CN106345298B - A kind of SCR denitration device, its spray ammonia regulating device and its spray ammonia method of adjustment - Google Patents
A kind of SCR denitration device, its spray ammonia regulating device and its spray ammonia method of adjustment Download PDFInfo
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- CN106345298B CN106345298B CN201610899397.1A CN201610899397A CN106345298B CN 106345298 B CN106345298 B CN 106345298B CN 201610899397 A CN201610899397 A CN 201610899397A CN 106345298 B CN106345298 B CN 106345298B
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 434
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 217
- 239000007921 spray Substances 0.000 title claims abstract description 193
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000001105 regulatory effect Effects 0.000 title claims abstract description 20
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 13
- 238000005070 sampling Methods 0.000 claims description 109
- 238000012806 monitoring device Methods 0.000 claims description 21
- 239000000779 smoke Substances 0.000 claims description 21
- 238000005507 spraying Methods 0.000 claims description 14
- 230000033228 biological regulation Effects 0.000 claims description 8
- 230000007704 transition Effects 0.000 claims description 7
- 238000013461 design Methods 0.000 abstract description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 12
- 239000003546 flue gas Substances 0.000 description 12
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 10
- 230000008859 change Effects 0.000 description 6
- 239000003245 coal Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 239000002956 ash Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 238000000738 capillary electrophoresis-mass spectrometry Methods 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- 238000005192 partition Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000013517 stratification Methods 0.000 description 2
- 230000009897 systematic effect Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- WWILHZQYNPQALT-UHFFFAOYSA-N 2-methyl-2-morpholin-4-ylpropanal Chemical compound O=CC(C)(C)N1CCOCC1 WWILHZQYNPQALT-UHFFFAOYSA-N 0.000 description 1
- 235000002918 Fraxinus excelsior Nutrition 0.000 description 1
- 241001314440 Triphora trianthophoros Species 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
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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
- B01D53/74—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
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- General Chemical & Material Sciences (AREA)
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- Chemical Kinetics & Catalysis (AREA)
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Abstract
The invention discloses a kind of SCR denitration device, its spray ammonia regulating device and its spray ammonia method of adjustment, SCR denitration device spray ammonia regulating device, including spray ammonia main pipe；Spray ammonia main pipe branches into two or more spray ammonia subregion main pipes, and every spray ammonia subregion main pipe branches into two or more spray ammonia branch pipes；It is respectively equipped with spray ammonia manual modulation valve on every spray ammonia branch pipe, spray ammonia district grid valve is respectively equipped in every spray ammonia subregion main pipe, the spray ammonia main pipe Upstream section before non-branch is equipped with the spray total adjustable valve of ammonia.For the present invention by exporting NOx mean concentration to SCR and NOx concentration distribution is monitored, General Promotion sprays the quality of ammonia control, and whole system design aspect focuses on highly integrated, the significant advantages that have that with low investment, reliability is high etc..
Description
Technical field
The present invention relates to large-scale coal fired power plant gas denitrifying technology field more particularly to a kind of SCR denitration devices, its spray ammonia
Regulating device and its spray ammonia method of adjustment.
Background technique
Currently, large-scale coal fired power plant generallys use SCR denitration device to reduce NOx emission concentration in flue gas.SCR is utilized
NH3To the reduction characteristic of NOx, NOx is reduced to the N of environmental sound under the effect of the catalyst2And H2O.In actual motion mistake
The control of Cheng Zhong, ammonia spraying amount are particularly critical, increase ammonia spraying amount and advantageously reduce NOx emission concentration, but the escaping of ammonia rate can increase therewith
Add, and then downstream air preheater is easily caused to block and corrode because of ammonium hydrogen sulfate deposition, it is also possible to cause electric precipitation polar curve dust stratification, remove
Dirt cloth bag sticks the adverse effect such as ash.
In terms of spraying ammonia control, rationally control spray ammonia total amount is on the one hand required, on the other hand requires to guarantee spray ammonia uniformity
(it is relatively uniform to refer mainly to ammonia nitrogen molar ratio), to ensure allowing within the scope of the escaping of ammonia rate, NOx emission concentration is up to standard.
Ammonia overall control is sprayed generally using SCR exit NOx concentration measured value as feedback signal, adjusts spray ammonia overall control valve
(general every side 1).But the current outlet SCR generallys use spot measurement NOx concentration；The representativeness of spot measurement value is poor, no
It can reflect the case where SCR exports NOx mean concentration, therefore whether cannot characterize spray ammonia total amount completely suitable.In addition, current SCR goes out
Mouthful NOx concentration generallys use CEMS measurement, there is also lag times it is long, maintenance workload is big the problems such as.
