CN106345298A - SCR denitration device as well as ammonia spraying adjustment device and ammonia spraying adjustment method thereof - Google Patents
SCR denitration device as well as ammonia spraying adjustment device and ammonia spraying adjustment method thereof Download PDFInfo
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- CN106345298A CN106345298A CN201610899397.1A CN201610899397A CN106345298A CN 106345298 A CN106345298 A CN 106345298A CN 201610899397 A CN201610899397 A CN 201610899397A CN 106345298 A CN106345298 A CN 106345298A
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 422
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 211
- 238000005507 spraying Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000033228 biological regulation Effects 0.000 claims abstract description 17
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 13
- 239000007921 spray Substances 0.000 claims description 179
- 238000005070 sampling Methods 0.000 claims description 92
- 238000012806 monitoring device Methods 0.000 claims description 21
- 239000000779 smoke Substances 0.000 claims description 21
- 230000007704 transition Effects 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 2
- 238000013461 design Methods 0.000 abstract description 7
- 230000010354 integration Effects 0.000 abstract 1
- 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 9
- 239000003245 coal Substances 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- 238000005192 partition Methods 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
- 150000001875 compounds Chemical class 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 230000009467 reduction Effects 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
- 241001314440 Triphora trianthophoros Species 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
- 230000000903 blocking effect Effects 0.000 description 1
- 235000019994 cava Nutrition 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000000977 initiatory effect Effects 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
- 238000012423 maintenance Methods 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
- 238000004904 shortening Methods 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 210000001138 tear Anatomy 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
- B01D53/90—Injecting reactants
-
- 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
Abstract
The invention discloses an SCR denitration device as well as an ammonia spraying adjustment device and ammonia spraying adjustment method thereof. The ammonia spraying adjustment device for the SCR denitration device comprises an ammonia spraying mother pipe; the ammonia spraying mother pipe is divided into more than two ammonia spraying sub-mother pipes; each ammonia spraying sub-mother pipe is divided into more than two ammonia spraying branch pipes; each ammonia spraying branch pipe is provided with an ammonia spraying manual regulation valve; an ammonia spraying sub-regulation valve is arranged on each ammonia spraying sub-mother pipe; and an ammonia spraying total regulation valve is arranged on the upstream section of the ammonia spraying mother pipe before division. In the invention, the NOx average concentration and NOx concentration distribution at the SCR exit are monitored, and thus the quality of ammonia spraying control is comprehensively improved; and the design of the whole system lays emphasis on high integration and has remarkable advantages of investment saving, high reliability and the like.
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 denitrification apparatus, its spray ammonia
Adjusting means and its spray ammonia method of adjustment.
Background technology
At present, the commonly used scr denitrification apparatus of large-scale coal fired power plant are reducing nox concentration of emission in flue gas.Scr utilizes
nh3Nox is reduced to the n of environmental sound in the presence of catalyst by the reduction characteristic to nox2And h2o.In actual motion mistake
Cheng Zhong, the control of ammonia spraying amount is particularly critical, increases ammonia spraying amount and advantageously reduces nox concentration of emission, but the escaping of ammonia rate can increase therewith
Plus, and then easily cause downstream air preheater and block and corrode it is also possible to causing electric precipitation polar curve dust stratification, removing because ammonium hydrogen sulfate deposits
Dirt cloth bag sticks the adverse effects such as ash.
In spray ammonia control aspect, on the one hand require rationally to control spray ammonia total amount, on the other hand require to ensure spray ammonia uniformity
(referring mainly to ammonia nitrogen mol ratio relatively uniform), to guarantee allowing in the range of the escaping of ammonia rate, nox concentration of emission is up to standard.
Spray ammonia overall control typically using scr outlet nox concentration measurement as feedback signal, adjusts spray ammonia overall control valve
(typically every side 1).But current scr exports commonly used spot measurement nox concentration；The representativeness of spot measurement value is poor, no
Can reflect that scr exports the situation of nox mean concentration, therefore whether can not characterize spray ammonia total amount completely suitable.Additionally, current scr goes out
Mouth nox concentration commonly used cems measurement, also haves such problems as that lag time length, maintenance workload are big.
