CN108187492A - A kind of spray ammonia control method and device - Google Patents
A kind of spray ammonia control method and device Download PDFInfo
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- CN108187492A CN108187492A CN201810044539.5A CN201810044539A CN108187492A CN 108187492 A CN108187492 A CN 108187492A CN 201810044539 A CN201810044539 A CN 201810044539A CN 108187492 A CN108187492 A CN 108187492A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/346—Controlling the process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
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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
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D11/00—Control of flow ratio
- G05D11/02—Controlling ratio of two or more flows of fluid or fluent material
- G05D11/13—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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Abstract
The embodiment of the invention discloses a kind of spray ammonia control method and device.The spray ammonia control method provided in the present invention is with the NO of the neat stress of chimney outletxConcentration measurement is as main regulated variable, because the flue gas of chimney outlet is the flue gas for being finally discharged into air, therefore ensures the NO of neat stressxConcentration can ensure the NO for the flue gas being discharged into airxConcentration is qualified and stablizes, while the neat stress of chimney outlet, because by multiple dust removal by filtration and longer smoke path, dustiness is relatively low, and temperature is relatively low, and NO is detected in chimney outletxDuring concentration, NO is improvedxThe purge cycles of apparatus for measuring concentration, and avoid leading to high failure rate because of high temperature, solve current spray ammonia control system for NOxConcentration control is unstable, and NOxThe apparatus for measuring concentration period is shorter and high failure rate, the technical issues of influencing to spray the normal control of ammonia control system.
Description
Technical field
The present invention relates to thermoelectricity exhaust-gas treatment field more particularly to a kind of spray ammonia control method and device.
Background technology
Nitrogen oxides (referred to as " NOx") it is one of three big pollutant effulent of fired power generating unit flue gas, China is to NOxConcentration of emission
There is stringent concentration of emission index request.In order to touch the mark requirement, coal steam-electric plant smoke before air is discharged into, be required for through
Dedusting, desulfurization and denitration process are crossed, wherein denitration process is exactly to reduce NO by the method for physics or chemistryxConcentration of emission.
Wherein, selective catalytic reduction (Selective Catalytic Reduction, SCR) is thermal power plant's application
Extensive denitration method for flue gas, the reducing agent ammonia (NH used3) under 299-400 degrees Celsius can by nitric oxide (NO) and
Nitrogen dioxide (NO2) it is reduced into nitrogen (N2), and NH hardly occurs3With oxygen (O2) oxidation reaction, so as to reduce NOxDischarge
Concentration achievees the purpose that denitrating flue gas.
But currently the spray ammonia control system of the ammonia spraying amount of control SCR is often with the NO in SCR exitsxConcentration is as main quilt
Tune amount, but SCR exiting flue gas is also needed to the chimney breast for draining into air by desulphurization system, dust pelletizing system and longer cigarette
Gas circuit diameter, control SCR outlet NOxConcentration qualification does not ensure that chimney breast NOxConcentration is qualified and stablizes, simultaneously as SCR
Outlet temperature height and dust content are high, the NO in SCR exitsxApparatus for measuring concentration purge cycles are shorter and high failure rate, sternly
Ghost image rings the normal controlled level of spray ammonia control system.
Therefore, current spray ammonia control system is resulted in for NOxConcentration control is unstable, and NOxApparatus for measuring concentration
Period is shorter and high failure rate, the technical issues of influencing to spray the normal control of ammonia control system.
Invention content
The present invention provides a kind of spray ammonia control method and device, solve current spray ammonia control system for NOxIt is dense
Degree control is unstable, and NOxThe apparatus for measuring concentration period is shorter and high failure rate, influences to spray the normal control of ammonia control system
The technical issues of.
