CN103696834B - SCR catalysis sound-attenuating system and SCR catalytic muffler thereof - Google Patents
SCR catalysis sound-attenuating system and SCR catalytic muffler thereof Download PDFInfo
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- CN103696834B CN103696834B CN201310557172.4A CN201310557172A CN103696834B CN 103696834 B CN103696834 B CN 103696834B CN 201310557172 A CN201310557172 A CN 201310557172A CN 103696834 B CN103696834 B CN 103696834B
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- nitrogen oxide
- oxide sensor
- scr catalytic
- catalytic muffler
- exhaust temperature
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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
- Y02T10/40—Engine management systems
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- Exhaust Gas After Treatment (AREA)
- Exhaust Silencers (AREA)
Abstract
The invention discloses a kind of SCR catalytic muffler, comprise body and be positioned at the nozzle carrier of described body, exhaust temperature sensor seat and nitrogen oxide sensor seat, described Ontology integration has urea nozzle, exhaust temperature sensor and nitrogen oxide sensor, and above three is installed on described nozzle carrier, exhaust temperature sensor seat and nitrogen oxide sensor seat respectively.Also disclose a kind of SCR catalysis sound-attenuating system with above-mentioned SCR catalytic muffler.Each component of this SCR catalytic muffler can module supply, improves supply of material efficiency; Further, quick for installation, convenient, application reliability is high, avoids, in car load factory, the phenomenon such as misloading, neglected loading occurs; The reasonable structural arrangement of internal system, space availability ratio is high.
Description
Technical field
The present invention relates to After-treatment technics technical field, particularly a kind of SCR catalytic muffler; Also relate to a kind of SCR catalysis sound-attenuating system.
Background technique
SCR technology (selective catalytic reduction technology) is usually used in the NO reducing vehicle or engineering machinery
x(nitrogen oxide) discharges.SCR technology eliminates NO
xneed catalyzer to assist, by described catalyst-coated on carrier, and special material is added to this carrier and carries out special structural design, after encapsulation, namely form SCR catalytic muffler.
SCR catalysis sound-attenuating system mainly comprises control unit, urea dosage device and catalytic reaction unit, and above three is interconnected into loop.The control unit of SCR system can be integrated with control unit of engine, is jointly called control unit, in order to perform control strategy, passes through NO
xthe signal of sensor and the signal of exhaust temperature sensor etc. control the supply of urea; Urea dosage device comprises urea supply unit, urea box and injection unit, and the urea in urea box is by urea supply unit supply injection unit, and urea is sprayed to catalytic reaction unit by nozzle by injection unit; Catalytic reaction unit mainly comprises SCR catalyst and is coated with the carrier of encapsulation of this catalyzer, in order to by NO
xbe reduced to nonhazardous material, discharge from discharge conduit.
SCR catalytic muffler generally comprises tub SCR catalytic muffler and box SCR catalytic muffler, and the two includes body, suction port, relief opening.The main difference point of the two is the shape of body, and tub SCR catalytic muffler has the body of barrel shape, and box SCR catalytic muffler has the body of box.Suction port, relief opening are all connected with body, and for dredging gas, nozzle and exhaust temperature sensor are installed on suction port place, and nitrogen oxide sensor seat is installed on exhaust ports.
In such scheme, urea nozzle, exhaust temperature sensor and nitrogen oxide sensor and SCR catalytic muffler are independently, car load producer needs each sensor to be installed on position corresponding to silencing apparatus respectively, more easily there is misloading, neglected loading phenomenon, and use inconvenient, the plug and play of SCR catalytic muffler can not be realized.
In addition, nitrogen oxide sensor control unit is installed on the outside of this SCR catalytic muffler, such as, the positions such as car load crossbeam, and nitrogen oxide sensor control unit need connect probe by connecting line, causes connecting line outside exposed, both unsightly also dangerous.
Therefore, how to make each components module of SCR catalytic muffler, installing, application reliability is high, easy to use, quick, is those skilled in the art's technical issues that need to address.
