CN100538037C - The Exhaust gas purifying device of motor - Google Patents
The Exhaust gas purifying device of motor Download PDFInfo
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- CN100538037C CN100538037C CNB2005800239312A CN200580023931A CN100538037C CN 100538037 C CN100538037 C CN 100538037C CN B2005800239312 A CNB2005800239312 A CN B2005800239312A CN 200580023931 A CN200580023931 A CN 200580023931A CN 100538037 C CN100538037 C CN 100538037C
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- exhaust
- outlet pipe
- gyration airflow
- mentioned
- urea
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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
- F01N3/24—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 constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
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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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
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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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/08—Other arrangements or adaptations of exhaust conduits
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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
- F01N3/105—General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
- F01N3/106—Auxiliary oxidation catalysts
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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]
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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
- F01N3/24—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 constructional aspects of converting apparatus
- F01N3/36—Arrangements for supply of additional fuel
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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
- F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
- F01N2240/20—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a flow director or deflector
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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
- F01N2470/00—Structure or shape of gas passages, pipes or tubes
- F01N2470/30—Tubes with restrictions, i.e. venturi or the like, e.g. for sucking air or measuring mass flow
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
Be positioned on the outlet pipe (2) of motor (1), comprise NOx reducing catalyst (4) by the nitrogen oxide in the aqueous solution of urea reduction purifying exhaust gas; Spray the nozzle (5) of aqueous solution of urea in the exhaust-gas upstream side of the above-mentioned NOx reducing catalyst (4) of above-mentioned outlet pipe (2); Be positioned at exhaust-gas upstream side that this nozzle (5) sprays the position of aqueous solution of urea, make that exhaust is the blade (11) that the center produces the gyration airflow that helical circles round with the axle center of outlet pipe (2a).By this kind structure, before spray supplying with aqueous solution of urea, produce gyration airflow in the exhaust in advance, therefore can promote mixing of aqueous solution of urea and exhaust.Therefore, promote aqueous solution of urea add water decomposition in, exhaust is mixed equably with the ammonia that aqueous solution of urea generates, and therefore can make in the exhaust inflow NOx reducing catalyst (4) that evenly is mixed with ammonia.
Description
Technical field
The present invention relates to a kind of nitrogen oxide (NO that uses reducing agent to reduce to remove in the exhaust
x) the Exhaust gas purifying device of motor, at length, relate to a kind of gyration airflow generating means that in exhaust passageway, is provided with, make exhaust produce gyration airflow, improve the engine exhaust emission control device of the purification efficiency of exhaust with this.
Background technique
As removing NO contained in the engine exhaust
xThe catalyzer cleaning system, past people has proposed Exhaust gas purifying device.In this Exhaust gas purifying device, in the exhaust passageway of motor, NO is set
xReducing catalyst is by from being arranged on NO
xReducing agents such as the nozzle ejection aqueous solution of urea of the exhaust-gas upstream side of reducing catalyst make exhaust mix with reducing agent, use NO
xReducing catalyst makes the NO in the exhaust
xProduce catalytic reduction reaction with reducing agent, thereby with NO
xPurified treatment is harmless composition (for example, with reference to a patent documentation 1).
Patent documentation 1: the spy opens the 2001-20724 communique
Summary of the invention
But, in this traditional Exhaust gas purifying device, at NO
xDuring the exhaust-gas upstream side injection reduction agent of reducing catalyst, there is the anxiety of the undercompounding of reducing agent and exhaust.If the undercompounding of reducing agent and exhaust, reducing agent can flow into NO unevenly
xReducing catalyst, so the purification efficiency of exhaust may reduce.
Therefore, in view of above-mentioned prior art problems point, the purpose of this invention is to provide a kind of Exhaust gas purifying device of motor, it makes and produces gyration airflow in the exhaust by the gyration airflow generating means is set in exhaust passageway, thereby improves the purification efficiency of exhaust.
In order to reach above-mentioned purpose, the formation of the engine exhaust emission control device of (1) first invention includes: be equipped on the exhaust passageway of motor, utilize the reducing catalyst of the nitrogen oxide in the reducing agent reduction purifying exhaust gas; The exhaust-gas upstream side of above-mentioned reducing catalyst is sprayed the nozzle of supplying with reducing agent in above-mentioned exhaust passageway; Be arranged on said nozzle reducing agent eject position exhaust-gas upstream side, to make exhaust produce axle center with above-mentioned exhaust passageway be the gyration airflow generating means that the gyration airflow that helical circles round is carried out at the center.
(2) in addition, above-mentioned gyration airflow generating means is made of the circulating direction of relative exhaust, a plurality of blades that are positioned on the above-mentioned exhaust passageway that extend along predetermined angular.
(3) in addition, above-mentioned blade pass is crossed and is roughly being cut joint-cutting on the thin plate of same shape with the cross section of above-mentioned exhaust passageway and pull-up forms.
