CN105189963A

CN105189963A - Engine exhaust after-treatment system

Info

Publication number: CN105189963A
Application number: CN201380075456.8A
Authority: CN
Inventors: 威廉·V·阿尔奇尼; 迈克尔·戈林; 王林; 邢文亮
Original assignee: Tenneco Automotive Operating Co Inc
Current assignee: Tenneco Automotive Operating Co Inc
Priority date: 2013-04-10
Filing date: 2013-04-10
Publication date: 2015-12-23
Also published as: US20160047285A1; DE112013006933T5; KR20150139968A; WO2014166076A1; JP2016514799A

Abstract

An engine exhaust after-treatment system including an exhaust passage; an exhaust treatment component housing communicating with the exhaust passage; a pair of baffles spaced apart within the housing; a plurality of exhaust treatment devices positioned between the pair of baffles, each exhaust treatment device including a canister; a plurality of restraining devices fixed between the pair of baffles for positioning each of the canisters between the baffles, each restraining device including at least a portion thereof that is angled relative to an outer surface of the canister such that ends of the restraining device abut the outer surface of the canister at the first end and prevent radial movement of the canister; and a soot blower positioned in the housing upstream of the exhaust treatment devices, the soot blower for dispersing particulate matter deposited on each of the exhaust treatment devices.

Description

Engine exhaust after-treatment system

Technical field

The disclosure relates to engine exhaust after-treatment system.

Background technique

This part provides the background information relevant to the disclosure, and it is prior art not necessarily.

Known explosive motor produces may environmentally harmful effulent.When attempting the environmetal impact that reduction motor may have, a large amount of analysis and modifications is carried out to exhaust after treatment system.The various parts of auxiliary processing emissions from engines comprise particulate filter and oxidation reduction catalyst.

As time goes by, some exhaust after-treatment component in various exhaust after-treatment component may need to remove and maintenance.A kind of mode realizing this point makes various after-treatment component remove from assembly and to clean individually subsequently.But according to the size of engine application, the consuming time and degree of difficulty of this task all likely increases.In this respect, the such as larger engine application of train, boats and ships and high-power static applications and so on may produce ratio such as tractor-trailer and apply much bigger toxic emission.Therefore, exhaust after treatment system is usually much bigger in size applies by these large scales the effulent produced to process fully.Due to the increase of after-treatment system, therefore, the ability of keeping in repair this system also becomes much more difficult.

Summary of the invention

This part provides overall summary of the present disclosure, but this part is not that its four corner or its institute are characteristic openly comprehensive.

Present disclose provides a kind of engine exhaust after-treatment system, this engine exhaust after-treatment system comprises exhaust passage; The exhaust gas treatment components housing be communicated with described exhaust passage; Be positioned at isolated a pair baffle plate of described housing; Be positioned at the multiple exhaust gas treatment devices between described a pair baffle plate, each exhaust gas treatment device comprises tank; Multiple restricting means, described multiple restricting means is fixed between described a pair baffle plate to be positioned between baffle plate by each tank in described tank, each restricting means at least comprise this restricting means relative to the angled part of the outer surface of tank, make the end of restricting means abut the outer surface of described tank at the first end place of described tank and stop the radial motion of described tank; And dust-blowing device, described dust-blowing device to be positioned in described housing and to be positioned at the upstream of exhaust gas treatment device, and described dust-blowing device is for dispersing out the particulate matter on each exhaust gas treatment device be deposited in exhaust gas treatment device.

Other applicable fields will become obvious by description provided herein.Description in this summary and concrete example only for illustration of object, and have no intention limit the scope of the present disclosure.

Accompanying drawing explanation

Accompanying drawing described in literary composition only for the object but not all possible way of realization of selecting mode of execution are described, and is not intended to limit the scope of the present disclosure.

Fig. 1 is the schematic diagram of the vent systems according to principle of the present disclosure;

Fig. 2 is the stereogram of the exhaust after treatment system according to principle of the present disclosure;

Fig. 3 is the exploded perspective view of the exhaust after treatment system shown in Fig. 2;

Fig. 4 is the exploded partial perspective view of the exhaust gas treatment components according to principle of the present disclosure;

Fig. 5 is the stereogram of the housing of exhaust gas treatment components according to principle of the present disclosure;

Fig. 6 is the stereogram of the inside from the housing shown in the viewed Fig. 5 of inlet side;

Fig. 7 is the stereogram of the inside from the housing shown in the viewed Fig. 5 of outlet side;

Fig. 8 is the sectional view intercepted along the line 8-8 shown in Fig. 5; And

Fig. 9 is the amplification sectional view of an exhaust gas treatment components in the exhaust gas treatment components shown in Fig. 8.

