CN109445383A - A kind of SCR subregion spray ammonia optimal control method of the preposition static mixer of band - Google Patents
A kind of SCR subregion spray ammonia optimal control method of the preposition static mixer of band Download PDFInfo
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- CN109445383A CN109445383A CN201811182349.6A CN201811182349A CN109445383A CN 109445383 A CN109445383 A CN 109445383A CN 201811182349 A CN201811182349 A CN 201811182349A CN 109445383 A CN109445383 A CN 109445383A
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- ammonia
- static mixer
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- nox
- preposition
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM]
- G05B19/41865—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM] characterised by job scheduling, process planning, material flow
-
- 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
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/32—Operator till task planning
- G05B2219/32252—Scheduling production, machining, job shop
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Abstract
A kind of SCR subregion of the preposition static mixer of band of the invention sprays ammonia optimal control method, is related to energy environment protection technical field more particularly to thermal power plant selective catalytic reduction denitration technology field.Using " preposition static mixer " key technology, by have patrol high range CMES analysis system of the brake with matrix samples device 1., ammonia-spraying grid 2., preposition static mixer 3., SCR reactor 4., have patrol lower range CMES analysis system of the brake with matrix samples device 5., the control module that has artificial intelligence software 6., remotely controls to adjust module and 7. forms.Simple and ingenious structure improves denitration efficiency, and it is obvious to reduce ammonia consumption effect.
Description
Technical field
A kind of SCR subregion of the preposition static mixer of band of the invention sprays ammonia optimal control method, is related to energy environment protection skill
The SCR subregion of art technical field more particularly to a kind of preposition static mixer of band sprays ammonia Optimized-control Technique field.
Background technique
In Large-scale machine set SCR denitration system, reducing agent ammonia sprays into flue by ammonia-gas spraying device and mixes with flue gas, spray ammonia control
The main mode adjusted using overall control, is turned by the N0x concentration of entrance, flue gas flow, ammonia nitrogen molar ratio and catalyst
It changes the data such as efficiency and calculates overall ammonia spraying amount, the ammonia flow for entering entire ammonia-spraying grid is set, and pass through outlet
N0x carry out feedback regulation ammonia flow, due to the variation of boiler load and combustion system, ammonia spraying device upstream under different operating conditions
Flue gas flow field is unevenly distributed in flue, and the distribution of nitrogen oxides in effluent is also very uneven, so that ammonia-gas spraying device is in practical fortune
Adjusting difficulty in row is quite big.Ammonia spraying amount control is improper, will directly influence the efficiency of denitration, influence NOx emission and escapes
Ammonia-spillage amount, and influence whether the service life of catalyst and the corrosion of downstream heat exchange element, to influence whole denitration operation
Cost and boiler efficiency.The present inventor establishes on the basis of the research of long campaigns denitrating flue gas and data sampling analysis, uses
A kind of preposition mixer realizes the optimization of SCR flue gas flow field, and the structure of the device is simple, and manufacture is easy for installation, can make random
Then non-uniform flow field realizes that regional area is uniform, and cooperation sprays ammonia optimal control method using subregion, and realization is precisely controlled.
Of the invention succeeds in developing, and efficiently solves deficiency, defect and disadvantage existing for existing well-known technique and status, reduces
Spray ammonia adjusts difficulty, improves the denitration efficiency of SCR denitration system, reduces the escaping of ammonia.
Summary of the invention
The present invention takes " the SCR subregion spray ammonia optimal control of preposition static mixer " key technology, based on to denitration system
Ammonia-spraying grid, the analysis of flue geometry and the initial data of uniting measure, and using CFD flow field simulation, stream field is calculated
Long and narrow flue (section) is divided into 3-4 region by installing preposition static mixing device additional by analysis so that in region NOX with
NH3 is sufficiently mixed uniformly, in each region installing have patrol brake with matrix samples device CMES analysis system and
Corresponding regulating device draws up corresponding control strategy, adjusts corresponding spray ammonia region in real time automatically by remotely controlling to adjust module
Ammonia spraying amount, realize subregion precisely spray ammonia.
