CN107991885A - A kind of coal-burning power plant's denitration spray ammonia autocontrol method and system - Google Patents
A kind of coal-burning power plant's denitration spray ammonia autocontrol method and system Download PDFInfo
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- CN107991885A CN107991885A CN201711456198.4A CN201711456198A CN107991885A CN 107991885 A CN107991885 A CN 107991885A CN 201711456198 A CN201711456198 A CN 201711456198A CN 107991885 A CN107991885 A CN 107991885A
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 150
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 74
- 239000007921 spray Substances 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 12
- 229910000069 nitrogen hydride Inorganic materials 0.000 claims abstract description 43
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 22
- 230000023556 desulfurization Effects 0.000 claims abstract description 20
- 239000003546 flue gas Substances 0.000 claims abstract description 9
- 239000003245 coal Substances 0.000 claims description 15
- 230000008859 change Effects 0.000 claims description 12
- 230000009471 action Effects 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 6
- 239000000523 sample Substances 0.000 claims description 4
- 239000003054 catalyst Substances 0.000 claims description 2
- 230000003197 catalytic effect Effects 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical class [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims description 2
- 229910001928 zirconium oxide Inorganic materials 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims 2
- 210000000038 chest Anatomy 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 4
- 230000006872 improvement Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 230000008569 process Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- BIGPRXCJEDHCLP-UHFFFAOYSA-N ammonium bisulfate Chemical compound [NH4+].OS([O-])(=O)=O BIGPRXCJEDHCLP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004422 calculation algorithm Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000012625 in-situ measurement Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
Classifications
-
- 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
- G05B13/00—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
- G05B13/02—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
- G05B13/04—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators
- G05B13/042—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators in which a parameter or coefficient is automatically adjusted to optimise the performance
-
- 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
-
- 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
- B01D53/76—Gas phase processes, e.g. by using aerosols
-
- 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
- G05D11/131—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means by measuring the values related to the quantity of the individual components
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
-
- 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
Abstract
A kind of coal-burning power plant's denitration spray ammonia autocontrol method and system, are related to field of environment protection in coal-burning power plant's production, and slow in the presence of conventional denitration automatic system tracking in order to solve the prior art, control effect cannot meet field demand, increase denitrating system NH3Escape amount, the NH being sparged into3Amount and NO in flue gasxThe problem of cannot matching, the system include desulfurization outlet NOxAnalyzer, burner hearth O2Sensor, boiler total blast volume sensor, A side entrances NOxAnalyzer, Central Control Module, B side entrances NOxAnalyzer, the first control module, the 3rd control module, the second control module, A side spray ammonia control valve, feeder, B side spray ammonia control valve, A side outlets NOxAnalyzer, A sides Benitration reactor, B sides Benitration reactor and B side outlets NOxAnalyzer；The system reduces the consumption of liquefied ammonia while denitration efficiency is greatly improved, and significantly reduces efficiency improvement cost, improves the automatization level of denitrating system.
Description
Technical field
The present invention relates to field of environment protection in a kind of coal-burning power plant's production process, and in particular to a kind of denitration spray ammonia automatically controls
Method and system.
