CN105464763B - A kind of potent mixing arrangement of urea for medium and small-scale vessel SCR system - Google Patents
A kind of potent mixing arrangement of urea for medium and small-scale vessel SCR system Download PDFInfo
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- CN105464763B CN105464763B CN201510807952.9A CN201510807952A CN105464763B CN 105464763 B CN105464763 B CN 105464763B CN 201510807952 A CN201510807952 A CN 201510807952A CN 105464763 B CN105464763 B CN 105464763B
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- urea
- steel bar
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2590/00—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines
- F01N2590/02—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines for marine vessels or naval applications
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The present invention relates to ship flue gas denitrification equipment field, and in particular to a kind of potent mixing arrangement of urea for medium and small-scale vessel SCR system.A kind of potent mixing arrangement of urea for medium and small-scale vessel SCR system, porous plate, urea nozzle and the blender that the device includes body and is arranged on from bottom to top in body, described fairing is the porous plate that multiple circular holes are distributed with, and described disturbing flow device is blender.Advantage of the invention is that the upstream of urea nozzle sets fairing（Porous plate）The downstream of urea nozzle sets disturbing flow device, the structure can make flue gas and urea be sprayed in limited space and more fully be mixed, urea spraying can absorb more fume waste heats in the short period of time and improve decomposition rate, so as to which NH3/NOX concentration proportions reach reaction requirement when ensureing that mixed flue gas is reached at SCR reactor inlets.
Description
Technical field
The present invention relates to ship flue gas denitrification equipment field, and in particular to a kind of urine for medium and small-scale vessel SCR system
The potent mixing arrangement of element.
Background technology
With the propulsion to work air contaminant treatment, the emission problem of Pollution From Ships thing also gradually highlights and by weight
Depending on.International Maritime Organization（IMO）Marine Environmental Protection Committee (MEPC) is in October, 2008 to " world prevents ship from causing dirt
Dye pact (MERPOL) " supplemental provisions VI is corrected, discharged nitrous oxides when being navigated by water to ship in offshore discharge restricted area
Propose tightened up standard, it is desirable to which nitrogen oxide emission reaches Tier III standards, to safeguard the big compression ring of offshore sea waters
Border and the health care of coastal resident.
SCR（Selective Catalytic Reduction, SCR ）It is the engine of current main-stream
Tail gas denitration technology, nitrogen oxides can be effectively removed, ship tail gas can be made to reach Tier III discharge standards.Using urea as system
The ship SCR system operational management cost of ammonia raw material is relatively low, and urea is readily transported, stores and used without danger.In this skill
In art, aqueous solution of urea jet atomization quality, the pyrolysis efficiency of urea, the mixing uniformity of ammonia and flue gas takes off to system
Nitre efficiency, the escaping of ammonia rate and service life have a great impact.
Also there is the case that urea blender is applied in SCR denitration system in the prior art.Such as Chinese patent CN
The X-shaped static mixer of 201200864 Y designs, effectively enhances the disturbance in fluid retention area, improves flue gas and NH3's
Mixed effect.But the patent is bad to the adaptability of ship actual operating mode.During shipping work, its operating condition is complicated
Changeable, flue gas flow field skewness during variable working condition, the blender plate in the design is arranged can not change well in the same direction
Kind NH3/NOXThe problem of concentration space skewness.The A of Chinese patent CN 101900018 propose one kind and are oppositely arranged by multipair
Blade to the urea mixing device of composition, exhaust can be made to produce strong flow perturbation when passing through blender, mixed effect is good
It is good, and symmetrical configuration, it is easily manufactured.But the Patent design can produce no small pressure drop, exhaust back pressure rise and engine are brought
The adverse effect of effective power consume.The static mixer of the B of Chinese patent CN 102242662 designs is arranged on urea nozzle
Upstream so that the even flow field at urea nozzle, disturbance enhancing.But mixing arrangement is not provided with urea nozzle downstream, downstream is disturbed
It is dynamic ineffective, fluid retention area, urea spraying and flue gas undercompounding be present, urea liquid can not make full use of flue gas hot
Amount is evaporated and is pyrolyzed, and urea pyrolysis efficiency reduces.Area of topical hypothermia is also easy to form deposit, causes service life of equipment
Shortening and line clogging.
