CN105652663B - A method of the sliding pressure curve depth optimization differentiated based on loading zone - Google Patents
A method of the sliding pressure curve depth optimization differentiated based on loading zone Download PDFInfo
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Abstract
The invention discloses a kind of methods of the sliding pressure curve depth optimization differentiated based on loading zone, and steam turbine obtains the sliding pressure curve under a certain back pressure by pitch with vapour Optimum Experiment, and then obtains the operation relationship under a certain back pressure between the power of the assembling unit and main steam pressure；Wherein, the method of the depth optimization is, when the unit back pressuce changes, the power of the assembling unit after economy is adapted to by the corresponding power of known sliding pressure curvilinear motion unit back pressuce by back pressure amendment, to obtain the optimal main steam pressure under variation backpressure condition.When the present invention is to be adapted to known sliding pressure curve on the basis of the corresponding power of unit back pressuce, corresponding known sliding pressure curve is adjusted main vapour pressure：How no matter unit back pressuce change in this way, can have the sliding pressure curve of an optimization, substantially increase the economy of unit, the method is simple and practicable.
Description
Technical field
The present invention relates to a kind of methods of the sliding pressure curve depth optimization differentiated based on loading zone.
Background technology
With deepening constantly for China's reform and opening-up, China's economic development achieves remarkable effect, especially thermal power generation
Factory has played significant role in terms of meeting Electricity Demand, but energy consumption and problem of environmental pollution still do not obtain very
Good solution.Energy-saving and emission-reduction at present are the fundamental state policies in China, and power plant is also that pressure is huge in terms of energy-saving and emission-reduction.
The main steam pressure control system of the prior art is to obtain the corresponding pressure setting of current loads according to sliding pressure curve
Value is introduced into progress closed loop adjusting in boiler master controller.It is increasing however as installed capacity, the rate of load condensate of current each power plant
It is only about 70%, some big units are also required to participate in peak regulation, and energy saving situation is more acute；Therefore, one it is efficient, energy saving, steady
The problem of fixed sliding pressure curve is exactly power plant urgent need to resolve.Many power plant are all to the sliding pressure curve in the case of peak load regulation at present
Be optimized, but optimization of sliding pressure experiment be to be carried out under the conditions of certain turbine back pressure, when external environment change, such as the winter,
In two season of summer, back pressure of condenser difference is up to 5kPa or more, and under same load, main steam flow difference is apparent, optimal main vapour pressure
With regard to difference, therefore, how to adjust and maintain main steam pressure parameter stability, it is right to allow all other parameters of unit to stablize therewith
Improving unit operation stability and economy has important meaning.
Invention content
The purpose of the present invention is to propose to a kind of methods of the sliding pressure curve depth optimization differentiated based on loading zone, are to solve fire
The problem of optimization of sliding pressure curve of power plant does not adapt to economy, on the basis of steam turbine optimization of sliding pressure curve, invention is a kind of
When for space-variant surely, steam turbine sliding pressure curve adjustment mode.
To achieve the goals above, the technical scheme is that：A kind of sliding pressure curve depth differentiated based on loading zone
The method of optimization, steam turbine obtains the sliding pressure curve under a back pressure by pitch with vapour Optimum Experiment, and then obtains this back pressure
Lower operation relationship between the power of the assembling unit and main steam pressure；Wherein, the method for the depth optimization is, when the unit back pressuce
When variation, the power of the assembling unit after economy is adapted to by the corresponding work(of the sliding pressure curve unit back pressuce by back pressure amendment
Rate, to obtain the main steam pressure of depth optimization under variation backpressure condition.
Scheme is further：It is described that the power of the assembling unit after economy is adapted to by known sliding pressure curve by back pressure amendment
The corresponding power process of unit back pressuce is：
The first step：By pitch the sliding pressure curve in the case where testing back pressure is obtained with vapour Optimum Experiment；
Second step：Obtain the fair curve of unit back pressuce and the power of the assembling unit；
Third walks：According to the fair curve of back pressure and the power of the assembling unit, the power of the assembling unit after economy is adapted to and institute
State the corresponding power of sliding pressure curve unit back pressuce；
Wherein：Known sliding pressure curve is that the sliding pressure that steam turbine is matched by pitch under the back pressure that vapour Optimum Experiment obtains is bent
Line.
Scheme is further：The unit back pressuce and the fair curve of the power of the assembling unit are provided by steam turbine producer.
Scheme is further：The amendment power of the assembling unit is by formula Pe "=Pe'/[1+ (y1-y2)] obtain, wherein：
Pe' is the power of the assembling unit after economy, when Pe " is that the power of the assembling unit is adapted to known sliding pressure curve and corresponds to back pressure after economy
The power of the assembling unit, y1For the corresponding correction factor of back pressure after variation, y2The correction factor under back pressure is corresponded to for known sliding pressure curve,
Wherein, the correction factor y1With the correction factor y2It is to be obtained from fair curve.
