CN105464763A - Urea powerful mixing device for SCR system of small and medium-sized ship - Google Patents
Urea powerful mixing device for SCR system of small and medium-sized ship Download PDFInfo
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- CN105464763A CN105464763A CN201510807952.9A CN201510807952A CN105464763A CN 105464763 A CN105464763 A CN 105464763A CN 201510807952 A CN201510807952 A CN 201510807952A CN 105464763 A CN105464763 A CN 105464763A
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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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- 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 invention relates to the field of ship flue gas denitrification equipment, in particular to a urea powerful mixing device for an SCR system of a small and medium-sized ship. The urea powerful mixing device for the SCR system of the small and medium-sized ship comprises a tube body, a porous plate, a urea nozzle and a mixing device, wherein the porous plate, the urea nozzle and the mixing device are arranged in the tube body from bottom to top; a flow rectifying device is the porous plate where a plurality of round holes are distributed, and a flow disturbing device is the mixing device; and the device has the beneficial effects that the flow rectifying device (porous plate) is arranged at the upstream position of the urea nozzle, the flow disturbing device is arranged at the downstream position of the urea nozzle, and due to the structure, smoke and sprayed urea mist can be more sufficiently mixed in the limited space, the urea nozzle can absorb more smoke gas waste heat in a short time so as to improve the decomposition speed, and therefore it can be ensured that the concentration ratio of NH3/NOX meets the reaction requirement when mixed smoke gas enters an SCR reactor inlet.
Description
Technical field
The present invention relates to boats and ships flue gas denitrification equipment field, be specifically related to the potent mixing arrangement of a kind of urea for medium and small-scale vessel SCR system.
Background technique
Along with the propelling to air contaminant treatment work, the emission problem of Pollution From Ships thing also highlights gradually and comes into one's own.International Maritime Organization (IMO) Marine Environmental Protection Committee (MEPC) is revised in October, 2008 " MARPOL (MERPOL) " supplemental provisions VI; discharged nitrous oxides when navigating by water in offshore discharge restricted area to boats and ships proposes stricter standard; require that nitrogen oxide emission reaches TierIII standard, with the health care of the atmosphere environment and coastal resident of safeguarding offshore sea waters.
Selective catalytic reduction (SelectiveCatalyticReduction, SCR) is the motor exhaust denitration technology of current main-stream, effectively can remove nitrogen oxide, and ship tail gas can be made to reach TierIII emission standard.The boats and ships SCR system operation management cost taking urea as feed for ammonia production is lower, and urea is without danger, is convenient to transport, stores and use.In this technique, aqueous solution of urea jet atomization quality, the pyrolysis efficiency of urea, the mixing uniformity of ammonia and flue gas is to the denitration efficiency of system, and the escaping of ammonia rate and working life have a great impact.
Also the case applying urea mixer in SCR denitration system is had in prior art.As the X-shaped static mixer that Chinese patent CN201200864Y designs, effectively enhance the disturbance in fluid retention district, improve flue gas and NH
3mixed effect.But this patent is not good to the adaptability of boats and ships actual operating mode.In shipping work process, its operating conditions is complicated and changeable, flue gas flow field skewness during variable working condition, and the mixer plate in this design is arranged in the same direction and can not be improved NH well
3/ NO
xthe problem of concentration space skewness.Chinese patent CN101900018A propose a kind of by the multipair blade be oppositely arranged to the urea mixing device formed, exhaust can be made by producing strong flow perturbation during mixer, and mixed effect is good, and symmetrical configuration, easily manufactured.But this Patent design can produce no small pressure drop, bring the adverse effect that exhaust back pressure raises and effective engine power consumes.The static mixer that Chinese patent CN102242662B designs is arranged on the upstream of urea nozzle, makes the even flow field at urea nozzle place, and disturbance strengthens.But do not arrange mixing arrangement in urea nozzle downstream, downstream disturbances poor effect, there is fluid retention district, urea spraying and flue gas undercompounding, urea liquid can not make full use of flue gas heat to carry out evaporating and pyrolysis, and urea pyrolysis efficiency reduces.District of topical hypothermia also easily forms sediments, causes service life of equipment to shorten and line clogging.
Summary of the invention
The present invention is directed to urea spraying in existing SCR system mixes uneven with flue gas, the not high easy generation sediments of urea pyrolysis efficiency, pressure drop is comparatively large, SCR catalyst entrance velocity deviation and NH
3/ NO
xthe defects such as concentration deviation is larger, provide a kind of urea for medium and small-scale vessel SCR system potent mixing arrangement.