The content of the invention
The present invention is directed to urea spraying in existing SCR system and uneven, the inefficient easily life of urea pyrolysis is mixed with flue gas
Into deposit, pressure drop is larger, SCR catalyst entrance velocity deviation and NH3/NOXThe defects of concentration deviation is larger, there is provided Yi Zhongyong
In the potent mixing arrangement of the urea of medium and small-scale vessel SCR system.
The technical solution adopted for the present invention to solve the technical problems is：
A kind of potent mixing arrangement of urea for medium and small-scale vessel SCR system, the device is including body and from bottom to top
Porous plate, urea nozzle and blender in body, described fairing are the porous plate that multiple circular holes are distributed with,
Described disturbing flow device is blender.Advantage of the invention is that the upstream of urea nozzle sets fairing（Porous plate）, urine
The downstream of plain nozzle sets disturbing flow device, and the structure can make flue gas and urea be sprayed in limited space and obtain more fully
Mixing, urea spraying can absorb more fume waste heats in the short period of time and improve decomposition rate, so as to ensure to mix cigarette
Gas reaches NH when at SCR reactor inlets3/NOXConcentration proportion reaches reaction and required.
Preferably, porous plate is arranged at the 200cm-340cm of urea nozzle upstream, blender is arranged under urea nozzle
Swim at 300cm-500cm.Porous plate, urea nozzle, blender are sequentially arranged in pipeline along flow of flue gas direction.
Preferably, porous plate is a diameter of 300mm-330mm, thickness is 4mm-8mm circular stainless steel plate.
The distribution preferably, circular hole is centrosymmetric on porous plate, the center of circle of each circular hole is at intervals of 22mm-
26mm；Along porous plate radial direction from the inside to surface, the center of circle of each layer circular hole is on a series of concentric circles；Circularhole diameter is 16mm-
20mm.To ensure even flow field and certain backpressure requirements, the percent opening of porous plate need to be between 40%-55%.Engines tail
For gas after porous plate, velocity field can become uniform, and droplet that the nozzle in porous plate downstream sprays could be with tail gas evenly
Mixing, it is possible to increase denitration efficiency 10% -15%.
Preferably, blender main body is stainless steel tube, support frame is provided with stainless steel tube, is fixed with support frame
Fin, fin are centrosymmetric distribution in stainless steel tube.
Preferably, support frame is by two mutually perpendicular long steel bars and the 4 short steel bar group being fixed on long steel bar
Diametric(al) into, long steel bar along stainless steel tube is set, and the crosspoints of two root long steel bars is the center of circle of stainless steel tube, short steel bar
It is perpendicularly fixed on a root long steel bar and parallel with another root long steel bar；4 short steel bars are diametrically centrosymmetric distribution.
Preferably, the length of stainless steel tube is 45mm-55mm, a diameter of 5mm-8mm of long steel bar, length 300mm-
330mm, short steel bar is with parallel long steel bar at a distance of 54mm-58mm.Two mutually perpendicular long steel bars are by the circle of stainless steel tube
Section is divided into four parts.Fix a short steel bar respectively in four identical sector regions, short steel bar is fixed on long steel bar
At 1/4 and 3/4, and it is parallel with another root long steel bar.
Preferably, fin is by the long 120mm-130mm of two block size identicals, wide 40mm-48mm, thick 1.0mm-
3.0mm 90 ° of cross welds of steel disc form.According to different flue cross section sizes, fin size can be varied from.It is general next
Say, the area that fin is projeced into the flue cross section at place, which accounts for 45% that flue cross section is accumulated, to be advisable.Crossing conference increases tail gas resistance
Add, it is too small, disturb insufficient.
Preferably, welding one group of fin on the midpoint of every short steel bar, make steel disc short side and corresponding short steel bar place
The plan range perpendicular to long steel bar be 42mm-46mm.4 groups of fins are made to be uniformly distributed in flue cross section, tail gas is through overmulling
Strong disturbance can be produced during clutch, is sufficiently mixed tail gas and the reducing agent ejected through upstream nozzle, promotes reducing agent dense
The uniformity of field and the uniformity of tail gas velocity field are spent, denitration efficiency is both enhanced, prevents catalyst surface from wearing again.
Preferably, described urea nozzle avoids the corrosion of urea using materials such as SUS 304, SUS 316；It is porous
Plate and blender use SUS 304 or carbon steel material, and material selection gist exhaust gas volumn and nitrous oxides concentration are weighed.
