CN106382615B - The multiple Switching Logic Control of Reheat Steam Temperature policy validation system and method for extra-supercritical unit - Google Patents
The multiple Switching Logic Control of Reheat Steam Temperature policy validation system and method for extra-supercritical unit Download PDFInfo
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- CN106382615B CN106382615B CN201610729603.4A CN201610729603A CN106382615B CN 106382615 B CN106382615 B CN 106382615B CN 201610729603 A CN201610729603 A CN 201610729603A CN 106382615 B CN106382615 B CN 106382615B
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G5/00—Controlling superheat temperature
- F22G5/04—Controlling superheat temperature by regulating flue gas flow, e.g. by proportioning or diverting
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
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Abstract
A kind of multiple Switching Logic Control of Reheat Steam Temperature policy validation system and method for extra-supercritical unit, it is by the multiple reheat steam temperature dynamic simulation environment of extra-supercritical unit before unit commitment operation, control logic to reheat steam temperature is verified and optimized including flue gas recirculation, tilting burner, gas baffle, to shorten the actual set Start-up and Adjustment time；The problem of also solving to be limited by service condition when optimizing actual set Adjustment Tests after going into operation simultaneously.The system includes master computer, dynamic simulation environmental model, virtual controlling station computer, multiple Switching Logic Control of Reheat Steam Temperature logic, Virtual Controller VDCS, man-machine interface and I/O bitcoms；And by introducing fineness of pulverized coal, oxygen amount and n reheat pressure, the method for steam temperature amendment setting value, optimize Switching Logic Control of Reheat Steam Temperature logic, to realize the control of extra-supercritical unit multiple reheat steam temperature high-quality, meet that the multiple reheating embrittlement of ultra supercritical is safe and stable and Effec-tive Function the need for.
Description
Technical field：
The invention belongs to power station extra-supercritical unit automatic control technology field, and in particular to a kind of extra-supercritical unit is more
Secondary Switching Logic Control of Reheat Steam Temperature policy validation system and method.
Background technology
The resources characteristic of China's " rich coal, oil-poor, few gas ", determines coal fired power generation in China's energy resource structure mainly
Position.In face of China's rapid economic development, the immense pressure of electricity needs and environmental protection proposes new to China's energy-saving and emission-reduction
It is required that, and the generating efficiency of thermal power plant is improved, gross coal consumption rate is reduced, the application of ultra supercritical double reheat technology will be from source
Upper reduction flue gas pollutant and the most effective means of CO2 emission；And with the mature of double reheat technology,
It is possible that three thermal technologies again.But ultra supercritical double reheat power generation sets carbonated drink flow increases, Boiler Convection Heating Surface level
Number increase, arrangement are more complicated, and the sound state response characteristic of unit is varied widely, and has been connect while reheat steam temperature surpasses 600 DEG C
Nearly metal material allows temperature upper limit, and Switching Logic Control of Reheat Steam Temperature allowance is reduced, and the control of extra-supercritical unit double reheat steam temperature
Method processed is changed greatly compared with single reheat unit.Due to system complex, each control loop of machine, stove for example wind, coal, feedwater, steam temperature and
There is very strong nonlinear coupling relationship between spatial load forecasting, and the change influence factor of reheat steam temperature is more.To ensure to surpass
The smooth operation of supercritical double-reheat unit and safe and reliable operation, before actual set debugging, operation, to according to theoretical point
The double reheat Superheated Steam Temperature Control Strategy that analysis and engineering experience are designed is verified and optimized, and reference number is provided for actual set construction
Had very important significance according to guidance, in the urgent need to a kind of effective and reliable method of research.
The country before unit operation to rest on to part to resuperheat unit allocation strategy study of ultra supercritical more
Control loop and related therrmodynamic system carry out mechanistic modeling and analysis level, often assume and simplified condition is more, be confined to
It is only capable of providing tendency guidance.Use optimizes Adjustment Tests analysis method to actual set more after unit operation, but by
To the limitation of unit operation condition and can not arbitrarily, tested at any time in big load range, so far also not at the beginning of Construction of Unit
Phase verifies the research of system and method for the extra-supercritical unit double reheat Superheated Steam Temperature Control Strategy of practical engineering application.
The content of the invention
In order to overcome the problem of above-mentioned prior art is present, it is an object of the invention to provide a kind of extra-supercritical unit is many
Secondary Switching Logic Control of Reheat Steam Temperature policy validation system and method, the multiple reheat steam temperature of extra-supercritical unit is passed through before unit commitment operation
Dynamic simulation environment, to the control logic of the multiple reheat steam temperature of extra-supercritical unit (including tilting burner, flue gas recirculation,
Gas baffle and spray desuperheating control) verified and optimized, it is the debugging and operation of the multiple reheating embrittlement of extra-supercritical unit
Basic data and guidance are provided, realize that the unit regulation time that shortens, the effectively control multiple reheat steam temperature of extra-supercritical unit are permitting
Perhaps in the range of, it is ensured that extra-supercritical unit safety, economy and the purpose of stable operation.