(4) in addition, above-mentioned blade is arranged at one of them side of the inner peripheral surface of the outer circumferential face of the said nozzle that extends to the exhaust downstream side along the roughly axle center of above-mentioned exhaust passageway and above-mentioned exhaust passageway.
(5) in addition, above-mentioned exhaust passageway forms in the exhaust-gas upstream side of said nozzle and can cut apart with the face vertical with air-flow, and above-mentioned blade pass is crossed will being clipped on and cut joint-cutting and pull-up cutting apart of the exhaust passageway that will cut apart on the pad between the interconnected flange in place and form.
(6) in addition, the diameter of above-mentioned reducing catalyst is bigger than the diameter of the cross section of the above-mentioned exhaust passageway of its exhaust-gas upstream side, above-mentioned exhaust passageway forms, and is flowing to the exhaust inflow portion of above-mentioned reducing catalyst, and its end is towards exhaust downstream side flare enlarged-diameter.
(7) in addition, the diameter of above-mentioned reducing catalyst is bigger than the diameter of the cross section of the above-mentioned exhaust passageway of its exhaust-gas upstream side, above-mentioned exhaust passageway forms, and the part between said nozzle and above-mentioned reducing catalyst is the general conical enlarged-diameter towards the exhaust downstream side at least.
The formation of Exhaust gas purifying device of the motors of (8) second inventions possesses and has: the reducing catalyst that be equipped on the exhaust passageway of motor, utilizes reducing agent that the reduction of the nitrogen oxide in the exhaust is purified; In above-mentioned exhaust passageway, spray the nozzle of supplying with reducing agent in the exhaust-gas upstream side of above-mentioned reducing catalyst; Be equipped on the exhaust-gas upstream side of said nozzle and traverse the dividing plate of above-mentioned exhaust passageway, the central part of described dividing plate has the gyration airflow generating means that the exhaust of order by this exhaust passageway produces the gyration airflow that helical circles round, and the neighboring area of this gyration airflow generating means point-like of loosing is formed with and makes the exhaust exhaust port that goes out of effluent downstream; Constitute the connection outlet pipe of an above-mentioned exhaust passageway part, described connection outlet pipe includes above-mentioned gyration airflow generating means and engages with aforementioned barriers in inside, on above-mentioned gyration airflow generating means side nearby, be formed with the exhaust that the exhaust port from dividing plate is flowed out and introduce inner exhaust introduction hole.
(9) the gyration airflow generating means of aforementioned barriers is to be made of several blades, this blade is that broken line cuts many joint-cuttings with the limit that relative aforementioned barriers central part is radial extension, thereby becomes the predetermined angular bending to make exhaust produce the gyration airflow that helical is circled round to the exhaust downstream side its outer end.
(10) in addition, the exhaust introduction hole of above-mentioned connection outlet pipe forms like this, and its exhaust-gas upstream side edge part is positioned at exhaust-gas upstream side than the blade front end of above-mentioned gyration airflow generating means.
The invention that relates to according to above-mentioned (1), by the gyration airflow generating means, the axle center that can make the exhaust of motor produce with exhaust passageway is that the gyration airflow that helical is circled round is carried out at the center.Supply with reducing agent because nozzle sprays to the exhaust that produces this gyration airflow, therefore can promote mixing of reducing agent and exhaust.In view of the above, flowed into reducing catalyst owing to roughly be mixed with the exhaust of reducing agent equably, thereby can improve the exhaust gas purification efficient in the reducing catalyst.
In addition, because the gyration airflow generating means is positioned at the exhaust-gas upstream side of the position of nozzle ejection reducing agent, so the reducing agent of supply that nozzle sprays can be attached on the gyration airflow generating means.Therefore, on the gyration airflow generating means, can not separate out the composition of reducing agent.
In addition, the invention according to above-mentioned (2) relate to by making exhaust along the blade pass mistake, can change the circulating direction of exhaust, makes exhaust produce gyration airflow.
According to above-mentioned (3～5) any related invention, can easily form blade.Particularly, only need to change pad, just can easily make exhaust produce gyration airflow according to above-mentioned (5) related invention.
In addition, according to the invention that above-mentioned (6) relate to, producing has the inner peripheral surface of the exhaust meeting of gyration airflow along the exhaust passageway of flare enlarged-diameter, flows into the diameter reducing catalyst big than the cross section of the exhaust passageway of exhaust-gas upstream side while spreading.In view of the above, because reducing catalyst is spread, roughly flows into equably in the exhaust meeting rapidly, therefore can improve the exhaust gas purification efficient of reducing catalyst.
