CN106731789A - A kind of efficient SCR denitration reactor - Google Patents
A kind of efficient SCR denitration reactor Download PDFInfo
- Publication number
- CN106731789A CN106731789A CN201611101052.3A CN201611101052A CN106731789A CN 106731789 A CN106731789 A CN 106731789A CN 201611101052 A CN201611101052 A CN 201611101052A CN 106731789 A CN106731789 A CN 106731789A
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- Prior art keywords
- reactor
- horizontal
- rectifier
- flue
- waist
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- 241000826860 Trapezium Species 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 description 10
- 239000003054 catalyst Substances 0.000 description 8
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 238000011144 upstream manufacturing Methods 0.000 description 4
- 230000001419 dependent effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 208000035874 Excoriation Diseases 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
A kind of efficient SCR denitration reactor, it is characterised in that：Reactor head uses ramp-roof structure, i.e. reactor top board from the horizontal by an included angle A, and the scope of A is 9 °~20 °；Rectifier uses incline structure, i.e. its front view is right-angled trapezium, and right-angled trapezium a waist and horizontal direction parallel, from the horizontal by an included angle B, the scope of B is 0.5 °~3 ° to another waist；And with the waist of horizontal direction parallel in the lower section of another waist；The above-mentioned design of reactor and rectifier causes to be overlapped with reactor with horizontal flue tie point into the summit at bottom on passage, and rectifier is gradually included with the passage before horizontal flue.This reactor by flue or reactor head set up deflector without meeting flow field technical requirement (CV values are less than 15%).
Description
Technical field
The present invention relates to a kind of SCR denitration inside reactor structure, more particularly, to a kind of SCR denitration reactor head knot
Structure and rectifier structure.
Background technology
SCR is a kind of efficient gas denitrifying technology, is widely used in boiler, stove and other a large amount of nitrogen oxides of generation
Industrial plants denitration administer.The denitration efficiency of SCR technology is influenceed by factors, and wherein Flow Field Distribution is most important skill
One of art index.The examination face of Flow Field Distribution uniformity is on the cross section at ground floor catalyst surface upstream 0.5m, it is desirable to
The definition of maximum deviation coefficient (CV)≤15%, CV of the velocity of flue gas distribution of the section part is：
Wherein：
Average value
Vi：Sampled value
N：Sampling number
SCR inside reactor flue gas flow rates are higher, and influenceed by dust content, and to avoid the deposition of dust, flue gas is usual
From vertical flue vertically upward, reactor head region, then flow down are then entered by horizontal flue, sequentially passes through rectification
Device and catalyst, finally discharge from reactor outlet.That is the flue gas of high speed is needed by the steering of at least 180 degree,
Ground floor catalyst can be reached.Conventional reactor schematic diagram is shown in Fig. 1 and Fig. 2, in the case where deflector is not provided with, its top
The Flow Field Distribution in region is very uneven, and as shown in Figure 5 and Figure 6, its CV value is imitated generally more than 30% so as to have impact on denitration
Rate.Therefore, generally conventional reactor head (rectifier is with upper bit) needs to install substantial amounts of deflector additional to improve flow field, makes
Meet technical requirement.
The design and optimization process of deflector are complicated, if design is improper, the flow field index of reactor can not meet requirement,
But also very big abrasion risk can be brought.The design and Optimization Work of deflector generally need the long period, usually as shadow
Ring one of key factor of project progress.In addition, whether accurate the machining accuracy of deflector, install, final stream can be all influenceed
Field distribution.Current China needs that the industry for carrying out denitration improvement is numerous, and denitration engineering quantity is huge, therefore, research and develop a kind of structure
Simply, it is easy to process, the good SCR reactors of Flow Field Distribution performance seem particularly urgent.
The content of the invention
The purpose of the present invention is exactly to solve the above problems, there is provided a kind of simple structure, easy to process, and Flow Field Distribution is good
SCR reactors, schematic diagram is shown in Fig. 3.Using advanced CFD software star-ccm+, and physics model measurement is combined, the present invention is right
Internal structure to traditional reactor has re-started design.