Spray ammonia uniformity generally need to spray ammonia by manually adjusting several spray ammonia manual modulation valves (general every side 8~40)
Manual modulation valve is located at the downstream of spray ammonia overall control valve, and the main foundation of adjustment is field measurement SCR exit NOx concentration point
Cloth.The spray ammonia manual modulation valve increase in the local higher region of NOx concentration, corresponding upstream AIG (spray ammonia adjusts device) is opened
Degree, it is on the contrary then reduce aperture, it is relatively uniform by repeated multiple times adjustment guarantee SCR exit NOx concentration distribution.If SCR is urged at this time
Agent module then illustrates that spraying ammonia uniformity is guaranteed there is no failures such as apparent abrasion, collapsing and stifled ashes.
Above-mentioned spray ammonia total amount has realized automatic control, but spray ammonia uniformity is also relied primarily on and periodically manually adjusted, adjustment
Purpose is to realize that different zones ammonia nitrogen molar ratio in SCR inlet section reaches unanimity, so that the outlet SCR different zones
NOx concentration deviation is little.Since primary complete AIG adjustment process takes a long time, it is larger to expend, coal fired power plant is generally every
Year adjustment is primary, and the mostly outer completion of committee.
Since AIG characteristic is basically unchanged in an adjustment period, when burning coal type change, mill combination change, burning
When the factors such as device adjustment cause the distribution of SCR inlet NOx concentration and flow field that significant change occurs, the uniformity of ammonia nitrogen molar ratio will be bright
Aobvious to be deteriorated, i.e., the deviation of local ammonia nitrogen molar ratio and average value becomes larger；The too small region of ammonia nitrogen molar ratio, local denitration efficiency is not
Can be up to standard, and the region that ammonia nitrogen molar ratio is excessive, the escaping of ammonia rate are exceeded.
Before minimum discharge transformation, coal fired power plant executes special discharge standard, and denitration efficiency is generally in 60%~80%
Between, i.e., ammonia nitrogen molar ratio average value generally controls between 0.6~0.8；And after minimum discharge transformation, NOx emission concentration is wanted
It asks and is strict controlled in 50mg/Nm3Hereinafter, unit SCR denitration efficiency often beyond 90%, i.e. ammonia nitrogen molar ratio average value is more than
0.9.When the factors such as burning coal type change, mill combination change, burner adjustment lead to the distribution of SCR inlet NOx concentration and stream
When significant change occurs for field, execution minimum discharge standard, which will lead to the position that ammonia nitrogen molar ratio is more than 1, to be greatly increased, the escaping of ammonia
Rate will far super permissible value (< 3ppm), thus easily cause air preheater block up ash, electric precipitation polar curve dust stratification etc. adverse effect.
Summary of the invention
In order to solve a series of above-mentioned problems, the present invention provide a kind of SCR denitration device, its spray ammonia regulating device and its spray
Ammonia method of adjustment.
In order to solve the above technical problems, the technical scheme is that
A kind of SCR denitration device spray ammonia regulating device, including spray ammonia main pipe；Spray ammonia main pipe branches into two or more sprays
Ammonia subregion main pipe, every spray ammonia subregion main pipe branch into two or more spray ammonia branch pipes；It is respectively equipped on every spray ammonia branch pipe
Ammonia manual modulation valve is sprayed, spray ammonia district grid valve, the spray ammonia main pipe before non-branch are respectively equipped in every spray ammonia subregion main pipe
Upstream section is equipped with the spray total adjustable valve of ammonia.
Spray ammonia main pipe Upstream section before above-mentioned non-branch refers to that the starting point of spray ammonia main pipe, namely spray ammonia main pipe do not branch into spray
Part before ammonia subregion main pipe；Spray ammonia district grid valve, i.e. spray ammonia district grid are respectively equipped in every spray ammonia subregion main pipe
Valve and spray ammonia subregion main pipe correspond, and adjust the ammonia amount for entering spray ammonia subregion main pipe by spray ammonia main pipe.
As the further preferred of the application, spray ammonia main pipe and branch into 3~5 spray ammonia subregion main pipes.
Each spray ammonia subregion main pipe is parallel with one another namely each total adjustable valve downstream of spray ammonia sets 3~5 spray ammonia district grids
Valve, it is each to spray the parallel connection of ammonia district grid valve；Every spray ammonia subregion main pipe branches into one group of spray ammonia branch pipe.
