CN106390717A - Denitration flue for SCR and SNCR combined denitration - Google Patents
Denitration flue for SCR and SNCR combined denitration Download PDFInfo
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- CN106390717A CN106390717A CN201611078563.8A CN201611078563A CN106390717A CN 106390717 A CN106390717 A CN 106390717A CN 201611078563 A CN201611078563 A CN 201611078563A CN 106390717 A CN106390717 A CN 106390717A
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- flue
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/76—Gas phase processes, e.g. by using aerosols
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
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- 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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- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
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- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a denitration flue for SCR and SNCR combined denitration, and belongs to the field of boiler smoke denitration. The denitration flue comprises a horizontal flue behind an outlet of an economizer and an ascending flue between the horizontal flue and an SCR denitration reactor, a continuous flue is arranged between the horizontal flue and the ascending flue, the cross section of the continuous flue is divided into a plurality of separated flues through a plurality of separation structures extending along the flue, smoke mixers are arranged at inlets of the separated flues, and denitration reducing agent spraying devices controlled independently are arranged at outlets of the separated flues. According to the denitration flue, the reliability, adjustability and safety of the SCR and SNCR combined denitration system are improved, denitration efficiency is improved, and it is avoided that local ammonia escape exceeds the standard.
Description
Technical field
The invention belongs to the denitration flue knot in denitration of boiler smoke field, more particularly, to SCR and SNCR combined denitration
Structure, realizes denitration minimum discharge especially for W flame boiler.
Background technology
Domestic electrical market is substantially based on coal-burning boiler, strict all the more with national environmental protection policy, for boiler NOx row
The requirement put also more and more higher.In order to reduce the discharge of pollutant, SCR (selective catalytic oxidation reduction reaction) and SNCR (choosing
Selecting property non-catalytic oxidation reduction reaction) etc. denitration technology be used for boiler smoke emission-reducing system.In Practical Project runs, single
Denitration technology cannot meet all the more strict environmental protection index, and therefore SCR+SNCR combined denitration technology obtains on coal-burning boiler
Apply to extensive.
There are a lot of problems in the denitration technology scheme of traditional SCR+SNCR.Boiler in heavy-duty service operating mode because
The restriction of SNCR temperature window, reducing agent spray gun can only be arranged in furnace outlet region, but behind this region wall because space and
Structure limits, technical difficulty does not often arrange greatly spray gun, causes injection coverage rate in flue for the SNCR system reducing agent narrow,
Poor with the mixing of flue gas, denitration efficiency is low；Reducing agent, nitrous oxides concentration deviation effects in the flue gas that SNCR system causes simultaneously
To the smoke inlet condition of downstream SCR, cause SCR system the escaping of ammonia higher, boiler air preheater is because of the exceeded dust stratification of the escaping of ammonia.
Content of the invention
It is an object of the invention to：There is provided coal-burning boiler SCR+SNCR denitration technology new Flue duct design scheme, by
Denitration flue is divided into some bottom flues by economizer exit, first passes through large scale flue gas blender and eliminate each bottom flue SCR
Mouth flue gas flow field, the inhomogeneities of concentration field, then each separates the denitrfying agent spraying system of flue according to actual nitrogen oxides
Concentration is separately adjustable.The program generally enhances reliability, controllability and the security of SCR+SNCR combined denitration system,
Improve denitration efficiency, it is to avoid local the escaping of ammonia is exceeded.
The object of the invention is realized by following technical proposals：
A kind of denitration flue for SCR and SNCR combined denitration, including the horizontal flue after economizer exit, Yi Jishui
Uptake flue to before SCR denitration reactor after flat flue, arranges one section of continuous flue in horizontal flue and uptake flue,
Flue is separated on cross section several by some separation structures along flue extension in this section of continuous flue and separates cigarette
Road, and each porch separating flue is provided with flue gas blender, the exit that each separates flue is provided with each
The denitrification reducing agent injection apparatus of independent control；Flue gas blender is by some groups of blender blade groups along the arrangement of flue section in a row
Composition, every group of blender blade group intersects composition by a pair of blender blade along flue gas direction, and blender blade group direction
The intersecting angle in flue gas direction is 60-90 °, and each blender blade is spliced to form with 60-90 ° of angle by two straight panels.