To achieve these goals, the present invention uses following technical scheme：
A kind of multiple Switching Logic Control of Reheat Steam Temperature policy validation system of extra-supercritical unit, including master computer 1, I/O communication are soft
It is dynamic simulation environmental model 2 in the virtual controlling station computer 3 that part 7 is connected with master computer 1, the master computer 1, virtually
It is multiple Switching Logic Control of Reheat Steam Temperature logic 4, Virtual Controller VDCS 5 and man-machine interface 6 in control station computer 3；I/O communications are soft
Part 7 realizes the real-time data communication between dynamic simulation environmental model 2 and virtual controlling station computer 3；The master computer 1 from
Virtual controlling station computer 3 obtains tilting burner, flue gas recirculation, the flue gas gear that operating personnel are issued by man-machine interface 6
Plate and the instruction of spray desuperheating control operation, and result of calculation is included：Flue gas recirculation baffle opening, tilting burner angle,
Gas baffle aperture and desuperheat spray flow, n reheat steam temperature and unit real time execution analog parameter feed back to virtual controlling station
Computer 3, forms closed-loop control.
Master computer 1 is core with dynamic simulation environmental model 2, and dynamic simulation environmental model 2 is overall process dynamic analog
The multiple reheating embrittlement body process model of ultra supercritical, realize to reference to unit from cold start to operating mode at full capacity and
From operating mode at full capacity to halted state overall process real time dynamic simulation.
The dynamic simulation environmental model 2 uses larger fluid network algorithm, is meeting mass conservation law, the conservation of energy
On the premise of law, the law of conservation of momentum, it is ensured that integrality, accuracy and the real-time of the model based on Physical Mechanism；Truly
Energy conversion process and working medium in each physical process, including unit running process of simulation actual set is in not equality of temperature
Physical characteristic under degree and pressure.
A kind of verification method of the multiple Switching Logic Control of Reheat Steam Temperature policy validation system of extra-supercritical unit described above, it is described
It is attached under multiple Switching Logic Control of Reheat Steam Temperature logic 4 in Virtual Controller VDCS 5, content includes：Flue gas recirculation baffle plate, swing combustion
Burner, gas baffle and spray desuperheating control；Comprise the following steps that：
1st step：Operating personnel set ultra supercritical reheating embrittlement total load by man-machine interface 6；
2nd step：Multiple Switching Logic Control of Reheat Steam Temperature logic 4 by I/O bitcoms 7 by obtaining dynamic simulation environmental model 2
Fineness of pulverized coal, oxygen content measurement signal；
3rd step：Multiple Switching Logic Control of Reheat Steam Temperature logic 4 calculates correction factor C according to fineness of pulverized coal, oxygen amount1, C1=(1-
0.02*(R90-18)/18)*(3.35*(O2-O2 r)), wherein R90For fineness of pulverized coal, O2For burner hearth flue gas oxygen content, O2 rRepresent machine
Group declared working condition flue gas oxygen content, the O as unit load≤300MW2 rFor 5.56, O during unit load=500MW2 rFor 4.33,
O during unit load=750MW2 rFor 3.2, O during unit load=1000MW2 rFor 2.74；And to C1Carry out upper lower limit value,
0.992≤C1≤1.008；
4th step：Multiple Switching Logic Control of Reheat Steam Temperature logic 4 by I/O bitcoms 7 by obtaining dynamic simulation environmental model 2
1 ... n reheat pressure, temperature measurement signal；
5th step：Multiple Switching Logic Control of Reheat Steam Temperature logic 4 is according to 1...n reheat pressure, temperature computation correction factor C2；First
Calculate the enthalpy h of corresponding temperature and pressuren﹦ f (Pn,Tn), C2﹦ k3((h1-h1 r)+(h2-h2 r)+┄+(hn-hn r)), to it is secondary again
Heat engine group n=2, wherein P are pressure, and T is temperature, and h is enthalpy；Coefficient k3Span 500~510；And to C2Progress above and below
Limit value, 0.988≤C2≤1.012；
6th step：Multiple Switching Logic Control of Reheat Steam Temperature logic 4 calculates reheat steam temperature initial set value X, X=C1*C2*f (x), wherein
F (x) is determined according to unit total load, i.e., be 480 DEG C as unit total load ＜ 400MW, as unit total load >=400MW and ＜
When being 545 DEG C during 600MW, when unit total load >=600MW is 623 DEG C；
7th step：Multiple Switching Logic Control of Reheat Steam Temperature logic 4 carries out high-low limits calculating to reheat steam temperature initial set value X, obtains
