CN109236391A - A kind of calculation method of cogeneration units peak regulation range - Google Patents
A kind of calculation method of cogeneration units peak regulation range Download PDFInfo
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- CN109236391A CN109236391A CN201811055140.3A CN201811055140A CN109236391A CN 109236391 A CN109236391 A CN 109236391A CN 201811055140 A CN201811055140 A CN 201811055140A CN 109236391 A CN109236391 A CN 109236391A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
- F01D21/003—Arrangements for testing or measuring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
- F22B35/18—Applications of computers to steam boiler control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
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Abstract
The invention discloses a kind of calculation methods of cogeneration units peak regulation range, it include: Step 1: according to co-generator group thermodynamic property data and heat supply extraction flow, using unit heat supply extraction flow as X-axis, using unit generation load as Y-axis, it is fitted determines that unit AGC maximum output load line, boiler minimum steady fire unit minimum generation load line under power output load line and supplying thermal condition respectively；Step 2: unit minimum generation load line under the unit AGC maximum output load line determining according to step 1 fitting, boiler minimum steady combustion power output load line and supplying thermal condition, calculates the schedulable generation load lower limit of unit AGC under any heat supply extraction flow, the schedulable generation load upper limit of unit AGC and the schedulable generation load range of unit AGC.The present invention is by achieving the purpose that improve heat supply period power grid depth peak modulation capacity in the schedulable minimum generation load of line computation, as far as possible expansion unit load lower limit.
Description
Technical field
The invention belongs to large-scale cogeneration units technical field of power generation control, and in particular to a kind of cogeneration units tune
The calculation method of peak range.
Background technique
Installed capacity of wind-driven power is continuously increased in recent years, is concentrated mainly on three northern areas of China, but these areas are especially northern
Area is such as northeast, Inner Mongolia, and large-scale cogeneration units ratio is high in power grid, but its peak modulation capacity is limited, Winter heat supply
Phase, strong wind phase and dry season, heat supply are highlighted with wind-powered electricity generation contradiction is received, and cause winter abandonment situation serious；And as electricity consumption is negative
Lotus peak-valley difference is growing, especially heat supply period in winter, and the power grid generation load section schedulable to unit is very small, for dimension
The balance for holding electric network swim, leads to net that interior pure condensate Unit Commitment is frequent, the stability and warp of Condensing steam turine under depth peak regulation operating condition
Ji property become very poor so that net in generating set average energy consumption level increase, it is very uneconomical, waste it is larger.To cogeneration of heat and power
Unit carries out more scientific scheduling, sufficiently excavates its peak modulation capacity, and so that it is participated in power grid depth peak regulation safely becomes urgent need solution
Certainly the problem of.
Cogeneration units carry two kinds of loads of power generation and heat supply simultaneously, in the past due to unilaterally emphasizing for thermally safe,
The scheduling of cogeneration units electric load is carried out by the way of appraising and deciding power output according to maximum heating load, and scheduling lower limit is very high, is caused
Its peak modulation capacity fails to give full play to；Change and the situation that electric load lower limit is scheduled, machine are appraised and decided with short time peak heating load
Group electric load scheduling interval becomes dynamic change from fixation, and dispatching of power netwoks is enable directly to grasp thermal power plant unit heat supply situation and tune
Peak energy power and be scheduled.Cogeneration units rationally participate in peak load regulation network frequency modulation, for energy-saving and emission-reduction, consumption clean energy resource,
Economic load dispatching is carried out to play a significant role.
Therefore, it is necessary to cogeneration units in the case where guaranteeing heat supply security situation, negative according to the adjustment power generation of heating demand demand
Lotus sufficiently participates in power grid depth peak regulation, also just it needs to be determined that cogeneration units AGC (Automatic under different heating demands
Generation Control, Automatic Generation Control) schedulable generation load range.Currently, many researchs of this aspect are
The relationship for deriving generation load and main steam flow and extraction flow is calculated, not the system of turbine low pressure cylinder minimum displacement
About factor fully considers into；In addition, it is desirable to for above-mentioned measuring point is fitted without on many large-scale cogeneration units steam turbines
Or the problem that measurement is difficult, precision is very poor, indirect survey calculation or amendment are carried out, to monitor on-line, calculate and to judge.
