CN109603525A - A kind of denitration subregion spray ammonia control method based on unevenness judgement - Google Patents
A kind of denitration subregion spray ammonia control method based on unevenness judgement Download PDFInfo
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 270
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 134
- 239000007921 spray Substances 0.000 title claims abstract description 90
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000001105 regulatory effect Effects 0.000 claims abstract description 31
- 238000005507 spraying Methods 0.000 claims abstract description 31
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000003546 flue gas Substances 0.000 claims abstract description 19
- 238000005070 sampling Methods 0.000 claims abstract description 13
- 239000003245 coal Substances 0.000 claims description 25
- 230000003321 amplification Effects 0.000 claims description 15
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 15
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 12
- 239000001301 oxygen Substances 0.000 claims description 12
- 229910052760 oxygen Inorganic materials 0.000 claims description 12
- 238000004458 analytical method Methods 0.000 claims description 6
- 239000002131 composite material Substances 0.000 claims description 6
- 238000013507 mapping Methods 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 claims description 5
- 238000010304 firing Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 230000033228 biological regulation Effects 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000012790 confirmation Methods 0.000 claims description 3
- 238000005192 partition Methods 0.000 claims description 3
- 238000009790 rate-determining step (RDS) Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 4
- 239000003054 catalyst Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000010790 dilution Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 230000009615 deamination Effects 0.000 description 1
- 238000006481 deamination reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
-
- 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
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
-
- 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
- B01D53/8696—Controlling the catalytic process
Abstract
The present invention relates to the automation control in coal-fired power generator set field, especially a kind of denitration subregion based on unevenness judgement sprays ammonia control method.Existing automatic denitration subregion spray ammonia control is not able to satisfy spray ammonia regulating valve and automatically adjusts needs in real time, and ammonia spraying amount control has delay lag, and ammonia spraying amount and NOx concentration matching are bad, and reactor outlet NOx control effect is poor.The present invention provides a kind of denitration subregion spray ammonia control method based on unevenness judgement, this method divides several spray ammonia subregions by trend according to SCR reactor outlet NOx concentration level, the extended position sampling flue gas of each spray ammonia subregion is corresponded in flue, calculate the unevenness CV of flue sampling section NOx concentration, it is distributed in conjunction with each region ammonia spraying amount size and NOx concentration, subregion spray ammonia regulating valve and spray ammonia branch regulating valve are precisely adjusted according to different condition, meet ammonia spraying amount and NOx concentration matching needs, in real time, quickly, stable and effectively realization SCR denitration reaction device outlet NOx is accurately controlled and is uniformly distributed.
Description
Technical field
The present invention relates to the automation control in coal-fired power generator set field, it is especially a kind of based on unevenness judgement
Denitration subregion sprays ammonia control method.
Background technique
The thermal power plant of China's coal fired power generation mostly uses greatly selective catalytic reduction (SCR) denitration technology to administer NOx pollutant.
The core equipment of SCR denitration technology is SCR reactor, as shown in Figure 1, the process flow of SCR denitration reaction is as follows: from economizer
Former flue gas out first mixes at subregion ammonia-spraying grid with by diluted ammonia, and the ammonia-spraying grid is evenly arranged by several
Nozzle form (referring to fig. 2), a Hand-operated butterfly valve is installed to adjust the ammonia spraying amount size in a region in each spray ammonia branch road,
For mixed flue gas again vertically through SCR reactor, reactor is interior to arrange two layers or three layers of catalyst, mixed flue gas containing ammonia
It is contacted with catalyst surface, wherein in catalyst surface the N2 and water that reduction reaction generates environmental sound occur for NOx and NH3,
To achieve the purpose that remove NOx in flue gas, therefore the uniform concentration distribution of NOx configures aforementioned ammonia-spraying grid in former flue gas
Denitration reaction under mode is normally carried out particularly significant, the existing valve for spraying ammonia control system and once adjusting ammonia-spraying grid valving station
After door opening size, just no longer adjusted in follow-up operation.The ammonia of the area denitration reaction Zhong Youan supply is first sent with dilution air
Dilution wind mixing after, then by spray ammonia branch road Hand-operated butterfly valve after again uniformly spray into flue in original flue gas mixes.For
In ammonia main pipe ammonia straying quatity number will according to unit load, former flue gas NOx concentration value and the denitration efficiency that need to reach from
It is dynamic to adjust, when denitration efficiency is more demanding, ammonia spraying amount can be increased, then reduces ammonia spraying amount when deamination requires lower；In load
Uniformly whether one timing, the quality of Benitration reactor operating status depend under a certain operating condition fixing ammonia spraying amount on spraying into section
And reasonable distribution, ideally former flue gas NOx is evenly distributed and flow velocity is consistent, only need to guarantee uniformly to spray into ammonia on section
, it is adjusted without each Hand-operated butterfly valve state to spray ammonia branch road, this is also that current all coal units are de-
Nitre system is by the way of.