In all several accompanying drawings, the parts that corresponding reference character instruction is corresponding.

Embodiment

More fully example embodiment is described now with reference to accompanying drawing.

Fig. 1 schematically shows according to vent systems 10 of the present disclosure.Vent systems 10 at least can comprise the motor 12 be communicated with 14b with a pair fuel source 14a, and generation is just discharged into the exhausting air had in the exhaust passage 16 of exhaust after treatment system 18 once burned by described fuel.Fuel source 14a and 14b can hold different fuel.Such as, fuel source 14a can comprise low sulphur diesel fuel (LSF), and fuel source 14b can comprise ultra low sulfur diesel fuel (ULSF).Other example fuel operable comprise marine gas oil (MGO), marine diesel oil (MDO), intermediate fuel oil (IFO), heavy fuel oil (HFO), rock gas and the combination of diesel fuel or the mixture of rock gas and hydrogen.In addition, should be appreciated that the combination in any that can store above-mentioned fuel in fuel source 14a and 14b.

The downstream of motor 12 can arrange exhaust gas treatment components 20, and exhaust gas treatment components 20 can comprise diesel oxidation catalyst (DOC), be coated with diesel particulate filter (DPF) parts of catalyzer or selective catalytic reduction (SCR) parts 22 as shown.Although what illustrate is SCR parts 22, should be appreciated that in SCR parts 22 and also can comprise DOC or DPF.In addition, SCR parts 22 can be the flow type filter cleaners (FTF) that DPF or SCR formula that SCR formula is coated with catalyzer is coated with catalyzer.

Exhaust after treatment system 18 can also comprise the parts of such as hot intensifier or burner 24 and so on to make the increase in temperature of the exhaust through exhaust passage 16.The temperature increasing exhaust to be not only conducive under the climatic environment of cold and pilot engine 12 time realize the ignition of the catalyzer in exhaust gas treatment components 20, and be conducive to the regeneration starting exhaust gas treatment components 20 when exhaust gas treatment components 20 is DPF.

In order to the effulent that auxiliary minimizing motor 12 produces, exhaust after treatment system 18 can comprise the dispensing module 26 for being periodically distributed to by pump-down process fluid in exhaust stream.As shown in fig. 1, module 26 of providing and delivering can be arranged in the upstream of exhaust gas treatment components 20 and can operate into pump-down process Fluid injection to exhaust stream.In this respect, dispensing module 26 be communicated with pump 30 fluid with reagent box 28 by entering pipeline 32, with by the pump-down process fluid dispensing of such as diesel fuel, urea or gaseous ammonia and so on in the exhaust passage 16 of exhaust gas treatment components 20 upstream.Case 28 can store liquid pump-down process fluid or can store solid-state ammonia or gaseous ammonia.The other materials that can combine to strengthen pump-down process with urea can be to be stored in ethanol in independent case (not being illustrated) or hydrogen.

Dispensing module 26 can also be communicated with reagent box 28 via reflux pipeline 34.Reflux pipeline 34 allows any pump-down process fluid be not dispensed in exhaust stream to be all back to reagent box 28.Through enter pipeline 32, dispensing module 26 and reflux pipeline 34 pump-down process fluid stream also this dispensing module 26 of supplement heat rejecter to make this dispensing module 26 not overheated.Although not shown in figures, dispensing module 26 can be configured to comprise and make freezing mixture around dispensing module 26 coolant jacket of walking to cool this dispensing module 26.

The amount of the pump-down process fluid of process needed for exhaust stream can with the flow of the temperature of load, engine speed, exhaust, exhaust, engine fuel injection timing, required NO effectively _x(nitrogen oxide) reduction, air pressure, relative moisture, EGR rate and engineer coolant temperature and change.NO can be positioned with in the downstream of SCR parts 22 _xsensor or instrument 36.NO _xsensor 36 can operate into the NO exporting instruction exhaust to control unit of engine (ECU) 38 _xthe signal of content.Some engine operation parameters in all engine operation parameters or engine operation parameters can be supplied to exhaust system controller 40 from ECU38 via engine/vehicle data/address bus.Exhaust system controller 40 also can be included as a part of ECU38.The temperature of exhaust, the flow of exhaust, exhaust back pressure and other vehicle operating parameter can be measured by corresponding sensor, as shown in fig. 1.

