CN205627632U - High performance SCR minimum discharge control system based on subregion mixes to be adjusted - Google Patents
High performance SCR minimum discharge control system based on subregion mixes to be adjusted Download PDFInfo
- Publication number
- CN205627632U CN205627632U CN201620434612.6U CN201620434612U CN205627632U CN 205627632 U CN205627632 U CN 205627632U CN 201620434612 U CN201620434612 U CN 201620434612U CN 205627632 U CN205627632 U CN 205627632U
- Authority
- CN
- China
- Prior art keywords
- scr
- flue gas
- ammonia
- control system
- exhaust pass
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Treating Waste Gases (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The utility model discloses a high performance SCR minimum discharge control system based on subregion mixes to be adjusted, including SCR entry flue, a plurality of entry flue baffles, a plurality of exhaust pass baffles, SCR exhaust pass, DCS control system, ammonia input pipeline and SCR reactor, each flue baffle that enters the mouth is located the export of SCR entry flue, and the flue baffle that respectively enters the mouth the export of flue with SCR and divide into a plurality of entry flue gas passageways, each exhaust pass baffle is located SCR exhaust pass's entry, and each exhaust pass baffle divide into a plurality of export flue gas passageways with SCR exhaust pass's entry, wherein, all be equipped with ammonia injection grid in each flue gas passageway that enters the mouth, ammonia input pipeline is linked together with each ammonia injection grid's entry respectively, wherein each ammonia injection grid's entrance all is equipped with the governing valve, wherein, an entry flue gas passageway corresponds an export flue gas passageway. The utility model discloses can realize each subregion flue outlet's of SCR catalyst inlet ammonia and nitrogen oxide's homogeneous mixing.
Description
Technical field
This utility model belongs to energy-conserving and environment-protective field, relates to a kind of high property based on subregion mixing regulation
Can SCR minimum discharge control system.
Background technology
The spray ammonia of existing conventional scr system and hybrid technology, use and install in whole flue cross section
The ammonia-spraying grid of manually adjustable each subregion ammonia spraying amount, then use conventional static mixer promote ammonia with
Flue gas mixes.This mode requires that SCR inlet NOx distribution more uniformly and is stablized, root
According to SCR inlet NOx profile adjustment each manual modulation valve aperture, control each subregion and spray into reducing agent
Amount.The deficiency of this mode is:
1) aperture of each manual modulation valve of ammonia-spraying grid carries out spraying after ammonia optimizes and revises under certain operating mode,
Section ammonia nitrogen is more temporary transient than distribution becomes uniform.But, it is attributed to the operation change of combustion system, SCR
Entrance NOx distribution has a certain degree of change, and reducing agent distribution cannot divide by dynamic following NOx
The change of cloth, section ammonia nitrogen reduces than uniformity coefficient, and this is the intrinsic problem of conventional scr technology.
For the change of relatively common ± 30mg/m3, when exporting NOx and controlling at 100mg/m3 this
The problem of kind is the most notable.In the case of minimum discharge, outlet NOx is normally controlled in 35mg/m3
Left and right, it is more prominent that this problem becomes ratio.
2) SCR inlet flue mixing distance the most only tens meters, but cross dimensions generally reaches
10mX3m, mixes flue gas in cannot using static mixer on a large scale in this case,
Rely on flow field measure cannot be difficult to the problems referred to above；
Ammonia mixes uneven with NOx, SCR denitration efficiency will be caused the most up to standard or the escaping of ammonia
Situation about exceeding standard, and then cause the problems such as air preheater blocking.Change having been carried out minimum discharge
In the boiler made, this problem is commonplace.
Utility model content
The purpose of this utility model is the shortcoming overcoming above-mentioned prior art, it is provided that a kind of based on
The high-performance SCR minimum discharge control system of subregion mixing regulation, this system is capable of SCR
In gas approach, ammonia mixes with the uniform of nitrogen oxides.