Spray ammonia uniformity typically need to spray ammonia by manually adjusting some sprays ammonia manual modulation valves (typically every side 8～40)
Manual modulation valve is located at the downstream of spray ammonia overall control valve, and the Main Basiss of its adjustment are that field measurement scr outlet nox concentration is divided
Cloth.The higher region of local nox concentration, the spray ammonia manual modulation valve of corresponding upstream aig (spray ammonia adjusting apparatus) increases to be opened
Degree, on the contrary then reduce aperture, ensure that scr exports nox concentration distribution by repeated multiple times adjustment relatively uniform.If now scr urges
Agent module does not exist significantly weares and teares, caves in and blocks up the faults such as ash, then explanation spray ammonia uniformity is ensured.
Above-mentioned spray ammonia total amount is realized automatically controlling, but spray ammonia uniformity also relies primarily on and periodically manually adjusts, adjustment
Purpose is to realize scr entrance section zones of different ammonia nitrogen mol ratio to reach unanimity, so that scr outlet zones of different
Nox concentration deviation is little.Due to once complete aig adjustment process take longer, expend larger, therefore coal fired power plant is typically every
Year adjusts once, and outer completing of mostly entrusting.
Because in the adjustment cycle, aig characteristic is basically unchanged, when burning coal type change, mill compound mode change, burn
When the factors such as device adjustment lead to scr entrance nox concentration distribution and flow field that significant change occurs, the uniformity of ammonia nitrogen mol ratio will be bright
Aobvious variation, that is, local ammonia nitrogen mol ratio and the deviation of meansigma methodss become big；The too small region of ammonia nitrogen mol ratio, local denitration efficiency is not
Can be up to standard, and the excessive region of ammonia nitrogen mol ratio, the escaping of ammonia rate is exceeded.
Before minimum discharge transformation, coal fired power plant executes special discharge standard, and denitration efficiency is generally in 60%～80%
Between, that is, ammonia nitrogen mol ratio meansigma methodss generally control between 0.6～0.8；And after minimum discharge transformation, nox concentration of emission will
Ask and be strict controlled in 50mg/nm3Hereinafter, unit scr denitration efficiency exceedes often beyond 90%, i.e. ammonia nitrogen mol ratio meansigma methodss
0.9.When the factors such as burning coal type change, mill compound mode change, burner adjustment lead to scr entrance nox concentration distribution and stream
When field occurs significant change, execution minimum discharge standard will lead to the position that ammonia nitrogen mol ratio is more than 1 will greatly increase, the escaping of ammonia
Rate will far super permissible value (＜ 3ppm), thus easily causing air preheater to block up the adverse effect such as ash, electric precipitation polar curve dust stratification.
Content of the invention
In order to solve an a series of above-mentioned difficult problem, the present invention provides a kind of scr denitrification apparatus, its spray ammonia adjusting means and its spray
Ammonia method of adjustment.
For solving above-mentioned technical problem, the technical scheme is that
A kind of scr denitrification apparatus spray ammonia adjusting means, including spray ammonia main pipe；Spray ammonia main pipe branches into the spray of more than two
Ammonia subregion main pipe, every sprays the spray ammonia arm that ammonia subregion main pipe branches into more than two；Respectively it is provided with every spray ammonia arm
Spray ammonia manual modulation valve, every spray ammonia subregion main pipe is respectively provided with spray ammonia district grid valve, the spray ammonia main pipe before non-branch
Upstream section is provided with the spray total adjustable valve of ammonia.
Spray ammonia main pipe Upstream section before above-mentioned non-branch refers to spray the initiating terminal of ammonia main pipe, namely spray ammonia main pipe does not branch into spray
Part before ammonia subregion main pipe；Respectively it is provided with spray ammonia district grid valve in every spray ammonia subregion main pipe, that is, spray ammonia district grid
Valve is corresponded with spray ammonia subregion main pipe, adjusts the ammonia amount being entered spray ammonia subregion main pipe by spray ammonia main pipe.
Further preferred as the application, spray ammonia main pipe branches into 3～5 spray ammonia subregion main pipes.
Each spray ammonia subregion main pipe is parallel with one another, namely each spray ammonia total adjustable valve downstream sets 3～5 spray ammonia district grid
Valve, each spray ammonia district grid valve is in parallel；Every spray ammonia subregion main pipe branches into one group of spray ammonia arm.
Applicant further study show that, the flue cross section due to scr denitrification apparatus is more than vertical height for horizontal width
Rectangular-shaped, and width is generally 3～5 times of height it is considered to ammonia enters the rule of mixing and diffusion in flue gas, is divided into 3～5
Relatively independent region precise controlling ammonia spraying amount, can greatly improve spray ammonia uniformity.If number of partitions increases further, not only throw
Money cost can increase therewith, and system reliability can decline therewith, and therefore, applicant is preferably spray ammonia some in prior art
Manual modulation valve and spray ammonia arm are divided into 3～5 groups.
