CN107100853A - A kind of auxiliary power system for two-shipper backheat - Google Patents
A kind of auxiliary power system for two-shipper backheat Download PDFInfo
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- CN107100853A CN107100853A CN201710535170.3A CN201710535170A CN107100853A CN 107100853 A CN107100853 A CN 107100853A CN 201710535170 A CN201710535170 A CN 201710535170A CN 107100853 A CN107100853 A CN 107100853A
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- excitation
- exciter
- dynamotor
- motor
- speed
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/04—Units comprising pumps and their driving means the pump being fluid driven
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0066—Control, e.g. regulation, of pumps, pumping installations or systems by changing the speed, e.g. of the driving engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D5/00—Controlling water feed or water level; Automatic water feeding or water-level regulators
- F22D5/26—Automatic feed-control systems
- F22D5/32—Automatic feed-control systems influencing the speed or delivery pressure of the feed pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The present invention relates to field of thermal power, specially a kind of auxiliary power system for two-shipper backheat.A kind of auxiliary power system for two-shipper backheat, including small turbine, synchronous automatic clutch, feed pump, gear box A, AC excitation dynamotor, gear box B, permanent-magnet speed governor and exciter alternator, the said equipment passes sequentially through shaft coupling connection, AC excitation dynamotor stator side accesses high-voltage Auxiliary electric system, and provided with synchronous device, AC excitation loop is provided between AC excitation dynamotor and exciter alternator, adjustable resistance is provided with AC excitation loop, exciter alternator possesses its DC excitation system.The rotating speed control of feed pump, is to be controlled by the excitation frequency of motor, the power with motor is unrelated, rotating speed and power realize uneoupled control, is greatly lowered the difficulty that operation is controlled in the system.
Description
Technical field
It is specially that one kind is used to surpass the present invention relates to field of thermal power（It is super）Criticality benchmark EC-BEST (Echelon
Cycle-Backpressure Extraction Steam Turbine) two-shipper heat regenerative system the control of rotating speed-power decoupled
Small turbine-motor variable speed dual drive system, be also applied for the unit of traditional heat regenerative system, be especially suitable for boiler feed pump
Driving, be equally applicable to the variable speeds such as centrifugal fan, Silence Process axial fan driving, the drive of variable parameter operation equipment
It is dynamic, the load -response-speed of unit efficiency and two-shipper backheat unit can be improved.
Background technology
Due to the increasingly raising of energy-saving and emission-reduction requirement, fired power generating unit develops to higher efficiency direction, and improving steam parameter is
The important means of fired power generating unit generating efficiency is improved, the extra-supercritical unit reheat steam temperature that the country has put into operation at present has reached
620 DEG C, and develop to more high parameter, the continuous improvement of the steam turbine regenerative steam degree of superheat is brought therewith, and heat exchange entropy increases continuous increase
Big situation, especially intermediate pressure cylinder first paragraph are drawn gas, and situation is the most serious, and influence unit efficiency is further lifted.To solve this
Problem, further improves unit efficiency, and recent year develops extra-supercritical unit EC-BEST two-shipper heat regenerative systems（Referred to as
" two-shipper heat regenerative system "）, similar system is actually external more application in the sixties in last century, but later due to solidifying
Vapour formula small turbine（Referred to as " the small machine of pure condensate "）Development, water supply pump driving BEST small turbines（Back pressure-backheat of drawing gas
Small turbine, referred to as " the small machines of BEST "）Gradually replaced by the small machine of pure condensate, and two-shipper heat regenerative system unit Changing load-acceleration is slow, it is double
Machine heat regenerative system is gradually backed out the arena of history.Have benefited from the raising of the through-flow design level of the small machines of BEST at present, under equal conditions,
Traditional heat regenerative system using the small machine of pure condensate is less than using the therrmodynamic system heat consumption of the small machines of BEST, therefore, in recent years, two-shipper is returned
Hot systems cause extensive concern, but due to the tape splicing main steam turbine that draws gas of the small machines of BEST（Abbreviation main frame）High-pressure heater（Letter
Claim " height adds "）, when unit varying duty or unusual service condition feedwater flow fluctuate widely, the water level that height adds is difficult to control to, at present still
Confirm to have solved the control problem of the small machines of BEST without the case that engineering puts into operation.
In addition, with the increase of power network peak-valley difference, and a large amount of new energy access power networks, thermal power plant increasingly undertakes numerous
The peak regulation and frequency modulation task of weight, cause subsidiary engine more time off-design operating mode to be run, and frequent fluctuation, efficiency reduction, especially
It is that efficiency influence of the energy consumption level of the large-scale subsidiary engine such as feed pump, blower fan on unit is larger, it is also desirable to have new type of drive to carry
High subsidiary engine drive efficiency.