According to above-mentioned (7) related invention, the exhaust that produces gyration airflow is when the part between nozzle and the reducing catalyst is the exhaust passageway of general conical enlarged-diameter at least, on one side the inner peripheral surface along exhaust passageway circles round, on one side to the radially foreign side diffusion of exhaust passageway.In view of the above, exhaust is fully diffusion in exhaust passageway, roughly flows into reducing catalyst equably, therefore can improve the exhaust gas purification efficient of reducing catalyst.
According to above-mentioned (8) related invention, traverse the dividing plate central part of exhaust passageway in the exhaust-gas upstream side of nozzle, the gyration airflow generating means is set, make exhaust produce the gyration airflow that shape in the shape of a spiral circles round, exhaust port is set in the neighboring area of the gyration airflow generating means of dividing plate with loosing point-like, in the side of the connection outlet pipe that constitutes an exhaust passageway part exhaust introduction hole is set simultaneously, by above-mentioned exhaust port and exhaust introduction hole with a part of exhaust introduce above-mentioned gyration airflow generating means near, in view of the above, gyration airflow by above-mentioned exhaust can promote the reducing agent of supply that nozzle sprays and mixing of exhaust, improve exhaust gas purification efficient, suppress exhaust and concentrate in the gyration airflow generating means, reduce exhaust resistance.
In addition, according to above-mentioned (9) related invention, on dividing plate, the limit that is radial extension with relative its central part is that broken line cuts many joint-cuttings, become predetermined angular bending back to form a plurality of blades to the exhaust downstream side outer end, thereby can make exhaust produce the gyration airflow that helical is circled round by simple structure.
According to above-mentioned (10) related invention, the exhaust introduction hole of above-mentioned connection outlet pipe is formed, make this exhaust-gas upstream side edge part be positioned at exhaust-gas upstream side than the blade front end of gyration airflow generating means, can keep the gyration airflow of exhaust thus.Therefore, can further promote the mixing of reducing agent and exhaust, improve the purification efficiency of exhaust.
Description of drawings
Fig. 1 is the summary pie graph of first example of Exhaust gas purifying device of the motor of first invention.
Fig. 2 is the stereogram of formation example that is applicable to the dividing plate of above-mentioned example.
Fig. 3 shows outlet pipe in the above-mentioned example and the blast air the space in, and (a) explanatory drawing when dividing plate is not set (b) is explanatory drawing when dividing plate is set.
Fig. 4 is the tectonic maps that shows another embodiment of blade shape.
Fig. 5 is the tectonic maps that shows the another embodiment of blade shape, (a) is plan view, (b) is profile.
Fig. 6 is other embodiment's the tectonic maps that shows the outlet pipe shape.
Fig. 7 is the summary pie graph of second example that shows the Exhaust gas purifying device of above-mentioned motor.
Fig. 8 is the stereogram of structure example that is applicable to the pad of above-mentioned example.
Fig. 9 is the summary pie graph of example of Exhaust gas purifying device that shows the motor of second invention.
Figure 10 is the plan view of formation example that is applicable to the dividing plate of above-mentioned example.
Figure 11 is the sectional view of the housing parts of the expansion oxidation catalyst under the above-mentioned example.
Figure 12 is the explanatory drawing of the position relation between the exhaust-gas upstream side edge part of blade front end under the above-mentioned example and exhaust introduction hole.
Figure 13 is in each position relation of Figure 12, and the explanatory drawing of the disperse state of the aqueous solution of urea of supply that nozzle sprays (a) be the situation that the position of Figure 12 (a) concerns, (b) is the situation that the position of Figure 12 (b) concerns.
The explanation of symbol
1...... motor
2...... outlet pipe (exhaust passageway)
2a...... outlet pipe (connection outlet pipe)
2b...... end
4......NO
xReducing catalyst (reducing catalyst)
5...... nozzle
5a...... spray orifice
10...... dividing plate
11,12,13...... blade (gyration airflow generating means)
11d...... the front end of blade
14...... flange
15...... pad
17...... exhaust port
18...... exhaust introduction hole
18a...... the edge part of exhaust-gas upstream side
Embodiment
Below with reference to the accompanying drawings, describe example of the present invention in detail.
Figure 1 shows that the summary pie graph of first example of Exhaust gas purifying device of the motor of first invention.This Exhaust gas purifying device utilizes reducing agent reduction to remove nitrogen oxide (NO in the exhaust
x), its formation includes: be provided on the exhaust passageway of motor, utilize the reducing catalyst of the nitrogen oxide in the reducing agent reduction purifying exhaust gas; In above-mentioned exhaust passageway, in the exhaust-gas upstream side of above-mentioned reducing catalyst, spray the nozzle of supply reducing agent; Be arranged on the position of said nozzle injection reduction agent exhaust-gas upstream side, make that exhaust is that central helical ground produces the gyration airflow generating means that circles round with the axle center of above-mentioned exhaust passageway.