Applicant further study show that, due to SCR denitration device flue cross section be horizontal width be greater than vertical height
It is rectangular-shaped, and width is generally 3~5 times of height, considers that ammonia enters in flue gas the rule for mixing and spreading, is divided into 3~5
Relatively independent region finely controls ammonia spraying amount, can greatly improve spray ammonia uniformity.If number of partitions further increases, not only throw
Money cost can increase therewith, and system reliability can decline therewith, and therefore, applicant is preferably several spray ammonia in the prior art
Manual modulation valve and spray ammonia branch pipe are divided into 3~5 groups.
A kind of SCR denitration device, including denitrification apparatus ontology, denitrification apparatus ontology include SCR flue entrance and SCR flue
Outlet, also comprising above-mentioned SCR denitration device spray ammonia regulating device and SCR exit NOx concentration monitoring device；
SCR denitration device is arranged outside SCR flue entrance with spray ammonia regulating device, and ammonia is sprayed into SCR denitration device；
SCR exit NOx concentration monitoring device includes multiple spot mixed sampling device and NOx in-line analyzer, and multiple spot mixing takes
Sampling device includes multidraw section, transition connection section and the smoke mixing section being sequentially communicated；Multidraw section is located at SCR flue and goes out
Mouthful, smoke mixing section is connected to air preheater flue outlet；NOx in-line analyzer is arranged in smoke mixing section.
Denitrification apparatus ontology and air preheater are existing equipment commonly used in the art, unnecessary to avoid, and are not described excessively.
General every Thermal generation unit has two SCR denitration devices, is traditionally known as the side A and the side B in the industry.
The application spray ammonia district grid valve can remote manual or automatic adjustment, preferably automated adjusting, adjusting foundation be it is upper
Each subregion NOx mean concentration stating the areal sampling of multiple spot mixed sampling device, successively being measured through NOx in-line analyzer.
In order to further ensure the accuracy and convenience of NOx measurement, the multidraw section of multiple spot mixed sampling device is by 6
~12 multidraw rifle compositions；Transition connection section includes and the same amount of sampling branch pipe of multidraw rifle, multidraw rifle
It corresponds with sampling branch pipe, the corresponding sampling branch pipe connection of every multidraw rifle, is equipped on every sampling branch pipe
Sample control valve；Smoke mixing section includes sampling main pipe, and all sampling branch pipes converge to sampling main pipe, and sampling main pipe is equipped with
NOx in-line analyzer；Multidraw rifle arranges that sampling main pipe and air preheater flue outlet connect along SCR flue outlet width direction
It is logical.
It is preferred that above-mentioned multidraw rifle the arrangement quantity of width direction and position according to the number of upstream ammonia-spraying grid and
Depending on space layout, further preferably, the area equation of the corresponding ammonia-spraying grid covering of every multidraw rifle；Spray ammonia lattice
Grid are equal with spray ammonia manual modulation valve quantity, correspond.
Above-mentioned ammonia-spraying grid is existing usual means in SCR denitration device.
In order to further ensure that the uniformity of spray ammonia, spray ammonia branch pipe is divided into 3~5 groups；Sampling branch pipe is divided into 3~5 groups, sprays ammonia
The group number of branch pipe is consistent with the sampling group number of branch pipe and corresponds to each other.
Above-mentioned spray ammonia branch pipe is divided into 3~5 groups, namely spray ammonia main pipe branches into 3~5 spray ammonia subregion main pipes, every spray ammonia
Subregion main pipe corresponds to one group of spray ammonia branch pipe.
When the sampling control valve opened on wherein one group of sampling branch pipe closes other group, then respective partition is extracted automatically
Flue gas aggregate sample, to learn NOx removal effect in the subregion.
Above-mentioned sampling control valve successively opens and closes by group, can measure SCR and export each subregion NOx mean concentration, from
And foundation is provided for the control and adjusting of above-mentioned spray ammonia district grid valve.
Above-mentioned sampling control valve successively opens and closes one by one, can measure different positions in SCR flue outlet width direction
NOx concentration distribution situation is set, so that the scene for above-mentioned spray ammonia manual modulation valve manually adjusts and provides foundation.