The content of the invention
The invention provides a kind of auxiliary power system for two-shipper backheat, it is possible to achieve whole shafting is transported in variable speed
Under the conditions of row, adjusted by motor（Power-loaded self-adaptive）The rotating speed of driven equipment, and small turbine（Include the small machines of BEST
With the small machine of pure condensate, abbreviation " small machine "）It can be run under admission valve standard-sized sheet mode, without regulation, make entering vapour, taking out for small machine
Vapour（The small machines of BEST）, exhaust steam flow keep stable.Due to the small machines of BEST draw gas be discharged into it is high plus, the stabilization of its steam flow can
So that two-shipper heat regenerative system is in unit variable load operation, will not Yin Gaojia problem of water level control, and have influence on unit varying duty
Speed；Due to small machine valve wide open, small machine is able to always work in close to design conditions, can also make unit（Returned including tradition
Heat engine group and two-shipper backheat unit）In the range of full load, subsidiary engine drive efficiency is set to be held in higher level；Regulated variable, such as
The rotating speed control of the control of boiler feedwater flow, i.e. feed pump, is controlled by the excitation frequency of motor, the power with motor
Unrelated, rotating speed and power realize uneoupled control, are greatly lowered the difficulty that operation is controlled.
The present invention adopts the following technical scheme that realization：A kind of auxiliary power system for two-shipper backheat, including it is small
Machine, synchronous automatic clutch（Abbreviation clutch）, feed pump, gear box A, AC excitation dynamotor（Abbreviation main motor）、
Gear box B, permanent-magnet speed governor and exciter alternator（Abbreviation exciter）, the said equipment pass sequentially through shaft coupling connection, main motor
Stator side accesses high-voltage Auxiliary electric system, and provided with synchronous device, AC excitation loop is provided between main motor and exciter,
AC excitation loop is provided with adjustable resistance, and exciter possesses its DC excitation system.
Operation principle：During unit is normally run, by adjusting permanent-magnet speed governor, to adjust the rotating speed of exciter, so as to change
Become the frequency that exciter exports alternating current, the rotor field frequency of main motor thus change, because the stator of main motor is returned
Power frequency station service electrical system is accessed on road, and the rotary speed of rotor is exactly the speed discrepancy of stator rotating excitation field and rotor rotating excitation field, because
This, the purpose for controlling shafting transfer rotor speed has been finally reached by controlling permanent-magnet speed governor.In shafting driving equipment and by
The shaft power equilibrium relation of driving equipment is such：The shaft power of feed pump has with its rotating speed and supply line drag characteristic
Close, small shaft power and steam parameter before its admission valve aperture and valve（Temperature, pressure）It is relevant, and steam parameter and main frame
Load it is relevant, the shaft power of main motor is relevant with the load that it undertakes, and at any one time, the power of all devices in shafting
Poised state is necessarily in, the difference of small machine and feed pump shaft power is undertaken by main motor, as long as this shaft power difference does not surpass
Go out main motor name plate rating, shafting can be and power just with safe and stable operation, the rotating speed control of the rotating speed of shafting, i.e. feed pump
What control was not associated, that is, uneoupled control is realized, the regulation quality of the DC excitation system of exciter can will in real time meet master
The excitation of motor needs, it is ensured that main motor is without departing from static stability limit.
The present invention can also adopt the following technical scheme that realization：A kind of auxiliary power system for two-shipper backheat, bag
Small machine, clutch, feed pump, gear box A, main motor are included, the said equipment passes sequentially through shaft coupling connection, main motor stator side joint
Enter high-voltage Auxiliary electric system, and provided with synchronous device, in addition to exciter, exciter motor（Referred to as " excitation electromotor "）With
Frequency converter, exciter and excitation electromotor are connected by shaft coupling, and exciter possesses its DC excitation system, main motor and exciter
Between be provided with AC excitation loop, the power supply of frequency converter is derived from low pressure station service electrical system, transducer drive excitation electromotor.
Operation principle：By frequency converter, to adjust the rotating speed of excitation electromotor, so as to change the frequency that exciter exports alternating current
Rate, the rotor field frequency of main motor thus changes, and because power frequency station service electrical system is accessed in the stator loop of main motor, turns
The rotary speed of son is exactly the speed discrepancy of stator rotating excitation field and rotor rotating excitation field, therefore, final by controlling frequency converter
The purpose of control shafting transfer rotor speed is reached.Driving equipment and the shaft power equilibrium relation of driven equipment are these in shafting
Sample：The shaft power of feed pump is relevant with its rotating speed and supply line drag characteristic, small shaft power and its admission valve aperture
It is relevant with steam parameter before valve, and steam parameter is relevant with the load of main frame, the load that the shaft power of main motor undertakes with it
It is relevant, and at any one time, the power of all devices is necessarily in poised state, the difference of small machine and feed pump shaft power in shafting
Volume is undertaken by main motor, as long as this shaft power difference is without departing from main motor name plate rating, shafting just can with safe and stable operation,
The rotating speed control of the rotating speed of shafting, i.e. feed pump is not associated with Power Control, that is, realizes uneoupled control, exciter it is straight
The regulation quality of stream excitation system can will in real time meet the excitation needs of main motor, it is ensured that main motor is without departing from static-stability pole
Limit.
