CN106139946A - A kind of denitration ammonia air mixing device - Google Patents
A kind of denitration ammonia air mixing device Download PDFInfo
- Publication number
- CN106139946A CN106139946A CN201610652723.9A CN201610652723A CN106139946A CN 106139946 A CN106139946 A CN 106139946A CN 201610652723 A CN201610652723 A CN 201610652723A CN 106139946 A CN106139946 A CN 106139946A
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- China
- Prior art keywords
- guide vane
- blender body
- ammonia
- mixing device
- air mixing
- 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.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/30—Injector mixers
- B01F25/31—Injector mixers in conduits or tubes through which the main component flows
- B01F25/313—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit
- B01F25/3131—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit with additional mixing means other than injector mixers, e.g. screens, baffles or rotating elements
-
- 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
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
-
- 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
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F2025/91—Direction of flow or arrangement of feed and discharge openings
- B01F2025/911—Axial flow
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F2025/91—Direction of flow or arrangement of feed and discharge openings
- B01F2025/919—Direction of flow or arrangement of feed and discharge openings characterised by the disposition of the feed and discharge openings
- B01F2025/9191—Direction of flow or arrangement of feed and discharge openings characterised by the disposition of the feed and discharge openings characterised by the arrangement of the feed openings for one or more flows, e.g. for the mainflow and the flow of an additional component
- B01F2025/91911—Direction of flow or arrangement of feed and discharge openings characterised by the disposition of the feed and discharge openings characterised by the arrangement of the feed openings for one or more flows, e.g. for the mainflow and the flow of an additional component with feed openings in the center of the main flow
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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)
- Treating Waste Gases (AREA)
Abstract
The present invention provides a kind of denitration ammonia air mixing device, including: a blender body, its side connects an air intake section, and opposite side connects a mixed gas outlet section；Near an ammonia jet pipe of described air intake section, the outlet section of ammonia jet pipe is consistent with described blender body axis and is positioned at the center of blender body；The inwall of described blender body is provided with polylith guide vane, and described guide vane interlaced arrangement respectively is in the both sides of described blender body；Described guide vane has at least one through hole with the edge of the side that the inwall of described blender body is connected；The edge of the side that described guide vane is not connected with the inwall of described blender body has uniform multiple elongated slots.There is the effect of ammonia air mix homogeneously, and simple in construction, it is easy to install, overhaul and safeguard, and pressure drop is relatively low, it is possible to avoid producing extra energy consumption, meet the original intention of national requirements energy-saving and emission-reduction, there is bigger promotional value.
Description
Technical field
The present invention relates to environmental technology field, particularly relate to denitrating flue gas processing technology field, be specifically related to a kind of denitration
Ammonia air mixing device.
Background technology
The boiler using Fossil fuel (such as coal, oil, natural gas) produces substantial amounts of flue gas, containing nitrogen oxides in flue gas
(NOx) harmful substance such as, NOx is a kind of greenhouse gases, can damage the ozone layer.Directly harm to health；Participate in being formed
Photochemical fog, forms acid rain, causes environmental pollution；In order to reduce the harm that environment and the mankind are caused by NOx, country is to boiler
The NOx emission concentration produced in flue gas proposes increasingly strict requirements.In order to realize the discharge of NOx lower concentration, alleviate and
Eliminate the NOx harm to the mankind, before boiler smoke is discharged into atmospheric environment, typically through equipment for denitrifying flue gas to remove
Most of NOx in flue gas.