A kind of scr denitrification apparatus, including denitrification apparatus body, denitrification apparatus body includes scr flue entrance and scr flue
Outlet, also comprises above-mentioned scr denitrification apparatus spray ammonia adjusting means and scr outlet nox concentration monitoring device；
Scr denitrification apparatus spray ammonia adjusting means is arranged on outside scr flue entrance, and sprays ammonia into scr denitrification apparatus；
Scr outlet 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 linkage 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 with air preheater flue outlet；Nox in-line analyzer is arranged in smoke mixing section.
Denitrification apparatus body and air preheater are existing equipment commonly used in the art, unnecessary for avoiding, and excessively do not describe.
Typically every Thermal generation unit has two scr denitrification apparatus, is traditionally referred to as in the industry a side and b side.
The application spray ammonia district grid valve can remote manual or automatically adjust, preferably automated regulation, the foundation of regulation is upper
State multiple spot mixed sampling device areal sampling, each subregion nox mean concentration measuring successively through nox in-line analyzer.
In order to be further ensured that accuracy and the convenience of nox measurement, the multidraw section of multiple spot mixed sampling device is by 6
～12 multidraw rifle compositions；Transition linkage section includes and multidraw rifle same amount of sampling arm, multidraw rifle
Correspond with sampling arm, the corresponding sampling arm connection of every multidraw rifle, every sampling arm is equipped with
Sampling control valve；Smoke mixing section includes sampling main pipe, and all of sampling arm converges to sampling main pipe, and sampling main pipe is provided with
Nox in-line analyzer；Multidraw rifle is arranged along scr flue outlet width, and sampling main pipe is with air preheater flue outlet even
Logical.
Preferably, above-mentioned multidraw rifle the arrangement quantity of width and position according to the number of upstream ammonia-spraying grid and
Depending on the arrangement of space, further preferably, the area equation that every corresponding ammonia-spraying grid of multidraw rifle covers；Spray ammonia lattice
Grid are equal with spray ammonia manual modulation valve quantity, one-to-one corresponding.
Above-mentioned ammonia-spraying grid is existing usual means in scr denitrification apparatus.
In order to further ensure that the uniformity of spray ammonia, spray ammonia arm is divided into 3～5 groups；Sampling arm is divided into 3～5 groups, sprays ammonia
The group number of arm is consistent and mutually corresponding with the group number of sampling arm.
Above-mentioned spray ammonia arm is divided into 3～5 groups, namely spray ammonia main pipe branches into 3～5 spray ammonia subregion main pipes, every spray ammonia
The corresponding one group of spray ammonia arm of subregion main pipe.
When opening one of which and sampling the sampling control valve on arm and close other groups, then automatically extract respective partition
Flue gas aggregate sample, thus learn nox removal effect in this subregion.
Above-mentioned sampling control valve opens and closes successively by group, can record scr and export each subregion nox mean concentration, from
And it is control and the regulation offer foundation of above-mentioned spray ammonia district grid valve.
Above-mentioned sampling control valve opens and closes successively one by one, can record different positions on scr flue outlet width
Put nox concentration distribution situation, thus manually adjusting offer foundation for the scene of above-mentioned spray ammonia manual modulation valve.
Opened and closed successively by sampling control valve, realization patrols survey to scr outlet nox concentration distribution, and it is prominent excellent
Gesture is embodied in: only measures each point or each subregion nox concentration with a set of nox in-line analyzer, not only reduces investment and safeguard work
Measure, and nox in-line analyzer itself meter error affects very on the evaluation of scr flue outlet nox uniform concentration distribution
Little, be conducive to improving total system reliability and degree of regulation.
Above-mentioned sampling control valve opens and closes successively by group, is conducive to shortening and patrols the time surveying one time, thus reduce patrolling
The possibility to flue gas flow field and the impact of nox concentration distribution for the working conditions change during survey, and then be conducive to improving spray ammonia district grid
The control of valve and degree of regulation.
Above-mentioned sampling control valve opens and closes successively one by one, patrols and surveys time of one time and accordingly extend, but surveys under this pattern
Amount data is not used to system and automatically adjusts, but guide field manually adjusts spray ammonia manual modulation valve, participant during adjustment
Member can manual intervention, be also convenient for judging the stability of operating mode, therefore, patrol under this pattern survey scr export nox concentration be distributed in detail
The effectiveness of data is still ensured.