The present invention can also adopt the following technical scheme that realization：A kind of auxiliary power system for two-shipper backheat, bag
Small machine, clutch, feed pump, gear box A and main motor are included, the said equipment passes sequentially through shaft coupling connection, in addition to frequency converter
And transformer, main motor stator side joint enters high-voltage Auxiliary electric system, and provided with synchronous device, the AC excitation of main motor is derived from height
Station service electrical system is pressed, excitation is provided it by frequency converter and transformer.
Operation principle：By frequency converter, to adjust the exciting current frequency of main motor rotor loop, the rotor magnetic of main motor
Field frequencies range thus changes, and because power frequency station service electrical system is accessed in the stator loop of main motor, the rotary speed of rotor is exactly
The speed discrepancy of stator rotating excitation field and rotor rotating excitation field, therefore, has been finally reached in control shafting by controlling frequency converter
The purpose of rotor speed, the effect of transformer is matching frequency converter output voltage, electric current and main motor rotor loop demand excitation
Voltage, electric current.Driving equipment and the shaft power equilibrium relation of driven equipment are such in shafting：The shaft power of feed pump with
Its rotating speed is relevant with supply line drag characteristic, and small shaft power is relevant with steam parameter before its admission valve aperture and valve,
And steam parameter is relevant with the load of main frame, the shaft power of main motor is relevant with the load that it undertakes, and at any one time, shafting
The power of middle all devices is necessarily in poised state, and the difference of small machine and feed pump shaft power is undertaken by main motor, as long as this
Individual shaft power difference without departing from main motor name plate rating, shafting just can with safe and stable operation, the rotating speed of shafting, i.e. feed pump
Rotating speed control is not associated with Power Control, that is, realizes uneoupled control, the regulation quality of the AC excitation system of main motor
Its excitation needs can be met in real time, it is ensured that main motor is without departing from static stability limit.
The present invention can also adopt the following technical scheme that realization：A kind of auxiliary power system for two-shipper backheat, bag
Include the small machine of feed pump, BEST, the speed change clutch with blocking function（Equivalent to gear-box+with blocking function it is synchronous it is automatic from
Clutch, referred to as " speed change clutch "）And main motor, the said equipment passes sequentially through shaft coupling connection, and main motor stator side joint enters height
Station service electrical system is pressed, and provided with synchronous device, the steam discharge of the small machines of BEST accesses oxygen-eliminating device and solidifying by valve A and valve B respectively
Vapour device（Or steam exhaust device）, in addition to exciter, excitation electromotor and frequency converter, exciter and excitation electromotor are connected by shaft coupling
Connect, exciter possesses its DC excitation system, AC excitation loop is provided between main motor and exciter, the power supply of frequency converter takes
From low pressure station service electrical system, transducer drive excitation electromotor.
The present invention can still adopt the following technical scheme that realization：A kind of auxiliary power system for two-shipper backheat, bag
Feed pump, the small machine of pure condensate, speed change clutch and main motor are included, the said equipment passes sequentially through shaft coupling connection, main motor stator side
High-voltage Auxiliary electric system is accessed, and provided with synchronous device, the steam discharge of the small machine of pure condensate accesses condenser by valve B（Or steam discharge dress
Put）, cooling steam passes through valve C and accesses the small machine cylinder body of pure condensate, in addition to exciter, exciter motor and frequency converter, exciter
Connected with excitation electromotor by shaft coupling, exciter possesses its DC excitation system, be provided with and exchange between main motor and exciter
Energized circuit, the power supply of frequency converter is derived from low pressure station service electrical system, transducer drive excitation electromotor.
Above-mentioned 2 technical scheme operation principles are identical with preceding 3 technical schemes, and difference is, feed pump is located at axle
One end of system, using the technical scheme when feed pump can not be designed using Double shaft-extension, the mode that main motor first starts, small machine can not
Deviate from from shafting, can only be rotated with whole shafting.
The beneficial effects of the invention are as follows：
1）The subsidiary engine driving of prior art typically uses single power, and driving equipment will have certain allowance, with Power Plant Feedwater pump
Exemplified by, the feed pump design of direct current cooker will meet unit 105%BMCR（Drum boiler is 110%BMCR）The demand of operating mode, and drive
The small machine of dynamic feed pump will also have certain allowance relative to feed pump, and during unit oepration at full load, feed pump shaft power is about
80% or so of design conditions, unit is in 50% load operation, and the 20% of feed pump shaft underpower design conditions, and small machine
The shaft power adaptable with this is kept, substantial deviation design conditions influence very big to efficiency.According to the technical side of the present invention
Case, small machine can keep valve wide open to run, in the range of unit full load, consistently remain close to design conditions operation, keep
Higher operational efficiency, the regulation of speed of feedwater is completed by the adjustment of field excitation of electrical system.