It is dirty that State Development and Reform Commission prints and distributes " coal electricity energy-saving and emission-reduction upgrading and transformation action plan (2014-2020) " air of keeping under strict control
Dye thing discharge.Newly-built Thermal generation unit (be contained in and build the unit having included country's construction of fire and electricity planning with project in) answers synchronized construction
Advanced NO_x Reduction by Effective facility, must not arrange gas bypass passage, newly-built, transformation Thermal generation unit denitration pollution thing concentration of emission
Limit value (i.e. under the conditions of benchmark oxygen content 6%, the highest 50 milligrams/cubic metre of discharged nitrous oxides concentration).Eastern region (the Liao Dynasty
Rather, 11 provinces and cities such as Beijing, Tianjin, Hebei, Shandong, Shanghai, Jiangsu, Zhejiang, Fujian, Guangdong, Hainan) newly-built Thermal generation unit
Air Pollutant Emission concentration basically reach gas turbine group emission limit (i.e. under the conditions of benchmark oxygen content 6%, flue dust, two
Sulfur oxide, discharged nitrous oxides concentration are respectively no higher than 10,35,50 milligrams/cubic metre).Middle part (Heilungkiang, Jilin, mountain
8 provinces such as west, Anhui, Hubei, Hunan, Henan, Jiangxi) new-built unit in principle close to or up gas turbine group emission limit,
Encourage west area new-built unit close to or up gas turbine group emission limit.Support that synchronization is carried out atmosphere pollution and combined association
With removing, reduce the pollutant emissions such as sulfur trioxide, hydrargyrum, arsenic.
In denitrating flue gas processing method, SCR method is a kind of most widely used method, it have process exhaust gas volumn big,
The advantages such as efficiency is high, stable.SCR method is that the catalyst required for denitration reaction is arranged in boiler tail, flue-gas temperature
Typically in the flue region of 290-420 DEG C.Flue gas fills with the reducing agent (generally ammonia) sprayed in flue before by catalyst
Dividing mixing, when flue gas is by catalyst, under the effect of catalyst, the NOx in flue gas reacts with reducing agent ammonia, generates nothing
The N of evil2And water, thus remove the NOx in flue gas.
During denitration reaction, ammonia is requisite as reducing agent.But the aerial volumetric concentration of ammonia reaches
During to 16～25%, the flammable explosive mixture of II class can be formed, there is the biggest potential safety hazard.
Therefore, flue gas denitrification system is required for installing denitration ammonia air mixing systems, ensure that the ammonia of injection flue
Gas and the safety of air mixture, in addition in control blender, the concentration of ammonia is far below its LEL, it is ensured that ammonia exists
It is uniformly distributed in blender.It addition, whether ammonia and air can become that to affect of SCR denitration efficiency important by mix homogeneously
Factor, therefore requires the highest to the blender used.
The most common ammonia air mixer of a great variety, but all there is some defects and deficiency, than if any ammonia
Gas air mixer is poor on medium mixing uniformity；The pressure drop of some ammonia air mixers is relatively big, thus needs to consume
Extra power of fan, improves power consumption；The then structure having is complicated, makes loaded down with trivial details, is unfavorable for installing, overhauling and safeguard.
Summary of the invention
For the problems referred to above, it is an object of the invention to provide a kind of denitration ammonia air mixing device, it is possible to make ammonia
Air uniformly mixes, and the ammonia spraying into denitration reactor inlet flue is uniformly diluted to the ammonia that ammonia level is about 5%
Air gas mixture.Guarantee denitrating system and host computer system energy stable operation, up to standard for denitrating system outlet drain nitrogen oxides
Discharge provides reliable precondition and guarantee.It addition, assembly of the invention not only has the effect of ammonia air mix homogeneously, and structure
Simply, it is easy to install, overhaul and safeguard, and pressure drop is relatively low, it is possible to avoid producing extra energy consumption, meet national requirements energy-conservation
The original intention reduced discharging, has bigger promotional value.
For reaching above-mentioned purpose, the present invention adopts the technical scheme that:
A kind of denitration ammonia air mixing device, including:
One blender body, the side of described blender body connects an air intake section, and opposite side connects a gaseous mixture
Body outlet section；
Stretch into described blender body and the ammonia jet pipe near described air intake section, the injection of described ammonia jet pipe
Described mixed gas outlet is pointed in direction, and the outlet section of ammonia jet pipe is consistent with described blender body axis and is positioned at mixing
The center of device body；
The inwall of described blender body is provided with polylith guide vane, and described guide vane interlaced arrangement respectively is in described
The both sides of blender body；
Described guide vane has at least one through hole with the edge of the side that the inwall of described blender body is connected；Institute
The edge stating the side that guide vane is not connected with the inwall of described blender body has uniform multiple elongated slots.
