CN108930565A - A kind of Steam Turbine peak regulation optimization method and system - Google Patents
A kind of Steam Turbine peak regulation optimization method and system Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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Abstract
The invention discloses a kind of Steam Turbine peak regulation optimization method and systems.This method comprises: determining the relation curve between optimal main steam pressure and load under conditions of exhaust steam pressure is certain, it is denoted as the first relation curve, optimal main steam pressure is the smallest main steam pressure of heat consumption；Change exhaust steam pressure and maintain the exhaust steam pressure after changing constant, determines the relation curve between optimal main steam pressure and load, be denoted as the second relation curve；According to the first relation curve and the second relation curve, influence coefficient of the exhaust steam pressure to optimal main steam pressure is determined；According to the first relation curve and the second relation curve and coefficient is influenced, is determined under different exhaust steam pressures, the relation curve between optimal main steam pressure and load obtains relation curve cluster；The sliding pressure of Steam Turbine is adjusted according to relation curve cluster.Steam Turbine peak regulation optimization method provided by the invention and system keep the heat consumption of Steam Turbine minimum, improve the economy of Steam Turbine peak regulation.
Description
Technical field
The present invention relates to field of thermal power, more particularly to a kind of Steam Turbine peak regulation optimization method and system.
Background technique
With the high speed development of national electric power, when power industry has taken leave of " electricity shortage " and enters " power surplus "
In generation, depth peaking operation has become new normality when a large amount of thermal motor group leaders, and the economy of fired power generating unit peaking operation looks forward to power generation
The importance of industry cost efficiency becomes increasingly conspicuous." sliding parameter operation " is obtained as a kind of effective steam turbine peaking operation technology
Research and utilization extensively.Majority electricity power enterprise instructs unit tune according to the sliding pressure operation curve of turbine making factory offer at present
Peak operation initial conditions adjustment, due to manufactory provide sliding pressure operation curve be homotype unit design conditions (design back-pressure,
Heater and small turbine operate in design conditions) under master curve, and the actual state deviation of each unit is larger, directly
It is obviously outdated to indiscriminately imitate.
In response to this problem, it mostly uses at present and thermal performance test is carried out to unit, seek to meet each unit actual conditions
Main steam sliding pressure operation curve.However the online thermal performance test of high-precision is carried out to unit, tight to operating system insulation request,
Sampling parameter required precision is high, test period is long, heavy workload, and can only test several typical operating conditions, gained
The main steam sliding pressure operation curve representativeness arrived is limited.Moreover, conventional sliding pressure operation technology regards main steam pressure as unit load
Monotropic function it is unrelated with unit exhaust steam pressure.And actually main steam pressure and steam turbine exhaust pressure has very between the two
Strong coupling, the two influence each other, and exhaust steam pressure difference sliding pressure operation curve is just different, the sliding pressure operation curve of a unit
Should be cluster rather than only one.Currently, influence of the exhaust steam pressure to main steam pressure mostly uses linearization process, each exhaust steam pressure
The corresponding sliding pressure slope of curve is identical, is parallel to each other.And in fact, the sliding pressure slope of curve under each exhaust steam pressure is not identical,
Non-parallel relation between curve seeks the method for different exhaust steam pressure sliding pressure curves using the method for translation test sliding pressure curve
There are large errors.
Summary of the invention
The object of the present invention is to provide a kind of Steam Turbine peak regulation optimization method and systems, make the heat consumption of Steam Turbine most
It is small, improve the economy of Steam Turbine peak regulation.
To achieve the above object, the present invention provides following schemes:
A kind of Steam Turbine peak regulation optimization method, which comprises
Under conditions of exhaust steam pressure is certain, the relation curve between optimal main steam pressure and load is determined, be denoted as
One relation curve, the optimal main steam pressure are the smallest main steam pressure of the corresponding heat consumption of the load；
Change exhaust steam pressure and maintain the exhaust steam pressure after changing constant, determines between optimal main steam pressure and load
Relation curve is denoted as the second relation curve；
According to first relation curve and second relation curve, determine exhaust steam pressure to optimal main steam pressure
Influence coefficient；
According to first relation curve and the second relation curve and the influence coefficient, determine in different exhaust steam pressures
Under, the relation curve between optimal main steam pressure and load obtains relation curve cluster；
The sliding pressure of Steam Turbine is adjusted according to the relation curve cluster.
