CN107561941A - A kind of full working scope qualified discharge control method of fired power generating unit denitrating system - Google Patents
A kind of full working scope qualified discharge control method of fired power generating unit denitrating system Download PDFInfo
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Abstract
A kind of full working scope qualified discharge control method of fired power generating unit denitrating system, methods described sets main ring PID controller, inner loop PID controller and feedforward controller in denitration control system, and main ring PID controller calculates ammonia spraying amount control signal according to exit NOx concentration setting value and exit NOx concentration feedback signal；Feedforward controller calculates ammonia spraying amount feed-forward control signals according to purging correction NOx concentration, NOx predicted concentrations, inlet NOx concentration and flue gas flow；The inner loop PID controller controls spray ammonia valve opening according to ammonia spraying amount control signal, ammonia spraying amount feed-forward control signals and ammonia flow feedback signal.The present invention adds gain scheduling model, hour mean value model in main ring, realizes automatically controlling for denitrating system variable working condition；Entrance concentration purging calibration model is introduced in inner loop, realizes the dynamic corrections of ammonia spraying amount, for accurate control ammonia spraying amount, realizes that overall process robustness and full working scope qualified discharge provide technical support.
Description
Technical field
The present invention relates to one kind can effectively improve thermal power generation unit denitrating system overall process robustness, and realize full working scope
The control method of qualified discharge, belongs to technical field of power generation.
Background technology
At present, environmental pollution has become an important factor for puzzlement social development and human life and health, with electric power work
Industry develops rapidly, and the parameter and capacity of Thermal generation unit constantly increase, and the NOx that coal-burning power plant gives off is to caused by air
Pollution getting worse, there is photochemical fog in many areas, and its pollution is also constantly aggravating.Control nitrogen oxides row
Pollution keypoint treatment work is high-volume turned into, the ultralow near-zero release for realizing nitrogen oxides is the important class that need be solved at this stage
Topic.
Selective catalytic reduction (SCR) denitration technology is widely used in coal-burning power plant's control NOx discharge.Due to its compared with
High denitration efficiency, SCR denitration system are the preferred types of Large-scale fire-electricity unit denitrating system transformation in recent years, and for a long time
Research to SCR denitration system mainly in terms of its physical principle, device structure and the method for operation, but have ignored pair always
The research of denitration Automatic Control Strategy, and in fact the longtime running cost of the automatic Control Quality of denitrating system and power plant is close
It is related.
In engineering practice, control of the thermal power plant to ammonia spraying amount largely relies on manual modulation valve door aperture or traditional PI D
Controller realizes that control effect is unsatisfactory, and part power plant SCR exit NOx concentrations exceed row of the country to atmosphere pollution
Limit value is put, and can not ensure that SCR exit NOx concentrations are stable in setting value while ammonia spraying amount optimal control is realized.By
In control strategy designs indefinite imperfection, control targe, in-site measurement condition difference the problems such as, the SCR of part fired power generating unit takes off
Nitre control hysteresis quality is larger, as SCR inlet NOXWhen concentration measuring point purges, measuring point numerical value is in distortion status, and now ammonia spraying amount is not
SCR inlet NO can be directed in timeXCorresponding adjustment is made in the change of concentration, causes the automatic input rate and input effect of system
It is poor so that the runnability of whole denitrating system is significantly affected.Therefore, thermal power generation unit denitration system how is improved
System overall process robustness, realize that full working scope qualified discharge just turns into the problem that relevant expert scholar faces.
The content of the invention
It is an object of the invention to the drawback for prior art, there is provided a kind of full working scope of fired power generating unit denitrating system reaches
Discharge control method is marked, to improve the closed loop stability of denitrating system and Ability of Resisting Disturbance.
Problem of the present invention is that solved with following technical proposals：
A kind of full working scope qualified discharge control method of fired power generating unit denitrating system, methods described is in denitration control system
Main ring PID controller, inner loop PID controller and feedforward controller are set, and the main ring PID controller is according to Benitration reactor
Exit NOx concentration setting value and exit NOx concentration feedback signal calculate ammonia spraying amount control signal；The feedforward controller according to
The denitration reactor inlet NOx concentration and flue gas flow that purging correction NOx concentration, NOx predicted concentrations, sensor measure calculate spray
Ammonia amount feed-forward control signals；The inner loop PID controller is according to ammonia spraying amount control signal, ammonia spraying amount feed-forward control signals and ammonia
Flow feedback signal control spray ammonia valve opening.