The setting of the porous plate of upstream can be well adapted for that medium and small-scale vessel space is small, vibration is big, operating mode is complicated and changeable
Actual conditions.For tail gas after porous plate, flue gas has formed the flow field for being evenly distributed and having and necessarily disturb at urea nozzle.
Ship power condition changing or vibration cause be vented skewness in the case of also can guarantee that atomization quality and spraying with flue gas and
When effectively mix.Two pieces of steel discs of fin are formed in downstream mixer structure in 90 ° of intersections so that the stream at each steel disc back side
Body stagnant area has the air-flow for flowing through another steel disc to fill and forms vortex, greatly enhances the disturbance in fluid retention area.Urea
Spraying can be mixed substantially more with flue gas, and urea liquid drop absorbs more fume waste heat evaporations within the shorter time
Pyrolysis, urea pyrolysis efficiency improve, and generate more reducing agent NH3, reduce the waste of urea liquid.Urea nozzle downstream
The enhancing of flow perturbation reduces the presence in area of topical hypothermia, effectively improve because of topical hypothermia and caused by depositional phenomenon, prolong
Long service life of equipment, the adverse consequences for avoiding line clogging from bringing.
The pressure drop of the potent mixing arrangement of urea of the present invention is little, can reduce the loss of effective engine power.And device
It is simple in construction, it is easily manufactured, steel disc equidimension in porous plate circular hole and blender can be adjusted according to the requirement of actual conditions, with
The effect being optimal.Finally more uniform speed and NH are formed in SCR catalyst porch3/NOXConcentration distribution, improve
The denitration performance of SCR system, reduce urea liquid waste and the escaping of ammonia caused by pollution.
Brief description of the drawings
Fig. 1 is the structural representation of porous plate；
Fig. 2 is for blender dimensional structure diagram；
Fig. 3 is blender plane design drawing；
Fig. 4 is the structural representation of the potent mixing arrangement of urea of the present invention；
Fig. 5 is that the potent mixing arrangement of urea of the present invention is arranged on side view in ship exhaust uptake；
In figure：1. 6. circular hole of adpting flange 2. body, 3. porous plate, 4. urea nozzle, 5. blender, 7. long steel bar
8. the short stainless steel tube of 9. steel disc 10.SCR catalyst converters of steel bar 11..
Embodiment
Below by specific embodiment, and with reference to accompanying drawing, technical scheme is described in further detail.Should
Work as understanding, implementation of the invention is not limited to the following examples, any formal accommodation for being done to the present invention and/or
Change falls within the scope of the present invention.
Embodiment 1
A kind of potent mixing arrangement of urea for medium and small-scale vessel SCR system, as shown in figure 4, the device includes body
Porous plate, urea nozzle 4 and the blender being arranged on from bottom to top in body, described fairing are that multiple circles are distributed with
The porous plate 3 in hole, described disturbing flow device are blender 5, and it is in criss-cross fin that 4 are fixed with blender, and fin is by two
Piece flat board is staggered to form.Porous plate is arranged at the 340cm of urea nozzle upstream, and blender is arranged on urea nozzle downstream 500cm
Place.Porous plate, urea nozzle, blender are sequentially arranged in pipeline along flow of flue gas direction.It is welded with and is used for and SCR on body
The adpting flange 1 that system is connected.
The structure of porous plate is shown in Fig. 1, and porous plate is made up of one piece of diameter 330mm, thick 10mm circular steel plate.Pressed on plate
Certain rule is dispersed with circular hole 6：Circular hole is centrosymmetric distribution on porous plate, circular hole center of circle interval 26mm；In porous plate
The heart is first circular hole, and, the center of circle of each layer circular hole is on a series of concentric circles along porous plate radial direction from the inside to surface；Circular hole is straight
Footpath is 20mm.
The structure of blender such as Fig. 2 and Fig. 3, blender main body are stainless steel tube, are provided with support frame in stainless steel tube, prop up
It is fixed with fin on support frame frame, fin is centrosymmetric distribution in stainless steel tube.Support frame is by two mutually perpendicular length
Steel bar 7 and the 4 short steel bar 8 being fixed on long steel bar are formed, and diametric(al) of the long steel bar along stainless steel tube is set, two root long steel
The crosspoint of bar is the center of circle of stainless steel tube, and short steel bar is perpendicularly fixed on a root long steel bar and equal with another root long steel bar
OK；4 short steel bars are diametrically centrosymmetric distribution.The length of stainless steel tube is 55mm, a diameter of 8mm of long steel bar, length
For 330mm, short steel bar is with parallel long steel bar at a distance of 58mm.