Optionally, the relation curve between the optimal main steam pressure of the determination and load, specifically includes:
It maintains exhaust steam pressure constant, determines optimal main steam pressure corresponding to multiple assumed loads；
To point and sliding pressure operation starting point determined by the assumed load and its corresponding optimal main steam pressure
Linear fit is carried out with terminating point, obtains the relation curve between optimal main steam pressure and load.
Optionally, the maintenance exhaust steam pressure is constant, determines optimal main steam pressure corresponding to multiple assumed loads, tool
Body includes:
Obtain the main steam pressure of Steam Turbine；
It maintains exhaust steam pressure and assumed load constant, centered on the main steam pressure, is adjusted in setting pressure limit
The whole main steam pressure；
The Steam Turbine is calculated in the exhaust steam pressure, assumed load and main steam pressure tubine adjusted
The heat consumption of group；
With the minimum target of heat consumption, feedback regulation is carried out to the main steam pressure in setting pressure limit, until
To the smallest heat consumption；
It determines corresponding main steam pressure when the heat consumption minimum, is denoted as optimal main steam pressure.
Optionally, described according to first relation curve and second relation curve, determine exhaust steam pressure to optimal
The influence coefficient of main steam pressure, specifically includes:
According to kc=Δ Po/ΔPcCalculate influence coefficient of the exhaust steam pressure to optimal main steam pressure, wherein kcTo influence
Coefficient, Δ PoFor same load the corresponding main steam pressure of first relation curve in the corresponding master of the second relation curve
The difference of steam pressure, Δ PcFor the corresponding exhaust steam pressure of the first relation curve and the corresponding exhaust steam pressure of the second relation curve it
Difference.
Optionally, described that the sliding pressure of Steam Turbine is adjusted according to the relation curve cluster, it specifically includes:
Obtain the exhaust steam pressure and load at Steam Turbine scene；
Optimal main steam pressure corresponding to the exhaust steam pressure and load for determining scene according to the relation curve cluster；
Obtain the pressure value of sliding pressure module output；
Determine the difference of the pressure value of main steam pressure and the output of sliding pressure module；
The sliding pressure module is adjusted according to difference.
The present invention also provides a kind of Steam Turbine peak regulation optimization system, the system comprises:
First relation curve determining module, under conditions of exhaust steam pressure is certain, determine optimal main steam pressure with
Relation curve between load, is denoted as the first relation curve, the optimal main steam pressure be the corresponding heat consumption of the load most
Small main steam pressure；
Second relation curve determining module for changing exhaust steam pressure and maintains the exhaust steam pressure after changing constant, determines
Relation curve between optimal main steam pressure and load is denoted as the second relation curve；
Coefficient determination module is influenced, for determining steam discharge according to first relation curve and second relation curve
Influence coefficient of the pressure to optimal main steam pressure；
Relation curve cluster determining module, for according to first relation curve and the second relation curve and the influence
Coefficient, determines under different exhaust steam pressures, and the relation curve between optimal main steam pressure and load obtains relation curve cluster；
Adjustment module, for the sliding pressure of Steam Turbine to be adjusted according to the relation curve cluster.
Optionally,
The first relation curve determining module and the second relation curve determining module include:
Optimal main steam pressure determination unit determines corresponding to multiple assumed loads for maintaining exhaust steam pressure constant
Optimal main steam pressure；
Linear fit unit, for determined by the assumed load and its corresponding optimal main steam pressure point with
And sliding pressure operation starting point and ending point carries out linear fit, obtains the relation curve between optimal main steam pressure and load.