It is successively opened and closed by sampling control valve, realizes and patrol survey to what SCR exit NOx concentration was distributed, protrude excellent
Gesture is embodied in: only being measured each point or each subregion NOx concentration with a set of NOx in-line analyzer, is not only reduced investment and maintenance workers
It measures, and NOx in-line analyzer itself meter error influences very the evaluation of SCR flue outlet NOx concentration distributing homogeneity
It is small, be conducive to improve total system reliability and degree of regulation.
Above-mentioned sampling control valve successively opens and closes by group, is conducive to shorten and patrols the time for surveying one time, patrols to reduce
The possibility for the influence that operating condition variation is distributed flue gas flow field and NOx concentration during survey, and then be conducive to improve spray ammonia district grid
The control of valve and degree of regulation.
Above-mentioned sampling control valve successively opens and closes one by one, patrols and surveys one time time and accordingly extend, but surveys under the mode
Amount data are not used to system automatic adjustment, but scene is instructed to manually adjust spray ammonia manual modulation valve, participant during adjustment
Member can manual intervention, also facilitate the stability for judging operating condition, therefore, the SCR exit NOx concentration that survey is patrolled under the mode is distributed in detail
The validity of data is still guaranteed.
Above-mentioned a set of multiple spot mixed sampling device, the different working modes by sampling control valve switch, and realization takes respectively
It is engaged in spray ammonia partitioning control valve and spray ammonia hand control valve, if further excavating its extension function, can also serve spray ammonia total amount
Control valve is " killing three birds with one stone ", specific implementation are as follows: is taken on the sampling branch pipe of multiple spot mixed sampling device and each sampling
The upstream of control valve connects a sampling bypass branch respectively, and each bypass branch is collected to sampling bypass main pipe, female in sampling bypass
NOx concentration is surveyed on pipe.
It is investment reduction for retrofitted unit, it is preferable that NOx in the above-mentioned sampling bypass main pipe of the former CEMS systematic survey that reuses
Concentration.
In order to improve the degree of automation of system, it is preferable that SCR exit NOx concentration monitoring device further includes acquisition and control
Module, acquisition at least receive NOx in-line analyzer with control module and sample the transmission signal of control valve.Acquisition and control module
It realizes referring to existing well-known technique in row.
The direction in downstream namely the direction of flow of flue gas are swum over in the application.
In order to prepare convenience, save the cost, while guaranteeing the convenience and accuracy of sampling, it is preferable that multiple spot mixed sampling
Device uses internal diameter to make for the tubing of 20~100mm, i.e., cross section (flow area) is circle.
The representativeness and real-time of smoke sampling in order to balance, and prevent the stifled ash of sampling hole, it is preferable that multidraw section takes
Sample hole is circular hole, and the internal diameter of sampling hole is 6~18mm, and sampling hole is evenly arranged along the length direction of multidraw section, Ye Jiqu
Multidraw section is divided into the n+1 section of equal length by sample hole, and n is sampling hole number.
Further preferably, sampling hole at least three and back air-flow setting, the circulation area summation of all sampling holes is not more than
The 40% of multidraw section actual internal area.
Air-flow is met in multidraw section wall surface side, and another side back air-flow, sampling hole setting, can be as far as possible in back air-flow side
Down-sample the dust content of flue gas.
In order to further decrease the possibility that above-mentioned multidraw device blocks up ash, SCR exit NOx concentration monitoring device is also wrapped
Include hot wind blowback subsystem, the preferred heat primary air of gas source of hot wind blowback subsystem.Above-mentioned hot wind blowback subsystem includes at least
Blowback pipeline, blowback control valve and blowback isolating valve, blowback isolating valve are located in smoke mixing section, and blowback control valve is located at blowback
On pipeline, and blowback piping connection smoke mixing section, be located at blowback isolating valve upstream.When come into operation hot wind blowback subsystem when, instead
Blow isolating valve closing, blowback control valve is opened；And when measuring system bringing normally into operation, blowback isolating valve is opened, blowback control valve closes
It closes.
It is distributed to convert NOx concentration under benchmark oxygen amount, SCR exit NOx concentration monitoring device, further includes O2On-line analysis
Instrument, O2In-line analyzer is also provided in smoke mixing section.It is preferred that O2In-line analyzer and the integrated use of NOx in-line analyzer.
In order to improve the reliability of above-mentioned SCR exit NOx concentration monitoring device, it is preferable that NOx in-line analyzer is straight cutting
Formula, using semiconductive ceramic gas sensor, can long-term work under 500 DEG C of flue gas environment below.