2）The feed-water pump of prior art, generally requires setting and starts pump or start stand-by pump, and the technology of the present invention
Scheme need not set startup pump or open standby pump, during unit starting, run by main motor with motor working condition, drive feed pump,
Unit starting process is completed, now, clutch is in disengaged condition, small machine is cut off from shafting, feed pump is individually by main electricity
Machine drives（Now, gear box A is in speedup mode of operation）.When unit reaches certain load, using the teaching of the invention it is possible to provide when enough vapour sources,
Small machine puts into operation, clutch engagement, drives feed pump, with the change of main unit load, when small shaft power is more than feed pump
During required shaft power, main motor is in generating state（Now, gear box A is in decelerating operation pattern）, conversely, in electronic shape
State.
3）Present invention is particularly suitable for the use of two-shipper heat regenerative system, the small machines of BEST, due to tape splicing main frame height plus, existing
In technical scheme, feed pump is operated alone in small machine, and working conditions change is more violent, and the height position that adds water is difficult to control to, thus, main unit load
Change, i.e., peak modulation capacity is weakened, and technical scheme, and small machine need not be adjusted（Admission valve standard-sized sheet）, therefore,
The peak modulation capacity of unit is not interfered with not only, and can also improve unit efficiency.
Brief description of the drawings
Fig. 1 is small turbine-motor variable speed dual drive feed-water pump schematic diagram of exciter Driven by Coaxial.
Fig. 2 is small turbine-motor variable speed dual drive feed-water pump signal that exciter is driven by excitation electromotor
Figure.
The small turbine that Fig. 3 is provided for excitation by station service frequency conversion-motor variable speed dual drive feed-water pump signal
Figure.
Fig. 4 is the small machines of BEST-motor variable speed dual drive feed-water pump that exciter is driven by excitation electromotor（Feed pump
Positioned at shafting one end）Schematic diagram.
Fig. 5 is the small machine of pure condensate-motor variable speed dual drive feed-water pump that exciter is driven by excitation electromotor（Feed pump
Positioned at shafting one end）Schematic diagram.
In figure：1- small turbines, 2- synchronization automatic clutches, 3- feed pumps, 4- gear box As, the electronic hair of 5- AC excitations
Motor, 6- gear box Bs, 7- permanent-magnet speed governors, 8- exciter alternators, 9- exciter motors, 10- frequency converters, 11- transformations
Device, the small machines of 12-BEST, 13- speed change clutch, the small machine of 14- pure condensates, 15- synchronous devices.
Embodiment
Embodiment 1：As shown in figure 1, being designed using the present invention program, design parameter can flexibly be selected according to requirement of engineering
Select, such as demand feed pump design speed scope is 3000~6000rpm（Correspondence AC excitation frequency range is 40~30hz, right
It is 89.3%~33.5% to answer permanent-magnet speed governor output speed scope）, the fast ratio of gear box A can be used for 5, the main motor range of speeds
It is that 1, exciter magnetic pole logarithm is the design that 2, gear box B speed ratio is 2.293 for 600~1200rpm, main motor magnetic pole logarithm,
Also can be according to technical conditions, preferably other specification such as the critical speeds and carbon brush slip-ring of main motor.
Small turbine-motor variable speed dual drive feed-water pump of Fig. 1 signals rotating speed-power decoupled control（Exciter
Driven by Coaxial）.
During feedwater pump startup, small machine can be selected first to start, or the mode that main motor first starts.
When small machine first starts, small machine red switch, clutch is engaged, and all devices turn in drive feed pump, main motor and shafting
It is dynamic, to 2800rpm（Typically under the rotating speed, small machine starts and terminated, and small machine switchs to unit DCS by MEH controls and controlled）, keep turning
Speed is stable to carry out electric operation, now motor speed 560rpm, permanent-magnet speed governor input rotating speed 1284rpm, and regulation permanent magnetism is adjusted
Fast device output speed is to 1220rpm（About output speed 95%）, exciter, which is opened, encourages, now, and exciter output AC excitation frequency is about
40.67hz, adds main motor rotor mechanical separator speed, and the electricity that frequency is 50hz can be thus induced in main motor stator loop
Pressure, is examined after the same period by synchronous device, and switch closes a floodgate, and stator loop is connected, and main motor is directly accessed high-voltage Auxiliary electric system.Treat
Small machine is switched to after unit DCS controls by MEH controls.Rotating speed control enters steam control valve control by small machine, is changed into electric loop
Frequency Converter Control, continue raising speed, it is interval to the speed of feedwater of water management into unit（Generally 3000~6000rpm）,
With the increase of feed pump capacity, small machine progressively can be entered into steam control valve progressively to standard-sized sheet, reach maximum energy-saving state.
