CN106949753A - A kind of control method of the changeable vacuum system of Air-cooled Unit full working scope - Google Patents
A kind of control method of the changeable vacuum system of Air-cooled Unit full working scope Download PDFInfo
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- CN106949753A CN106949753A CN201710213164.6A CN201710213164A CN106949753A CN 106949753 A CN106949753 A CN 106949753A CN 201710213164 A CN201710213164 A CN 201710213164A CN 106949753 A CN106949753 A CN 106949753A
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- condenser
- water ring
- vacuum pump
- air
- preposition
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/10—Auxiliary systems, arrangements, or devices for extracting, cooling, and removing non-condensable gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/02—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids specially adapted for several pumps connected in series or in parallel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B11/00—Controlling arrangements with features specially adapted for condensers
Abstract
The present invention provides a kind of changeable vacuum system of Air-cooled Unit full working scope and control method, the form that the system is combined by using preposition vacuum extractor and small-power water ring vacuum pump, by combining original vacuum system, different operating conditions are adapted to by the combination and switching of system.In the winter time, run by putting into preposition vacuum extractor, greatly improve the vacuum capability in low back pressure area unit, significantly improve the flowing of unit Air-Cooling Island, in the case where ensureing that unit Air-Cooling Island does not freeze, the winter operation back pressure of unit is significantly reduced；Simultaneously in the case where summer temperature is high, water recovery is got off by preposition condensation, air is drained by small-power water ring pump, the cavitation of water ring vacuum pump is on the one hand prevented, unit back pressuce is reduced；The opposing party saves the operation power consumption of vacuum system.This system realizes reduction unit back pressuce, the purpose of reduction operation power consumption under full working scope.
Description
Technical field
The present invention relates to the application field of power plant unit pumped vacuum systems, more particularly, to power plant unit pumped vacuum systems and
Air-Cooling Island winterized equipment, more specifically, being to be related to a kind of changeable vacuum system of Air-cooled Unit full working scope and control method.
Background technology
In the last few years, due to environmental protection and water-saving attention that country builds to power source project, made using air
Quick development has been obtained in power construction for the Air-cooled Unit of cooling medium.And Direct Air-cooled Unit is due to simple in construction,
The features such as required air cooling element is few, is largely used in the place such as China North China, Inner Mongol, Xinjiang, effectively solves rich coal poor
The power generation issues in water area.With the operation and popularization of China's power station direct air-cooling system, its system does not need cooling water, heat transfer
The advantages of temperature difference is big, simple system, air capacity flexible adjustment are reliable, corrosion resistance is strong, floor space is small is gradually reached common understanding,
Compared with wet type cooling unit, air cooling power plant unit unit water consume is only 2kg/kWh, and water-saving result is clearly, it has also become the north
The preferred pattern of water-deficient area new power plant construction.
But the characteristics of Direct Air-cooled Unit is intrinsic, should note frozen problem constantly, in China when determining operation in the winter time
" three Norths " area, the problem of direct air cooled condenser is freezed almost can all occur every year, and the lighter's thermal loss of steam turbine value increases, machine
Group is chronically at uneconomical operating condition, and severe one unit brings significant impact by forced-stopping machine to operation of power networks, while some freeze
Serious power plant, because air cooling tubes condenser restrains bursting by freezing, it has to which air cooling tubes condenser is installed in buying again, because of equipment purchasing and non-
Planned shut-down is to itself bringing huge property loss.Due to the restriction of present vaccum-pumping equipment performance, present Direct Air-Cooled machine
The antifreeze back pressure of unit in winter operation is higher, there is larger energy-saving potential.
Pumped vacuum systems is as one of Important Auxiliary equipment of power plant, and its main function is during unit starting, to coagulate cold end
Vapour device sets up rapidly vacuum, and, is able to maintain that condenser inner vacuum in unit during normal operation.Current power plant is conventional to take out
Vacuum equipment is water-ring vacuum pump, is easily influenceed in the operation of this complete equipment by working solution temperature, not only constrains exhaust capacity,
And easily occur cavitation, cause blade to crack or be broken, influence unit operation safety adds repair and maintenance expense.
The characteristics of additionally, due to vavuum pump itself, its operating efficiency when maintaining unit vacuum is also relatively low.
The Chinese patent of Application No. 201520433961.1 discloses a kind of large-scale thermal power machine group vacuum maintainer
System, its nucleus equipment is the tandem compound of water-ring vacuum pump+lobe pump, and system solves the problem asking for Water-ring vacuum pump cavitation
Topic, also improves the efficiency of pumped vacuum systems to a certain extent, but suction humid air easily cause the emulsifying of lobe pump, it is internal rotten
The failures such as erosion, add slewing, maintenance workload is big in addition.System described in the patent can not be solved this by system configuration
Invent can solve guarantee unit Air-Cooling Island do not freeze in the case of, the problems such as significantly reducing the winter operation back pressure of unit.