Summary of the invention
In order to solve shortcoming present in above-mentioned technology, the present invention provides a kind of cogeneration units peak regulation ranges
Calculation method.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: a kind of cogeneration units peak regulation range
Calculation method, comprising the following steps:
Step 1: according to co-generator group thermodynamic property data and heat supply extraction flow, with unit heat supply steam extraction
Flow is X-axis, using unit generation load as Y-axis, is fitted determines unit AGC maximum output load line, the combustion of boiler minimum steady respectively
Unit minimum generation load line under load line and the supplying thermal condition of contributing；
Step 2: unit is minimum under the boiler minimum steady combustion power output load line and supplying thermal condition of the fitting determination of simultaneous step 1
Generation load line solves the schedulable generation load lower limit of unit AGC；
Step 3: the unit AGC maximum output load line determining according to step 1 fitting, boiler minimum steady combustion power output load
Unit minimum generation load line under line and supplying thermal condition, the above-mentioned fit equation of simultaneous calculate machine under any heat supply extraction flow
The schedulable generation load lower limit of group AGC, the schedulable generation load upper limit of unit AGC and the schedulable generation load range of unit AGC,
Real-time data are provided for power grid depth peak regulation to support.
Further, in the step 1, the unit AGC maximum output load line examines work by the specified heat consumption of steam turbine
The fitting of unit generation load determines under unit maximum generation load and specified heating demand operating condition under condition, unit AGC maximum output
Load line:
Y=A1X+B1,
Wherein, X is unit heat supply extraction flow, A1And B1For constant, Y is unit generation load；
The boiler minimum steady combustion power output load line determines that boiler minimum steady is fired by boiler minimum steady combustion test data fitting
Power output load line:
Y=A2X+B2,
Wherein, X is unit heat supply extraction flow, A2And B2For constant, Y is unit generation load；
The determination method of unit minimum generation load line under the supplying thermal condition are as follows:
Step (1) is examined under operating condition under unit maximum generation load, specified heating demand operating condition by the specified heat consumption of steam turbine
The specified heat consumption examination of unit generation load, steam turbine and specified heating demand operating condition tubine low pressure (LP) cylinder exhaust steam flow, steamer
Machine low pressure (LP) cylinder minimum exhaust steam flow, fitting determine unit minimum generation load under specified supplying thermal condition；
Step (2) is examined under operating condition under unit maximum generation load, specified heating demand operating condition by the specified heat consumption of steam turbine
Unit generation load, steam turbine rated generation load and specified heating demand operating condition tubine low pressure (LP) cylinder exhaust steam flow, heat supply
Extraction flow, turbine low pressure cylinder minimum exhaust steam flow are fitted and determine that heat supply extraction flow is X1Unit is minimum under supplying thermal condition
Generation load；
Unit minimum generation load and heat supply extraction flow are X under step (3) the specified supplying thermal condition determining according to fitting1
Unit minimum generation load under supplying thermal condition is fitted and determines unit minimum generation load line under supplying thermal condition: Y=A3X+B3,
Wherein, X is unit heat supply extraction flow, A3And B3For constant, Y is unit generation load.
Further, the calculation method of the cogeneration units peak regulation range, further includes:
Step 4: determining cogeneration units pure condensate work according to the schedulable generation load range of unit AGC obtained by step 3
The schedulable generation load range of AGC under the schedulable generation load range of AGC and supplying thermal condition under condition, method particularly includes:
Wherein, the schedulable generation load method of determining range of AGC includes: under the cogeneration units pure condensate operating condition
Step (1), the boiler minimum steady combustion power output load line determining according to fitting, the unit when heat supply extraction flow is zero
Generation load be the schedulable generation load lower limit of AGC；
Step (2), the unit AGC maximum output load line determining according to fitting, the unit when heat supply extraction flow is zero
Generation load be the schedulable generation load upper limit of AGC；
The schedulable generation load method of determining range of AGC includes: under the cogeneration units supplying thermal condition
Step (1), the pot when unit heat supply extraction flow is less than critical heat supply extraction flow and is greater than zero, according to fitting
Furnace minimum steady combustion power output load line determines the generation load of the unit under different heat supply extraction flows, i.e. the schedulable power generation of AGC is negative
Lotus lower limit；
Step (2), when unit heat supply extraction flow be greater than critical heat supply extraction flow and be less than specified heat supply extraction flow
When, determine that the power generation of the unit under different heat supply extraction flows is negative according to unit minimum generation load line under the supplying thermal condition of fitting
The schedulable generation load lower limit of lotus, i.e. AGC；
Step (3), the unit AGC maximum output load line determining according to fitting, when heat supply steam extraction stream is greater than zero and is less than
The generation load of unit is the schedulable generation load upper limit of AGC when specified heat supply extraction flow.