The full working scope qualified discharge control method of above-mentioned fired power generating unit denitrating system, the feedforward controller calculate ammonia spraying amount
The method of feed-forward control signals is as follows：To be burnt in denitration reactor inlet NOx concentration, the dynamic calibration value of flue gas flow and stove
The product for the NOx predicted concentrations that NOx generation prediction models provide is believed as the feed-forward signal of inner loop PID controller in the feedforward
Purging correction NOx concentration is added in number, that is, obtains ammonia spraying amount feed-forward control signals, the purging correction NOx concentration is dense by entrance
Degree purging calibration model is provided by contrasting the measured value of the offside SCR run parallel inlet NOx concentration, and specific method is：
If the measuring point data of B side entrances NOx concentration is in distortion status, using in offside (A sides) inlet NOx concentration Δ t times
Changing value Δ CNOx,ATo predict from being purged start time the B side entrances NOx concentration C after the Δ t timesNOx,B, specific formula
For：
In formula,For B side entrances NOx concentration before purging, Δ t is purge time.
The full working scope qualified discharge control method of above-mentioned fired power generating unit denitrating system, the main ring PID controller is according to de-
When the exit NOx concentration setting value and exit NOx concentration feedback signal of nitre reactor calculate ammonia spraying amount control signal, it inputs letter
Number it is prepared by the following：
Cigarette per hour is obtained by the measured value of chimney inlet NOx concentration and the hour target mean model of set value calculation
The weighted average of chimney inlet NOx concentration deviation, the deviation obtain after being added with the exit NOx concentration setting value of Benitration reactor
To new exit NOx concentration set-point, the exit NOx concentration set-point is done partially with the exit NOx concentration measured value fed back
Difference, obtain the input signal of main ring PID controller；
The hour target mean model is provided by the measured value and setting value of chimney inlet NOx concentration, and specific method is：
Chimney inlet NOx concentration measured value CNOxWith setting value RNOxDeviation is taken, and with index weights ω (k)=λm-kDone for weighted factor
Weighted average calculation, specific formula are：
In formula,For the small hourly value of chimney inlet NOx concentration deviation, CNOxFor chimney inlet NOx concentration measured value,
RNOxFor chimney inlet NOx concentration setting value, k=1,2 ..., m are k-th of sampled point, and m is the number of samples in 1 hour, and λ is
Positive number less than 1.
The full working scope qualified discharge control method of above-mentioned fired power generating unit denitrating system, the main ring PID controller is in difference
Pid parameter value under operating mode is adjusted by gain scheduling model according to flue gas flow and denitration reactor inlet temperature.
The full working scope qualified discharge control method of above-mentioned fired power generating unit denitrating system, the spray that main ring PID controller is exported
Ammonia amount control signal is sent into before inner loop PID controller, and reply ammonia spraying amount control signal is handled as follows：Entered with Benitration reactor
The measured value structure catalysis of mouthful temperature, the inlet NOx concentration of Benitration reactor, exit NOx concentration, flue gas flow and ammonia flow
Agent performance degradation assessment models, judge catalyst performance, the output of catalyst performance deterioration assessment models and flue gas flow and master
The ammonia spraying amount control signal of loop PID controller output is multiplied, and obtains spraying ammonia demand, spray ammonia demand and ammonia flow are measured
Amount value of feedback subtracts each other the input that resulting difference is sent into inner loop PID controller.
Catalyst performance deterioration assessment models output signal is catalyst activity b, and expression formula is：
In formula, b is catalyst activity, and v is flue gas flow (volume flow, m3·h-1), V is catalyst volume, and A is catalysis
Agent specific surface area (m2·m-3), η is denitration efficiency, and n is ammonia nitrogen mol ratio, c1,c2For reactor inlet, exit NOx concentration.