In actual operation, since the uniformity that NOx is distributed in former flue gas is poor, the boiler of especially opposed firing mode exists
The NOx regularity of distribution of former flue gas can all have greatly changed in coal pulverizer handoff procedure and after switching, especially coal pulverizer
After switching or load variations, since the Hand-operated butterfly valve aperture to each spray ammonia branch does not adjust, cause flue in actual motion each
Region ammonia spraying amount size is not matched that with the distribution of NOx actual concentrations, is in turn resulted on denitration exit NOx concentration monitor value and chimney
There are relatively large deviation between concentration monitor value, in operation amount of ammonia slip increase, the equipment blocking such as air preheater, blower unit consumption increase with
And the problems such as unit output reduction." one kind is suitable for firing stamp the patent application of earlier application number 2016106049468
The denitration Precise control method of coal burning boiler " discloses a kind of can change according to the operating status of load and coal pulverizer and changes for ammonia
The quick adjusting of branch control valve opening, but this control is not still able to satisfy the real-time control to spray ammonia regulating valve；And
Since the lag of SCR denitration reaction device inlet and outlet NOx concentration measurement and the self-characteristic of control system make denitrating system ammonia spraying amount
Control process becomes a big time delay process, and automatic control is caused to be difficult to obtain expected good result, especially ammonia spraying amount and NOx
Concentration matching effect is not good enough.In addition, throwings is cut in unit load fluctuation, Coal pulverizer, reactor inlet NOx fluctuating range is greatly and wave
Dynamic fast speed, these can all seriously affect the control effect of reactor outlet NOx.
Summary of the invention
The technical problem to be solved in the present invention and the technical assignment of proposition are to overcome existing automatic denitration subregion spray ammonia control
It is not able to satisfy that spray ammonia regulating valve automatically adjust in real time and ammonia spraying amount control has obvious delay and lags, leads to ammonia spraying amount and NOx
The problems such as concentration matching is bad, and reactor outlet NOx control effect is poor provides a kind of denitration subregion based on unevenness judgement
Ammonia control method is sprayed, each region of unevenness CV combination flue that flue can be sampled section NOx concentration by the controller is sprayed
Ammonia amount size and NOx concentration distribution precisely to adjust subregion spray ammonia regulating valve and spray ammonia branch regulating valve, meet ammonia spraying amount and NOx
Concentration matching needs, real-time, quick, stabilization and effectively realization SCR denitration reaction device export NOx and accurately control and be uniformly distributed.
The present invention solves the technical solution that technical problem uses: a kind of denitration subregion spray ammonia control based on unevenness judgement
Method processed, including the following steps sequentially carried out:
(1) electric control valve with automatic regulation function is set as spray ammonia branch regulating valve in each spray ammonia branch；
(2) confirmation ammonia sprays into district location corresponding to the ammonia-spraying grid of section, and by region corresponding to each spray ammonia branch
Fix number, and will have the valve opening of n spray ammonia branch to be defined as Y=(y11, y12, y13, y21, y22, y23 ...