Optionally, the optimal main steam pressure determination unit, specifically includes:
Main steam pressure obtains subelement, for obtaining the main steam pressure of Steam Turbine；
Main steam pressure adjusts subelement, for maintaining exhaust steam pressure and assumed load constant, with the main steam pressure
Centered on, the main steam pressure is adjusted in setting pressure limit；
Calculation of heat rate subelement, for calculating the Steam Turbine after the exhaust steam pressure, assumed load and adjustment
Main steam pressure tubine group heat consumption；
Minimum heat consumption determines subelement, for setting in pressure limit to the main steam with the minimum target of heat consumption
Pressure carries out feedback regulation, until obtaining the smallest heat consumption；
Optimal main steam pressure determines subelement, and corresponding main steam pressure, is denoted as when for determining the heat consumption minimum
Optimal main steam pressure.
Optionally, the influence coefficient determination module, specifically includes:
Factor determination unit is influenced, for according to kc=Δ Po/ΔPcExhaust steam pressure is calculated to the shadow of optimal main steam pressure
Ring coefficient, wherein kcTo influence coefficient, Δ PoFor same load the corresponding main steam pressure of first relation curve and
The difference of the corresponding main steam pressure of second relation curve, Δ PcIt is bent for the corresponding exhaust steam pressure of the first relation curve and the second relationship
The difference of the corresponding exhaust steam pressure of line.
Optionally, the adjustment module, specifically includes:
On-site parameters acquiring unit, for obtaining the exhaust steam pressure and load at Steam Turbine scene；
The optimal main steam pressure determination unit in scene, for determined according to the relation curve cluster scene exhaust steam pressure and
Optimal main steam pressure corresponding to load；
Sliding pressure exports acquiring unit, for obtaining the pressure value of sliding pressure module output；
Pressure difference determination unit, the difference of the pressure value for determining main steam pressure and the output of sliding pressure module；
Sliding pressure adjusts unit, for being adjusted according to difference to the sliding pressure module.
The specific embodiment provided according to the present invention, the invention discloses following technical effects: steamer provided by the invention
Peak load regulation optimization method and system, it is contemplated that influence of the Turbine Cold Junction exhaust steam pressure to hot end main steam pressure, and according to
It influences to have carried out sliding pressure operation curve processed variable coefficient processing, draws sliding pressure operation set of curves, realize unit in any steam discharge
Under pressure peak load regulation performance driving economy can be greatly improved by the optimal main steam pressure of sliding pressure operation Curve selection.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without any creative labor, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is Steam Turbine of embodiment of the present invention peak regulation optimization method flow chart；
Fig. 2 is that Steam Turbine runs heat consumption and main steam pressure relational graph；
Fig. 3 is the sliding pressure operation curve graph under the single test exhaust steam pressure of the embodiment of the present invention；
Fig. 4 is the sliding pressure operation curve graph of the multiple rows of steam pressure of the embodiment of the present invention；
Fig. 5 is Steam Turbine of embodiment of the present invention peak regulation optimization system structure chart.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The object of the present invention is to provide a kind of Steam Turbine peak regulation optimization method and systems, make the heat consumption of Steam Turbine most
It is small, improve the economy of Steam Turbine peak regulation.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
When steam turbine peaking operation, the method for operation of servo valve and the parameter selection of main steam have unit economy
Directly, significant impact, and measure which kind of servo valve method of operation arrange in pairs or groups how many main steam conditions be it is best, according to unit
The height of operation heat consumption is judged undoubtedly most intuitive, reliable.Machine is obtained according to the mode of conventional thermodynamic performance test
Group operation heat consumption needs replacing a large amount of high-acruracy survey elements, cloth amplification quantity cable, a large amount of data unit operations of acquisition, investment
Human and material resources it is numerous, and test result, poor in timeliness cannot be obtained in real time.This technology calculates unit using "black box" technology
Heat consumption is run, complicated heat regenerative system thermodynamic computing is got around, seeks unit operation heat consumption with indirect calculating, it may be assumed that unit operation heat
Consumption=enter steam turbine heat/generated output power.Since the parameter needed for calculating can be by Distributed Control System (DCS)
It obtains, unit operation operation heat consumption can be acquired in real time, test period can be greatly shortened, examination can be increased more within the identical test period
Operating point quantity is tested, this has very positive meaning to the unit operation minimum operating point of heat consumption is accurately sought.
