set load and confirm the steam feed pump operation of tape splicing load
After normal, steam feed pump to be retired of first stopping transport, then the fore pump on same lateral line of stopping transport, finally open driving steam-operating water supply
The small turbine ontology of pump is hydrophobic；
S4. the small turbine that lock is stopped transport is hung, by the revolving speed red switch of steam feed pump to 400-900r/min and keeps stable again；
S5. the steam feed pump revolving speed for checking red switch again, as steam feed pump revolving speed >=900r/min, steam feed pump enters
Steam feed pump trips when mouth pressure < 0.3Mpa；
S6. normal value > 0.7MPa of steam feed pump outlet pressure and oxygen-eliminating device the pressure difference value a, a exited is checked；
S7. temperature above and below monitoring steam feed pump cylinder, checks steam feed pump again when barrel temperature is greater than oxygen-eliminating device temperature
Whether circulation line is unimpeded, checks whether steam feed pump outlet pressure and oxygen-eliminating device pressure difference are normal.
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Cited By (3)
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| CN112483425A (en) * | 2020-12-11 | 2021-03-12 | 中国电力工程顾问集团西北电力设计院有限公司 | Constant-speed water supply pump pressure regulating device and operation method |
| CN113482729A (en) * | 2021-07-19 | 2021-10-08 | 内蒙古京泰发电有限责任公司 | Motor intelligent synchronous switching water supply system based on turbo generator set |
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| CN112483425A (en) * | 2020-12-11 | 2021-03-12 | 中国电力工程顾问集团西北电力设计院有限公司 | Constant-speed water supply pump pressure regulating device and operation method |
| CN113482729A (en) * | 2021-07-19 | 2021-10-08 | 内蒙古京泰发电有限责任公司 | Motor intelligent synchronous switching water supply system based on turbo generator set |
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