The present invention introduces prediction and Intelligent Feed-forward control based on model in inner loop, and denitrating system greatly improved
Closed loop stability and Ability of Resisting Disturbance, the dynamic corrections of required ammonia spraying amount when realizing the change of SCR inlet NOx concentration and distortion,
For accurate control ammonia spraying amount, the escaping of ammonia and ammonia consumption are reduced, overall process robustness and full working scope qualified discharge is realized, improves fire
The automatization level of power plant's denitration control system provides technical support.
Brief description of the drawings
Fig. 1 is the SCR denitration automatic control system overall plan figure of the present invention；
Fig. 2 is exit NOx concentration control figure；
Fig. 3 is denitration control system.
Each label is expressed as in figure：T, clock, CT, NOx concentration sensor, A, NOx concentration setting value, FT, flue gas
Flow sensor, TE, temperature sensor, f (x), correction function.
Each symbol is expressed as in text：ΔCNOx,AFor changing value in the A side entrances NOx concentration Δ t times, CNOx,BFor from
Purge start time from after the Δ t times B side entrances NOx concentration,For B side entrances NOx concentration before purging, Δ t is to blow
Flyback time, G (s) are transmission function, and K is gain coefficient, T1、T2For inertia time, τ is time delay, and s is differential divisor, and b is
Catalyst activity, v are flue gas flow (volume flow, m3·h-1), V is catalyst volume, and A is specific surface area of catalyst (m2·m-3), η is denitration efficiency, and n is ammonia nitrogen mol ratio, c1,c2For reactor inlet, exit NOx concentration.For chimney entrance NOx
The small hourly value of concentration deviation, CNOxFor chimney inlet NOx concentration measured value, RNOxFor chimney inlet NOx concentration setting value, k=
1,2 ..., m is k-th of sampled point, and m is the number of samples in 1 hour, and ω (t) is index weights, and λ is the positive number less than 1.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings.
Fig. 1 is the SCR denitration automatic control system overall plan figure of the present invention.Mainly there is a hour target mean mould in figure
Type, chimney per hour is obtained on the basis of the time that clock measures according to the measured value of chimney inlet NOx concentration and setting value and entered
The weighted average of mouth NOx concentration deviation, can be more accurate with reference to the exit NOx concentration setting value of Benitration reactor, there is generation
The reflection chimney inlet NOx concentration of table is horizontal.Catalyst performance deteriorates assessment models, according to the entrance of Benitration reactor, goes out
Measured value of mouth NOx concentration, flue gas flow and ammonia flow etc. obtains catalyst activity b, reflects catalyst reactor with this
Performance so that adjust ammonia spraying amount.Gain scheduling model is automatically adjusted under different load operating mode using flue gas flow as scheduling variable
Pid parameter value.Burning NOx generation prediction model provides denitration entrance NOx predicted concentrations in stove, makes tune to ammonia spraying amount in advance
It is whole.Entrance concentration purge calibration model according to offside SCR inlet NOx concentration come predict inlet NOx concentration measuring point purging when distortion
Data, the anti-interference of system can be improved.
Fig. 2 is exit NOx concentration control figure.Feedforward controller in figure can react flue gas flow, inlet NOx concentration in time
Change the interference brought, estimate NOx concentration, the NOx concentration of distortion when correction purges adjusts ammonia spraying amount in advance, and strengthening system is adjusted
The promptness of section.Main ring PID controller according to input signals such as exit NOx concentration and its setting values, by gain scheduling model from
Pid parameter value under the different operating modes of dynamic amendment, the control signal of ammonia spraying amount is exported to secondary PID controller.Secondary PID controller effect
It is that ammonia valve opening is sprayed according to the Signal Regulation of main ring PID controller.
Fig. 3 is denitration control system installation drawing.Flue gas inspection sensor in figure can measure NOx concentration.With dsp chip
Spray ammonia main ring PID controller for core receives the input signal of computer and the NOx concentration signal of flue gas inspection sensor is adjusted
Control method and parameter of the spray ammonia of section input single-chip microcomputer etc..The major function of single-chip microcomputer is according to spray ammonia main ring PID controller
The control signal of determination, the aperture of regulation spray ammonia regulating valve.