Fig. 1 Steam Turbine peak regulation optimization method flow chart of the embodiment of the present invention, as shown in Figure 1, steamer provided by the invention
Peak load regulation optimization method flow chart step is as follows:
Step 101: under conditions of exhaust steam pressure is certain, determining that the relationship between optimal main steam pressure and load is bent
Line, is denoted as the first relation curve, and the optimal main steam pressure is the smallest main steam pressure of the corresponding heat consumption of the load；
Step 102: changing exhaust steam pressure and maintain the exhaust steam pressure after changing constant, determine optimal main steam pressure and bear
Relation curve between lotus is denoted as the second relation curve；Change water circulating pump operation number of units to change exhaust steam pressure；
Step 103: according to first relation curve and second relation curve, determining exhaust steam pressure to optimal main steaming
The influence coefficient of steam pressure；
Step 104: according to first relation curve and the second relation curve and the influence coefficient, determining in difference
Under exhaust steam pressure, relation curve between optimal main steam pressure and load obtains relation curve cluster；
Step 105: the sliding pressure of Steam Turbine being adjusted according to the relation curve cluster.
Wherein, the relation curve between the optimal main steam pressure of the determination and load, specifically includes:
It maintains exhaust steam pressure constant, determines optimal main steam pressure corresponding to multiple assumed loads；
To point and sliding pressure operation starting point determined by the assumed load and its corresponding optimal main steam pressure
Linear fit is carried out with terminating point, obtains the relation curve between optimal main steam pressure and load.
The maintenance exhaust steam pressure is constant, determines optimal main steam pressure corresponding to multiple assumed loads, specifically includes:
Obtain the main steam pressure of Steam Turbine；
It maintains exhaust steam pressure and assumed load constant, centered on the main steam pressure, is adjusted in setting pressure limit
The whole main steam pressure；Pressure is set as main steam pressure upper and lower 2 to 3MPa, multiple loads are 10% rated load of difference
Multiple load values；
The Steam Turbine is calculated in the exhaust steam pressure, assumed load and main steam pressure tubine adjusted
The heat consumption of group；
With the minimum target of heat consumption, feedback regulation is carried out to the main steam pressure in setting pressure limit, until
To the smallest heat consumption；
It determines corresponding main steam pressure when the heat consumption minimum, is denoted as optimal main steam pressure.
Relationship between heat consumption and main steam pressure is as shown in Figure 1, the calculation method of heat consumption is as follows:
The first step calculates steam turbine main steam flow
Main steam flow D0It is calculated using Fu Liugeer formula:
D01--- base operation condition main steam flow D0--- operating condition of test main steam flow
P01--- base operation condition first stage pressure P0--- operating condition of test first stage pressure
T01--- base operation condition governing stage temperature T0--- operating condition of test governing stage temperature
Base operation condition data D01、P01、T01It reports and chooses from target unit performance test；
Second step calculates reheated steam flow
Dhr1--- base operation condition reheated steam flow Dhr--- operating condition of test reheated steam flow
Phr1--- base operation condition reheated steam pressure Phr--- operating condition of test reheated steam pressure
Thr1--- base operation condition reheat steam temperature Thr--- operating condition of test reheat steam temperature
Base operation condition data Dhr1、Phr1、Thr1It reports and chooses from target unit performance test；
Third step calculates cold steam flow again
Problem appear to is that reheat steam temperature is lower than superheat steam temperature when due to peak load regulation operation, so practical fortune
Row unit reheater attemperation water flow is zero, i.e. Drhs=0, then:
Dcr=Dhr
4th step calculates feedwater flow
(1) when desuperheating water of superheater is fetched water from Gao Jiaqian:
Dfw=D0-Dshs
Dfw--- feedwater flow Dshs--- desuperheating water of superheater flow
(2) when fetching water after desuperheating water of superheater adds from height:
Dfw=D0
Desuperheating water of superheater flow takes the measured value on unit DCS picture.