Ammonia control method is sprayed the present invention provides a kind of, including：
S1：Obtain the NO of neat stressxConcentration measurement, by the NO of neat stressxConcentration measurement subtracts the NO of neat stressxIt is dense
Degree setting is worth to the first difference, judges whether the first difference is greater than or equal to 0, if so, using NOxConcentration rises corresponding
Controller is as master controller, if it is not, then using NOxConcentration declines corresponding controller as master controller, wherein, neat stress
NOxConcentration measurement is the NO of chimney outletxConcentration measurement；
S2：By the NO of neat stressxThe NO of concentration measurement and neat stressxIn concentration set point input master controller, sprayed
Ammonia amount average set value.
Preferably, it is further included before step S1：Step S0；
S0：Obtain neat stress NOxConcentration object model and unit load characterization parameter, according to neat stress NOxConcentration model and
Unit load characterization parameter is respectively to NOxConcentration rises corresponding controller model and NOxConcentration declines corresponding controller model
Parameter tuning is carried out, obtains NOxConcentration rises corresponding controller and NOxConcentration declines corresponding controller.
Preferably, it is further included after step S2：Step S3 and step S4；
S3：The NO that first side SCR is exportedxConcentration measurement subtracts the NO of the second side SCR outletsxMeasurement of concetration is worth to
Second difference is inputted in offset controller and obtains ammonia spraying amount bias by the second difference；
S4：Ammonia spraying amount average set value is worth to the of the first side SCR spray ammonia flow regulating valves plus ammonia spraying amount biasing
Ammonia spraying amount average set value is worth to the second side SCR spray ammonia flow regulating valves by one spray ammonia flow value plus ammonia spraying amount biasing
Second spray ammonia flow value.
Preferably, neat stress NOxConcentration object model is specially：
Wherein, k is target gain, and τ is the object pure delay time, and n is object exponent number, and T is time constant of object.
Preferably, unit load characterization parameter specifically includes：Unit load and/or steam flow and/or total fuel flow.
Ammonia control device is sprayed the present invention provides a kind of, including：
Walking direction unit, for obtaining the NO of neat stressxConcentration measurement, by the NO of neat stressxConcentration measurement subtracts
The NO of neat stressxConcentration set point obtains the first difference, judges whether the first difference is greater than or equal to 0, if so, using NOxIt is dense
Degree rises corresponding controller as master controller, if it is not, then using NOxConcentration declines corresponding controller as main control
Device, wherein, the NO of neat stressxConcentration measurement is the NO of chimney outletxConcentration measurement；
Ammonia control unit is sprayed, for by the NO of neat stressxThe NO of concentration measurement and neat stressxConcentration set point input master
In controller, ammonia spraying amount average set value is obtained.
Preferably, it further includes：Parameter tuning unit；
Parameter tuning unit, for obtaining neat stress NOxConcentration object model and unit load characterization parameter, according to net cigarette
Gas NOxConcentration model and unit load characterization parameter are respectively to NOxConcentration rises corresponding controller model and NOxConcentration declines
Corresponding controller model carries out parameter tuning, obtains NOxConcentration rises corresponding controller and NOxConcentration declines corresponding control
Device processed.
Preferably, it further includes：Bias setting unit and bias compensation unit；
Setting unit is biased, for the NO for exporting the first side SCRxConcentration measurement subtracts the NO of the second side SCR outletsx
Measurement of concetration is worth to the second difference, and the second difference is inputted in offset controller and obtains ammonia spraying amount bias；
Bias compensation unit, for ammonia spraying amount average set value to be worth to the first side SCR spray ammonia plus ammonia spraying amount biasing
Ammonia spraying amount average set value is worth to the second side SCR sprays by the first spray ammonia flow value of flow control valve plus ammonia spraying amount biasing
Second spray ammonia flow value of ammonia flow regulating valve.
Preferably, neat stress NOxConcentration object model is specially：
Wherein, k is target gain, and τ is the object pure delay time, and n is object exponent number, and T is time constant of object.
Preferably, unit load characterization parameter specifically includes：Unit load amount and/or steam flow and/or total fuel flow
Amount.