For the wide in range economy of Air-cooled Unit and the poor characteristic of vacuum tightness, whether the patent, which is applicable, does not refer to.Application No.
201420174151.4 Chinese patents disclose a kind of double pressure condenser multistage steam injector pumped vacuum systems, the system bag
Include：Steam turbine, the first condenser, the second condenser, low pressure condenser hotwell, muffler, the first steam jet ejector, the second steam
Injector, the 3rd steam jet ejector, the 4th steam jet ejector, the first steam condenser, the second steam condenser and it is arranged at
State the multiple control valves and pipeline between all parts；The system is as a result of a startup steam jet ejector, two steam
Injector is aspirated respectively to high and low pressure side, uses high steam for power, stabilization of exerting oneself, and is able to maintain that the optimal of condenser
Vacuum, its steam jet ejector uses high-temperature steam for power, and whole system is static equipment, without station service, can also reduce dimension
Protect cost.But in view of Direct Air-cooled Unit economy scope is wider, the patent system is to Direct Air-cooled Unit and does not apply to, and
And Direct Air-cooled Unit preventing freeze in winter back pressure is higher, how antifreeze back pressure is reduced by effective means and also do not carried in that patent
And.
Major defect present in prior art is also resided in：
1st, Air-cooled Unit winter higher antifreeze back pressure operation problem, existing pumped vacuum systems equipment can not be solved in itself.
2nd, Air-cooled Unit pumped vacuum systems energy consumption index is higher.
3rd, the existing power-saving technology that vacuumizes can not preferably be applied to Air-cooled Unit.
4th, existing vacuum pumping technology is only in terms of pumped vacuum systems and the energy-conservation under specific operation environment, no respective logic
Control function so that prior art can not meet full working scope drop back pressure and put forward effect.
5th, when summer environment temperature is higher, water ring vacuum pump has cavitation phenomenons.
The content of the invention
In order to overcome above mentioned problem of the prior art, the invention provides a kind of changeable vacuum of Air-cooled Unit full working scope
System and control method, it is combined by system configuration with logic control, under the premise of realizing that pumped vacuum systems is energy-saving, drop
The low antifreeze back pressure of Air-cooled Unit.Combined by system configuration with logic control, realize that pumped vacuum systems is energy-saving.For air cooling
Unit is researched and developed, and adapts to the wide economy situation of Air-cooled Unit.Under the conditions of variable working condition, realized and be self-regulated by control module, made
Vacuum system is under efficient operating mode and run all the time, saves pumped vacuum systems energy consumption.And the invention provides supporting corresponding
Logic control function and related control strategies.When summer temp is high, the cavitation of water ring vacuum pump can be prevented.
To achieve these goals, a kind of changeable vacuum system of Air-cooled Unit full working scope of the invention and control method be such as
Under：The system configuration mainly includes：Steam exhaust device of steam turbine（101）, condensate pump（102）, low pressure heat exchanger（103）, it is empty
Cool island（104）, Air-Cooling Island following current area（105）, Air-Cooling Island countercurrent zone（106）, Air-Cooling Island following current area（107）, raw water ring vacuum pump
One（108）, raw water ring vacuum pump two（109）, preposition vacuum extractor（110）, vacuumize condenser（111）, small-power water ring
Vavuum pump（112）, raw water ring vacuum pump isolating door（201）, the preposition total isolating door of pumped vacuum systems（202）, preposition vacuum means
Put isolating door（203）, preposition vacuum extractor bypass door（204）, small-power water ring vacuum pump isolating door（205）, vacuumize cold
Condenser front open type water segregation door（206）, vacuumize opened water isolating door after condenser（207）, vacuumize condensate before condenser
Isolating door（208）, vacuumize condensate isolating door after condenser（209）, vacuumize condenser condensate bypass door（210）, take out
Vacuum condenser draining valve（211）, opened water（301）, condensate（302）, and connect the valve and pipe fitting of the said equipment.This hair
The schematic diagram of bright patent system is accompanying drawing 1.