5th step, steam turbine net heat input calculate
Qjr=D0h0+Dhrhhr-Dfwhfw-Dcrhcr-Dshshshs-Drhshrhs
D0--- main steam flow h0--- main steam enthalpy
Dhr--- reheated steam flow hhr--- reheat heat steam enthalpy
Dfw--- feedwater flow hfw--- water supply enthalpy
Dcr--- cold steam flow h againcr--- cold steam enthalpy again
Dshs--- desuperheating water of superheater flow hshs--- desuperheating water of superheater enthalpy
Drhs--- reheater attemperation water flow hrhs--- reheater desuperheating water enthalpy
Corresponding working medium enthalpy is calculated by general enthalpy software by its corresponding pressure on DCS and temperature and is obtained.
5th step calculates unit and runs heat consumption:
Hr=Qjr/Ne
Hr--- unit runs heat consumption Ne--- generator power
Qjr--- steam turbine net heat input
The operation heat consumption and history of forming trend under main steam pressure are calculated, it is since DCS sample frequency is 1Hz, i.e., per second
Clock can be completed once to run calculation of heat rate and generate a trend point, available thousands of trend points after the completion of transformation,
Middle minimum point is to run the heat consumption figure of merit.Its correspond to main vapour pressure be under the specific back pressure load correspond to optimal main vapour pressure
Power.According to test result, the optimal main steam pressure for testing the identical test load point of exhaust steam pressure is subjected to linear fit, knot
Main steam pressure sliding pressure starting point and ending point is closed, draws the sliding pressure operation curve under test exhaust steam pressure, as shown in Figure 2.
Step 103 specifically includes:
According to kc=Δ Po/ΔPcCalculate influence coefficient of the exhaust steam pressure to optimal main steam pressure, wherein kcTo influence
Coefficient, Δ PoFor same load the corresponding main steam pressure of first relation curve in the corresponding master of the second relation curve
The difference of steam pressure, Δ PcFor the corresponding exhaust steam pressure of the first relation curve and the corresponding exhaust steam pressure of the second relation curve it
Difference.
First relation curve and the second relation curve are the relation curve that test obtains, and are denoted as test relation curve, non-examination
It tests relation curve and corrects to obtain according to coefficient is influenced by test relation curve.Test relation curve can have two, can also have
A plurality of, table one is the value of obtained optimal main steam pressure under different exhaust steam pressures, different load.
ΔPO=Pzy2-Pzy1(or Pzy3-Pzy2、Pzy4-Pzy3、Pzy5-Pzy4)
ΔPc=Pc2-Pc1(or Pc3-Pc2、Pc4-Pc3、Pc5-Pc4)
The influence coefficient k under exhaust steam pressure, test load must be testedc
The average value for the influence coefficient being calculated by test relation curve can be taken as final influence coefficient kc。
Non-test exhaust steam pressure is calculated in test load point (such as 60%THA, 70%THA, 80%THA) with influence coefficient
Optimal main steam pressure after, each optimum pressure carry out linear fit, obtain the sliding pressure operation curve of non-test exhaust steam pressure,
As shown in Figure 3.
Wherein, the calculation method of the optimal main steam pressure under non-test exhaust steam pressure is as follows, according to formula kc=Δ Po/
ΔPc, main steam pressure variation delta Po=kc×ΔPc, optimal main steam pressure P under non-test exhaust steam pressureo=Pyz+Δ
Po。
Step 105 specifically includes:
Obtain the exhaust steam pressure and load at Steam Turbine scene；
Optimal main steam pressure corresponding to the exhaust steam pressure and load for determining scene according to the relation curve cluster；
Obtain the pressure value of sliding pressure module output；
Determine the difference of the pressure value of main steam pressure and the output of sliding pressure module；
The sliding pressure module is adjusted according to difference.