As can be seen from the above technical solutions, the present invention has the following advantages：
Ammonia control method is sprayed the present invention provides a kind of, including：S1：Obtain the NO of neat stressxConcentration measurement, by net cigarette
The NO of gasxConcentration measurement subtracts the NO of neat stressxConcentration set point obtains the first difference, judge the first difference whether be more than or
Equal to 0, if so, using NOxConcentration rises corresponding controller as master controller, if it is not, then using NOxConcentration decline pair
The controller answered as master controller, wherein, the NO of neat stressxConcentration measurement is the NO of chimney outletxConcentration measurement；
S2：By the NO of neat stressxThe NO of concentration measurement and neat stressxIn concentration set point input master controller, obtain ammonia spraying amount and be averaged
Setting value.
The spray ammonia control method provided in the present invention is with the NO of the neat stress of chimney outletxConcentration measurement is as main quilt
Tune amount because the flue gas of chimney outlet is the flue gas for being finally discharged into air, therefore ensures the NO of neat stressxConcentration can protect
Card is discharged into the NO of the flue gas in airxConcentration is qualified and stablizes, while the neat stress of chimney outlet, because by multiple
Dust removal by filtration and longer smoke path, so dustiness is relatively low, temperature is relatively low, and NO is detected in chimney outletxDuring concentration, carry
High NOxThe purge cycles of apparatus for measuring concentration, and avoid leading to high failure rate because of high temperature, solve current spray ammonia control
System is for NOxConcentration control is unstable, and NOxThe apparatus for measuring concentration period is shorter and high failure rate, influences to spray ammonia control system
The technical issues of normal control of system.
Description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also
To obtain other attached drawings according to these attached drawings.
Fig. 1 is a kind of flow diagram of one embodiment for spraying ammonia control method provided in an embodiment of the present invention；
Fig. 2 is a kind of flow diagram of another embodiment for spraying ammonia control method provided in an embodiment of the present invention；
Fig. 3 is a kind of structure diagram of one embodiment for spraying ammonia control device provided in an embodiment of the present invention；
Fig. 4 is the practical structures figure of a kind of spray ammonia control device that application examples of the present invention provides.
Specific embodiment
An embodiment of the present invention provides it is a kind of spray ammonia control method and device, solve current spray ammonia control system for
NOxConcentration control is unstable, and NOxThe apparatus for measuring concentration period is shorter and high failure rate, influences to spray the normal of ammonia control system
The technical issues of control.
In order to make the invention's purpose, features and advantages of the invention more obvious and easy to understand, below in conjunction with the present invention
Attached drawing in embodiment is clearly and completely described the technical solution in the embodiment of the present invention, it is clear that disclosed below
Embodiment be only part of the embodiment of the present invention, and not all embodiment.Based on the embodiments of the present invention, this field
All other embodiment that those of ordinary skill is obtained without making creative work, belongs to protection of the present invention
Range.
Referring to Fig. 1, an embodiment of the present invention provides a kind of one embodiment for spraying ammonia control method, including：
Step 101：Obtain the NO of neat stressxConcentration measurement, by the NO of neat stressxConcentration measurement subtracts neat stress
NOxConcentration set point obtains the first difference, judges whether the first difference is greater than or equal to 0, if so, using NOxConcentration rising pair
The controller answered is as master controller, if it is not, then using NOxConcentration declines corresponding controller as master controller, wherein, only
The NO of flue gasxConcentration measurement is the NO of chimney outletxConcentration measurement；
It should be noted that nitrogen oxides (referred to as " NOx”)：Refer to the compound being only made of two kinds of nitrogen, oxygen elements；
Common nitrogen oxides has nitric oxide (NO, colourless), nitrogen dioxide (NO2, rufous), nitrous oxide (N2O)
With dinitrogen pentoxide (N2O5) etc., wherein being all in gas in addition to being in solid under dinitrogen pentoxide normality, under other nitrogen oxides normalities
State, the nitrogen oxides (NO as air pollutantsx) often refer to NO and NO2；
Due to NOxConcentration rises and NOxConcentration declines corresponding controller parameter difference, so needing using different controls
Device parameter processed, specific controller parameter computational methods are common technology means, and details are not described herein；
With NOxConcentration rises and NOxIt can be that same controller is different with two sets that concentration, which declines corresponding controller,
Parameter or two independent controllers are selected as needed in actual application.
