CN107246807A - Efficiently adjustable vacuum control method and system for power plant - Google Patents
Efficiently adjustable vacuum control method and system for power plant Download PDFInfo
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- CN107246807A CN107246807A CN201710484629.1A CN201710484629A CN107246807A CN 107246807 A CN107246807 A CN 107246807A CN 201710484629 A CN201710484629 A CN 201710484629A CN 107246807 A CN107246807 A CN 107246807A
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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
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- 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 relates to a kind of efficiently adjustable vacuum control method and system for power plant, methods described includes：By being acquired calculating analysis to vacuum influence parameter, and pass through necessary amendment, show that real-time condenser vacuum should reach value.And high-efficiency vacuum pump group executing agency is delivered to using norm vacuum as regulating command by control unit, high-efficiency vacuum pump group input-output power is adjusted, should being inputted up to the minimum power of vacuum and vacuum pump group for unit is obtained.Displacement type main pump designs gas cooler with water ring pump front end, and intake-gas is cooled down to improve pump group efficiency.Vacuum pump group capacity selection is carried out according to unit displacement correspondence standard, it is ensured that can continuously extract the different operating mode on-condensible gases of unit out, by changing main pump incoming frequency, realize that pump group integral suction flow trim is adjusted.
Description
Technical field
Maintained the present invention relates to plant condenser vacuum and energy-saving field, and in particular to a kind of for the efficient adjustable of power plant
Whole vacuum control method and system.
Background technology
Turbine condenser is the important component in thermal power plant, and low-temperature receiver is played in condensing-type unit thermodynamic cycle
Effect, turbine discharge condenses in condenser, and forms in condenser vacuum, and steam condensation Cheng Shuihou continues to deliver to pot
Furnace system, completes thermodynamic cycle.Unit vacuum is to influence one of important indicator of unit economy and security.Entering steam temperature
In the case that degree is constant, turbine discharge temperature often reduces by 10 DEG C, and the thermal efficiency of unit about increases by 3.5%；In unit safety
In back pressure ranges, when back pressure often changes ± 1kPa, steam turbine power changes about ± 1%~2%, and this is considerable in power plant
's.If unit vacuum is too low, the effective enthalpy drop of steam in the unit can be not only caused to reduce, thermal efficiency of cycle declines, also
Turbine discharge temperature can be caused to raise, exhaust casing deformation and bearing centre change the failures such as caused vibration.In practice,
Condenser vacuum reduction also causes other to endanger, for example, cause to condense water oxygen level increase, condensate system equipment and pipe
The be corroded iron oxide of generation of road enters boiler, it will equipment and the pipeline such as corrosion water-cooling wall, superheater.
Not only improved recently as power plant for energy conservation emission reduction requirement, in the case of functions of the equipments are ensured, use more small-power
Equipment, can reduce plant consumption.Power plant's original design high-capacity vacuum pump mainly considers that the unit starting stage extracts condenser
Vacuum time is set up in interior air, shortening.To be formed because condenser vacuum relies primarily on turbine discharge and condensed, unit is normally run
When, Steam Condenser Leak rate very little, required vavuum pump rate of air sucked in required is much smaller than and sets up vacuum stages, therefore the unit operation stage can use
Small-power vacuum maintains system.
Some power plant attempt to transform vacuum system in recent years, and selected vacuum pump group is generally to adjust the unit operation stage
Mass flow of drawing gas is tried to achieve, or according to declared working condition vacuum design.And in actual set running, by environment and equipment because
Element restriction, unit is difficult to keep the specified vacuum operation of design, it is also difficult to reach unit optimum vacuum by pumped vacuum systems.And
As unit vacuum changes, also great changes will take place for vavuum pump suction flow, it is difficult to maintains design conditions.
In unit starting stage or some experiment demands, it is often necessary to change unit vacuum values to adapt to operational requirements, mesh
Preceding power plant is generally using air admission valve or the manual drain valve destruction vacuum conditions back pressure of vacuum main pipe, due to air admission valve valve
Position actuating length is big and hand-operated valve is difficult to control to, and is all made a big impact to unit operation security.
In view of above-mentioned, the design people is actively subject to research and innovation, a kind of for the efficiently adjustable true of power plant to found
Empty control method and system, make it with more the value in industry.