Summary of the invention
Object of the present invention is for providing a kind of SCR catalysis sound-attenuating system and SCR catalytic muffler thereof.The each component of this SCR catalytic muffler have modular feature, and it is installed, application reliability is high, easy to use, quick.
For solving the problems of the technologies described above, the invention provides a kind of SCR catalytic muffler, comprising body and being positioned at the nozzle carrier of described body, exhaust temperature sensor seat and nitrogen oxide sensor seat; And described Ontology integration has urea nozzle, exhaust temperature sensor and nitrogen oxide sensor, above three is installed on described nozzle carrier, exhaust temperature sensor seat and nitrogen oxide sensor seat respectively.
So, each component of SCR catalytic muffler can module supply, improves supply of material efficiency; Further, quick for installation, convenient, application reliability is high, avoids, in car load factory, the phenomenon such as misloading, neglected loading occurs; The reasonable structural arrangement of internal system, space availability ratio is high.
Preferably, also have the nozzle guard frame surrounding described urea nozzle and described exhaust temperature sensor, described nozzle guard frame is fixedly connected on described body.
This nozzle guard frame is fixedly connected on above-mentioned body, is positioned near urea nozzle and exhaust temperature sensor, and surrounds said two devices, and both protections are not collided with in transport and installation process.
Preferably, described nozzle guard frame comprises the first curved plate and the second curved plate that cross one another, and described first curved plate two end part are connected with described body bolt; The two end part of described second curved plate are welded with the two ends of described first curved plate respectively.
Structural type in the present embodiment, on the basis that protection urea nozzle and exhaust temperature sensor are not collided with, saves material more, is easy to processing, and reasonably can adapts to the installing space at urea nozzle, exhaust temperature sensor place.
Preferably, also have the nitrogen oxide sensor fender bracket surrounding described nitrogen oxide sensor, described nitrogen oxide sensor fender bracket is fixedly connected on described body.
Nitrogen oxide sensor fender bracket simple installation, its inner space can hold nitrogen oxide sensor, thus protects the impact that it is not collided with and water spatters.
Preferably, described body comprises body, is positioned at the suction port of described body front end, and is positioned at the relief opening of described body ear end face, and described urea nozzle and described exhaust temperature sensor are all positioned at described suction port.
Preferably, described nitrogen oxide sensor and described nitrogen oxide sensor fender bracket are positioned at the side, rear end of described body; Described nitrogen oxide sensor fender bracket comprises a housing welded with described body, and described nitrogen oxide sensor is positioned at described housing.
Preferably, also comprise nitrogen oxide sensor control unit, described nitrogen oxide sensor control unit is positioned at described enclosure interior, and, adopt bolt to be fixedly connected with described housing.
Preferably, described nitrogen oxide sensor and described nitrogen oxide sensor fender bracket are located at the ear end face of described body, and are positioned at the top of described relief opening; Described nitrogen oxide sensor fender bracket comprises the housing surrounded by sheet metal part, and described housing is fixedly connected with described ear end face.
Preferably, also comprise nitrogen oxide sensor control unit, described nitrogen oxide sensor control unit is positioned at described enclosure interior, and, adopt bolt to be fixedly connected with described housing.
The present invention also provides a kind of SCR catalysis sound-attenuating system, comprises control unit of engine, also comprises above-mentioned SCR catalytic muffler, and described control unit of engine is connected to described SCR catalytic muffler.
This SCR catalysis sound-attenuating system, easy to use, quick for installation.