Above-mentioned a set of multiple spot mixed sampling device, by sampling the different working modes switching of control valve, realizes taking respectively
It is engaged in, in spray ammonia partitioning control valve and spray ammonia hand control valve, if excavating its expanded function further, also to serve spray ammonia total amount
Control valve, is " killing three birds with one stone ", specific implementation is: takes on the sampling arm 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.
For retrofitted unit, it is investment reduction it is preferable that the above-mentioned sampling of former cems systematic survey that reuses bypasses nox in main pipe
Concentration.
In order to improve the automaticity of system it is preferable that scr outlet nox concentration monitoring device, also include collection and control
Module, collection and control module at least receive nox in-line analyzer and the transmission signal of sampling control valve.Collection and control module
Realize with reference to existing known technology in row.
The direction in downstream namely the direction of flow of flue gas are swum on the application.
In order to prepare conveniently, cost-effective, ensure simultaneously the convenience sampling with accuracy it is preferable that multiple spot mixed sampling
Device is made using the tubing that internal diameter is 20～100mm, and that is, cross section (flow area) is circle.
In order to take into account representativeness and the real-time of smoke sampling, and prevent thief hole from blocking up ash it is preferable that multidraw section takes
Sample hole is circular hole, and the internal diameter of thief hole is 6～18mm, and thief 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, thief hole at least 3 and back of the body air-flow setting, the circulation area summation of all thief holes is not more than
The 40% of multidraw section actual internal area.
Air-flow is met in multidraw section wall side, and opposite side carries on the back air-flow, and thief hole is arranged on back of the body air-flow side, can try one's best
Down-sample the dust content of flue gas.
Block up the possibility of ash in order to reduce above-mentioned multidraw device further, scr exports nox concentration monitoring device, also wraps
Include hot blast blowback subsystem, the preferred heat primary air of source of the gas of hot blast blowback subsystem.Above-mentioned hot blast blowback subsystem at least includes
Blowback pipeline, blowback control valve and blowback isolating valve, blowback isolating valve is located in smoke mixing section, and blowback control valve is located at blowback
On pipeline, and blowback pipeline connects smoke mixing section, is located at blowback isolating valve upstream.When come into operation hot blast blowback subsystem when, instead
Blow isolating valve closing, blowback control valve is opened；And during measuring system bringing normally into operation, blowback isolating valve is opened, blowback control valve is closed
Close.
In order to convert nox concentration distribution under benchmark oxygen amount, scr exports nox concentration monitoring device, also includes o2On-line analyses
Instrument, o2In-line analyzer is also provided in smoke mixing section.Preferably, o2In-line analyzer and the integrated use of nox in-line analyzer.
Export the reliability of nox concentration monitoring device in order to improve above-mentioned scr it is preferable that nox in-line analyzer is straight cutting
Formula, using semiconductive ceramic gas sensor, can be under flue gas environment below 500 DEG C for the long-term work.
The spray ammonia method of adjustment of above-mentioned scr denitrification apparatus, exports, according to scr, the nox obtaining in nox concentration monitoring device dense
Degree, controls spray ammonia total using the spray total adjustable valve of ammonia, spray ammonia district grid valve and spray ammonia manual modulation valve three-level regulating valve series connection
Amount and uniformity.
Using periodicity self-regulation mode, during each period modulation, ensure the average of all spray ammonia district grid valves
Aperture is basically unchanged.I.e. while reducing aperture, part spray ammonia district grid valve increases part spray ammonia district grid valve therewith
Aperture, and the amplitude that reduces is roughly the same with the amplitude of increase.
Applicant it has been investigated that, prior art to adjust 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, and therefore novelty proposes " spray ammonia overall control valve
The technical scheme of+spray ammonia district grid valve+spray ammonia manual modulation valve ".