Yij ... yhm), yij is the corresponding control valve opening size of i-th group of j-th of spray ammonia branch, the valve of every three sprays ammonia branch
It is one group, j and m value is 1,2, the integral multiple that 3, n is 3；
(3) several spray ammonia subregions are divided by trend according to SCR reactor outlet NOx concentration level, and the division of subregion is pressed
Spray ammonia number of branches evenly distribute, and a subregion is arranged for ammonia regulating valve in each spray ammonia subregion；
(4) number is fixed to each subregion coefficient amplification module in subregion spray ammonia control system, each coefficient is put
The definition of big module Proportional coefficient K is K=(k1, k2, k3 ... kM), and M is the spray ammonia number of partitions；
(5) assume that the boiler of certain opposed firing has 5 coal pulverizers, respectively A mill, B mill, C mill, D mill and E mill, by pot
Furnace coal pulverizer run signal and unit load W are defined as variable X, wherein load combination actual conditions be divided into two load section W1,
W2, more than minimum technology power output, when unit keeps at least 3 coal pulverizer operations, coal pulverizer runs composite condition discretization are as follows:
It is hereby achieved that vector:
X=(X1, X2, X3Xn)；
(6) under every kind of coal pulverizer operating condition, by ammonia-spraying grid method of adjustment manually adjust it is each spray ammonia branch for ammonia
Amount size obtains so that denitration outlet NOx concentration is evenly distributed for ammonia branch road valve aperture Y, coefficient amplification module ratio
Functional relation between COEFFICIENT K and coal pulverizer operation composite condition X:
Y=F (X), K=G (X)；
(7) pass through following rate-determining steps cycle calculations and adjust motor and adjust subregion for ammonia regulating valve or spray ammonia branch adjusting
The aperture of valve；
(71) first in setting procedure, give the setting value of exit NOx concentration, the NOx concentration be 273.15K, 1.013 ×
Under 105Pa situation when 6% oxygen amount NOx concentration scaled value, then enter timing module；
(72) pulse signal of one " Y " is given by setting time in timed step, and judges mould into unevenness
Block；Otherwise " N " signal is given always, and skips unevenness judgment module, is directly entered the second to the 5th deviation computing module；
(73) when timing module gives " Y " signal, system enters unevenness determination module；Mould is determined in unevenness
Block receives the CV signal that passes over of computing module, judges whether it is less than or equal to 15%, be enter if " Y " second to
5th deviation computing module；Otherwise " N " and by mapping F (X) quickly adjust spray ammonia branch regulating valve；
(74) in first to fourth deviation computing module, the PVn of computing module output is inputted respectively, wherein n=1,2,3,4
And the NOx setting value given in setting procedure；Calculate separately to obtain deviation △ 1, △ 2, △ 3, △ 4 and it is corresponding enter first to
4th coefficient amplification module；
(75) in first to fourth coefficient amplification module, K and the 4th that corresponding input mapping G (X) determines) step obtains
△, the K are respectively k1, k2, k3, k4, and the △ is respectively △ 1, △ 2, △ 3, △ 4, in four coefficient amplification modules
Middle carry out ratio calculating exports k1 △ 1, k2 △ 2, k3 △ 3, k4 △ 4 respectively and enters four pid control modules；
(76) input of each pid control module is respectively k1 △ 1, k2 △ 2, k3 △ 3, k4 △ 4 and zero, from there through
Motor is adjusted to adjust subregion for the aperture of ammonia regulating valve；
(77) the extended position sampling flue gas of each spray ammonia subregion is corresponded on the flue after Benitration reactor, it is defeated
Out to sample collection analysis module, NOx concentration Cs, oxygen amount O are obtained to acquire flue gas in real time and analyze2%, temperature Ts, water capacity
Then Xs transfers data to computing module and is calculated；
(78) in computing module, the initial data that sampling analysis is obtained is calculated by the following formula 273.15K, 1.013
Under × 105Pa situation when 6% oxygen amount NOx oxygen amount reduced value Csn, and by subregion spray ammonia control system be calculated each point
Area corresponds to NOx concentration PVn (n=1,2,3in), the average value P V of entire section NOx concentration, sampling section
The unevenness CV of NOx concentration；
In the i-th subregion:
PVi=Csn
The SP is reactor outlet NOx concentration setting value；CV, %；PV, mg/Nm3；
(79) PVn, PV and CV that computing module obtains are transferred to host computer, wherein PVn point all the way to first to the
Four deviation computing modules, CV points are arrived unevenness judgment module all the way.