The invention provides a kind of denitration autocontrol method of perfect in shape and function, its technical scheme are as follows：
The present invention is corrected ammonia spraying amount, is improved the de- of SCR system in advance using the prediction based on model and Intelligent Feed-forward control
Nitre efficiency simultaneously reduces the escaping of ammonia rate.Prediction and Intelligent Feed-forward control based on model are introduced in inner loop, mainly passes through flue gas stream
Burning NOx generation prediction model, purging in amount, SCR inlet NOx concentration (i.e. denitration reactor inlet NOx concentration) change and stove
Calibration model is realized；Flue gas flow reflection unit load change；The change of SCR inlet NOx concentration reflects SCR under different load
The ammonia of interior denitrification process/nitrogen mol ratio；And burning NOx generation prediction model is then reflected due to process of coal combustion in stove in stove
The influence that organizational form difference generates to NOx in flue gas, its influence factor mainly have unit load, primary air flow (in reflection stove
Ignition temperature is horizontal), oxygen amount (excess air coefficient), each secondary air flow (or secondary air register combination), propellant composition it is (main
It is volatile matter, As-received nitrogen content).These feed-forward signals are all after the completion of reflection Boiler Furnace internal combustion burns, into SCR reactors it
Before, the change of NOx concentration in flue gas.Added with feed-forward mode in denitration automatic control system, big ginseng can be predicted in advance
Number change, in advance amendment spray ammonia valve door opening degree instruction, improve the robustness of SCR automatic control systems, automatically control denitration and are
System is more stablized, adapts to various varying load conditions.
Measuring point purging calibration model introduces in inner loop, caused by measuring point data distortion caused by can eliminating purge
Interference, solve the problems, such as that systematic survey hysteresis is big.In measuring point purge, realized using soft-measuring technique to NOx concentration
The measurement of data, real time correction is carried out to hard measurement result with the NOx measured values of reality.
The gain scheduling model of one adjust automatically pid parameter is set in main ring, due to the generation of NOx in boiler smoke
It is relevant with many factors, and redox NOx process and flue-gas temperature, ammonia/nitrogen mol ratio occur in SCR reactors, urges
Agent performance etc. is relevant.Under different load, the dynamic characteristic of chemical reaction process is different in SCR reactors, therefore establishes not
With the gain scheduling model under operating mode, adjust automatically pid parameter, to adapt under different load, the change of SCR reactor operation characteristics
Change, the parameter and object dynamic performance for making automatic control system match, realize automatically controlling for denitrating flue gas, improve system
Robustness.The control principle of the present invention is as shown in Figure 1.
The technological core of the present invention is the realization and application of SCR Automatic Control Strategies, and the present invention not only passes through hard measurement
Technology carries out the prediction of NOx content during measuring point purging, to solve the problems, such as that systematic survey hysteresis is big, and based on the pre- of model
Survey and the factor for influenceing burning NOx generation in stove is added to the predictive feed forward sprayed ammonia and controlled by Intelligent Feed-forward Control Strategy, including
Unit load, Coal-fired capacity, ature of coal and air quantity carry out school with generation of the air distribution mode to SCR reactor inlets NOx concentration and NOx
Just, the ammonia valve door opening degree instruction of amendment spray in advance, realizes the accurate control of ammonia spraying amount, so that denitration automatic control system is more
Stabilization, adapt to various varying load conditions.