The exhaust passageway of motor 1 is on the outlet pipe 2, is followed successively by from exhaust-gas upstream side: with the oxidation of nitric oxide the exhaust be the oxidation catalyst 3 of nitrogen dioxide, with NO
xThe NO that reduction purifies
xReducing catalyst 4.In addition, at oxidation catalyst 3 and NO
xOn the outlet pipe 2a between the reducing catalyst 4, be provided with the aqueous solution of urea as reducing agent is sprayed the nozzle of supplying with 5 in outlet pipe 2a.Nozzle 5 is supplied with aqueous solution of urea according to engine operating status.In addition, though use aqueous solution of urea in this example, can also use ammonia spirit as reducing agent, with hydrocarbon as the light oil of primary coil etc.
NO
xIn the reducing catalyst 4, in the shell 6 that forms diameter big roughly round barrel shape, be built-in with the catalyst carrier 7 that appendix for example has the zeolites active component than outlet pipe 2a.Catalyst carrier 7 be set to and the exhaust-gas upstream side end 6a of shell 6 between separate the 1st predetermined distance L1.Thereby the inside of shell 6 is formed with space 8 in the exhaust-gas upstream side of catalyst carrier 7.Approximate center at the exhaust-gas upstream side end of shell 6 6a is inserted with outlet pipe 2a, and its upper shed has the end 2b as exhaust inflow portion.Outlet pipe 2a is arranged so that and separates the 2nd predetermined distance L2 between end 2b and the catalyst carrier 7, simultaneously, is fixed on the shell 6 by fixed plate 9 near the 2b of end.In addition, the inner peripheral surface of end 2b enlarges towards exhaust downstream side flare in space 8.In addition, the 2nd predetermined distance L2 can set aptly according to the specification of motor 1, the internal diameter of outlet pipe 2a, the internal diameter of shell 6 etc.As long as the 1st predetermined distance L1 is wide than the 2nd predetermined distance L2, makes the end 2b of the flare shell 6 of packing into get final product.
Among the outlet pipe 2a,, be provided with that to make exhaust produce axle center with outlet pipe 2a be center, the gyration airflow generating means of the gyration airflow that circles round of shape in the shape of a spiral in the exhaust-gas upstream side of nozzle 5.As shown in Figure 2, on the aforementioned barriers 10, by will with the cross section of outlet pipe 2a roughly the thin plate of same shape cut joint-cutting and pull-up, form with respect to the circulating direction of exhaust with predetermined angular extend, as a plurality of blades 11 of gyration airflow generating means.Piece number of blade 11 and angle etc. can be set aptly according to the specification of motor 1, the internal diameter of outlet pipe 2a, the internal diameter of shell 6 etc.
According to above-mentioned structure, the exhaust of motor 1 by blade 11, produces axle center with outlet pipe 2a and is the center gyration airflow that circles round of shape in the shape of a spiral.Afterwards, nozzle 5 sprays the aqueous solution of urea of supplying with the amount that the operating condition with motor 1 adapts in the exhaust that has produced this gyration airflow.Under the effect of the water vapour of aqueous solution of urea exhaust heat and exhaust that ejects from nozzle 5, add water decomposition and generate ammonia.Ammonia flows into NO with exhaust while mixing
xIn the reducing catalyst 4.Like this, at NO
xIn the reducing catalyst 4, the NO in ammonia and the exhaust
xReaction, thereby with the NO in the exhaust
xPurify and be water and harmless gas.
At this moment, the exhaust of motor 1 is by oxidation catalyst 3, and the oxidation of nitric oxide in the exhaust becomes nitrogen dioxide thus.In view of the above, the nitric oxide production ratio in the exhaust reduces, and the nitrous oxide in the exhaust and the ratio of nitrogen dioxide are near NO
xTherefore the optimal proportion that purifies in the reducing catalyst can improve NO
xThe purification efficiency of the exhaust in the reducing catalyst 4.
In addition, owing to be to utilize dividing plate 10 and blade 11 to make exhaust produce gyration airflow, aqueous solution of urea is injected to supply in the exhaust that has produced this kind gyration airflow, therefore promotes the mixing of aqueous solution of urea and exhaust.In view of the above, promote aqueous solution of urea add water decomposition in, exhaust also roughly mixes equably with the ammonia that aqueous solution of urea is generated.In addition, because the end 2b flare of outlet pipe 2a enlarges,, in space 8, spread rapidly while the exhaust meeting that has therefore produced gyration airflow is spread in end 2b inflow space 8 along the inner peripheral surface of flaring outlet pipe 2a.In view of the above, the exhaust that roughly is mixed with ammonia equably roughly flows into NO equably
xIn the catalyst carrier 7 of reducing catalyst 4, therefore can improve NO
xThe purification efficiency of the exhaust in the reducing catalyst 4.