The technical solution adopted for the present invention to solve the technical problems is:
The potent mixing arrangement of a kind of urea for medium and small-scale vessel SCR system, this device comprises body and is arranged on porous slab, urea nozzle and the mixer in body from bottom to top, described rectifying device is the porous slab being distributed with multiple circular hole, and described disturbing flow device is mixer.Advantage of the present invention is that the upstream of urea nozzle arranges rectifying device (porous slab), the downstream of urea nozzle arranges disturbing flow device, this structure can make flue gas and urea be sprayed in limited space to be mixed more fully, urea spraying can absorb more fume waste heat in the short period of time and improve decomposition rate, thus NH when ensureing mixed flue gas arrival SCR reactor inlet place
3/ NO
xconcentration proportion reaches reaction requirement.
As preferably, porous slab is arranged on 200cm-340cm place, urea nozzle upstream, and mixer is arranged on 300cm-500cm place, urea nozzle downstream.Porous slab, urea nozzle, mixer are arranged in pipeline successively along flow of flue gas direction.
As preferably, porous slab is diameter is 300mm-330mm, and thick is the circular corrosion resistant plate of 4mm-8mm.
As preferably, described circular hole is centrosymmetric distribution on porous slab, and the center of circle of each circular hole is spaced apart 22mm-26mm; Along porous slab radial direction from the inside to surface, the center of circle of each layer circular hole is on a series of concentric circle; Circularhole diameter is 16mm-20mm.For ensureing even flow field and certain backpressure requirements, the percent opening of porous slab need between 40%-55%.Motor exhaust is after porous slab, and velocity field can become even, the droplet of the nozzle in porous slab downstream ejection could and tail gas evenly mixing, can denitration efficiency 10%-15% be improved.
As preferably, mixer main body is Stainless Steel Tube, is provided with support frame in Stainless Steel Tube, and support frame is fixed with fin, and fin is centrosymmetric distribution in Stainless Steel Tube.
As preferably, support frame is made up of two mutually perpendicular long steel bars and the 4 short steel bars be fixed on long steel bar, long steel bar is arranged along the diametric(al) of Stainless Steel Tube, the point of intersection of two long steel bars is the center of circle of Stainless Steel Tube, and short steel bar to be vertically fixed on a long steel bar and to parallel with the long steel bar of another root; 4 short steel bars are centrosymmetric distribution diametrically.
As preferably, the length of Stainless Steel Tube is 45mm-55mm, and long steel bar diameter is 5mm-8mm, length is 300mm-330mm, and short steel bar and parallel long steel bar are at a distance of 54mm-58mm.The circular cross-section of Stainless Steel Tube is divided into four parts by two mutually perpendicular long steel bars.In four identical sector regions, fix a short steel bar respectively, short steel bar is fixed on long steel bar 1/4 and 3/4 place, and parallel with the long steel bar of another root.
As preferably, fin is formed by steel disc 90 ° of cross welds of two pieces of measure-alike long 120mm-130mm, wide 40mm-48mm, thick 1.0mm-3.0mm.According to different flue sectional dimensions, fin size can change to some extent.In general, the fin area be projeced on the flue cross section at place accounts for 45% of flue sectional area and is advisable.Crossing conference makes tail gas resistance increase, and too small then disturbance is insufficient.
As preferably, the mid point of the short steel bar of every root welds one group of fin, make the plan range perpendicular to long steel bar at steel disc minor face and corresponding short steel bar place be 42mm-46mm.4 groups of fins are uniformly distributed on flue cross section, tail gas can produce strong disturbance through mixer, make tail gas and fully mix through the reducing agent that upstream nozzle ejects, promote the uniformity of reductant concentration field and the uniformity of tail gas velocity field, both enhance denitration efficiency, and prevent again catalyst surface from wearing and tearing.
As preferably, described urea nozzle uses the materials such as SUS304, SUS316, avoids the corrosion of urea; Porous slab and mixer adopt SUS304 or carbon steel material, and Material selec-tion is weighed according to exhaust gas volumn and nitrous oxides concentration.