For reaching above-mentioned purpose, high-performance based on subregion mixing regulation described in the utility model
If SCR minimum discharge control system includes that SCR inlet flue, some gas approach dividing plates are done
Mouth buffler, SCR exhaust pass, DCS control system, ammonia input channel and SCR are anti-
Answer device；
The outlet of SCR inlet flue is connected with the entrance of SCR reactor, SCR reactor
Outlet is connected with the entrance of SCR exhaust pass, and wherein, each gas approach dividing plate is positioned at SCR
In the outlet of gas approach, and the outlet of SCR inlet flue is divided into some by each gas approach dividing plate
Inlet flue gas passage, each exhaust pass dividing plate is positioned at the entrance of SCR exhaust pass, and respectively exports
The entrance of SCR exhaust pass is divided into some exiting flue gas passages, wherein, each entrance by buffler
Be equipped with ammonia-spraying grid in exhaust gases passes, ammonia input channel respectively with the entrance phase of each ammonia-spraying grid
Connection, the porch of the most each ammonia-spraying grid is equipped with regulation valve, is all provided with in each exiting flue gas passage
The detector for detecting its interior nitrous oxides concentration, the outfan of detector is had to control with DCS
The input of system is connected, and the outfan of DCS control system is connected with the control end of regulation valve
Connect, wherein, a corresponding exiting flue gas passage of inlet flue gas passage.
Described each inlet flue gas passage is sequentially distributed in the width direction, and each exiting flue gas passage is along width
Direction is sequentially distributed, and the aspect ratio of the most each inlet flue gas passage is equal to each exiting flue gas
The aspect ratio of passage.
The quantity of gas approach dividing plate is equal with the quantity of exhaust pass dividing plate.
Described detector is CEMS.
Be provided with static mixer in inlet flue gas passage, wherein static mixer be positioned at ammonia-spraying grid with
Between the entrance of SCR reactor or before being positioned at each ammonia-spraying grid.
This utility model has the advantages that
High-performance SCR minimum discharge based on subregion mixing regulation described in the utility model controls
System includes SCR inlet flue, SCR exhaust pass, DCS control system and SCR reactor,
By some gas approach dividing plates, SCR inlet flue is divided into some inlet flue gas passages, each entrance
It is provided with ammonia-spraying grid in exhaust gases passes, by exhaust pass dividing plate, SCR exhaust pass is divided into some
Exiting flue gas passage, wherein, a corresponding exiting flue gas passage of inlet flue gas passage, passes through
The concentration of nitrogen oxides in detector detection outlet exhaust gases passes, DCS control system is according to outlet
In exhaust gases passes, the concentration of nitrogen oxides controls to enter into ammonia-spraying grid in corresponding inlet flue gas passage
Ammonia spraying amount, thus realize in SCR inlet flue the uniform of ammonia and NOx in each inlet flue gas passage
Mixing, the most stable guarantee ammonia nitrogen mol ratio distributing homogeneity, improves SCR performance, reduces whole
Body ammonia slip levels, ensures the safety of follow-up equipment.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Wherein, 1 be SCR inlet flue, 2 for regulation valve, 3 for inlet flue gas passage, 4 for spray
Ammonia grid, 5 be new type static mixer, 6 for gas approach dividing plate, 7 for exhaust pass dividing plate,
8 be DCS control system, 9 for SCR reactor, 10 for detector, 11 for SCR outlet cigarette
Road.
Detailed description of the invention
Below in conjunction with the accompanying drawings this utility model is described in further detail:
With reference to Fig. 1, high-performance SCR based on subregion mixing regulation described in the utility model is ultralow
Emission control systems includes SCR inlet flue 1, some gas approach dividing plates 6, some exhaust pass
Dividing plate 7, SCR exhaust pass 11, DCS control system 8, ammonia input channel and SCR reaction
Device 9；The outlet of SCR inlet flue 1 is connected with the entrance of SCR reactor 9, and SCR reacts
The outlet of device 9 is connected with the entrance of SCR exhaust pass 11, wherein, and each gas approach dividing plate
6 outlets being positioned at SCR inlet flue 1, and each gas approach dividing plate 6 is by SCR inlet flue
The outlet of 1 is divided into some inlet flue gas passages 3, each exhaust pass dividing plate 7 to be positioned at SCR outlet cigarette
In the entrance in road 11, and if each exhaust pass dividing plate 7 entrance of SCR exhaust pass 11 is divided into
Do a mouthful exhaust gases passes, wherein, in each inlet flue gas passage 3, be equipped with ammonia-spraying grid 4, ammonia
Input channel entrance with each ammonia-spraying grid 4 respectively is connected, the entrance of the most each ammonia-spraying grid 4
Place is equipped with regulation valve 2, is equipped with for detecting its interior nitrogen oxides in each exiting flue gas passage
The detector 10 of concentration, the outfan of detector 10 is connected with the input of DCS control system 8
Connecing, the outfan of DCS control system 8 is connected with the control end of regulation valve 2, wherein, and one
The corresponding exiting flue gas passage of inlet flue gas passage 3.