Further, described guide vane all inwall shapes with described blender body have angle, the angle of described angle
Degree scope is 60 ° to 90 °.Preferably 75 °.
Further, the adjacent axial spacing between described guide vane is equal, is the width of described blender body
Spend or 0.45 to 0.65 times of diameter.
Further, the axial spacing between the guide vane that the spout of distance ammonia jet pipe is nearest is blender body
Width or the 7.5% to 15% of diameter.
Further, the benchmark spacing between the two panels guide vane that the nozzle of described ammonia jet pipe is nearest is mixed
The width of clutch body or 0.45 to 0.65 times of diameter；The adjacent spacing between described guide vane is along the spray of ammonia jet pipe
Penetrate direction to increase successively, the 10% to 15% of a length of described benchmark spacing increased successively.
Further, the quantity of described through hole is odd number, less than 7, along described guide vane with described blender originally
The edge of the side that the inwall of body connects is uniform.
Further, perforated area is inner wall section the 1.5% to 3.5% of described through hole.
Further, on guide vane described in monolithic, the fluting quantity of described elongated slot is 12 to 25.
Further, the width or the 5% to 8% of diameter of a length of blender body of described elongated slot is described elongated
The width of groove is 1mm to 3.5mm.
By taking technique scheme, i.e. be can reach by the guide vane of simple in construction and make air ammonia uniformly mix
Purpose.And by rationally arranging the parameters such as the angle of inclination of guide vane, arrangement pitch, preferable flow-disturbing effect can be obtained
Really, can effectively reduce again pressure drop, thus obtain optimum balance.It addition, the through hole being opened in guide vane edge is possible not only to keep away
Exempt from blender inner body wall adnexa and dead angle occurs, thus obtain more preferably flow-disturbing effect, and the installation at guide vane can be avoided
Junction accumulation impurity or drop etc., it is achieved automatic cleaning, clearing function, reduce the frequency and cost safeguarded.It addition, offer thin
Elongated slot, can quickly break up the ammonia of the ejection of blender body central position, advantageously in ammonia, the uniform mixing of air.
Accompanying drawing explanation
Fig. 1 is the overlooking surface structural representation of the denitration ammonia air mixing device in one embodiment of the invention, has done section view
Process.
Fig. 2 is the side structure schematic diagram of the denitration ammonia air mixing device in one embodiment of the invention, has done local
Section view processes.
Fig. 3 is the structural representation of the ammonia jet pipe in one embodiment of the invention.
Fig. 4 be in Fig. 3 A-A to generalized section.
Fig. 5 be in Fig. 2 B-B to generalized section.
Fig. 6 is the structural representation of the guide vane in one embodiment of the invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Whole description.
As shown in Figures 1 and 2, in one embodiment, it is provided that a kind of denitration ammonia air mixing device, including:
Blender body 1, the side of described blender body connects air intake section 4, and air intake section 4 connects air and enters
Mouth 8；Opposite side connects mixed gas outlet section 6；Mixed gas outlet section 6 connects mixed gas outlet 10；
Stretching into blender body 1 and the ammonia jet pipe 2 near air intake section 4, the injection direction of ammonia jet pipe 2 points to mixed
Close gas outlet 6, and the outlet section of ammonia jet pipe 3 is consistent with blender body 1 axis and is positioned at the centre bit of blender body 1
Put；Such as Fig. 2, ammonia jet pipe 2 includes ammonia entrance 9, elbow linkage section 7 and the ammonia ejection section 3 being sequentially connected with.In conjunction with Fig. 3
And Fig. 4, the end in ammonia ejection section 3 has a main injection jet, and the sidewall in ammonia ejection section 3 uniformly offers multiple auxiliary spray
Hole.
The inwall of blender body 1 is provided with polylith guide vane 5, and guide vane 5 interlaced arrangement respectively is in blender originally
The both sides of body 1；
Edge in the side that each guide vane 5 is connected with the inwall of blender body 1 has a through hole；Guide vane
The edge of 5 sides not being connected with the inwall of blender body 1 has uniform multiple elongated slots.