Reheat steam temperature dynamic setting value Ts, wherein higher limit max (x)：It it is 520 DEG C as unit total load ＜ 400MW, when unit is always born
Lotus >=400MW is 628 DEG C；Lower limit min (x)：As unit total load ＜ 400MW be 460 DEG C, when unit total load >=
When being 525 DEG C during 400MW and ＜ 600MW, when unit total load >=600MW is 603 DEG C, min (x)≤Ts≤max (x)；
8th step：Multiple Switching Logic Control of Reheat Steam Temperature logic 4 by I/O bitcoms 7 by obtaining dynamic simulation environmental model 2
1 ... n reheat steam temperature measured value T1~Tn；
9th step：Multiple Switching Logic Control of Reheat Steam Temperature logic 4 is by n reheat steam temperature measured value T1~TnAverage computation obtain
Reheat steam temperature measured value T；
10th step：Multiple Switching Logic Control of Reheat Steam Temperature logic 4 calculates the dynamic setting value T of reheat steam temperatureSWith reheat steam temperature measured value T
Deviation；
11st step：Multiple Switching Logic Control of Reheat Steam Temperature logic 4 exports flue gas by PID regulator ratio, integration, differential calculation
Recycle opening amount signal；
12nd step：Multiple Switching Logic Control of Reheat Steam Temperature logic 4 by I/O bitcoms 7 by obtaining dynamic simulation environmental model 2
Steam-water separator pressure measurement signal；
13rd step：Multiple Switching Logic Control of Reheat Steam Temperature logic 4 sets flue gas recirculation baffle opening and believed as boiler main fuel trip
Number occur when corresponding flue gas recirculation baffle opening definite value；
14th step：Multiple Switching Logic Control of Reheat Steam Temperature logic 4 sets flue gas recirculation baffle plate when recirculation blower stops and opened as 0%
Degree；
15th step：Multiple Switching Logic Control of Reheat Steam Temperature logic 4 exports the instruction of flue gas recirculation baffle opening, reaches adjustment flue gas again
Internal circulating load purpose；
16th step：Multiple Switching Logic Control of Reheat Steam Temperature logic 4 calculates burning by PID regulator ratio, integration, differential calculation
Device swash angle position；
17th step：Multiple Switching Logic Control of Reheat Steam Temperature logic 4 sets burner swash angle position and sent out as boiler main fuel trip signal
Steam-water separator pressure corresponding definite value when raw；
18th step：Multiple Switching Logic Control of Reheat Steam Temperature logic 4 exports the instruction of burner swash angle position, so as to reach adjustment burner hearth fire
The purpose of flame center；
19th step：Multiple Switching Logic Control of Reheat Steam Temperature logic 4 calculates n reheat steam temperature measured value T respectively1~TnWith reheat steam temperature
Dynamic setting value TSDeviation；
20th step：Multiple Switching Logic Control of Reheat Steam Temperature logic 4 calculates the average value of n reheat steam temperature deviation；
21st step：Multiple Switching Logic Control of Reheat Steam Temperature logic 4 is opened by PID regulator ratio, integration, differential calculation gas baffle
Degree；
22nd step：When boiler main fuel trip signal occurs, the multiple setting of Switching Logic Control of Reheat Steam Temperature logic 4 gas baffle is opened
Spend for 50%, that is, be maintained at centre position；
23rd step：Multiple Switching Logic Control of Reheat Steam Temperature logic 4 is calculated by partition function obtains 1~N grade low-temp reheaters flue gas is kept off
Plate opening degree instruction；
24th step：Flue gas recycled amount is calculated according to the instruction of flue gas recirculation baffle opening by dynamic simulation environmental model 2；
25th step：Furnace flame center is calculated according to burner swash angle position by dynamic simulation environmental model 2；
26th step：By dynamic simulation environmental model 2 according to 1~N grades of reheater gas baffle apertures, which are calculated, passes through 1~It is n grades low
Warm reheater exhaust gas volumn；
27th step：1~n times reheat steam temperature is calculated by dynamic simulation environmental model 2.
The above method adds fineness of pulverized coal, flue gas oxygen content and n times again in multiple Switching Logic Control of Reheat Steam Temperature logic 4
Hot vapour presses the amendment to the dynamic setting value of multiple reheat steam temperature with steam temperature factor, and being reflected comprehensively with this influences the various of reheat steam temperature
Factor, realizes the high-quality control of reheat steam temperature；Ultra supercritical double reheat power generation sets Switching Logic Control of Reheat Steam Temperature strategy is not only applicable to test
Card and optimization, and it is applicable extra-supercritical unit Switching Logic Control of Reheat Steam Temperature policy validation and the optimization of more stages reheating.