In addition, because dividing plate 10 is positioned at the exhaust upstream of nozzle 5, so can not adhere to the aqueous solution of urea that nozzle 5 is ejected on the dividing plate 10.Thereby composition---urea that can the precipitated urea aqueous solution on the dividing plate 10.
Fig. 3 is that forming tubaeform with end 2b is prerequisite, has simulated in the outlet pipe 2a and the diagram of the exhaust airstream in the space 8.Shown in Fig. 3 (a) is the exhaust upstream of nozzle 5 exhaust airstream when dividing plate 10 is not set, and shown in Fig. 3 (b) is the exhaust provided upstream of nozzle 5 exhaust airstream when being equipped with dividing plate 10.Therefore can distinguish that forming tubaeform with end 2b is prerequisite, when dividing plate 10 was set, exhaust is more diffusion in space 8, more roughly equably in the inflow catalyst carrier 7.
In addition, also can replace being provided with dividing plate 10, as shown in Figure 4, outer circumferential face at the nozzle 5 that extends to the exhaust downstream side along the roughly axle center of outlet pipe 2a, in exhaust upstream one side of the spray orifice 5a that sprays aqueous solution of urea, a plurality of blades 12 that the circulating direction with respect to exhaust extends with predetermined angular are set as the gyration airflow generating means.In addition, as shown in Figure 5, also can be in the exhaust-gas upstream side of spray orifice 5a, at the inner peripheral surface of outlet pipe 2a, a plurality of blades 13 that the circulating direction with respect to exhaust extends with predetermined angular are set as the gyration airflow generating means.In view of the above, identical with above-mentioned dividing plate 10 and blade 11, before spraying the supply aqueous solution of urea, exhaust has produced gyration airflow in advance, therefore can bring into play same effect.In addition, by to the outer circumferential face of the nozzle 5 of exhaust downstream side extension blade 12 being set in roughly axle center along outlet pipe 2a, simultaneously the inner peripheral surface at outlet pipe 2a is provided with blade 13, can produce stronger gyration airflow, further promotes mixing of aqueous solution of urea and exhaust.
In addition, as shown in Figure 6, also can be set to by outlet pipe 2a, at dividing plate 10 and NO
xBetween the reducing catalyst 4, be general conical towards the exhaust downstream side and enlarge, until with NO
xThe diameter of reducing catalyst 4 about equally.The exhaust that produces gyration airflow can be along the inner peripheral surface of outlet pipe 2a when the outlet pipe 2a by tapered expansion, while the radially foreign side of circling round to outlet pipe 2a spreads.In view of the above, owing to exhaust fully diffusion in outlet pipe 2a, roughly equably in the inflow catalyst carrier 7, therefore can improve NO
xThe purification efficiency of the exhaust in the reducing catalyst 4.At this moment, if make outlet pipe 2a at least at nozzle 5 and NO
xPart zone between the reducing catalyst 4 is general conical and enlarges towards the exhaust downstream side, also can bring into play same effect.In addition, make outlet pipe 2a at least at nozzle 5 and NO
xWhen the part zone between the reducing catalyst 4 is general conical expansion towards the exhaust downstream side,, also can bring into play same effect with one of them replaces dividing plate 10 at least in blade 12 and the blade 13.
In addition, if such formation, promptly as shown in Figure 7, outlet pipe 2a between oxidation catalyst 3 and the nozzle 5 can be cut apart with the face vertical with the air-flow of exhaust, and the outlet pipe 2a that utilizes flange 14 to cut apart is connected to each other, and at this moment, can form blade 11 on the pad 15 that is clipped on 14 of flanges.At this moment, for example as shown in Figure 8, when forming pad 15, can utilize the plectane part at the center of being got through as exhaust passageway, on pad 15, cut joint-cutting and pull-up, form the blade 11 of the circulating direction of a plurality of relative exhausts with the angle extension of regulation.In view of the above, identical with dividing plate 10, can before spraying aqueous solution of urea, make exhaust produce gyration airflow in advance.Therefore, divided outlet pipe 2a only need change pad 15 by in the flange 14 interconnected structures between oxidation catalyst 3 and nozzle 5, need not to change other parts and can easily bring into play and as shown in Figure 1 the identical effect of dividing plate 10.
The Exhaust gas purifying device of the motor of second invention then, is described with reference to Fig. 9～Figure 13.Fig. 9 is the summary pie graph of example of Exhaust gas purifying device of the motor of this invention.The formation of this Exhaust gas purifying device possesses and has: the reducing catalyst that is equipped on the exhaust passageway of motor, utilizes reducing agent that the reduction of the nitrogen oxide in the exhaust is purified; In above-mentioned exhaust passageway, spray the nozzle of supplying with reducing agent in the exhaust-gas upstream side of above-mentioned reducing catalyst; Be equipped on the exhaust-gas upstream side of said nozzle and traverse the dividing plate of above-mentioned exhaust passageway, its central part has the gyration airflow generating means that the exhaust of order by this exhaust passageway produces the gyration airflow that helical circles round, and the point-like ground that looses, the neighboring area of this gyration airflow generating means is formed with and makes the exhaust exhaust port that goes out of effluent downstream; Constitute the connection outlet pipe of an above-mentioned exhaust passageway part, its inside includes above-mentioned gyration airflow generating means and engages with aforementioned barriers, on above-mentioned gyration airflow generating means side nearby, be formed with the exhaust that the exhaust port from described dividing plate is flowed out and introduce inner exhaust introduction hole.