When main motor first starts, throw-out-of clutch, small machine rotor is remained static, and feed pump liter is driven by main motor
Speed.Adjustable resistance in main motor rotor AC excitation loop is adjusted to the larger state of resistance, the rotor windings loop of main motor
By adjustable resistance, carbon brush and slip ring, a closed-loop path is formed with the stator loop of exciter, equivalent to Wound-rotor asynchronous electricity
Machine, switch is closed a floodgate, and stator loop is connected, and main motor is directly accessed high-voltage Auxiliary electric system, adjusts adjustable resistance, controls main motor
Rotating speed is maintained at about 560rpm（Also other rotating speeds may be selected）, the exciting current about 40.67hz of now rotor loop sensing, permanent magnetism
Speed regulator input rotating speed 1284rpm, regulation permanent-magnet speed governor output speed 1220rpm（About output speed 95%）, exciter
Qi Li, exciter also produces the AC excitation electric current of identical frequency, is stepped up the direct current magnetic force electric current of exciter, makes main motor
AC excitation be transitioned into and provided by exciter by speed discrepancy sensing, while progressively regulation reduces the resistance of adjustable resistance, until
Excision, makes the control of main motor rotating speed switch to permanent-magnet speed governor control by adjustable resistance control.Progressively reduce permanent-magnet speed governor output
Rotating speed, main motor continues raising speed, interval to the speed of feedwater of water management into unit（Generally 3000~6000rpm）, it is small
After equipment is for red switch condition, red switch, raising speed, until clutch engagement, synchronous with speed of feedwater holding, afterwards, continues out big
Small machine enters steam control valve, until standard-sized sheet.
Embodiment 2：As shown in Fig. 2 being designed using the present invention program, design parameter can flexibly be selected according to requirement of engineering
Select, such as demand feed pump design speed scope is 3000~6000rpm（Correspondence AC excitation frequency range is 40~30hz, right
It is 40.4~30.3hz to answer frequency converter adjustable range, and excitation electromotor uses asynchronous machine, and its revolutional slip is according to 1% measuring and calculating）, can be with
Gear box A speed is used than being that 600~1200rpm, main motor magnetic pole logarithm are 1, exciter magnetic pole for 5, the main motor range of speeds
Logarithm is that 2, excitation electromotor magnetic pole logarithm is 2, also can be according to technical conditions such as the critical speeds and carbon brush slip-ring of main motor, preferably
Other specification.
In the present embodiment, the permanent-magnet speed governor or fluid-flywheel clutch set between exciter and excitation electromotor
Deng other speed control devices.
Small turbine-motor variable speed dual drive feed-water pump of Fig. 2 signals rotating speed-power decoupled control（Exciter
Driven by excitation electromotor）.
During feedwater pump startup, small machine can be selected first to start, or the mode that main motor first starts.
When small machine first starts, small machine red switch, clutch is engaged, and all devices turn in drive feed pump, main motor and shafting
It is dynamic, it can select in small machine rotating speed 2800rpm（Also other rotating speeds may be selected, but rotating speed will be stablized）Shi Jinhang electric operations, this
When main motor rotating speed 560rpm, start excitation electromotor, regulation frequency converter output frequency be about 41.08hz, make exciter rotating speed protect
Hold in 1220rpm, exciter, which is opened, encourages, now, exciter output AC excitation frequency about 40.67hz adds main motor rotor machine
Tool rotating speed, the voltage that frequency is 50hz can be thus induced in main motor stator loop, is examined by synchronous device after the same period, fixed
Sub-loop is connected, and main motor is directly accessed high-voltage Auxiliary electric system.Small machine is treated by MEH controls, is switched to after unit DCS controls.It
Afterwards, rotating speed control continues raising speed, into machine by the Frequency Converter Control entered steam control valve control, be changed into electric loop of small machine
Group is interval to the speed of feedwater of water management（Generally 3000~6000rpm）, with the increase of feed pump capacity, can progressively by
Small machine enters steam control valve progressively to standard-sized sheet, reaches maximum energy-saving state.
When main motor first starts, throw-out-of clutch, small machine rotor is remained static, and feed pump liter is driven by main motor
Speed.Excitation electromotor is started by frequency converter, the output frequency of frequency converter is adjusted in 50.5hz, excitation electromotor rotating speed about 1500rpm
（Calculate according to revolutional slip 1%）, exciter, which is opened, is encouraged, and the voltage that frequency is 50hz can be thus induced in main motor stator loop,
Examined by synchronous device after the same period, stator loop is connected, main motor is directly accessed high-voltage Auxiliary electric system.Gradually reduce frequency converter
Output frequency, main motor is since static and continues raising speed, interval to the speed of feedwater of water management into unit（Generally
3000~6000rpm）, after small equipment is for red switch condition, red switch, raising speed, until clutch engagement, keeps same with speed of feedwater
Step, afterwards, continues out size machine and enters steam control valve, until standard-sized sheet.
In the present embodiment, permanent-magnet speed governor can be also set between exciter and excitation electromotor（Or fluid-flywheel clutch etc. its
His speed control device）, exciter rotating speed is adjusted by permanent-magnet speed governor, and substitute the effect of frequency converter.
Embodiment 3：As shown in figure 3, being designed using the present invention program, design parameter can flexibly be selected according to requirement of engineering
Select, such as demand feed pump design speed scope is 3000~6000rpm（Correspondence AC excitation frequency range is 40~30hz）, can
, also can root to use gear box A speed than the design for being 1 as 600~1200rpm, motor pole logarithm for 5, range of motor speeds
The technical conditions, preferably other specification such as critical speed and carbon brush slip-ring according to motor.