Compared to the prior art compared with the present invention has the advantages that：
620 DEG C of grade ultra supercritical double reheat Thermal generation units still belong to tentative unit in the world, and unit is normal
Nargin during operation between the limiting temperature and design temperature of metal material is smaller, and exploration is suitable for ultra supercritical double reheat power generation sets
Control strategy, can by first and second Switching Logic Control of Reheat Steam Temperature in the reasonable scope, be ultra supercritical double reheat power generation sets it is stable,
Safety and Effec-tive Function provide reliable reference data and technological guidance.Pass through the present invention:
1. the multiple reheating embrittlement of ultra supercritical built close to Practical Project runs simulated environment, and there is provided a kind of ultra supercritical
Multiple Switching Logic Control of Reheat Steam Temperature policy validation system and method.
2. the affecting laws of flue gas recirculation, burner pivot angle, flue gas distributor aperture to multiple reheat steam temperature are verified,
Verify that it controls the reasonability of configuration logical design and optimized, provide reference for practical engineering application and predict.
3. the overall control strategy design for the multiple reheating embrittlement of ultra supercritical in startup, normal operation, accident conditions
And operation provides basic data.
Brief description of the drawings
Fig. 1 is checking system construction drawing.
Fig. 2 is double reheat carbonated drink general flow chart.
Fig. 3 is multiple Switching Logic Control of Reheat Steam Temperature logic diagram.
Specific implementation
The present invention will be described in more detail below in conjunction with the accompanying drawings.
As shown in figure 1, for the multiple Switching Logic Control of Reheat Steam Temperature policy validation system construction drawing of extra-supercritical unit, including host computer
Machine 1, dynamic simulation environmental model 2, virtual controlling station computer 3, multiple Switching Logic Control of Reheat Steam Temperature logic 4, Virtual Controller VDCS
5th, man-machine interface 6 and I/O bitcoms 7.I/O bitcoms 7 realize master computer 1 and virtual by I/O map mapping mechanisms
Real-time data communication between control station computer 3.The master computer 1 obtains operating personnel from virtual controlling station computer 3
Tilting burner, flue gas recirculation, gas baffle and the instruction of spray desuperheating control operation issued by man-machine interface；And will be main
The result of calculation of computer 1, including：Tilting burner angle, flue gas recirculation baffle opening, gas baffle aperture and spray desuperheating
Flow, n reheat steam temperature (to double reheat power generation sets n=2) and unit real time execution analog parameter feed back to virtual controlling station meter
Calculation machine 3, forms close loop control circuit.
Dynamic simulation environmental model 2 is the ultra supercritical double reheat power generation sets body process model of overall process dynamic analog,
Realize reference unit from Shang Shui, ventilation, igniting, heating, boosting, warming-up, grid-connected, load up overall process real time dynamic simulation.It is dynamic
State simulated environment model 2 is larger fluid network algorithm, and meeting, mass conservation law, law of conservation of energy, the conservation of momentum are fixed
On the premise of rule, it is ensured that integrality, accuracy and the real-time of the model based on Physical Mechanism.True simulation actual set
The physics of energy conversion process and working medium at different temperatures and pressures in each physical process, including unit running process
Characteristic.
By obtaining the software of virtual controlling station computer 3 (now unit DCS groups to the translation of unit DCS configurations project file
State is completed, but does not have started field adjustable), including man-machine interface 2 and the software of Virtual Controller VDCS 5, VDCS 5 simulation reality
The calculating process of DPU control logics and operation result is exported in unit DCS system.
It is attached under above-mentioned multiple Switching Logic Control of Reheat Steam Temperature logic 4 in Virtual Controller VDCS 5, content includes：Swing burning
Device, flue gas recirculation, gas baffle and spray desuperheating control；In addition by the adjustment of boiler operating parameter, such as fineness of pulverized coal,
The means such as operation oxygen amount, burner combination, OFA operation modes can also realize certain reheat steam temperature adjustment effect, this hair
It is bright that fineness of pulverized coal, operation oxygen amount and n reheat steam pressure and temperature are added in multiple Switching Logic Control of Reheat Steam Temperature logic 4
Amendment of the factor to the dynamic setting value of multiple reheat steam temperature.As shown in figure 3, specific calculation procedure is as follows：
1st step：Operating personnel set ultra supercritical reheating embrittlement total load by man-machine interface 6；
2nd step：Multiple Switching Logic Control of Reheat Steam Temperature logic 4 obtains the coal dust of dynamic simulation environmental model 2 by I/O bitcoms 7
Fineness, oxygen content measurement signal；
3rd step：Multiple Switching Logic Control of Reheat Steam Temperature logic 4 calculates correction factor C according to fineness of pulverized coal, oxygen amount1, C1=(1-
0.02*(R90-18)/18)*(3.35*(O2-O2 r)), wherein R90For fineness of pulverized coal, O2For burner hearth flue gas oxygen content, O2 rRepresent machine
Group declared working condition flue gas oxygen content, the O as unit load≤300MW2 rFor 5.56, O during unit load=500MW2 rFor 4.33,
O during unit load=750MW2 rFor 3.2, O during unit load=1000MW2 rFor 2.74；And to C1Carry out upper lower limit value,
0.992≤C1≤1.008；
4th step：Multiple Switching Logic Control of Reheat Steam Temperature logic 4 obtains the 1 of dynamic simulation environmental model 2 by I/O bitcoms 7 ...
