CN107218594B - Boiler Steam Temperature many reference amounts intelligence control system - Google Patents
Boiler Steam Temperature many reference amounts intelligence control system Download PDFInfo
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- CN107218594B CN107218594B CN201710455617.6A CN201710455617A CN107218594B CN 107218594 B CN107218594 B CN 107218594B CN 201710455617 A CN201710455617 A CN 201710455617A CN 107218594 B CN107218594 B CN 107218594B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G5/00—Controlling superheat temperature
- F22G5/12—Controlling superheat temperature by attemperating the superheated steam, e.g. by injected water sprays
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Abstract
The invention discloses a kind of Boiler Steam Temperature many reference amounts intelligence control systems, including water supply system and main steam system, the main steam system is provided with boiler drum, and the primary superheater set gradually in boiler drum output steam gas circuit, level-one attemperator, pendant superheater, second level attemperator, two-stage superheater and steam collecting container, pass through internal mode controller, attemperation control system, third interference module, internal model module and self-adaptive PID correction module influence each other and cooperate, realize the control to main steam temperature, stablize main steam temperature, reduce the cumulative departure of main steam temperature.The utility model has the advantages that main steam temperature is stablized, it is swift in response to interference signal, reduces the influence interfered to main steam, main steam accumulated error is small.
Description
Technical field
The present invention relates to thermal power generation boiler Main Steam Temperature Control technical field, specifically a kind of boiler main steam
Temperature many reference amounts intelligence control system.
Background technique
Boiler is most important as one of the three big important equipments (boiler, steam turbine, generator) during thermal power generation
Production equipment be the key that provide power for steam turbine in power plant's operational process.
In power generation process, main steam (also known as superheated steam) temperature of boiler superheater final stage outlet is boiler controller system
Important control parameter, the quality of Control platform directly affects the safety and economical operation of entire unit.Due to boiler of power plant
In the process of running, temperature has been approached superheater metal highest bearing temperature to superheater, and vapor (steam) temperature is excessively high to make superheater
Pipeline strength reduces, and service life is reduced, and 10~20 DEG C of long-term overtemperature operations, the service life will shorten half, and be in overtemperature for a long time
Under will cause superheater deformation and booster, influence its safety；Vapor (steam) temperature is too low, and entire unit thermal efficiency of cycle decreases,
Usual vapor (steam) temperature is every to reduce by 5~10 DEG C, and efficiency reduces about 1%.For steam turbine, excessively high main steam temperature be will cause
The thermal stress that steam turbine high-pressure cylinder turbine is subject to is excessive and damages；Too low main steam temperature can make several sections last by steam turbine
The humidity of blade steam increases, and causes blade wear.In addition, temperature fluctuation will lead to the metallic conduit and zero of boiler and steam turbine
Component generates metal fatigue, also results in the swollen difference variation of turbine cylinder and rotor, or even generates severe shocks, jeopardizes the peace of unit
Row for the national games.Therefore the final main steam temperature of superheater outlet must strictly control within the limits prescribed.It usually requires that not
- the 10 of overrate~+5 DEG C, long-play deviation fluctuation range are no more than ± 5 DEG C.The nominal operating temperature of main steam
Usually at 500 DEG C or more.
It will be seen from figure 1 that the main steam system includes sequentially connected pot comprising water supply system and main steam system
Furnace drum, primary superheater, level-one attemperator, pendant superheater, second level attemperator, two-stage superheater and steam collecting container.Two-stage
Attemperator is between two-stage superheater, the purpose is to guarantee vapor (steam) temperatures at different levels in the normal range, guarantees jet chimney not
It is damaged, and final main steam temperature parameter is made to reach the value of requirement.The saturated vapor come out from drum first passes through level-one mistake
Hot device finally exports to obtain required main steam from two-stage superheater using two-stage desuperheating device desuperheat.Subtracted by adjusting two-stage
The attemperation water flow of warm device realizes the independent control to each attemperator outlet steam temperature, and the desuperheating water of two-stage desuperheating device comes self-supporting
Jellyfish pipe.Since boiler vapor liquid level is controlled using the aperture for adjusting main feed valve, boiler feed pump is under power frequency state
Quantitative water supply can guarantee that water supply main pipe water pressure fluctuations are smaller under this mode, two-stage desuperheating device also small to the interference of attemperation water flow
Outlet steam temperature is able to satisfy control and requires, and keeps final main steam temperature deviation little, to realized indirectly to main steam
The control of temperature.But in this mode of operation, because the maximum quantity of steam that boiler generates is about 220t/h, every boiler feedwater
Pump power is about 1000kW, when main feed-regulating valve not standard-sized sheet, larger pressure difference can be generated before and after valve, lead to restriction loss too
Greatly.