In this patent, in boiler economizer outlet, using separating flue arrangement, separation structure is from denitration entrance for denitration flue
Until reducing agent injection apparatus export, each separates flue entrance and all arranges large scale flue gas blender flue, improves flue gas
The uniformity of middle nitrogen oxides distribution；Each separates flue reducing agent injection apparatus using independent control it is ensured that actual ammonia nitrogen rubs
That ratio is in design load.After flue gas flows through this large scale flue gas blender, it is possible to achieve flue width and short transverse equal
Even property adjustment, within the concentration of component deviation of traditional no blender scheme is reduced to 10% from 50%.
Alternatively, separating flue section is in approximating square.In the program, to ensure at flue reducing agent injection apparatus
Reducing agent (such as ammonia) uniform fold in flue of injection.Alternatively, each separation cross section in continuous flue for the flue
Upper composition sphere of movements for the elephants shape or " day " font.
Alternatively, it is additionally provided with flue ash bucket below the turning point of horizontal flue and uptake flue.In the program, flue
The dust stratification of sedimentation in ash bucket collecting flue.
Alternatively, blender blade group is 90 ° towards the intersecting angle in flue gas direction, and each blender blade is by two
Straight panel is spliced to form with 90 ° of angles.In the program, can adjust blender blade angle and blade group angle according to actual conditions,
And the length and width of blender blade, realize different mixed effects, preferably two angles are 90 °.
The aforementioned main scheme of the present invention and its each further selection scheme can be this with independent assortment to form multiple schemes
Invention can adopt and claimed scheme；And the present invention, between (each non conflicting selection) selects and and other selections between
Can also independent assortment.Those skilled in the art can understand have according to prior art and common knowledge after understanding the present invention program
Multiple combination, is the claimed technical scheme of the present invention, and here does not do exhaustion.
Beneficial effects of the present invention：Economizer exit denitration flue adopts segregation scheme, separates the big of flue entrance arrangement
Yardstick flue gas mixing arrangement, reduces the reducing agent of SCR inlet flue gas and nitrous oxides concentration deviation in bottom flue, by tradition no
Within the concentration of component deviation of blender scheme reduces to 10% from 50%, simultaneously using the plan separating flue AIG independent control
Slightly, thus ensureing the efficiency being maintained at design load, improve denitrating system of the ammonia nitrogen mol ratio in whole flue cross section, denitration
Efficiency is up to more than 90%.
Brief description
Fig. 1 is the apparatus structure schematic diagram of the embodiment of the present invention；
Fig. 2 is that the matrix pattern of the embodiment of the present invention separates flue structure schematic diagram；
Fig. 3 is that the day font of the embodiment of the present invention separates flue structure schematic diagram；
Fig. 4 is the flue gas mixer structure schematic diagram of the embodiment of the present invention；
Wherein 11- furnace arch, furnace nose spray gun arrangement, 12- flue gas blender, 13-AIG spray ammonia grid, 14-SCR Benitration reactor,
15- blender blade, 21- separates flue, 22- horizontal flue, 23- uptake flue, 24- flue ash bucket.
Specific embodiment
Following non-limiting examples are used for the present invention is described.
W flame boiler flue denitration scheme as shown in Figure 1, using SNCR+SCR combined denitration technology, economizer exit
After there is the uptake flue to before SCR denitration reactor after horizontal flue, and horizontal flue, in horizontal flue with rise cigarette
It is additionally provided with flue ash bucket below the turning point in road.As shown in Figure 1 in boiler economizer outlet, in horizontal flue and uptake flue
Flue is divided in this section of continuous flue on cross section by one section of continuous flue of setting by some separation structures along flue extension
It is divided into several and separates flue, separation structure is from denitration gas approach up to SCR reducing agent injection apparatus (AIG sprays ammonia grid)
Outlet, each separates flue entrance and all arranges large scale flue gas blender 12, improves the uniformity of nitrogen oxides in effluent distribution；
Each separates SCR reducing agent injection apparatus (AIG spray ammonia grid 13) at flue outlet using independent control it is ensured that actual ammonia nitrogen
Mol ratio is in design load.
