CN108786458A - A kind of SCR denitration is anti-blocking to put forward effect system - Google Patents
A kind of SCR denitration is anti-blocking to put forward effect system Download PDFInfo
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- CN108786458A CN108786458A CN201810751802.4A CN201810751802A CN108786458A CN 108786458 A CN108786458 A CN 108786458A CN 201810751802 A CN201810751802 A CN 201810751802A CN 108786458 A CN108786458 A CN 108786458A
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- scr denitration
- ammonia
- flue
- blocking
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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
- B01D53/8631—Processes characterised by a specific device
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/02—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising gravity
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/04—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia
- B01D45/08—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia by impingement against baffle separators
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chimneys And Flues (AREA)
- Treating Waste Gases (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
Effect system is put forward the present invention relates to a kind of SCR denitration is anti-blocking, it include the gas approach set gradually by flow of flue gas direction, SCR denitration reactor and exhaust pass, the gas approach is connect with economizer exit channel, the exhaust pass is connect with air preheater access road, the gas approach includes primary dedusting section and final dusting section, wherein, the entrance ash bucket for connecting the economizer exit channel is equipped in the primary dedusting section, the final dusting section is that bottom end connects the entrance ash bucket and along the acclivitous inclination flue in flow of flue gas direction, in the inclination flue airflow-distribution board and ammonia-spraying grid are disposed with according to flow of flue gas direction, outlet ash bucket is provided in the exhaust pass.Compared with prior art, The present invention reduces the stifled ashes of SCR denitration system, and increase ammonia nitrogen mixability, mitigate the dust stratification of SCR denitration layer and the problem that air preheater pressure difference is high significantly, ensure the energy-efficient operation of SCR denitration system.
Description
Technical field
The present invention relates to a kind of SCR denitration systems, and effect system is put forward more particularly, to a kind of SCR denitration is anti-blocking.
Background technology
Selective catalytic reduction (Selective Catalytic Reduction, SCR) is that coal-fired power station boiler is universal
A kind of efficient NOx control technologies used, and mostly use high dirt arrangement greatly, i.e. SCR is located at economizer and air preheater (referred to as
Air preheater) between.Due to being chronically at high dirt environment, catalyst easily blocks, wears and is poisoned.In addition, the dust in flue gas
Also the spray ammonia mouth of ammonia-spraying grid is easily blocked so that the flow velocity inhomogeneities of ammonia rises, and ammonia nitrogen ratio is not on catalyst inlet interface
Uniformity increases, to seriously affect the denitration effect of catalyst.NH3- NOx mixes degree of irregularity often with run time
Passage it is further serious, subregion NH3Concentration of escaping is much larger than 3ppm, and environmental protection index is not achieved in local NO x concentration of emissions
It is required that power plant often maintains low NOx emission concentration using ammonia spraying amount is increased, this undoubtedly increases ammonia consumption, while also leading
Hydrogen sulfate ammonia (ABS) generation probability is caused to greatly increase.The ABS one side blocking catalysts duct of generation reduces catalyst activity；
Another party's Surface ABS condenses into emplastic in the case where flue-gas temperature is less than 230 DEG C, with flying dust mixed deposit in back-end ductwork
Air preheater heat accumulating element on, reduce actual internal area in air preheater so that air preheater pressure difference increase, heat exchange efficiency reduce,
The stability of unit operation reduces.
The method for reducing ammonia-spraying grid spray ammonia unevenness at present is that the spray ammonia of progress ammonia-spraying grid optimizes and revises experiment, that is, is adjusted
Whole ammonia-spraying grid respectively sprays the ammonia spraying amount of ammonia branch pipe so that NH in the flue gas of denitrating system entrance3Concentration distribution and NOx concentration phase
Match, utmostly improves uniformly distributed degree, reduce NH3Concentration of escaping and NOx emission concentration.But it with the variation of boiler load and sets
The adjustment of standby operating status, at catalyst ammonia nitrogen than distribution gradually become uneven cloth state, NH again3Escape amount increases again,
NH can not fundamentally be solved3Escape problem.
In order to clean the dust stratification of SCR denitration system in engineering, it would be desirable to arrange more soot blowers, more frequently be blown
Ash, cause system come into operation cost increase.