For the requirement of response national energy-saving consumption reduction, now domestic many boilers are gradually carrying out variable frequency energy saving reforming, i.e., to
Feed pump increases frequency-converter device, then passes through main feed-regulating valve standard-sized sheet according to level imbalance by detecting liquid level of steam drum
Frequency converter automatic adjustment water supply pump frequency control confluent is to control liquid level of steam drum.But this improved method of operation is brought
New problem, in adjustment process, main pipe hydraulic pressure can fluctuate with the variation of Boiler Steam amount, the interference of desuperheat water valve flow
Also it can become larger therewith, each attemperator outlet steam temperature control precision is caused to be deteriorated.Not due to current this control mode
Have and required main steam temperature is directly brought into control system, control section vapor (steam) temperature deviation accumulation each in this way will ultimately result in
It exports main steam temperature and deviates required temperature value.
In real process, each control section is using simple regulatory PID control, when main steam temperature deviates required temperature
When being worth range, by the value of the final main steam temperature of artificial observation, by each attemperator outlet vapor temperature of manually setting stepwise
The controlling value of degree, to indirectly control final main steam temperature, therefore the requirements for the operators are very high, not only needs phase abundant
Professional knowledge is closed, but also it is horizontal to have skilled manipulation, if control is not in time, it is also difficult in a short time by main steaming
Stripping temperature is stablized within the scope of required temperature, it is clear that this control mode is difficult to reach the accurate control to main steam temperature.
By consulting relative literature data, at present using this control mode, i.e., domestic Boiler Steam Temperature is substantially
Present control mode is not able to satisfy the requirement accurately automatically controlled.
Since there is also controlled device inertia and retardance is larger and steam stream during Boiler Steam Temperature Control
Various interference effects, these factor collective effects such as amount, flue gas heat, attemperation water flow fluctuation are more reduced to main steam temperature
The controllability index of degree.Based on above system and defect, but cannot the structure to the system carry out big variation, can not be to boiler
Drum and level-one attemperator, second level attemperator carry out independent water supply, and Boiler Steam Temperature Control defect is unable to get change.
To ensure that the control of main steam temperature reaches safety and stability, it is more and more important that automation control is carried out to it.For
How this, realize the stabilization of main steam temperature in steam production process, and improving Main Steam Temperature Control quality has important show
Sincere justice and practical value.
Summary of the invention
In view of the above-mentioned problems, being controlled fast the present invention provides a kind of Boiler Steam Temperature many reference amounts intelligence control system
Speed, main steam temperature are stablized, and temperature error is small, high reliablity.
In order to achieve the above objectives, the specific technical solution that the present invention uses is as follows:
A kind of Boiler Steam Temperature many reference amounts intelligence control system, including water supply system and main steam system, the master
Vapour system is provided with the primary superheater set gradually in boiler drum and boiler drum output steam gas circuit, level-one subtracts
Warm device, pendant superheater, second level attemperator, two-stage superheater and steam collecting container, in the steam outlet of the level-one attemperator
Place is provided with the first temperature monitoring, and second temperature monitor, institute are provided at the steam outlet of the second level attemperator
It states two-stage superheater steam outlet and is provided with third temperature monitoring, the water supply system includes water tank, in the water tank
Water is transported to the boiler drum through water supply pump, and the water in the water tank is also defeated through water supply pump, level-one attemperation water flow valve
It is sent to level-one attemperator, the water in the water tank is also transported to the second level desuperheat through water supply pump, second level attemperation water flow valve
Device, key are:
The main steam system is additionally provided with main steam control system, and the main steam control system includes internal model control
Device, attemperation control module, third interference module and internal model module；The internal mode controller obtains the first difference signal Δ T1
And export Main Steam Temperature Control signal T1；The attemperation control module is according to the Main Steam Temperature Control signal T1It is right step by step
The level-one attemperator, second level attemperator desuperheating process controlled, to change two-stage superheater output steam
Secondary superheater steam temperature value t3；The third interference module acquisition third interferes driving signal D0And export third interference signal
G, the third interference signal g and the secondary superheater steam temperature value t3The main steam actual temperature signal T is obtained after making difference0；
The internal model module obtains the Main Steam Temperature Control signal T1And output tracking temperature signal T0'；The main steam is real
Border temperature signal T0With the tracking temperature signal T0' make difference after obtain the second difference signal Δ T2, the second difference signal Δ T2
The first difference signal Δ T is obtained after making difference with main steam set temperature signal T1。
By above-mentioned design, final main steam temperature is directly controlled in order to realize, is obtained in it by the Fitting Calculation
Portion's model reduces the purely retarded due to being formed in main steam temperature transmission process to the shadow of control effect according to internal model control principle
It rings, keeps temperature governing response more timely.Reduce the influence of time lag in control process, above scheme uses internal model control in major loop
Final main steam temperature is included in control system by mode processed, is stablized to main steam temperature.And main steam temperature is carried out
Interference control, improves main steam temperature stability.Accumulated error is small, and control is reliable, strong robustness.
Further, the third interferes driving signal D0For the steam flow signal for flowing through the boiler drum output.
Using the above scheme, main steam temperature has been directly brought into control system using outer ring major loop, has been reduced each
Deviation accumulation in the case of control section independent control.Main steam temperature is directly controlled by outer ring major loop.