The purpose reached through the invention is: 1., the present invention take " preposition static mixing device " key equipment, solve
When unit load and combustion conditions change, there is random non-uniform flow field and spray ammonia is caused to adjust difficulty in denitration flue
Problem.2., apparatus of the present invention structure is simple, system is easy to control, solve the problems, such as that conventional to spray ammonia optimization plant investment at high cost.
3., the present invention take " SCR subregion spray ammonia optimal control " key technology, using matrix samples mode, realize that subregion accurately measures,
Differential spray ammonia solves conventional single point measurement and does not have representativeness, causes to spray the problem that ammonia adjusts difficulty under different operating conditions.④,
The present invention takes " SCR subregion spray ammonia optimal control " key technology, using artificial intelligence control software technology, by ammonia spraying amount with
SCR inlet NOx concentration is associated, while being modified with the outlet SCR NOx, ammonia slip concentration, and measurement and control precision are solved
The not high problem for causing SCR the escaping of ammonia rate big improves denitration efficiency.5., of the invention scientific and reasonable for structure and simple ingenious, side
Just using and effect stability be reliable, easy to production with use and cost of manufacture and operation cost it is low, with science, it is advanced
Property, accuracy, representativeness, practicability.6., the present invention solve deficiency existing for existing well-known technique and status, defect and disadvantage
End., it is of the invention succeed in developing, effectively improved the technical level of the industry, can wide popularization and application.
To achieve the above object, technical solution provided by the invention are as follows:
The SCR subregion of the preposition static mixer of band sprays ammonia Optimal Control System, including has and patrol brake and take with matrix
The high range CMES analysis system of sampling device 1., ammonia-spraying grid 2., preposition static mixer 3., SCR reactor 4., have and patrol survey
Function with matrix samples device lower range CMES analysis system 5., have the control module of artificial intelligence software 6., remotely
Module is controlled to adjust 7. (see attached drawing 1).
The preposition static mixer 3., ammonia-spraying grid 2. before arrange one layer (several), ammonia-spraying grid 2. after cloth
Set one layer (several), it is each to arrange 3. a static mixer forms a flue gas composition concentration mixing along flue width direction
3. several static mixers are arranged along flue width direction in uniform region, and adjacent mixer is 3. along line of demarcation mirror image
It is arranged symmetrically.3. the static mixer, is made of two groups of blades (see attached drawing 2), two groups of blades are respectively in respective region
Interior rotation mixing and contrary.It is characterized in that flue gas passes through two groups of blades, whirlpool is formed, since shear velocity is different everywhere
Sample, nitrogen oxides in effluent and ammonia are sufficiently mixed, and achieve the purpose that even concentration in mixed cell.
It is described have patrol high range CMES analysis system of the brake with matrix samples device 1., have and patrol brake
5. lower range CMES analysis system with matrix samples device, respectively includes sampling branch pipe I (3-4 set), II (3- of mixer
4 sets), sampling probe interface flange III (3-4 set), flue IV (see attached drawing 3), live pick-up case, gas analyzer；Each static state
3. mixer arranges that one group of sampling detecting device, sampling probe are connected by sampling pipe with gas analyzer, gas analyzer institute
6. data input has the control module of artificial intelligence software, 6. the control module for having artificial intelligence software passes through conversion
Afterwards, it provides instruction and controls to adjust module 7. to long-range.
Has the control module of artificial intelligence software 6., principle is to control using serials control circuit, by each static state
It is uniformly mixed the ammonia spraying amount in region after mixing and has and patrols the high range CMES analysis system that brake has matrix samples device
1. the data such as measurement result, exhaust gas volumn, unit coal quality, load are associated, while being had with the outlet SCR and being patrolled brake with square
5. measurement result is modified the lower range CMES analysis system of battle array sampler.The serials control circuit, by main regulation
Circuit and secondary regulating loop composition.The main regulation circuit, the NOx content and flue gas detected by SCR inlet detection device
The product of flow obtains entrance NOx total amount, sets denitration efficiency=(import NOx total amount-outlet NOx total amount)/import NOx total amount,
By function fl(x) obtain different denitration efficiencies it is corresponding under molar ratio, the ratio of setting value and exit NOx concentration is through PID control
Device output order is added to fixed molar ratio as correction value, ultimately generates modified NH3/NOx molar ratio, generates pair and adjusts back
Road needs ammonia amount given value.The secondary regulating loop, required for providing SCR reactor according to modified NH3/NOx molar ratio
Ammonia total amount, feedforward amount is limited by speed limit and clipping module, ammonia flow setting value=entrance NOx flow × reality
Border NH3/NOx molar ratio.On the basis of fully considering denitration efficiency and catalyst denitration activity, exit NOx concentration is controlled
In reasonable range.