Since Steam Turbine DCS sliding pressure module is linear block, but it allows to carry out artificial biasing to its target value to set
Artificially change main vapour pressure when realizing actual motion.And optimization of sliding pressure be substantially specific back pressure under unit real-time operating condition,
The determination of optimal main vapour pressure under specific load, as a result, a three-dimensional chart, therefore can not directly use, this technology uses
The host only individually communicated with DCS complete after optimal main vapour pressure determines under real-time running state with original machine group DCS sliding pressure module
Deviation is generated after output valve, this deviation is returned in DCS sliding pressure target value as real-time bias and is exported again, thus
Realize real-time dynamic sliding pressure control without carrying out any change to former DCS sliding pressure module.
Steam Turbine peak regulation optimization method provided by the invention, it is contemplated that Turbine Cold Junction exhaust steam pressure is to hot end main steam
The influence of pressure, and variable coefficient processing has been carried out to sliding pressure operation curve processed according to influence, sliding pressure operation set of curves is drawn, is realized
Unit under any exhaust steam pressure can greatly improve peak load regulation by the optimal main steam pressure of sliding pressure operation Curve selection
Performance driving economy.
The present invention also provides a kind of Steam Turbine peak regulation optimization system, Fig. 5 is Steam Turbine of embodiment of the present invention peak regulation
Optimization system structure chart, as shown in figure 5, Steam Turbine peak regulation optimization system provided by the invention includes:
First relation curve determining module 501, for determining optimal main steam pressure under conditions of exhaust steam pressure is certain
Relation curve between load, is denoted as the first relation curve, and the optimal main steam pressure is the corresponding heat consumption of the load
The smallest main steam pressure；
Second relation curve determining module 502 for changing exhaust steam pressure and maintains the exhaust steam pressure after changing constant, really
Relation curve between fixed optimal main steam pressure and load, is denoted as the second relation curve；
Coefficient determination module 503 is influenced, for according to first relation curve and second relation curve, the row of determination
Influence coefficient of the steam pressure to optimal main steam pressure；
Relation curve cluster determining module 504, for according to first relation curve and the second relation curve and described
Coefficient is influenced, is determined under different exhaust steam pressures, the relation curve between optimal main steam pressure and load obtains relation curve
Cluster；
Adjustment module 505, for the sliding pressure of Steam Turbine to be adjusted according to the relation curve cluster.
Wherein, the first relation curve determining module 501 and the second relation curve determining module 502 include:
Optimal main steam pressure determination unit determines corresponding to multiple assumed loads for maintaining exhaust steam pressure constant
Optimal main steam pressure；Specifically include: main steam pressure obtains subelement, for obtaining the main steam pressure of Steam Turbine；It is main
Steam pressure adjustment subelement centered on the main steam pressure, is being set for maintaining exhaust steam pressure and assumed load constant
The main steam pressure is adjusted within the scope of constant-pressure；Calculation of heat rate subelement, for calculating the Steam Turbine in the steam discharge
The heat consumption of pressure, assumed load and main steam pressure tubine group adjusted；Minimum heat consumption determines subelement, for
The minimum target of heat consumption carries out feedback regulation to the main steam pressure in setting pressure limit, until obtaining the smallest heat
Consumption；Optimal main steam pressure determines subelement, and corresponding main steam pressure when for determining the heat consumption minimum is denoted as optimal master
Steam pressure.
Linear fit unit, for determined by the assumed load and its corresponding optimal main steam pressure point with
And sliding pressure operation starting point and ending point carries out linear fit, obtains the relation curve between optimal main steam pressure and load.
The influence coefficient determination module 504, specifically includes:
Factor determination unit is influenced, for according to kc=Δ Po/ΔPcExhaust steam pressure is calculated to the shadow of optimal main steam pressure
Ring coefficient, wherein kcTo influence coefficient, Δ PoFor same load the corresponding main steam pressure of first relation curve and
The difference of the corresponding main steam pressure of second relation curve, Δ PcIt is bent for the corresponding exhaust steam pressure of the first relation curve and the second relationship
The difference of the corresponding exhaust steam pressure of line.