Further, under the supplying thermal condition to cogeneration units unit minimum generation load critical heat supply steam extraction stream
Method for determination of amount, comprising the following steps:
Unit is minimum under the determining boiler minimum steady combustion power output load line equation of step (1), simultaneous fitting and supplying thermal condition
Generation load line equation calculation solves；
Step (2), the heat supply extraction flow value obtained according to solution, determine peak load regulation load range lower limit, because low
The case where being fired power limit out by boiler minimum steady in this heat supply extraction flow the case where, being higher than this heat supply extraction flow is by vapour
The limitation of turbine low pressure (LP) cylinder minimum displacement.
Further, the calculation method of the cogeneration units peak regulation range, further includes:
Step 5: to cogeneration units heat supply extraction flow hard measurement, its value of real-time monitoring and based on fit equation
It calculates, unit is monitored in depth peak regulation for judging the boundary condition needed for calculating to turbine low pressure cylinder exhaust steam flow hard measurement
When low pressure (LP) cylinder cooling flow, guarantee unit safety.
Further, in the step 5, the flexible measurement method of cogeneration units steam turbine heat supply extraction flow includes
Following steps:
Step (1), foundation co-generator group thermodynamic property data examine operating condition by the specified heat consumption of T Steam Turbine HA
Into unit generation load under vapour steam flow, specified heating demand operating condition, unit is sent out for lower unit maximum generation load and steam turbine
Electric load, polynomial fitting determine steam turbine heat supply extraction flow:
Y=K1X1+Q1X2,
Wherein, X1It is steam turbine into vapour steam flow, X2For unit generation load, K1And Q1For constant, Y is steam turbine confession
Hot extraction flow.
Step (2) is directed to the steam extraction enthalpy difference under different heat supply extraction pressures, runs model using common thermal power plant unit typical case
Heat supply extraction flow is modified after enclosing interior properties of water and steam parameter fitting.
Further, in the step 5, the flexible measurement method packet of cogeneration units turbine low pressure cylinder exhaust steam flow
Include following steps:
Step (1) is according to co-generator group thermodynamic property data, by under the specified heat consumption examination operating condition of T Steam Turbine HA
Unit maximum generation load and steam turbine are into unit generation load, steam turbine volume under vapour steam flow, specified heating demand operating condition
Determine THA operating condition and specified heating demand operating condition tubine low pressure (LP) cylinder exhaust steam flow, unit generation load, polynomial fitting determine vapour
Turbine low pressure (LP) cylinder exhaust steam flow:
Y=K2X1+Q2X2,
Wherein, X1It is steam turbine into vapour steam flow, X2For unit generation load, K2And Q2For constant, Y is that steam turbine is low
Cylinder pressure exhaust steam flow.
For the steam extraction enthalpy difference under different heat supply extraction pressures, using the water in common thermal power plant unit typical case range of operation
Heat supply extraction flow is modified with after the fitting of water vapour thermo property parameters.
Further, the calculation method of the cogeneration units peak regulation range, further includes:
Step 6: according to fitting unit AGC maximum output load line obtained by step 1, boiler minimum steady combustion power output load line
With unit minimum generation load line under supplying thermal condition, using heat supply extraction flow as abscissa, unit generation load is drawn for ordinate
Heat supply extraction flow-unit generation load chart processed；
Utilize the number such as the heat supply extraction flow of on-line monitoring, main steam flow, unit generation load, low pressure (LP) cylinder exhaust steam flow
According to real-time to calculate and intuitively show the schedulable generation load upper limit value and lower limit value of unit AGC and peak regulation model under different heat supply extraction flows
It encloses, and its calculated result list real-time display is come out.