In the system, Air-Cooling Island（104）By Air-Cooling Island following current area（105）, Air-Cooling Island countercurrent zone（106）, Air-Cooling Island it is suitable
Flow area（107）Incondensable gas is described to take out true through being discharged to air by pumped vacuum systems at the top of adverse current region in composition, Air-Cooling Island
Empty set system is divided into two parts, and a part is by raw water ring vacuum pump one（108）, raw water ring vacuum pump two（109）And raw water ring is true
Empty pump isolating door（201）And pipeline connection composition, another part is by the total isolating door of preposition pumped vacuum systems（202）, preposition take out
Vacuum plant isolating door（203）, preposition vacuum extractor bypass door（204）, preposition vacuum extractor（110）, vacuumize condensation
Device（111）, small-power water ring vacuum pump（112）And its connecting pipe connection is constituted, and is closed between two parts by the unlatching of valve
Close and switching can be achieved, and small-power is provided between raw water ring vacuum pump one, raw water ring vacuum pump two and small-power water ring vacuum pump
Water ring vacuum pump isolating door（205）, the standby each other of three Water-ring vacuums can be achieved；Vacuumize condenser and be connected with two-way cooling
Water, is all the way opened water（301）, it is connected with open type water lines and vacuumizes condenser front open type water segregation door（206）, vacuumize
Opened water isolating door after condenser（207）, it is condensate all the way in addition（302）, condensate dry point is positioned at condensate pump（102）
Condensate isolating door before outlet, evacuated condenser（208）To vacuumizing after condenser heat exchange again after evacuated condenser
Condensate isolating door（209）Main condensate pipeline is returned to, two-way cooling water can be switched by Valve controlling；It is main in the system
Machine condensate is flowed out by steam exhaust device, goes to vacuumize condenser heat exchange, the condensate after heat exchange all the way after boosting through condensate pump
Condenser condensate bypass door is vacuumized with flowing through all the way in addition（210）Condensate converge after go to low pressure heat exchanger（103）.
The analyzing logic control schematic diagram is that shown in accompanying drawing 2, this technology is furnished with special calculating judge module, the module
Receive detection feedback signal, main parameter signals, correction signal, by calculate judge to send instruction control raw water ring vacuum pump,
Preposition vacuum extractor, also can control preposition vacuum extractor cooling water type.Wherein main parameter signals include：Back pressure, load,
Environment temperature；Correction signal includes：Tightness, heating load, cleanliness factor, humidity.
Technological maheup of the present invention mainly has：Preposition vacuum extractor, small-power water ring vacuum pump, vacuumize condensation
Device, calculating judge module and its logic control method.
Control strategy and typical condition flow have following three kinds：
Operating mode one：Cold season in winter, environment temperature is relatively low, and the general antifreeze operation back pressure of Air-cooled Unit is in 6kPa-12kPa, sheet
Invent after the technology application, using putting into operation for preposition vacuum extractor, and calculate the application of judge module, unit can be prevented
Freeze back pressure and be reduced to 4kPa-10kPa, significantly improve Air-Cooling Island countercurrent zone（106）Top low-temperature space, effectively prevents Air-Cooling Island top
Icing.
Specific workflow：Preposition vacuum extractor bypass door is closed successively（204）, open preposition pumped vacuum systems always every
From door（202）And preposition vacuum extractor isolating door（203）, open and vacuumize condensate isolating door before condenser（208）, open
Vacuumize condensate isolating door after condenser（209）, close and vacuumize condenser condensate bypass door（210）, start preposition take out
Vacuum plant（110）, start small-power water ring vacuum pump（112）, close small-power water ring vacuum pump isolating door（205）, stop transport
Raw water ring vacuum pump one（108）And raw water ring vacuum pump two（109）, close raw water ring vacuum pump isolating door（201）.Whole original is taken out
Vacuum system is by preposition vacuum extractor（110）Plus small-power water ring vacuum pump（112）Substitute.Incondensable gas in Air-Cooling Island
Pass through preposition vacuum extractor with a small amount of steam（110）It is drawn into and vacuumizes condenser（111）, steam formed after supercooling
It is hydrophobic via vacuumizing condenser draining valve（211）Drain into steam exhaust device of steam turbine（101）In.Incondensable gas is by small-power water
Ring vacuum pump（112）Heel row is taken away to air.Raw water ring vacuum pump does not put into operation after being isolated.Now
Vacuumize condenser（111）Cooling water is steam turbine condensate（302）.
Operating mode two：Season in spring and autumn, environment temperature is suitable, and unit back pressuce control is not present anti-in 10kPa-18kPa, Air-Cooling Island
Raw water ring vacuum pump operational efficiency is higher under the problem of jelly, and this environmental condition.Judge module is calculated according to each signal to be judged
Pumped vacuum systems is put into the former method of operation by control.
Specific workflow：Open raw water ring vacuum pump isolating door（201）, start raw water ring vacuum pump one（108）Or it is former
Water ring vacuum pump two（109）Any one, stoppage in transit small-power water ring vacuum pump（112）, preposition vacuum extractor of stopping transport（110）,
Close the total isolating door of preposition pumped vacuum systems（202）, close and vacuumize condensate isolating door before condenser（208）, closing is taken out true
Condensate isolating door after air-cooled condenser（209）, open and vacuumize condenser condensate bypass door（210）, whole pumped vacuum systems
It is switched to former pumped vacuum systems.
Operating mode three：Summer high temperature season, unit back pressuce causes water ring vacuum pump to cool down in more than 18KPa, environment temperature height
Coolant-temperature gage temperature is more than 30 DEG C, and now the Water-ring vacuum efficiency of pump is decreased obviously, in order to avoid water ring vacuum pump is in poorly efficient area,
And whole pumped vacuum systems energy consumption is reduced, pumped vacuum systems, which is switched to, vacuumizes condenser（111）Series connection raw water ring vacuum pump
One（108）Or raw water ring vacuum pump two（109）.