Background technology
With the raising of state environment protecting standard, environmental protection administration and group company are tighter to denitrating system parameter request
Lattice, denitration situation are increasingly serious.Government department constantly puts into effect new policy and standard, proposes coal unit minimum discharge in the recent period
Standard.Due to NOxDistribution and NH in flue gas air passage3The inhomogeneities of injection, causes NOxCannot be with NH3Substantially uniformity mixes,
Main take sprays into excessive NH3To ensure to export NOxDischarge content, but excessive NH3Can be after escape, and in flue gas
SO3Under certain condition, reaction generation NH4HSO4, NH4HSO4With stronger viscosity and corrosivity, it is most likely that can cause
The blocking of air preheater and electric precipitation polar curve wrap up in ash, serious threat unit safety operation.Denitrating system routine autocontrol method
It is to set trace point as unilateral denitration efficiency, it is impossible to directly embody denitration outlet NOxContent.Unilateral efficiency=(unilateral entrance
NOxContent (conversion)-single side outlet NOxContent (conversion))/one side entrance NOxContent (conversion) * 100%, unilateral denitration efficiency
Include following 4 variables：Entrance NOxContent (origin), entrance oxygen amount, outlet NOxContent (origin), outlet oxygen amount.Participate in adjusting
Variable it is excessive, cause regulation quality deviation.In NOxDuring content conversion, standard oxygen value is 6, when oxygen amount is in 6 neighbouring ripples
When dynamic, have a great influence, and oxygen amount is determined by air and flue system, denitrating system can not be adjusted.In self-regulating process, when efficiency
When set-point difference occurs with actual value, spray ammonia control valve can reduce direction action to the difference of set-point and actual value；But
It is, if oxygen amount fluctuates at the same time, it is possible to valve opposite direction can be caused to act；Equally, as unilateral entrance NOxWhen content raises, together
Side outlet NOxThe content short time will not change, unilateral efficiency rise, and according to existing logic, denitration spray ammonia control valve can close
It is small, but due to unilateral entrance NOxContent rise sprays ammonia control valve, it is necessary to open big denitration, to ensure unilateral efficiency, so sprays ammonia
Control valve direction of action is on the contrary, eventually influence the correctness of adjusting action.So conventional denitration automatic system tracking is slow,
Control effect cannot meet field demand, increase denitrating system NH3Escape amount, the NH being sparged into3Amount and NO in flue gasxCannot
Match somebody with somebody.To ensure that discharge nitrogen oxides in effluent content is not exceeded, operations staff must not infrequently intervene manually, disperse a large amount of essences
Power, has aggravated operating burden.
The content of the invention
There is conventional denitration automatic system tracking slowly in the present invention, control effect cannot meet scene in order to solve the prior art
Demand, increase denitrating system NH3Escape amount, the NH being sparged into3Amount and NO in flue gasxThe problem of cannot matching, propose a kind of coal-fired
Power plant's denitration spray ammonia autocontrol method and system.
Technical scheme is as follows：
A kind of coal-burning power plant's denitrating system automatic control system, it is characterized in that, which includes desulfurization outlet NOxAnalysis
Instrument, burner hearth O2Sensor, boiler total blast volume sensor, A side entrances NOxAnalyzer, Central Control Module, B side entrances NOxAnalysis
Instrument, the first control module, the 3rd control module, the second control module, A side spray ammonia control valve, feeder, B side sprays ammonia are adjusted
Valve, A side outlets NOxAnalyzer, A sides Benitration reactor, B sides Benitration reactor and B side outlets NOxAnalyzer；Desulfurization exports
NOxAnalyzer, burner hearth O2Sensor and boiler total blast volume sensor are connected with Central Control Module；Central Control Module is distinguished
It is connected with the first control module, the second control module and the 3rd control module；A side entrances NOxAnalyzer and A side outlets NOxAnalysis
Instrument is connected with the first control module, the first control module with A side spray ammonia control valves respectively；B side entrances NOxAnalyzer and B sides
Export NOxAnalyzer is connected with the second control module, the second control module with B side spray ammonia control valves respectively；3rd control mould
Block is connected with feeder；A side spray ammonia control valves are connected with A sides Benitration reactor, and B side spray ammonia control valves take off with B sides respectively
Nitre reactor connects；A sides Benitration reactor and A side outlets NOxAnalyzer connects, B sides Benitration reactor and B side outlets NOxAnalysis
Instrument connects.