A kind of efficient SCR denitration reactor, it is characterised in that：Reactor head uses ramp-roof structure, i.e. reactor top board
From the horizontal by an included angle A, the scope of A is 9 °~20 °；
Rectifier uses incline structure, i.e., its front view be right-angled trapezium, and right-angled trapezium a waist and horizontal direction
Parallel, from the horizontal by an included angle B, the scope of B is 0.5 °~3 ° to another waist；
And with the waist of horizontal direction parallel in the lower section of another waist；
The above-mentioned design of reactor and rectifier is caused with the passage before horizontal flue into gradually including on passage, and rectifier
The summit at bottom overlaps with reactor with horizontal flue tie point.
As shown in figure 3, the line segment between summit 1 and 4 constitutes upper bottom, the line segment between summit 2 and 3 constitutes bottom, summit 3
The waist constituted with the line segment between 4 is from the horizontal by an angle.And rectifier summit 4 and reactor and horizontal flue tie point
7 overlap.
Further, and reactor head ramp-roof structure and horizontal flue tie point 7 on same vertical curve.
Further, rectifier bottom summit up and reactor on following summit on same vertical curve, two
Height i.e. H7 between person are the setting height(from bottom) for retaining, and are controlled within 30mm.
CFD software numerical simulation is mainly used with drag：
(1) gas phase turbulance model
A) continuity equation：
B) equation of momentum of X-direction：
C) equation of momentum in Y-direction：
D) equation of momentum in Z-direction：
E) K equations：
F) ε equations：
Wherein, coefficient of eddy viscosityP is Fluid pressure；ρ is gas density；Turbulent flow produces item GkFor：
The above differential equation, can be write as following common version：
Wherein, φ is dependent variable, ΓφIt is the diffusion coefficient of dependent variable φ, SφFor corresponding in dependent variable conservation equation
Source item.
Being expressed as unified transport equation form is：
Items are from left to right followed successively by convective term, diffusion term and source item in formula.
(2) porous media model
For the catalyst layer pressure drop in SCR reactors, it is simulated by regarding catalyst layer as porous media.Its pressure
Drop loss simulation formula is as follows：
Momentum source term, Pa/m on Si-i directions in formula；μ-mobilization dynamic viscosity, Pas；α-medium permeability；vi—
I is to velocity component, m/s；ρ-density, kg/m3；C2- internal drag the factor, 1/m.
The setting of physical model is defined using the nondimensionalization of characteristic of fluid amount, wherein having Reynolds number, Euler's numbers, Bath
Number, Fourier number and model geometric ratio value.
After redesign, main contents of the invention include：(1) reactor head of the invention uses ramp-roof structure (i.e.
Reactor top board is from the horizontal by an included angle A)；(2) rectifier of the invention use incline structure (its front view be right angle ladder
Shape, the line segment between summit 1 and 4 constitutes upper bottom, and the line segment between summit 2 and 3 constitutes bottom, the line segment structure between summit 3 and 4
Into waist from the horizontal by an angle)；(3) ad-hoc location in reactor of rectifier of the invention.
The achievable following functions of the present invention：
Without meeting flow field technical requirement by flue or reactor head set up deflector, (CV values are less than
15%) Fig. 7 and Fig. 8, is seen.Setting deflector in flue can further reduce the CV values in flow field, see Fig. 8 and Fig. 9.
Brief description of the drawings
Fig. 1 is the structural representation of traditional SCR reactors and flow straightening grid.
Fig. 2 is the structural representation of another traditional SCR reactors and flow straightening grid.