The adjustment module 505, specifically includes:
On-site parameters acquiring unit, for obtaining the exhaust steam pressure and load at Steam Turbine scene；
The optimal main steam pressure determination unit in scene, for determined according to the relation curve cluster scene exhaust steam pressure and
Optimal main steam pressure corresponding to load；
Sliding pressure exports acquiring unit, for obtaining the pressure value of sliding pressure module output；
Pressure difference determination unit, the difference of the pressure value for determining main steam pressure and the output of sliding pressure module；
Sliding pressure adjusts unit, for being adjusted according to difference to the sliding pressure module.
Steam Turbine peak regulation optimization system provided by the invention, it is contemplated that Turbine Cold Junction exhaust steam pressure is to hot end main steam
The influence of pressure, and variable coefficient processing has been carried out to sliding pressure operation curve processed according to influence, sliding pressure operation set of curves is drawn, is realized
Unit under any exhaust steam pressure can greatly improve peak load regulation by the optimal main steam pressure of sliding pressure operation Curve selection
Performance driving economy.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For system disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is said referring to method part
It is bright.
Used herein a specific example illustrates the principle and implementation of the invention, and above embodiments are said
It is bright to be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art, foundation
Thought of the invention, there will be changes in the specific implementation manner and application range.In conclusion the content of the present specification is not
It is interpreted as limitation of the present invention.
Claims (10)
1. a kind of Steam Turbine peak regulation optimization method, which is characterized in that the described method includes:
Under conditions of exhaust steam pressure is certain, the relation curve between optimal main steam pressure and load is determined, be denoted as the first pass
It is curve, the optimal main steam pressure is the smallest main steam pressure of the corresponding heat consumption of the load；
Change exhaust steam pressure and maintain the exhaust steam pressure after changing constant, determines the relationship between optimal main steam pressure and load
Curve is denoted as the second relation curve；
According to first relation curve and second relation curve, influence of the exhaust steam pressure to optimal main steam pressure is determined
Coefficient；
According to first relation curve and the second relation curve and the influence coefficient, determine under different exhaust steam pressures,
Relation curve between optimal main steam pressure and load obtains relation curve cluster；
The sliding pressure of Steam Turbine is adjusted according to the relation curve cluster.
2. Steam Turbine peak regulation optimization method according to claim 1, which is characterized in that the optimal main steam pressure of determination
Relation curve between power and load, specifically includes:
It maintains exhaust steam pressure constant, determines optimal main steam pressure corresponding to multiple assumed loads；
To point and sliding pressure operation starting point and end determined by the assumed load and its corresponding optimal main steam pressure
Stop carries out linear fit, obtains the relation curve between optimal main steam pressure and load.
3. Steam Turbine peak regulation optimization method according to claim 2, which is characterized in that the maintenance exhaust steam pressure is not
Become, determine optimal main steam pressure corresponding to multiple assumed loads, specifically include:
Obtain the main steam pressure of Steam Turbine；
It maintains exhaust steam pressure and assumed load constant, centered on the main steam pressure, adjusts institute in setting pressure limit
State main steam pressure；
The Steam Turbine is calculated in the exhaust steam pressure, assumed load and main steam pressure tubine group adjusted
Heat consumption；
With the minimum target of heat consumption, feedback regulation is carried out to the main steam pressure in setting pressure limit, until obtaining most
Small heat consumption；
It determines corresponding main steam pressure when the heat consumption minimum, is denoted as optimal main steam pressure.
4. Steam Turbine peak regulation optimization method according to claim 1, which is characterized in that described according to first relationship
Curve and second relation curve determine influence coefficient of the exhaust steam pressure to optimal main steam pressure, specifically include:
According to kc=Δ Po/ΔPcCalculate influence coefficient of the exhaust steam pressure to optimal main steam pressure, wherein kcTo influence coefficient,
ΔPoFor same load the corresponding main steam pressure of first relation curve in the corresponding main steam of the second relation curve
The difference of pressure, Δ PcFor the difference of the corresponding exhaust steam pressure of the first relation curve and the corresponding exhaust steam pressure of the second relation curve.