The circular cross-section of blender is divided into four sectors by support frame.It is short that one is fixed respectively in four sector regions
Steel bar, on each short steel bar welding the fin formed is intersected by two pieces of 9 90 ° of steel disc, every steel disc is in flue cross section
45 ° of angles.The long 130mm of steel disc, wide 48mm, thick 3.0mm.
Porous plate 3, urea nozzle 4, blender 5 are sequentially arranged in pipeline along flow of flue gas direction.Porous plate is arranged on
Nozzle upstream is about at 200-340cm, and blender is arranged on nozzle downstream about at 300-500cm, as shown in Figure 4.
Embodiment 2
A kind of potent mixing arrangement of urea for medium and small-scale vessel SCR system, as shown in figure 4, the device includes body
Porous plate, urea nozzle 4 and the blender being arranged on from bottom to top in body, described fairing are that multiple circles are distributed with
The porous plate 3 in hole, described disturbing flow device are blender 5, and it is in criss-cross fin that 4 are fixed with blender, and fin is by two
Piece flat board is staggered to form.Porous plate is arranged at the 200cm of urea nozzle upstream, and blender is arranged on urea nozzle downstream 300cm
Place.Porous plate, urea nozzle, blender are sequentially arranged in pipeline along flow of flue gas direction.It is welded with and is used for and SCR on body
The adpting flange 1 that system is connected.
The structure of porous plate is shown in Fig. 1, and porous plate is made up of one piece of diameter 300mm, thick 8mm circular steel plate.Pressed on plate
Certain rule is dispersed with circular hole 6：Circular hole is centrosymmetric distribution on porous plate, circular hole center of circle interval 22mm；In porous plate
The heart is first circular hole, and, the center of circle of each layer circular hole is on a series of concentric circles along porous plate radial direction from the inside to surface；Circular hole is straight
Footpath is 16mm.
The structure of blender such as Fig. 2 and Fig. 3, blender main body are stainless steel tube, are provided with support frame in stainless steel tube, prop up
It is fixed with fin on support frame frame, fin is centrosymmetric distribution in stainless steel tube.Support frame is by two mutually perpendicular length
Steel bar 7 and the 4 short steel bar 8 being fixed on long steel bar are formed, and diametric(al) of the long steel bar along stainless steel tube is set, two root long steel
The crosspoint of bar is the center of circle of stainless steel tube, and short steel bar is perpendicularly fixed on a root long steel bar and equal with another root long steel bar
OK；4 short steel bars are diametrically centrosymmetric distribution.The length of stainless steel tube is 45mm, a diameter of 5mm of long steel bar, length
For 300mm, short steel bar is with parallel long steel bar at a distance of 54mm.
The circular cross-section of blender is divided into four sectors by support frame.It is short that one is fixed respectively in four sector regions
Steel bar, on each short steel bar welding the fin formed is intersected by two pieces of 9 90 ° of steel disc, every steel disc is in flue cross section
45 ° of angles.The long 120mm of steel disc, wide 40mm, thick 1.0mm.
Porous plate 3, urea nozzle 4, blender 5 are sequentially arranged in pipeline along flow of flue gas direction.Porous plate is arranged on
Nozzle upstream is about at 200-340cm, and blender is arranged on nozzle downstream about at 300-500cm, as shown in Figure 4.
So that the potent mixing arrangement of the urea shown in Fig. 5 is arranged in certain ship exhaust duct as an example, the potent mixing dress of urea
The lower section put is connected with flue gas into pipeline, and the top of the potent mixing arrangement of urea is connected with SCR catalyst 10.Flue gas stream is from pipe
Road junction enters, and preliminary disturbance is formed after porous plate, is formed at urea nozzle uniformly and has the flow field of certain strength of turbulence,
It ensure that urea spraying more sufficiently mixes with flue gas under various operating modes.Mixed flue gas flows through blender afterwards, disturb into
One step is strengthened.The resolution ratio of urea improves, catabolite NH3Mixed with flue gas it is more abundant, in the porch of SCR catalyst 10
Form flue gas flow rate and NH3The flow field of/NO even concentrations.After tested, this device can effectively improve the denitration of ship SCR system
Efficiency, denitration efficiency reaches more than 95% when optimal.Reduce waste and the escaping of ammonia rate of urea liquid.