Further describing, the attemperation control module includes the first attemperation control module and the second attemperation control module,
The first attemperation control module obtains the Main Steam Temperature Control signal T1, and to the desuperheating process of the level-one attemperator
It is controlled, to change the first desuperheat temperature value t of the level-one attemperator output steam1, the first attemperation control mould
Block is also according to the first desuperheat temperature value t1Generate the first desuperheated system temperature signal T3；The second attemperation control module obtains institute
State the first desuperheated system temperature signal T3, and the desuperheating process of the second level attemperator is controlled, to change described two
Second desuperheat temperature value t of grade attemperator output steam2, and then change the secondary superheater steam temperature value t3, described second subtracts
Warm control module is also according to the secondary superheater steam temperature value t3Generate the main steam actual temperature signal T0。
By above-mentioned design, it is controlled the control to level-one attemperator, second level attemperator as individual control system
System, is respectively intended to fast and stable two-stage desuperheating device outlet steam temperature, the vapor (steam) temperature setting value of second level attemperator is subtracted by level-one
The vapor (steam) temperature of warm device output is given, and level-one attemperator desired temperature is servo-actuated given by master controller.Accumulated error is small, control
Reliably.
It further describes, the first attemperation control module includes the first attemperation control device, the first compensating module and the
One interference module, the first attemperation control device obtain third difference signal Δ T3And the first attemperation control signal a is exported, it is described
Level-one attemperation water flow valve changes valve opening according to the first attemperation control signal a, to change level-one desuperheat water flow
Amount, and then change the first desuperheat temperature value t of the first temperature monitoring acquisition1；First interference module obtains
First interference driving signal, and export the first interference signal d, the first steam monitoring temperature and the first interference signal d
The first desuperheated system temperature signal T is obtained after making difference3；First compensating module obtains the first compensation driving signal, and
Export the first thermal compensation signal c, the Main Steam Temperature Control signal T1With the first desuperheated system temperature signal T3, first mend
It repays after signal c successively makees difference and obtains the third difference signal Δ T3。
Using the above scheme, when the first interference signal d and the first thermal compensation signal c acts on level-one attemperator, first subtracts
Temperature controller is reacted rapidly, and internal mode controller, the second attemperation control module also make corresponding response, so that two-stage
Attemperator outlet steam temperature fast and stable is in same temperature.Level-one attemperator desuperheating process is weakened to the shadow of main steam temperature
It rings.
It further describes, the first interference driving signal or defeated for level-one attemperator steam described in the two neighboring moment
The steam flow signal difference of outlet, or it is poor for the water flow signal that the two neighboring moment flows through the level-one attemperation water flow valve
Value；The first compensation driving signal or the steam flow signal for level-one attemperator steam outlet described in the two neighboring moment
Difference, or flow through for the two neighboring moment water flow signal difference of the level-one attemperation water flow valve.
Using the above scheme, for different actual conditions, the water flow signal for flowing through level-one attemperation water flow valve is avoided
The steam flow signal difference of difference or level-one attemperator steam outlet is fluctuated caused by desuperheating process, when there are water flows
When measuring difference or quantity of steam difference, compensation and interference appropriate are carried out to the desuperheating process of level-one attemperator, enhancing level-one subtracts
The attemperation control stability of warm device.
It further describes, the second attemperation control system includes the second attemperation control device, the second compensating module and the
Two interference modules, the second attemperation control device obtain the 4th difference signal Δ T4And the second attemperation control signal b is exported, it is described
Second level attemperation water flow valve according to the second attemperation control signal b come control valve aperture, to change second level desuperheat water flow
Amount, and then change the second desuperheat temperature value t of the second temperature monitor acquisition2；Second interference module obtains
Second interference driving signal, and export the second interference signal f, the second desuperheat temperature value t2With the second interference signal f
The second desuperheated system temperature signal T is obtained after making difference4；Second compensating module obtains the second compensation driving signal, and
Export the second thermal compensation signal h, the first desuperheated system temperature signal T3With the second desuperheated system temperature signal T4, second
Thermal compensation signal h obtains the 4th difference signal Δ T after successively making difference4。
When the second interference signal f and the second thermal compensation signal h acts on second level attemperator, the second attemperation control device is made rapidly
It reacts out, and internal mode controller, the first attemperation control device also make corresponding response, so that two-stage desuperheating device outlet vapor temperature
Fast and stable is spent in same temperature.Weaken influence of the second level attemperator attemperation control process to main steam temperature.
It further describes, the second interference driving signal or defeated for second level attemperator steam described in the two neighboring moment
The steam flow signal difference of outlet, or it is poor for the water flow signal that the two neighboring moment flows through the second level attemperation water flow valve
Value；The second compensation driving signal or the steam flow signal for second level attemperator steam outlet described in the two neighboring moment
Difference, or flow through for the two neighboring moment water flow signal difference of the second level attemperation water flow valve.