Accompanying drawing explanation
Fig. 1 is the perspective view of the first embodiment that the invention provides SCR catalytic muffler;
Fig. 2 is the plan view of SCR catalytic muffler in Fig. 1;
Fig. 3 is the left view of SCR catalytic muffler in Fig. 1;
Fig. 4 is the perspective view of the second embodiment that the invention provides SCR catalytic muffler;
Fig. 5 is the left view of SCR catalytic muffler in Fig. 4;
Fig. 6 is the right elevation of SCR catalytic muffler in Fig. 4;
Fig. 1-6:
1 body, 2 exhaust temperature sensor seats, 3 nozzle carriers, 4 nitrogen oxide sensor seats, 5 nitrogen oxide sensor control units, 11 bodies, 12 suction ports, 13 relief openings, 21 exhaust temperature sensors, 31 urea nozzle, 32 nozzle guard framves, 41 nitrogen oxide sensors, 42 nitrogen oxide sensor fender brackets, 32a first curved plate, 32b second curved plate, 42a extension
Embodiment
In order to make those skilled in the art understand technological scheme of the present invention better, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Please refer to Fig. 1 to Fig. 3, Fig. 1 is the perspective view of the first embodiment that the invention provides SCR catalytic muffler; Fig. 2 is the plan view of SCR catalytic muffler in Fig. 1; Fig. 3 is the left view of SCR catalytic muffler in Fig. 1.
As shown in Figures 1 to 3, SCR catalytic muffler provided by the invention comprises body 1, is installed on the nozzle carrier 3 of body 1, exhaust temperature sensor seat 2 and nitrogen oxide sensor seat 4.Body 1 is also integrated with the urea nozzle 31, exhaust temperature sensor 21 and the nitrogen oxide sensor 41 that coordinate with above-mentioned three respectively.
In present embodiment, above-mentioned each parts and above-mentioned body 1 are integrated into an entirety, during use, by circuit, this SCR catalytic muffler are connected to control unit and urea dosage device.
So, each component of SCR catalytic muffler can module supply, improves supply of material efficiency; Further, quick for installation, convenient, application reliability is high, avoids, in car load factory, the phenomenon such as misloading, neglected loading occurs; The reasonable structural arrangement of internal system, space availability ratio is high.
In one embodiment, above-mentioned body 1 comprises body 11, is positioned at the suction port 12 of this body 11 front end and is positioned at the relief opening 13 of this body 11 rear end.Above-mentioned urea nozzle 31 is all positioned at suction port 12 place with exhaust temperature sensor 21, avoid urea, in pipeline, crystallization occurs, and the gas parameter that exhaust temperature sensor 21 records is more accurate.
SCR catalytic muffler also has nozzle guard frame 32, and this nozzle guard frame 32 is fixedly connected on above-mentioned body 1, is positioned near urea nozzle 31 and exhaust temperature sensor 21, and surrounds said two devices, and both protections are not collided with in transport and installation process.
Can also be improved further this SCR catalytic muffler.
Said nozzle fender bracket 32 surrounds urea nozzle 31 and exhaust temperature sensor 21, can realize in the following manner:
Nozzle guard frame 32 comprises two curved plates, is respectively the first curved plate 32a and the second curved plate 32b.The two end part of the first curved plate 32a are fixedly connected on body 1, joint is positioned near nozzle carrier 3 and exhaust temperature sensor seat 2, the above-mentioned urea nozzle of its arc section outsourcing 31 and exhaust temperature sensor 21, then arc section and urea nozzle 31 and exhaust temperature sensor 21 radially have gap; The two end part of the second curved plate 32b are fixedly connected on the two ends of above-mentioned first curved plate 32a respectively; this the second curved plate 32b and above-mentioned first curved plate 32a is positioned at two roughly mutually perpendicular planes; and with urea nozzle 31 and exhaust temperature sensor 21, there is radial clearance; namely urea nozzle 31 and exhaust temperature sensor 21 contactlessly can be positioned at the space that two curved plates and body 1 are formed; so, then nozzle guard frame 32 surrounds urea nozzle 31 and exhaust temperature sensor 21.
Above-mentioned first curved plate 32a is fixedly connected with can adopts various ways with body 1, and such as, welding, riveted joint etc., the present invention is preferably bolt and connects, and such Placement is convenient to opening and inspecting and replacing urea nozzle 31 and exhaust temperature sensor 21.
Similarly, being fixedly connected with between above-mentioned two curved plates also can adopt various ways, specifically as described above.The present invention is preferably welding, and such Placement, makes two curved plates be connected firmly, and saves the space that bolt connection piece or riveting part etc. take.
Should be appreciated that the structural type of nozzle guard frame 32 is not limited to mentioned above.Such as; circular arc thin plate can be adopted; this thin plate is fixedly connected with body 1; and there is corresponding size; this nozzle guard frame 32 is contactlessly positioned to make urea nozzle 31 and exhaust temperature sensor 21 radial direction; correspondingly, this thin plate has opening, is convenient to urea nozzle 31, exhaust temperature sensor 21 carries out pipeline and connection with the external world.
Be appreciated that, first curved plate 32a and the second curved plate 32b is not limited to the set-up mode of above-mentioned square crossing, as long as the two is arranged in a crossed manner, there is certain angle, to form the space that external member can be stoped directly to bump to urea nozzle 31 and exhaust temperature sensor 21.And, the present invention does not do concrete restriction to the number of curved plate and installation direction, as the visual angle of Fig. 2, can arrange the 3rd curved plate abreast on the right side of the second curved plate 32b, the Placement of itself and the first curved plate 32a can refer to the second curved plate 32b.
In contrast; in the present embodiment, the structural type of nozzle guard frame 32 is on the basis that protection urea nozzle 31 and exhaust temperature sensor 21 are not collided with; more save material, be easy to processing, and reasonably can adapt to the installing space at urea nozzle 31, exhaust temperature sensor 21 place.
SCR catalytic muffler can be divided into tub SCR catalytic muffler and box SCR catalytic muffler according to the shape difference of its body 11.Above two kinds of SCR catalytic mufflers all can have nitrogen oxide sensor fender bracket 42, and this nitrogen oxide sensor fender bracket 42 is fixedly connected on above-mentioned body 1, and surrounds nitrogen oxide sensor 41.
As Fig. 1 and Fig. 2, for tub SCR catalytic muffler, above-mentioned nitrogen oxide sensor 41 is positioned at the side, rear end of body 11, and correspondingly, nitrogen oxide sensor fender bracket 42 is also positioned at this side, body 11 rear end.Particularly, this nitrogen oxide sensor fender bracket 42 can comprise a housing.This housing comprises a semi-enclosed rectangle frame, and this rectangle frame inside has space, and, in rectangle frame external process bracket, to be fixedly connected with above-mentioned body 1.
This nitrogen oxide sensor fender bracket 42 simple installation, its inner space can hold nitrogen oxide sensor 41, thus protects it not to be subject to impact of colliding with.
As shown in Figure 3, above-mentioned nitrogen oxide sensor fender bracket 42 also has extension 42a, and this extension 42a is above-mentioned bracket, and it welds with described body 1.Nitrogen oxide sensor fender bracket 42 and the joint of body 1, likely dabble; Threaded connector or rivet easily get rusty, loosen, cause Joint failure, therefore, the present invention preferably welds with the Placement of body 1 nitrogen oxide sensor fender bracket 42, and this kind of Placement is more firm, and reliability is higher.
Please refer to Fig. 4 to Fig. 6, Fig. 4 is the perspective view of the second embodiment that the invention provides SCR catalytic muffler; Fig. 5 is the left view of SCR catalytic muffler in Fig. 4; Fig. 6 is the right elevation of SCR catalytic muffler in Fig. 4.
Box SCR catalytic muffler has the structure identical with above-mentioned tub SCR catalytic muffler, and such as, urea nozzle 31, exhaust temperature sensor 21 and nitrogen oxide sensor 41 are all integrated in body 1.Nozzle guard frame 32 and nitrogen oxide sensor fender bracket 42 can protect above-mentioned urea nozzle 31 and nitrogen oxide sensor 41 respectively.
Take Fig. 4 as visual angle, for box SCR catalytic muffler, above-mentioned nitrogen oxide sensor 41 is positioned at the ear end face of body 11, the top of relief opening 13, and is surrounded by nitrogen oxide sensor fender bracket 42.This nitrogen oxide sensor fender bracket 42 comprises the housing surrounded by sheet metal part, and its concrete generation type is as follows:
The rectangular sheet metal part of one concave shape is fixedly connected with by bracket with body 11, afterwards, is arranged corresponding thereto by rectangular for another concave shape sheet metal part, and namely the concave-shaped openings of the rectangular sheet metal part of two concave shapes is relative, to hold above-mentioned nitrogen oxide sensor 41; Wherein, described bracket is the extension 42a of above-mentioned nitrogen oxide sensor fender bracket 42, and this extension 42a welds with the ear end face of body 11.
Above-mentioned nitrogen oxide sensor 41 and nitrogen oxide sensor fender bracket 42 all can be arranged at the rear portion of body 11, and such arrangement is conducive to the test accuracy improving nitrogen oxide sensor 41.Particularly, box SCR catalytic muffler is usually used in the truck with higher chassis, by its nitrogen oxide sensor 41 and probe placement thereof in the ear end face of body 11, and is held by nitrogen oxide sensor fender bracket 42, even if be positioned at above relief opening 13, be also not easy to be subject to the impact that dabbles; Tub SCR catalytic muffler is usually used in having the passenger vehicle compared with low chassis; rear end relief opening is overhead nearer; the phenomenon that dabbles more easily occurs; therefore can by nitrogen oxide sensor 41 and probe placement thereof in side, rear end; and be not located immediately at above relief opening 13; namely be not directly exposed to the external world, in addition the protection of nitrogen oxide sensor fender bracket 42, thus effectively avoid water to spatter.
Above-mentioned nitrogen oxide sensor 41 and nitrogen oxide sensor fender bracket 42 all can be arranged at ear end face or the side, rear end of body 11, according to its use occasion, are preferably set-up mode of the present invention, and are arranged at other positions and are also fine.
For above-mentioned two kinds of SCR catalytic mufflers, nitrogen oxide sensor control unit 5 all can be positioned at the housing of nitrogen oxide sensor fender bracket 42, and is connected with casing bolts.So; nitrogen oxide sensor control unit 5 and the connecting line of the probe of nitrogen oxide sensor 41 are positioned in described housing in the lump; avoid circuit to leak outside and affect attractive in appearance; simultaneously; nitrogen oxide sensor fender bracket 42 plays certain protective action; avoid sensor control unit and probe to be collided with, or connecting line is subject to water and spatter.
The present invention also provides a kind of SCR catalysis sound-attenuating system, and this system comprises control unit of engine, and the SCR catalytic muffler in the various embodiments described above, and the two is connected, and has coordinated the catalysis of nitrogen oxide to eliminate the noise.This SCR catalysis sound-attenuating system has identical beneficial effect with above-mentioned SCR catalytic muffler, does not repeat them here.
Above a kind of SCR catalysis sound-attenuating system provided by the present invention and SCR catalytic muffler thereof are all described in detail.Apply specific case herein to set forth principle of the present invention and mode of execution, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection domain of the claims in the present invention.
Claims (9)
1. a SCR catalytic muffler, is characterized in that, comprises body (1) and is positioned at the nozzle carrier (3) of described body (1), exhaust temperature sensor seat (2) and nitrogen oxide sensor seat (4); And described body (1) is integrated with urea nozzle (31), exhaust temperature sensor (21) and nitrogen oxide sensor (41), above three is installed on described nozzle carrier (3), described exhaust temperature sensor seat (2) and described nitrogen oxide sensor seat (4) respectively; Described body (1) comprises body (11), is positioned at the suction port (12) of described body (11) front end, and being positioned at the relief opening (13) of described body (11) ear end face, described urea nozzle (31) and described exhaust temperature sensor (21) are all positioned at described suction port (12).
2. SCR catalytic muffler as claimed in claim 1; it is characterized in that; also have the nozzle guard frame (32) surrounding described urea nozzle (31) and described exhaust temperature sensor (21), described nozzle guard frame (32) is fixedly connected on described body (1).
3. SCR catalytic muffler as claimed in claim 2, it is characterized in that, described nozzle guard frame (32) comprises the first curved plate (32a) and the second curved plate (32b) that cross one another, and described first curved plate (32a) two end part are connected with described body (1) bolt; The two end part of described second curved plate (32b) are welded with the two ends of described first curved plate (32a) respectively.