N reheat pressure, temperature measurement signal；
5th step：Multiple Switching Logic Control of Reheat Steam Temperature logic 4 is according to 1...n reheat pressure, temperature computation correction factor C2；First
Calculate the enthalpy h of corresponding temperature and pressuren﹦ f (Pn,Tn), C2﹦ k3((h1-h1 r)+(h2-h2 r)+┄+(hn-hn r)), to it is secondary again
Heat engine group n=2, wherein P are pressure, and T is temperature, and h is enthalpy；Coefficient k3Span 500~510；And to C2Progress above and below
Limit value, 0.988≤C2≤1.012；
6th step：Multiple Switching Logic Control of Reheat Steam Temperature logic 4 calculates reheat steam temperature initial set value X, X=C1*C2*f (x), wherein
F (x) is determined according to unit total load, i.e., be 480 DEG C as unit total load ＜ 400MW, as unit total load >=400MW and ＜
When being 545 DEG C during 600MW, when unit total load >=600MW is 623 DEG C；
7th step：Multiple Switching Logic Control of Reheat Steam Temperature logic 4 carries out high-low limits calculating to reheat steam temperature initial set value X, obtains
Reheat steam temperature dynamic setting value Ts, wherein higher limit max (x)：It it is 520 DEG C as unit total load ＜ 400MW, when unit is always born
Lotus >=400MW is 628 DEG C；Lower limit min (x)：As unit total load ＜ 400MW be 460 DEG C, when unit total load >=
When being 525 DEG C during 400MW and ＜ 600MW, when unit total load >=600MW is 603 DEG C, min (x)≤Ts≤max (x)；
8th step：Multiple Switching Logic Control of Reheat Steam Temperature logic 4 obtains the 1 of dynamic simulation environmental model 2 by I/O bitcoms 7 ...
N reheat steam temperature measured value；
9th step：Multiple Switching Logic Control of Reheat Steam Temperature logic 4 is by n reheat steam temperature measured value T1~TnAverage computation obtain
Reheat steam temperature measured value T；
10th step：Multiple Switching Logic Control of Reheat Steam Temperature logic 4 calculates the dynamic setting value T of reheat steam temperaturesWith reheat steam temperature measured value T
Deviation；
11st step：Multiple Switching Logic Control of Reheat Steam Temperature logic 4 exports flue gas by PID regulator ratio, integration, differential calculation
Recycle opening amount signal；
12nd step：Multiple Switching Logic Control of Reheat Steam Temperature logic 4 obtains the carbonated drink of dynamic simulation environmental model 2 by I/O bitcoms 7
Separator pressure measurement signal；
13rd step：Multiple Switching Logic Control of Reheat Steam Temperature logic 4 sets flue gas recirculation baffle opening and believed as boiler main fuel trip
Number occur when corresponding flue gas recirculation baffle opening definite value；
14th step：Multiple Switching Logic Control of Reheat Steam Temperature logic 4 sets flue gas recirculation baffle plate when recirculation blower stops and opened as 0%
Degree；
15th step：Multiple Switching Logic Control of Reheat Steam Temperature logic 4 exports the instruction of flue gas recirculation baffle opening, reaches adjustment flue gas again
Internal circulating load purpose；
16th step：Multiple Switching Logic Control of Reheat Steam Temperature logic 4 calculates burning by PID regulator ratio, integration, differential calculation
Device swash angle position；
17th step：Multiple Switching Logic Control of Reheat Steam Temperature logic 4 sets burner swash angle position and sent out as boiler main fuel trip signal
Steam-water separator pressure corresponding definite value when raw；
18th step：Multiple Switching Logic Control of Reheat Steam Temperature logic 4 exports the instruction of burner swash angle position, so as to reach adjustment burner hearth fire
The purpose of flame center；
19th step：Multiple Switching Logic Control of Reheat Steam Temperature logic 4 calculates n reheat steam temperature measured value T respectively1~TnWith reheat steam temperature
Dynamic setting value TSDeviation；
20th step：Multiple Switching Logic Control of Reheat Steam Temperature logic 4 calculates the average value of n reheat steam temperature deviation；
21st step：Multiple Switching Logic Control of Reheat Steam Temperature logic 4 is opened by PID regulator ratio, integration, differential calculation gas baffle
Degree；
22nd step：When boiler main fuel trip signal occurs, the multiple setting of Switching Logic Control of Reheat Steam Temperature logic 4 gas baffle is opened
Spend for 50%, that is, be maintained at centre position；
23rd step：Multiple Switching Logic Control of Reheat Steam Temperature logic 4 is calculated by partition function obtains 1~N grade low-temp reheaters flue gas is kept off
Plate opening degree instruction；
24th step：Flue gas recycled amount is calculated according to the instruction of flue gas recirculation baffle opening by dynamic simulation environmental model 2；
25th step：Furnace flame center is calculated according to burner swash angle position by dynamic simulation environmental model 2；
26th step：By dynamic simulation environmental model 2 according to 1~N grades of reheater gas baffle apertures, which are calculated, passes through 1~It is n grades low
Warm reheater exhaust gas volumn；
27th step：1~n times reheat steam temperature is calculated by dynamic simulation environmental model 2.