The content of the invention
In order to solve the above technical problems, the purpose of the present invention is that one kind is simple in construction, save the energy, highly versatile to provide
Be used for the efficiently adjustable vacuum-control(led) system of power plant.
To reach drawing gas on above-mentioned purpose, efficiently adjustable vacuum control method of the present invention for power plant, condenser
Bleeding point is connected to main vapor extraction device, and the main vapor extraction device includes passing through main extraction line and taking out on the condenser
The positive-displacement vacuum pump of steam ports connection, the positive-displacement vacuum pump is serially connected with final stage water circulation vavuum pump；The positive displacement vacuum
Pump is electrically connected with variable-frequency motor, and the positive-displacement vacuum pump is driven by variable-frequency motor, and the variable-frequency motor connects controller；Institute
The vacuum control method of condenser is stated, including：
The parameter of collection influence condenser vacuum, the parameter includes：Condenser cooling water inflow temperature tw1, steam turbine coagulate
Vapour amount, into condenser quantity of steam sum Dc, condenser cooling water flow DW；
Value should be reached by calculating real-time condenser vacuum, and value and the real-time vacuum values of current condenser should be reached by comparing condenser vacuum,
Controller should export the control instruction of variable-frequency motor according to condenser vacuum up to value, pass through variable-frequency motor volume adjusted formula vavuum pump
Input, power output, described real-time condenser vacuum should be up to value calculation formula：
ts=Δ t+ δt+tw1
In formula：P0For the norm vacuum tried to achieve, kPa；
PsPressure, kPa are calculated for condenser；
To calculate pressure P by condensersIt is P with the independent variable that history actual pressure is fitteds, dependent variable be P0Experience
Function, it is ensured that the norm vacuum of calculating is not less than former vacuum system and sets up vacuum level；
tsFor the saturated-steam temperature corresponding with condenser pressure, DEG C；
Δ t is temperature rise of the cooling water in condenser, DEG C；
tw1For condenser cooling water inflow temperature, DEG C；
DcFor steam turbine condensing amount, to enter condenser quantity of steam sum, kg/s；
DwFor cooling water flow, kg/s；
K is the total heat transfer coefficient of cooling water, using design definite value, kW/ (m2·℃)；
AcFor the film-cooled heat of condenser, using design definite value, m2；
δtFor terminal temperature difference in condenser, DEG C.
Further, the adjusting method of variable-frequency motor includes：By the norm vacuum tried to achieve and current unit vacuum values ratio
Compared with both differences deliver to displacement pump variable-frequency motor volume adjusted formula vacuum revolution speed, if unit as variable input instruction
Current vacuum level then improves positive-displacement vacuum pump rotating speed, if unit current vacuum level is high less than the norm vacuum calculated
In the norm vacuum of calculating, then positive-displacement vacuum pump rotating speed is reduced, until both are consistent.
To reach above-mentioned purpose, the present invention is used for the efficiently adjustable vacuum-control(led) system of power plant, including：
The bleeding point that draws gas on condenser, the condenser is connected to main vapor extraction device and standby vapor extraction device, its
Described in main vapor extraction device include the positive-displacement vacuum pump that is connected with the extraction opening on the condenser by main extraction line, institute
State positive-displacement vacuum pump and be serially connected with final stage water circulation vavuum pump；Main steam line between the positive-displacement vacuum pump and condenser
It is provided with first switch valve；The positive-displacement vacuum pump is electrically connected with variable-frequency motor, and the positive-displacement vacuum pump passes through
Variable-frequency motor drives；Measuring unit is connected with the condenser, the measuring unit includes：Measure condenser cooling water water inlet
The temperature sensor of temperature, into the steam pressure sensor and measurement condenser cooling water flow of inlet water of condenser quantity of steam
Flow sensor；Described temperature sensor, steam pressure sensor and flow sensor connects the controller respectively；
The variable-frequency motor passes through controller control；
The measuring unit, collection condenser cooling water inflow temperature tw1, steam turbine condensing amount, into condenser quantity of steam
Sum Dc, condenser cooling water flow DW；
The controller, value should be reached for calculating real-time condenser vacuum, and comparing condenser vacuum should be up to value and currently solidifying
The real-time vacuum values of vapour device, controller should export the control instruction of variable-frequency motor according to condenser vacuum up to value, pass through variable-frequency motor
The input of volume adjusted formula vavuum pump, power output, wherein described real-time condenser vacuum should be up to value calculation formula：
ts=Δ t+ δt+tw1
In formula：P0For the norm vacuum tried to achieve, kPa；
PsPressure, kPa are calculated for condenser；
To calculate pressure P by condensersIt is P with the independent variable that history actual pressure is fitteds, dependent variable be P0Experience letter
Number, it is ensured that the norm vacuum of calculating is not less than former vacuum system and sets up vacuum level；
tsFor the saturated-steam temperature corresponding with condenser pressure, DEG C；
Δ t is temperature rise of the cooling water in condenser, DEG C；
tw1For condenser cooling water inflow temperature, DEG C；
DcFor steam turbine condensing amount, to enter condenser quantity of steam sum, kg/s；
DwFor cooling water flow, kg/s；
K is the total heat transfer coefficient of cooling water, using design definite value, kW/ (m2·℃)；
AcFor the film-cooled heat of condenser, using design definite value, m2；
δtFor terminal temperature difference in condenser, DEG C.