Ammonia autocontrol method is sprayed in a kind of coal-burning power plant's denitration, it is characterized in that, it comprises the following steps：
The first step, desulfurization outlet NOxAnalyzer detects current desulfurization outlet NOxContent, burner hearth O2Sensor detects burner hearth
Internal O2Content, boiler total blast volume sensor detection burner hearth inside total blast volume, and desulfurization is exported into NO respectivelyxContent, burner hearth O2
Amount, boiler total blast volume are sent to Central Control Module, and Central Control Module is responsible for receiving three parameters and discharge gas NOxContent
Setting value and unit load signal and current coal quality COEFFICIENT K, A side entrances NOxAnalyzer and B side entrances NOxAnalyzer is examined respectively
Measure A, B side entrance NOxContent, and correspondence inputs to the first control module and the second control module respectively；
Second step, Central Control Module is according to intrinsic function relation：Entrance NOxContent=(A side entrances NOxContent+B sides enter
Mouth NOxContent)/2, total flue gas flow=boiler total blast volume/1.338, NOxTotal amount=(entrance NOxContent-outlet NOxContent is set
Definite value) * (21-6)/(21- burner hearths O2Amount) * boilers total blast volume/1.338*K, NH3Aggregate demand=NOxTotal amount * 0.37, obtains
To spray ammonia change instruction, and the first control module, the second control module and the 3rd control module are given in output control instruction respectively；
3rd step, A side outlets NOxAnalyzer and B side outlets NOxAnalyzer, it is corresponding respectively to detect A side Benitration reactors and B
The NO of side Benitration reactor outletxContent；First control module intrinsic function relation：A sides NH3Demand=NH3Aggregate demand *
Ka, A side NH3Changes in demand amount=A sides NH3The differential of demand；Polygronal function A：A sides NH3Changes in demand amount is X-axis, A side sprays
Ammonia controlling opening of valve, which becomes, turns to Y-axis；First control module combines the output of its intrinsic function and Central Control Module, draws finger
Order acts on A side spray ammonia control valves, it is made instruction action corresponding with needing ammonia amount, changes ammonia spraying amount, adjusts A side outlets
NOxContent forms close loop control circuit to setting value；Second control module intrinsic function relation：B sides NH3Demand=NH3Always
Demand * Kb, B side NH3Changes in demand amount=B sides NH3The differential of demand；Polygronal function B：B sides NH3Changes in demand amount is X
Axis, B side spray ammonia controlling opening of valve, which becomes, turns to Y-axis；Second control module combines the defeated of its intrinsic function and Central Control Module
Go out, show that instruction acts on B side spray ammonia control valves, it is made instruction action corresponding with needing ammonia amount, change ammonia spraying amount, adjust
Save B side outlets NOxContent forms close loop control circuit to setting value；Wherein, Ka+Kb=1, Ka are A crosswind coefficient of discharges, Kb B
Crosswind coefficient of discharge；
4th step, the 3rd control module are responsible for the instruction sent according to master controller, and coal-supplying amount coal is carried out to feeder
Layer arrangement is adjusted, and A sides Benitration reactor and B sides denitration reactor inlet temperature is more than 320 DEG C, is ensured urging for denitrating catalyst
Change temperature；
5th step, the first control module and the second control module independently control the denitration of A, B side, and mould is controlled with reference to center
The output of block, it is overall to form a control.
The beneficial effects of the invention are as follows：
Denitrating system is divided into A, B two parts, two parts are independently controlled adjusting, and export NO with desulfurizationxContent,
Burner hearth O2Amount and boiler total blast volume, current unit load, current coal quality situation pass through Central Control Module as real-time input quantity
Control instruction is sent, then execution control is carried out by subordinate's control module.Such a system mode is realized according to unit load, burner hearth
O2Amount, entrance NOxContent, outlet NOxEach operation ginseng of the different kinds of parameters such as content change adjust automatically denitration spray ammonia control valve
Number, accelerates denitrating system to NOxThe response speed of changes of contents, so as to preferably ensure that discharge is less than national standard in real time.
Meanwhile denitration spray ammonia automatic control system proposed by the present invention, for many coal-burning power plants, it is only necessary to which desulfurization is exported
NOxAnalyzer, burner hearth O2Sensor and boiler total blast volume sensor install a set of signal transmission system, original In situ Measurement additional respectively
Device can also be retained, and while denitration efficiency is greatly improved, reduced the consumption of liquefied ammonia, significantly reduced efficiency
Improvement cost, significantly reduces the operating pressure of power plant operations staff, improves the automatization level of denitrating system entirety.
Brief description of the drawings
Fig. 1 sprays ammonia automatic control system structure diagram for a kind of coal-burning power plant's denitration.