The present invention provides it is a kind of based on unevenness judgement denitration subregion spray ammonia control method, the control method according to
Several spray ammonia subregions are divided by trend according to SCR reactor outlet NOx concentration level, each spray ammonia subregion is then corresponded in flue
Extended position sample flue gas, calculate flue sampling section NOx concentration unevenness CV, in conjunction with each region ammonia spraying amount size with
NOx concentration distribution, according to different condition precisely adjust subregion spray ammonia regulating valve and spray ammonia branch regulating valve, meet ammonia spraying amount and
NOx concentration matching needs, in real time, quickly, it is stable and effectively realize that SCR denitration reaction device outlet NOx accurately control and uniformly divided
Cloth, specifically using unevenness CV 15% as critical point, is quickly adjusted when being greater than 15% referring to first patent application and sprays ammonia
Branch regulating valve is less than or equal to adjust subregion for ammonia regulating valve when 15%.
Detailed description of the invention
Fig. 1: the present invention is to denitration ammonia-spraying grid subregion and refines the schematic diagram of adjustment.
Fig. 2: control method flow diagram of the present invention.
Fig. 3: present invention schematic diagram on SCR reactor.
Specific embodiment
The present invention is described further with specific embodiment for explanation with reference to the accompanying drawing.
As shown in Figures 1 to 3, a kind of denitration subregion based on unevenness judgement sprays ammonia control method, including sequentially carries out
Following steps:
(1) electric control valve with automatic regulation function is set as spray ammonia branch regulating valve in each spray ammonia branch；
(2) confirmation ammonia sprays into district location corresponding to the ammonia-spraying grid of section, and by region corresponding to each spray ammonia branch
Fix number, and will have the valve opening of n spray ammonia branch to be defined as Y=(y11, y12, y13, y21, y22, y23 ...
Yij ... yhm), yij is the corresponding control valve opening size of i-th group of j-th of spray ammonia branch, the valve of every three sprays ammonia branch
It is one group, j and m value is 1,2,3；Spray ammonia branch in 24 tunnels is only depicted in Fig. 1, the actual out of stock reactor of SCR is according to unit
Amount of capacity, generally there is 20~40 road branches, is that simplification is not drawn one by one in the present embodiment；
(3) several spray ammonia subregions are divided by trend according to SCR reactor outlet NOx concentration level, and the division of subregion is pressed
Spray ammonia number of branches evenly distribute, and each spray ammonia subregion one subregion of setting is simplified division in the present embodiment for ammonia regulating valve
At 4 spray ammonia subregions shown in Fig. 1；
(4) number is fixed to each subregion coefficient amplification module in subregion spray ammonia control system, each coefficient is put
The definition of big module Proportional coefficient K is K=(k1, k2, k3 ... kM), and M is the spray ammonia number of partitions；
(5) assume that the boiler of certain opposed firing has 5 coal pulverizers, respectively A mill, B mill, C mill, D mill and E mill, by pot
Furnace coal pulverizer run signal and unit load W are defined as variable X, wherein load combination actual conditions be divided into two load section W1,
W2, more than minimum technology power output, when unit keeps at least 3 coal pulverizer operations, coal pulverizer runs composite condition discretization are as follows:
It is hereby achieved that vector:
X=(X1, X2, X3Xn)；
(6) under every kind of coal pulverizer operating condition, by ammonia-spraying grid method of adjustment manually adjust it is each spray ammonia branch for ammonia
Amount size obtains so that denitration outlet NOx concentration is evenly distributed for ammonia branch road valve aperture Y, coefficient amplification module ratio
Functional relation between COEFFICIENT K and coal pulverizer operation composite condition X:
Y=F (X), K=G (X)；
(7) pass through following rate-determining steps cycle calculations and adjust motor and adjust subregion for ammonia regulating valve or spray ammonia branch adjusting
The aperture of valve；
(71) first in setting procedure, give the setting value of exit NOx concentration, the NOx concentration be 273.15K, 1.013 ×