Specific workflow：Open preposition vacuum extractor bypass door（204）, the preposition total isolating door of pumped vacuum systems
（202）, close preposition vacuum extractor isolating door（203）, open and vacuumize condenser front open type water segregation door（206）, take out true
Opened water isolating door after air-cooled condenser（207）, close preposition vacuum extractor（110）, small-power water ring vacuum pump（112）, open
Open small-power water ring vacuum pump isolating door（205）, start raw water ring vacuum pump one（108）Or raw water ring vacuum pump two（109）, close
Close raw water ring vacuum pump isolating door（201）；Incondensable gas and a small amount of steam in Air-Cooling Island is by vacuumizing condenser
（111）, steam forms hydrophobic via vacuumizing condenser draining valve after supercooling（211）Drain into steam exhaust device of steam turbine
（101）In；Incondensable gas is by raw water ring vacuum pump one or raw water ring vacuum pump two（Heel row is taken away to air；Small Water-ring vacuum
Pump does not put into operation after being isolated；Now vacuumize condenser（111）Cooling water is opened water（301）.
Relative to prior art, the advantage of the invention is that：
1st, combined by system configuration with logic control, under the premise of realizing that pumped vacuum systems is energy-saving, reduce Air-cooled Unit
Antifreeze back pressure.
2nd, combined by system configuration with logic control, realize that pumped vacuum systems is energy-saving.
3rd, researched and developed for Air-cooled Unit, adapt to the wide economy situation of Air-cooled Unit.
4th, under the conditions of variable working condition, realized and be self-regulated by control module, vacuum system is in all the time under efficient operating mode and transport
OK, pumped vacuum systems energy consumption is saved.
5th, the supporting corresponding logic control function of this technology and related control strategies.
6th, when summer temp is high, the cavitation of water ring pump can be prevented.
Brief description of the drawings
Next with reference to accompanying drawing, the invention will be further described, wherein：
Fig. 1：The changeable vacuum system schematic diagram of Air-cooled Unit full working scope
Fig. 2：The changeable vacuum system control logic schematic diagram of Air-cooled Unit full working scope
In figure：Steam exhaust device of steam turbine（101）, condensate pump（102）, low pressure heat exchanger（103）, Air-Cooling Island（104）, Air-Cooling Island
Following current area（105）, Air-Cooling Island countercurrent zone（106）, Air-Cooling Island following current area（107）, raw water ring vacuum pump one（108）, raw water ring is true
Empty pump two（109）, preposition vacuum extractor（110）, vacuumize condenser（111）, small-power water ring vacuum pump（112）, raw water
Ring vacuum pump isolating door（201）, the preposition total isolating door of pumped vacuum systems（202）, preposition vacuum extractor isolating door（203）, it is preceding
Put vacuum extractor bypass door（204）, small-power water ring vacuum pump isolating door（205）, vacuumize condenser front open type water segregation
Door（206）, vacuumize opened water isolating door after condenser（207）, vacuumize condensate isolating door before condenser（208）, take out true
Condensate isolating door after air-cooled condenser（209）, vacuumize condenser condensate bypass door（210）, vacuumize condenser draining valve
（211）, opened water（301）, condensate（302）.
Embodiment
Refer to the attached drawing 1, the invention provides a kind of changeable vacuum system of Air-cooled Unit full working scope and control method, it leads to
Cross system configuration to be combined with logic control, under the premise of realizing that pumped vacuum systems is energy-saving, reduce the antifreeze back pressure of Air-cooled Unit.
Combined by system configuration with logic control, realize that pumped vacuum systems is energy-saving.For Air-cooled Unit research and development, air cooler is adapted to
The wide economy situation of group.Under the conditions of variable working condition, realized and be self-regulated by control module, make vacuum system all the time in efficient
Run under operating mode, save pumped vacuum systems energy consumption.And the invention provides supporting corresponding logic control function and related control
System strategy.When summer temp is high, the cavitation of water ring vacuum pump can be prevented.
To achieve these goals, a kind of changeable vacuum system of Air-cooled Unit full working scope of the invention and control method be such as
Under：The system mainly includes：Steam exhaust device of steam turbine（101）, condensate pump（102）, low pressure heat exchanger（103）, Air-Cooling Island
（104）, Air-Cooling Island following current area（105）, Air-Cooling Island countercurrent zone（106）, Air-Cooling Island following current area（107）, raw water ring vacuum pump one
（108）, raw water ring vacuum pump two（109）, preposition vacuum extractor（110）, vacuumize condenser（111）, small-power water ring is true
Empty pump（112）, raw water ring vacuum pump isolating door（201）, the preposition total isolating door of pumped vacuum systems（202）, preposition vacuum extractor
Isolating door（203）, preposition vacuum extractor bypass door（204）, small-power water ring vacuum pump isolating door（205）, vacuumize condensation
Device front open type water segregation door（206）, vacuumize opened water isolating door after condenser（207）, vacuumize before condenser condensate every
From door（208）, vacuumize condensate isolating door after condenser（209）, vacuumize condenser condensate bypass door（210）, take out true
Air-cooled condenser draining valve（211）, opened water（301）, condensate（302）, and connect the valve and pipe fitting of the said equipment.