Small turbine-motor variable speed dual drive feed-water pump of Fig. 3 signals rotating speed-power decoupled control（Excitation by
Station service frequency conversion is provided）.
During feedwater pump startup, small machine can be selected first to start, or the mode that main motor first starts.
When small machine first starts, small machine red switch, clutch is engaged, and all devices turn in drive feed pump, main motor and shafting
It is dynamic, it can select in small machine rotating speed 2800rpm（Also other rotating speeds may be selected, but rotating speed will be stablized）Shi Jinhang electric operations, this
When main motor rotating speed 560rpm, put into AC excitation, regulation frequency converter output frequency be about 40.67hz, add main motor rotor
Mechanical separator speed, the voltage that frequency is 50hz can be thus induced in main motor stator loop, is examined by synchronous device after the same period,
Stator loop is connected, and main motor is directly accessed high-voltage Auxiliary electric system.Small machine is treated by MEH controls, is switched to after unit DCS controls.
Afterwards, rotating speed control continues raising speed by the Frequency Converter Control entered steam control valve control, be changed into electric loop of small machine, enters
Unit is interval to the speed of feedwater of water management（Generally 3000~6000rpm）, can be progressively with the increase of feed pump capacity
Small machine is entered into steam control valve progressively to standard-sized sheet, maximum energy-saving state is reached.
When main motor first starts, throw-out-of clutch, small machine rotor is remained static, and feed pump liter is driven by main motor
Speed.AC excitation is put into, regulation frequency converter output frequency is 50hz, and thus can induce frequency in main motor stator loop is
50hz voltage, is examined after the same period by synchronous device, and stator loop is connected, and main motor is directly accessed high-voltage Auxiliary electric system.By
Step reduction frequency converter output frequency, main motor is since static and continues raising speed, into speed of feedwater of the unit to water management
It is interval（Generally 3000~6000rpm）, after small equipment is for red switch condition, red switch, raising speed, until clutch engagement, with feedwater
Revolution speed keeps synchronous, afterwards, continues out size machine and enters steam control valve, until standard-sized sheet.
Gear box A or speed change clutch in above-described embodiment 1,2,3, clutch are preferentially arranged on gear-box
Speed end, clutch engagement and during locking is equivalent to gear box A, during throw-out-of clutch, feedwater can be operated alone in small machine
Pump, equivalent to existing technical scheme, can not influence unit operation in the case of electrical malfunction.
Embodiment 4：As shown in figure 4, being designed using the present invention program, design parameter can flexibly be selected according to requirement of engineering
Select, such as demand feed pump design speed scope is 3000~6000rpm（Correspondence AC excitation frequency range is 40~30hz）, can
To use the design that speed change clutch speed ratio is 1 as 600~1200rpm, motor pole logarithm for 5, range of motor speeds（Main electricity
The excitation system of machine is identical with the technical scheme in embodiment 2）, also can be according to technologies such as the critical speeds and carbon brush slip-ring of motor
Condition, preferably other specification.
During feedwater pump startup, the small machines of BEST can be selected first to start, or the mode that main motor first starts.The small machines of BEST are first opened
It is identical with embodiment 1,2,3 when dynamic.When main motor first starts, electrical system control and embodiment 1,2,3 also complete phase
Together, difference is, main motor first starts, when driving feedwater pump operation, also simultaneously with the small machine synchronous rotaries of BEST, now
Need the small machine admission valves of BEST and the valve Close All that draws gas, the valve A of steam discharge to oxygen-eliminating device is closed, and the small machines of BEST send axle envelope
Steam, the valve B of steam discharge to condenser is opened, and the small machines of BEST keep vacuumizing state, prevent rotor air blast from overheating.Main motor list
Under only type of drive, general feed pump keeps appropriate fixed rotating speed, can select about 3000rpm or so or other suitable turn
Speed, speed of feedwater will meet unit starting, until unit reaches certain load, main frame high pressure cylinder steam discharge parameter disclosure satisfy that
The small machine red switch conditions of BEST.In the case where meeting feedwater demand pump, selection of speed is as low as possible, and using constant speed operation, uses
Feed water by-pass adjusts valve regulation feedwater flow.After the small equipments of BEST are for red switch condition, the small machines of BEST enter steam control valve and progressively opened
Open, start, into vapour, to undertake and exert oneself, when condition is met, progressively close valve B, the opening small machine steam discharge of valve A, BEST, which is switched to, to be removed
Oxygen device, before the small shaft powers of BEST exceed shaft power needed for feed pump, speed change clutch locking prevents the small machines of BEST from entering vapour
Regulating valve is progressively opened greatly, until during standard-sized sheet, after main motor shaft power reduction to zero, speed change clutch is disengaged.Above-mentioned mistake
Cheng Zhong, speed of feedwater is all the time by electric loop control.