7. the long-range control and regulation module, using the linear preferable ball valve of adjustment, semisphere valve or diaphragm valve, meets essence
The requirement of fine control.
The working principle of the invention and the course of work are: as shown in Figure of description 2, the working principle of the invention and work
Process is extremely simple to be illustrated, and the present invention has given full play to the pass of " the SCR subregion spray ammonia optimal control with preposition static mixer "
The effect of key technology.In the SCR subregion spray ammonia optimal control method with preposition static mixer, described is preposition quiet
3., in ammonia-spraying grid, 2. 2. one layer (several) of preceding arrangement, ammonia-spraying grid arrange one layer (several), every layer of edge to state mixer afterwards
3. flue width direction arranges several static mixers, arrange several static mixers 3. along flue width direction, and phase
Adjacent mixed cell is arranged along line of demarcation mirror symmetry.After flue gas passes through static mixer, flue gas fills in respective region
Point mixing, reduces in the region speed of each component and concentration gradient distribution in flue gas, guarantees to enter cigarette before SCR reactor
Gas is uniformly mixed, and is effectively reduced and is adjusted difficulty and cost of investment, while to improve denitration efficiency, being reduced the escaping of ammonia rate and having been provided
Sharp condition.Under the action of " flue static mixer " key technology, brake is patrolled with matrix samples using described having
1. the high range CMES analysis system of device, effectively examines the mixed effect of static mixer 3., while having people for described
6. the control module of work intelligence software provides accurate data, have 6. adjusting that the control module of artificial intelligence software calculates
7. scheme sends long-range control and regulation module to, realize and precisely adjust, be finally reached raising denitration efficiency, reduce the escaping of ammonia rate
Purpose.
Of the invention design is scientific and reasonable, simple and ingenious structure, is easy to low manufacture cost, and using effect is reliable and stable, solution
Deficiency, defect and drawback existing for existing well-known technique of having determined and status, have effectively been increased to the technical level of the industry.
Due to use technical solution provided by the present invention so that the present invention with existing well-known technique compared with status,
The beneficial effect of acquisition is:
1, the present invention takes " preposition static mixer " key equipment, solves unit load and when combustion conditions change,
There is random non-uniform flow field and spray ammonia is caused to adjust difficult problem in denitration flue.
2, apparatus of the present invention structure is simple, system is easy to control, solves the problems, such as that conventional spray ammonia optimization plant investment is at high cost.
3, the present invention takes " SCR subregion sprays ammonia optimal control " key technology, using matrix samples mode, realizes subregion essence
Locating tab assembly, differential spray ammonia solve conventional single point measurement and do not have representativeness, causes to spray asking for ammonia adjusting difficulty under different operating conditions
Topic.
4, the present invention takes " SCR subregion sprays ammonia optimal control " key technology, will using artificial intelligence control software technology
Ammonia spraying amount is associated with SCR inlet NOx concentration, while being modified with the outlet SCR NOx, ammonia slip concentration, solve measurement and
The not high problem for causing SCR the escaping of ammonia rate big of precision is controlled, denitration efficiency is improved.
5, scientific and reasonable for structure and simple ingenious, convenient to use and effect stability of the invention is reliable, easy to production and makes
With and cost of manufacture and operation cost it is low, have science, advance, accuracy, representativeness, practicability.
6, the present invention solves deficiency existing for existing well-known technique and status, defect and drawback.
7, of the invention to succeed in developing, the technical level of the industry has been effectively improved, it can wide popularization and application.