For different actual conditions, the water flow signal difference for flowing through second level attemperation water flow valve or second level is avoided to subtract
The steam flow signal difference of warm device steam outlet is fluctuated caused by desuperheating process, when there are water flow difference or steam
When measuring difference, compensation and interference appropriate are carried out to the desuperheating process of second level attemperator, enhance the attemperation control of second level attemperator
Stability.
It further describes, the main steam system is additionally provided with self-adaptive PID correction module, and the self-adaptive PID is repaired
Positive module is with input temp deviation e and deviation variation rate ecAs input, the self-adaptive PID controller output parameter increment letter
Number Δ k is to the internal mode controller；
The input temp deviation e is the main steam set temperature signal T and main steam actual temperature signal T0
Difference；The deviation variation rate
By above-mentioned design, the online real-time amendment of major loop controller parameter is realized.It is online by introducing fuzzy intelligence
Amending unit analyzes main steam temperature deviation, when the variation of unit operating condition makes main steam temperature deviate setting value model
When enclosing, corresponding controller parameter correction value is provided by fuzzy intelligence on-line amending unit, and with the original base of master controller
New controller dynamic setting value is obtained after the superposition of this pre-set parameter, to realize the dynamic corrections to controller parameter.Through
Controller after crossing parameters revision is according to exporting suitable control amount to executing agency, with this to main steam after input deviation operation
Temperature is controlled, and so as to improve conventional control mode when operating condition changes, fixed controller parameter cannot be controlled preferably
The shortcomings that main steam temperature, has system and preferably adapts to regulating power.
Beneficial effects of the present invention:
Using two-step evolution, using the control to level-one attemperator, second level attemperator as two single inner loop control circuits, respectively
For fast and stable two-stage desuperheating device outlet steam temperature, the vapor (steam) temperature setting value of second level attemperator is exported by level-one attemperator
Vapor (steam) temperature is given, and level-one attemperator desired temperature is servo-actuated given by internal mode controller.Attemperation water flow wave can quickly be eliminated
It is dynamic that main steam temperature caused by disturbing factors is waited to fluctuate, make system fast and stable.It ensure that two control section direct-contact desuperheaters are effective
Cooperation.
Main steam temperature has been directly brought into control system by outer ring major loop, has reduced each control section independent control
In the case of deviation accumulation.
Major loop uses internal model control mode, and two single inner ring circuits are equivalent to the controlled device of broad sense, are counted by fitting
Calculation obtains its internal model, is reduced according to internal model control principle since the purely retarded formed in main steam temperature transmission process is to control
The influence of effect processed keeps temperature governing response more timely.
Realize the online real-time amendment of major loop controller parameter.By introducing self-adaptive PID on-line amending module, to master
Vapor (steam) temperature deviation is analyzed, when the variation of unit operating condition makes main steam temperature deviate range of set value, by adaptive
It answers PID on-line amending module to provide corresponding controller parameter correction value, and is set with the original basic parameter of internal mode controller
New controller dynamic setting value is obtained after value superposition, to realize the dynamic corrections to controller parameter.By parameters revision
Controller afterwards controls main steam temperature with this according to suitable control amount is exported after input deviation operation to executing agency
System, so as to improve conventional control mode when operating condition changes, fixed controller parameter cannot preferably control main steam temperature
The shortcomings that, there is system and preferably adapt to regulating power.
Detailed description of the invention
Fig. 1 is single seat coal-burning boiler main steam production technology schematic diagram of the invention；
Fig. 2 is that main steam of the invention generates process flow chart；
Fig. 3 is internal model control system block diagram of the invention；
Fig. 4 is internal model control principle figure of the present invention；
Fig. 5 is internal model control equivalent structure figure of the present invention；
Fig. 6 is the double single inner ring cascade control system block diagrams of Boiler Steam Temperature of the invention.
Fig. 7 is self-adaptive PID correction module composition block diagram of the present invention.
Specific embodiment
Specific embodiment and working principle of the present invention will be described in further detail with reference to the accompanying drawing.
It can be seen that a kind of Boiler Steam Temperature many reference amounts intelligence control system, including water supply system from Fig. 1 and Fig. 2
And main steam system, the main steam system are provided in boiler drum and boiler drum output steam gas circuit and set gradually
Primary superheater, level-one attemperator, pendant superheater, second level attemperator, two-stage superheater and steam collecting container.
It is seen also in fig. l that it is provided with the first temperature monitoring at the steam outlet of the level-one attemperator,
Second temperature monitor, the two-stage superheater steam outlet setting are provided at the steam outlet of the second level attemperator
There is third temperature monitoring, the water supply system includes water tank, and the water in the water tank is transported to the boiler through water supply pump
Drum, water in the water tank are also transported to level-one attemperator through water supply pump, level-one attemperation water flow valve, in the water tank
Water is also transported to the second level attemperator through water supply pump, second level attemperation water flow valve.