Embodiment
The present invention is described in further details below in conjunction with the accompanying drawings：
As shown in Figure 1, a kind of coal-burning power plant's denitrating system automatic control system, which includes desulfurization outlet NOxAnalysis
Instrument 1, burner hearth O2Sensor 2, boiler total blast volume sensor 3, A side entrances NOxAnalyzer 4, Central Control Module 5, B side entrances NOx
Analyzer 6, the first control module 7, the 3rd control module 8, the second control module 9, A side spray ammonia control valve 10, feeder 11,
B side spray ammonia control valve 12, A side outlets NOxAnalyzer 13, A sides Benitration reactor 14, B sides Benitration reactor 15 and B side outlets
NOxAnalyzer 16；Desulfurization exports NOxAnalyzer 1, burner hearth O2Sensor 2 and boiler total blast volume sensor 3 control mould with center
Block 5 connects；Central Control Module 5 is connected with the first control module 7, the second control module 9 and the 3rd control module 8 respectively；A sides
Entrance NOxAnalyzer 4 and A side outlets NOxAnalyzer 13 respectively with the first control module 7, the first control module 7 and A side spray ammonia tune
Section valve 10 connects；B side entrances NOxAnalyzer 6 and B side outlets NOxAnalyzer 16 is controlled with the second control module 9, second respectively
Module 9 is connected with B side spray ammonia control valve 12；3rd control module 8 is connected with feeder 11；A side spray ammonia control valve 10 and A
Side Benitration reactor 14 connects, and B side spray ammonia control valve 12 is connected with B sides Benitration reactor 15 respectively；A sides Benitration reactor 14
With A side outlets NOxAnalyzer 13 connects, B sides Benitration reactor 15 and B side outlets NOxAnalyzer 16 connects.
A kind of coal-burning power plant's denitrating system automatically controls control method, it comprises the following steps：
The first step, desulfurization outlet NOxAnalyzer 1 detects current desulfurization outlet NOxContent, burner hearth O2Sensor 2 detects stove
O inside thorax2Content, boiler total blast volume sensor 3 detects total blast volume inside burner hearth, and desulfurization is exported NO respectivelyxContent, burner hearth
O2Amount, boiler total blast volume are sent to Central Control Module 5, and Central Control Module 5 is responsible for receiving three parameters and discharge gas NOx
Content setting value and unit load signal and current coal quality COEFFICIENT K, A side entrances NOxAnalyzer 4 and B side entrances NOxAnalyzer 6
A, B side entrance NO are detected respectivelyxContent, and correspondence inputs to the first control module 7 and the second control module 8 respectively.
Second step, Central Control Module 5 is according to intrinsic function relation：Entrance NOxContent=(A side entrances NOxContent+B sides
Entrance NOxContent)/2, total flue gas flow=boiler total blast volume/1.338, NOxTotal amount=(entrance NOxContent-outlet NOxContent
Setting value) * (21-6)/(21- burner hearths O2Amount) * boilers total blast volume/1.338*K, NH3Aggregate demand=NOxTotal amount * 0.37,
Spray ammonia change instruction is obtained, and output control is instructed to the first control module 7, the second control module 9 and the 3rd control mould respectively
Block 8.
3rd step, A side outlets NOxAnalyzer 13 and B side outlets NOxAnalyzer 16, detects A sides Benitration reactor 14 respectively
The NO exported with B sides Benitration reactor 15xContent.First control module, 7 intrinsic function relation：A sides NH3Demand=NH3Always need
The amount of asking * Ka, A side NH3Changes in demand amount=A sides NH3The differential of demand；Polygronal function A：A sides NH3Changes in demand amount (X-axis)=
[- 20, -15, -10, -5, -1,0,1,5,10,15,20], 10 aperture of A side spray ammonia control valve change (Y-axis)=[- 10, -
7.5, -5, -3, -0.75,0,0.75,3,5,7.5,10].First control module 7 combines its intrinsic function and Central Control Module 5
Output information, show that instruction acts on A side spray ammonia control valve 10, it is made instruction action corresponding with needing ammonia amount, change
Become ammonia spraying amount, adjust A side outlets NOxContent forms close loop control circuit to setting value.Second control module, 9 intrinsic function closes
System：B sides NH3Demand=NH3Aggregate demand * Kb, B side NH3Changes in demand amount=B sides NH3The differential of demand；Polygronal function
B：B sides NH3Changes in demand amount (X-axis)=[- 20, -15, -10, -5, -1,0,1,5,10,15,20], B side spray ammonia control valve 10
Aperture changes (Y-axis)=[- 10, -7.5, -5, -3, -0.75,0,0.75,3,5,7.5,10].Second control module 9 is combined in it
The output of portion's function and Central Control Module 5, show that instruction acts on B side spray ammonia control valve 12, it is made and need ammonia amount
Corresponding instruction action, changes ammonia spraying amount, adjusts B side outlets NOxContent forms close loop control circuit to setting value.Wherein, Ka
+ Kb=1, Ka are A crosswind coefficient of discharges, and Kb is B crosswind coefficient of discharges.