For ensureing the uniformity of spray ammonia, take into account reliability and the promptness of adjustment, preferably the spray ammonia side of optimizing and revising simultaneously
Method is: comprises the steps:
A, scr flue outlet is approximately divided into 3～5 subregions, patrols survey using scr outlet nox concentration monitoring device each
Subregion nox mean concentration, that is, sample control valve and open and close by group successively；
B, the nox mean concentration measured value on-line automatic adjustment spray ammonia district grid valve according to step a gained, each to ensure
Subregion nox mean concentration approximately equal, wherein, spray ammonia district grid valve sets aperture regulation interval, that is, limit the upper limit and lower limit,
When needing out-of-limit regulation ability leveling each subregion nox mean concentration, just prompting need to carry out spraying the artificial tune of ammonia manual modulation valve
Whole, before manually adjusting spray ammonia manual modulation valve, first spray ammonia district grid valve is manually set in the interval centre of aperture regulation
Position, that is, the upper limit and the intermediate valve position of lower limit, are then switched to sample the pattern that control valve opens and closes successively one by one, obtain
Take more detailed scr outlet nox concentration distribution data, refinement adjustment spray ammonia manual modulation valve, to ensure scr flue outlet width
As far as possible uniformly, adjustment switches spray ammonia district grid valve to auto state to degree direction nox concentration distribution again after finishing.
The technological thought that above-mentioned spray ammonia optimizes and revises method embodiment is: coarse adjustment spray ammonia district grid valve automatically, to adapt to scr
Inlet flue gas flow field and the change of nox concentration distribution, thus improving the uniformity of scr entrance ammonia nitrogen mol ratio, namely are based on scr
Catalyst maximum denitration ability improves the uniformity that scr exports nox concentration distribution；When in certain valve opening interval range,
Automatically coarse adjustment spray ammonia district grid valve, it cannot be guaranteed that scr outlet nox concentration distribution is relatively uniform, that is, illustrates scr inlet flue gas
The change of flow field and nox concentration distribution is very greatly it is necessary to ammonia manual modulation valve is sprayed in manual fine tuning, thus realization adjustment spray on demand
Ammonia uniformity.
The NM technology of the present invention is all with reference to prior art.
The spray ammonia method of adjustment of scr denitrification apparatus of the present invention, by exporting nox mean concentration and nox concentration distribution to scr
It is monitored, General Promotion sprays the quality that ammonia controls, including the accuracy improving spray ammonia uniformity and lifting spray ammonia overall control,
The emphasis of whole system design aspect is highly integrated, has the significant advantages such as reduced investment, reliability height.
Brief description
Fig. 1 sprays the design schematic diagram of ammonia adjusting means for prior art.
Fig. 2 is the design schematic diagram spraying ammonia adjusting means in the present invention.
Fig. 3 is scr outlet nox concentration monitoring device scheme of installation in the present invention.
Fig. 4 is the design schematic diagram that in the embodiment of the present invention 1, scr exports nox concentration monitoring device.
Fig. 5 is the design schematic diagram that in the embodiment of the present invention 2, scr exports nox concentration monitoring device.
Fig. 6 is the design schematic diagram that in the embodiment of the present invention 3, scr exports nox concentration monitoring device.
In figure, 1 is scr flue outlet, and 2 is air preheater flue outlet, and 3 is spray ammonia overall control valve, and 4 is spray ammonia main pipe, 5
For spraying ammonia manual modulation valve, 6 is spray ammonia arm, and 7 is spray ammonia district grid valve, and 8 is spray ammonia subregion main pipe, and 9 take for multiple spot mixing
Sampling device, 10 is nox and/or o2In-line analyzer, 11 is multidraw section, and 12 is transition linkage section, and 13 is smoke mixing section,
14 is multidraw rifle, and 15 is sampling control valve, and 16 is sampling bypass branch, and 17 is sampling bypass main pipe, and 18 is former cems system
System, 19 is blowback pipeline, and 20 is blowback control valve, and 21 is blowback isolating valve, and 30 is air preheater.
Specific embodiment
For a better understanding of the present invention, it is further elucidated with present disclosure with reference to embodiment, but the present invention
Content is not limited solely to the following examples.
Embodiment 1
Scr denitrification apparatus as shown in Figure 2 spray ammonia adjusting means, including spray ammonia main pipe；Spray ammonia main pipe branches into three
Spray ammonia subregion main pipe, every spray ammonia subregion main pipe branches into three spray ammonia arms；Respectively it is provided with spray ammonia on every spray ammonia arm
Manual modulation valve, every spray ammonia subregion main pipe is respectively provided with spray ammonia district grid valve, the spray ammonia main pipe before non-branch sets
There is the spray total adjustable valve of ammonia.