Further, in addition to standby vapor extraction device, what the standby vapor extraction device included connecting with the condenser is standby
With extraction line, one-level water circulation vavuum pump, two grades of water circulation vavuum pumps are serially connected with the standby extraction line；The one-level
Reserve steam pipeline between water circulation vavuum pump and condenser is provided with second switch valve, described first switch valve,
Second switch valve is electrically operated valve, operated pneumatic valve or manually-operated gate.
Further, described final stage water circulation vavuum pump, the gas outlet of two grades of water circulation vavuum pumps connect carbonated drink point
From device ground air inlet, described final stage water circulation vavuum pump, the liquid outlet of two grades of water circulation vavuum pumps connect one end of heat exchanger,
The other end connection steam-water separator of heat exchanger；
Further, the overfall of steam-water separator is communicated with waste water reclaiming device, and described moisture trap is using vertical
Formula structure.
Further, the cooling device includes the cooler bin with air inlet and gas outlet, the air inlet with it is described
Turbine condenser is connected, and the gas outlet is connected with vavuum pump；It is also associated with being used for the cooler bin on the cooler bin
The coolant intake pipe of interior input cooling water.
Further, muffler is connected with by connecting line at the gas outlet of the positive-displacement vacuum pump.
Further, temperature sensor is installed on the cooling water inlet of the cooling device.
Compared with prior art, the present invention has advantages below：
1st, the call parameter of collection influence unit condenser vacuum, by calculating and correcting, draws in given circumstance condition
Under the influence of, value should be reached obtained by condenser vacuum, and using norm vacuum as vacuum conditions target, rather than generally adopt at present
Constant speed vavuum pump is used, is at utmost vacuumized under power frequency.
2nd, vacuum pump group capacity selection is carried out according to unit displacement correspondence standard, the vacuum that point counting analysis of using tricks is obtained should reach
Value, converts the displacement pump power input as main pump in control instruction, regulation high-efficiency vacuum pump group, reaches regulation condenser vacuum
To desired value purpose.
3rd, high-efficiency vacuum pump group can be realized continuous to converter unit instruction very well using displacement type vavuum pump as main pump
Response, it is ensured that performance and efficiency are good.Using water ring vacuum pump as fore pump, peak efficiency is maintained with power frequency operation.Vacuum
Pump steam inlet designs cooler, and reduction suction gas temperature simultaneously, improves pump group operating efficiency.
4th, by regulation and control system output order, realize that pump group integral suction flow trim is adjusted, to reach condenser
Vacuum meets start and stop or experimental stage to vacuum special demands to desired value, it is to avoid the unit fortune that operation vacuum boundary is brought
Row security risk.
Described above is only the general introduction of technical solution of the present invention, in order to better understand the technological means of the present invention,
And can be practiced according to the content of specification, below with presently preferred embodiments of the present invention and coordinate accompanying drawing describe in detail as after.
Brief description of the drawings
Fig. 1 is system schematic of the present invention for the efficiently adjustable vacuum-control(led) system of power plant.
Embodiment
With reference to the accompanying drawings and examples, the embodiment to the present invention is described in further detail.Implement below
Example is used to illustrate the present invention, but is not limited to the scope of the present invention.