Invention content
It is carried it is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of SCR denitration is anti-blocking
Effect system.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of SCR denitration is anti-blocking to put forward effect system, includes the gas approach set gradually by flow of flue gas direction, SCR denitration
Reactor and exhaust pass, the gas approach are connect with economizer exit channel, and the exhaust pass is logical with air preheater entrance
Road connects, and the gas approach includes primary dedusting section and final dusting section, wherein connection institute is equipped in the primary dedusting section
The entrance ash bucket in economizer exit channel is stated, the final dusting section is that bottom end connects the entrance ash bucket and along flow of flue gas side
To acclivitous inclination flue, airflow-distribution board and spray ammonia are disposed with according to flow of flue gas direction in the inclination flue
Grid.
Further, the airflow-distribution board be disposed vertically in tilt flue in, the folder of airflow-distribution board and vertical direction
Angle and inclination flue are identical as the angle of horizontal direction.
Further, the ammonia-spraying grid be disposed vertically in tilt flue in, it is parallel with airflow-distribution board.
Further, the ammonia-spraying grid is made of multigroup for ammonia pipeline, described to be evenly arranged in inclination cigarette for ammonia pipeline
On the section in road.
Further, described for being evenly arranged multiple nozzles on ammonia pipeline.
Further, the spray angle of the nozzle and the angle in flow of flue gas direction are not more than 90 degree.It is furthermore preferred that spray
In mouth there are two spray angle also in non-vertical position, and then it is possible to prevente effectively from secondary landing dust plug nozzle.
Further, SCR denitration layer is housed, on the SCR denitration layer in the SCR denitration reactor
Side, which is equipped with, makes ammonia nitrogen than being distributed uniform flow straightening grid.
Further, it is provided with outlet ash bucket in the exhaust pass.
The flue gas for carrying a large amount of soot particles enters the ash disposal of realization of entrance ash bucket from economizer exhaust pass, inclines into denitration
In oblique flue, after encountering airflow-distribution board, since the quality and inertia of soot particle are larger, change it after striking airflow-distribution board
The direction of motion makes it fall on obliquely in entrance ash bucket and realizes secondary ash disposal, and a large amount of ash is prevented to enter SCR reactors,
More clean flue gas flow velocity after airflow-distribution board becomes uniform, continue up flowing pass through ammonia-spraying grid, ammonia-spraying grid by
In slant setting, substantially reduces a small amount of flying dust carried in flue gas and fall into the possibility that nozzle results in blockage, and multi-angle nozzle
Make NH3It is sprayed from three kinds of angles, area coverage is big, improves NH3The uniformity mixed with NOx in flue gas.NH3It is very low with dust-laden
Flue gas mixing after eliminated after guide vane and flow straightening grid at reducing formed flow field problem of non-uniform so that enter
First floor catalyst ammonia nitrogen score cloth becomes uniform, can get comparatively ideal denitration effect, and control NH3Escape.By denitration
Denitration flue gas after catalyst layer enters after realizing ash disposal three times using outlet ash bucket in air preheater.
Compared with prior art, the invention has the advantages that：
1, flue gas is in entrance ash bucket after primary dedusting, and into when tilting flue, ash particle will overcome the effect of gravity
Reduce the soot particle for reaching and tilting flue；
2, the setting of airflow-distribution board may be implemented final dusting and flow；
3, tilted-putted ammonia-spraying grid reduces the stifled ash of nozzle, and increases ammonia nitrogen mixability, mitigates SCR significantly
The dust stratification problem of denitration catalyst oxidant layer ensures the energy-efficient operation of SCR denitration system；
4, multi-angle nozzle makes NH3It is sprayed from multiple angles, area coverage is big, improves NH3It is mixed with NOx in flue gas
Uniformity.
Description of the drawings
Fig. 1 is a kind of anti-blocking schematic diagram for putting forward effect system of SCR denitration of the present invention；
Fig. 2 is the schematic diagram of conventional scr denitrating system；
Fig. 3 is the nozzle schematic diagram of the ammonia-spraying grid in the present invention；
Fig. 4 is the nozzle schematic diagram of conventional ammonia-spraying grid.