Scr denitrification apparatus as shown in Figure 3, including denitrification apparatus body, denitrification apparatus body include scr flue entrance and
Scr flue outlet, also comprises above-mentioned scr denitrification apparatus spray ammonia adjusting means and scr outlet nox concentration monitoring device；
Scr denitrification apparatus spray ammonia adjusting means is arranged on outside scr flue entrance, and sprays ammonia into scr denitrification apparatus；
Scr outlet 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 linkage 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 with 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 up of 9 multidraw rifles；Transition linkage section include with
Multidraw rifle same amount of sampling arm, multidraw rifle and sampling arm correspond, every multidraw rifle and its
Corresponding sampling arm connection, every sampling arm is equipped with sampling control valve；Smoke mixing section includes sampling main pipe, owns
Sampling arm converge to sampling main pipe, sampling main pipe is provided with nox in-line analyzer；Multidraw rifle is along scr flue outlet
Width is arranged, and sampling main pipe is connected with air preheater flue outlet.
Above-mentioned multidraw rifle is in the arrangement quantity of width and position according to the number of upstream ammonia-spraying grid and space
Depending on arrangement, the area equation that every corresponding ammonia-spraying grid of multidraw rifle covers；Ammonia-spraying grid is adjusted manually with spray ammonia
Section valve quantity is equal, one-to-one corresponding.
Above-mentioned ammonia-spraying grid is existing usual means in scr denitrification apparatus.
Above-mentioned spray ammonia arm has 3 groups；Sampling arm have 3 groups, spray ammonia arm group number with sample arm group number consistent and
Mutually corresponding.
When opening one of which and sampling the sampling control valve on arm and close other groups, then automatically extract respective partition
Flue gas aggregate sample, thus learn nox removal effect in this subregion.
Above-mentioned sampling control valve opens and closes successively by group, can record scr and export each subregion nox mean concentration, from
And it is control and the regulation offer foundation of above-mentioned spray ammonia district grid valve.
Above-mentioned sampling control valve opens and closes successively one by one, can record different positions on scr flue outlet width
Put nox concentration distribution situation, thus manually adjusting offer foundation for the scene of above-mentioned spray ammonia manual modulation valve.
Multiple spot mixed sampling device adopts the tubing that internal diameter is 80mm to make, and the tube wall of multidraw rifle is provided with sampling
Hole；Thief hole is circular hole, and the internal diameter of thief hole is 12mm, thief hole at least 3 and carry on the back air-flow along the length side of multidraw rifle
To being evenly arranged, the circulation area summation of all thief holes is not more than the 40% of multidraw rifle cross-sectional area；
Above-mentioned multiple spot mixed sampling device is taken also to include o2In-line analyzer, o2In-line analyzer and nox in-line analyzer collection
Become to use, be located in smoke mixing section.
Above-mentioned nox in-line analyzer be direct insertion, using semiconductive ceramic gas sensor, can long-term work at 500 DEG C
Under following flue gas environment.
The spray ammonia method of adjustment of above-mentioned scr denitrification apparatus, exports, according to scr, the nox obtaining in nox concentration monitoring device dense
Degree, controls spray ammonia total using the spray total adjustable valve of ammonia, spray ammonia district grid valve and spray ammonia manual modulation valve three-level regulating valve series connection
Amount and uniformity, specifically include following steps:
A, scr flue outlet is approximately divided into 3 subregions, patrols each subregion of survey using scr outlet nox concentration monitoring device
Nox mean concentration, that is, sample control valve and open and close by group successively；
B, the nox mean concentration measured value on-line automatic adjustment spray ammonia district grid valve according to step a gained, each to ensure
Subregion nox mean concentration approximately equal, wherein, it is 60%～80% that spray ammonia district grid valve sets aperture regulation interval, that is, limit
Determine the upper limit be 80%, lower limit be 60%, when need out-of-limit regulation could leveling each subregion nox mean concentration when, just point out to enter
Manually adjusting of row spray ammonia manual modulation valve, before manually adjusting spray ammonia manual modulation valve, manual spraying ammonia district grid valve first
It is set in the interval centre position of aperture regulation, that is, 70%, it is then switched to sample what control valve opened and closed successively one by one
Pattern, obtains more detailed scr and exports nox concentration distribution data, refinement adjustment spray ammonia manual modulation valve, to ensure scr cigarette
As far as possible uniformly, adjustment switches spray ammonia district grid valve to auto state to road outlet width nox concentration distribution again after finishing.