Preferably, the first steam-flow meter is provided at boiler drum steam outlet.In the steam of level-one attemperator
Equipped at outlet port is provided with the second steam-flow meter.Third steam-flow meter is provided at the steam outlet of second level attemperator.
Preferably, the first attemperation water flow meter is provided on the desuperheat waterpipe of level-one attemperator.In second level attemperator
Desuperheat waterpipe on be provided with the second attemperation water flow meter.
From figure 3, it can be seen that the main steam system is additionally provided with main steam control system, the main steam control system
Including internal mode controller, attemperation control module, third interference module and internal model module；The internal mode controller obtains first
Difference signal Δ T1And export Main Steam Temperature Control signal T1；The attemperation control module is according to the Main Steam Temperature Control
Signal T1The desuperheating process of the level-one attemperator, second level attemperator is controlled step by step, to change the secondary superheater
The secondary superheater steam temperature value t of device output steam3；The third interference module acquisition third interferes driving signal D0And it exports
Third interference signal g, the third interference signal g and the secondary superheater steam temperature value t3The main steam reality is obtained after making difference
Border temperature signal T0；The internal model module obtains the Main Steam Temperature Control signal T1And output tracking temperature signal
T0'；The main steam actual temperature signal T0With the tracking temperature signal T0' make difference after obtain the second difference signal Δ T2, should
Second difference signal Δ T2The first difference signal Δ T is obtained after making difference with main steam set temperature signal T1。
Wherein, Fig. 4 is made equivalent transformation by the internal model control principle according to Fig. 4, obtains equivalent structure figure.It is detailed in Fig. 5.
Closed-loop system has:
If Model Matching, i.e. Gp(s)=Gm(s) when, formula (1) can simplify are as follows:
Y (s)=Gc(s)Gp(s)R(s)+[1-Gc(s)Gm(s)]Gd(s)D(s) (2)
At this time if metThen have:
Formula (3) shows that internal mode controller can be realized the zero deflection tracking to reference input.However preferable controller is special
Property beIn the presence of and controller Gc(s) it is obtained under conditions of may be implemented.However due to time lag in control process and it is used to
The presence of property link,In pure advanced and pure differential link will occur, therefore the internal mode controller of routine can be as follows
Design:
1) by Gm(s) it is divided into two, it may be assumed that
Gm(s)=Gm+(s)Gm-(s) (4)
Wherein: Gm+It (s) is the part for including purely retarded and unstable zero point, G in modelm-It (s) is the minimum phase in model
Bit position.
2) internal mode controller is sought:
Gc(s)=f (s)/Gm-(s) (5)
F (s) is low-pass filter in formula, and form is
Wherein λ filtering parameter is that internal mode controller only has design parameter.
Consider the design of time lag of first order process Internal Model PID Controller
Controlled device transfer function model:
Take filter are as follows:
Internal mode controller can be obtained by formula (5) are as follows:
Corresponding feedback controller are as follows:
There is the form of PID controller for formula (10), with single order Taylor series approximation time lag item
e-τs=1- τ s (11)
Therefore it is as follows to obtain Internal Model PID Controller form:
Obvious formula (12) has the form of PI controller.
In the present embodiment, attemperation control module include the first attemperation control module and the second attemperation control module, first
Attemperation control module includes the first attemperation control device, the first compensating module and the first interference module, the first attemperation control device
Obtain third difference signal Δ T3And the first attemperation control signal a is exported, the level-one attemperation water flow valve is according to described first
Attemperation control signal a changes valve opening, to change level-one attemperation water flow, and then changes first temperature monitoring
The first desuperheat temperature value t of acquisition1；First interference module obtains the first interference driving signal, and it is dry to export first
Signal d is disturbed, the first steam monitoring temperature and the first interference signal d obtain the first desuperheated system temperature after making difference
Signal T3；First compensating module obtains the first compensation driving signal, and exports the first thermal compensation signal c, the main steam temperature
Degree control signal T1With the first desuperheated system temperature signal T3, that the first thermal compensation signal c successively makees to obtain the third after difference is poor
Value signal Δ T3.Wherein Main Steam Temperature Control signal T1As minuend, the first desuperheated system temperature signal T3, first compensation
Signal c is as subtrahend.
The second attemperation control system includes the second attemperation control device, the second compensating module and the second interference module, institute
It states the second attemperation control device and obtains the 4th difference signal Δ T4And export the second attemperation control signal b, the second level desuperheat water flow
Valve is measured according to the second attemperation control signal b come control valve aperture, to change second level attemperation water flow, and then changes institute
State the second desuperheat temperature value t of second temperature monitor acquisition2；Second interference module obtains the second interference driving letter
Number, and export the second interference signal f, the second desuperheat temperature value t2Described in being obtained after the second interference signal f work difference
Second desuperheated system temperature signal T4；Second compensating module obtains the second compensation driving signal, and exports the second compensation letter
Number h, the first desuperheated system temperature signal T3With the second desuperheated system temperature signal T4, the second thermal compensation signal h successively makees
The 4th difference signal Δ T is obtained after difference4.Wherein the first desuperheated system temperature signal T3As minuend, the second desuperheated system
Temperature signal T4, the second thermal compensation signal h is as subtrahend.