In the system, Air-Cooling Island（104）By Air-Cooling Island following current area（105）, Air-Cooling Island countercurrent zone（106）, Air-Cooling Island it is suitable
Flow area（107）Incondensable gas is described to take out true through being discharged to air by pumped vacuum systems at the top of adverse current region in composition, Air-Cooling Island
Empty set system is divided into two parts, and a part is by raw water ring vacuum pump one（108）, raw water ring vacuum pump two（109）And raw water ring is true
Empty pump isolating door（201）And pipeline connection composition, another part is by the total isolating door of preposition pumped vacuum systems（202）, preposition take out
Vacuum plant isolating door（203）, preposition vacuum extractor bypass door（204）, preposition vacuum extractor（110）, vacuumize condensation
Device（111）, small-power water ring vacuum pump（112）And its connecting pipe connection is constituted, and is closed between two parts by the unlatching of valve
Close and switching can be achieved, and small-power is provided between raw water ring vacuum pump one, raw water ring vacuum pump two and small-power water ring vacuum pump
Water ring vacuum pump isolating door（205）, the standby each other of three Water-ring vacuums can be achieved；Vacuumize condenser and be connected with two-way cooling
Water, is all the way opened water（301）, it is connected with open type water lines and vacuumizes condenser front open type water segregation door（206）, vacuumize
Opened water isolating door after condenser（207）, it is condensate all the way in addition（302）, condensate dry point is positioned at condensate pump（102）
Condensate isolating door before outlet, evacuated condenser（208）To vacuumizing after condenser heat exchange again after evacuated condenser
Condensate isolating door（209）Main condensate pipeline is returned to, two-way cooling water can be switched by Valve controlling；It is main in the system
Machine condensate is flowed out by steam exhaust device, goes to vacuumize condenser heat exchange, the condensate after heat exchange all the way after boosting through condensate pump
Condenser condensate bypass door is vacuumized with flowing through all the way in addition（210）Condensate converge after go to low pressure heat exchanger（103）.
The analyzing logic control schematic diagram is that shown in accompanying drawing 2, this technology is furnished with special calculating judge module, the module
Receive detection feedback signal, main parameter signals, correction signal, by calculate judge to send instruction control raw water ring vacuum pump,
Preposition vacuum extractor, also can control preposition vacuum extractor cooling water type.Wherein main parameter signals include：Back pressure, load,
Environment temperature；Correction signal includes：Tightness, heating load, cleanliness factor, humidity.
Technological maheup of the present invention mainly has：Preposition vacuum extractor, small-power water ring vacuum pump, vacuumize condensation
Device, calculating judge module and its logic control method.
Control strategy and typical condition flow have following three kinds：
Operating mode one：Cold season in winter, environment temperature is relatively low, and the general antifreeze operation back pressure of Air-cooled Unit is in 6kPa-12kPa, sheet
Invent after the technology application, using putting into operation for preposition vacuum extractor, and calculate the application of judge module, unit can be prevented
Freeze back pressure and be reduced to 4kPa-10kPa, significantly improve Air-Cooling Island countercurrent zone（106）Top low-temperature space, effectively prevents Air-Cooling Island top
Icing.
Specific workflow：Preposition vacuum extractor bypass door is closed successively（204）, open preposition pumped vacuum systems always every
From door（202）And preposition vacuum extractor isolating door（203）, open and vacuumize condensate isolating door before condenser（208）, open
Vacuumize condensate isolating door after condenser（209）, close and vacuumize condenser condensate bypass door（210）, start preposition take out
Vacuum plant（110）, start small-power water ring vacuum pump（112）, close small-power water ring vacuum pump isolating door（205）, stop transport
Raw water ring vacuum pump one（108）And raw water ring vacuum pump two（109）, close raw water ring vacuum pump isolating door（201）.Whole original is taken out
Vacuum system is by preposition vacuum extractor（110）Plus small-power water ring vacuum pump（112）Substitute.Incondensable gas in Air-Cooling Island
Pass through preposition vacuum extractor with a small amount of steam（110）It is drawn into and vacuumizes condenser（111）, steam formed after supercooling
It is hydrophobic via vacuumizing condenser draining valve（211）Drain into steam exhaust device of steam turbine（101）In.Incondensable gas is by small-power water
Ring vacuum pump（112）Heel row is taken away to air.Raw water ring vacuum pump does not put into operation after being isolated.Now
Vacuumize condenser（111）Cooling water is steam turbine condensate（302）.