The present invention carries out curve fitting according to cogeneration units Steam Turbine Thermal Property data, and according to the practical work of unit
Condition operation data is modified, under line computation difference heat supply extraction flow the schedulable generation load lower limit of unit AGC, the upper limit and
Peak regulation range provides foundation and reference for power plant's operation and dispatching of power netwoks, using safe and simple, practical in engineering, can satisfy
It is required that；Especially by the schedulable generation load lower limit of AGC for obtaining the unit under different heat supply extraction flows in line computation, i.e.,
Schedulable minimum generation load, as far as possible expansion unit load lower limit, reach the mesh for improving heat supply period power grid depth peak modulation capacity
's；In addition, also carrying out hard measurement to heat supply extraction flow and turbine low pressure cylinder exhaust steam flow, solve many large-scale thermoelectricity connection
It is fitted without above-mentioned measuring point in production power generator turbine or measures problem difficult, that precision is very poor.
Detailed description of the invention
Fig. 1 is the flow chart of the calculation method of cogeneration units peak regulation range of the invention.
Fig. 2 is the schedulable generation load range curve graph of AGC under cogeneration units difference heat supply extraction flow.
Specific embodiment
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
A kind of calculation method of cogeneration units peak regulation range as shown in Figure 1, comprises the following methods:
1) with a certain cogeneration units thermodynamic property data instance, the power generator turbine pattern is subcritical, resuperheat,
Two steam discharge of two cylinder, heating extraction turbine, specified supplying thermal condition data are as shown in table 1:
The specified supplying thermal condition data of 1 steam turbine of table
| Model | C300/235-16.7/0.35/537/537 |
| Pattern | Resuperheat, two steam discharge of two cylinder, heating extraction turbine |
| Rated power | 300MW |
| Pressure/Temperature before specified main inlet throttle-stop valve | 16.7MPa/537℃ |
| Specified/MCR steam flow | :872.6t/h/1025.0t/h |
| Specified heating extraction pressure/steam extraction amount | 0.35MPa/400.0t/h |
| Specified supplying thermal condition exhaust steam pressure | 4.9kPa |
| Allow continuous work low pressure (LP) cylinder minimum displacement | 90.0t/h |
The co-generator group thermodynamic property data arrange as shown in table 2:
2 co-generator group thermodynamic property data of table
2) according to co-generator group thermodynamic property data and heat supply extraction flow, by T Steam Turbine HA (specified heat consumption
Examine operating condition) under unit maximum generation load 300MW, unit generation load 235MW under specified heating demand 400t/h operating condition intends
It closes and determines unit AGC maximum output load line, AB line as shown in Figure 2:
Y=A1X+B1,
Wherein, X is unit heat supply extraction flow, A1And B1For constant, Y is unit generation load；
Such as Fig. 2, by A point (0,300) maximum generation load operation point, main steam flow 872.6t/h；B point (400,235),
Specified heating demand operating point, main steam flow 872.6t/h, because when one timing of heat supply extraction flow, it can be approximate by generator
Power and steam turbine throttle flow regard linear relationship as, can be obtained with least square method fitting:
Y=-0.1625X+300；A1=-0.1625, B1=300.
3) according to co-generator group thermodynamic property data and heat supply extraction flow, test number is fired by boiler minimum steady
According to main steam flow is 35%BMCR (boiler maximum continuous rating 1025t/h) when the unit minimum steady is fired, this operating condition corresponds to machine
Thus load 120MW under group generation load 40%THA operating condition is fitted and determines boiler minimum steady combustion power output load line, as shown in Figure 2
DE line:
Y=A2X+B2,
Wherein, X is unit heat supply extraction flow, A2And B2For constant, Y is unit generation load；
Such as Fig. 2, E point (0,120) minimum steady fires generation load operating point, main steam flow 349.5t/h；D point (165,
93.2) unit minimum generation load corresponding maximum heat supply extraction flow operating point when, boiler minimum steady is fired, i.e., critical heat supply are taken out
Steam flow amount is calculated by method and step later.
Y=-0.1625X+120；A2=-0.1625, B2=120.
4) according to co-generator group thermodynamic property data, by unit under the specified heat consumption examination operating condition of T Steam Turbine HA
Unit generation load 235MW under maximum generation load 300MW, specified heating demand 400t/h operating condition, T Steam Turbine HA, 75%,
50%, 40%, 30%THA operating condition and specified supplying thermal condition tubine low pressure (LP) cylinder exhaust steam flow be respectively 559.944t/h,
Under 425.829t/h, 301.709t/h, 251.518t/h, 192.824t/h and 228.104t/h, maximum heat supply 625t/h operating condition
Turbine low pressure cylinder exhaust steam flow 122.946t/h, turbine low pressure cylinder minimum exhaust steam flow 90t/h to main steam flow, are supplied
The sum of hot steam extraction amount and low pressure (LP) cylinder displacement determine that unit minimum generates electricity negative under specified supplying thermal condition with least square method fitting
Lotus.