Fig. 3 is the structural representation of SCR reactors of the invention
Fig. 4 is the structural representation of SCR reactors of the invention and flow straightening grid
Fig. 5 is traditional SCR inside reactors entirety velocity profile (setting flue deflector)
Fig. 6 is traditional SCR reactor catalysts upstream flow rate distribution map (setting flue deflector)
Fig. 7 is SCR inside reactors entirety velocity profile (being not provided with flue deflector) of the invention
Fig. 8 is SCR reactor catalysts upstream flow rate distribution map (being not provided with flue deflector) of the invention
Fig. 9 is SCR inside reactors entirety velocity profile (setting flue deflector) of the invention
Figure 10 is SCR reactor catalysts upstream flow rate distribution map of the invention (setting flue deflector)
Specific embodiment
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings.
Specific embodiments of the present invention are as follows：
(1) rectifier parameter
H1 scopes：300mm~600mm
H2 scopes：100mm~150mm
H5 scopes：100mm~400mm
H6 scopes：75~150mm
The sum of products section gas flow rate of exhaust gas volumn=cross-sectional area i.e. H3, H4, H3 is generally less than H4, is SCR anti-
Answer the work of device basic engineering personnel.
(2) reactor parameter
Reactor cross-section gas flow rate should be controlled in below 6m/s.
Reactor top board is 9 °~20 ° with the included angle A scope of horizontal direction.
Treatment tolerance is not limited.
(3) rectifier and reactor location relation
Rectifier summit 4 overlaps with reactor with horizontal flue tie point 7.
Rectifier uses incline structure, i.e., its front view be right-angled trapezium, and right-angled trapezium a waist and horizontal direction
Parallel, from the horizontal by an included angle B, the scope of B is 0.5 °~3 ° to another waist；
Between rectifier summit 3 and reactor summit 5, that is, H7 is the setting height(from bottom) for retaining, and is controlled within 30mm.
By adjusting H1, H2, H5, H6, you can meet SCR reactors flow field index request.Such as need further to reduce flow field
CV, can be realized by setting up flue deflector.
Exhaust gas volumn is 130,000 Nm3/ h, cross-sectional gas flow velocity is 3.5m/s, and H1 is 150mm, and H2 is 300mm, and H5 is
When 100mm, H6 are 100mm, when being not provided with flue deflector, CV is 14.2%, and when setting flue deflector, CV is 11.2%.
Exhaust gas volumn is 1,500,000 Nm3/ h, cross-sectional gas flow velocity is 2.5m/s, and H1 is 100mm, and H2 is 450mm, and H5 is
When 100mm, H6 are 185mm, flue deflector is not provided with, CV is 14.6%, when setting flue deflector, CV is 12.4%.
Claims (3)
1. a kind of efficient SCR denitration reactor, it is characterised in that：Reactor head use ramp-roof structure, i.e. reactor top board with
Horizontal direction has angle A, and the scope of A is 9 °~20 °；
Rectifier uses incline structure, i.e., its front view be right-angled trapezium, and right-angled trapezium a waist and horizontal direction parallel,
From the horizontal by an included angle B, the scope of B is 0.5 °~3 ° to another waist；And with the waist of horizontal direction parallel in another waist
Lower section；
The above-mentioned design of reactor and rectifier is caused with the passage before horizontal flue into gradually including bottom on passage, and rectifier
Summit overlaps with reactor with horizontal flue tie point.
2. a kind of efficient SCR denitration reactor according to claim 1, it is characterised in that：
And the ramp-roof structure of reactor head and horizontal flue tie point are on same vertical curve.