Embodiment 1
As shown in figure 1, the present embodiment is used for the efficiently adjustable vacuum control method of power plant, including：
The bleeding point that draws gas on condenser is connected to main vapor extraction device, and the main vapor extraction device includes drawing gas by master
The positive-displacement vacuum pump that pipeline is connected with the extraction opening on the condenser, the positive-displacement vacuum pump is serially connected with final stage water circulation
Vavuum pump；The positive-displacement vacuum pump is electrically connected with variable-frequency motor, and the positive-displacement vacuum pump is driven by variable-frequency motor, described
Variable-frequency motor connects controller；The vacuum control method of the condenser, including：
The parameter of collection influence condenser vacuum, the parameter includes：Condenser cooling water inflow temperature tw1, steam turbine coagulate
Vapour amount, into condenser quantity of steam sum Dc, condenser cooling water flow DW；
Value should be reached by calculating real-time condenser vacuum, and value and the real-time vacuum values of current condenser should be reached by comparing condenser vacuum,
Controller should export the control instruction of variable-frequency motor according to condenser vacuum up to value, pass through variable-frequency motor volume adjusted formula vavuum pump
Input, power output, described real-time condenser vacuum should be up to value calculation formula：
ts=Δ t+ δt+tw1
In formula：P0For the norm vacuum tried to achieve, kPa；
PsPressure, kPa are calculated for condenser；
To calculate pressure P by condensersIt is P with the independent variable that history actual pressure is fitteds, dependent variable be P0Experience letter
Number, it is ensured that the norm vacuum of calculating is not less than former vacuum system and sets up vacuum level；
tsFor the saturated-steam temperature corresponding with condenser pressure, DEG C；
Δ t is temperature rise of the cooling water in condenser, DEG C；
tw1For condenser cooling water inflow temperature, DEG C；
DcFor steam turbine condensing amount, to enter condenser quantity of steam sum, kg/s；
DwFor cooling water flow, kg/s；
K is the total heat transfer coefficient of cooling water, using design definite value, kW/ (m2·℃)；
AcFor the film-cooled heat of condenser, using design definite value, m2；
δtFor terminal temperature difference in condenser, DEG C.
In the present embodiment, the adjusting method of variable-frequency motor includes：By the norm vacuum tried to achieve and current unit vacuum values
Compare, both differences deliver to displacement pump variable-frequency motor volume adjusted formula vacuum revolution speed, if machine as variable input instruction
Group current vacuum level then improves positive-displacement vacuum pump rotating speed, if unit current vacuum level less than the norm vacuum calculated
Higher than the norm vacuum of calculating, then positive-displacement vacuum pump rotating speed is reduced, until both are consistent.
In the present embodiment, after unit sets up vacuum, during normal operation and start and stop, by setting up analysis model,
Calculating analysis is acquired to vacuum influence parameter using the existing measuring point of unit, and passes through necessary amendment, real-time condensing is drawn
Device norm vacuum.And regulating command is delivered to by high-efficiency vacuum pump group executing agency by control unit, continuously adjust efficiently true
Empty pump group input-output power, while obtaining should being inputted up to the minimum power of vacuum and vacuum pump group for unit, finally realizes machine
Group whole energy operation., can be by regulation and control system output order, to adjust condenser vacuum to expection during specific demand
Value, realizes the adjustable operation of unit vacuum continuous and stable, it is to avoid the unit operation security risk that operation vacuum boundary is brought.