The amount of the pump-down process fluid of process needed for exhaust stream also can be depending on the size of motor 12 effectively.In this respect, the large scale diesel engine be used in train, marine vessel applications and static applications may have the extraction flow of the capacity exceeding single dispensing module 26.Therefore, although only single dispensing module 26 is shown as urea dispensing, should be appreciated that and expect multiple dispensing module 26 to be used for urea-spray by the disclosure.

Between the on-stream period of motor 12, as already pointed out, the type of the fuel provided to motor 12 can switch between different fuel source 14a and 14b.When fuel source 14a and 14b carries the fuel with different sulphur content respectively, should be appreciated that after-treatment system 18 is non-essential to be used when motor 12 use has the fuel of higher sulphur content.That is, when motor 12 is when the marine vessel applications of ship distance bank intended distance, emission regulation may not require to use after-treatment system 18.Correspondingly, motor 12 when using high-sulphur fuel (or fuel of any type) exhaust that produces can not need through after-treatment system 18 be discharged in air.In order to exhaust is directly discharged in air by processing system 18 before after arrival, vent systems 10 can comprise reprocessing bypass tube 44.

Valve 48 can be positioned with to allow exhaust air flow through bypass tube 44 or to flow through after-treatment system 18 in the ingress of bypass tube 44.Valve 48 is communicated with controller 40 or ECU38.When motor 12 operates with high-sulphur fuel, controller 40 or ECU38 can instruction valve 48 to open the exhaust passage 16 in bypass tube 44 and cut-off valve 48 downstream, thus allow exhaust when not through after-treatment system 18 row escape in air.Similarly, when motor 12 specifies to require to operate in the region of exhaust aftertreatment in effulent, controller 40 or ECU38 can instruction valve 48 to close bypass tube 44, thus allow exhaust through after-treatment system 18.

The fuel being provided to motor 12 by fuel tank 14a and 14b controls respectively by valve 50a and 50b.Valve 50a with 50b is communicated with controller 40 and/or ECU38.When be desirably in switch between the fuel provided by case 14a and 14b time, controller 40 or ECU38 can open or close by instruction valve 50a and 59b.Such as, when motor 12 is from the Fuel switching of high sulfur-bearing to the fuel of low sulfur-bearing, controller 40 or ECU38 can to close and instruction valve 50b opens by instruction valve 50a.To send instruction to valve 50a and valve 50b to make before it opens or closes at controller 40 or ECU38, controller 40 or ECU38 can the burned degree (such as 300 DEG C) of instruction burner 24 any not burned fuel of starting that delivery temperature is increased to and make to exist in exhaust stream.In this respect, if expect the switching of fuel, then controller 40 or ECU38 can send signal instruction burner 24 and start and the actuating of delay valve 50a and 50b, until burner 24 has operated reach predetermined duration.

Although the disclosure does not have requirement, during should be appreciated that the switching carrying out fuel when burner 24 is activated, valve 48 can be controlled so as to open bypass tube 44.When the switching of fuel completes and burner 24 is stopped using, valve 48 can cut out bypass tube 44 and allow exhaust through exhaust after treatment system 18.In this way, can guarantee to prevent any not burned high sulfur content fuel from arriving SCR parts 22.

In addition, valve 48 can be designed to synchronous with fuel valve 50a and 50b.That is, to make it open, motor 12 can be operated if send signal by controller 40 to fuel valve 50b with low sulfurous fuels, then valve 48 can receive signal to cut out bypass tube 44 simultaneously, thus allows exhaust to travel across exhaust after treatment system 18.Similarly, to open fuel valve 50a, motor 12 can be operated if send signal by controller 40 with high sulfur content fuel, then valve 48 can receive signal to open bypass tube 44 simultaneously, thus allows exhaust being discharged in air through before after-treatment system 18.

Referring now to Fig. 2 to Fig. 9, show according to exemplary exhaust after-treatment system 18 of the present disclosure.After-treatment system 18 comprises the exhaust passage 16 exhaust produced by motor 12 being provided to exhaust gas treatment components 20.A pair mixing arrangement 52 can be provided with in the position between dispensing module 26 and exhaust gas treatment components 20 in exhaust passage 16.The auxiliary pump-down process fluid be dispensed in exhaust passage 16 that makes of mixing arrangement 52 scatters and mixes with the exhaust that motor 12 produces.Although illustrated a pair mixing arrangement 52 in Fig. 2 and Fig. 3, should be appreciated that when not deviating from the scope of the present disclosure, the mixing arrangement 52 of more or less number can have been used.Exhaust after treatment system 18 can be supported by multiple supporting structure 53.