Shown in figure label：
1, entrance ash bucket, 2, tilt flue, 3, airflow-distribution board, 4, ammonia-spraying grid, 5, guide vane, 6, flow straightening grid,
7, SCR denitration layer, 8, outlet ash bucket, 9, nozzle, 10, for ammonia pipeline, 11, air preheater, 12, economizer.
Specific implementation mode
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment
Existing SCR denitration system as shown in Fig. 2, ammonia-spraying grid 4 is arranged horizontally in conventional scr denitrating system, due to
Flue arranges that the spray of ammonia-spraying grid 4 ammonia direction is identical as flow of flue gas direction vertically, and with reference to figure 4, general nozzle uses single spraying
Mouth, and arrange vertically upward, a large amount of flying dusts carried in flue gas are since gravity can fall into nozzle, to block jet pipe, sternly
The uniformity coefficient of ammonia nitrogen is affected again.The flue gas stream for separately carrying a large amount of flying dusts passes through SCR denitration layer 7 from top to bottom
When, flying dust promote under the effect of gravity SCR denitration layer 7 into ash and dust stratification.
The present embodiment proposes that a kind of SCR denitration is anti-blocking to put forward effect system, includes entering by what flow of flue gas direction was set gradually
Mouth flue, SCR denitration reactor and exhaust pass, gas approach are connect with economizer 12, and exhaust pass is connect with air preheater 11,
Gas approach includes primary dedusting section and final dusting section, wherein connection 12 exit passageway of economizer is equipped in primary dedusting section
Entrance ash bucket 1, final dusting section is that bottom end connects entrance ash bucket 1 and along the acclivitous inclination flue 2 in flow of flue gas direction,
It tilts in flue 2 and is disposed with airflow-distribution board 3 and ammonia-spraying grid 4 according to flow of flue gas direction.Airflow-distribution board 3 is vertically put
It is placed in and tilts in flue 2.Ammonia-spraying grid 4 be disposed vertically in tilt flue 2 in, it is parallel with airflow-distribution board 3.Ammonia-spraying grid 4 by
It is multigroup to be formed for ammonia pipeline 10, it is evenly arranged on the section for tilting flue 2 for ammonia pipeline 10, for being evenly arranged on ammonia pipeline 10
There are multiple nozzles 9, spray angle and the angle in flow of flue gas direction to be not more than 90 degree.SCR denitration is housed in SCR denitration reactor
Catalyst layer 7,7 top of SCR denitration layer, which is equipped with, makes ammonia nitrogen than being distributed uniform flow straightening grid 6.Setting in exhaust pass
There is outlet ash bucket 8.
It is once removed as shown in Figure 1, carrying the flue gases of a large amount of soot particles and from 12 exhaust pass of economizer entering entrance ash bucket 1 and realize
Ash tilts in flue 2 into denitration, after encountering airflow-distribution board 3, since the quality and inertia of soot particle are larger, is striking gas
Change its direction of motion after flow point fabric swatch 3, so that it is fallen on obliquely in entrance ash bucket 1 and realize secondary ash disposal, prevents a large amount of
Ash enter SCR reactors, more clean flue gas flow velocity after airflow-distribution board 3 becomes uniform, continue up flowing pass through
Ammonia-spraying grid 4, ammonia-spraying grid 4 are substantially reduced a small amount of flying dust carried in flue gas and fall into nozzle 9 and resulted in blockage due to slant setting
Possibility, as shown in figure 3, multi-angle nozzle 9 makes NH3It is sprayed from three kinds of angles, area coverage is big, improves NH3In flue gas
The uniformity of NOx mixing.NH3After the flue gas mixing very low with dust-laden reducing is eliminated after guide vane 5 and flow straightening grid 6
Locate the flow field problem of non-uniform formed so that become uniform into first floor catalyst ammonia nitrogen score cloth, can get comparatively ideal de-
Nitre effect, and control NH3Escape.Denitration flue gas after SCR denitration layer 7 realizes three using outlet ash bucket 8
Enter in air preheater 11 after secondary ash disposal.
The above description of the embodiments is intended to facilitate ordinary skill in the art to understand and use the invention.
Person skilled in the art obviously easily can make various modifications to these embodiments, and described herein general
Principle is applied in other embodiment without having to go through creative labor.Therefore, the present invention is not limited to the above embodiments, ability
Field technique personnel announcement according to the present invention, improvement and modification made without departing from the scope of the present invention all should be the present invention's
Within protection domain.