The setting of the porous slab of upstream can adapt to the actual conditions that medium and small-scale vessel space is little, vibration is large, operating mode is complicated and changeable well.Tail gas is after porous slab, and flue gas has been formed at urea nozzle place and has been evenly distributed and has the flow field of certain disturbance.Cause when exhaust skewness at boats and ships power condition changing or vibration and also can ensure that atomization quality and spraying mix timely and effectively with flue gas.The two pieces of steel discs forming fin in mixed downstream device structure are 90 ° of intersections, make the fluid retention district at each steel disc back side have the air-flow flowing through another steel disc fill and form eddy current, the disturbance in fluid retention district is strengthened greatly.Urea spraying can mix more fully with flue gas, and urea liquid drop absorbs more fume waste heat evaporation pyrolysis within the shorter time, and urea pyrolysis efficiency improves, and creates more reducing agent NH
3, decrease the waste of urea liquid.The enhancing of urea nozzle downstream airflow disturbance decreases the existence in district of topical hypothermia, effectively improves the depositional phenomenon caused because of topical hypothermia, extension device working life, avoids the adverse consequences that line clogging brings.
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 apparatus structure is simple, easily manufactured, steel disc equidimension in porous slab circular hole and mixer can be adjusted according to the requirement of actual conditions, to reach optimum effect.Comparatively uniform speed and NH is finally formed in SCR catalyst ingress
3/ NO
xcONCENTRATION DISTRIBUTION, improves the denitration performance of SCR system, decreases the pollution that the waste of urea liquid and the escaping of ammonia cause.
Accompanying drawing explanation
Fig. 1 is the structural representation of porous slab;
Fig. 2 is mixer perspective view;
Fig. 3 is mixer 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 boats and ships draught flue;
In figure: 1. the adpting flange 2. body 3. porous slab 4. urea nozzle 5. mixer 6. long steel bar 8. of circular hole 7. short steel bar 9. steel disc 10.SCR catalyst converter 11. Stainless Steel Tube.
Embodiment
Below by specific embodiment, and by reference to the accompanying drawings, technological scheme of the present invention is described in further detail.Should be appreciated that enforcement of the present invention is not limited to the following examples, any pro forma accommodation make the present invention and/or change all will fall into scope.
Embodiment 1
The potent mixing arrangement of a kind of urea for medium and small-scale vessel SCR system, as shown in Figure 4, this device comprises body and is arranged on porous slab, urea nozzle 4 and the mixer in body from bottom to top, described rectifying device is the porous slab 3 being distributed with multiple circular hole, described disturbing flow device is mixer 5, mixer is fixed with 4 in criss-cross fin, fin is staggered to form by two panels flat board.Porous slab is arranged on 340cm place, urea nozzle upstream, and mixer is arranged on 500cm place, urea nozzle downstream.Porous slab, urea nozzle, mixer are arranged in pipeline successively along flow of flue gas direction.Body is welded with the adpting flange 1 for being connected with SCR system.
The structure of porous slab is shown in Fig. 1, and porous slab is made up of the circular steel plate of one piece of diameter 330mm, thick 10mm.Plate is dispersed with circular hole 6 according to certain rules: circular hole is centrosymmetric distribution on porous slab, circular hole center of circle interval 26mm; The center of porous slab is first circular hole, and along porous slab radial direction from the inside to surface, the center of circle of each layer circular hole is on a series of concentric circle; Circularhole diameter is 20mm.
The structure of mixer is as Fig. 2 and Fig. 3, and mixer main body is Stainless Steel Tube, is provided with support frame in Stainless Steel Tube, and support frame is fixed with fin, and fin is centrosymmetric distribution in Stainless Steel Tube.Support frame is made up of two mutually perpendicular long steel bars 7 and the 4 short steel bars 8 be fixed on long steel bar, long steel bar is arranged along the diametric(al) of Stainless Steel Tube, the point of intersection of two long steel bars is the center of circle of Stainless Steel Tube, and short steel bar to be vertically fixed on a long steel bar and to parallel with the long steel bar of another root; 4 short steel bars are centrosymmetric distribution diametrically.The length of Stainless Steel Tube is 55mm, and long steel bar diameter is 8mm, length is 330mm, and short steel bar and parallel long steel bar are at a distance of 58mm.
The circular cross-section of mixer is divided into four sectors by support frame.Fix a short steel bar respectively at four sector regions, each short steel bar welds and intersects by the steel disc 990 ° of two pieces the fin formed, every sheet steel disc and flue cross section are 45 ° of angles.The long 130mm of steel disc, wide 48mm, thick 3.0mm.