Embodiment 2
The present embodiment is used for the efficiently adjustable vacuum-control(led) system of power plant, including：On condenser 1, the condenser
The bleeding point that draws gas is connected to main vapor extraction device and standby vapor extraction device, wherein the main vapor extraction device includes drawing gas by master
The positive-displacement vacuum pump 4 that pipeline is connected with the extraction opening on the condenser, the positive-displacement vacuum pump is serially connected with final stage water and followed
Ring vacuum pump 5；Main steam line between the positive-displacement vacuum pump and condenser is provided with first switch valve 2；Institute
State positive-displacement vacuum pump to electrically connect with variable-frequency motor, the positive-displacement vacuum pump is driven by variable-frequency motor 7；On the condenser
Measuring unit 8 is connected with, the measuring unit includes：The temperature sensor of condenser cooling water inflow temperature is measured, into solidifying
The steam pressure sensor of vapour device quantity of steam and the flow sensor for measuring condenser cooling water flow of inlet water；Described temperature
Sensor, steam pressure sensor and flow sensor connect the controller 6 respectively；The variable-frequency motor passes through controller
Control；
The measuring unit, collection condenser cooling water inflow temperature tw1, steam turbine condensing amount, into condenser quantity of steam
Sum Dc, condenser cooling water flow DW；
The controller, value should be reached for calculating real-time condenser vacuum, and comparing condenser vacuum should be up to value and currently solidifying
The real-time vacuum values of vapour device, controller should export the control instruction of variable-frequency motor according to condenser vacuum up to value, pass through variable-frequency motor
The input of volume adjusted formula vavuum pump, power output, wherein described real-time condenser vacuum should be up to value calculation formula：
ts=Δ t+ δt+tw1
In formula：P0For the norm vacuum tried to achieve, kPa；
PsPressure, kPa are calculated for condenser；
To calculate pressure P by condensersIt is P with the independent variable that history actual pressure is fitteds, dependent variable be P0Experience letter
Number, it is ensured that the norm vacuum of calculating is not less than former vacuum system and sets up vacuum level；
tsFor the saturated-steam temperature corresponding with condenser pressure, DEG C；
Δ t is temperature rise of the cooling water in condenser, DEG C；
tw1For condenser cooling water inflow temperature, DEG C；
DcFor steam turbine condensing amount, to enter condenser quantity of steam sum, kg/s；
DwFor cooling water flow, kg/s；
K is the total heat transfer coefficient of cooling water, using design definite value, kW/ (m2·℃)；
AcFor the film-cooled heat of condenser, using design definite value, m2；
δtFor terminal temperature difference in condenser, DEG C.
Embodiment 3
The present embodiment is used for the efficiently adjustable vacuum-control(led) system of power plant, on the basis of embodiment 2, in addition to standby
Vapor extraction device (not shown), the standby vapor extraction device includes the standby extraction line connected with the condenser, described
One-level water circulation vavuum pump, two grades of water circulation vavuum pumps are serially connected with standby extraction line；The one-level water circulation vavuum pump and
Reserve steam pipeline between condenser is provided with second switch valve, and described first switch valve, second switch valve are
Electrically operated valve, operated pneumatic valve or manually-operated gate.
Reserve steam pipeline between the one-level water circulation vavuum pump and condenser is provided with second switch valve, described
First switch valve, second switch valve be electrically operated valve, operated pneumatic valve or manually-operated gate.
Described positive-displacement vacuum pump, final stage water circulation vavuum pump, one-level water circulation vavuum pump, two grades of water circulation vavuum pumps
Arrival end be serially connected with cooling device 3；The advanced described cooling device excessively of medium of condenser output enters back into described appearance
Product formula vavuum pump, final stage water circulation vavuum pump, one-level water circulation vavuum pump, two grades of water circulation vavuum pumps.
The present embodiment is normal in use, main vapor extraction device operation, when main vapor extraction device breaks down, enables standby take out
Vapour device.
Described positive-displacement vacuum pump, final stage water circulation vavuum pump, one-level water circulation vavuum pump, two grades of water circulation vavuum pumps
Arrival end be serially connected with cooling device；The advanced described cooling device excessively of medium of condenser output enters back into described volume
Formula vavuum pump, final stage water circulation vavuum pump, one-level water circulation vavuum pump, two grades of water circulation vavuum pumps.
Further, described final stage water circulation vavuum pump, the gas outlet of two grades of water circulation vavuum pumps connect carbonated drink point
From device ground air inlet, described final stage water circulation vavuum pump, the liquid outlet of two grades of water circulation vavuum pumps connect one end of heat exchanger,
The other end connection steam-water separator of heat exchanger.
The cooling device includes the cooler bin with air inlet and gas outlet, the air inlet and the steam turbine condensing
Device is connected, and the gas outlet is connected with vavuum pump；It is also associated with being used into the cooler bin input cooling on the cooler bin
The coolant intake pipe of water.Temperature sensor is installed on the cooling water inlet of the cooling device.Cooling device reduction suction
Gas temperature simultaneously, improves pump group operating efficiency.