The spray ammonia method of adjustment of above-mentioned SCR denitration device, it is dense according to NOx obtained in SCR exit NOx concentration monitoring device
Degree, it is total using the total adjustable valve of spray ammonia, spray ammonia district grid valve and spray ammonia manual modulation valve three-level regulating valve series control spray ammonia
Amount and uniformity.
Using periodical self-regulation mode, guarantee being averaged for all spray ammonia district grid valves during each period modulation
Aperture is basically unchanged.That is part spray ammonia district grid valve while reducing aperture, spray ammonia district grid valve and increase with it by part
Aperture, and reduction amplitude and increase amplitude are roughly the same.
Applicant it has been investigated that, the prior art adjusts spray using " spray ammonia overall control valve+spray ammonia manual modulation valve "
Ammonia total amount and spray ammonia uniformity do not adapt to the strict demand of minimum discharge, therefore innovative proposition " spray ammonia overall control valve
The technical solution of+spray ammonia district grid valve+spray ammonia manual modulation valve ".
For the uniformity for guaranteeing spray ammonia, the reliability and timeliness of adjustment are combined, it is preferred to spray the ammonia side of optimizing and revising
Method are as follows: include the following steps:
A, SCR flue outlet approximation is divided into 3~5 subregions, it is each to patrol survey using SCR exit NOx concentration monitoring device
Subregion NOx mean concentration, i.e. sampling control valve successively open and close by group；
B, ammonia district grid valve is sprayed according to the on-line automatic adjustment of the resulting NOx mean concentration measured value of step A, it is each to guarantee
Subregion NOx mean concentration is approximately equal, wherein and spray ammonia district grid valve sets aperture regulation section, i.e. the restriction upper limit and lower limit,
When needing out-of-limit adjusting that could level each subregion NOx mean concentration, just prompt need to carry out the artificial tune of spray ammonia manual modulation valve
It is whole, before manually adjusting spray ammonia manual modulation valve, spray ammonia district grid valve is manually set in the centre in aperture regulation section first
The intermediate valve position of position, the i.e. upper limit and lower limit is then switched to the mode that sampling control valve successively opens and closes one by one, obtains
Take more detailed SCR exit NOx concentration distributed data, refinement adjustment spray ammonia manual modulation valve, to guarantee that SCR flue outlet is wide
It is uniform as far as possible to spend the distribution of direction NOx concentration, switches spray ammonia district grid valve after adjustment again to auto state.
Above-mentioned spray ammonia optimizes and revises the technical idea of method embodiment are as follows: ammonia district grid valve is sprayed in automatic coarse adjustment, to adapt to SCR
The variation in inlet flue gas flow field and NOx concentration distribution so as to improve the uniformity of SCR inlet ammonia nitrogen molar ratio, namely is based on SCR
Catalyst maximum denitration ability improves the uniformity of SCR exit NOx concentration distribution；In certain valve opening interval range,
Ammonia district grid valve is sprayed in automatic coarse adjustment, it cannot be guaranteed that the distribution of SCR exit NOx concentration is relatively uniform, that is, illustrates SCR inlet flue gas
The variation of flow field and NOx concentration distribution is very big, it is necessary to which ammonia manual modulation valve is sprayed in manual fine tuning, to realize adjustment spray on demand
Ammonia uniformity.
The unmentioned technology of the present invention is referring to the prior art.
The spray ammonia method of adjustment of SCR denitration device of the present invention, by exporting NOx mean concentration and NOx concentration distribution to SCR
It being monitored, General Promotion sprays the quality of ammonia control, including improving spray ammonia uniformity and promoting the accuracy of spray ammonia overall control,
The emphasis of whole system design aspect is highly integrated, has the significant advantages such as with low investment, reliability is high.
Detailed description of the invention
Fig. 1 is the design scheme schematic diagram that the prior art sprays ammonia regulating device.
Fig. 2 is the design scheme schematic diagram that ammonia regulating device is sprayed in the present invention.
Fig. 3 is SCR exit NOx concentration monitoring device installation diagram in the present invention.
Fig. 4 is the design scheme schematic diagram of SCR exit NOx concentration monitoring device in the embodiment of the present invention 1.
Fig. 5 is the design scheme schematic diagram of SCR exit NOx concentration monitoring device in the embodiment of the present invention 2.
Fig. 6 is the design scheme schematic diagram of SCR exit NOx concentration monitoring device in the embodiment of the present invention 3.