Under 105Pa situation when 6% oxygen amount NOx concentration scaled value, then enter timing module；
(72) pulse signal of one " Y " is given by setting time in timed step, and judges mould into unevenness
Block；Otherwise " N " signal is given always, and skips unevenness judgment module, is directly entered the second to the 5th deviation computing module；
(73) when timing module gives " Y " signal, system enters unevenness determination module；Mould is determined in unevenness
Block receives the CV signal that passes over of computing module, judges whether it is less than or equal to 15%, be enter if " Y " second to
5th deviation computing module；Otherwise " N " and by mapping F (X) quickly adjust spray ammonia branch regulating valve；
(74) in first to fourth deviation computing module, the PVn of computing module output is inputted respectively, wherein n=1,2,3,4
And the NOx setting value given in setting procedure；Calculate separately to obtain deviation △ 1, △ 2, △ 3, △ 4 and it is corresponding enter first to
4th coefficient amplification module；
(75) in first to fourth coefficient amplification module, K and the 4th that corresponding input mapping G (X) determines) step obtains
△, the K are respectively k1, k2, k3, k4, and the △ is respectively △ 1, △ 2, △ 3, △ 4, in four coefficient amplification modules
Middle carry out ratio calculating exports k1 △ 1, k2 △ 2, k3 △ 3, k4 △ 4 respectively and enters four pid control modules；
(76) input of each pid control module is respectively k1 △ 1, k2 △ 2, k3 △ 3, k4 △ 4 and zero, from there through
Motor is adjusted to adjust subregion for the aperture of ammonia regulating valve；
(77) the extended position sampling flue gas of each spray ammonia subregion is corresponded on the flue after Benitration reactor, it is defeated
Out to sample collection analysis module, NOx concentration Cs, oxygen amount O are obtained to acquire flue gas in real time and analyze2%, temperature Ts, water capacity
Then Xs transfers data to computing module and is calculated；
(78) in computing module, the initial data that sampling analysis is obtained is calculated by the following formula 273.15K, 1.013
Under × 105Pa situation when 6% oxygen amount NOx oxygen amount reduced value Csn, and by subregion spray ammonia control system be calculated each point
Area corresponds to NOx concentration PVn (n=1,2,3in), the average value P V of entire section NOx concentration, sampling section
The unevenness CV of NOx concentration；
In the i-th subregion:
PVi=Csn
The SP is reactor outlet NOx concentration setting value；CV, %；PV, mg/Nm3；
(79) PVn, PV and CV that computing module obtains are transferred to host computer, wherein PVn point all the way to first to the
Four deviation computing modules, CV points are arrived unevenness judgment module all the way.
The present invention provides it is a kind of based on unevenness judgement denitration subregion spray ammonia control method, the control method according to
Several spray ammonia subregions are divided by trend according to SCR reactor outlet NOx concentration level, each spray ammonia subregion is then corresponded in flue
Extended position sample flue gas, calculate flue sampling section NOx concentration unevenness CV, in conjunction with each region ammonia spraying amount size with
NOx concentration distribution, according to different condition precisely adjust subregion spray ammonia regulating valve and spray ammonia branch regulating valve, meet ammonia spraying amount and
NOx concentration matching needs, in real time, quickly, it is stable and effectively realize that SCR denitration reaction device outlet NOx accurately control and uniformly divided
Cloth, specifically using unevenness CV 15% as critical point, is quickly adjusted when being greater than 15% referring to first patent application and sprays ammonia
Branch regulating valve is less than or equal to adjust subregion for ammonia regulating valve when 15%.
Claims (1)
1. a kind of denitration subregion based on unevenness judgement sprays ammonia control method, including the following steps sequentially carried out:
(1) electric control valve with automatic regulation function is set as spray ammonia branch regulating valve in each spray ammonia branch；
(2) confirmation ammonia sprays into district location corresponding to the ammonia-spraying grid of section, and region corresponding to each spray ammonia branch is consolidated
The number of delimiting the organizational structure, and will there is the valve opening of n spray ammonia branch to be defined as Y=(y11, y12, y13, y21, y22, y23 ... yij ...