Claims (8)
- Include that the gas approach set gradually by flow of flue gas direction, SCR denitration are anti-1. a kind of SCR denitration is anti-blocking to put forward effect system Device and exhaust pass, the arrival end of the gas approach is answered also to be connect with economizer (12) exit passageway, the exhaust pass Outlet end is also connect with air preheater (11) access road, which is characterized in that the gas approach includes sequentially connected once removing Dirt section and final dusting section, wherein the entrance ash for connecting economizer (12) exit passageway is equipped in the primary dedusting section It struggles against (1), the final dusting section is that bottom end connects the entrance ash bucket (1) and along the acclivitous inclination cigarette in flow of flue gas direction Road (2), the inclination flue (2) is interior to be disposed with airflow-distribution board (3) and ammonia-spraying grid (4) according to flow of flue gas direction.
- 2. a kind of SCR denitration according to claim 1 is anti-blocking to put forward effect system, which is characterized in that the airflow-distribution board (3) It is disposed vertically interior in tilting flue (2).
- 3. a kind of SCR denitration according to claim 1 is anti-blocking to put forward effect system, which is characterized in that the ammonia-spraying grid (4) is hung down Straight be positioned over tilts in flue (2), parallel with airflow-distribution board (3).
- 4. a kind of SCR denitration according to claim 1 is anti-blocking to put forward effect system, which is characterized in that the ammonia-spraying grid (4) by It is multigroup to be formed for ammonia pipeline (10), it is described to be evenly arranged on the section for tilting flue (2) for ammonia pipeline (10).
- 5. a kind of SCR denitration according to claim 4 is anti-blocking to put forward effect system, which is characterized in that described for ammonia pipeline (10) On be evenly arranged multiple nozzles (9).
- 6. a kind of SCR denitration according to claim 5 is anti-blocking to put forward effect system, which is characterized in that the injection of the nozzle (9) Angle and the angle in flow of flue gas direction are not more than 90 degree.
- 7. a kind of SCR denitration according to claim 1 is anti-blocking to put forward effect system, which is characterized in that the SCR denitration reactor Interior that SCR denitration layer (7) is housed, being equipped with above the SCR denitration layer (7) makes ammonia nitrogen than being distributed uniform rectification Grid (6).
- 8. a kind of SCR denitration according to claim 1 is anti-blocking to put forward effect system, which is characterized in that set in the exhaust pass It is equipped with outlet ash bucket (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810751802.4A CN108786458A (en) | 2018-07-10 | 2018-07-10 | A kind of SCR denitration is anti-blocking to put forward effect system |
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| CN201810751802.4A CN108786458A (en) | 2018-07-10 | 2018-07-10 | A kind of SCR denitration is anti-blocking to put forward effect system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109954404A (en) * | 2019-04-24 | 2019-07-02 | 福建龙净环保股份有限公司 | SCR denitration system |
| CN110052165A (en) * | 2019-05-29 | 2019-07-26 | 西安热工研究院有限公司 | A kind of device preventing SCR denitration abrasion blocking |
| CN110124514A (en) * | 2019-06-04 | 2019-08-16 | 上海众仕环境科技股份有限公司 | A kind of dedicated upstream injection formula ammonia-spraying grid of Novel anti-blockage SCR denitration |
| CN115006986A (en) * | 2022-06-15 | 2022-09-06 | 深圳市凯盛科技工程有限公司 | Ammonia supply system for flue gas treatment |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109954404A (en) * | 2019-04-24 | 2019-07-02 | 福建龙净环保股份有限公司 | SCR denitration system |
| CN110052165A (en) * | 2019-05-29 | 2019-07-26 | 西安热工研究院有限公司 | A kind of device preventing SCR denitration abrasion blocking |
| CN110124514A (en) * | 2019-06-04 | 2019-08-16 | 上海众仕环境科技股份有限公司 | A kind of dedicated upstream injection formula ammonia-spraying grid of Novel anti-blockage SCR denitration |
| CN115006986A (en) * | 2022-06-15 | 2022-09-06 | 深圳市凯盛科技工程有限公司 | Ammonia supply system for flue gas treatment |
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