3. a kind of efficient SCR denitration reactor according to claim 1, it is characterised in that：
Rectifier bottom summit up and reactor on following summit on same vertical curve, height between the two
Control is within 30mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611101052.3A CN106731789A (en) | 2016-12-05 | 2016-12-05 | A kind of efficient SCR denitration reactor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611101052.3A CN106731789A (en) | 2016-12-05 | 2016-12-05 | A kind of efficient SCR denitration reactor |
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| Publication Number | Publication Date |
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| CN106731789A true CN106731789A (en) | 2017-05-31 |
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ID=58883110
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112237841A (en) * | 2020-11-16 | 2021-01-19 | 华润电力(唐山曹妃甸)有限公司 | SCR reactor and nitrogen oxide removal system |
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|---|---|---|---|---|
| JP2002361074A (en) * | 2001-06-12 | 2002-12-17 | Babcock Hitachi Kk | Reactor for exhaust gas denitration apparatus |
| US20110194986A1 (en) * | 2010-02-11 | 2011-08-11 | Electric Power Research Institute, Inc. | Selective catalytic reduction (scr) reactor assembly to remove fine particles from poisoning or interfering with scr catalyst activity in biomass fuel applications |
| CN202844884U (en) * | 2012-06-01 | 2013-04-03 | 北京国电龙源环保工程有限公司 | Ammonia spraying and eddy-mixing device of flue gas denitrification system |
| CN204034566U (en) * | 2014-07-31 | 2014-12-24 | 山东神华山大能源环境有限公司 | A kind of SCR denitration gas approach |
| CN105561784A (en) * | 2016-02-26 | 2016-05-11 | 北京峰业电力环保工程有限公司 | Rectifying grille device for denitration technology |
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| CN205650080U (en) * | 2016-05-06 | 2016-10-19 | 大唐环境产业集团股份有限公司 | SCR reactor upper portion guiding device in flue of cutting sth. askew |
| CN106110887A (en) * | 2016-08-25 | 2016-11-16 | 东方电气集团东方锅炉股份有限公司 | The accumulatingdust disturbing flow device with contour double-deck fairing for SCR denitration |
| CN205683835U (en) * | 2016-04-22 | 2016-11-16 | 湖北强达环保科技股份有限公司 | A kind of SCR denitration reactor |
| CN206325397U (en) * | 2016-12-05 | 2017-07-14 | 北京工业大学 | A kind of efficient SCR denitration reactor |
-
2016
- 2016-12-05 CN CN201611101052.3A patent/CN106731789A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002361074A (en) * | 2001-06-12 | 2002-12-17 | Babcock Hitachi Kk | Reactor for exhaust gas denitration apparatus |
| US20110194986A1 (en) * | 2010-02-11 | 2011-08-11 | Electric Power Research Institute, Inc. | Selective catalytic reduction (scr) reactor assembly to remove fine particles from poisoning or interfering with scr catalyst activity in biomass fuel applications |
| CN202844884U (en) * | 2012-06-01 | 2013-04-03 | 北京国电龙源环保工程有限公司 | Ammonia spraying and eddy-mixing device of flue gas denitrification system |
| CN204034566U (en) * | 2014-07-31 | 2014-12-24 | 山东神华山大能源环境有限公司 | A kind of SCR denitration gas approach |
| CN105561784A (en) * | 2016-02-26 | 2016-05-11 | 北京峰业电力环保工程有限公司 | Rectifying grille device for denitration technology |
| CN205435480U (en) * | 2016-02-26 | 2016-08-10 | 北京峰业电力环保工程有限公司 | A rectification grille installation for denitration technique |
| CN205683835U (en) * | 2016-04-22 | 2016-11-16 | 湖北强达环保科技股份有限公司 | A kind of SCR denitration reactor |
| CN205650080U (en) * | 2016-05-06 | 2016-10-19 | 大唐环境产业集团股份有限公司 | SCR reactor upper portion guiding device in flue of cutting sth. askew |
| CN106110887A (en) * | 2016-08-25 | 2016-11-16 | 东方电气集团东方锅炉股份有限公司 | The accumulatingdust disturbing flow device with contour double-deck fairing for SCR denitration |
| CN206325397U (en) * | 2016-12-05 | 2017-07-14 | 北京工业大学 | A kind of efficient SCR denitration reactor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112237841A (en) * | 2020-11-16 | 2021-01-19 | 华润电力(唐山曹妃甸)有限公司 | SCR reactor and nitrogen oxide removal system |
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