Embodiment：
Certain ultra supercritical double reheat power generation sets boiler is direct current this life stove, twice resuperheat.Steam turbine using superelevation/height/
Intermediate pressure cylinder combined launch mode, main steam is serial flow, i.e., main steam is by ultra-high pressure cylinder VHP entrance → steam discharge to one-level reheating
Device → entrance high pressure cylinder HP → high pressure cylinder HP steam discharges are to two grades of reheater → entrance intermediate pressure cylinder IP → low pressure (LP) cylinder LP → condensers, machine
Group carbonated drink general flow chart is shown in Fig. 2.According to unit process engineering ultra supercritical double reheat power generation sets Switching Logic Control of Reheat Steam Temperature logic,
By the multiple Switching Logic Control of Reheat Steam Temperature policy validation system of extra-supercritical unit, carry out unit starting, stopped process and dynamically imitate in real time
True experiment, according to the Different Effects of flue gas recirculation, burner pivot angle and gas baffle to first and second reheat steam temperature dynamic characteristic
Each PID regulator parameter is adjusted respectively, and the closed-loop control of flue gas recirculation, burner pivot angle and gas baffle is realized with this.It is logical
The heat distribution crossed between flue gas recirculation, burner pivot angle change superheater and reheater；Passed through by gas baffle adjustment
Exhaust gas volumn between I and II low pressure reheater, first and second reheat steam temperature deviation of control reaches setting value.Reheater water injection is only
Used during as reheat steam temperature accident condition, without using therefore not as the emphasis of checking during normal operation.In actual set fortune
Before the row debugging stage, the checking and optimization of Switching Logic Control of Reheat Steam Temperature logic are realized by this method, it is ensured that first and second reheat steam temperature control
Logic processed not only meets production needs but also can guarantee that equipment safety.
Claims (5)
1. a kind of multiple Switching Logic Control of Reheat Steam Temperature policy validation system of extra-supercritical unit, it is characterised in that：Including master computer
(1) it is in, the virtual controlling station computer (3) that I/O bitcoms (7) are connected with master computer (1), the master computer (1)
It is multiple Switching Logic Control of Reheat Steam Temperature logic (4), Virtual Controller in dynamic simulation environmental model (2), virtual controlling station computer (3)
VDCS (5) and man-machine interface (6)；I/O bitcoms (7) realize dynamic simulation environmental model (2) and virtual controlling station computer
(3) real-time data communication between；The master computer (1) obtains operating personnel from virtual controlling station computer (3) and passes through people
Tilting burner, flue gas recirculation, gas baffle and the instruction of spray desuperheating control operation that machine interface (6) is issued, and will calculate
As a result virtual controlling station computer (3) is fed back to, closed-loop control is formed, the result of calculation is opened including flue gas recirculation baffle plate
Degree, tilting burner angle, gas baffle aperture and desuperheat spray flow, n reheat steam temperature and unit real time execution simulation ginseng
Number.
2. the multiple Switching Logic Control of Reheat Steam Temperature policy validation system of a kind of extra-supercritical unit according to claim 1, its feature
It is：Master computer (1) is with dynamic simulation environmental model (2) for core, and dynamic simulation environmental model (2) is overall process dynamic analog
The multiple reheating embrittlement body process model of ultra supercritical of plan, realize to reference to unit from cold start to operating mode at full capacity, with
And from operating mode at full capacity to halted state overall process real time dynamic simulation.
3. the multiple Switching Logic Control of Reheat Steam Temperature policy validation system of a kind of extra-supercritical unit according to claim 1, its feature
It is：The dynamic simulation environmental model (2) uses larger fluid network algorithm, is meeting mass conservation law, the conservation of energy
On the premise of law, the law of conservation of momentum, it is ensured that integrality, accuracy and the real-time of the model based on Physical Mechanism；Truly
Energy conversion process and working medium in each physical process, including unit running process of simulation actual set is in not equality of temperature
Physical characteristic under degree and pressure.