Detailed description of the invention
Fig. 1 is the schematic diagram of the specific embodiment of the invention.
Label in figure: have patrol brake with matrix samples device high range CMES analysis system 1., spray ammonia lattice
Grid 2., preposition static mixer 3., SCR reactor 4., have the lower range CMES point with matrix samples device that patrols brake
Analysis system 5., have the control module of artificial intelligence software and 6., remotely control to adjust module 7.
Fig. 2 is preposition static mixer 3. schematic diagram in the specific embodiment of the invention
Label in figure: the label in figure: 1, dextrorotation blade, 2, left-handed blade, 3, dextrorotation blade, 4, left-handed blade, 5, spray ammonia
Grid, 6, flue.
Fig. 3 is to have to patrol high range CMES analysis system of the brake with matrix samples device in the specific embodiment of the invention
It unites 1. and has and patrol lower range CMES analysis system of the brake with matrix samples device 5. middle matrix samples schematic device
Label in figure: I, sampling branch pipe (3-4 set), II, mixer (3-4 set), III, sampling probe interface flange (3-4
Set), IV, flue.
Claims (10)
1. a kind of SCR subregion of preposition static mixer of band sprays ammonia optimal control method, it is characterised in that: patrol brake by having
High range CMES analysis system with matrix samples device 1., ammonia-spraying grid 2., preposition static mixer 3., SCR reactor
4., have patrol lower range CMES analysis system of the brake with matrix samples device 5., have the control of artificial intelligence software
Module 6., remotely controls to adjust module and 7. constitutes；The preposition static mixer 3. it is characterized by: by 1, dextrorotation blade, 2,
Left-handed blade, 3, dextrorotation blade, 4, left-handed blade, 5, flue, 6, ammonia-spraying grid composition.
2. a kind of SCR subregion of the preposition static mixer of band according to claim 1 sprays ammonia optimal control method, feature
Be: 6. its principle is to control using serials control circuit the control module for having artificial intelligence software, by each static state
After mixing be uniformly mixed region ammonia spraying amount with have patrol brake have matrix samples device CMES analysis system 1. measure
As a result, the data such as exhaust gas volumn, unit coal quality, load are associated, while being had with the outlet SCR and being patrolled brake with matrix samples
5. measurement result is modified the CMES analysis system of device.
3. according to claim 2, the control module for having artificial intelligence software 6., by main regulation circuit and pair
Regulating loop composition.
4. main regulation circuit described in, the product of the NOx content and flue gas flow that are detected by SCR inlet detection device are entered
Mouth NOx total amount, sets denitration efficiency=(import NOx total amount-outlet NOx total amount)/import NOx total amount, is obtained by function fl(x)
The ratio of molar ratio under different denitration efficiencies are corresponding, setting value and exit NOx concentration is used as through PID controller output order to be repaired
On the occasion of the fixed molar ratio that is added to, modified NH3/NOx molar ratio is ultimately generated, generate secondary regulating loop needs ammonia amount given
Value.
Secondary regulating loop described in 5., ammonia total amount required for providing SCR reactor according to modified NH3/NOx molar ratio,
Feedforward amount is limited by speed limit and clipping module, ammonia flow setting value=entrance NOx flow × practical NH3/NOx rubs
That ratio.
6. exit NOx concentration is controlled in reasonable model on the basis of fully considering denitration efficiency and catalyst denitration activity
In enclosing.
7. a kind of SCR subregion of the preposition static mixer of band according to claim 1 sprays ammonia optimal control method, feature
Be: 3., in ammonia-spraying grid, 2. 2. one layer (several) of preceding arrangement, ammonia-spraying grid arrange one to the preposition static mixer afterwards
3. layer (several), each static mixer along flue width direction arrangement form what a flue gas composition concentration was uniformly mixed
Region.
8. a kind of SCR subregion of the preposition static mixer of band according to claim 1 sprays ammonia optimal control method, feature
Be: 3. adjacent mixer is arranged along line of demarcation mirror symmetry.
3. 9. static mixer described in, is made of two groups of blades, two groups of blades respectively in respective region rotation mixing and
It is contrary.