Flue gas blender 12 structural representation such as Fig. 4, in figure arrow is flue gas direction, and flue gas blender is mixed by some groups
Device blade group in a row forms along the arrangement of flue section, and every group of blender blade group is by a pair of blender blade 15 along flue gas direction
Intersect (and the length direction of two blender blade 15 of blender blade group is parallel with two planes that flue gas direction is formed) to constitute,
And blender blade group towards the intersecting angle α in flue gas direction, (i.e. the length direction of two blender blade 15, towards flue gas side
Angle to side) it is 60-90 °, each blender blade 15 is spliced to form with 60-90 ° of angle β by two straight panels.According to reality
Border situation can adjust blender blade 15 angle and blade group angle, and the length and width of blender blade 15, realizes not
Same mixed effect, controls resistance；After flue gas flows through this large scale flue gas blender, it is possible to achieve flue width and height
The uniformity adjustment in direction；
Separate flue according to the physical dimension of large flue, be separated into square structure as far as possible, a size of 3 × 3 meters about, with
Ensure that flue AIG sprays the ammonia spraying at ammonia grid uniform fold in flue, little separation flue is divided into matrix pattern (by some crosses
Shape separation structure is separated), as shown in Fig. 2 or day font (being separated by some yi word pattern separation structures), as Fig. 3 institute
Show.
As an example, SCR-SNCR technology denitrating system implemented by the W flame boiler of certain 600MW, and SNCR system is using reduction
Agent is liquefied ammonia, is sprayed toward boiler furnace by spray gun, and economizer exit arranges denitration flue and SCR reactor.
Economizer exit denitration flue adopts isolation technique, and each separates the arrangement large scale flue gas mixing of bottom flue entrance
Device, blender blade group is 90 ° towards the intersecting angle in flue gas direction, and each blender blade by two straight panel angle angles is
90 °, the nitrogen oxides of denitration flue entrance and reductant concentration maximum deviation are reduced to by large scale flue gas blender from 50%
10%, improve the flue gas condition of SCR system entrance；Separate flue AIG system and adopt independent control, spray is according to quantity according to each point
Nitrous oxides concentration in flue is adjusted, so that overall denitrating system Effec-tive Function.
This project boiler furnace outlet nitrogen oxides 800mg/m3, exiting flue gas nitrogen oxides reaches 48mg/m3, denitration effect
Rate 94%.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.
Claims (5)
1. a kind of denitration flue for SCR and SNCR combined denitration, including the horizontal flue after economizer exit, and level
Uptake flue to before SCR denitration reactor after flue it is characterised in that：Arrange one section in horizontal flue and uptake flue
Flue is separated into some on cross section by continuous flue by some separation structures along flue extension in this section of continuous flue
Individual separation flue, and each porch separating flue is provided with flue gas blender, the exit that each separates flue is all provided with
It is equipped with the denitrification reducing agent injection apparatus of respective independent control；Flue gas blender is by some groups of blender blade groups along flue section
Arrangement in a row forms, and every group of blender blade group intersects composition by a pair of blender blade along flue gas direction, and blender leaf
Piece group is 60-90 ° towards the intersecting angle in flue gas direction, and each blender blade splices structure by two straight panels with 60-90 ° of angle
Become.
2. be used for as claimed in claim 1 the denitration flue of SCR and SNCR combined denitration it is characterised in that：Separate flue to break
Face is in approximating square.
3. be used for as claimed in claim 1 the denitration flue of SCR and SNCR combined denitration it is characterised in that：Each separation flue
Composition sphere of movements for the elephants shape or " day " font on the cross section in continuous flue.
4. be used for as claimed in claim 1 the denitration flue of SCR and SNCR combined denitration it is characterised in that：In horizontal flue
Be additionally provided with flue ash bucket below the turning point of uptake flue.