Embodiment 5：As shown in figure 5, being designed using the present invention program, design parameter can flexibly be selected according to requirement of engineering
Select, such as demand feed pump design speed scope is 3000~6000rpm（Correspondence AC excitation frequency range is 40~30hz）, can
To use the design that speed change clutch speed ratio is 1 as 600~1200rpm, motor pole logarithm for 5, range of motor speeds（Main electricity
The excitation system of machine is identical with the technical scheme in embodiment 2）, also can be according to technologies such as the critical speeds and carbon brush slip-ring of motor
Condition, preferably other specification.
During feedwater pump startup, the small machine of pure condensate can be selected first to start, or the mode that main motor first starts.The small machine of pure condensate is first opened
It is identical with embodiment 1,2,3 when dynamic.When main motor first starts, electrical system control and embodiment 1,2,3 also complete phase
Together, difference is, main motor first starts, when driving feedwater pump operation, also simultaneously with the small machine synchronous rotary of pure condensate, now
The small machine admission valve Close All of pure condensate is needed, the small machine of pure condensate send gland steam, and the valve B of steam discharge to condenser is opened, pure condensate
Small machine is kept vacuumizing state, and valve C is opened, and sends into cooling steam, prevents rotor air blast from overheating（The small machine blades of BEST are shorter,
Rim velocity is smaller, can be not provided with cooling steam system, and the small several grade blades in machine end of pure condensate are longer, and rim velocity is larger）.Main motor
It is operated alone under mode, general feed pump keeps appropriate fixed rotating speed, can select in about 3000rpm or so, speed of feedwater
Unit starting is met, until unit load reaches to a certain degree, main frame high pressure cylinder steam discharge parameter disclosure satisfy that the small machine punching of pure condensate
Turn condition, in the case where meeting feedwater demand pump, selection of speed is as low as possible, and using constant speed operation, feed water by-pass regulation
Valve regulation feedwater flow.After the small equipment of pure condensate is for red switch condition, the small machine of pure condensate enters steam control valve and progressively opened, and starts into vapour,
Undertake and exert oneself, close valve C, cut off cooling steam, before the small shaft power of pure condensate exceedes shaft power needed for feed pump, speed change
Clutch locking, prevents the small machine of pure condensate from entering steam control valve and progressively opening greatly, until during standard-sized sheet, main motor shaft power reduction is extremely
After zero, speed change clutch is disengaged.In said process, speed of feedwater is all the time by electric loop control.
Excitation mode in embodiment 4,5 is in the same manner as in Example 2, can also be identical with embodiment 1,3.
Small machine of the present invention（Include the small machines of BEST and the small machine of pure condensate）It can also be other kinds of power-equipment, be driven
Dynamic equipment can be the equipment of other variable speeds control such as feed pump or blower fan, be equally applicable to other industry similar
The equipment of demand.
Claims (5)
1. a kind of auxiliary power system for two-shipper backheat, it is characterised in that including small turbine（1）, synchronous automatic clutch
（2）, feed pump（3）, gear box A（4）, AC excitation dynamotor（5）, gear box B（6）, permanent-magnet speed governor（7）And synchronization
Exciter（8）, the said equipment pass sequentially through shaft coupling connection, AC excitation dynamotor（5）Stator side accesses high-voltage Auxiliary
Electric system, and provided with synchronous device（15）, AC excitation dynamotor（5）With exciter alternator（8）Between encouraged provided with exchange
Magnetic loop, adjustable resistance, exciter alternator are provided with AC excitation loop（8）Possess its DC excitation system.
2. a kind of auxiliary power system for two-shipper backheat, it is characterised in that including small turbine（1）, synchronous automatic clutch
（2）, feed pump（3）, gear box A（4）, AC excitation dynamotor（5）, the said equipment pass sequentially through shaft coupling connection, hand over
Flow exciter motorgenerator（5）Stator side accesses high-voltage Auxiliary electric system, and provided with synchronous device（15）, in addition to synchronous excitation
Machine（8）, exciter motor（9）And frequency converter（10）, exciter alternator（8）With exciter motor（9）Pass through shaft coupling
Device is connected, exciter alternator（8）Possess its DC excitation system, AC excitation dynamotor（9）With exciter alternator（8）It
Between be provided with AC excitation loop, frequency converter（10）Power supply be derived from low pressure station service electrical system, transducer drive exciter driving electricity
Machine.
3. a kind of auxiliary power system for two-shipper backheat, it is characterised in that including small turbine（1）, synchronous automatic clutch
（2）, feed pump（3）, gear box A（4）, AC excitation dynamotor（5）, the said equipment pass sequentially through shaft coupling connection, also
Including frequency converter（10）And transformer（11）, AC excitation dynamotor（5）Stator side accesses high-voltage Auxiliary electric system, and sets
There is synchronous device（15）, AC excitation dynamotor（5）AC excitation be derived from high-voltage Auxiliary electric system, pass through frequency converter
（10）And transformer（11）Provide it excitation.