Step 102：By the NO of neat stressxThe NO of concentration measurement and neat stressxIn concentration set point input master controller,
Obtain ammonia spraying amount average set value.
It should be noted that the spray ammonia control method provided in the present embodiment is with the NO of the neat stress of chimney outletxIt is dense
Measured value is spent as main regulated variable, because the flue gas of chimney outlet is the flue gas for being finally discharged into air, therefore ensures net cigarette
The NO of gasxConcentration can ensure the NO for the flue gas being discharged into airxConcentration is qualified and stablizes, while the net cigarette of chimney outlet
Gas, because by multiple dust removal by filtration and longer smoke path, dustiness is relatively low, and temperature is relatively low, in chimney breast
Place's detection NOxDuring concentration, NO is improvedxThe purge cycles of apparatus for measuring concentration, and avoid leading to high failure rate because of high temperature, it solves
The spray ammonia control system for having determined current is for NOxConcentration control is unstable, and NOxThe apparatus for measuring concentration period is shorter and failure
Rate is high, the technical issues of influencing to spray the normal control of ammonia control system.
It is above a kind of one embodiment for spraying ammonia control method provided in an embodiment of the present invention, implements below for the present invention
A kind of another embodiment for spray ammonia control method that example provides.
Referring to Fig. 2, an embodiment of the present invention provides a kind of another embodiment for spraying ammonia control method, including：
Step 201：Obtain neat stress NOxConcentration object model and unit load characterization parameter, according to neat stress NOxConcentration
Model and unit load characterization parameter are respectively to NOxConcentration rises corresponding controller model and NOxConcentration declines corresponding control
Device model carries out parameter tuning, obtains NOxConcentration rises corresponding controller and NOxConcentration declines corresponding controller；
It should be noted that the corresponding neat stress NO of different unit load characterization parametersxConcentration object model is also not to the utmost
Think identical, neat stress NO can be obtained by practical measurementxConcentration object model and unit load characterization parameter, according to neat stress
NOxConcentration model and unit load characterization parameter are respectively to NOxConcentration rises corresponding controller model and NOxConcentration decline pair
The controller model answered carries out parameter tuning, obtains NOxConcentration rises corresponding controller and NOxConcentration declines corresponding control
Device；
Parameter tuning process can directly apply mechanically existing formula, repeat no more again.
Step 202：Obtain the NO of neat stressxConcentration measurement, by the NO of neat stressxConcentration measurement subtracts neat stress
NOxConcentration set point obtains the first difference, judges whether the first difference is greater than or equal to 0, if so, step 203 is performed, if
It is no, then step 204 is performed, wherein, the NO of neat stressxConcentration measurement is the NO of chimney outletxConcentration measurement；
It should be noted that the first difference is more than or equal to 0, then illustrate NOxConcentration rises, and performs step 203 at this time, uses
NOxConcentration rises corresponding controller as master controller, and the first difference is less than 0, then illustrates NOxConcentration declines, and performs step at this time
Rapid 204, using NOxConcentration declines corresponding controller as master controller.
Step 203：Using NOxConcentration rises corresponding controller as master controller；
Step 204：Using NOxConcentration declines corresponding controller as master controller；
Step 205：By the NO of neat stressxThe NO of concentration measurement and neat stressxIn concentration set point input master controller,
Obtain ammonia spraying amount average set value；
It should be noted that the NO by neat stressxThe NO of concentration measurement and neat stressxConcentration set point inputs main control
In device, ammonia spraying amount average set value is obtained, can directly control each SCR by ammonia spraying amount average set value sprays ammonia flow adjusting
The ammonia spraying amount of valve can also be further processed.