5. Steam Turbine peak regulation optimization method according to claim 1, which is characterized in that described according to the relation curve
The sliding pressure of Steam Turbine is adjusted in cluster, specifically includes:
Obtain the exhaust steam pressure and load at Steam Turbine scene；
Optimal main steam pressure corresponding to the exhaust steam pressure and load for determining scene according to the relation curve cluster；
Obtain the pressure value of sliding pressure module output；
Determine the difference of the pressure value of main steam pressure and the output of sliding pressure module；
The sliding pressure module is adjusted according to difference.
6. a kind of Steam Turbine peak regulation optimization system, which is characterized in that the system comprises:
First relation curve determining module, for determining optimal main steam pressure and load under conditions of exhaust steam pressure is certain
Between relation curve, be denoted as the first relation curve, the optimal main steam pressure is that the corresponding heat consumption of the load is the smallest
Main steam pressure；
Second relation curve determining module for changing exhaust steam pressure and maintains the exhaust steam pressure after changing constant, determines optimal
Relation curve between main steam pressure and load is denoted as the second relation curve；
Coefficient determination module is influenced, for determining exhaust steam pressure according to first relation curve and second relation curve
Influence coefficient to optimal main steam pressure；
Relation curve cluster determining module, for being according to first relation curve and the second relation curve and the influence
Number, determines under different exhaust steam pressures, and the relation curve between optimal main steam pressure and load obtains relation curve cluster；
Adjustment module, for the sliding pressure of Steam Turbine to be adjusted according to the relation curve cluster.
7. Steam Turbine peak regulation optimization system according to claim 6, which is characterized in that
The first relation curve determining module and the second relation curve determining module include:
Optimal main steam pressure determination unit determines optimal corresponding to multiple assumed loads for maintaining exhaust steam pressure constant
Main steam pressure；
Linear fit unit, for point determined by the assumed load and its corresponding optimal main steam pressure and cunning
Pressure operation starting point and ending point carries out linear fit, obtains the relation curve between optimal main steam pressure and load.
8. Steam Turbine peak regulation optimization system according to claim 7, which is characterized in that the optimal main steam pressure is true
Order member, specifically includes:
Main steam pressure obtains subelement, for obtaining the main steam pressure of Steam Turbine；
Main steam pressure adjusts subelement, for maintaining exhaust steam pressure and assumed load constant, with the main steam pressure is
The heart adjusts the main steam pressure in setting pressure limit；
Calculation of heat rate subelement, for calculating the Steam Turbine in the exhaust steam pressure, assumed load and master adjusted
The heat consumption of steam pressure tubine group；
Minimum heat consumption determines subelement, for setting in pressure limit to the main steam pressure with the minimum target of heat consumption
Feedback regulation is carried out, until obtaining the smallest heat consumption；
Optimal main steam pressure determines subelement, and corresponding main steam pressure when for determining the heat consumption minimum is denoted as optimal
Main steam pressure.
9. Steam Turbine peak regulation optimization system according to claim 6, which is characterized in that the influence coefficient determines mould
Block specifically includes:
Factor determination unit is influenced, for according to kc=Δ Po/ΔPcCalculate influence system of the exhaust steam pressure to optimal main steam pressure
Number, wherein kcTo influence coefficient, Δ PoIt is same load in the corresponding main steam pressure of first relation curve and second
The difference of the corresponding main steam pressure of relation curve, Δ PcFor the corresponding exhaust steam pressure of the first relation curve and the second relation curve pair
The difference for the exhaust steam pressure answered.
10. Steam Turbine peak regulation optimization system according to claim 6, which is characterized in that the adjustment module is specific to wrap
It includes:
On-site parameters acquiring unit, for obtaining the exhaust steam pressure and load at Steam Turbine scene；
The optimal main steam pressure determination unit in scene, for determining the exhaust steam pressure and load at scene according to the relation curve cluster
Corresponding optimal main steam pressure；
Sliding pressure exports acquiring unit, for obtaining the pressure value of sliding pressure module output；
Pressure difference determination unit, the difference of the pressure value for determining main steam pressure and the output of sliding pressure module；
Sliding pressure adjusts unit, for being adjusted according to difference to the sliding pressure module.
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