When the present invention is to be adapted to known sliding pressure curve on the basis of the corresponding power of unit back pressuce, corresponding known sliding pressure curve
Main vapour pressure is adjusted：How no matter unit back pressuce change in this way, can have the sliding pressure curve of an optimization, significantly
The economy of unit is improved, the method is simple and practicable.
Invention is described in detail with reference to the accompanying drawings and examples.
Description of the drawings
Fig. 1 is the implementing procedure figure of the method for the present invention；
Power and pressure curve optimal Fig. 2；
The fair curve of Fig. 3 back pressures and power.
Specific implementation mode
A method of it is adjusted as the Steam Turbine of steam-electric power based on the sliding pressure curve depth optimization that loading zone differentiates
Door with vapour Optimum Experiment obtains the sliding pressure curve under a back pressure, so obtain under this back pressure the power of the assembling unit and main steam pressure it
Between operation relationship；, main steam pressure is then regulated and controled according to this relationship, however as stated in the background art：Obtain sliding pressure curve
Optimization of sliding pressure experiment be to be carried out under the conditions of certain turbine back pressure, when external environment changes, such as winter, Xia Liangji, condensing
Device back pressure difference is up to 5kPa or more, and under same load, main steam flow difference is apparent, and optimal main vapour pressure is also just different, this
Sliding pressure curve is not just optimal sliding pressure curve, in order to maintain main steam pressure parameter stability, to allow unit all other
Parameter is stablized therewith, needs the optimization for carrying out depth, and then have important meaning to improving unit operation stability and economy.
Therefore, the method for depth optimization described in the present embodiment is, when the unit back pressuce changes, to be become machine back pressure by back pressure amendment
The power of the assembling unit after change is adapted to the corresponding power of the sliding pressure curve unit back pressuce, to obtain depth under variation backpressure condition
The main steam pressure of optimization.
In embodiment：It is described that the power of the assembling unit after economy is adapted to by known sliding pressure curve unit by back pressure amendment
The corresponding power process of back pressure is：
The first step：By pitch the sliding pressure curve in the case where testing back pressure is obtained with vapour；I.e.：It is excellent with vapour by traditional pitch
Change experimental method and obtains the sliding pressure curve in the case where testing back pressure.As shown in Fig. 2, being exactly after certain power plant is optimized by pitch with vapour
Obtained sliding pressure curve is a known sliding pressure curve.Relationship between power of the assembling unit Pe and main steam pressure is：Work as Pe0<
Pe<Pe1When, unit sliding pressure operation；Work as Pe1<Pe<Pe2When, unit fixed pressure operation；Work as Pe2<Pe<Pe3When, unit sliding pressure operation；
Work as Pe3<Pe<Pe4When, unit fixed pressure operation.According to the sliding pressure curve, there are one corresponding masters for each corresponding power
Steam pressure adjusts main steam pressure according to this sliding pressure curve, can greatly improve the economy of unit.But this sliding pressure is bent
Line is only limited to a certain fixed back pressure pc.
Second step：Obtain the fair curve of unit back pressuce and the power of the assembling unit；The fair curve of back pressure and power is all by vapour
Turbine producer provides, as shown in figure 3, the figure is exactly the fair curve of typical back pressure and power.
Third walks：According to the fair curve of back pressure and the power of the assembling unit, the power of the assembling unit after economy is adapted to and institute
State the corresponding power of sliding pressure curve unit back pressuce.
According to fig. 3, the amendment power of the assembling unit can pass through formula Pe "=Pe'/[1+ (y1-y2)] obtain, wherein：Pe'
For the power of the assembling unit after economy, Pe " is that the power of the assembling unit is adapted to when known sliding pressure curve corresponds to back pressure after economy
The power of the assembling unit, y1For the corresponding correction factor of back pressure after variation, y2The correction factor under back pressure is corresponded to for known sliding pressure curve,
In, the correction factor y1With the correction factor y2It is to be obtained from fair curve.
When being adapted to known sliding pressure curve on the basis of the corresponding power of unit back pressuce, corresponding known sliding pressure curve is to main vapour
Pressure is adjusted：I.e. on the basis of revised power of the assembling unit Pe ", the corresponding power area on known optimal sliding pressure curve
Between carry out pressure adjustment：Work as Pe0<Pe”<Pe1When, corresponding Pe0-Pe1Section curve into
Row sliding pressure operation；Work as Pe1<Pe”<Pe2When, corresponding Pe1-Pe2Section curve carries out fixed pressure operation；When
Pe2<Pe”<Pe3When, corresponding Pe2-Pe3Section curve carries out sliding pressure operation；
Work as Pe3<When Pe ", corresponding Pe3-Pe4Section curve carries out fixed pressure operation.