In the present embodiment, the first interference driving signal is level-one attemperator steam outlet described in the two neighboring moment
Steam flow signal difference Δ D1。
In the present embodiment, the first compensation driving signal is the output of level-one attemperator steam described in the two neighboring moment
The steam flow signal difference Δ D of mouth1。
Wherein, the steam flow signal difference Δ D of level-one attemperator steam outlet1=D1i-D1(i-1), wherein D1iFor when
Carve tiLevel-one attemperator steam outlet steam flow signal, D1(i-1)For moment ti-1Level-one attemperator steam outlet
Steam flow signal.
In the present embodiment, the second interference driving signal is second level attemperator steam outlet described in the two neighboring moment
Steam flow signal difference Δ D2。
In the present embodiment, the second compensation driving signal or defeated for second level attemperator steam described in the two neighboring moment
The steam flow signal difference Δ D of outlet2。
The steam flow signal difference Δ D of second level attemperator steam outlet described in the two neighboring moment2=D2i-D2(i-1),
Wherein D2iFor moment tiLevel-one attemperator steam outlet steam flow signal, D2(i-1)For moment ti-1Level-one attemperator
The steam flow signal of steam outlet.
In the present embodiment, third interferes driving signal D0For the steam flow signal for flowing through the boiler drum output.
From fig. 6, it can be seen that the main steam system is additionally provided with self-adaptive PID correction module, the self-adaptive PID is repaired
Positive module is with input temp deviation e and deviation variation rate ecAs input, the self-adaptive PID controller output parameter increment letter
Number Δ k is to the internal mode controller；
The input temp deviation e is the main steam set temperature signal T and main steam actual temperature signal T0
Difference；The deviation variation rate
From fig. 6, it can be seen that the working principle of self-adaptive PID on-line amending module is: first according to the warp of operator
Formulation inference rule is tested, after then inputting vapor (steam) temperature deviation signal Fuzzy processing, in fuzzy intelligence on-line amending unit
It is middle to calculate the corresponding result of decision according to the rule-based reasoning, and repaired required parameter is obtained after the processing such as the result anti fuzzy method
Positive value, the i.e. parameter correction values of major loop Internal Model PID Controller are made after being superimposed the correction value with Internal Model PID basic settings value
For the new dynamic setting value of Internal Model PID, to complete the on-line amending to controller parameter.The expression formula of parameters revision is as follows
kp=k 'p+Δkp
ki=k '1+Δki
kd=k 'd+Δkd
K ' in formulap、k′i、k′dFor controller basic settings value, Δ kp、Δki、ΔkdFor correction value, kp、ki、kdFor amendment
Controller dynamic setting value afterwards.
Wherein, the inference rule of this programme design is:
1) when E is NB and EC is also NB, i.e., deviation is negative big and has the tendency that continuing bigger than normal, actual measurement main steam temperature height
In 540 DEG C of setting value and deviation continues to increase, and to eliminate the trend for having negative large deviation and becoming larger as early as possible, needs to increase controller
The parameter value of ratio P, to prevent integral saturation from need to reduce the value of integral I, to avoid excessive overshoot, differential D takes smaller value or zero,
That is Δ Kp is PB, and Δ Ki is NB, and Δ Kd is PS, so that controller parameter is in control requirement, so that main steam temperature
Fast and stable.
2) when E is ZO and EC is NS, i.e., deviation is zero and has increase tendency, and actual measurement main steam temperature is equal to setting value
540 DEG C but on the rise, the value that should increase controller P at this time improves response speed, and the appropriate value for reducing integral I improves system
Stability, differentiation element take appropriate value to reduce oscillation when stablizing, i.e. Δ Kp is PS, and Δ Ki is NS, and Δ Kd is NS.
3) when E is PB and EC is also PB, i.e., deviation is honest and has increase tendency, and actual measurement main steam temperature is lower than setting
540 DEG C of value and has and continue reduction trend.To eliminate existing positive large deviation and inhibiting being further enlarged for deviation, control need to be reduced
The value of device P, and increase the value of controller integral and differential, so that system is obtained preferable steady-state performance, i.e. Δ Kp is NB, and Δ Ki is
PB, Δ Kd are PB.
Various situations are analyzed one by one, the fuzzy reasoning table of controller parameter fuzzy intelligence on-line amending unit can be obtained, such as
Shown in the following table 1~3:
1 Δ K of tablepFuzzy reasoning table
2 Δ K of tableiFuzzy reasoning table
3 Δ K of tabledFuzzy reasoning table
In the present solution, e and ec is input temp deviation and deviation variation rate, E and EC are the temperature after Fuzzy processing
Deviation and deviation variation rate.NB (negative big, Negative Big), NM (in negative, Negative Medium), NS (it is bear small,
Negative Small), ZO (zero, Zero), PS (just small, Postive Small), PM (center, Postive Medium), PB
(honest, Postive Big).