The entrance 54 of bypass tube 44 is positioned at the downstream of mixing arrangement 52.Valve 48 can be positioned entrance 54 place and can operate into permission exhaust to advance to get around exhaust gas treatment components 20 in exhaust passage 16.Although not shown in Figure 1, should be appreciated that and also can locate other valve 56 at exhaust gas treatment components entrance 58 place, to make when bypass tube 44 is opened to stop fluid stream through exhaust gas treatment components 20 by valve 56.In other words, if valve 48 is opened, then valve 56 cuts out.Each in valve 48 and valve 56 such as can for the butterfly valve activated by solenoid (not being illustrated).

Bypass tube 44 in design can modularization.Such as, bypass tube 44 can comprise the pair of curved part 60a and 60b that are connected with 66 via multiple intermediate portion 62,64.Although intermediate portion 62 and 66 is shown as the pipe of cylindrical shape in figs. 2 and 3, should be appreciated that the flexible corrugated pipe allowing thermal expansion during intermediate portion 62 and 66 can be included in use bypass tube 44.The downstream of curved section 60b can be outlet 68, exports 68 by the exhaust of bypass to the exhaust passage 16 sending back to the position being arranged in exhaust gas treatment components 20 downstream.The entrance 54 of bypass tube 44 and outlet 68 can be with exhaust passage 16 integrally or all-in-one-piece, or curved section 60a and 60b and intermediate portion 62,64 and 66 can be similar to but the parts formed separately.

Exhaust gas treatment components 20 can comprise the housing 70 supporting multiple SCR parts 22.In the embodiment as shown, housing 70 is configured as box-shaped and comprises multiple outer panels 71.In the outer panels 71 of housing 70, multiple truss 73 can be set.Truss 73 can be the L shape component being positioned at the corner part place of outer panels 71 decided at the higher level but not officially announced in the inside of housing 70.Truss 73 provides support structure to housing 70 and allows housing 70 to support each SCR parts 22 in SCR parts 22.Cross member 75 can also be located between truss 73.Be similar to truss 73, cross member 75 also provides support structure to housing 70.

Housing 70 supports to nine SCR parts 22 of array.Although there is shown nine SCR parts 22, should be appreciated that when not deviating from the scope of the present disclosure, can at the SCR parts 22 of housing 70 inner support arbitrary number.SCR parts 22 can be shaped as cylindrical shape, but it is contemplated that the arbitrary configuration of SCR parts 22.

Housing 70 can be arranged between entrance Tapered Cup 72 and outlet Tapered Cup 74.Entrance Tapered Cup 72 comprises flange 76 that is corresponding with the flange 78 of housing 70 and that be connected with the flange 78 of housing 70 via bolt.Outlet taper 74 can comprise flange 80 that is corresponding with another flange 82 of housing 70 and that be connected with another flange 82 described in housing 70 via bolt.That this configuration achieves rigidity and the exhaust gas treatment components 20 of gas tight seal.

As illustrated best in Fig. 5, housing 70 can comprise inlet side 84 and outlet side 86.Inlet side 84 can be positioned with particulate matter and disperse device 88 (being hereafter referred to as " dust-blowing device ").Dust-blowing device 88 is designed to and can operates into spray pressurized air towards SCR parts 22, disperses out with the particulate matter that may be accumulated in any deposition on SCR parts 22.Dust-blowing device 88 comprises multiple array 90 be made up of nozzle pipeline 92, and each nozzle pipeline 92 includes for spraying compressed-air actuated multiple nozzle 94 towards exhaust SCR parts 22.Nozzle pipeline 92 can be formed by any other materials comprising aluminium, steel, the various metallic material of copper or those skilled in the art known.Housing 70 can comprise the multiple apertures (not being illustrated) allowing nozzle pipeline 92 to pass.In order to nozzle pipeline 92 is fastened on aperture place, a component 98 and packing ring 100 can be used.