Y=1.9391X-345.1719,
Wherein, X is the sum of heat supply steam extraction amount and low pressure (LP) cylinder displacement, and Y is main steam flow.
When X is 490t/h, main steam flow Y is 605t/h, according to main steam flow and load ratio relation, corresponding hair
Electric load is 208MW, such as Fig. 2 C point (400,208).
5) specified by heat supply extraction flow 300t/h, T Steam Turbine HA according to co-generator group thermodynamic property data
Unit generation load under unit maximum generation load 300MW, specified heating demand 400t/h operating condition under heat consumption examination operating condition
235MW, steam turbine rated generation load and specified heating demand operating condition tubine low pressure (LP) cylinder exhaust steam flow 559.944t/h and
228.104t/h, turbine low pressure cylinder minimum exhaust steam flow 90t/h are fitted and determine that unit minimum is sent out when heat supply extraction flow is X1
Electric load.
Y=208-0.1625X,
Wherein, X is heat supply extraction flow, and Y is unit generation load.
When X is 300t/h, unit generation load Y is 159.25MW, such as Fig. 2 X1 point (300,159.25).
6) unit minimum generation load C point (400,208) when the specified heat supply extraction flow 400t/h determining according to fitting
With heat supply extraction flow be 300t/h when unit minimum generation load X1 point (300,159.25), be fitted determine supplying thermal condition under
Unit minimum generation load line, CD line as shown in Figure 2:
Y=A3X+B3,
Wherein, X is unit heat supply extraction flow, A3And B3For constant, Y is unit generation load.
Y=0.4875X+13；A3=0.4875, B3=13.
7) according to 3), 6) step is fitted determining boiler minimum steady combustion power output load line DE, unit under supplying thermal condition respectively
Minimum generation load line CD, the above-mentioned fit equation of simultaneous solve the schedulable generation load lower limit of unit AGC, i.e. CDE broken line.
8) according to 2), 3), 6) step is fitted determining unit AGC maximum output load line AB, the combustion of boiler minimum steady respectively
Contribute load line DE, unit minimum generation load line CD under supplying thermal condition, and the above-mentioned fit equation of simultaneous calculates any heat supply and takes out
The schedulable generation load lower limit CDE broken line of unit AGC, the schedulable generation load upper limit AB line of AGC and AGC are schedulable under steam flow amount
Generation load range, the i.e. difference of upper limit value and lower limit value provide real-time data for power grid depth peak regulation and support.
9) according to gained simultaneous fit equation, the schedulable generation load model of AGC under cogeneration units pure condensate operating condition is determined
It encloses, the schedulable generation load range of AGC under supplying thermal condition, comprising:
(1) the boiler minimum steady determining according to fitting combustion power output load line DE, the unit when heat supply extraction flow is zero
Generation load is the schedulable generation load lower limit of AGC, which is 120MW；
(2) the unit AGC maximum output load line AB determining according to fitting, the hair of unit when heat supply extraction flow is zero
Electric load is the schedulable generation load upper limit of AGC, which is 300MW；
(3) when unit heat supply extraction flow is less than critical heat supply extraction flow 165t/h and is greater than zero, according to fitting
Boiler minimum steady combustion power output load line DE determines the generation load of the unit under different heat supply extraction flows, the i.e. schedulable hair of AGC
Electric load lower limit；
(4) when unit heat supply extraction flow is greater than critical heat supply extraction flow 165t/h and is less than specified heat supply extraction flow
When 400t/h, the unit under different heat supply extraction flows is determined according to unit minimum generation load line CD under the supplying thermal condition of fitting
Generation load, i.e. the schedulable generation load lower limit of AGC；
(5) the unit AGC maximum output load line determining according to fitting, when heat supply extraction flow is greater than zero and is less than specified
The generation load of unit is the schedulable generation load upper limit of AGC when heat supply extraction flow 400t/h.