10. forming whirlpool, since shear velocity is different everywhere, nitrogen oxygen in flue gas it is characterized in that flue gas passes through two groups of blades
Compound and ammonia are sufficiently mixed, and achieve the purpose that even concentration in mixed cell.
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| CN201811182349.6A CN109445383A (en) | 2018-10-11 | 2018-10-11 | A kind of SCR subregion spray ammonia optimal control method of the preposition static mixer of band |
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| CN201811182349.6A CN109445383A (en) | 2018-10-11 | 2018-10-11 | A kind of SCR subregion spray ammonia optimal control method of the preposition static mixer of band |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110469864A (en) * | 2019-08-08 | 2019-11-19 | 湖南大唐节能科技有限公司 | A kind of SCR subregion spray ammonia optimal control method of the preposition static mixer of band |
| CN110568129A (en) * | 2019-09-26 | 2019-12-13 | 北京国电龙源环保工程有限公司 | SCR denitration outlet mixing and partition flue gas NOx concentration detection system and method thereof |
| CN110967455A (en) * | 2019-12-23 | 2020-04-07 | 北京国电龙源环保工程有限公司 | Gas measurement and control system and application in denitration flue gas detection |
| CN111135683A (en) * | 2020-02-27 | 2020-05-12 | 上海三融环保工程有限公司 | SNCR (selective non-catalytic reduction) out-of-stock automatic control method and system |
| CN112705046A (en) * | 2020-12-16 | 2021-04-27 | 苏州西热节能环保技术有限公司 | Denitration ammonia injection fine adjustment method and device |
| CN114870627A (en) * | 2022-05-30 | 2022-08-09 | 西安热工研究院有限公司 | SCR denitration partitioned accurate ammonia injection control method and system for coal-fired power plant |
| CN116139695A (en) * | 2023-04-21 | 2023-05-23 | 北京北科欧远科技有限公司 | Denitration reactor, installation method thereof and ammonia spraying denitration method |
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2018
- 2018-10-11 CN CN201811182349.6A patent/CN109445383A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110469864A (en) * | 2019-08-08 | 2019-11-19 | 湖南大唐节能科技有限公司 | A kind of SCR subregion spray ammonia optimal control method of the preposition static mixer of band |
| CN110568129A (en) * | 2019-09-26 | 2019-12-13 | 北京国电龙源环保工程有限公司 | SCR denitration outlet mixing and partition flue gas NOx concentration detection system and method thereof |
| 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 |
| CN110967455A (en) * | 2019-12-23 | 2020-04-07 | 北京国电龙源环保工程有限公司 | Gas measurement and control system and application in denitration flue gas detection |
| CN110967455B (en) * | 2019-12-23 | 2021-03-12 | 北京国电龙源环保工程有限公司 | Gas measurement and control system and application in denitration flue gas detection |
| CN111135683A (en) * | 2020-02-27 | 2020-05-12 | 上海三融环保工程有限公司 | SNCR (selective non-catalytic reduction) out-of-stock automatic control method and system |
| CN112705046A (en) * | 2020-12-16 | 2021-04-27 | 苏州西热节能环保技术有限公司 | Denitration ammonia injection fine adjustment method and device |
| CN112705046B (en) * | 2020-12-16 | 2022-08-30 | 苏州西热节能环保技术有限公司 | Denitration ammonia injection fine adjustment method and device |
| CN114870627A (en) * | 2022-05-30 | 2022-08-09 | 西安热工研究院有限公司 | SCR denitration partitioned accurate ammonia injection control method and system for coal-fired power plant |
| CN114870627B (en) * | 2022-05-30 | 2023-08-01 | 西安热工研究院有限公司 | SCR denitration partition accurate ammonia injection control method and system for coal-fired power plant |
| CN116139695A (en) * | 2023-04-21 | 2023-05-23 | 北京北科欧远科技有限公司 | Denitration reactor, installation method thereof and ammonia spraying denitration method |
| CN116139695B (en) * | 2023-04-21 | 2023-08-25 | 北京北科欧远科技有限公司 | Denitration reactor, installation method thereof and ammonia spraying denitration method |
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Application publication date: 20190308 |