Embodiment described above is a kind of preferable scheme of the present invention, not the present invention is made any formal
Limitation, there are other variants and remodeling on the premise of without departing from the technical scheme described in claim.
Claims (4)
- A kind of 1. potent mixing arrangement of urea for medium and small-scale vessel SCR system, it is characterised in that：The device include body and Fairing, urea nozzle and the disturbing flow device being arranged on from bottom to top in body, described fairing are multiple to be distributed with The porous plate of circular hole, described disturbing flow device are blender, and it is in criss-cross fin that several are fixed with blender, fin by Two panels flat board is staggered to form；Porous plate is arranged at the 200cm-340cm of urea nozzle upstream, and blender is arranged on urea nozzle downstream 300cm-500cm Place；The circular hole is centrosymmetric distribution on porous plate, and the center of circle of each circular hole is at intervals of 22mm-26mm；Along porous plate radius From the inside to surface, the center of circle of each layer circular hole is on a series of concentric circles in direction；Circularhole diameter is 16mm-20mm；Blender main body is stainless steel tube, is provided with support frame in stainless steel tube, is fixed with fin in support frame, fin is not Be centrosymmetric distribution in rust steel pipe；Support frame is by two mutually perpendicular long steel bars and is fixed on long steel bar 4 short Steel bar is formed, and diametric(al) of the long steel bar along stainless steel tube is set, and the crosspoint of two root long steel bars is the center of circle of stainless steel tube, Short steel bar is perpendicularly fixed on a root long steel bar and parallel with another root long steel bar；4 short steel bars are in diametrically center pair Claim distribution；The length of stainless steel tube is 45mm-55mm, a diameter of 5mm-8mm of long steel bar, length 300mm-330mm, short steel bar With parallel long steel bar at a distance of 54mm-58mm；A fin is welded on the midpoint of every short steel bar, fin is by two block sizes Identical steel disc is welded, and the plan range perpendicular to long steel bar where making steel disc short side and corresponding short steel bar is 42mm- 46mm。
- 2. the urea potent mixing arrangement according to claim 1 for medium and small-scale vessel SCR system, it is characterised in that： Porous plate is a diameter of 300mm-330mm, and thickness is 4mm-8mm circular stainless steel plate.
- 3. the urea potent mixing arrangement according to claim 1 for medium and small-scale vessel SCR system, it is characterised in that： The percent opening of porous plate is 40%-55%.
- 4. the urea potent mixing arrangement according to claim 1 for medium and small-scale vessel SCR system, it is characterised in that： Fin is by two block sizes are identical, long 120mm-130mm, wide 40mm-48mm, thick 1.0mm-3.0mm 90 ° of cross welds of steel disc Form.
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10378413B2 (en) * | 2016-07-20 | 2019-08-13 | Ford Global Technologies, Llc | Urea mixer |
| CN107376644B (en) * | 2017-06-14 | 2020-07-28 | 北京福田戴姆勒汽车有限公司 | Urea mixed flow structure of tail gas treatment system |
| CN107376645A (en) * | 2017-06-14 | 2017-11-24 | 北京福田戴姆勒汽车有限公司 | Exhaust treatment system |
| GB2569339B (en) * | 2017-12-14 | 2020-10-14 | Perkins Engines Co Ltd | Exhaust treatment system for an engine |
| CN108167050A (en) * | 2017-12-23 | 2018-06-15 | 无锡威孚力达催化净化器有限责任公司 | Cartridge type SCR post-processes mixing arrangement |
| CN109529622B (en) * | 2019-01-16 | 2023-11-14 | 北京工大环能科技有限公司 | Flue gas tail denitration system for multiple gas internal combustion engines |
| CN111577431A (en) * | 2020-05-11 | 2020-08-25 | 江苏科技大学 | Marine SCR system mixer |
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| US6401455B1 (en) * | 1997-07-24 | 2002-06-11 | Siemens Aktiengesellschaft | Exhaust emission control system for the exhaust gas of a diesel engine |
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| CN104963750A (en) * | 2015-07-07 | 2015-10-07 | 江苏科技大学 | Static mixing device for SCR system of high-power diesel engine |
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| US6401455B1 (en) * | 1997-07-24 | 2002-06-11 | Siemens Aktiengesellschaft | Exhaust emission control system for the exhaust gas of a diesel engine |
| 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 |
| CN103768938A (en) * | 2013-12-05 | 2014-05-07 | 浙江大学 | Ammonia-flue gas uniformly mixing device |
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