Yhm), yij is the corresponding control valve opening size of i-th group of j-th of spray ammonia branch, and the valve of every three sprays ammonia branch is one
Group, j and m value is 1,2, the integral multiple that 3, n is 3；
(3) several spray ammonia subregions are divided by trend according to SCR reactor outlet NOx concentration level, and the division of subregion is by spray ammonia
Number of branches evenly distribute, and a subregion is arranged for ammonia regulating valve in each spray ammonia subregion；
(4) number is fixed to each subregion coefficient amplification module in subregion spray ammonia control system, each coefficient is amplified into mould
The definition of block Proportional coefficient K is K=(k1, k2, k3 ... kM), M is the spray ammonia number of partitions；
(5) assume that the boiler of certain opposed firing there are 5 coal pulverizers, respectively A mill, B mill, C mill, D mill and E mill grind boiler
Coal machine run signal and unit load W are defined as variable X, and wherein load combination actual conditions are divided into two load sections W1, W2,
More than minimum technology power output, when unit keeps at least 3 coal pulverizer operations, coal pulverizer runs composite condition discretization are as follows:
It is hereby achieved that vector:
X=(X1, X2, X3Xn)；
(6) under every kind of coal pulverizer operating condition, the big for ammonia amount of each spray ammonia branch is manually adjusted by ammonia-spraying grid method of adjustment
It is small, so that denitration outlet NOx concentration is evenly distributed, obtain for ammonia branch road valve aperture Y, coefficient amplification module proportionality coefficient
Functional relation between K and coal pulverizer operation composite condition X:
Y=F (X), K=G (X)；
(7) pass through following rate-determining steps cycle calculations and adjust motor and adjust subregion for ammonia regulating valve or spray ammonia branch regulating valve
Aperture；
(71) setting value of exit NOx concentration first is given in setting procedure, the NOx concentration is 273.15K, 1.013 × 105Pa
Under situation when 6% oxygen amount NOx concentration scaled value, then enter timing module；
(72) pulse signal of one " Y " is given by setting time in timed step, and enters unevenness judgment module；It is no
" N " signal is then given always, and skips unevenness judgment module, is directly entered the second to the 5th deviation computing module；
(73) when timing module gives " Y " signal, system enters unevenness determination module；In unevenness determination module,
The CV signal that passes over of computing module is received, judges whether it is less than or equal to 15%, is to enter second to the 5th if " Y "
Deviation computing module；Otherwise " N " and by mapping F (X) quickly adjust spray ammonia branch regulating valve；
(74) in first to fourth deviation computing module, input the PVn of computing module output respectively, wherein n=1,2,3,4 and
The NOx setting value given in setting procedure；It calculates separately to obtain deviation △ 1, △ 2, △ 3, △ 4 and correspond into first to fourth
Coefficient amplification module；
(75) in first to fourth coefficient amplification module, K and the 4th that corresponding input mapping G (X) determines) the obtained △ of step, institute
Stating K is respectively k1, k2, k3, k4, and the △ is respectively △ 1, △ 2, △ 3, △ 4, is carried out in four coefficient amplification modules
Ratio calculates, and exports k1 △ 1, k2 △ 2, k3 △ 3, k4 △ 4 respectively and enters four pid control modules；
(76) input of each pid control module is respectively k1 △ 1, k2 △ 2, k3 △ 3, k4 △ 4 and zero, from there through adjustment
Motor adjusts subregion for the aperture of ammonia regulating valve；
(77) the extended position sampling flue gas of each spray ammonia subregion is corresponded on the flue after Benitration reactor, output is extremely
Sample collection analysis module obtains NOx concentration Cs, oxygen amount O to acquire flue gas in real time and analyze2%, temperature Ts, water capacity Xs,
Then computing module is transferred data to be calculated；
(78) in computing module, the initial data that sampling analysis is obtained be calculated by the following formula 273.15K, 1.013 ×
Under 105Pa situation when 6% oxygen amount NOx oxygen amount reduced value Csn, and by subregion spray ammonia control system each subregion is calculated
Average value P V, the sampling section NOx of corresponding NOx concentration PVn (n=1,2,3in), entire section NOx concentration
The unevenness CV of concentration；
In the i-th subregion:
PVi=Csn
The SP is reactor outlet NOx concentration setting value；CV, %；PV, mg/Nm3；
(79) PVn, PV and CV that computing module obtains are transferred to host computer, and wherein PVn divides inclined to first to fourth all the way
Poor computing module, CV points are arrived unevenness judgment module all the way.
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|---|---|---|---|
| CN201811607377.8A CN109603525B (en) | 2018-12-27 | 2018-12-27 | Denitration partition ammonia spraying control method based on non-uniformity judgment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811607377.8A CN109603525B (en) | 2018-12-27 | 2018-12-27 | Denitration partition ammonia spraying control method based on non-uniformity judgment |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110568129A (en) * | 2019-09-26 | 2019-12-13 | 北京国电龙源环保工程有限公司 | SCR denitration outlet mixing and partition flue gas NOx concentration detection system and method thereof |
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