Step 206：The NO that first side SCR is exportedxConcentration measurement subtracts the NO of the second side SCR outletsxConcentration measurement
The second difference is obtained, the second difference is inputted in offset controller and obtains ammonia spraying amount bias；
It should be noted that according to NOxConcentration balance principle needs to be biased compensation calculation, the second difference is inputted inclined
It puts and ammonia spraying amount bias is obtained in controller, the setting method of offset controller is common technological means, and details are not described herein；
Have two outlets, NO in conventional SCR devicexConcentration balance principle is by spraying ammonia control, making the first side SCR
Outlet and the NO of the second side SCR outletsxConcentration is of substantially equal；
Such as the NO in certain side SCR exitsxConcentration is higher, then by bias loop, suitably increases the ammonia spraying amount of the side, make this
The NO in side SCR exitsxConcentration reduces；
Or by bias loop, the ammonia spraying amount of opposite side is suitably reduced, makes the NO in opposite side SCR exitsxConcentration increases
It reduces.So as to finally make the NO in both sides SCR exitsxConcentration is of substantially equal
Step 207：Ammonia spraying amount average set value is worth to the first side SCR spray ammonia flow regulating valves plus ammonia spraying amount biasing
First spray ammonia flow value, by ammonia spraying amount average set value plus ammonia spraying amount biasing be worth to the second side SCR spray ammonia flow adjust
Second spray ammonia flow value of valve.
It should be noted that after calculating ammonia spraying amount bias, ammonia spraying amount average set value is obtained plus ammonia spraying amount bias
To the first spray ammonia flow value of the first side SCR spray ammonia flow regulating valves, ammonia spraying amount average set value is added into ammonia spraying amount bias
Obtain the second side SCR spray ammonia flow regulating valve second spray ammonia flow value, not only enable both sides SCR spray ammonia regulating valve according to
The NO of neat stressxConcentration, which rises, either to be declined corresponding increase or reduces ammonia spraying amount, it is also possible that the first side SCR outlets and the
Two side SCR export NOxConcentration keeps balance.
Further, neat stress NOxConcentration object model is specially：
Wherein, k is target gain, and τ is the object pure delay time, and n is object exponent number, and T is time constant of object.
It should be noted that neat stress NOxTarget gain, object pure delay time in concentration object model, object rank
Number and time constant of object can be obtained by practical measurement.
Further, unit load characterization parameter specifically includes：Unit load and/or steam flow and/or total fuel flow
Amount.
It should be noted that unit load characterization parameter includes：Unit load and/or steam flow and/or total fuel flow
Amount, unit load, steam flow and total fuel flow can be directly obtained according to actual condition.
The spray ammonia control method provided in the present embodiment is with the NO of the neat stress of chimney outletxConcentration measurement is as master
Regulated variable because the flue gas of chimney outlet is the flue gas for being finally discharged into air, is monitored with environmental protection administration and is taken a little unanimously, therefore
Ensure the NO of neat stressxConcentration can ensure the NO for the flue gas being discharged into airxConcentration is qualified and stablizes, while chimney breast
The neat stress at place, because by multiple dust removal by filtration and longer smoke path, dustiness is relatively low, and temperature is relatively low,
Chimney outlet detects NOxDuring concentration, NO is improvedxThe purge cycles of apparatus for measuring concentration, and avoid leading to high event because of high temperature
Barrier rate improves flue gas emission NOxThe stability and qualification rate of concentration index solve current spray ammonia control system for NOx
Concentration control is unstable, and NOxThe apparatus for measuring concentration period is shorter and high failure rate, influences to spray the normal control of ammonia control system
The technical issues of processed；
Each time according to neat stress NO during sample detectingxConcentration, which rises or declines, selects different controllers, makes
Ammonia control method must be sprayed in neat stress NOxConcentration rises or descent direction has good regulation quality；
Feelings are changed according to the physical quantity (unit load characterization parameter) of characterization unit load during sample detecting each time
Condition adjusts controller parameter, and unit is made to have good regulation quality in different load Duan Jun；
Simultaneously also according to NOxConcentration balance principle is provided with offset controller, realizes the NO of different SCR outletsxConcentration is put down
Weighing apparatus reduces the escaping of ammonia rate.