4th step, the 3rd control module 8 are responsible for the instruction sent according to master controller 5, feeder 11 are carried out to coal
Measure coal seam arrangement to adjust, A sides Benitration reactor 14 and 15 inlet temperature of B sides Benitration reactor is more than 320 DEG C, ensure that denitration is urged
The catalytic temperature of agent.
5th step, the first control module 7 and the second control module 9 independently control the denitration of A, B side, are controlled with reference to center
The output of module 5, forms a control entirety, improves Control platform, keep preferable stationarity, accuracy.
This programme is to export NO with desulfurizationxContent, burner hearth O2Amount, boiler total blast volume, A side entrances NOxContent, A side outlets
NOxContent, B side entrances NOxContent, B side outlets NOxContent is as control variable, with reference to default control in Central Control Module 5
Simulation：Entrance NOxContent=(A side entrances NOxContent+B side entrance NOxContent)/2, total flue gas flow=boiler total blast volume/
1.338 NOxTotal amount=(entrance NOxContent-outlet NOxContent setting value) * (21-6)/(21- burner hearths O2Amount) * boilers
Total blast volume/1.338*K, NH3Aggregate demand=NOxTotal amount * 0.37, realizes and exports NO to denitrating systemxContent it is real-time accurate
Adjust, significantly reduce the problem of discharge is instantaneous out-of-limit, ensure that making full use of for ammonia, improve the efficiency of denitrating system.
When coal quantity is poor, A side entrances NOxAnalyzer 4 and B side outlets NOxAnalyzer 6, can detect NOx
Content increases, so as to increase the aperture of A side spray ammonia control valve 10 and B side spray ammonia control valve 12；When coal quantity is preferable
When, A side entrances NOxAnalyzer 4 and B side outlets NOxAnalyzer 6, can detect NOxThe reduction of content, so as to reduce A sides
Spray the aperture of ammonia control valve 10 and B side spray ammonia control valve 12；
When unit raises load, the first control module 7 and the second control module can be according to Central Control Module 5
Instruction, increases the aperture of A side spray ammonia control valve 10 and B side spray ammonia control valve 12；When unit reduces load, first
7 and second control module of control module can reduce A side spray ammonia control valve 10 and B side sprays according to the instruction of Central Control Module 5
The aperture of ammonia control valve 12；Influence of the disturbance to denitrating system can be thus eliminated, is allowed to continually and steadily run, and drop
The consumption of low liquefied ammonia.
A side entrances NOxAnalyzer 4 and B side entrances NOxAnalyzer 6 is ABB-3020 in-line analyzers, and desulfurization exports NOxPoint
Analyzer 1, A side outlets NOxAnalyzer 13 and B side outlets NOxAnalyzer 16 is Siemens's U23 in-line analyzers, they are to extract
Formula in-line analyzer, sample gas that can be in continuous acquisition denitrating system, the numerical linear detected very well, precision it is very high.
Boiler total blast volume sensor 3 shares 12 sets of self-contained unit compositions, and six sets are distributed at coal pulverizer air passage, remaining six
Set is distributed at secondary air duct, and every suit is all installed on transmitter by measuring probe and formed.Measuring probe is Dalian Seiko instrument
Watch Factory manufactures, and transmitter is 3051 differential pressure model of Rosemount, they are not only simple in structure, are reliable and stable, and be swift in response,
Accuracy is very high.
Burner hearth O2Sensor 2 shares four sets, is distributed on A, B air preheater each two sets, is that U.S.'s AMETEK zirconium oxides are straight
Survey type, can quickly, directly react O inside flake hearth-tapping2The change of amount.