To the determination method of the critical heat supply extraction flow of unit minimum generation load under cogeneration units supplying thermal condition:
(1) the determining boiler minimum steady of simultaneous fitting fires unit minimum under power output load line DE equation and supplying thermal condition and generates electricity
Load line CD equation calculation solves；
Y=0.4875X+13；Y=-0.1625X+120；
Linear equation in two unknowns is solved, obtaining X is 165t/h, Y 93.2MW, such as D point (165,93.2) in Fig. 2；
(2) according to obtained heat supply extraction flow value is solved, peak load regulation load range lower limit is determined, because lower than this confession
The case where the case where hot extraction flow is fired power limit out by boiler minimum steady, is higher than this heat supply extraction flow is low by steam turbine
The limitation of cylinder pressure minimum displacement.
10) it is calculated to cogeneration units heat supply extraction flow hard measurement, its value of real-time monitoring and for fit equation, it is right
Turbine low pressure cylinder exhaust steam flow hard measurement monitors unit in depth peak regulation for judging the boundary condition needed for calculating
Low pressure (LP) cylinder cooling flow guarantees unit safety.
The flexible measurement method of cogeneration units steam turbine heat supply extraction flow:
(1) according to co-generator group thermodynamic property data, by unit under the specified heat consumption examination operating condition of T Steam Turbine HA
Maximum generation load 300MW and steam turbine are sent out into unit under vapour steam flow 872.6t/h, specified heating demand 400t/h operating condition
Electric load 235t/h, unit generation load and main steam flow, polynomial fitting determine steam turbine heat supply extraction flow:
Y=K1X1+Q1X2,
Wherein, X1For main steam flow, X2For unit generation load, K1And Q1For constant, Y is steam turbine heat supply steam extraction stream
Amount；
Y=2.1157X1-6.1538X2；K1=2.1157, Q1=-6.1538.
(2) for the steam extraction enthalpy difference under different heat supply extraction pressures, using in common thermal power plant unit typical case range of operation
Properties of water and steam parameter fitting after heat supply extraction flow is modified:
Y=(2.1157X1-6.1538X2)[0.207(Ph0-Ph)]；
Wherein, Ph0For specified heat supply extraction pressure, PhFor heat supply extraction pressure.
The flexible measurement method of cogeneration units turbine low pressure cylinder exhaust steam flow:
(1) according to co-generator group thermodynamic property data, by unit under the specified heat consumption examination operating condition of T Steam Turbine HA
Maximum generation load 300MW and steam turbine are sent out into unit under vapour steam flow 872.6t/h, specified heating demand 400t/h operating condition
The specified THA operating condition of electric load 235t/h, steam turbine and specified heating demand operating condition tubine low pressure (LP) cylinder exhaust steam flow
559.944t/h and 228.104t/h, unit generation load and main steam flow, polynomial fitting determine turbine low pressure cylinder steam discharge
Flow:
Y=K2X1+Q2X2,
Wherein, X1For main steam flow, X2For unit generation load, K2And Q2For constant, Y is turbine low pressure cylinder steam discharge
Flow,
Y=559.944-1.7552X1+5.1052X2；K1=-1.7552, Q1=5.1052.
(2) for the steam extraction enthalpy difference under different heat supply extraction pressures, using in common thermal power plant unit typical case range of operation
Properties of water and steam parameter fitting after heat supply extraction flow is modified:
Y=559.944- (1.7552X1-5.1052X2)/[0.207(Ph0-Ph)]。
11) according to 2), 3), 6) fit equation obtained by step, using heat supply extraction flow as abscissa, unit generation load is
Ordinate draws heat supply extraction flow-unit generation load chart, such as Fig. 2.
12) real-time computer group heat supply extraction flow and low pressure (LP) cylinder exhaust steam flow utilize the heat supply steam extraction stream of on-line monitoring
The data such as amount, main steam flow, unit generation load, low pressure (LP) cylinder exhaust steam flow, extraction pressure are calculated and are corrected and intuitively show
The schedulable generation load upper limit value and lower limit value of unit AGC and peak regulation range under different heat supply extraction flows, and calculated result list is shown
It shows and, as table 3 is illustrated.
The schedulable generation load peak regulation range of unit AGC under the different heat supply extraction flows of table 3
Above embodiment is not limitation of the present invention, and the present invention is also not limited to the example above, this technology neck
The variations, modifications, additions or substitutions that the technical staff in domain is made within the scope of technical solution of the present invention, also belong to this hair
Bright protection scope.