It is above a kind of another embodiment for spraying ammonia control method provided in an embodiment of the present invention, is of the invention real below
A kind of one embodiment of spray ammonia control device of example offer is provided.
Referring to Fig. 3, an embodiment of the present invention provides a kind of one embodiment for spraying ammonia control device, including：
Walking direction unit 301, for obtaining the NO of neat stressxConcentration measurement, by the NO of neat stressxConcentration measurement
Subtract the NO of neat stressxConcentration set point obtains the first difference, judges whether the first difference is greater than or equal to 0, if so, using
NOxConcentration rises corresponding controller as master controller, if it is not, then using NOxConcentration declines corresponding controller as master control
Device processed, wherein, the NO of neat stressxConcentration measurement is the NO of chimney outletxConcentration measurement；
Ammonia control unit 302 is sprayed, for by the NO of neat stressxThe NO of concentration measurement and neat stressxConcentration set point inputs
In master controller, ammonia spraying amount average set value is obtained.
Further, it further includes：Parameter tuning unit 300；
Parameter tuning unit 300, for obtaining neat stress NOxConcentration object model and unit load characterization parameter, according to
Neat stress NOxConcentration model and unit load characterization parameter are respectively to NOxConcentration rises corresponding controller model and NOxConcentration
Decline corresponding controller model and carry out parameter tuning, obtain NOxConcentration rises corresponding controller and NOxConcentration, which declines, to be corresponded to
Controller.
Further, it further includes：Bias setting unit 303 and bias compensation unit 304；
Setting unit 303 is biased, for the NO for exporting the first side SCRxConcentration measurement subtracts the second side SCR outlets
NOxMeasurement of concetration is worth to the second difference, and the second difference is inputted in offset controller and obtains ammonia spraying amount bias；
Bias compensation unit 304, for ammonia spraying amount average set value to be worth to the first side SCR sprays plus ammonia spraying amount biasing
Ammonia spraying amount average set value is worth to the second side SCR by the first spray ammonia flow value of ammonia flow regulating valve plus ammonia spraying amount biasing
Spray the second spray ammonia flow value of ammonia flow regulating valve.
Further, neat stress NOxConcentration object model is specially：
Wherein, k is target gain, and τ is the object pure delay time, and n is object exponent number, and T is time constant of object.
Further, unit load characterization parameter specifically includes：Unit load amount and/or steam flow and/or total fuel
Flow.
Referring to Fig. 4, the present invention provides a kind of practical application example for spraying ammonia control device, including：
Label in Fig. 4 for：1st, unit load characterization parameter；2nd, the NO of neat stressxConcentration measurement；3rd, the NO of neat stressx
Concentration set point；4th, neat stress NOxConcentration object model；5th, parameter tuning unit；6th, walking direction unit；7th, the control of spray ammonia is single
Member；8th, setting unit is biased；9th, adder；10th, subtracter；11st, the first spray ammonia flow value；12nd, the second spray ammonia flow value；
By taking the spray ammonia control device that 660MW ultra-supercritical coal-fired power generating units are implemented as an example, go out including the SCR of A, B side two
Mouth and the SCR spray ammonia flow regulating valves of A, B side two；
1st, according to unit load characterization parameter 1 and neat stress NOxConcentration object model 4 is in parameter tuning unit 5 to NOx
Concentration rises corresponding controller model and NOxConcentration declines corresponding controller model and carries out parameter tuning, obtains NOxConcentration
Rise corresponding controller and NOxConcentration declines corresponding controller；
2nd, according to the NO of neat stressxThe NO of concentration measurement 2 and neat stressxConcentration set point 3 is in walking direction unit 6
Judge NOxConcentration is rising or decline, and walking direction unit 6 is a switch, can switch corresponding controller or
Controller parameter is as master controller；
3rd, according to the NO of neat stressxThe NO of concentration measurement 2 and neat stressxConcentration set point 3 is in ammonia control unit 7 is sprayed
In main controller as input quantity input back selection, ammonia spraying amount average set value is exported；
4th, the NO that biasing setting unit 8 is exported according to the first side SCRxConcentration measurement subtracts the NO of the second side SCR outletsx
Measurement of concetration is worth to the second difference, and the second difference is inputted in offset controller and obtains ammonia spraying amount bias；
5th, adder 9 and subtracter 10 are altogether bias compensation unit, and add operation is carried out in adder 9, will be sprayed
Ammonia amount average set value is worth to the first spray ammonia flow value 11 of A sides SCR spray ammonia flow regulating valves plus ammonia spraying amount biasing, is subtracting
Subtraction is carried out in musical instruments used in a Buddhist or Taoist mass 10, ammonia spraying amount average set value is worth to B sides SCR spray ammonia flows plus ammonia spraying amount biasing is adjusted
Second spray ammonia flow value 12 of valve.