In figure, 1 is SCR flue outlet, and 2 be air preheater flue outlet, and 3 be spray ammonia overall control valve, and 4 be to spray ammonia main pipe, 5
To spray ammonia manual modulation valve, 6 be spray ammonia branch pipe, and 7 be spray ammonia district grid valve, and 8 be spray ammonia subregion main pipe, and 9 take for multiple spot mixing
Sampling device, 10 be NOx and/or O2In-line analyzer, 11 be multidraw section, and 12 be transition connection section, and 13 be smoke mixing section,
14 be multidraw rifle, and 15 is sample control valve, and 16 be sampling bypass branch, and 17 bypass main pipe for sampling, and 18 be original CEMS system
System, 19 be blowback pipeline, and 20 be blowback control valve, and 21 be blowback isolating valve, and 30 be air preheater.
Specific embodiment
For a better understanding of the present invention, below with reference to the embodiment content that the present invention is furture elucidated, but it is of the invention
Content is not limited solely to the following examples.
Embodiment 1
SCR denitration device as shown in Figure 2 spray ammonia regulating device, including spray ammonia main pipe；Spray ammonia main pipe branches into three
Ammonia subregion main pipe is sprayed, every spray ammonia subregion main pipe branches into three spray ammonia branch pipes；Spray ammonia is respectively equipped on every spray ammonia branch pipe
Manual modulation valve is respectively equipped with spray ammonia district grid valve in every spray ammonia subregion main pipe, sets in the spray ammonia main pipe before non-branch
There is the spray total adjustable valve of ammonia.
SCR denitration device as shown in Figure 3, including denitrification apparatus ontology, denitrification apparatus ontology include SCR flue entrance and
SCR flue outlet, also comprising above-mentioned SCR denitration device spray ammonia regulating device and SCR exit NOx concentration monitoring device；
SCR denitration device is arranged outside SCR flue entrance with spray ammonia regulating device, and ammonia is sprayed into SCR denitration device；
SCR exit NOx concentration monitoring device includes multiple spot mixed sampling device and NOx in-line analyzer, and multiple spot mixing takes
Sampling device includes multidraw section, transition connection section and the smoke mixing section being sequentially communicated；Multidraw section is located at SCR flue and goes out
Mouthful, smoke mixing section is connected to air preheater flue outlet；NOx in-line analyzer is arranged in smoke mixing section.
The multidraw section of above-mentioned multiple spot mixed sampling device is made of 9 multidraw rifles；Transition connection section include with
The same amount of sampling branch pipe of multidraw rifle, multidraw rifle and sampling branch pipe correspond, every multidraw rifle and its
Corresponding sampling branch pipe is connected to, and is equipped with sampling control valve on every sampling branch pipe；Smoke mixing section includes sampling main pipe, is owned
Sampling branch pipe converge to sampling main pipe, sampling main pipe is equipped with NOx in-line analyzer；Multidraw rifle is along SCR flue outlet
Width direction setting, sampling main pipe are connected to air preheater flue outlet.
Arrangement quantity and position number and space according to upstream ammonia-spraying grid of the above-mentioned multidraw rifle in width direction
Depending on arrangement, the area equation of the corresponding ammonia-spraying grid covering of every multidraw rifle；Ammonia-spraying grid is adjusted manually with spray ammonia
Section valve quantity is equal, corresponds.
Above-mentioned ammonia-spraying grid is existing usual means in SCR denitration device.
Above-mentioned spray ammonia branch pipe has 3 groups；Sampling branch pipe has 3 groups, spray ammonia branch pipe group number it is consistent with the group number of branch pipe is sampled and
It corresponds to each other.
When the sampling control valve opened on wherein one group of sampling branch pipe closes other group, then respective partition is extracted automatically
Flue gas aggregate sample, to learn NOx removal effect in the subregion.
Above-mentioned sampling control valve successively opens and closes by group, can measure SCR and export each subregion NOx mean concentration, from
And foundation is provided for the control and adjusting of above-mentioned spray ammonia district grid valve.
Above-mentioned sampling control valve successively opens and closes one by one, can measure different positions in SCR flue outlet width direction
NOx concentration distribution situation is set, so that the scene for above-mentioned spray ammonia manual modulation valve manually adjusts and provides foundation.
Multiple spot mixed sampling device uses internal diameter to make for the tubing of 80mm, and the tube wall of multidraw rifle is equipped with sampling
Hole；Sampling hole is circular hole, and the internal diameter of sampling hole is 12mm, sampling hole at least three and back air-flow is along the length side of multidraw rifle
To being evenly arranged, the circulation area summation of all sampling holes is not more than the 40% of multidraw rifle cross-sectional area；
It is above-mentioned that take multiple spot mixed sampling device further include O2In-line analyzer, O2In-line analyzer and NOx in-line analyzer collection
At using, it is located in smoke mixing section.