Referring to Fig. 1, obtained by the measured value of chimney inlet NOx concentration and the hour target mean model of set value calculation
Chimney inlet NOx concentration deviation signal weighted average hourly, itself and SCR exit NOx concentration setting value (i.e. denitration reactions
The exit NOx concentration setting value of device) be added after obtain new exit NOx concentration set-point, and the outlet NOx with feeding back is dense
Degree measured value does deviation, is input on main ring intelligent PID controller, gain scheduling model is according to flue gas flow and SCR inlet temperature
The difference of (i.e. denitration reactor inlet temperature) is spent, automatically adjusts pid parameter value of the main ring PID controller under different operating modes,
And then adjust ammonia spraying amount.In subloop, with SCR inlet temperature, SCR inlet NOx concentration, exit NOx concentration, flue gas flow and ammonia
The measured value structure catalyst performance deterioration assessment models of throughput, judge catalyst performance, and with flue gas flow and main ring PID
The output of controller is multiplied, and calculates spray ammonia demand, subtracts each other to obtain control deviation signal with ammonia flow measurement value of feedback, inputs
To inner loop PID controller；Mould is estimated with burning NOx generation in SCR inlet NOx concentration and the dynamic calibration value and stove of flue gas flow
The NOx predicted concentrations that type provides are made to ammonia spraying amount estimating in advance, eliminate big Parameters variation in advance as the feedforward of subloop
Influence to system, and entrance concentration purging calibration model is added in feedovering；Feedforward is believed plus the output of inner loop PID controller
Number collective effect more preferably adjusts ammonia spraying amount, improves denitration efficiency, reduce the escaping of ammonia, realize ammonia spraying amount in spray ammonia valve actuator
Automatically control.Entrance concentration purging calibration model, the entrance for the offside SCR that model contrast is run parallel are added in feedforward
The measured value of NOx concentration is come the interference of the measuring point data distortion of inlet NOx concentration caused by eliminating purge.If B sides enter
When the measuring point data of mouth NOx concentration is in distortion status, changing value Δ in offside (A sides) inlet NOx concentration Δ t times is utilized
CNOx,APrediction B side entrances NOx concentration C after the Δ t times from being purged start timeNOx,B, specific formula：Wherein,For B side entrances NOx concentration before purging, Δ t is purge time.
SCR denitration automatic control system is to be based on boiler controller system DCS system platform, is come with tandem plus the control mode of feedforward
Realize, its control figure is as shown in Figure 2.The control system subloop controls for ammonia flow, and major loop is exit NOx concentration control
System.For reactor outlet NOx concentration as regulated variable, the Jian degree of ammonia flow regulating valve is regulated quantity.Cascade control system has two
Individual controller, wherein exit NOx concentration controller are main ring PID controller, and host computer gives exit NOx concentration setting
Value, the exit NOx concentration feedback signal that reactor outlet flue gas inspection sensor measures, (gain is inside set by gain scheduling model
Dispatch list) pid parameter value under the different operating modes corrected automatically, these signals input main ring PID controller adjustment ammonia spraying amount
Maintain exit NOx concentration stable；Purging corrects NOx concentration and estimates NOx concentration signal, reactor inlet flue gas inspection sensor
Inlet NOx concentration and flue gas flow signal the input feedforward controller measured, feedforward controller output ammonia spraying amount control signal arrive
Inner loop PID controller, NH3Flow controller is inner loop PID controller, receives the defeated of main ring PID controller and feedforward controller
Go out signal and the actual ammonia flow feedback signal from ammonia regulating valve, rapidly and accurately to adjust spray ammonia valve opening.
The transmission function that denitration automatic control system exit NOx concentration controls isK in formula
For gain coefficient, T1、T2For inertia time, τ is time delay, and s is differential divisor.
The exit NOx concentration Controlling model established under different operating modes, and its corresponding pid parameter is adjusted, create gain and adjust
Table is spent, adjust automatically pid parameter value, is automatically controlled using exit NOx concentration under gain scheduling model realization variable working condition.