4. a kind of verification method of the multiple Switching Logic Control of Reheat Steam Temperature policy validation system of extra-supercritical unit described in claim 1,
It is characterized in that：It is attached under the multiple Switching Logic Control of Reheat Steam Temperature logic (4) in Virtual Controller VDCS (5), content includes：Flue gas
Recycle baffle plate, tilting burner, gas baffle and spray desuperheating control；Comprise the following steps that：
1st step：Operating personnel set ultra supercritical reheating embrittlement total load by man-machine interface (6)；
2nd step：Multiple Switching Logic Control of Reheat Steam Temperature logic (4) obtains dynamic simulation environmental model (2) coal by I/O bitcoms (7)
Powder fineness, oxygen content measurement signal；
3rd step：Multiple Switching Logic Control of Reheat Steam Temperature logic (4) calculates correction factor C according to fineness of pulverized coal, oxygen amount1, C1=(1-0.02*
(R90-18)/18)*(3.35*(O2-O2 r)), wherein R90For fineness of pulverized coal, O2For burner hearth flue gas oxygen content, O2 rRepresent unit volume
Determine operating mode flue gas oxygen content, the O as unit load≤300MW2 rFor 5.56, O during unit load=500MW2 rFor 4.33, unit
O during load=750MW2 rFor 3.2, O during unit load=1000MW2 rFor 2.74；And to C1Progress upper lower limit value, 0.992≤
C1≤1.008；
4th step：Multiple Switching Logic Control of Reheat Steam Temperature logic (4) obtains dynamic simulation environmental model (2) 1 by I/O bitcoms (7) ...
N reheat pressure, temperature measurement signal；
5th step：Multiple Switching Logic Control of Reheat Steam Temperature logic (4) is according to 1...n reheat pressure, temperature computation correction factor C2；First calculate
The enthalpy h of corresponding temperature and pressuren﹦ f (Pn,Tn), C2﹦ k3((h1-h1 r)+(h2-h2 r)+┄+(hn-hn r)), to double reheat machine
Group n=2, wherein P are pressure, and T is temperature, and h is enthalpy；Coefficient k3Span 500~510；And to C2Carry out bound
Value, 0.988≤C2≤1.012；
6th step：Multiple Switching Logic Control of Reheat Steam Temperature logic (4) calculating reheat steam temperature initial set value X, X=C1*C2*f (x), wherein f
(x) determined according to unit total load, i.e., be 480 DEG C as unit total load ＜ 400MW, as unit total load >=400MW and ＜
When being 545 DEG C during 600MW, when unit total load >=600MW is 623 DEG C；
7th step：Multiple Switching Logic Control of Reheat Steam Temperature logic (4) carries out high-low limits calculating to reheat steam temperature initial set value X, obtains again
Hot vapour temperature dynamic setting value Ts, wherein higher limit max (x)：It it is 520 DEG C as unit total load ＜ 400MW, when unit total load
>=400MW is 628 DEG C；Lower limit min (x)：It it is 460 DEG C as unit total load ＜ 400MW, as unit total load >=400MW
When being 525 DEG C during with ＜ 600MW, when unit total load >=600MW is 603 DEG C, min (x)≤Ts≤max (x)；
8th step：Multiple Switching Logic Control of Reheat Steam Temperature logic (4) obtains dynamic simulation environmental model (2) 1 by I/O bitcoms (7) ...
N reheat steam temperature measured value；
9th step：Multiple Switching Logic Control of Reheat Steam Temperature logic (4) passes through to n reheat steam temperature measured value T1~TnAverage computation obtain again
Hot vapour temperature measurements T；
10th step：Multiple Switching Logic Control of Reheat Steam Temperature logic (4) calculates the dynamic setting value T of reheat steam temperaturesWith reheat steam temperature measured value T's
Deviation；
11st step：Multiple Switching Logic Control of Reheat Steam Temperature logic (4) is by PID regulator ratio, integration, differential calculation, and output flue gas is again
Circulate opening amount signal；
12nd step：Multiple Switching Logic Control of Reheat Steam Temperature logic (4) obtains dynamic simulation environmental model (2) vapour by I/O bitcoms (7)
Separator pressure measurement signal；
13rd step：Multiple Switching Logic Control of Reheat Steam Temperature logic (4) sets flue gas recirculation baffle opening as boiler main fuel trip signal
Corresponding flue gas recirculation baffle opening definite value during generation；
14th step：Multiple Switching Logic Control of Reheat Steam Temperature logic (4) sets flue gas recirculation baffle plate when recirculation blower stops and opened as 0%
Degree；
15th step：Multiple Switching Logic Control of Reheat Steam Temperature logic (4) output flue gas recirculation baffle opening instruction, reaches that adjustment flue gas is followed again
Circular rector purpose；
16th step：Multiple Switching Logic Control of Reheat Steam Temperature logic (4) calculates burner by PID regulator ratio, integration, differential calculation
Swash angle position；
17th step：Multiple Switching Logic Control of Reheat Steam Temperature logic (4) sets burner swash angle position to be occurred as boiler main fuel trip signal
When the corresponding definite value of steam-water separator pressure；