It should be noted that described each inlet flue gas passage 3 is sequentially distributed in the width direction, respectively go out
Mouth exhaust gases passes is sequentially distributed the most in the width direction, and the most each inlet flue gas passage 3
Aspect ratio is equal to the aspect ratio of each exiting flue gas passage；The quantity of gas approach dividing plate 6 and outlet cigarette
The quantity of road dividing plate 7 is equal；Detector 10 is CEMS；It is provided with novel in inlet flue gas passage 3
Static mixer 5, wherein static mixer 5 is positioned at entering of ammonia-spraying grid 4 and SCR reactor 9
Between Kou or before being positioned at ammonia-spraying grid.
Specific works process of the present utility model is:
A corresponding regulation valve 2 of inlet flue gas passage 3 and an outlet cigarette in this utility model
Gas passage, the concentration information of the nitrogen oxides in detector 10 detection outlet exhaust gases passes, and by institute
The concentration information stating nitrogen oxides is sent in DCS control system 8, dense when described nitrogen oxides
When degree is more than or less than preset value, then controls correspondence regulation valve 2 and increase or reduce and enter into correspondence and enter
Ammonia spraying amount in ammonia-spraying grid 4 in mouthful exhaust gases passes 3, ammonia by under the effect of static mixer 5,
It is sufficiently mixed, so with the nitrogen oxides in flue gas in subregion flue, although each by stages nitrogen oxygen
Compound and ammonia density have larger difference, but the ammonia nitrogen mol ratio in each subregion is evenly distributed, and ammonia amount
All spray into according to amount actually required in each subregion, after each subregion flue gas enters reactor 9, because of mixed
Close distance shorter, flow flue gas in each subregion and be mutually mixed less just having entered in catalyst duct
Carrying out reduction reaction, in each subregion of reactor outlet flue gas, flue gas should present more uniform, is presetting
Nitrous oxides concentration distribution near value.It is computed, each inlet flue gas passage in this utility model
Within in 3, ammonia nitrogen mol ratio can be mixed into relative standard deviation ＜ 3%, therefore at SCR inlet flue
In the case of the NOx distribution frequently variation of 1 porch or concentration skewness, all can be steady
Fixed guarantee ammonia nitrogen mol ratio distributing homogeneity, improves SCR performance, reduces overall ammonia slip levels,
Ensure the safety of follow-up equipment.
Claims (6)
1. a high-performance SCR minimum discharge control system based on subregion mixing regulation, its feature
Be, including SCR inlet flue (1), some gas approach dividing plates (6), some exhaust pass every
Plate (7), SCR exhaust pass (11), DCS control system (8), ammonia input channel and SCR
Reactor (9)；
The outlet of SCR inlet flue (1) is connected with the entrance of SCR reactor (9), SCR
The outlet of reactor (9) is connected with the entrance of SCR exhaust pass (11), wherein, and each entrance
Buffler (6) is positioned at the outlet of SCR inlet flue (1), and each gas approach dividing plate (6)
The outlet of SCR inlet flue (1) is divided into some inlet flue gas passages (3), each exhaust pass every
Plate (7) is positioned at the entrance of SCR exhaust pass (11), and each exhaust pass dividing plate (7) will
The entrance of SCR exhaust pass (11) is divided into some exiting flue gas passages, and wherein, each inlet flue gas leads to
Be equipped with ammonia-spraying grid (4) in road (3), ammonia input channel respectively with each ammonia-spraying grid (4)
Entrance is connected, and the porch of the most each ammonia-spraying grid (4) is equipped with regulation valve (2), respectively exports
The detector (10) for detecting its interior nitrous oxides concentration, detector it is equipped with in exhaust gases passes
(10) outfan is connected with the input of DCS control system (8), DCS control system (8)
Outfan with regulation valve (2) control end be connected, wherein, an inlet flue gas passage (3)
A corresponding exiting flue gas passage.