Wherein, each guide vane 5 all inwalls with blender body 1 form an angle α, and the angular range of angle α is 60 °
To 90 °, preferably 75 °.
The adjacent axial spacing between guide vane 5 is equal, be the width of blender body 1 or the 0.45 of diameter to
0.65 times.The width that axial spacing is blender body or straight between the guide vane that the spout of ammonia jet pipe 2 is nearest
The 7.5% to 15% of footpath.
In further embodiments, the benchmark spacing between the two panels guide vane that the nozzle of distance ammonia jet pipe is nearest
For the width of blender body or 0.45 to 0.65 times of diameter；The adjacent spacing between described guide vane is along ammonia jet pipe
Injection direction increase successively, the 10% to 15% of a length of described benchmark spacing increased successively.This is because the ammonia of injection
The pressure that gas and air and the mixed gas of the two are carried along injection direction gradually reduces, the spacing phase between guide vane
Should incrementally increase, adapt to this kind of pressure trend, be more beneficial for reducing the overall pressure drop of device.
In other embodiments, the quantity of through hole is not limited to one, generally odd number, less than 7, along guide vane with
The edge of the side that the inwall of described blender body connects is uniform.The perforated area of all through holes is the 1.5% of inner wall section
To 3.5%.Calculating according to simulation softward, this percent opening does not interferes with flow-disturbing mixed effect, and can effectively prevent guide vane
Foreign material are accumulated with the junction of inwall.
In conjunction with Fig. 5 and Fig. 6, on monolithic guide vane, the fluting quantity of elongated slot is 12 to 25.Elongated slot a length of
The width of blender body or the 5% to 8% of diameter, the width of elongated slot is 1mm to 3.5mm.By these elongated slots, permissible
Combing blender body radially middle section pressure, ammonia, air and the mixed gas of the two that wind speed is the strongest, promoting mixing
On the basis of, reduce overall pressure drop simultaneously.
In some other embodiment, the length of the elongated slot that each guide vane is offered and this guide vane and described ammonia
The distance of gas blowout pipe is inverse ratio.Similarly, since the ammonia of injection and air and the mixed gas of the two are carried along injection direction
Pressure gradually reduce, the length of elongated slot then progressively shortens accordingly, adapts to this kind of pressure trend, be more beneficial for fall
The overall pressure drop of low device.
By taking technique scheme, i.e. being can reach by the guide vane of simple in construction is that air ammonia uniformly mixes
Purpose.And by rationally arranging the parameters such as the angle of inclination of guide vane, arrangement pitch, preferable flow-disturbing effect can be obtained
Really, can effectively reduce again pressure drop, thus obtain optimum balance.It addition, the through hole being opened in guide vane edge is possible not only to keep away
Exempt from blender inner body wall adnexa and dead angle occurs, thus obtain more preferably flow-disturbing effect, and the installation at guide vane can be avoided
Junction accumulation impurity or drop etc., it is achieved automatic cleaning, clearing function, reduce the frequency and cost safeguarded.It addition, offer thin
Elongated slot, can quickly break up the ammonia of the ejection of blender body central position, advantageously in ammonia, the uniform mixing of air.
Utilize Fluent flow field simulation software, the structure building model described according to above-described embodiment, different size is joined
The ammonia air mixer of number is simulated, and all can obtain preferable mixed effect, and mixed gas uniformity coefficient is good.It addition, at sky
Gas entrance side and mixed gas outlet side detect pressure respectively, its of the more close specification of pressure drop of the device that above-described embodiment describes
His kind existing ammonia air mixer all has and reduces in various degree, and the amplitude that reduces is 3% to 8%.
Obviously, described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Based on this
Embodiment in bright, the every other enforcement that those of ordinary skill in the art are obtained under not making creative work premise
Example, broadly falls into the scope of protection of the invention.