Central Control Module 5 has with boiler load, coal quantity, and the energy of revision directive is sent to subordinate's control module
Power.Because desulfurization can be exported NO by itxContent, burner hearth O2Amount, boiler total blast volume and its internal presetting control-algorithm and function,
Calculation process is together carried out, ensure that final effective object accuracy of action and rapidity.
Since denitrating system inertia is larger, but under the assistance of these reliable, rapid signal supervisory instruments, pass through fortune
With advanced control system, so that it may so that its even running.Under normal operating conditions, automatic full-time throwing can be really realized
Enter, alleviate the monitoring pressure of operations staff, nonserviceable and release under automatic condition, only need to will export NOxContent is adjusted manually
To setting value, throw again automatic, you can stable operation.After denitrating system automatic system puts into operation, NO can be accurately controlledx's
Discharge capacity, reduces the consumption of liquefied ammonia, realizes economic discharge.
The economic benefit obtained using the control system and control method：
Basic consumption ammonia brief account situation under the conditions of routine is automatic：Single unit annual load is about 180MW, and air quantity is
750t/h, entrance NOxAnnual content is 300mg/Nm3, denitration outlet NOxSetting value is 30mg/Nm3。
Unit consumes NH per hour3=(300-30) * 750/1.338*0.37=56kg/h.
Unit consumes NH daily3=56*24=1344kg.
If input is former automatic, export instability scope is larger, and it is about 30mg/Nm to be exported to fluctuation3。
Unit per hour more consumes NH3=30*750/1.338*0.37=6.22kg/h.
Unit daily more consumes NH3=6.22*24=150kg.
If the annual operation of one unit of power plant 365 days, another unit operation calculates for 190 days：
Former power plant consumes NH every year3=1494* (365+190)=829170kg=829.17t.
Existing power plant consumes NH every year3=1344* (365+190)=745920kg=745.92t.
Power plant reduces consumption NH every year3=150* (365+190)=83259kg=83.25t.
Power plant consumes NH3Reduce=83.25/ (83.25+745.92) * 100%=10%.
Claims (6)
1. a kind of coal-burning power plant's denitrating system automatic control system, it is characterized in that, which includes desulfurization outlet NOxAnalyzer
(1), burner hearth O2Sensor (2), boiler total blast volume sensor (3), A side entrances NOxAnalyzer (4), Central Control Module (5), B
Side entrance NOxAnalyzer (6), the first control module (7), the 3rd control module (8), the second control module (9), A side spray ammonia tune
Save valve (10), feeder (11), B side spray ammonia control valves (12), A side outlets NOxAnalyzer (13), A sides Benitration reactor
(14), B sides Benitration reactor (15) and B side outlets NOxAnalyzer (16)；Desulfurization exports NOxAnalyzer (1), burner hearth O2Sensor
(2) it is connected with boiler total blast volume sensor (3) with Central Control Module (5)；Central Control Module (5) is controlled with first respectively
Module (7), the second control module (9) and the connection of the 3rd control module (8)；A side entrances NOxAnalyzer (4) and A side outlets NOxPoint
Analyzer (13) is connected with the first control module (7), the first control module (7) with A side spray ammonia control valves (10) respectively；B sides enter
Mouth NOxAnalyzer (6) and B side outlets NOxAnalyzer (16) respectively with the second control module (9), the second control module (9) and B sides
Spray ammonia control valve (12) connection；3rd control module (8) is connected with feeder (11)；A side spray ammonia control valves (10) and A sides
Benitration reactor (14) connects, and B side spray ammonia control valves (12) are connected with B sides Benitration reactor (15) respectively；A sides denitration reaction
Device (14) and A side outlets NOxAnalyzer (13) connects, B sides Benitration reactor (15) and B side outlets NOxAnalyzer (16) connects.
A kind of 2. coal-burning power plant's denitrating system automatic control system according to claim 1, it is characterised in that the total wind of boiler
Quantity sensor (3) shares 12 covering devices composition, and six covering devices are distributed at coal pulverizer air passage, remaining six covering device is distributed in two
At secondary air passage, each covering device is installed on transmitter by measuring probe and formed.
A kind of 3. coal-burning power plant's denitrating system automatic control system according to claim 1, it is characterised in that burner hearth O2Pass
Sensor 2 shares four sets, is distributed on A, B air preheater each two sets, is U.S.'s AMETEK zirconium oxides directly survey type.