Although expect and preferably disperse particulate matter and/or soot in the surface of SCR parts 22, should be appreciated that the disclosure should not be confined to this.On the contrary, should be appreciated that the disclosure is also provided with to be designed to prevent particulate matter and/or soot to be accumulated in the dust-blowing device 88 of the position except the surface of SCR parts 22.More particularly, particulate matter and/or soot may be accumulated in the position except the surface of SCR parts 22.If too much particulate matter and/or soot are accumulated in these " dead angle " places between SCR parts 22, then piled up particulate matter and/or soot finally may come off and block SCR parts 22.Therefore, should be appreciated that when not deviating from the scope of the present disclosure, pressurized air is sprayed in the position that nozzle 94 can be positioned between SCR parts 22.

Referring now to Fig. 4, Fig. 6 and Fig. 7 to Fig. 9, will describe according to exhaust gas treatment components installation system of the present disclosure.Housing 70 can comprise a pair baffle plate 102a and 102b to support each SCR parts 22.Baffle plate 102a and 102b can be soldered to the internal surface 104 of housing 70 and comprise multiple through hole 106 (Fig. 9), and the size of through hole 106 is set to receive SCR parts 22.Each SCR parts 22 include the tank 108 of accommodating SCR substrate 110.Between tank 108 and SCR substrate 110, isolation pad 112 can be set.

In order to be fixed between baffle plate 102a and baffle plate 102b by tank 108, multiple restricting means 114 can be used.Restricting means 114 can be linear (such as plane) component be welded between baffle plate 102a and baffle plate 102b.Alternatively, restricting means 114 can be L shape cross section (Fig. 7).In any case, as illustrated best in Fig. 9, restricting means 114 be all positioned at least partially relative to tank 108 with the angled α in surface 116 that extends of the axis A parallel of SCR parts 22 ground.Angle [alpha] can be in 1 degree (containing 1 degree) in the scope of 20 degree (containing 20 degree).Preferably, angle [alpha] is in 5 (containing 5 degree) degree in the scope of 15 degree (containing 15 degree).More preferably, angle [alpha] is in the scope of 5 (containing 5 degree) degree (containing 5 degree) to 10 degree (containing 10 degree).

116 angled relative to surface at least partially due to restricting means 14, therefore when SCR parts 22 are inserted in housing 70, restricting means 114 will abut tank 108 at first end 118 place.Once restricting means 114 abuts tank 108, then the radial motion of SCR parts 22 is just prevented from.Fig. 7 and Fig. 9 shows abutting between restricting means 114 with tank 108.In addition, during being inserted into by tank in housing 70, abutting between restricting means 114 with tank 108 is assisted and is positioned between baffle plate 102a and 102b by tank.

After tank 108 abuts restricting means 114, the second end 102 of tank 108 can be fixed by connecting ear component 122 via bolt.Ear component 122 can be welded onto the component of the independent formation of the second end 120 of tank 108.Alternatively, tank 108 can be provided with the radial flange (not being illustrated) extended at the second end 120 place.In any case ear component 122 is all to operate into receiving fastening piece 124, ear component 122 and tank 108 are connected to baffle plate 102b by fastening piece 124.As illustrated best in Fig. 4 to Fig. 6, four restricting meanss 144 (as represented by ears 122) can be used to be fixed between baffle plate 102a and 102b by tank 108.But, should be appreciated that when not deviating from the scope of the present disclosure, the restricting means 114 of more or less number can be used.

Because the first end 118 of restricting means 114 pairs of tanks 108 is fixed, therefore non-essential by the first end 118 of tank 108 via being bolted to baffle plate 102a.Enable tank 108 can be inserted into housing 107 and improve from the easness that housing 107 is removed.More particularly, if any SCR parts 22 in SCR parts 22 need repairing, only need removal of fastener 124 to take out SCR parts 122 from housing 70.All to be connected via bolt with the second end 120 at first end 118 compared to SCR parts 22 or to be soldered to the configuration of baffle plate 102a and 102b, this dramatically reduces maintenance consuming time.Remove SCR parts 22 in order to auxiliary from housing 70, ear component 122 can comprise aperture 123, and the instrument (not being illustrated) pulling out SCR parts 22 in order to assist operator from housing 70 can be received in aperture 123.

Provide the aforementioned description of mode of execution for the purpose of illustration and description.These describe and are not intended to the exhaustive or restriction disclosure.Each element of particular implementation or feature are not limited to this particular implementation usually, but in situation applicatory, be can exchange or can be used in selected mode of execution, even also like this when not illustrating particularly or describing.Each element of particular implementation or feature can also change in many ways.These modification are not thought to deviate from mutually with the disclosure, but all remodeling so is all intended to be included in the scope of the present disclosure.