Claims (9)
1. a denitration ammonia air mixing device, it is characterised in that including:
One blender body, the side of described blender body connects an air intake section, and opposite side connects a mixed gas and goes out
Mouth section；
Stretch into described blender body and the ammonia jet pipe near described air intake section, the injection direction of described ammonia jet pipe
Point to described mixed gas outlet, and the outlet section of ammonia jet pipe is consistent with described blender body axis and is positioned at blender originally
The center of body；
The inwall of described blender body is provided with polylith guide vane, and described guide vane interlaced arrangement respectively is in described mixing
The both sides of device body；
Described guide vane has at least one through hole with the edge of the side that the inwall of described blender body is connected；Described lead
The edge of the side that stream blade is not connected with the inwall of described blender body has uniform multiple elongated slots.
2. denitration ammonia air mixing device as claimed in claim 1, it is characterised in that described guide vane is all mixed with described
The inwall shape of clutch body has angle, and the angular range of described angle is 60 ° to 90 °.
3. denitration ammonia air mixing device as claimed in claim 1, it is characterised in that between adjacent described guide vane
Axial spacing equal, be the width of described blender body or 0.45 to 0.65 times of diameter.
4. denitration ammonia air mixing device as claimed in claim 1, it is characterised in that the spout of distance ammonia jet pipe is nearest
Guide vane between the width or the 7.5% to 15% of diameter that axial spacing is blender body.
5. denitration ammonia air mixing device as claimed in claim 1, it is characterised in that apart from the nozzle of described ammonia jet pipe
The width that a benchmark spacing is blender body between nearest two panels guide vane or 0.45 to 0.65 times of diameter；Adjacent
Described guide vane between spacing increase successively along the injection direction of ammonia jet pipe, a length of described benchmark increased successively
The 10% to 15% of spacing.
6. denitration ammonia air mixing device as claimed in claim 1, it is characterised in that the quantity of described through hole is odd number,
Less than 7, uniform along the edge of the side that described guide vane is connected with the inwall of described blender body.
7. denitration ammonia air mixing device as claimed in claim 6, it is characterised in that the perforated area of described through hole is interior
The 1.5% to 3.5% of wall area of section.
8. denitration ammonia air mixing device as claimed in claim 1, it is characterised in that described on guide vane described in monolithic
The fluting quantity of elongated slot is 12 to 25.
9. denitration ammonia air mixing device as claimed in claim 8, it is characterised in that a length of mixing of described elongated slot
The width of device body or the 5% to 8% of diameter, the width of described elongated slot is 1mm to 3.5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610652723.9A CN106139946B (en) | 2016-08-10 | 2016-08-10 | Denitration ammonia air mixing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610652723.9A CN106139946B (en) | 2016-08-10 | 2016-08-10 | Denitration ammonia air mixing device |
Publications (2)
| Publication Number | Publication Date |
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| CN106139946A true CN106139946A (en) | 2016-11-23 |
| CN106139946B CN106139946B (en) | 2020-01-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610652723.9A Active CN106139946B (en) | 2016-08-10 | 2016-08-10 | Denitration ammonia air mixing device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112057713A (en) * | 2020-09-18 | 2020-12-11 | 德阳市人民医院 | Oxygen therapeutic machine capable of timing |
| CN112984502A (en) * | 2021-01-27 | 2021-06-18 | 杭州聚能环保科技股份有限公司 | Micro-discharge pulverized coal combustion system |
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| CN206199038U (en) * | 2016-08-10 | 2017-05-31 | 大唐环境产业集团股份有限公司 | A kind of denitration ammonia air mixing device |
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| CN1126106A (en) * | 1994-05-20 | 1996-07-10 | 奥托孔普工程承包商公司 | Method and apparatus for forming controlled vortexes and for recirculating gas |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112057713A (en) * | 2020-09-18 | 2020-12-11 | 德阳市人民医院 | Oxygen therapeutic machine capable of timing |
| CN112984502A (en) * | 2021-01-27 | 2021-06-18 | 杭州聚能环保科技股份有限公司 | Micro-discharge pulverized coal combustion system |
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| Publication number | Publication date |
|---|---|
| CN106139946B (en) | 2020-01-07 |
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