In embodiment：The pitch with vapour optimization method be in 50%~100% load range, averagely select 8~
10 load points arrange 4~5 different high pitch open positions including former valve sequence, carry out in each load point
Thermal loss of steam turbine rate is tested, and finally according to each operating condition of test heat consumption rate test result, selects the pitch valve position of heat consumption rate minimum,
Match vapour optimal valve position as after new optimization.The sliding pressure curve in the case where testing back pressure is obtained on this basis.
Fig. 1 is the implementing procedure figure of this method：
1. obtaining the sliding pressure curve under a certain back pressure with vapour optimization method by traditional pitch.As shown in Figure 2.This sliding pressure
Curve is only limited to a certain fixed back pressure pc.
2. obtaining the fair curve of unit back pressuce and power.The fair curve of back pressure and power is carried by steam turbine producer
For；As shown in Figure 3.
3. by back pressure to the fair curve of power, by the power correction after economy to the unit for having sliding pressure curve
The corresponding power of back pressure.
4. when being adapted to known sliding pressure curve on the basis of the corresponding power of unit back pressuce, corresponding known sliding pressure curve is to master
Steam pressure is adjusted：I.e. on the basis of revised power of the assembling unit Pe ", the corresponding power on known optimal sliding pressure curve
Section carries out pressure adjustment.
How no matter unit back pressuce change in this way, can have the sliding pressure curve of an optimization, substantially increase unit
Economy.
Claims (2)
1. a kind of method of the sliding pressure curve depth optimization differentiated based on loading zone, steam turbine are obtained by pitch with vapour Optimum Experiment
Sliding pressure curve under to a back pressure, and then obtain the operation relationship under this back pressure between the power of the assembling unit and main steam pressure；Its
It is characterized in that, the method for the depth optimization is, will be after economy by back pressure amendment when the unit back pressuce changes
The power of the assembling unit is adapted to the corresponding power of the sliding pressure curve unit back pressuce, to obtain depth optimization under variation backpressure condition
Main steam pressure；
It is described that the power of the assembling unit after economy is adapted to by the corresponding work(of known sliding pressure curve unit back pressuce by back pressure amendment
Rate process is：
The first step：By pitch the sliding pressure curve in the case where testing back pressure is obtained with vapour Optimum Experiment；
Second step：Obtain the fair curve of unit back pressuce and the power of the assembling unit；
Third walks：According to the fair curve of back pressure and the power of the assembling unit, the power of the assembling unit after economy is adapted to and the cunning
It buckles the corresponding power of line unit back pressuce；
Wherein：Sliding pressure curve under the back pressure that known sliding pressure curve, which is steam turbine, to be obtained with vapour Optimum Experiment by pitch；
The amendment power of the assembling unit is by formula Pe "=Pe'/[1+ (y1-y2)] obtain, wherein：Pe' is after economy
The power of the assembling unit, Pe " are adapted to power of the assembling unit when known sliding pressure curve corresponds to back pressure, y for the power of the assembling unit after economy1To become
The corresponding correction factor of back pressure, y after change2The correction factor under back pressure is corresponded to for known sliding pressure curve, wherein the correction factor
y1With the correction factor y2It is to be obtained from fair curve.
2. the method for depth optimization according to claim 1, which is characterized in that the unit back pressuce and the power of the assembling unit are repaiied
Positive curve is provided by steam turbine producer.
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106401660B (en) * | 2016-11-25 | 2018-02-13 | 国网河南省电力公司电力科学研究院 | A kind of steam turbine optimization of sliding pressure control method based on hypersurface |
| CN107218086B (en) * | 2017-07-28 | 2019-04-02 | 华能平凉发电有限责任公司 | Steam turbine and its sliding pressure curve correcting method and system based on load capacity |
| CN107654264B (en) * | 2017-09-20 | 2020-04-17 | 徐州华润电力有限公司 | Sliding pressure curve obtaining method and system and pressure adjusting method and system |
| CN107587902B (en) * | 2017-09-21 | 2019-10-29 | 国网江西省电力公司电力科学研究院 | A kind of real-time back pressure modification method of Steam Turbine variable-pressure operation |
| CN110262281A (en) * | 2019-05-07 | 2019-09-20 | 东南大学 | Unit sliding pressure operation control method and system |
| CN111045321B (en) * | 2019-06-26 | 2021-05-11 | 控软自动化技术（北京）有限公司 | Method for coordinately controlling embedded internal model controller under deep peak regulation |
| CN112685969A (en) * | 2020-12-24 | 2021-04-20 | 润电能源科学技术有限公司 | Optimization method for cold end of large-scale thermal power plant |
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