Porous slab 3, urea nozzle 4, mixer 5 are arranged in pipeline successively along flow of flue gas direction.Porous slab is arranged on nozzle upstream about 200-340cm place, and mixer is arranged on about 300-500cm place, nozzle downstream, as shown in Figure 4.
Embodiment 2
The potent mixing arrangement of a kind of urea for medium and small-scale vessel SCR system, as shown in Figure 4, this device comprises body and is arranged on porous slab, urea nozzle 4 and the mixer in body from bottom to top, described rectifying device is the porous slab 3 being distributed with multiple circular hole, described disturbing flow device is mixer 5, mixer is fixed with 4 in criss-cross fin, fin is staggered to form by two panels flat board.Porous slab is arranged on 200cm place, urea nozzle upstream, and mixer is arranged on 300cm place, urea nozzle downstream.Porous slab, urea nozzle, mixer are arranged in pipeline successively along flow of flue gas direction.Body is welded with the adpting flange 1 for being connected with SCR system.
The structure of porous slab is shown in Fig. 1, and porous slab is made up of the circular steel plate of one piece of diameter 300mm, thick 8mm.Plate is dispersed with circular hole 6 according to certain rules: circular hole is centrosymmetric distribution on porous slab, circular hole center of circle interval 22mm; The center of porous slab is first circular hole, and along porous slab radial direction from the inside to surface, the center of circle of each layer circular hole is on a series of concentric circle; Circularhole diameter is 16mm.
The structure of mixer is as Fig. 2 and Fig. 3, and mixer main body is Stainless Steel Tube, is provided with support frame in Stainless Steel Tube, and support frame is fixed with fin, and fin is centrosymmetric distribution in Stainless Steel Tube.Support frame is made up of two mutually perpendicular long steel bars 7 and the 4 short steel bars 8 be fixed on long steel bar, long steel bar is arranged along the diametric(al) of Stainless Steel Tube, the point of intersection of two long steel bars is the center of circle of Stainless Steel Tube, and short steel bar to be vertically fixed on a long steel bar and to parallel with the long steel bar of another root; 4 short steel bars are centrosymmetric distribution diametrically.The length of Stainless Steel Tube is 45mm, and long steel bar diameter is 5mm, length is 300mm, and short steel bar and parallel long steel bar are at a distance of 54mm.
The circular cross-section of mixer is divided into four sectors by support frame.Fix a short steel bar respectively at four sector regions, each short steel bar welds and intersects by the steel disc 990 ° of two pieces the fin formed, every sheet steel disc and flue cross section are 45 ° of angles.The long 120mm of steel disc, wide 40mm, thick 1.0mm.
Porous slab 3, urea nozzle 4, mixer 5 are arranged in pipeline successively along flow of flue gas direction.Porous slab is arranged on nozzle upstream about 200-340cm place, and mixer is arranged on about 300-500cm place, nozzle downstream, as shown in Figure 4.
Be arranged in certain boats and ships exhaust duct for the potent mixing arrangement of the urea shown in Fig. 5, the below of the potent mixing arrangement of urea enters pipeline with flue gas and is connected, and the top of the potent mixing arrangement of urea is connected with SCR catalyst 10.Flue gas stream enters from pipeline opening, forms preliminary disturbance after porous slab, is formed evenly and has the flow field of certain strength of turbulence, ensure that urea spraying mixes comparatively fully with flue gas under various operating mode in urea nozzle place.Mixed flue gas flows through mixer afterwards, and disturbance is strengthened further.The resolution ratio of urea improves, decomposition product NH
3mix with flue gas more abundant, form flue gas flow rate and NH in the ingress of SCR catalyst 10
3the flow field of/NO even concentration.After tested, this device effectively can improve the denitration efficiency of boats and ships SCR system, and time optimum, denitration efficiency reaches more than 95%.Reduce waste and the escaping of ammonia rate of urea liquid.
Above-described embodiment is one of the present invention preferably scheme, not does any pro forma restriction to the present invention, also has other variant and remodeling under the prerequisite not exceeding the technological scheme described in claim.
Claims (10)
1. the potent mixing arrangement of the urea for medium and small-scale vessel SCR system, it is characterized in that: this device comprises body and is arranged on rectifying device, urea nozzle and the disturbing flow device in body from bottom to top, described rectifying device is the porous slab being distributed with multiple circular hole, described disturbing flow device is mixer, mixer being fixed with several is criss-cross fin, and fin is staggered to form by two panels flat board.