Generally speaking, be that the exhaust of the motor 1 of fuel is discharged in the atmosphere via the outlet pipe 2 as exhaust passageway with gasoline or light oil.At length, in the above-mentioned outlet pipe 2 from exhaust-gas upstream side be disposed with the oxidation catalyst 3 of nitrous oxide (NO), as the NOx reducing catalyst 4 of reducing catalyst.
Above-mentioned oxidation catalyst 3 is to generate NO with the oxidation reaction oxidation by the NO in the exhaust in the outlet pipe 2
2Set up honeycomb type catalyst, this honeycomb type catalyst for example is to constitute, have on integrated (monolith) catalyst carrier of cellular cross section at the material by heat resistances such as the steinheilite (Japanese: コ-デ イ ラ イ ト) of pottery and stainless steel, excellent corrosion resistance, is carried with precious metals such as platinum on the surface of porous materials such as aluminium oxide.Above-mentioned oxidation catalyst 3, contact on one side with catalyzer in the catalyzer shell on one side by the exhaust in the above-mentioned outlet pipe 2 and to flow in the shell 16 roughly cylindraceous big than outlet pipe 2 diameters by income, makes the NO generation oxidation reaction (burning) in the exhaust become NO
2Thereby, improve the NO in downstream side
xNO in the reducing catalyst 4
xThe rate of removing.In addition, when oxidation reaction took place above-mentioned NO, the hydrocarbon in the exhaust (HC), carbon monoxide (CO) etc. also reduced by oxidation reaction.
In addition, in the above-mentioned shell 16, be equipped with the internal diameter circular dividing plate 10 about equally of profile and shell in the exhaust downstream side, it traverses above-mentioned shell 16, has connected and NO is housed
xConnection outlet pipe 2a that the shell 6 of reducing catalyst 4 is connected has been communicated with the space 16a, 8 in two shells 16,6, has guaranteed the path of exhaust.On this dividing plate 10, as shown in figure 10, its central part is formed with a plurality of blades 11 as the gyration airflow generating means (showing 4 among Figure 10), they make, and exhaust is that the center produces spiral helicine gyration airflow with the axle center that connects outlet pipe 2a, and the neighboring area of blade 11 is formed with exhaust port 17 with loosing point-like.In addition, above-mentioned blade 11 as shown in figure 10, with the limit 11a that vertically extends with respect to aforementioned barriers 10 central parts is broken line, cut the joint-cutting 11b that roughly colludes shape, as shown in figure 11, make its outer end 11c be the predetermined angular bending, form roughly propeller-type, make exhaust produce gyration airflow to exhaust downstream side (in shown in the arrow A) with figure.The quantity of this blade 11 can be according to the settings aptly such as internal diameter of the specification of motor 1, the internal diameter that is connected outlet pipe 2a or shell 16 with angle.
In addition, on the side of above-mentioned connection outlet pipe 2a, as shown in figure 11, be formed with exhaust introduction hole 18 near the front end 11d of above-mentioned blade 11, the exhaust of flowing out from the exhaust port 17 of dividing plate 10 can be introduced in connection outlet pipe 2a near the front end 11d of above-mentioned blade 11 by above-mentioned exhaust introduction hole 18.This exhaust introduction hole 18 is preferably shown in Figure 12 (a), and its exhaust-gas upstream side edge part 18a is positioned at exhaust-gas upstream side than the front end 11d of above-mentioned blade 11.
The NO that is connected with the shell 16 of above-mentioned oxidation catalyst 3 by connecting outlet pipe 2a
xIn the shell 6 of reducing catalyst NO is housed
xReducing catalyst 4.This NO
xReducing catalyst 4 will be by the NO in the exhaust in the outlet pipe 2
xReduce purification with reducing agent, for example, on integrated (monolith) catalyst carrier of the cellular cross section that the refractory steel of steinheilite with pottery and Fe-Cr-AI system constitutes, appendix has the active component of zeolites.After running into reducing agent, the active component of catalyst carrier institute load is activated above-mentioned NO
xReducing catalyst 4 thereby can be with the NO in the exhaust
xPurify effectively and be innoxious substance.In addition, 6 one-tenth on above-mentioned shell is roughly cylindric, and its diameter is bigger than outlet pipe 2.