High-performance SCR minimum discharge based on subregion mixing regulation the most according to claim 1
Control system, it is characterised in that described each inlet flue gas passage (3) is sequentially distributed in the width direction,
Each exiting flue gas passage is sequentially distributed in the width direction.
High-performance SCR minimum discharge based on subregion mixing regulation the most according to claim 2
Control system, it is characterised in that the aspect ratio of the most each inlet flue gas passage (3) is equal to
The aspect ratio of each exiting flue gas passage.
High-performance SCR minimum discharge based on subregion mixing regulation the most according to claim 1
Control system, it is characterised in that the quantity of gas approach dividing plate (6) and exhaust pass dividing plate (7)
Quantity equal.
High-performance SCR minimum discharge based on subregion mixing regulation the most according to claim 1
Control system, it is characterised in that described detector (10) is CEMS.
High-performance SCR minimum discharge based on subregion mixing regulation the most according to claim 1
Control system, it is characterised in that be provided with static mixer (5) in inlet flue gas passage (3), its
Middle static mixer (5) be positioned between the entrance of ammonia-spraying grid (4) and SCR reactor (9) or
Before being positioned at each ammonia-spraying grid (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620434612.6U CN205627632U (en) | 2016-05-12 | 2016-05-12 | High performance SCR minimum discharge control system based on subregion mixes to be adjusted |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620434612.6U CN205627632U (en) | 2016-05-12 | 2016-05-12 | High performance SCR minimum discharge control system based on subregion mixes to be adjusted |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205627632U true CN205627632U (en) | 2016-10-12 |
Family
ID=57060354
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620434612.6U Active CN205627632U (en) | 2016-05-12 | 2016-05-12 | High performance SCR minimum discharge control system based on subregion mixes to be adjusted |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205627632U (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106000087A (en) * | 2016-05-12 | 2016-10-12 | 西安西热锅炉环保工程有限公司 | High-performance SCR ultra-low emission control system based on subarea mixed adjustment |
| CN106540542A (en) * | 2016-12-12 | 2017-03-29 | 北京工业大学 | A kind of efficient SCR reactors of low dirt |
| CN108371872A (en) * | 2018-04-08 | 2018-08-07 | 中冶长天国际工程有限责任公司 | The desulfuring and denitrifying apparatus of NO_x Reduction by Effective |
| DE102017108443A1 (en) * | 2017-04-20 | 2018-10-25 | Mitsubishi Hitachi Power Systems Europe Gmbh | A method for operating a flue gas catalytically entstickenden flue gas denitration reactor and flue gas denitrification with a suitable for carrying out the method Rauchgasentstickungsreaktor |
| US10287948B1 (en) | 2018-04-23 | 2019-05-14 | Faurecia Emissions Control Technologies, Usa, Llc | High efficiency mixer for vehicle exhaust system |
| US10316721B1 (en) | 2018-04-23 | 2019-06-11 | Faurecia Emissions Control Technologies, Usa, Llc | High efficiency mixer for vehicle exhaust system |
| US10533478B2 (en) | 2017-12-12 | 2020-01-14 | Faurecia Emissions Control Technologies, Usa, Llc | Mixer and valve assembly |
| US10787946B2 (en) | 2018-09-19 | 2020-09-29 | Faurecia Emissions Control Technologies, Usa, Llc | Heated dosing mixer |
| CN112387114A (en) * | 2020-11-20 | 2021-02-23 | 西安热工研究院有限公司 | Device and method for effectively improving SCR denitration efficiency |
| CN114768492A (en) * | 2022-04-28 | 2022-07-22 | 西安西热锅炉环保工程有限公司 | SCR denitration partition system and working method thereof |
-
2016
- 2016-05-12 CN CN201620434612.6U patent/CN205627632U/en active Active
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106000087A (en) * | 2016-05-12 | 2016-10-12 | 西安西热锅炉环保工程有限公司 | High-performance SCR ultra-low emission control system based on subarea mixed adjustment |