Further, the overfall of steam-water separator is communicated with waste water reclaiming device.The cooling device include have into
Gas port and the cooler bin of gas outlet, the air inlet are connected with the turbine condenser, and the gas outlet is connected with vavuum pump；
The coolant intake pipe for inputting cooling water into the cooler bin is also associated with the cooler bin.The positive displacement vacuum
Muffler is connected with by connecting line at the gas outlet of pump.TEMP is installed on the cooling water inlet of the cooling device
Device.
The present embodiment includes the measuring unit of collection influence condenser vacuum, and vacuum influence parameter is carried out to calculate and defeated
Go out the controller of instruction, the variable-frequency motor of response control instruction, high-efficiency vacuum pump group.By calculating vacuum influence parameter
Analysis, and pass through necessary amendment, show that real-time condenser vacuum should reach value.And regulating command is delivered to by height by control unit
Vacuum pump group executing agency is imitated, high-efficiency vacuum pump group input-output power is adjusted, while obtain unit should reach vacuum and vacuum
The minimum power input of pump group.High-efficiency vacuum pump group includes the water ring vacuum pump as fore pump and the displacement type as main pump
Efficient vacuum pump, and corresponding valve, working solution refrigerated separation device etc., it is cold that displacement pump designs gas with water ring pump front end
But device, is cooled down to improve pump group efficiency to intake-gas.Vacuum pump group capacity is carried out according to unit displacement correspondence standard
Choose, by changing main pump incoming frequency, realize that the regulation of pump group integral suction flow trim reaches adjustment condenser vacuum purpose；
Using necessary numerical computations and modification method, unit is continuously adjusted by high-efficiency vacuum pump group and maintains optimum vacuum to run, most
Realize that unit whole energy is run eventually.
Efficiently adjustable vacuum control method and system of the present invention for power plant, by influence condenser vacuum parameter
Analysis is acquired and calculated, by necessary amendment, show that real-time condenser vacuum should reach value.And will be true by control unit
Null object value is converted into regulating command, and instruction is delivered into high-efficiency vacuum pump group executing agency, adjusts efficient pump group input and output work(
Rate, finally obtain unit should reach the minimal power consumption of vacuum and vacuum pump group.High-efficiency vacuum pump group is included as fore pump
Water ring vacuum pump and the displacement type efficient vacuum pump as main pump, and corresponding valve, working solution refrigerated separation device
It is all provided with counting gas cooler Deng, displacement type vavuum pump and water ring pump intake, intake-gas is cooled down to improve pump group efficiency.
Vacuum pump group capacity selection is carried out according to unit displacement correspondence standard, by changing main pump incoming frequency, realizes that pump group is overall
Steadily regulation reaches adjustment condenser vacuum purpose to suction flow；Using necessary numerical computations and modification method, by efficient
Vacuum pump group continuously adjusts unit and maintains optimum vacuum operation, finally realizes that unit whole energy is run.
The call parameter of unit condenser vacuum is being influenceed by gathering, by calculating and modification method, is being given at set
, should be up to value obtained by condenser vacuum under environmental influence.
Using norm vacuum, by designing certain control parameter, control instruction is converted, is exported to converter unit, regulation
As the displacement pump power input of main pump in high-efficiency vacuum pump group, the power output of final regulation high-efficiency vacuum pump group reaches company
The continuous condenser vacuum value that adjusts is to target value purpose.
High-efficiency vacuum pump group uses displacement type vavuum pump as main pump, can be good at realizing to converter unit instruction continuously
Response, it is ensured that performance and efficiency are good.Using water ring vacuum pump as fore pump, peak efficiency is maintained with power frequency operation.Volume
Vavuum pump simultaneously, improves pump group operating efficiency with designing cooler, reduction suction gas temperature before water ring vacuum pump.
Described above is only the preferred embodiment of the present invention, is not intended to limit the invention, it is noted that for this skill
For the those of ordinary skill in art field, without departing from the technical principles of the invention, can also make it is some improvement and
Modification, these improvement and modification also should be regarded as protection scope of the present invention.