In addition, in the above-mentioned shell 6, at NO
xThe exhaust-gas upstream side of reducing catalyst possesses the internal diameter circular fixed plate 9 about equally that has with shell 6, it traverses above-mentioned shell 6, central part is formed with opening portion, is fixed with on this opening portion with the shell 16 of above-mentioned oxidation catalyst 3 is connected to be connected outlet pipe 2a.This connects end 2b (arrow A direction) flare expansion towards the exhaust downstream side of outlet pipe 2a.
In addition, at above-mentioned NO
xThe back segment of reducing catalyst 4 is provided with deamination oxidation catalyst in abridged in the diagram, can be with NO
xThe ammonia that reducing catalyst can not be handled carries out oxidation processes, discharges after the odorlessization.
In addition, the NO of above-mentioned connection outlet pipe 2a inside
xThe upstream side of reducing catalyst 4 is equipped with nozzle 5, and diagram abridged reducer feeding device is spurted into reducing agent jointly with pressure gas by nozzle 5 and is connected in the outlet pipe 2a.Here, the front end position of nozzle 5 and the circulating direction of exhaust (direction of arrow A) almost parallel ground side downstream extend, but also can give prominence to the circulating direction of exhaust in connecting outlet pipe 2a with being approximate right angle.
Then, the work to the Exhaust gas purifying device of the motor of structure like this describes.
Motor 1 starts the exhaust of discharging the back and flows into oxidation catalyst 3 via outlet pipe 2, and by this oxidation catalyst 3, the NO in the exhaust is oxidized to NO through oxidation reaction
2Contain this NO
2The blade 11 of exhaust by the dividing plate in the shell 16 circle round, in connecting outlet pipe 2a, flow after becoming gyration airflow along the arrow A direction.
Simultaneously, nozzle 5 sprays the supply aqueous solution of urea to the arrow A direction in connecting outlet pipe 2a.Nozzle 5 sprays the aqueous solution of urea of supplying with and adds water decomposition generation ammonia by the water vapour in exhaust heat and the exhaust.Ammonia and exhaust mix on one side, Yi Bian flow into NO
xReducing catalyst 4.Like this, at NO
xIn the reducing catalyst 4, the NO in ammonia and the exhaust
xReaction, thereby with the NO in the exhaust
xPurify and be water and harmless gas.
At this moment, supply in the gyration airflow of exhaust, therefore promoted the mixing of aqueous solution of urea and exhaust because aqueous solution of urea sprays.Thereby in the time of the adding water decomposition and obtain promoting of aqueous solution of urea, the ammonia that exhaust and aqueous solution of urea are generated also roughly obtains mixing equably.In addition, enlarge, so the exhaust of gyration airflow one side is along the inwall diffusion of the end 2b of the connection outlet pipe 2a of flue expansion, on one side from the NO of end 2b in shell 6 owing to connect the end 2b flue of outlet pipe 2a
xDiffusion rapidly in the upstream side space 8 of reducing catalyst.In view of the above, roughly evenly flow into NO by the exhaust that roughly evenly is mixed with ammonia
xReducing catalyst 4 has further promoted the catharsis of the exhaust of NOx reducing catalyst 4.
In addition, the part of the exhaust of flowing out from above-mentioned oxidation catalyst 3 flows into the space 16c that this dividing plate 10 and above-mentioned shell 16 side 16b are constituted from the exhaust port 17 on the dividing plate shown in Figure 11 10, and then, be introduced near the blade 11 front end 11d the connection outlet pipe 2a from being formed at the exhaust introduction hole 18 that connects outlet pipe 2a side.Like this, exhaust does not concentrate on above-mentioned blade 11, and wherein a part disperses to flow out from above-mentioned exhaust port 17, and flows in the connection outlet pipe 2a from exhaust introduction hole 18, has therefore reduced exhaust resistance.
At this moment, shown in Figure 12 (a), because the edge part 18a of the exhaust-gas upstream side of exhaust introduction hole 18 is positioned at the position of upstream side more than the front end 11d of blade 11, so the exhaust that can not introduce because of above-mentioned exhaust introduction hole 18 of the gyration airflow of the exhaust that blade 11 produced and not upsetting.(a) of Figure 13 is that the position of Figure 12 (a) concerns the embodiment under the situation, and the interval delta a of the edge part 18a of the front end 11d of blade 11 and the exhaust-gas upstream side of exhaust introduction hole 18 is-2.5mm.Like this, the gyration airflow of exhaust is maintained, and the aqueous solution of urea extensive diffusive that nozzle 5 is sprayed roughly flows into NO equably
xIn the reducing catalyst 4.