4. a kind of auxiliary power system for two-shipper backheat, it is characterised in that including feed pump（3）, the small machines of BEST（12）, band
The speed change clutch of blocking function（13）With AC excitation dynamotor（5）, the said equipment pass sequentially through shaft coupling connection, hand over
Flow exciter motorgenerator（5）Stator side accesses high-voltage Auxiliary electric system, and provided with synchronous device（15）, the small machines of BEST（12）'s
Steam discharge accesses oxygen-eliminating device and condenser or steam exhaust device, in addition to exciter alternator by valve A and valve B respectively（8）, excitation
Machine motor（9）And frequency converter（10）, exciter alternator（8）With exciter motor（9）Connected by shaft coupling, it is synchronous
Exciter（8）Possess its DC excitation system, AC excitation dynamotor（5）With exciter alternator（8）Between provided with exchange
Energized circuit, frequency converter（10）Power supply be derived from low pressure station service electrical system, frequency converter（10）Drive exciter motor（9）.
5. a kind of auxiliary power system for two-shipper backheat, it is characterised in that including feed pump（3）, the small machine of pure condensate（14）, band
The speed change clutch of blocking function（13）With AC excitation dynamotor（5）, the said equipment pass sequentially through shaft coupling connection, hand over
Flow exciter motorgenerator（5）Stator side accesses high-voltage Auxiliary electric system, and provided with synchronous device（15）, the small machine of pure condensate（14）'s
Steam discharge accesses condenser or steam exhaust device by valve B, and cooling steam accesses the small machine cylinder body of pure condensate by valve C, in addition to same
Walk exciter（8）, exciter motor（9）And frequency converter（10）, exciter alternator（8）With exciter motor（9）It is logical
Cross shaft coupling connection, exciter alternator（8）Possess its DC excitation system, AC excitation dynamotor（5）With synchronous excitation
Machine（8）Between be provided with AC excitation loop, frequency converter（10）Power supply be derived from low pressure station service electrical system, frequency converter（10）Driving is encouraged
Magnetomechanical motor（9）.
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| CN201710535170.3A CN107100853A (en) | 2017-07-04 | 2017-07-04 | A kind of auxiliary power system for two-shipper backheat |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710535170.3A CN107100853A (en) | 2017-07-04 | 2017-07-04 | A kind of auxiliary power system for two-shipper backheat |
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| CN201710535170.3A Pending CN107100853A (en) | 2017-07-04 | 2017-07-04 | A kind of auxiliary power system for two-shipper backheat |
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| CN109404885A (en) * | 2018-10-30 | 2019-03-01 | 大唐桂冠合山发电有限公司 | Supercritical coal-fired units water system |
| CN111412023A (en) * | 2020-04-03 | 2020-07-14 | 荣信汇科电气技术有限责任公司 | Coordination control method for realizing stable operation of steam-electricity dual-drive system |
| CN112983876A (en) * | 2021-04-08 | 2021-06-18 | 西安热工研究院有限公司 | Steam-electricity double-drive system of indirect air cooling unit induced draft fan based on double-feed system |
| CN112983567A (en) * | 2021-04-08 | 2021-06-18 | 西安热工研究院有限公司 | Direct air cooling unit electric induced draft fan system based on double-fed system |
| CN112983877A (en) * | 2021-04-08 | 2021-06-18 | 西安热工研究院有限公司 | Indirect air cooling unit electric induced draft fan system based on double-fed system |
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| CN113090544A (en) * | 2021-04-08 | 2021-07-09 | 西安热工研究院有限公司 | Direct air cooling unit vapour electricity double-drive feed pump system based on double-fed system |
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| CN113847824A (en) * | 2021-09-18 | 2021-12-28 | 西安热工研究院有限公司 | System and method for adjusting cooling water amount of independent condenser of small turbine of water feeding pump |
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| CN112983876A (en) * | 2021-04-08 | 2021-06-18 | 西安热工研究院有限公司 | Steam-electricity double-drive system of indirect air cooling unit induced draft fan based on double-feed system |
| CN113090542A (en) * | 2021-04-08 | 2021-07-09 | 西安热工研究院有限公司 | Steam-electricity double-drive water pump system of indirect air cooling unit based on double-feed system |
| CN113107878A (en) * | 2021-04-08 | 2021-07-13 | 西安热工研究院有限公司 | Double-fed system-based primary frequency modulation electric induced draft fan system of wet cooling unit |
| CN113236525A (en) * | 2021-06-11 | 2021-08-10 | 西安热工研究院有限公司 | Method for transforming steam-driven water feeding pump into double-fed motor driven water feeding pump and starting method |
| CN113847824A (en) * | 2021-09-18 | 2021-12-28 | 西安热工研究院有限公司 | System and method for adjusting cooling water amount of independent condenser of small turbine of water feeding pump |
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| CN114837761A (en) * | 2022-05-06 | 2022-08-02 | 西安热工研究院有限公司 | Frequency conversion system for improving internet power and working method |
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