Claims (8)
1. a kind of calculation method of cogeneration units peak regulation range, which comprises the following steps:
Step 1: according to co-generator group thermodynamic property data and heat supply extraction flow, with unit heat supply extraction flow
It is fitted determines unit AGC maximum output load line, boiler minimum steady combustion power output respectively using unit generation load as Y-axis for X-axis
Unit minimum generation load line under load line and supplying thermal condition；
Step 2: unit minimum generates electricity under the boiler minimum steady combustion power output load line and supplying thermal condition of the fitting determination of simultaneous step 1
Load line solves the schedulable generation load lower limit of unit AGC；
Step 3: the unit AGC maximum output load line determining according to step 1 fitting, boiler minimum steady combustion power output load line and
Unit minimum generation load line under supplying thermal condition, the above-mentioned fit equation of simultaneous calculate unit AGC under any heat supply extraction flow
The schedulable generation load upper limit of schedulable generation load lower limit, unit AGC and the schedulable generation load range of unit AGC, for electricity
Net depth peak regulation provides real-time data and supports.
2. the calculation method of cogeneration units peak regulation range according to claim 1, it is characterised in that: the step 1
In, the unit AGC maximum output load line is by unit maximum generation load under steam turbine specified heat consumption examination operating condition and specified
The fitting of unit generation load determines under heating demand operating condition, unit AGC maximum output load line:
Y=A1X+B1,
Wherein, X is unit heat supply extraction flow, A1And B1For constant, Y is unit generation load；
The boiler minimum steady combustion power output load line determines that the combustion of boiler minimum steady is contributed by boiler minimum steady combustion test data fitting
Load line:
Y=A2X+B2,
Wherein, X is unit heat supply extraction flow, A2And B2For constant, Y is unit generation load；
The determination method of unit minimum generation load line under the supplying thermal condition are as follows:
Step (1), by unit under unit maximum generation load, specified heating demand operating condition under steam turbine specified heat consumption examination operating condition
The specified heat consumption examination of generation load, steam turbine and specified heating demand operating condition tubine low pressure (LP) cylinder exhaust steam flow, steam turbine are low
Cylinder pressure minimum exhaust steam flow, fitting determine unit minimum generation load under specified supplying thermal condition；
Step (2), by unit under unit maximum generation load, specified heating demand operating condition under steam turbine specified heat consumption examination operating condition
Generation load, steam turbine rated generation load and specified heating demand operating condition tubine low pressure (LP) cylinder exhaust steam flow, heat supply steam extraction
Flow, turbine low pressure cylinder minimum exhaust steam flow are fitted and determine that heat supply extraction flow is X1Unit minimum generates electricity under supplying thermal condition
Load；
Unit minimum generation load and heat supply extraction flow are X under step (3) the specified supplying thermal condition determining according to fitting1Heat supply
Unit minimum generation load under operating condition is fitted and determines unit minimum generation load line under supplying thermal condition: Y=A3X+B3,
Wherein, X is unit heat supply extraction flow, A3And B3For constant, Y is unit generation load.
3. the calculation method of cogeneration units peak regulation range according to claim 2, it is characterised in that: the thermoelectricity connection
Produce the calculation method of peak load regulation range, further includes:
Step 4: being determined under cogeneration units pure condensate operating condition according to the schedulable generation load range of unit AGC obtained by step 3
The schedulable generation load range of AGC under the schedulable generation load range of AGC and supplying thermal condition, method particularly includes:
Wherein, the schedulable generation load method of determining range of AGC includes: under the cogeneration units pure condensate operating condition
Step (1), the boiler minimum steady combustion power output load line determining according to fitting, the hair of unit when heat supply extraction flow is zero
Electric load is the schedulable generation load lower limit of AGC；
Step (2), the unit AGC maximum output load line determining according to fitting, the hair of unit when heat supply extraction flow is zero
Electric load is the schedulable generation load upper limit of AGC；
The schedulable generation load method of determining range of AGC includes: under the cogeneration units supplying thermal condition
Step (1), when unit heat supply extraction flow be less than critical heat supply extraction flow and be greater than zero when, according to fitting boiler most
Low steady combustion power output load line determines the generation load of the unit under different heat supply extraction flows, i.e. under the schedulable generation load of AGC
Limit；
Step (2), when unit heat supply extraction flow be greater than critical heat supply extraction flow and be less than specified heat supply extraction flow when, according to
The generation load of the unit under different heat supply extraction flows is determined according to unit minimum generation load line under the supplying thermal condition of fitting, i.e.,
The schedulable generation load lower limit of AGC；
Step (3), the unit AGC maximum output load line determining according to fitting, when heat supply steam extraction stream is greater than zero and is less than specified
The generation load of unit is the schedulable generation load upper limit of AGC when heat supply extraction flow.