| CN106540542A (en) * | 2016-12-12 | 2017-03-29 | 北京工业大学 | A kind of efficient SCR reactors of low dirt |
| DE102017108443A1 (en) * | 2017-04-20 | 2018-10-25 | Mitsubishi Hitachi Power Systems Europe Gmbh | A method for operating a flue gas catalytically entstickenden flue gas denitration reactor and flue gas denitrification with a suitable for carrying out the method Rauchgasentstickungsreaktor |
| US10533478B2 (en) | 2017-12-12 | 2020-01-14 | Faurecia Emissions Control Technologies, Usa, Llc | Mixer and valve assembly |
| CN108371872A (en) * | 2018-04-08 | 2018-08-07 | 中冶长天国际工程有限责任公司 | The desulfuring and denitrifying apparatus of NO_x Reduction by Effective |
| US10287948B1 (en) | 2018-04-23 | 2019-05-14 | Faurecia Emissions Control Technologies, Usa, Llc | High efficiency mixer for vehicle exhaust system |
| US10316721B1 (en) | 2018-04-23 | 2019-06-11 | Faurecia Emissions Control Technologies, Usa, Llc | High efficiency mixer for vehicle exhaust system |
| US10787946B2 (en) | 2018-09-19 | 2020-09-29 | Faurecia Emissions Control Technologies, Usa, Llc | Heated dosing mixer |
| CN112387114A (en) * | 2020-11-20 | 2021-02-23 | 西安热工研究院有限公司 | Device and method for effectively improving SCR denitration efficiency |
| CN114768492A (en) * | 2022-04-28 | 2022-07-22 | 西安西热锅炉环保工程有限公司 | SCR denitration partition system and working method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205627632U (en) | High performance SCR minimum discharge control system based on subregion mixes to be adjusted | |
| CN106000087A (en) | High-performance SCR ultra-low emission control system based on subarea mixed adjustment | |
| CN207996570U (en) | A kind of SCR denitration system | |
| CN106621804A (en) | Fume ammonia injection mixing device and SCR (selective catalytic reduction) fume denitrification system | |
| CN105126616A (en) | SCR denitration system ammonia spraying optimization method based on weight valve regulation and control | |
| CN106984191A (en) | A kind of efficient hybrid system of reducing agent ammonia and its method of work for SCR denitrating flue gas | |
| CN204699575U (en) | The flue gas combined denitrating system of a kind of cement kiln SNCR-SCR | |
| CN112275133A (en) | Denitration control system and method based on coal-fired unit flue gas mixing uniformity adjustment | |
| CN207913518U (en) | The accurate spray ammonia system of the adaptive leveling of full load | |
| CN107670474B (en) | SNCR (selective non-catalytic reduction) denitration system control device and denitration control method | |
| CN107008144B (en) | Device for realizing SCR flue gas denitration multistage ammonia spraying and flue gas denitration method | |
| CN210303177U (en) | SNCR and SCR coupling flue gas denitration device of pulverized coal furnace | |
| CN205386412U (en) | Boiler flue gas denitration system | |
| JP3241650U (en) | Ammonia injection high-precision control system for SCR denitrification section of coal-fired power plant | |
| CN206996271U (en) | A kind of device for realizing the multistage spray ammonia of SCR denitrating flue gas | |
| CN206414978U (en) | A kind of denitrating flue gas reaction system | |
| CN211174364U (en) | Exhaust gas recirculation system for measuring EGR rate | |
| WO2024021943A1 (en) | Ammonia injection optimization method and apparatus based on scr reaction kinetic model, and medium | |
| CN108043224A (en) | A kind of efficient mixing ammonia-gas spraying device for flue gas denitrification system | |
| CN108722184B (en) | Full-load self-adaptive leveling accurate ammonia spraying system | |
| CN108310973A (en) | Automatic ammonia-gas spraying device and coal fired power plant flue gas system | |
| CN217139893U (en) | SCR denitration subregion system | |
| CN214345593U (en) | Denitration control system based on coal-fired unit flue gas mixing uniformity adjusts | |
| CN104689735B (en) | A kind of integral type ammonia injector mixer being applicable to chimney flue type Benitration reactor | |
| CN213790965U (en) | Flue subregion blender |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |