CN100414078C - SCR muffler - Google Patents

SCR muffler Download PDF

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Publication number
CN100414078C
CN100414078C CNB2005800038807A CN200580003880A CN100414078C CN 100414078 C CN100414078 C CN 100414078C CN B2005800038807 A CNB2005800038807 A CN B2005800038807A CN 200580003880 A CN200580003880 A CN 200580003880A CN 100414078 C CN100414078 C CN 100414078C
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CN
China
Prior art keywords
reducing agent
plate
outlet pipe
scr
waste gas
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CNB2005800038807A
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Chinese (zh)
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CN1914411A (en
Inventor
白井大辅
山田尚史
平本均
金谷勇
上野弘树
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UD Trucks Corp
Tokyo Roki Co Ltd
Volvo Truck Corp
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UD Trucks Corp
Tokyo Roki Co Ltd
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Application filed by UD Trucks Corp, Tokyo Roki Co Ltd filed Critical UD Trucks Corp
Publication of CN1914411A publication Critical patent/CN1914411A/en
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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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • 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

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  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

An exhaust gas flow through an SCR muffler and the purifying efficiency of nitrogen oxides (NOx) contained in the exhaust gas are improved, and vehicle vibration received by a supplying nozzle for a reducing agent or the like and vibration by the effect of exhaust gas or the like are controlled or eased, whereby the purifying efficiency of nitrogen oxides (NOx) by an SCR catalyst is improved, and the durability of the supplying nozzle for a reducing agent or the like is also improved. The inventive muffler comprises an SCR catalyst (1) for selectively reducing and purifying nitrogen oxides (NOx) contained in the exhaust gas, an exhaust pipe (2) for passing the exhaust gas into the SCR catalyst (1), and supplying means (3) for a reducing agent or the like for supplying a reducing agent or a reducing agent precursor to the exhaust gas, wherein a plate (4) having air holes (5) for dispersing and uniforming an exhaust gas flow is provided on the downstream side of the supplying means (3) and on the upstream side of the SCR catalyst (1), the air holes (5) being not provided at the center that blocks the exhaust pipe (2) but a plurality of circular air holes (5) being disposed in a concentric and staggered forms only at the periphery portion of an area having a diameter larger than that of the drain pipe, and a plate (4) having air holes (5) is inserted into a supplying nozzle (30) for a reducing agent or the like that is a kind of the supplying means (3) for a reducing agent or the like, this plate (4) being supported on the exhaust pipe (2).

Description

The SCR silencing apparatus
The cross reference of related application
It is preference in the Japanese patent application JP2004-26074 and the JP2004-35448 on February 2nd, 2004 and February 12 that the application requires with SEPARATE APPLICATION, and they in this combination as a reference.
Technical field
The present invention relates to the SCR silencing apparatus, its have be used for optionally reducing and scavenging in contained nitrogen oxide (NO X) the SCR catalyzer.
Background technique
In recent years, because for example existence of the environmental pollution problem of acid rain and photochemical smog etc., for contained particulate matter (PM) and nitrogen oxide (NO in the waste gas of discharging by the internal-combustion engine of for example diesel engine X), press for its removing.
Therefore, there is a kind of traditional technology, in the vent systems of internal-combustion engine, the reducing agent or the supply nozzle of reducing agent precursor by reducing agent etc. of urea water for example, be supplied to waste gas from the upstream of the SCR silencing apparatus of SCR (selective catalytic reduction effect) catalyzer through injection with selective reduction, thereby by contained nitrogen oxide (NO in reduction of SCR catalyst selectivity ground and the scavenging X).For example, referring to Japanese Patent Application Publication 2001-20724.
In addition, also have a kind of system, wherein, for example the pore of punching hole is formed in the outlet pipe, disperses exhaust flow and makes it even.For example, referring to the open H02-115912 of Japanese utility model application.
Yet, adopt this conventional art, there is a problem, that is, because the exhaust flow outofkilter is removed nitrogen oxide (NO when short-term operation X) efficient very low, and all very low to the gamut internal efficiency of high temperature at low temperature.
Particularly, with urea water as under the situation of reducing agent precursor, also have a problem, that is, because the exhaust flow outofkilter, urea is deposited in the outlet pipe that is arranged in SCR catalyzer upstream etc., removes nitrogen oxide (NO thereby reduce greatly X) efficient.
In addition, with traditional technology, there is a problem, promptly, because the supply nozzle of reducing agent etc. is subjected to the influence of vibration of vehicle, waste gas and similar vibration member, be difficult to by spray with reducing agent or for example the reducing agent precursor of urea water be supplied to waste gas in homodisperse mode, SCR catalyzer removing nitrogen oxide (NO like this X) efficient very low.
Also have a problem in addition, that is, owing to the vibration that the vibration by vehicle, waste gas and analog causes, it is very low that the supply nozzle of reducing agent etc. faces danger and the serviceability destroying and be out of shape.
Summary of the invention
Therefore, an object of the present invention is to provide a kind of SCR silencing apparatus, it can make that exhaust flow is in shape, thereby improves contained nitrogen oxide (NO in the scavenging X) efficient.
In addition, another object of the present invention provides a kind of SCR silencing apparatus, the vibration that its suffered vibration by vehicle, waste gas and analog of supply nozzle that can suppress or reduce reducing agent etc. causes, thus contained nitrogen oxide (NO in the SCR catalyzer scavenging improved X) efficient and the serviceability of the supply nozzle of reducing agent etc.
The present invention who is used for addressing the above problem is a kind of SCR silencing apparatus, comprising: be used for optionally reducing and the contained nitrogen oxide (NO of scavenging X) the SCR catalyzer; Allow waste gas to flow into the outlet pipe of SCR catalyzer; And the supplier that reducing agent or reducing agent precursor is supplied to the reducing agent etc. of waste gas.This SCR silencing apparatus is characterised in that having the plate that disperses exhaust flow and make its uniform pore is arranged on the supplier downstream of reducing agent etc. and the upstream of SCR catalyzer.
SCR silencing apparatus feature of the present invention is that also above-mentioned plate is connected in an end of outlet pipe and diameter greater than outlet pipe, and above-mentioned pore only is arranged in the zone of diameter greater than outlet pipe.
This plate can have shape as the cross section of tapered convex surface upstream.
Another kind of scheme of the present invention is a kind of SCR silencing apparatus, comprises being used for optionally reducing and the contained nitrogen oxide (NO of scavenging X) the SCR catalyzer; Allow waste gas to flow into the SCR catalyzer and in it will be inserted into the part of silencing apparatus, have the outlet pipe of pore; And the supplier that reducing agent or reducing agent precursor is supplied to the reducing agent etc. of waste gas.This SCR silencing apparatus is characterised in that to have only outlet pipe to be cut out by imperforate plate.
This plate can have shape as the cross section of tapered convex surface upstream.
And another kind of scheme of the present invention is a kind of SCR silencing apparatus, comprises being used for optionally reducing and the contained nitrogen oxide (NO of scavenging X) the SCR catalyzer; Allow waste gas to flow into the outlet pipe of SCR catalyzer; And the supply nozzle that reducing agent or reducing agent precursor is supplied to the reducing agent etc. of waste gas.The SCR silencing apparatus is characterised in that the supply nozzle of reducing agent etc. interts by having the plate of pore, and above-mentioned plate remains in the outlet pipe.
Description of drawings
Fig. 1 is the basic schematic representation according to the SCR silencing apparatus of first embodiment of the invention;
Fig. 2 is a kind of schematic representation of SCR silencing apparatus, wherein has only outlet pipe 2 to be closed by imperforate plate;
Fig. 3 is the sectional view according to the plate with pore 54 of first embodiment of the invention;
Fig. 4 shows that inflow is according to the exhaust flow in the SCR catalyzer 1 of first embodiment of the invention;
Fig. 5 shows inflow according to the exhaust flow in the SCR catalyzer 1 of first embodiment of the invention, wherein has only outlet pipe 2 to be closed by imperforate plate 4;
Fig. 6 is the basic schematic representation according to the SCR silencing apparatus of second embodiment of the invention;
Fig. 7 is the projection drawing according to the outlet pipe inside of second embodiment of the invention.
Embodiment
Below with reference to the accompanying drawings the best mode that is used for implementing SCR silencing apparatus of the present invention is described.
First embodiment
Fig. 1 is the basic schematic representation according to the SCR silencing apparatus of first embodiment of the invention, it comprise be used for optionally reducing and scavenging in contained nitrogen oxide (NO X) SCR catalyzer 1, the supplier 3 that allows waste gas to flow into the outlet pipe 2 of SCR catalyzer 1 and reducing agent or reducing agent precursor are supplied to the reducing agent etc. of waste gas, and it also has a plate 4 in the downstream of the supplier 3 of reducing agent etc. and the upstream of SCR catalyzer 1, and this plate 4 has the exhaust flow of dispersion and makes its uniform pore 5.Though Fig. 1 demonstrates the inside that outlet pipe 2 is inserted in silencing apparatus, this outlet pipe 2 and silencing apparatus also can form and replace outlet pipe 2 is inserted in the silencing apparatus.In addition, no matter no matter serial type or parallel connection type, shape are that circle or tube are all unimportant.
As shown in Figure 1, this embodiment describes the plate 4 that exhaust pipe 2 and silencing apparatus had pore 5 together and closes, but the present invention is not limited in this structure.That is to say that the plate 4 with pore 5 can be arranged on the lower exit end near the outlet pipe 2 of SCR catalyzer 1, perhaps can be arranged on a position in the outlet pipe 2, as long as this position is positioned at the downstream of supplier 3 of reducing agent etc. and the upstream of SCR catalyzer 1.Alternatively, it can be arranged in the silencing apparatus itself but not in the outlet pipe 2.
As shown in Figure 2, wherein outlet pipe 2 inside and its insertion position that are inserted in silencing apparatus has pore, and the present invention can have a kind of structure, wherein has only outlet pipe 2 to be closed by imperforate plate 4.
In having the SCR silencing apparatus of this structure, waste gas passes outlet pipe 2 and flows into SCR catalyzer 1. waste gas along the direction that is from upstream to the downstream and discharges from the internal-combustion engine of for example diesel engine and comprise the hydrocarbon (HC), carbon monoxide (CO) and for example nitrous oxide (NO) that do not fire and the nitrogen oxide (NO of nitrogen dioxide (NO2) X) toxic substance that waits.
The time durations of this waste gas before flowing into SCR catalyzer 1, the supplier 3 of the reducing agent by having reducing agent or reducing agent precursor etc. is supplied to.This reducing agent or reducing agent precursor comprise the reducing agent precursor of the material that for example discharges reducing agent, and reducing agent itself, and can be hydrocarbon, cyanurate (cyanurate), ammoniacal liquor, ammonium carbonate, aminoquinoxaline, urea and their compound.In addition, reducing agent or reducing agent precursor can be any forms in solid, the liquids and gases.
For example, the supplier 3 of reducing agent etc. can be supplied with ammoniacal liquor itself as reducing agent, but the ammoniacal liquor smell is strong and toxicity is big under high relatively concentration.Therefore, hypotoxic urea water is more suitable for supplying with through spraying as the reducing agent precursor.In this case, the waste gas in the urea in the urea water and the outlet pipe mixes and contact, and discharges ammoniacal liquor--a kind of reducing agent through heating or hydrolysis decomposition.In the present embodiment, urea water by means of additional nozzle from the waste gas of outside in injection is supplied to outlet pipe of outlet pipe.
After this, waste gas continues along the downstream direction outlet pipe of flowing through, and arrives the plate with pore 54 of SCR catalyzer 1 upstream.
Fig. 3 is the sectional view according to the plate with pore 54 of first embodiment of the invention.Pore-free 5 is arranged on the central part of closing outlet pipe 2, and a plurality of circular pore 5 only is arranged on the exterior lateral area of diameter greater than the exhaust pipe mouth zone, is provided with in staggered mode, thereby forms concentric circle.
But pore 5 shapes of the present invention are in circle, ellipse, strip, fan-shaped and other polygonal any, but more preferably similar punching hole.Pore 5 can be the combination in these shape holes.The size of pore 5 and quantity can be arbitrarily.In addition, pore 5 preferably is provided with symmetrically, and preferably only is arranged in the zone of diameter greater than outlet pipe.
In addition, but plate of the present invention 4 shapes are in circle, ellipse, square, taper and other polygonal any, and can be plane, convex surface or other shape.In addition, the arbitrary shape of semicircle for example or triangular pyramid can be adopted in the protruding cross section of rased panel, and its direction direction towards downstream, but preferably towards party upstream to.Preferably, plate 4 has the size of the opening that can close outlet pipe 2 and silencing apparatus, and as mentioned above diameter greater than the diameter of outlet pipe 2.Can there be a plate 4 or polylith plate 4.
Like this, in the present embodiment, because outlet pipe 2 cuts out by the central part that the pore-free 5 of plate 4 is arranged on wherein fully, the waste gas of flowing through outlet pipe and arriving plate 4 can not directly pass plate 4 and be blocked on the plate surface.Therefore, waste gas passes outlet pipe 2 and is inserted in pore in the part in the silencing apparatus, and flows out outlet pipe, and the space between silencing apparatus and the outlet pipe 2 of flowing through then arrives plate 4 once more.
After this, the waste gas that has flowed out outlet pipe passes the pore 5 in plate 4 exterior lateral area, flows into the SCR catalyzer 1 in its downstream, wherein contained nitrogen oxide (NO in the waste gas X) be absorbed in the SCR catalyzer 1.
This SCR (selective catalytic reduction effect) catalyzer 1 can be made by in titanium dioxide (TiO2), vanadic anhydride (V2O5), tungstic acid (WO3), molybdenum trioxide (MoO3), silica (SiO2), sulphate, zeolite etc. and the compound thereof any.In addition, SCR catalyzer 1 can be had the catalyst bracket splendid attire or the supporting of cellular structure.
This SCR catalyzer 1 optionally reduce and scavenging in contained nitrogen oxide (NO X) and be translated into the nitrogen and the water of environmental sound.Remove nitrogen oxide (NO X) efficient be subjected to flowing into the influence of the exhaust flow in the SCR catalyzer 1.
Fig. 4 has shown the exhaust flow in the SCR catalyzer 1 that flows into first embodiment.Fig. 4 (a) has shown the exhaust flow under the situation that is provided with the flat board 4 with pore 5, and Fig. 4 (b) has shown the exhaust flow under the situation that is provided with the rased panel 4 with pore 5.
As shown in Figure 4, outlet pipe 2 cuts out by the central part of the pore-free 5 of plate 4, and therefore, waste gas can not directly pass plate 4.Waste gas passes pore, the outflow outlet pipe in the outlet pipe 2, passes pore 5, inflow SCR catalyzer 1. in plate 4 exterior lateral area then
At this moment, the pore 5 in the plate 4 disperses and makes exhaust flow even, thereby makes the exhaust flow that flows into SCR catalyzer 1 be in good state.Notice that a bit under the situation of Fig. 4 (b), exhaust flow is because the resistance of convex surface and than more disperseing under the situation among Fig. 4 (a) and becoming more even.
Fig. 5 has shown the exhaust flow under the situation of having only outlet pipe 2 to be closed by pore-free plate 4 as shown in Figure 2.
In this case similarly, owing to stopping of the imperforate central part that is subjected to plate 4, the pore that waste gas passes in the exhaust port 2 flows out outlet pipe, but owing to the space between silencing apparatus and the outlet pipe 2 is not closed by plate 4, so waste gas does not have any SCR catalyzer 1 that flows into intrusively.Therefore, though exhaust flow is not disperseed and homogenization by the pore of as shown in Figure 4 plate, the exhaust flow that flows into SCR catalyzer 1 still is in good state with respect to the situation that does not have plate 4.
Be in as above kilter if flow into the exhaust flow of SCR catalyzer 1, then contained nitrogen oxide (NO in the waste gas X) be absorbed into the speed increase in the SCR catalyzer 1, remove nitrogen oxide (NO thereby improve X) efficient.
Second embodiment
Next second embodiment of the present invention will be described, wherein identical reference character represent with first embodiment in same or analogous parts, and different or newly-increased parts are represented by new reference character.
Fig. 6 is the basic schematic representation according to the SCR silencing apparatus of second embodiment of the invention.This SCR silencing apparatus comprises and is used for optionally reducing and the contained nitrogen oxide (NO of scavenging X) SCR catalyzer 1, the supply nozzle 30 that allows waste gas to flow into the outlet pipe 2 of SCR catalyzer 1 and reducing agent or reducing agent precursor are supplied to the reducing agent etc. of waste gas, the supply nozzle 30 of this reducing agent etc. interts by remaining on the plate with pore 5 40 in the outlet pipe 2.
Fig. 6 (a) has shown a kind of SCR silencing apparatus, wherein the supply nozzle 30 of reducing agent etc. interts in its end that (shape is as R or lug boss by having curved part, or plane) plate 40, and plate 40 remains in the outlet pipe 2 by the inside that curved part is fixed to outlet pipe 2.Simultaneously, Fig. 6 (b) has shown a kind of SCR silencing apparatus, and wherein the supply nozzle 30 of reducing agent etc. interts by conical plate 40 in its end, and by being clipped in the curved part on the bottom between the flange and being fixed, plate 40 remains in the outlet pipe 2.
In having the SCR silencing apparatus of this structure, waste gas passes outlet pipe 2 and flows into SCR catalyzer 1 along the direction that is from upstream to the downstream.The flow through time durations of waste gas before flowing into SCR catalyzer 1 of SCR silencing apparatus, the supplier 30 of the reducing agent by having reducing agent or reducing agent precursor etc. is supplied to.
In the present invention, the plate 40 that the supply nozzle 30 of reducing agent etc. interts by having pore 5, and this plate 40 remains in the outlet pipe 2.Therefore, the vibration that causes owing to the vibration that is subjected to by vehicle, waste gas and analog of the supply nozzle 30 of reducing agent etc. is inhibited or reduces.Consequently, reducing agent or for example the reducing agent precursor of urea water so that its homodisperse mode is supplied to waste gas through injection.In addition, the supply nozzle 30 of reducing agent etc. has improved serviceability owing to being reinforced by plate 40.
Fig. 7 is the projection drawing of outlet pipe inside when observing along the direction that is from upstream to the downstream of SCR silencing apparatus according to a second embodiment of the present invention.The pore 5 that waste gas passes plate 40 flows along the direction that is from upstream to the downstream.In addition, the supply nozzle of reducing agent etc. 30 interts by the central parts of plate 40, and reducing agent or for example the reducing agent precursor of urea water be supplied to by spraying along the direction that is from upstream to the downstream, and so that its homodisperse mode with the waste gas mixing with contact.
Plate 40 of the present invention can form any in circle, ellipse, square, taper and other polygonal, and can be plane, convex surface or other shape.Plate 40 preferably has the size of the mouth that can close outlet pipe 2.Can there be a plate 40 or polylith plate 40.
Intert modes by plate 40 for the supply nozzle 30 of reducing agent etc., intert in its end by plate 40 end of the supply nozzle 30 of reducing agent etc., and this plate 40 preferably is fixed in the supply nozzle 30 of reducing agent etc. and is in the outstanding a little state in end of this nozzle.
For the mode that plate 40 is remained in the outlet pipe 2, except other method, this plate 40 can be fixed in the inside of outlet pipe 2, perhaps clamping and being fixed between the outward flange of outlet pipe 2.
Waste gas further flows and flows into SCR catalyzer 1 along downstream direction, wherein contained nitrogen oxide (NO in the waste gas X) be absorbed in the SCR catalyzer 1 and optionally reduced and remove.Consequently, nitrogen oxide (NO X) be converted into the nitrogen and the water of environmental sound.
In the present invention, the waste gas that flows into SCR catalyzer 1 and reducing agent or for example the reducing agent precursor of urea water fully mix and contact, thereby contained nitrogen oxide (NO in the waste gas X) speed that is absorbed in the SCR catalyzer 1 becomes very high.Therefore, SCR catalyzer 1 is removed nitrogen oxide (NO X) efficient improve.
The present invention can be used as first and second embodiments' combination and implements.In this case, the exhaust flow of the SCR silencing apparatus of flowing through becomes well, and the vibration that causes of the suffered vibration by vehicle, waste gas and analog of supply nozzle of reducing agent etc. is inhibited or reduces.Consequently, the SCR catalyzer is removed nitrogen oxide (NO X) efficient improve, and the serviceability of the supply nozzle of reducing agent etc. improves.
The industry practicality
According to the present invention, the waste gas streams of the SCR silencer of flowing through becomes well, has therefore improved and has removed contained nitrogen oxide (NO in the waste gasX) efficient.
In addition, suppress or reduce the suffered vibration that is caused by vehicle, waste gas and similar thing such as the supply nozzle of reducing agent etc. according to SCR silencer of the present invention, therefore improved the SCR catalyst and removed nitrogen oxide (NOX) efficient and the durability of the supply nozzle of reducing agent etc.

Claims (1)

1. SCR silencing apparatus comprises:
Be used for optionally reducing and the contained nitrogen oxide (NO of scavenging X) the SCR catalyzer;
Make above-mentioned waste gas flow into the outlet pipe of SCR catalyzer; And
Reducing agent or reducing agent precursor are supplied to the supplier of the reducing agent etc. of above-mentioned waste gas,
It is characterized in that,
Sidepiece at above-mentioned outlet pipe is provided with pore,
Have the plate that disperses exhaust flow and make its uniform pore and be arranged on the downstream side of supplier of above-mentioned reducing agent etc. and the upstream side of described SCR catalyzer,
Above-mentioned plate is installed in the mode of the end of downstream side of sealing above-mentioned outlet pipe, and the diameter of this plate is greater than this outlet pipe,
The above-mentioned pore that is arranged on this plate only is arranged in the zone of diameter greater than described outlet pipe,
The zone of the above-mentioned end of downstream side of sealing in above-mentioned plate is provided with protuberance, and this protuberance has the sectional shape that the upstream side in above-mentioned outlet pipe protrudes.
CNB2005800038807A 2004-02-02 2005-02-02 SCR muffler Active CN100414078C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2004026074A JP4273011B2 (en) 2004-02-02 2004-02-02 SCR muffler
JP026074/2004 2004-02-02
JP035448/2004 2004-02-12

Publications (2)

Publication Number Publication Date
CN1914411A CN1914411A (en) 2007-02-14
CN100414078C true CN100414078C (en) 2008-08-27

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109154224A (en) * 2016-04-11 2019-01-04 斯堪尼亚商用车有限公司 Injection apparatus for being injected into urea liquid in exhaust steam passage

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JP2007077957A (en) * 2005-09-16 2007-03-29 Hino Motors Ltd Exhaust emission control device
US8171724B2 (en) * 2007-05-02 2012-05-08 Ford Global Technologies, Llc Vehicle-based strategy for removing urea deposits from an SCR catalyst
JP5553519B2 (en) * 2009-03-19 2014-07-16 日野自動車株式会社 Exhaust purification device
WO2012127621A1 (en) * 2011-03-22 2012-09-27 トヨタ自動車株式会社 Internal combustion engine exhaust conversion apparatus
CN102562232A (en) * 2011-12-31 2012-07-11 杭州银轮科技有限公司 Module used for installing ejection unit for tail gas treatment of diesel engine
KR101818264B1 (en) * 2012-10-16 2018-01-12 현대중공업 주식회사 Apparatus to reduce exhaust gas
JP7321113B2 (en) * 2019-02-19 2023-08-04 大阪瓦斯株式会社 catalyst container
NL2027378B1 (en) * 2021-01-25 2022-08-12 Array Ind B V A pre-mixing unit for pre-mixing exhaust gas

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Publication number Priority date Publication date Assignee Title
US5412946A (en) * 1991-10-16 1995-05-09 Toyota Jidosha Kabushiki Kaisha NOx decreasing apparatus for an internal combustion engine
US5628186A (en) * 1993-05-07 1997-05-13 Siemens Aktiengesellschaft Method and apparatus for controlled introduction of a reducing agent into a nitrogen oxide-containing exhaust gas

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
US5412946A (en) * 1991-10-16 1995-05-09 Toyota Jidosha Kabushiki Kaisha NOx decreasing apparatus for an internal combustion engine
US5628186A (en) * 1993-05-07 1997-05-13 Siemens Aktiengesellschaft Method and apparatus for controlled introduction of a reducing agent into a nitrogen oxide-containing exhaust gas

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109154224A (en) * 2016-04-11 2019-01-04 斯堪尼亚商用车有限公司 Injection apparatus for being injected into urea liquid in exhaust steam passage

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JP4273011B2 (en) 2009-06-03
JP2005214186A (en) 2005-08-11

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Effective date of registration: 20220407

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Patentee after: TOKYO ROKI CO.,LTD.

Patentee after: VOLVO TRUCK Corp.

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Patentee before: UD Trucks Corp.

Effective date of registration: 20220407

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Patentee after: UD Trucks Corp.

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Patentee before: Nissan Diesel Motor Co.,Ltd.