A kind of 4. coal-burning power plant's denitrating system automatic control system according to claim 1, it is characterised in that A side entrances
NOxAnalyzer (4) and B side entrances NOxAnalyzer (6) is ABB-3020 in-line analyzers.
5. a kind of coal-burning power plant's denitrating system automatic control system according to claim 1, it is characterised in that desulfurization exports
NOxAnalyzer (1), A side outlets NOxAnalyzer (13) and B side outlets NOxAnalyzer (16) is Siemens's U23 in-line analyzers.
6. a kind of coal-burning power plant's denitrating system automatically controls control method, it is characterized in that, it comprises the following steps：
The first step, desulfurization outlet NOxAnalyzer (1) detects current desulfurization outlet NOxContent, burner hearth O2Sensor (2) detects stove
O inside thorax2Content, boiler total blast volume sensor (3) detection burner hearth inside total blast volume, and desulfurization is exported into NO respectivelyxContent, stove
Thorax O2Amount, boiler total blast volume are sent to Central Control Module (5), and Central Control Module (5) is responsible for receiving three parameters and discharge
Gas NOxContent setting value and unit load signal and current coal quality COEFFICIENT K, A side entrances NOxAnalyzer (4) and B side entrances
NOxAnalyzer (6) detects A, B side entrance NO respectivelyxContent, and corresponding the first control module (7) and second that inputs to is controlled respectively
Molding block (8)；
Second step, Central Control Module (5) is according to intrinsic function relation：Entrance NOxContent=(A side entrances NOxContent+B sides enter
Mouth NOxContent)/2, total flue gas flow=boiler total blast volume/1.338, NOxTotal amount=(entrance NOxContent-outlet NOxContent is set
Definite value) * (21-6)/(21- burner hearths O2Amount) * boilers total blast volume/1.338*K, NH3Aggregate demand=NOxTotal amount * 0.37, obtains
To spray ammonia change instruction, and output control instruction is respectively to the first control module (7), the second control module (9) and the 3rd control
Module (8)；
3rd step, A side outlets NOxAnalyzer (13) and B side outlets NOxAnalyzer (16), it is corresponding respectively to detect A sides denitration reaction
Device (14) and the NO of B sides Benitration reactor (15) outletxContent；First control module (7) intrinsic function relation：A sides NH3Demand
Amount=NH3Aggregate demand * Ka, A side NH3Changes in demand amount=A sides NH3The differential of demand；Polygronal function A：A sides NH3Demand becomes
Change amount is X-axis, and A side spray ammonia control valve (10) aperture, which becomes, turns to Y-axis；First control module (7) combines its intrinsic function with
The output of heart control module (5), show that instruction acts on A side spray ammonia control valves (10), it is made with needing ammonia amount corresponding
Instruction action, changes ammonia spraying amount, adjusts A side outlets NOxContent forms close loop control circuit to setting value；Second control module
(9) intrinsic function relation：B sides NH3Demand=NH3Aggregate demand * Kb, B side NH3Changes in demand amount=B sides NH3Demand
Differential；Polygronal function B：B sides NH3Changes in demand amount is X-axis, and B side spray ammonia control valve (10) aperture, which becomes, turns to Y-axis；Second control
Molding block (9) combines the output of its intrinsic function and Central Control Module (5), show that instruction acts on B side spray ammonia control valves
(12), it is made instruction action corresponding with needing ammonia amount, change ammonia spraying amount, adjust B side outlets NOxContent is to setting value, shape
Into close loop control circuit；Wherein, Ka+Kb=1, Ka are A crosswind coefficient of discharges, and Kb is B crosswind coefficient of discharges；
4th step, the 3rd control module (8) are responsible for the instruction that is sent according to master controller (5), feeder (11) is carried out to
The arrangement of coal amount coal seam is adjusted, and A sides Benitration reactor (14) and B sides Benitration reactor (15) inlet temperature is more than 320 DEG C, is ensured
The catalytic temperature of denitrating catalyst；
5th step, the first control module (7) and the second control module (9) independently control A, B side denitration, are controlled with reference to center
The output of module (5), it is overall to form a control.
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