Claims (9)
1. a kind of efficiently adjustable vacuum control method for power plant, it is characterised in that the bleeding point point that draws gas on condenser
Main vapor extraction device is not connected with, and the main vapor extraction device includes connecting with the extraction opening on the condenser by main extraction line
Positive-displacement vacuum pump, the positive-displacement vacuum pump is serially connected with final stage water circulation vavuum pump；The positive-displacement vacuum pump and frequency conversion
Motor is electrically connected, and the positive-displacement vacuum pump is driven by variable-frequency motor, and the variable-frequency motor connects controller；The condenser
Vacuum control method, including：
The parameter of collection influence condenser vacuum, the parameter includes：Condenser cooling water inflow temperature tw1, steam turbine condensing
Amount, into condenser quantity of steam sum Dc, condenser cooling water flow DW；
Value should be reached by calculating real-time condenser vacuum, and value and the real-time vacuum values of current condenser, control should be reached by comparing condenser vacuum
Device should export the control instruction of variable-frequency motor according to condenser vacuum up to value, pass through the defeated of variable-frequency motor volume adjusted formula vavuum pump
Enter, power output, described real-time condenser vacuum should be up to value calculation formula：
<mrow>
<msub>
<mi>P</mi>
<mi>s</mi>
</msub>
<mo>=</mo>
<msup>
<mrow>
<mo>(</mo>
<mfrac>
<mrow>
<msub>
<mi>t</mi>
<mi>s</mi>
</msub>
<mo>+</mo>
<mn>100</mn>
</mrow>
<mn>78.72</mn>
</mfrac>
<mo>)</mo>
</mrow>
<mn>7.46</mn>
</msup>
<mo>&times;</mo>
<mn>0.1</mn>
</mrow>
ts=Δ t+ δt+tw1
<mrow>
<mi>&Delta;</mi>
<mi>t</mi>
<mo>=</mo>
<mfrac>
<mrow>
<mn>525</mn>
<msub>
<mi>D</mi>
<mi>c</mi>
</msub>
</mrow>
<msub>
<mi>D</mi>
<mi>w</mi>
</msub>
</mfrac>
</mrow>
In formula：P0For the norm vacuum tried to achieve, kPa；
PsPressure, kPa are calculated for condenser；
To calculate pressure P by condensersIt is P with the independent variable that history actual pressure is fitteds, dependent variable be P0Empirical function,
Ensure that the norm vacuum calculated is not less than former vacuum system and sets up vacuum level；
tsFor the saturated-steam temperature corresponding with condenser pressure, DEG C；
Δ t is temperature rise of the cooling water in condenser, DEG C；
tw1For condenser cooling water inflow temperature, DEG C；
DcFor steam turbine condensing amount, to enter condenser quantity of steam sum, kg/s；
DwFor cooling water flow, kg/s；
K is the total heat transfer coefficient of cooling water, using design definite value, kW/ (m2·℃)；
AcFor the film-cooled heat of condenser, using design definite value, m2；
δtFor terminal temperature difference in condenser, DEG C.
2. the efficiently adjustable vacuum control method according to claim 1 for power plant, it is characterised in that variable-frequency motor
Adjusting method include：The norm vacuum tried to achieve is compared with current unit vacuum values, both differences refer to as variable input
Order, delivers to displacement pump variable-frequency motor volume adjusted formula vacuum revolution speed, if unit current vacuum level is true less than what is calculated
Sky should then improve positive-displacement vacuum pump rotating speed up to value, if unit current vacuum level is reduced higher than the norm vacuum calculated
Positive-displacement vacuum pump rotating speed, until both are consistent.