Operating mode two：Season in spring and autumn, environment temperature is suitable, and unit back pressuce control is not present anti-in 10kPa-18kPa, Air-Cooling Island
Raw water ring vacuum pump operational efficiency is higher under the problem of jelly, and this environmental condition.Judge module is calculated according to each signal to be judged
Pumped vacuum systems is put into the former method of operation by control.
Specific workflow：Open raw water ring vacuum pump isolating door（201）, start raw water ring vacuum pump one（108）Or it is former
Water ring vacuum pump two（109）Any one, stoppage in transit small-power water ring vacuum pump（112）, preposition vacuum extractor of stopping transport（110）,
Close the total isolating door of preposition pumped vacuum systems（202）, close and vacuumize condensate isolating door before condenser（208）, closing is taken out true
Condensate isolating door after air-cooled condenser（209）, open and vacuumize condenser condensate bypass door（210）, whole pumped vacuum systems
It is switched to former pumped vacuum systems.
Operating mode three：Summer high temperature season, unit back pressuce causes water ring vacuum pump to cool down in more than 18KPa, environment temperature height
Coolant-temperature gage temperature is more than 30 DEG C, and now the Water-ring vacuum efficiency of pump is decreased obviously, in order to avoid water ring vacuum pump is in poorly efficient area,
And whole pumped vacuum systems energy consumption is reduced, pumped vacuum systems, which is switched to, vacuumizes condenser（111）Series connection raw water ring vacuum pump
One（108）Or raw water ring vacuum pump two（109）.
Specific workflow：Open preposition vacuum extractor bypass door（204）, the preposition total isolating door of pumped vacuum systems
（202）, close preposition vacuum extractor isolating door（203）, open and vacuumize condenser front open type water segregation door（206）, take out true
Opened water isolating door after air-cooled condenser（207）, close preposition vacuum extractor（110）, small-power water ring vacuum pump（112）, open
Open small-power water ring vacuum pump isolating door（205）, start raw water ring vacuum pump one（108）Or raw water ring vacuum pump two（109）, close
Close raw water ring vacuum pump isolating door（201）；Incondensable gas and a small amount of steam in Air-Cooling Island is by vacuumizing condenser
（111）, steam forms hydrophobic via vacuumizing condenser draining valve after supercooling（211）Drain into steam exhaust device of steam turbine
（101）In；Incondensable gas is by raw water ring vacuum pump one or raw water ring vacuum pump two（Heel row is taken away to air；Small Water-ring vacuum
Pump does not put into operation after being isolated；Now vacuumize condenser（111）Cooling water is opened water（301）.
Example explanation：
The subcritical Direct Air-Cooled condensing turbine groups of certain 600MW, pumped vacuum systems is with 3 170kW water ring vacuum pumps, operation side
Formula is dual-purpose one standby.Preventing freeze in winter runs the minimum 8kPa of back pressure, and two water ring vacuum pumps usually run power 120kW, vacuumized
System always runs power 240kW.Former pumped vacuum systems power consumption is considered higher, if not considering Air-Cooling Island at a temperature of winter environment
Antifreeze, operation back pressure can be reduced further.
After technology of the present invention, the preventing freeze in winter operation near 6kPa of back pressure declines 2kPa, winter pumped vacuum systems
Overall power is 80kW；Summer unit back pressuce declines 0.2kPa, and summer pumped vacuum systems overall power is 80kW；Then reduce back pressure
Folding is economized on coal about 3060 tons in year, vacuumizes the kWh of power drop folding year amount of electricity saving about 640,000, and mark coal unit price presses 500 yuan/ton, online electricity
Valency considers by 0.35 yuan/kWh, then about 175.4 ten thousand yuan of year energy saving profit.Energy-saving benefit is notable.
It is of the present invention system logic control schematic diagram in monitoring feedback can be single temperature point, or temperature field monitor,
Or pressure-measuring-point, or flow measuring point.
The method of operation of the present invention is not limited to above-mentioned three kinds typical operating conditions, preposition vacuum extractor, small-power
Water ring vacuum pump operation different with raw water ring vacuum pump is combined also in protection scope of the present invention.
Judge module is calculated in analyzing logic control schematic diagram described in accompanying drawing 2 of the present invention, can be DCS logic functions, or
Person's PLC control modules, or software program in server.
Preposition vacuum extractor in system described in the technology of the present invention（110）, preferentially from steam jet ejector, sieve also may be selected
Thatch formula vavuum pump, high speed centrifugation vavuum pump.
Relative to prior art, the advantage of the invention is that：
1st, combined by system configuration with logic control, under the premise of realizing that pumped vacuum systems is energy-saving, reduce Air-cooled Unit
Antifreeze back pressure.