The hardware (as shown in Figure 3) of denitration spray ammonia control system mainly includes the spray ammonia main ring PID using dsp chip as core
Controller and using STC15F4K60S4 single-chip microcomputers as spray ammonia function control device of core etc..Host computer passes on control command to give
DSP sprays ammonia main ring PID controller, sets the target NOx concentration of denitrating system, the parameters at different levels of denitrating system and the control for spraying ammonia device
Method processed etc..Spray going out in real time for input signal and smoke detectors detection of the reception of ammonia main ring PID controller from computer
Mouth NOx concentration value, assessment models, hour target mean model are deteriorated according to the purging calibration model, the catalyst performance that establish
And gain scheduling model etc. carries out processing calculating.The function single-chip microcomputer of each spray ammonia device of ammonia main ring PID controller connection control is sprayed,
Target NOx concentration, spray the control method of ammonia and partial data input single-chip microcomputer obtains the reality of spray ammonia by single-chip microcomputer simultaneously
Control situation.Every state parameter data feedback that spray ammonia main ring PID controller controls spray ammonia is taken off in real time to computer
The picture of nitre operation conditions is shown.The road flue gas inspection of spray ammonia function control device connection 8 using STC15F4K60S4 single-chip microcomputers as core
Survey sensor and obtain each region NOXReal-time concentration, processor of single chip computer receive come blowing ammonia main ring PID controller control letter
Number, according to NOXReal-time concentration and the control signal that determines of spray ammonia main ring PID controller carry out computing, it is determined that spray ammonia regulating valve
Aperture, output signal to ammonia flow regulating valve, control is de- to adapt to enter in proper range into the ammonia spraying amount of reactor
The real-time NO of nitre reactorXContent.Regulating valve receives the control signal from single-chip microcomputer and changes valve opening, and ammonia is sprayed into denitration
Reactor is chemically reacted with NOx.In order to improve measurement accuracy, in the NO of realityXIn Concentration Testing, in reactor exit
Multichannel NO is installedXThe outlet NO that concentration sensor is measuredXConcentration feedback gives main ring PID controller.
The innovative point of the present invention is to use soft-measuring technique to the parameter of easy distortion in denitrating system, realizes distortion
Parameter simulation, field device issue is reduced to automatically controlling the influence of logic.When SCR inlet NOx concentration measuring point is in purging etc.
During situation, measuring point numerical value is in distortion status, and now ammonia spraying amount can not reflect the influence of SCR inlet NOx concentration change in time.Should
Soft-measuring technique is corrected to the ammonia spraying amount when the measuring point distortion of SCR inlet NOx concentration.Carried out by soft-measuring technique
NOx prediction can solve the problems, such as that systematic survey hysteresis is big very well, then by introducing multivariable parameter, be for automatically controlling
The performance optimization of system, so that denitration NOx automatic control systems are stable, adapt to the distortion of measuring point and various varying duties during purging
Operating mode.Compared with conventional PID controllers, the automatic control system of this method can improve denitration efficiency, realize ammonia spraying amount oneself
Dynamic accurate control, reduces the escaping of ammonia rate and ammonia consumption.
The present invention will purge calibration model for the large time delay characteristic of denitration control, influence that burning NOx in stove generates because
Element is added in the intelligent predicting feed forward models of spray ammonia control, using the prediction based on model and Intelligent Feed-forward control technology to de-
The disturbance factor of nitre control system enters Mobile state compensation, predicts the fluctuation of SCR inlet NOx concentration in time from reaction source, significantly
Improve the closed loop stability and Ability of Resisting Disturbance of denitrating system.
Primary and secondary ring PID controller in the present invention uses identical device, is XMPA-3000 series.
This method has taken into full account the various factors of interference system stability, on the premise of plant characteristic is fully understood by,
The optimization of related control strategies has been carried out, has established anti-interference model, synthesis improves system robustness.
Claims (5)
1. a kind of full working scope qualified discharge control method of fired power generating unit denitrating system, it is characterized in that, methods described is in denitration control
Main ring PID controller, inner loop PID controller and feedforward controller are set in system processed, and the main ring PID controller is according to denitration
The exit NOx concentration setting value and exit NOx concentration feedback signal of reactor calculate ammonia spraying amount control signal；The feedforward control
The denitration reactor inlet NOx concentration and flue gas stream that device processed measures according to purging correction NOx concentration, NOx predicted concentrations, sensor
Amount calculates ammonia spraying amount feed-forward control signals；The inner loop PID controller is believed according to ammonia spraying amount control signal, ammonia spraying amount feedforward control
Number and ammonia flow feedback signal control spray ammonia valve opening.
2. the full working scope qualified discharge control method of fired power generating unit denitrating system according to claim 1, it is characterized in that, institute
The method for stating feedforward controller calculating ammonia spraying amount feed-forward control signals is as follows：With denitration reactor inlet NOx concentration, flue gas flow
Dynamic calibration value and stove in burning NOx generation predicted concentration product as inner loop PID controller feed-forward signal, before this
Purging correction NOx concentration is additionally added in feedback signal, that is, obtains ammonia spraying amount feed-forward control signals.It is described purging correction NOx concentration by
Entrance concentration purges calibration model and provided by contrasting the measured value of the offside SCR run parallel inlet NOx concentration, specific side
Method is：If the measuring point data of B side entrances NOx concentration is in distortion status, during using offside (A sides) inlet NOx concentration Δ t
Interior changing value Δ CNOx,ATo predict from being purged start time the B side entrances NOx concentration C after the Δ t timesNOx,B, it is specific public
Formula is：
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In formula,For B side entrances NOx concentration before purging, Δ t is purge time.