2. the potent mixing arrangement of the urea for medium and small-scale vessel SCR system according to claim 1, it is characterized in that: porous slab is arranged on 200cm-340cm place, urea nozzle upstream, mixer is arranged on 300cm-500cm place, urea nozzle downstream.
3. the potent mixing arrangement of the urea for medium and small-scale vessel SCR system according to claim 1, is characterized in that: porous slab is diameter is 300mm-330mm, and thick is the circular corrosion resistant plate of 4mm-8mm.
4. the potent mixing arrangement of the urea for medium and small-scale vessel SCR system according to claim 1, is characterized in that: described circular hole is centrosymmetric distribution on porous slab, and the center of circle of each circular hole is spaced apart 22mm-26mm; Along porous slab radial direction from the inside to surface, the center of circle of each layer circular hole is on a series of concentric circle; Circularhole diameter is 16mm-20mm.
5. the potent mixing arrangement of the urea for medium and small-scale vessel SCR system according to claim 1, is characterized in that: the percent opening of porous slab is 40%-55%.
6. the potent mixing arrangement of the urea for medium and small-scale vessel SCR system according to claim 1, it is characterized in that: mixer main body is Stainless Steel Tube, be provided with support frame in Stainless Steel Tube, support frame is fixed with fin, fin is centrosymmetric distribution in Stainless Steel Tube.
7. the potent mixing arrangement of the urea for medium and small-scale vessel SCR system according to claim 6, it is characterized in that: support frame is made up of two mutually perpendicular long steel bars and the 4 short steel bars be fixed on long steel bar, long steel bar is arranged along the diametric(al) of Stainless Steel Tube, the point of intersection of two long steel bars is the center of circle of Stainless Steel Tube, and short steel bar to be vertically fixed on a long steel bar and to parallel with the long steel bar of another root; 4 short steel bars are centrosymmetric distribution diametrically.
8. the potent mixing arrangement of the urea for medium and small-scale vessel SCR system according to claim 7, it is characterized in that: the length of Stainless Steel Tube is 45mm-55mm, long steel bar diameter is 5mm-8mm, length is 300mm-330mm, and short steel bar and parallel long steel bar are at a distance of 54mm-58mm.
9. the potent mixing arrangement of the urea for medium and small-scale vessel SCR system according to claim 1, is characterized in that: fin is formed by steel disc 90 ° of cross welds of two pieces measure-alike, long 120mm-130mm, wide 40mm-48mm, thick 1.0mm-3.0mm.
10. the potent mixing arrangement of the urea for medium and small-scale vessel SCR system according to claim 8, it is characterized in that: on the mid point of the short steel bar of every root, weld a fin, make the plan range perpendicular to long steel bar at steel disc minor face and corresponding short steel bar place be 42mm-46mm.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107376645A (en) * | 2017-06-14 | 2017-11-24 | 北京福田戴姆勒汽车有限公司 | Exhaust treatment system |
| CN107376644A (en) * | 2017-06-14 | 2017-11-24 | 北京福田戴姆勒汽车有限公司 | The urea mixed-flow structure of exhaust treatment system |
| CN107642395A (en) * | 2016-07-20 | 2018-01-30 | 福特环球技术公司 | Urea blender |
| 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 |
| CN109529622A (en) * | 2019-01-16 | 2019-03-29 | 北京工大环能科技有限公司 | One kind being used for more gas internal-combustion engine flue gas tail portion denitrating systems |
| CN109958512A (en) * | 2017-12-14 | 2019-07-02 | 珀金斯发动机有限公司 | Exhaust-gas treatment system for engine |
| CN111577431A (en) * | 2020-05-11 | 2020-08-25 | 江苏科技大学 | Marine SCR system mixer |
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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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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107642395A (en) * | 2016-07-20 | 2018-01-30 | 福特环球技术公司 | Urea blender |
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| 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 |
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| CN109958512B (en) * | 2017-12-14 | 2022-08-02 | 珀金斯发动机有限公司 | Exhaust treatment system for 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 |
| CN109529622A (en) * | 2019-01-16 | 2019-03-29 | 北京工大环能科技有限公司 | One kind being used for more gas internal-combustion engine flue gas tail portion denitrating systems |
| 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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| CN105464763B (en) | 2018-01-26 |
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