5. be used for as claimed in claim 1 the denitration flue of SCR and SNCR combined denitration it is characterised in that：Blender blade
Group is 90 ° towards the intersecting angle in flue gas direction, and each blender blade is spliced to form with 90 ° of angles by two straight panels.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611078563.8A CN106390717B (en) | 2016-11-30 | 2016-11-30 | Denitration flue for combined denitration of SCR and SNCR |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611078563.8A CN106390717B (en) | 2016-11-30 | 2016-11-30 | Denitration flue for combined denitration of SCR and SNCR |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106390717A true CN106390717A (en) | 2017-02-15 |
| CN106390717B CN106390717B (en) | 2023-05-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611078563.8A Active CN106390717B (en) | 2016-11-30 | 2016-11-30 | Denitration flue for combined denitration of SCR and SNCR |
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Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB149676A (en) * | 1919-07-31 | 1921-05-26 | Rodolphe William Burckhardt | A device for effecting rapidly the mixing of gaseous strata flowing in flues or other passages |
| US6146605A (en) * | 1999-07-26 | 2000-11-14 | Hera, Llc | Combined SCR/SNCR process |
| CN101450293A (en) * | 2008-12-22 | 2009-06-10 | 西安热工研究院有限公司 | Fin type blunt body static mixing device |
| CN101987280A (en) * | 2010-11-24 | 2011-03-23 | 中国科学院广州能源研究所 | SCR (silicon controlled rectifier) denitration reactor of coal fuel gas |
| CN201949798U (en) * | 2011-03-01 | 2011-08-31 | 南京龙源环保有限公司 | Flue gas mixing device in front of selective catalytic reduction (SCR) inlet in selective non-catalytic reduction/selective catalytic reduction (SNCR/SCR) combined denitration system |
| CN202146712U (en) * | 2011-06-27 | 2012-02-22 | 南京龙源环保有限公司 | Smoke catalytic reduction denitration device capable of mixing uniformly, equalizing and guiding flow |
| CN102626585A (en) * | 2012-04-16 | 2012-08-08 | 浙江大学 | V-type ammonia spraying and mixing system for SCR (Selective Catalytic Reduction) smoke denitrification device |
| CN103657411A (en) * | 2013-12-13 | 2014-03-26 | 哈尔滨锅炉厂有限责任公司 | Vortex mixing device for SCR (silicon controlled rectification) flue gas denitration system |
| CN104190252A (en) * | 2014-08-20 | 2014-12-10 | 浙江大学 | Multistage pyrolysis coupled flue gas denitrification system with independent SCR (Selective Catalytic Reduction) ammonia-supplementing spray guns |
| CN104226110A (en) * | 2014-10-09 | 2014-12-24 | 河南合众电力技术有限公司 | Coal-fired boiler SCR (Selective Catalytic Reduction) denitration control method and system |
| CN105169917A (en) * | 2015-09-26 | 2015-12-23 | 国网河南省电力公司电力科学研究院 | SNCR-SCR combined denitration system and method based on ammonia nitrogen molar ratio detection and regulation |
-
2016
- 2016-11-30 CN CN201611078563.8A patent/CN106390717B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB149676A (en) * | 1919-07-31 | 1921-05-26 | Rodolphe William Burckhardt | A device for effecting rapidly the mixing of gaseous strata flowing in flues or other passages |
| US6146605A (en) * | 1999-07-26 | 2000-11-14 | Hera, Llc | Combined SCR/SNCR process |
| CN101450293A (en) * | 2008-12-22 | 2009-06-10 | 西安热工研究院有限公司 | Fin type blunt body static mixing device |
| CN101987280A (en) * | 2010-11-24 | 2011-03-23 | 中国科学院广州能源研究所 | SCR (silicon controlled rectifier) denitration reactor of coal fuel gas |
| CN201949798U (en) * | 2011-03-01 | 2011-08-31 | 南京龙源环保有限公司 | Flue gas mixing device in front of selective catalytic reduction (SCR) inlet in selective non-catalytic reduction/selective catalytic reduction (SNCR/SCR) combined denitration system |
| CN202146712U (en) * | 2011-06-27 | 2012-02-22 | 南京龙源环保有限公司 | Smoke catalytic reduction denitration device capable of mixing uniformly, equalizing and guiding flow |
| CN102626585A (en) * | 2012-04-16 | 2012-08-08 | 浙江大学 | V-type ammonia spraying and mixing system for SCR (Selective Catalytic Reduction) smoke denitrification device |
| CN103657411A (en) * | 2013-12-13 | 2014-03-26 | 哈尔滨锅炉厂有限责任公司 | Vortex mixing device for SCR (silicon controlled rectification) flue gas denitration system |
| CN104190252A (en) * | 2014-08-20 | 2014-12-10 | 浙江大学 | Multistage pyrolysis coupled flue gas denitrification system with independent SCR (Selective Catalytic Reduction) ammonia-supplementing spray guns |
| CN104226110A (en) * | 2014-10-09 | 2014-12-24 | 河南合众电力技术有限公司 | Coal-fired boiler SCR (Selective Catalytic Reduction) denitration control method and system |
| CN105169917A (en) * | 2015-09-26 | 2015-12-23 | 国网河南省电力公司电力科学研究院 | SNCR-SCR combined denitration system and method based on ammonia nitrogen molar ratio detection and regulation |
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| CN106390717B (en) | 2023-05-23 |
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