3. a kind of efficiently adjustable vacuum-control(led) system for power plant, it is characterised in that including：
The bleeding point that draws gas on condenser, the condenser is connected to main vapor extraction device and standby vapor extraction device, wherein institute
State the positive-displacement vacuum pump that main vapor extraction device includes connecting with the extraction opening on the condenser by main extraction line, the appearance
Product formula vavuum pump is serially connected with final stage water circulation vavuum pump；Set on main steam line between the positive-displacement vacuum pump and condenser
Have provided with first switch valve；The positive-displacement vacuum pump is electrically connected with variable-frequency motor, and the positive-displacement vacuum pump passes through frequency conversion
Motor drives；Measuring unit is connected with the condenser, the measuring unit includes：Measure condenser cooling water inflow temperature
Temperature sensor, into condenser quantity of steam steam pressure sensor and measure condenser cooling water flow of inlet water stream
Quantity sensor；Described temperature sensor, steam pressure sensor and flow sensor connects the controller respectively；It is described
Variable-frequency motor passes through controller control；
The measuring unit, collection condenser cooling water inflow temperature tw1, steam turbine condensing amount, into condenser quantity of steam sum
Dc, condenser cooling water flow DW；
The controller, should reach value, value and current condenser should be reached by comparing condenser vacuum for calculating real-time condenser vacuum
Real-time vacuum values, controller should export the control instruction of variable-frequency motor according to condenser vacuum up to value, be adjusted by variable-frequency motor
The input of positive-displacement vacuum pump, power output, wherein described real-time condenser vacuum should be up to value calculation formula：
<mrow>
<msub>
<mi>P</mi>
<mi>s</mi>
</msub>
<mo>=</mo>
<msup>
<mrow>
<mo>(</mo>
<mfrac>
<mrow>
<msub>
<mi>t</mi>
<mi>s</mi>
</msub>
<mo>+</mo>
<mn>100</mn>
</mrow>
<mn>78.72</mn>
</mfrac>
<mo>)</mo>
</mrow>
<mn>7.46</mn>
</msup>
<mo>&times;</mo>
<mn>0.1</mn>
</mrow>
ts=Δ t+ δt+tw1
<mrow>
<mi>&Delta;</mi>
<mi>t</mi>
<mo>=</mo>
<mfrac>
<mrow>
<mn>525</mn>
<msub>
<mi>D</mi>
<mi>c</mi>
</msub>
</mrow>
<msub>
<mi>D</mi>
<mi>w</mi>
</msub>
</mfrac>
</mrow>
In formula：P0For the norm vacuum tried to achieve, kPa；
PsPressure, kPa are calculated for condenser；
To calculate pressure P by condensersIt is P with the independent variable that history actual pressure is fitteds, dependent variable be P0Empirical function,
Ensure that the norm vacuum calculated is not less than former vacuum system and sets up vacuum level；
tsFor the saturated-steam temperature corresponding with condenser pressure, DEG C；
Δ t is temperature rise of the cooling water in condenser, DEG C；
tw1For condenser cooling water inflow temperature, DEG C；
DcFor steam turbine condensing amount, to enter condenser quantity of steam sum, kg/s；
DwFor cooling water flow, kg/s；
K is the total heat transfer coefficient of cooling water, using design definite value, kW/ (m2·℃)；
AcFor the film-cooled heat of condenser, using design definite value, m2；
δtFor terminal temperature difference in condenser, DEG C.
4. the efficiently adjustable vacuum-control(led) system according to claim 3 for power plant, it is characterised in that also including standby
With vapor extraction device, the standby vapor extraction device includes the standby extraction line connected with the condenser, the standby extraction steam pipe
One-level water circulation vavuum pump, two grades of water circulation vavuum pumps are serially connected with road；Between the one-level water circulation vavuum pump and condenser
Reserve steam pipeline be provided with second switch valve, described first switch valve, second switch valve are electrically operated valve, gas
Movable valve or manually-operated gate.
5. the efficiently adjustable vacuum-control(led) system according to claim 4 for power plant, it is characterised in that described end
Level water circulation vavuum pump, the gas outlet of two grades of water circulation vavuum pumps with connecting steam-water separator air inlet, described final stage water
Circulation vacuum pump, the liquid outlet of two grades of water circulation vavuum pumps connect one end of heat exchanger, the other end connection carbonated drink point of heat exchanger
From device；
6. the efficiently adjustable vacuum-control(led) system according to claim 5 for power plant, it is characterised in that steam-water separation
The overfall of device is communicated with waste water reclaiming device, and described moisture trap uses vertical structure.
7. the efficiently adjustable vacuum-control(led) system according to claim 6 for power plant, it is characterised in that the cooling
Device includes the cooler bin with air inlet and gas outlet, and the air inlet is connected with the turbine condenser, the outlet
Mouth is connected with vavuum pump；The cooling water input for inputting cooling water into the cooler bin is also associated with the cooler bin
Pipe.
8. the efficiently adjustable vacuum-control(led) system according to claim 7 for power plant, it is characterised in that the volume
Muffler is connected with by connecting line at the gas outlet of formula vavuum pump.
9. the efficiently adjustable vacuum-control(led) system according to claim 8 for power plant, it is characterised in that the cooling
Temperature sensor is installed on the cooling water inlet of device.
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