4. the SCR catalytic muffler as described in any one of claim 1-3; it is characterized in that; also have the nitrogen oxide sensor fender bracket (42) surrounding described nitrogen oxide sensor (41), described nitrogen oxide sensor fender bracket (42) is fixedly connected on described body (1).
5. SCR catalytic muffler as claimed in claim 4, is characterized in that, described nitrogen oxide sensor (41) and described nitrogen oxide sensor fender bracket (42) are positioned at the side, rear end of described body (11); Described nitrogen oxide sensor fender bracket (42) comprises a housing welded with described body (1), and described nitrogen oxide sensor (41) is positioned at described housing.
6. SCR catalytic muffler as claimed in claim 5, it is characterized in that, also comprise nitrogen oxide sensor control unit (5), described nitrogen oxide sensor control unit (5) is positioned at described enclosure interior, further, bolt is adopted to be fixedly connected with described housing.
7. SCR catalytic muffler as claimed in claim 4, it is characterized in that, described nitrogen oxide sensor (41) and described nitrogen oxide sensor fender bracket (42) are located at the ear end face of described body (11), and are positioned at the top of described relief opening (13); Described nitrogen oxide sensor fender bracket (42) comprises the housing surrounded by sheet metal part, and described housing is fixedly connected with described ear end face.
8. SCR catalytic muffler as claimed in claim 7, it is characterized in that, also comprise nitrogen oxide sensor control unit (5), described nitrogen oxide sensor control unit (5) is positioned at described enclosure interior, further, bolt is adopted to be fixedly connected with described housing.
9. a SCR catalysis sound-attenuating system, comprises control unit of engine, it is characterized in that, also comprises the SCR catalytic muffler described in any one of claim 1-8, and described control unit of engine is connected to described SCR catalytic muffler.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310557172.4A CN103696834B (en) | 2013-11-11 | 2013-11-11 | SCR catalysis sound-attenuating system and SCR catalytic muffler thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310557172.4A CN103696834B (en) | 2013-11-11 | 2013-11-11 | SCR catalysis sound-attenuating system and SCR catalytic muffler thereof |
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| CN103696834B true CN103696834B (en) | 2016-02-10 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104047687A (en) * | 2014-07-03 | 2014-09-17 | 中国重汽集团济南动力有限公司 | Catalytic conversion device for heavy-duty vehicle |
| CN107989675A (en) * | 2017-12-04 | 2018-05-04 | 潍柴动力股份有限公司 | Integrated form DOC-DPF-SCR assembly apparatus for After-treatment technics |
| CN108223065A (en) * | 2018-03-07 | 2018-06-29 | 潍柴动力股份有限公司 | A kind of DOC-DPF-SCR assembly apparatus |
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| CN201581966U (en) * | 2009-09-25 | 2010-09-15 | 中国第一汽车集团公司 | Combination structure of automobile tail gas catalytic reduction postprocessor |
| CN202832721U (en) * | 2012-05-25 | 2013-03-27 | 天纳克（中国）有限公司 | Integrated type automotive semiconductor control rectifier (SCR) system |
| CN203570399U (en) * | 2013-11-11 | 2014-04-30 | 潍柴动力股份有限公司 | SCR catalytic sound elimination system and SCR catalytic sound eliminator thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US9217355B2 (en) * | 2011-12-12 | 2015-12-22 | Caterpillar Inc. | Sensor mounting arrangement |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201581966U (en) * | 2009-09-25 | 2010-09-15 | 中国第一汽车集团公司 | Combination structure of automobile tail gas catalytic reduction postprocessor |
| CN202832721U (en) * | 2012-05-25 | 2013-03-27 | 天纳克（中国）有限公司 | Integrated type automotive semiconductor control rectifier (SCR) system |
| CN203570399U (en) * | 2013-11-11 | 2014-04-30 | 潍柴动力股份有限公司 | SCR catalytic sound elimination system and SCR catalytic sound eliminator thereof |
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