3. the full working scope qualified discharge control method of fired power generating unit denitrating system according to claim 1 or 2, its feature
It is that the main ring PID controller is according to the exit NOx concentration setting value and exit NOx concentration feedback signal meter of Benitration reactor
When calculating ammonia spraying amount control signal, its input signal is prepared by the following：By the measured value of chimney inlet NOx concentration and set
The hour target mean model of setting control obtains the weighted average of chimney inlet NOx concentration deviation per hour, the deviation
New exit NOx concentration set-point, the exit NOx concentration are obtained after being added with the exit NOx concentration setting value of Benitration reactor
Set-point makes the difference with the reactor outlet NOx concentration measured value fed back, obtains the input signal of main ring PID controller；
The hour target mean model is provided by the measured value and setting value of chimney inlet NOx concentration, and specific method is：Chimney
Inlet NOx concentration measured value CNOxWith setting value RNOxDeviation is taken, and with index weights ω (k)=λm-kWeighted for weighted factor
Average computation, specific formula are：
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In formula,For the small hourly value of chimney inlet NOx concentration deviation, CNOxFor chimney inlet NOx concentration measured value, RNOx
For chimney inlet NOx concentration setting value, k=1,2 ..., m are k-th of sampled point, and m is the number of samples in 1 hour, and λ is small
In 1 positive number.
4. the full working scope qualified discharge control method of fired power generating unit denitrating system according to claim 3, it is characterized in that, institute
Pid parameter value of the main ring PID controller under different operating modes is stated by gain scheduling model according to flue gas flow and Benitration reactor
Inlet temperature is adjusted.
5. the full working scope qualified discharge control method of fired power generating unit denitrating system according to claim 4, it is characterized in that, will
The ammonia spraying amount control signal of main ring PID controller output is sent into before inner loop PID controller, and reply ammonia spraying amount control signal is made such as
Lower processing：With denitration reactor inlet temperature, the inlet NOx concentration of Benitration reactor, exit NOx concentration, flue gas flow and ammonia
The measured value structure catalyst performance deterioration assessment models of throughput, judge catalyst performance, mould is assessed in catalyst performance deterioration
The output of type is multiplied with flue gas flow and ammonia spraying amount control signal, obtains spraying ammonia demand, by spray ammonia demand and ammonia flow
Measurement value of feedback subtracts each other the input that resulting difference is sent into inner loop PID controller；
Catalyst performance deterioration assessment models output signal is catalyst activity b, and expression formula is：
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<mi>b</mi>
<mo>=</mo>
<mfrac>
<mi>v</mi>
<mrow>
<mi>V</mi>
<mo>&CenterDot;</mo>
<mi>A</mi>
</mrow>
</mfrac>
<mo>&CenterDot;</mo>
<mi>l</mi>
<mi>n</mi>
<mrow>
<mo>(</mo>
<mn>1</mn>
<mo>-</mo>
<mfrac>
<mi>&eta;</mi>
<mi>n</mi>
</mfrac>
<mo>)</mo>
</mrow>
</mrow>
<mrow>
<mi>&eta;</mi>
<mo>=</mo>
<mfrac>
<mrow>
<msub>
<mi>c</mi>
<mn>1</mn>
</msub>
<mo>-</mo>
<msub>
<mi>c</mi>
<mn>2</mn>
</msub>
</mrow>
<msub>
<mi>c</mi>
<mn>1</mn>
</msub>
</mfrac>
</mrow>
In formula, b is catalyst activity, and v is flue gas flow (volume flow, m3·h-1), V is catalyst volume, is catalyst ratio
Surface area (m2·m-3), η is denitration efficiency, and n is ammonia nitrogen mol ratio, c1,c2For reactor inlet, exit NOx concentration.