4. the calculation method of cogeneration units peak regulation range according to claim 3, it is characterised in that: described to thermoelectricity
The determination method of the critical heat supply extraction flow of unit minimum generation load under coproduction unit supplying thermal condition, comprising the following steps:
Unit minimum generates electricity under the determining boiler minimum steady combustion power output load line equation of step (1), simultaneous fitting and supplying thermal condition
Load line equation calculation solves；
Step (2), the heat supply extraction flow value obtained according to solution, determine peak load regulation load range lower limit, because being lower than this
The case where the case where heat supply extraction flow is fired power limit out by boiler minimum steady, is higher than this heat supply extraction flow is by steam turbine
The limitation of low pressure (LP) cylinder minimum displacement.
5. the calculation method of cogeneration units peak regulation range according to claim 4, it is characterised in that: the thermoelectricity connection
Produce the calculation method of peak load regulation range, further includes:
Step 5: its value of real-time monitoring is simultaneously calculated for fit equation, right to cogeneration units heat supply extraction flow hard measurement
Turbine low pressure cylinder exhaust steam flow hard measurement monitors unit in depth peak regulation for judging the boundary condition needed for calculating
Low pressure (LP) cylinder cooling flow guarantees unit safety.
6. the calculation method of cogeneration units peak regulation range according to claim 5, it is characterised in that: the step 5
In, the flexible measurement method of cogeneration units steam turbine heat supply extraction flow the following steps are included:
Step (1), foundation co-generator group thermodynamic property data, by machine under the specified heat consumption examination operating condition of T Steam Turbine HA
Into unit generation load under vapour steam flow, specified heating demand operating condition, unit generation is negative for group maximum generation load and steam turbine
Lotus, polynomial fitting determine steam turbine heat supply extraction flow:
Y=K1X1+Q1X2,
Wherein, X1It is steam turbine into vapour steam flow, X2For unit generation load, K1And Q1For constant, Y is steam turbine heat supply steam extraction
Flow.
Step (2) is directed to the steam extraction enthalpy difference under different heat supply extraction pressures, using in common thermal power plant unit typical case range of operation
Properties of water and steam parameter fitting after heat supply extraction flow is modified.
7. the calculation method of cogeneration units peak regulation range according to claim 6, it is characterised in that: the step 5
In, the flexible measurement method of cogeneration units turbine low pressure cylinder exhaust steam flow the following steps are included:
Step (1) is according to co-generator group thermodynamic property data, by unit under the specified heat consumption examination operating condition of T Steam Turbine HA
Maximum generation load and steam turbine are into unit generation load, the specified THA of steam turbine under vapour steam flow, specified heating demand operating condition
Operating condition and specified heating demand operating condition tubine low pressure (LP) cylinder exhaust steam flow, unit generation load, polynomial fitting determine steam turbine
Low pressure (LP) cylinder exhaust steam flow:
Y=K2X1+Q2X2,
Wherein, X1It is steam turbine into vapour steam flow, X2For unit generation load, K2And Q2For constant, Y is turbine low pressure cylinder row
Steam flow amount.
For the steam extraction enthalpy difference under different heat supply extraction pressures, using the Shui Heshui in common thermal power plant unit typical case range of operation
Heat supply extraction flow is modified after the fitting of steam thermo property parameters.
8. the calculation method of cogeneration units peak regulation range according to claim 7, it is characterised in that: the thermoelectricity connection
Produce the calculation method of peak load regulation range, further includes:
Step 6: according to fitting unit AGC maximum output load line, boiler minimum steady combustion power output load line obtained by step 1 and confession
Unit minimum generation load line under thermal condition, using heat supply extraction flow as abscissa, unit generation load is that ordinate draws confession
Hot extraction flow-unit generation load chart；
Using data such as the heat supply extraction flow of on-line monitoring, main steam flow, unit generation load, low pressure (LP) cylinder exhaust steam flows,
It is real-time to calculate and intuitively show the schedulable generation load upper limit value and lower limit value of unit AGC and peak regulation range under different heat supply extraction flows,
And its calculated result list real-time display is come out.
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