It should be pointed out that the above description is not a limitation of the present invention, the present invention is also not limited to the example above,
Variation, modification, addition or the replacement that those skilled in the art are made within the essential scope of the present invention, are also answered
It belongs to the scope of protection of the present invention.
Claims (8)
1. a kind of Boiler Steam Temperature many reference amounts intelligence control system, including water supply system and main steam system, the main steaming
Vapour system is provided with primary superheater, the level-one desuperheat set gradually in boiler drum and boiler drum output steam gas circuit
Device, pendant superheater, second level attemperator, two-stage superheater and steam collecting container, at the steam outlet of the level-one attemperator
It is provided with the first temperature monitoring, second temperature monitor is provided at the steam outlet of the second level attemperator, it is described
Two-stage superheater steam outlet is provided with third temperature monitoring, and the water supply system includes water tank, the water in the water tank
It is transported to the boiler drum through water supply pump, the water in the water tank is also conveyed through water supply pump, level-one attemperation water flow valve
To level-one attemperator, the water in the water tank is also transported to the second level attemperator through water supply pump, second level attemperation water flow valve,
It is characterized by:
The main steam system is additionally provided with main steam control system, and the main steam control system includes internal mode controller, subtracts
Warm control module, third interference module and internal model module；
The internal mode controller obtains the first difference signal Δ T1And export Main Steam Temperature Control signal T1；
The attemperation control module is according to the Main Steam Temperature Control signal T1Step by step to the level-one attemperator, second level desuperheat
The desuperheating process of device is controlled, to change the secondary superheater steam temperature value t of the two-stage superheater output steam3；
The third interference module acquisition third interferes driving signal D0And third interference signal g is exported, third interference signal g
With the secondary superheater steam temperature value t3The main steam actual temperature signal T is obtained after making difference0；
The internal model module obtains the Main Steam Temperature Control signal T1And output tracking temperature signal T0'；The main steaming
Vapour actual temperature signal T0With the tracking temperature signal T0' make difference after obtain the second difference signal Δ T2, second difference signal
ΔT2The first difference signal Δ T is obtained after making difference with main steam set temperature signal T1。
2. Boiler Steam Temperature many reference amounts intelligence control system according to claim 1, it is characterised in that: the third
Interfere driving signal D0For the steam flow signal for flowing through the boiler drum output.
3. Boiler Steam Temperature many reference amounts intelligence control system according to claim 1 or 2, it is characterised in that: described
Attemperation control module includes the first attemperation control module and the second attemperation control module, and the first attemperation control module obtains institute
State Main Steam Temperature Control signal T1, and the desuperheating process of the level-one attemperator is controlled, to change the level-one
First desuperheat temperature value t of attemperator output steam1, the first attemperation control module is also according to the first desuperheat temperature value t1It is raw
At the first desuperheated system temperature signal T3；
The second attemperation control module obtains the first desuperheated system temperature signal T3, and the second level attemperator is subtracted
Warm process is controlled, to change the second desuperheat temperature value t of the second level attemperator output steam2, and then described in change
Secondary superheater steam temperature value t3, the second attemperation control module is also according to the secondary superheater steam temperature value t3Generate institute
State main steam actual temperature signal T0。
4. Boiler Steam Temperature many reference amounts intelligence control system according to claim 3, it is characterised in that: described first
Attemperation control module includes the first attemperation control device, the first compensating module and the first interference module, the first attemperation control device
Obtain third difference signal Δ T3And the first attemperation control signal a is exported, the level-one attemperation water flow valve is according to described first
Attemperation control signal a changes valve opening, to change level-one attemperation water flow, and then changes first temperature monitoring
The first desuperheat temperature value t of acquisition1；
First interference module obtains the first interference driving signal, and exports the first interference signal d, the first steam monitoring
Temperature and the first interference signal d obtain the first desuperheated system temperature signal T after making difference3；
First compensating module obtains the first compensation driving signal, and exports the first thermal compensation signal c, the main steam temperature control
Signal T processed1With the first desuperheated system temperature signal T3, the first thermal compensation signal c successively makees to obtain the third difference letter after difference
Number Δ T3。
5. Boiler Steam Temperature many reference amounts intelligence control system according to claim 4, it is characterised in that: described first
Driving signal or the steam flow signal difference for level-one attemperator steam outlet described in the two neighboring moment are interfered, or is phase
Adjacent two moment flow through the water flow signal difference of the level-one attemperation water flow valve；
The first compensation driving signal is believed for the steam flow of level-one attemperator steam outlet described in the two neighboring moment
Number difference, or flow through for the two neighboring moment water flow signal difference of the level-one attemperation water flow valve.