On the other hand, shown in Figure 12 (b), the edge part 18a of the exhaust-gas upstream side of exhaust introduction hole 18 is positioned at apart from the front end 11d of blade 11 only during the position, exhaust downstream side of Δ b, shown in Figure 13 (b), the gyration airflow of exhaust is deflated the exhaust that introduction hole 18 introduces suppresses, and has suppressed the diffusion of the aqueous solution of urea that nozzle 5 sprayed.In addition, (b) of Figure 13 is that the position of Figure 12 (b) concerns the embodiment under the situation, and above-mentioned Δ b is+13.2mm.Like this, if the edge part 18a of the exhaust-gas upstream side of exhaust introduction hole 18 can keep the gyration airflow of exhaust the front end 11d that is positioned at blade 11 position of upstream side more.
So, Exhaust gas purifying device according to second motor of inventing, central part by the dividing plate 10 that sets at the shell 16 that traverses oxidation catalyst 3 forms blade 11, make exhaust produce the gyration airflow that helical is circled round, the point-like of loosing in the neighboring area of the blade 11 of dividing plate 10 forms exhaust port 17, simultaneously, the side formation exhaust introduction hole 18 that is connected outlet pipe 2a that includes blade 11 in inside and engage with dividing plate, the part of exhaust is introduced near the front end 11d of above-mentioned blade 11 via above-mentioned exhaust port 17 and exhaust introduction hole 18, can be kept the gyration airflow of the exhaust that above-mentioned blade 11 produced and reduce exhaust resistance.Therefore, can be when promoting the mixing of aqueous solution of urea that nozzle 5 is sprayed and exhaust, the diffusion of promotion aqueous solution of urea makes it roughly flow into NO equably
xReducing catalyst 4 improves the purification efficiency of exhaust.
Claims (3)
1. the Exhaust gas purifying device of a motor is characterized in that, the formation of the Exhaust gas purifying device of described motor includes:
The reducing catalyst that is equipped on the exhaust passageway of motor, utilizes reducing agent that the reduction of the nitrogen oxide in the exhaust is purified;
In described exhaust passageway, spray the nozzle of supplying with reducing agent in the exhaust-gas upstream side of described reducing catalyst;
Traverse described exhaust passageway and the dividing plate that sets in the exhaust-gas upstream side of described nozzle, described dividing plate has the gyration airflow generating means that the exhaust of order by this exhaust passageway produces the gyration airflow that shape in the shape of a spiral circles round at central part, and the neighboring area of this gyration airflow generating means point-like of loosing is formed with and makes the exhaust exhaust port that goes out of effluent downstream;
Constitute the connection outlet pipe of a described exhaust passageway part, the inside of described connection outlet pipe includes described gyration airflow generating means and engages with described dividing plate, on described gyration airflow generating means side nearby, be formed with the exhaust that the exhaust port from described dividing plate is flowed out and introduce inner exhaust introduction hole.
2. the Exhaust gas purifying device of motor as claimed in claim 1, it is characterized in that, the gyration airflow generating means of described dividing plate is made of a plurality of blades, described blade forms like this, the limit that is radial extension with described relatively dividing plate central part is that broken line cuts many joint-cuttings, thereby makes its outer end become the predetermined angular bending to make exhaust produce the gyration airflow that helical is circled round to the exhaust downstream side.
3. the Exhaust gas purifying device of motor as claimed in claim 2 is characterized in that, the exhaust introduction hole of described connection outlet pipe forms like this, makes the edge of its exhaust-gas upstream side in the exhaust-gas upstream side of the blade front end of described gyration airflow generating means.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004210353A JP3892452B2 (en) | 2004-07-16 | 2004-07-16 | Engine exhaust purification system |
| JP210353/2004 | 2004-07-16 | ||
| JP251470/2004 | 2004-08-31 |
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| Publication Number | Publication Date |
|---|---|
| CN1985080A CN1985080A (en) | 2007-06-20 |
| CN100538037C true CN100538037C (en) | 2009-09-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005800239312A Active CN100538037C (en) | 2004-07-16 | 2005-07-14 | The Exhaust gas purifying device of motor |
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| JP (1) | JP3892452B2 (en) |
| CN (1) | CN100538037C (en) |
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2004
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2005
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2006029233A (en) | 2006-02-02 |
| CN1985080A (en) | 2007-06-20 |
| JP3892452B2 (en) | 2007-03-14 |
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Effective date of registration: 20220412 Address after: Gothenburg Patentee after: VOLVO TRUCK Corp. Patentee after: Tokyo Roki Co.,Ltd. Address before: Saitama Prefecture, Japan Patentee before: UD Trucks Corp. Patentee before: Tokyo Roki Co.,Ltd. Effective date of registration: 20220412 Address after: Saitama Prefecture, Japan Patentee after: UD Trucks Corp. Patentee after: Tokyo Roki Co.,Ltd. Address before: Japan's Saitama Prefecture Patentee before: Nissan Diesel Motor Co.,Ltd. Patentee before: Tokyo Roki Co.,Ltd. |