Claims

1. an exhaust aftertreatment components, comprising:

Housing;

Be positioned at isolated a pair baffle plate of described housing;

Tank, described tank comprises the pump-down process substrate be positioned between described a pair baffle plate, and described tank comprises first end and the second end; And

Multiple restricting means, described multiple restricting means is fixed between described a pair baffle plate to be positioned between described baffle plate by described tank, each restricting means at least comprises it relative to the angled part of the outer surface of described tank, makes the end of described restricting means abut the described outer surface of described tank at described first end place and stop the radial motion of described tank.

2. exhaust gas treatment components according to claim 1, wherein, the second end of described tank is via the baffle plate be bolted in described baffle plate.

3. exhaust gas treatment components according to claim 1, wherein, described pump-down process substrate is SCR substrate.

4. exhaust gas treatment components according to claim 1, also comprises the particulate matter being positioned at described housing and disperses device.

5. exhaust gas treatment components according to claim 4, wherein, described particulate matter disperses device and comprises multiple nozzle pipeline, and each nozzle pipeline comprises the multiple nozzles for being deposited on the suprabasil particulate matter of described pump-down process and dispersing out.

6. exhaust gas treatment components according to claim 1, wherein, is supported with into multiple tanks of array between described baffle plate.

7. exhaust gas treatment components according to claim 6, wherein, each tank is corresponding with the multiple restricting meanss be positioned between described baffle plate by described tank.

8. exhaust gas treatment components according to claim 1, wherein, described restricting means abuts described tank at the inlet side place of described housing.

9. exhaust gas treatment components according to claim 1, wherein, the described part of described restricting means is angled relative to the described outer surface of described tank to the angle [alpha] in the scope of 20 degree (containing 20 degree) to be in 1 degree (containing 1 degree).

10. exhaust gas treatment components according to claim 9, wherein, α is in 5 degree (containing 5 degree) in the scope of 15 degree (containing 15 degree).

11. exhaust gas treatment components according to claim 10, wherein, α is in 5 degree (containing 5 degree) in the scope of 10 degree (containing 10 degree).

12. 1 kinds of engine exhaust after-treatment systems, comprising:

Exhaust passage;

The exhaust gas treatment components housing be connected with described exhaust passage;

Be positioned at isolated a pair baffle plate of described housing;

Be positioned at the multiple exhaust gas treatment devices between described a pair baffle plate, each exhaust gas treatment device comprises tank;

Multiple restricting means, described multiple restricting means is fixed between described a pair baffle plate to be positioned between described baffle plate by each tank in described tank, each restricting means at least comprises it relative to the angled part of the outer surface of described tank, makes the end of described restricting means locate the outer surface of described tank at the first end place of described tank and stop the radial motion of described tank; And

Dust-blowing device, described dust-blowing device to be positioned in described housing and to be positioned at the upstream of described exhaust gas treatment device, and described dust-blowing device is for dispersing out the particulate matter on each exhaust gas treatment device be deposited in described exhaust gas treatment device.

13. exhaust after treatment system according to claim 12, wherein, the second end of described tank is via the baffle plate be bolted in described baffle plate.

14. exhaust after treatment system according to claim 12, wherein, described exhaust gas treatment device comprises SCR substrate separately.

15. exhaust after treatment system according to claim 12, wherein, described dust-blowing device comprises multiple nozzle pipeline, and each nozzle pipeline comprises multiple nozzle.

16. exhaust after treatment system according to claim 12, wherein, described restricting means abuts described tank at the inlet side place of described housing.

17. exhaust after treatment system according to claim 12, wherein, the described part of described restricting means is angled relative to the described outer surface of described tank to the angle [alpha] in the scope of 20 degree (containing 20 degree) to be in 1 degree (containing 1 degree).

18. exhaust after treatment system according to claim 12, also comprise bypass tube, and described bypass tube guides exhaust to walk around described exhaust gas treatment components housing.

19. exhaust after treatment system according to claim 18, wherein, are provided with the first valve in described bypass tube, and are positioned with the second valve in the ingress of described exhaust gas treatment components housing.

20. exhaust gas treatment components systems according to claim 19, wherein, when described first valve is opened, described second valve cuts out.