It is apparent to those skilled in the art that for convenience and simplicity of description, the device of foregoing description
With the specific work process of unit, the corresponding process in preceding method embodiment can be referred to, details are not described herein.
In several embodiments provided herein, it should be understood that disclosed device and method can pass through it
Its mode is realized.For example, the apparatus embodiments described above are merely exemplary, for example, the division of the unit, only
Only a kind of division of logic function can have other dividing mode in actual implementation, such as multiple units or component can be tied
It closes or is desirably integrated into another system or some features can be ignored or does not perform.Another point, it is shown or discussed
Mutual coupling, direct-coupling or communication connection can be the INDIRECT COUPLING or logical by some interfaces, device or unit
Letter connection can be electrical, machinery or other forms.
The unit illustrated as separating component may or may not be physically separate, be shown as unit
The component shown may or may not be physical unit, you can be located at a place or can also be distributed to multiple
In network element.Some or all of unit therein can be selected according to the actual needs to realize the mesh of this embodiment scheme
's.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, it can also
That each unit is individually physically present, can also two or more units integrate in a unit.Above-mentioned integrated list
The form that hardware had both may be used in member is realized, can also be realized in the form of SFU software functional unit.
If the integrated unit is realized in the form of SFU software functional unit and is independent product sale or uses
When, it can be stored in a computer read/write memory medium.Based on such understanding, technical scheme of the present invention is substantially
The part to contribute in other words to the prior art or all or part of the technical solution can be in the form of software products
It embodies, which is stored in a storage medium, is used including some instructions so that a computer
Equipment (can be personal computer, server or the network equipment etc.) performs the complete of each embodiment the method for the present invention
Portion or part steps.And aforementioned storage medium includes：USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only
Memory), random access memory (RAM, Random Access Memory), magnetic disc or CD etc. are various can store journey
The medium of sequence code.
The above, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to before
Embodiment is stated the present invention is described in detail, it will be understood by those of ordinary skill in the art that：It still can be to preceding
The technical solution recorded in each embodiment is stated to modify or carry out equivalent replacement to which part technical characteristic；And these
Modification is replaced, the spirit and scope for various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution.
Claims (10)
1. a kind of spray ammonia control method, which is characterized in that including：
S1：Obtain the NO of neat stressxConcentration measurement, by the NO of neat stressxConcentration measurement subtracts the NO of neat stressxConcentration is set
Definite value obtains the first difference, judges whether the first difference is greater than or equal to 0, if so, using NOxConcentration rises corresponding control
Device is as master controller, if it is not, then using NOxConcentration declines corresponding controller as master controller, wherein, the NO of neat stressx
Concentration measurement is the NO of chimney outletxConcentration measurement；
S2：By the NO of neat stressxThe NO of concentration measurement and neat stressxIn concentration set point input master controller, ammonia spraying amount is obtained
Average set value.