18th step：Multiple Switching Logic Control of Reheat Steam Temperature logic (4) output burner swash angle position instruction, so as to reach adjustment furnace flame
The purpose of center；
19th step：Multiple Switching Logic Control of Reheat Steam Temperature logic 4 calculates n reheat steam temperature measured value T respectively1~TnWith reheat steam temperature dynamic
Setting value TSDeviation；
20th step：Multiple Switching Logic Control of Reheat Steam Temperature logic (4) calculates the average value of n reheat steam temperature deviation；
21st step：Multiple Switching Logic Control of Reheat Steam Temperature logic (4) is opened by PID regulator ratio, integration, differential calculation gas baffle
Degree；
22nd step：When boiler main fuel trip signal occurs, multiple Switching Logic Control of Reheat Steam Temperature logic (4) sets gas baffle aperture
For 50%, that is, it is maintained at centre position；
23rd step：Multiple Switching Logic Control of Reheat Steam Temperature logic (4) is calculated by partition function obtains 1~N grade low-temp reheater gas baffles
Opening degree instruction；
24th step：Flue gas recycled amount is calculated according to the instruction of flue gas recirculation baffle opening by dynamic simulation environmental model (2)；
25th step：Furnace flame center is calculated according to burner swash angle position by dynamic simulation environmental model (2)；
26th step：By dynamic simulation environmental model (2) according to 1~N grades of reheater gas baffle apertures, which are calculated, passes through 1~N grade low-temps
Reheater exhaust gas volumn；
27th step：1~n times reheat steam temperature is calculated by dynamic simulation environmental model (2).
5. verification method according to claim 4, it is characterised in that：Increase in multiple Switching Logic Control of Reheat Steam Temperature logic (4)
Fineness of pulverized coal, flue gas oxygen content and n reheat pressure and steam temperature factor are repaiied to the dynamic setting value of multiple reheat steam temperature
Just, being reflected comprehensively with this influences the various factors of reheat steam temperature, realizes the high-quality control of reheat steam temperature；Not only it is applicable super face
Boundary's double reheat power generation sets Switching Logic Control of Reheat Steam Temperature policy validation and optimization, and it is applicable the extra-supercritical unit reheating of more stages reheating
Superheated Steam Temperature Control Strategy is verified and optimized.
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| CN106949457B (en) * | 2017-05-10 | 2022-09-23 | 西安西热控制技术有限公司 | Supercritical boiler platen superheater overtemperature control system and method |
| CN107420874B (en) * | 2017-08-16 | 2021-12-14 | 江苏大唐国际吕四港发电有限责任公司 | Ultra-supercritical thermal generator set coordination control system |
| CN107631286B (en) * | 2017-09-27 | 2019-04-19 | 哈尔滨锅炉厂有限责任公司 | A kind of method for regulating temperature and system improving ultra-supercritical boiler unit efficiency |
| CN108073160A (en) * | 2017-12-27 | 2018-05-25 | 中国大唐集团科学技术研究院有限公司西北分公司 | Thermoelectricity factory owner, the method for early warning of reheat steam temperature rapid decrease |
| CN108361683B (en) * | 2018-05-14 | 2023-12-22 | 华能国际电力股份有限公司海门电厂 | Full load section reheat temperature intelligent control system |
| CN108829057B (en) * | 2018-06-19 | 2020-07-03 | 华能太仓发电有限责任公司 | Boiler heating surface monitoring system and method based on different characteristic parameters and logic relations |
| CN108954293A (en) * | 2018-07-17 | 2018-12-07 | 中国大唐集团科学技术研究院有限公司华东分公司 | A kind of double reheat power generation sets Reheated-steam Temperature Control System and method that " graded combination " integrally controls |
| CN111365703A (en) * | 2020-03-23 | 2020-07-03 | 国电浙能宁东发电有限公司 | Reheat steam temperature composite control method based on humanoid intelligent control |
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| CN112221345B (en) * | 2020-09-25 | 2021-11-30 | 华能国际电力股份有限公司上海石洞口第二电厂 | Automatic control method for boiler flue gas baffle of ultra-supercritical generator set |
| CN112683732A (en) * | 2020-12-19 | 2021-04-20 | 西安西热控制技术有限公司 | Method for measuring density of desulfurized limestone slurry of thermal power plant |
| CN113391615B (en) * | 2021-05-10 | 2024-04-02 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Variable time pulse algorithm for probability statistics |
| CN113417707B (en) * | 2021-07-07 | 2024-05-31 | 中国能源建设集团广东省电力设计研究院有限公司 | Quick starting system of circulation combined unit |
| CN114063437B (en) * | 2021-10-22 | 2023-08-08 | 北京京能科技有限公司 | Control method for flue gas baffle of reheater of supercritical unit |
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| CN101619850B (en) * | 2009-08-06 | 2011-04-13 | 杭州盘古自动化系统有限公司 | Dispatching method and dispatching system based on load online forecasting of thermoelectric power system |
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