6. Boiler Steam Temperature many reference amounts intelligence control system according to claim 4, it is characterised in that: described second
Attemperation control system includes the second attemperation control device, the second compensating module and the second interference module, the second attemperation control device
Obtain the 4th difference signal Δ T4And the second attemperation control signal b is exported, the second level attemperation water flow valve is according to described second
Attemperation control signal b carrys out control valve aperture, to change second level attemperation water flow, and then changes the second temperature monitor
The second desuperheat temperature value t of acquisition2；
Second interference module obtains the second interference driving signal, and exports the second interference signal f, the second desuperheat temperature
Value t2The second desuperheated system temperature signal T is obtained after making difference with the second interference signal f4；
Second compensating module obtains the second compensation driving signal, and exports the second thermal compensation signal h, first desuperheated system
Temperature signal T3With the second desuperheated system temperature signal T4, the second thermal compensation signal h obtain the 4th difference after successively making difference
Signal delta T4。
7. Boiler Steam Temperature many reference amounts intelligence control system according to claim 6, it is characterised in that: described second
Driving signal or the steam flow signal difference for second level attemperator steam outlet described in the two neighboring moment are interfered, or is phase
Adjacent two moment flow through the water flow signal difference of the second level attemperation water flow valve；
The second compensation driving signal is believed for the steam flow of second level attemperator steam outlet described in the two neighboring moment
Number difference, or flow through for the two neighboring moment water flow signal difference of the second level attemperation water flow valve.
8. Boiler Steam Temperature many reference amounts intelligence control system according to claim 2, it is characterised in that: the main steaming
Vapour system is additionally provided with self-adaptive PID correction module, and the self-adaptive PID correction module is become with input temp deviation e and deviation
Rate ecAs input, the self-adaptive PID controller output parameter increment signal Δ k to the internal mode controller；
The input temp deviation e is the main steam set temperature signal T and main steam actual temperature signal T0Difference
Value；The deviation variation rate
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| CN108386829B (en) * | 2018-03-01 | 2019-06-11 | 北京德普新源科技发展有限公司 | A kind of temprature control method of boiler overheating steam, device and system |
| CN108954294B (en) * | 2018-05-22 | 2019-09-24 | 哈尔滨工业大学 | Overheater of power generating set/reheater steam temperature feed forward control method |
| CN109917640B (en) * | 2019-03-21 | 2022-03-18 | 厦门理工学院 | PID control method, device and equipment for air inlet temperature internal model of spray drying tower |
| CN111123770B (en) * | 2019-12-13 | 2021-09-24 | 山东中实易通集团有限公司 | Method and device for determining opening of bypass model under FCB working condition |
| CN111181467B (en) * | 2020-01-15 | 2021-09-24 | 武汉理工大学 | Servo motor rotating speed adjusting method and system based on three-dimensional fuzzy control |
| CN111832167A (en) * | 2020-07-09 | 2020-10-27 | 许昌开普检测研究院股份有限公司 | Temperature and pressure reducer modeling method applied to steam system simulation and temperature and pressure reducer |
| CN113238589B (en) * | 2021-04-25 | 2022-02-11 | 东南大学 | Method for setting parameters of superheated steam temperature load feedforward controller |
| CN113189861B (en) * | 2021-04-27 | 2022-09-27 | 国能南京电力试验研究有限公司 | Design method of main steam temperature control system equivalent to post-desuperheater temperature control |
| CN113531510B (en) * | 2021-06-18 | 2023-03-31 | 杭州电子科技大学 | Power station boiler main steam temperature control method |
| CN113883492B (en) * | 2021-09-06 | 2024-02-09 | 国能河北沧东发电有限责任公司 | Boiler steam temperature control method and electronic equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007187340A (en) * | 2006-01-11 | 2007-07-26 | Nippon Steel Engineering Co Ltd | Boiler main steam temperature control method for waste treatment facility |
| CN104483930A (en) * | 2014-11-21 | 2015-04-01 | 大唐淮南洛河发电厂 | Advanced process control optimizing system of thermal power unit |
| CN104776416B (en) * | 2015-04-13 | 2017-01-04 | 河南华润电力古城有限公司 | Dum boiler Stream temperature degree control method and system |
-
2017
- 2017-06-16 CN CN201710455617.6A patent/CN107218594B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007187340A (en) * | 2006-01-11 | 2007-07-26 | Nippon Steel Engineering Co Ltd | Boiler main steam temperature control method for waste treatment facility |
| CN104483930A (en) * | 2014-11-21 | 2015-04-01 | 大唐淮南洛河发电厂 | Advanced process control optimizing system of thermal power unit |
| CN104776416B (en) * | 2015-04-13 | 2017-01-04 | 河南华润电力古城有限公司 | Dum boiler Stream temperature degree control method and system |
Non-Patent Citations (2)
| Title |
|---|
| 一种改进的锅炉主蒸汽温度多级智能控制***的应用研究;左为恒 等;《化工自动化及仪表》;20170731;第44卷(第7期);第662-666页 |
| 基于IMC和两级减温器相互配合控制的过热汽温控制方案;刘志超 等;《仪表技术与传感器》;20150630(第6期);第56-58,65页 |
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