Embodiment 2
Substantially the same manner as Example 1, except that: take multiple spot mixed sampling device also to include hot blast blowback subsystem,
The source of the gas of hot blast blowback subsystem is heat primary air；Hot blast blowback subsystem at least includes blowback pipeline, blowback control valve and anti-
Blow isolating valve, blowback isolating valve is located in smoke mixing section, blowback control valve is located on blowback pipeline, blowback pipeline connects flue gas
Mixing section and be located at blowback isolating valve upstream.
Embodiment 3
Substantially the same manner as Example 1, except that: take on the sampling arm 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 former cems systematic survey above-mentioned sampling that reuses bypass main pipe, as spray ammonia overall control
The principal parameter that valve controls, thus improve the quality of spray ammonia overall control further.
Embodiment 4
Substantially the same manner as Example 1, except that: spray ammonia main pipe branches into 5 spray ammonia subregion main pipes, and every spray ammonia divides
Area's main pipe branches into 6 spray ammonia arms.
Claims (10)
1. a kind of scr denitrification apparatus with spray ammonia adjusting means it is characterised in that: include spray ammonia main pipe；Spray ammonia main pipe branches into 3～
5 spray ammonia subregion main pipes, every sprays the spray ammonia arm that ammonia subregion main pipe branches into more than two；On every spray ammonia arm respectively
It is provided with spray ammonia manual modulation valve, every spray ammonia subregion main pipe is respectively provided with spray ammonia district grid valve, the spray ammonia before non-branch
Main pipe Upstream section is provided with the spray total adjustable valve of ammonia.
2. a kind of scr denitrification apparatus, including denitrification apparatus body, denitrification apparatus body includes scr flue entrance and scr flue goes out
Mouthful it is characterised in that: also comprise described in claim 1 scr denitrification apparatus spray ammonia adjusting means and scr export nox concentration
Monitoring device；
Scr denitrification apparatus spray ammonia adjusting means is arranged on outside scr flue entrance, and sprays ammonia into scr denitrification apparatus；
Scr outlet nox concentration monitoring device includes multiple spot mixed sampling device and nox in-line analyzer, and multiple spot mixed sampling fills
Put including the multidraw section being sequentially communicated, transition linkage section and smoke mixing section；Multidraw section is located at scr flue outlet,
Smoke mixing section is connected with air preheater flue outlet；Nox in-line analyzer is arranged in smoke mixing section.
3. scr denitrification apparatus as claimed in claim 2 it is characterised in that: the multidraw section of multiple spot mixed sampling device is by 6
～12 multidraw rifle compositions；Transition linkage section includes and multidraw rifle same amount of sampling arm, multidraw rifle
Correspond with sampling arm, the corresponding sampling arm connection of every multidraw rifle, every sampling arm is equipped with
Sampling control valve；Smoke mixing section includes sampling main pipe, and all of sampling arm converges to sampling main pipe, nox in-line analyzer
It is located in sampling main pipe；Multidraw rifle is arranged along scr flue outlet width, and sampling main pipe is with air preheater flue outlet even
Logical.
4. scr denitrification apparatus as claimed in claim 3 it is characterised in that: the corresponding spray ammonia lattice of every multidraw rifle
The area equation that grid cover；Ammonia-spraying grid is equal with spray ammonia manual modulation valve quantity, one-to-one corresponding.
5. scr denitrification apparatus as claimed in claim 3 it is characterised in that: spray ammonia arm be divided into 3～5 groups；Sampling arm is divided into
3～5 groups, the group number of spray ammonia arm is consistent and mutually corresponding with the group number quantity of sampling arm.
6. scr denitrification apparatus as claimed in claim 3 it is characterised in that: take on the sampling arm of multiple spot mixed sampling device,
And each upstream sampling control valve, connect a sampling bypass branch respectively, each bypass branch is collected to sampling bypass main pipe, is taking
Nox concentration is surveyed in sample bypass main pipe.
7. scr denitrification apparatus as claimed in claim 3 it is characterised in that: multiple spot mixed sampling device adopt internal diameter be 20～
The tubing of 100mm makes, and the tube wall of multidraw rifle is provided with thief hole；Thief hole is circular hole, the internal diameter of thief hole is 6～
18mm, thief hole at least 3 and back of the body air-flow are evenly arranged along the length direction of multidraw rifle, the circulating face of all thief holes
Long-pending summation is not more than the 40% of multidraw rifle cross-sectional area.