2nd, combined by system configuration with logic control, realize that pumped vacuum systems is energy-saving.
3rd, researched and developed for Air-cooled Unit, adapt to the wide economy situation of Air-cooled Unit.
4th, under the conditions of variable working condition, realized and be self-regulated by control module, vacuum system is in all the time under efficient operating mode and transport
OK, pumped vacuum systems energy consumption is saved.
5th, the supporting corresponding logic control function of this technology and related control strategies.
6th, when summer temp is high, the cavitation of water ring pump can be prevented.
Although embodiments of the invention have been shown and described above, it is to be understood that above-mentioned case study on implementation is to show
Example property, it is impossible to be interpreted as limitation of the present invention, one of ordinary skill in the art within the scope of the invention can be to upper
State embodiment be changed, change, replacing and modification, these change, modification, replacement and modification are also considered as the protection model of the present invention
Enclose.
Claims (4)
1. a kind of control method of the changeable vacuum system of Air-cooled Unit full working scope：
The system mainly includes：Steam exhaust device of steam turbine（101）, condensate pump（102）, low pressure heat exchanger（103）, Air-Cooling Island
（104）, Air-Cooling Island following current area（105）, Air-Cooling Island countercurrent zone（106）, Air-Cooling Island following current area（107）, raw water ring vacuum pump one
（108）, raw water ring vacuum pump two（109）, preposition vacuum extractor（110）, vacuumize condenser（111）, small-power water ring is true
Empty pump（112）, raw water ring vacuum pump isolating door（201）, the preposition total isolating door of pumped vacuum systems（202）, preposition vacuum extractor
Isolating door（203）, preposition vacuum extractor bypass door（204）, small-power water ring vacuum pump isolating door（205）, vacuumize condensation
Device front open type water segregation door（206）, vacuumize opened water isolating door after condenser（207）, vacuumize before condenser condensate every
From door（208）, vacuumize condensate isolating door after condenser（209）, vacuumize condenser condensate bypass door（210）, take out true
Air-cooled condenser draining valve（211）, opened water（301）, condensate（302）, and connect the valve and pipe fitting of the said equipment；
In the system, Air-Cooling Island（104）By Air-Cooling Island following current area（105）, Air-Cooling Island countercurrent zone（106）, Air-Cooling Island following current area
（107）Incondensable gas by pumped vacuum systems at the top of adverse current region through being discharged to air in composition, Air-Cooling Island, and described vacuumize is
System is divided into two parts, and a part is by raw water ring vacuum pump one（108）, raw water ring vacuum pump two（109）And raw water ring vacuum pump
Isolating door（201）And pipeline connection composition, another part is by the total isolating door of preposition pumped vacuum systems（202）, preposition vacuumize
Device isolating door（203）, preposition vacuum extractor bypass door（204）, preposition vacuum extractor（110）, vacuumize condenser
（111）, small-power water ring vacuum pump（112）And its connecting pipe connection is constituted, closed between two parts by the unlatching of valve
Switching can be achieved, and small-power water is provided between raw water ring vacuum pump one, raw water ring vacuum pump two and small-power water ring vacuum pump
Ring vacuum pump isolating door（205）, the standby each other of three Water-ring vacuums can be achieved；Vacuumize condenser and be connected with two-way cooling
Water, is all the way opened water（301）, it is connected with open type water lines and vacuumizes condenser front open type water segregation door（206）, vacuumize
Opened water isolating door after condenser（207）, it is condensate all the way in addition（302）, condensate dry point is positioned at condensate pump（102）
Condensate isolating door before outlet, evacuated condenser（208）To vacuumizing after condenser heat exchange again after evacuated condenser
Condensate isolating door（209）Main condensate pipeline is returned to, two-way cooling water can be switched by Valve controlling；It is main in the system
Machine condensate is flowed out by steam exhaust device, goes to vacuumize condenser heat exchange, the condensate after heat exchange all the way after boosting through condensate pump
Condenser condensate bypass door is vacuumized with flowing through all the way in addition（210）Condensate converge after go to low pressure heat exchanger（103）；
Characterized in that, the system also includes calculating judge module, the module receives detection feedback signal, main parameter signals, repaiied
Positive quantity signal, judges to send instruction control raw water ring vacuum pump, preposition vacuum extractor, also controls preposition vacuumize by calculating
Device cooling water type；Wherein main parameter signals include：Back pressure, load, environment temperature；Correction signal includes：Tightness, confession
Heat, cleanliness factor, humidity；
The control strategy and typical condition flow that the control method includes mainly have following three kinds：