2. a kind of spray ammonia control method according to claim 1, which is characterized in that further included before step S1：Step S0；
S0：Obtain neat stress NOxConcentration object model and unit load characterization parameter, according to neat stress NOxConcentration model and unit
Load characterization parameter is respectively to NOxConcentration rises corresponding controller model and NOxConcentration declines corresponding controller model and carries out
Parameter tuning obtains NOxConcentration rises corresponding controller and NOxConcentration declines corresponding controller.
3. a kind of spray ammonia control method according to claim 1, which is characterized in that further included after step S2：Step S3
With step S4；
S3：The NO that first side SCR is exportedxConcentration measurement subtracts the NO of the second side SCR outletsxMeasurement of concetration is worth to second
Second difference is inputted in offset controller and obtains ammonia spraying amount bias by difference；
S4：Ammonia spraying amount average set value is worth to the first spray of the first side SCR spray ammonia flow regulating valves plus ammonia spraying amount biasing
Ammonia spraying amount average set value is worth to the second of the second side SCR spray ammonia flow regulating valves by ammonia flow value plus ammonia spraying amount biasing
Spray ammonia flow value.
A kind of 4. spray ammonia control method according to claim 2, which is characterized in that neat stress NOxConcentration object model is specific
For：
Wherein, k is target gain, and τ is the object pure delay time, and n is object exponent number, and T is time constant of object.
5. a kind of spray ammonia control method according to claim 2, which is characterized in that unit load characterization parameter specifically wraps
It includes：Unit load and/or steam flow and/or total fuel flow.
6. a kind of spray ammonia control device, which is characterized in that including：
Walking direction unit, for obtaining the NO of neat stressxConcentration measurement, by the NO of neat stressxConcentration measurement subtracts net cigarette
The NO of gasxConcentration set point obtains the first difference, judges whether the first difference is greater than or equal to 0, if so, using NOxIn concentration
Corresponding controller is risen as master controller, if it is not, then using NOxConcentration declines corresponding controller as master controller,
In, the NO of neat stressxConcentration measurement is the NO of chimney outletxConcentration measurement；
Ammonia control unit is sprayed, for by the NO of neat stressxThe NO of concentration measurement and neat stressxConcentration set point inputs main control
In device, ammonia spraying amount average set value is obtained.
7. a kind of spray ammonia control device according to claim 6, which is characterized in that further include：Parameter tuning unit；
Parameter tuning unit, for obtaining neat stress NOxConcentration object model and unit load characterization parameter, according to neat stress NOx
Concentration model and unit load characterization parameter are respectively to NOxConcentration rises corresponding controller model and NOxConcentration declines corresponding
Controller model carries out parameter tuning, obtains NOxConcentration rises corresponding controller and NOxConcentration declines corresponding controller.
8. a kind of spray ammonia control device according to claim 6, which is characterized in that further include：Bias setting unit and partially
Put compensating unit；
Setting unit is biased, for the NO for exporting the first side SCRxConcentration measurement subtracts the NO of the second side SCR outletsxConcentration
Measurement is worth to the second difference, and the second difference is inputted in offset controller and obtains ammonia spraying amount bias；
Bias compensation unit, for ammonia spraying amount average set value to be worth to the first side SCR spray ammonia flows plus ammonia spraying amount biasing
Ammonia spraying amount average set value is worth to the second side SCR spray ammonia streams by the first spray ammonia flow value of regulating valve plus ammonia spraying amount biasing
Second spray ammonia flow value of adjustable valve.
A kind of 9. spray ammonia control device according to claim 7, which is characterized in that neat stress NOxConcentration object model is specific
For：
Wherein, k is target gain, and τ is the object pure delay time, and n is object exponent number, and T is time constant of object.
10. a kind of spray ammonia control device according to claim 7, which is characterized in that unit load characterization parameter specifically wraps
It includes：Unit load amount and/or steam flow and/or total fuel flow.
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| CN113750793A (en) * | 2020-06-17 | 2021-12-07 | 绍兴旗滨玻璃有限公司 | Ammonia injection control method and device for flue gas denitration, terminal equipment and storage medium |
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