8. scr denitrification apparatus as claimed in claim 2 or claim 3 it is characterised in that: scr outlet nox concentration monitoring device also include
Hot blast blowback subsystem, the source of the gas of hot blast blowback subsystem is heat primary air；Hot blast blowback subsystem at least include blowback pipeline,
Blowback control valve and blowback isolating valve, blowback isolating valve is located in smoke mixing section, and blowback control valve is located on blowback pipeline, instead
Blowpipe road connects smoke mixing section and is located at blowback isolating valve upstream.
9. the scr denitrification apparatus described in claim 2-8 any one spray ammonia method of adjustment it is characterised in that: gone out according to scr
The nox concentration obtaining in mouth nox concentration monitoring device, manual using the spray total adjustable valve of ammonia, spray ammonia district grid valve and spray ammonia
The series connection of regulating valve three-level regulating valve controls spray ammonia total amount and uniformity.
10. method as claimed in claim 9 it is characterised in that: comprise the steps:
A, scr flue outlet is divided into 3～5 subregions, patrols each subregion nox of survey using scr outlet nox concentration monitoring device and put down
All concentration, that is, sample control valve and open and close by group successively；
B, the nox mean concentration measured value on-line automatic adjustment spray ammonia district grid valve according to step a gained, to ensure each subregion
Nox mean concentration is equal, and wherein, spray ammonia district grid valve sets aperture regulation interval, that is, limit the upper limit and lower limit, when needs are got over
During limit regulation ability leveling each subregion nox mean concentration, just prompting need to carry out spraying manually adjusting of ammonia manual modulation valve, artificial tune
Before whole spray ammonia manual modulation valve, first spray ammonia district grid valve is manually set in the interval centre position of aperture regulation, that is, go up
Limit and the intermediate valve position of lower limit, are then switched to sample the pattern that control valve opens and closes successively one by one, obtain more detailed
Thin scr outlet nox concentration distribution data, refinement adjustment spray ammonia manual modulation valve, to ensure scr flue outlet width
As far as possible uniformly, adjustment switches spray ammonia district grid valve to auto state to nox concentration distribution again after finishing.
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| CN108344604A (en) * | 2018-04-11 | 2018-07-31 | 华南理工大学 | A kind of SCR reative cells NOXThe online data-logger of concentration and control method |
| CN108380043A (en) * | 2018-02-12 | 2018-08-10 | 南京博沃科技发展有限公司 | A kind of SCR denitration device subregion spray ammonia adjustment control method |
| CN108664006A (en) * | 2018-07-02 | 2018-10-16 | 大唐环境产业集团股份有限公司 | It is a kind of that ammonia optimization method and system are intelligently sprayed based on the SCR denitration of zonal control and Dynamic matrix control |
| CN109603525A (en) * | 2018-12-27 | 2019-04-12 | 浙江浙能温州发电有限公司 | A kind of denitration subregion spray ammonia control method based on unevenness judgement |
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| CN112717670A (en) * | 2020-12-18 | 2021-04-30 | 华能陇东能源有限责任公司 | Control device and control method for ammonia injection grid of denitration system |
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| CN110568129B (en) * | 2019-09-26 | 2024-03-12 | 国能龙源环保有限公司 | SCR denitration outlet mixing and zoning flue gas NOx concentration detection system and method thereof |
| CN110694475B (en) * | 2019-11-04 | 2023-09-05 | 中国华电科工集团有限公司 | Accurate ammonia spraying device and method for denitration SCR reactor of thermal power plant |
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| WO2021129176A1 (en) * | 2019-12-23 | 2021-07-01 | 北京国电龙源环保工程有限公司 | Deployment method for gas measurement system |
| CN111044689A (en) * | 2020-01-13 | 2020-04-21 | 南京科远智慧科技集团股份有限公司 | Monitoring system and method for synchronously sampling and asynchronously analyzing smoke parameter distribution |
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| CN114259855A (en) * | 2021-12-27 | 2022-04-01 | 国能神皖安庆发电有限责任公司 | Denitration system and control method thereof |
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Denomination of invention: A SCR denitrification device, its ammonia injection adjustment device, and its ammonia injection adjustment method Effective date of registration: 20231205 Granted publication date: 20190329 Pledgee: Zhejiang Qingtian Rural Commercial Bank Co.,Ltd. Gaohu Branch Pledgor: Zhejiang Xinghe Intelligent Control Technology Co.,Ltd. Registration number: Y2023980069268 |
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