Operating mode one：Improve Air-Cooling Island countercurrent zone（106）Top low-temperature space, effectively prevents the icing on Air-Cooling Island top；
Specific workflow：Preposition vacuum extractor bypass door is closed successively（204）, open the preposition total isolating door of pumped vacuum systems
（202）And preposition vacuum extractor isolating door（203）, open and vacuumize condensate isolating door before condenser（208）, unlatching is taken out true
Condensate isolating door after air-cooled condenser（209）, close and vacuumize condenser condensate bypass door（210）, start preposition vacuumize
Device（110）, start small-power water ring vacuum pump（112）, close small-power water ring vacuum pump isolating door（205）, stoppage in transit raw water
Ring vacuum pump one（108）And raw water ring vacuum pump two（109）, close raw water ring vacuum pump isolating door（201）；Whole original is vacuumized
System is by preposition vacuum extractor（110）Plus small-power water ring vacuum pump（112）Substitute；Incondensable gas in Air-Cooling Island and few
Measure steam and pass through preposition vacuum extractor（110）It is drawn into and vacuumizes condenser（111）, steam forms hydrophobic after supercooling
Via vacuumizing condenser draining valve（211）Drain into steam exhaust device of steam turbine（101）In；Incondensable gas is true by small-power water ring
Empty pump（112）Heel row is taken away to air；Raw water ring vacuum pump does not put into operation after being isolated；Now vacuumize condenser（111）Cooling
Water is steam turbine condensate（302）；
Operating mode two：The former pumped vacuum systems method of operation；
Specific workflow：Open raw water ring vacuum pump isolating door（201）, start raw water ring vacuum pump one（108）Or raw water ring
Vavuum pump two（109）Any one, stoppage in transit small-power water ring vacuum pump（112）, preposition vacuum extractor of stopping transport（110）, close
The preposition total isolating door of pumped vacuum systems（202）, close and vacuumize condensate isolating door before condenser（208）, closing vacuumizes cold
Condensate isolating door after condenser（209）, open and vacuumize condenser condensate bypass door（210）, whole pumped vacuum systems is switched to
Former pumped vacuum systems；
Operating mode three：Pumped vacuum systems, which is switched to, vacuumizes condenser（111）Raw water of connecting ring vacuum pump one（108）Or raw water ring is true
Empty pump two（109）；
Specific workflow：Open preposition vacuum extractor bypass door（204）, the preposition total isolating door of pumped vacuum systems（202）, close
Close preposition vacuum extractor isolating door（203）, open and vacuumize condenser front open type water segregation door（206）, vacuumize condenser
Opened water isolating door afterwards（207）, close preposition vacuum extractor（110）, small-power water ring vacuum pump（112）, open small-power
Water ring vacuum pump isolating door（205）, start raw water ring vacuum pump one（108）Or raw water ring vacuum pump two（109）, close raw water ring
Vavuum pump isolating door（201）；Incondensable gas and a small amount of steam in Air-Cooling Island is by vacuumizing condenser（111）, steam warp
Form hydrophobic via vacuumizing condenser draining valve after supercooling（211）Drain into steam exhaust device of steam turbine（101）In；Non-condensing gas
Body is by raw water ring vacuum pump one or raw water ring vacuum pump two（Heel row is taken away to air；Small water ring vacuum pump does not put into operation after being isolated；
Now vacuumize condenser（111）Cooling water is opened water（301）.
2. control method according to claim 1, wherein detection feedback signal can be the signal of single temperature point, or
Temperature field monitoring signals, or pressure-measuring-point signal, or flow measuring point signal.
3. control method according to claim 2, the calculating judge module, are main frame DCS logic functional blocks, or
PLC control modules, or the software program in server.
4. control method according to claim 3, preposition vacuum extractor（110）, it is steam jet ejector, or roots-type
Vavuum pump, high speed centrifugation vavuum pump.
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| CN107830742A (en) * | 2017-12-04 | 2018-03-23 | 武汉艾德沃泵阀有限公司 | A kind of system complete equipment that vacuum is kept for steam-condenser of thermal power plants |
| CN108050859A (en) * | 2017-12-29 | 2018-05-18 | 国电科学技术研究院有限公司 | A kind of fired power generating unit direct air cooling system |
| CN108106449A (en) * | 2017-12-15 | 2018-06-01 | 神华集团有限责任公司 | Air-cooling island cooling device and method |
| CN115434902A (en) * | 2022-11-07 | 2022-12-06 | 中国空气动力研究与发展中心超高速空气动力研究所 | High-flow high-vacuum air pumping system and design method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107830742A (en) * | 2017-12-04 | 2018-03-23 | 武汉艾德沃泵阀有限公司 | A kind of system complete equipment that vacuum is kept for steam-condenser of thermal power plants |
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| CN115434902A (en) * | 2022-11-07 | 2022-12-06 | 中国空气动力研究与发展中心超高速空气动力研究所 | High-flow high-vacuum air pumping system and design method thereof |
| CN115434902B (en) * | 2022-11-07 | 2022-12-30 | 中国空气动力研究与发展中心超高速空气动力研究所 | Design method of high-flow high-vacuum air pumping system |
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