Above-mentioned NOx in-line analyzer be it is direct insertion, using semiconductive ceramic gas sensor, can long-term work at 500 DEG C
Under flue gas environment below.
The spray ammonia method of adjustment of above-mentioned SCR denitration device, it is dense according to NOx obtained in SCR exit NOx concentration monitoring device
Degree, it is total using the total adjustable valve of spray ammonia, spray ammonia district grid valve and spray ammonia manual modulation valve three-level regulating valve series control spray ammonia
Amount and uniformity, specifically comprise the following steps:
A, SCR flue outlet approximation is divided into 3 subregions, is patrolled using SCR exit NOx concentration monitoring device and surveys each subregion
NOx mean concentration, i.e. sampling control valve successively open and close by group；
B, ammonia district grid valve is sprayed according to the on-line automatic adjustment of the resulting NOx mean concentration measured value of step A, it is each to guarantee
Subregion NOx mean concentration is approximately equal, wherein spray ammonia district grid valve sets aperture regulation section as 60%~80%, that is, limits
Determine the upper limit be 80%, lower limit 60%, when needing out-of-limit adjusting that could level each subregion NOx mean concentration, just prompting need to be into
Row spray ammonia manual modulation valve manually adjusts, first that spray ammonia district grid valve is manual before manually adjusting spray ammonia manual modulation valve
It is set in the middle position in aperture regulation section, i.e., 70%, is then switched to what sampling control valve successively opened and closed one by one
Mode obtains more detailed SCR exit NOx concentration distributed data, refinement adjustment spray ammonia manual modulation valve, to guarantee SCR cigarette
Exit width direction NOx concentration distribution in road is uniform as far as possible, switches spray ammonia district grid valve after adjustment again to auto state.
Embodiment 2
It is substantially the same manner as Example 1, except that: taking multiple spot mixed sampling device further includes hot wind blowback subsystem,
The gas source of hot wind blowback subsystem is heat primary air；Hot wind blowback subsystem includes at least blowback pipeline, blowback control valve and anti-
Isolating valve is blown, blowback isolating valve is located in smoke mixing section, and blowback control valve is located at anti-blowpipe road, blowback piping connection flue gas
Mixing section and be located at blowback isolating valve upstream.
Embodiment 3
It is substantially the same manner as Example 1, except that: it takes on the sampling branch pipe of multiple spot mixed sampling device and each sampling
The upstream of control valve connects a sampling bypass branch respectively, and each bypass branch is collected to sampling bypass main pipe, female in sampling bypass
NOx concentration is surveyed on pipe, NOx concentration in the above-mentioned sampling bypass main pipe of the former CEMS systematic survey that reuses, as spray ammonia overall control
The principal parameter of valve control, to further increase the quality of spray ammonia overall control.
Embodiment 4
It is substantially the same manner as Example 1, except that: spray ammonia main pipe branches into 5 spray ammonia subregion main pipes, every spray ammonia point
Area's main pipe branches into 6 spray ammonia branch pipes.