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|---|---|---|---|---|
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103077305A (en) * | 2012-12-30 | 2013-05-01 | 华北电力大学（保定） | Large-scale coal-fired boiler smoke gas flow rate soft measuring method |
| CN103592407A (en) * | 2013-11-07 | 2014-02-19 | 华北电力大学 | On-line power plant SCR (Selective Catalytic Reduction) denitration system catalyst activity monitoring method |
| JP2015048975A (en) * | 2013-08-30 | 2015-03-16 | 株式会社東芝 | Denitrification controller |
| CN104801180A (en) * | 2015-04-21 | 2015-07-29 | 中电投河南电力有限公司技术信息中心 | Ammonia spraying amount control method and system |
| CN105045089A (en) * | 2015-06-19 | 2015-11-11 | 大唐华银电力股份有限公司金竹山火力发电分公司 | Boiler denitration control method based on outlet NOx content control and system thereof |
| CN105487496A (en) * | 2015-08-10 | 2016-04-13 | 河北省电力建设调整试验所 | Optimization method for heat-engine plant thermal on-line process identification and control algorithm based on dual-objective parallel ISLAND-HFC mixed model genetic programming algorithm |
| CN105739302A (en) * | 2016-02-29 | 2016-07-06 | 西安西热锅炉环保工程有限公司 | Control method for SCR denitration system based on sensitive factor analysis |
| CN105892504A (en) * | 2015-07-30 | 2016-08-24 | 大唐环境产业集团股份有限公司 | Thermal power plant denitration ammonia supplying automatic return circuit control method and system |
| KR101669598B1 (en) * | 2015-12-02 | 2016-10-26 | 한국남동발전 주식회사 | Cascade control method using IDF outlet NOx analyzer for De-NOx process |
| CN106681381A (en) * | 2017-01-03 | 2017-05-17 | 华北电力大学 | SCR denitration system ammonia spraying quantity optimal control system and method based on intelligent feedforward signals |
-
2017
- 2017-09-01 CN CN201710778649.XA patent/CN107561941B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103077305A (en) * | 2012-12-30 | 2013-05-01 | 华北电力大学（保定） | Large-scale coal-fired boiler smoke gas flow rate soft measuring method |
| JP2015048975A (en) * | 2013-08-30 | 2015-03-16 | 株式会社東芝 | Denitrification controller |
| CN103592407A (en) * | 2013-11-07 | 2014-02-19 | 华北电力大学 | On-line power plant SCR (Selective Catalytic Reduction) denitration system catalyst activity monitoring method |
| CN104801180A (en) * | 2015-04-21 | 2015-07-29 | 中电投河南电力有限公司技术信息中心 | Ammonia spraying amount control method and system |
| CN105045089A (en) * | 2015-06-19 | 2015-11-11 | 大唐华银电力股份有限公司金竹山火力发电分公司 | Boiler denitration control method based on outlet NOx content control and system thereof |
| CN105892504A (en) * | 2015-07-30 | 2016-08-24 | 大唐环境产业集团股份有限公司 | Thermal power plant denitration ammonia supplying automatic return circuit control method and system |
| CN105487496A (en) * | 2015-08-10 | 2016-04-13 | 河北省电力建设调整试验所 | Optimization method for heat-engine plant thermal on-line process identification and control algorithm based on dual-objective parallel ISLAND-HFC mixed model genetic programming algorithm |
| KR101669598B1 (en) * | 2015-12-02 | 2016-10-26 | 한국남동발전 주식회사 | Cascade control method using IDF outlet NOx analyzer for De-NOx process |
| CN105739302A (en) * | 2016-02-29 | 2016-07-06 | 西安西热锅炉环保工程有限公司 | Control method for SCR denitration system based on sensitive factor analysis |
| CN106681381A (en) * | 2017-01-03 | 2017-05-17 | 华北电力大学 | SCR denitration system ammonia spraying quantity optimal control system and method based on intelligent feedforward signals |
Non-Patent Citations (1)
| Title |
|---|
| 夏维等: "600MW机组NOx"超低排放"自动控制综合优化", 《广东电力》 * |
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