Claims (7)
1. a kind of spray ammonia method of adjustment of SCR denitration device, it is characterised in that: SCR denitration device spray ammonia regulating device, including
Spray ammonia main pipe；Spray ammonia main pipe branches into 3~5 spray ammonia subregion main pipes, and every spray ammonia subregion main pipe branches into two or more sprays
Ammonia branch pipe；It is respectively equipped with spray ammonia manual modulation valve on every spray ammonia branch pipe, is respectively equipped with spray in every spray ammonia subregion main pipe
Ammonia district grid valve, the spray ammonia main pipe Upstream section before non-branch are equipped with the spray total adjustable valve of ammonia；
SCR denitration device, including denitrification apparatus ontology, denitrification apparatus ontology include SCR flue entrance and SCR flue outlet, are gone back
Packet SCR denitration device spray ammonia regulating device and SCR exit NOx concentration monitoring device；
SCR denitration device is arranged outside SCR flue entrance with spray ammonia regulating device, and ammonia is sprayed into SCR denitration device；
SCR exit NOx concentration monitoring device includes multiple spot mixed sampling device and NOx in-line analyzer, multiple spot mixed sampling dress
Set multidraw section, transition connection section and smoke mixing section including being sequentially communicated；Multidraw section is located at SCR flue outlet,
Smoke mixing section is connected to air preheater flue outlet；NOx in-line analyzer is arranged in smoke mixing section；
Spray ammonia method of adjustment is the NOx concentration according to obtained in SCR exit NOx concentration monitoring device, is adjusted using spray ammonia total amount
Valve, spray ammonia district grid valve and spray ammonia manual modulation valve three-level regulating valve series control spray ammonia total amount and uniformity, including it is as follows
Step:
A, SCR flue outlet is divided into 3~5 subregions, it is flat to patrol each subregion NOx of survey using SCR exit NOx concentration monitoring device
Equal concentration, i.e. sampling control valve successively open and close by group；
B, ammonia district grid valve is sprayed according to the on-line automatic adjustment of the resulting NOx mean concentration measured value of step A, to guarantee each subregion
NOx mean concentration is equal, wherein spray ammonia district grid valve sets aperture regulation section, i.e. the restriction upper limit and lower limit, when needs are got over
Limit is adjusted when could level each subregion NOx mean concentration, and just prompt need to carry out manually adjusting for spray ammonia manual modulation valve, artificial to adjust
Before whole spray ammonia manual modulation valve, spray ammonia district grid valve is manually set in the middle position in aperture regulation section first, i.e., on
The intermediate valve position of limit and lower limit is then switched to the mode that sampling control valve successively opens and closes one by one, obtains more detailed
Thin SCR exit NOx concentration distributed data, refinement adjustment spray ammonia manual modulation valve, to guarantee SCR flue outlet width direction
NOx concentration distribution is uniform as far as possible, switches spray ammonia district grid valve after adjustment again to auto state.
2. the spray ammonia method of adjustment of SCR denitration device as described in claim 1, it is characterised in that: multiple spot mixed sampling device
Multidraw section be made of 6~12 multidraw rifles；Transition connection section includes and the same amount of sampling of multidraw rifle
Branch pipe, multidraw rifle and sampling branch pipe correspond, and the corresponding sampling branch pipe connection of every multidraw rifle, every takes
Sampling control valve is equipped on sample branch pipe；Smoke mixing section includes sampling main pipe, and all sampling branch pipes converge to sampling main pipe,
NOx in-line analyzer is located in sampling main pipe；Multidraw rifle is arranged along SCR flue outlet width direction, sampling main pipe and sky
Pre- device flue outlet connection.
3. the spray ammonia method of adjustment of SCR denitration device as claimed in claim 2, it is characterised in that: every multidraw rifle with
The area equation of its corresponding ammonia-spraying grid covering；Ammonia-spraying grid is equal with spray ammonia manual modulation valve quantity, corresponds.
4. the spray ammonia method of adjustment of SCR denitration device as claimed in claim 2 or claim 3, it is characterised in that: spray ammonia branch pipe is divided into 3
~5 groups；Sampling branch pipe is divided into 3~5 groups, and the group number of spray ammonia branch pipe is consistent with the sampling group number quantity of branch pipe and corresponds to each other.
5. the spray ammonia method of adjustment of SCR denitration device as claimed in claim 2 or claim 3, it is characterised in that: take multiple spot mixed sampling
On the sampling branch pipe of the device and upstream of each sampling control valve, connects a sampling bypass branch, each bypass branch is collected to respectively
Sampling bypass main pipe surveys NOx concentration in sampling bypass main pipe.
6. the spray ammonia method of adjustment of SCR denitration device as claimed in claim 2 or claim 3, it is characterised in that: multiple spot mixed sampling dress
It sets and internal diameter is used to make for the tubing of 20~100mm, the tube wall of multidraw rifle is equipped with sampling hole；Sampling hole is circular hole, is taken
The internal diameter in sample hole be 6~18mm, sampling hole at least three and back air-flow be evenly arranged along the length direction of multidraw rifle, own
The circulation area summation of sampling hole is not more than the 40% of multidraw rifle cross-sectional area.
7. the spray ammonia method of adjustment of SCR denitration device as claimed in any one of claims 1-3, it is characterised in that: the outlet SCR
NOx concentration monitoring device further includes hot wind blowback subsystem, and the gas source of hot wind blowback subsystem is heat primary air；Hot wind blowback
System includes at least blowback pipeline, blowback control valve and blowback isolating valve, and blowback isolating valve is located in smoke mixing section, blowback control
Valve processed be located at anti-blowpipe road, blowback piping connection smoke mixing section and be located at blowback isolating valve upstream.
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