CN107376645A

CN107376645A - Exhaust treatment system

Info

Publication number: CN107376645A
Application number: CN201710447338.5A
Authority: CN
Inventors: 王如双; 郑天玉; 马里奥·阿泰托
Original assignee: Beijing Foton Daimler Automobile Co Ltd
Current assignee: Beijing Foton Daimler Automobile Co Ltd
Priority date: 2017-06-14
Filing date: 2017-06-14
Publication date: 2017-11-24

Abstract

The invention discloses a kind of exhaust treatment system, exhaust treatment system includes：Tail gas collecting device, tail gas collecting device are used to collect tail gas；Vent gas treatment pipeline, the inlet end of vent gas treatment pipeline are connected with the outlet side of tail gas collecting device；Temperature compensation unit, temperature compensation unit are located on vent gas treatment pipeline；Catalytic oxidation unit, SCR unit, catalytic oxidation unit and SCR unit, which are sequentially connected in series, to be located in vent gas treatment pipeline；Reducing agent feeding unit, the outlet of reducing agent feeding unit are located at the front side of SCR unit with vent gas treatment pipeline communication and connectivity part；Control unit, control unit are connected with temperature compensation unit and reducing agent feeding unit.The exhaust treatment system of the present invention, can easily focus on the tail gas of engine emission, and secondary pollution will not be produced in processing procedure, during long-term use, only need to supplement reducing agent, and use cost is low, easily operated with safeguarding.

Description

Exhaust treatment system

Technical field

The invention belongs to tail gas disposal technique field, in particular to a kind of exhaust treatment system.

Background technology

Motor exhaust is a big principal element of air pollution, and for car engine engineer's workshop, it was being produced In journey on each stand engine continuous work, caused by pollute more prominent, pollution of the environmental administration to enginepiston Considerable limitation has been made in thing discharge.

In correlation technique, the equipment for treating engine tail gas of main flow is Dual alkali and chemical method, wherein the former nitrogen oxidation Thing detergent power is relatively low, and equipment can produce the pollution sources such as harmful waste water, used heat, and the latter is located using chemicals such as strong acid more Waste gas is managed, it is with high costs, it is necessary to be separately provided memory space, and generation secondary pollution for hazardous chemical.

Just because of these problems, the equipment for treating engine tail gas in correlation technique is not suitable for engine and vehicle producer Daily operation operation, most car engine engineer's workshop is caused to be unwilling to increase after tail gas treatment device or equipment installation not by will Ask and start, so as to add difficulty to environmental improvement work.

The content of the invention

It is contemplated that at least solves one of technical problem present in prior art.Therefore, the present invention proposes a kind of tail Gas processing system, the exhaust treatment system can efficiently and safely focus on the tail gas of engine emission.

Exhaust treatment system according to embodiments of the present invention, including：Tail gas collecting device, the tail gas collecting device are used for Collect tail gas；Vent gas treatment pipeline, the inlet end of the vent gas treatment pipeline are connected with the outlet side of the tail gas collecting device； Temperature compensation unit, the temperature compensation unit are located on the vent gas treatment pipeline；Catalytic oxidation unit, selective catalysis are also Former unit, the catalytic oxidation unit and the SCR unit, which are sequentially connected in series, is located at the vent gas treatment pipeline It is interior；Reducing agent feeding unit, the outlet of the reducing agent feeding unit are located at the vent gas treatment pipeline communication and connectivity part The front side of the SCR unit；Control unit, described control unit and the temperature compensation unit and it is described also Former agent feeding unit is connected.

Exhaust treatment system according to embodiments of the present invention, the tail gas of engine emission can be easily focused on, located It is low to manage efficiency high, energy consumption, and secondary pollution will not be produced in processing procedure, potential safety hazard is small, during long-term use, Reducing agent only need to be supplemented, use cost is low, easily operated with safeguarding, its NO_XEfficiency is eliminated up to more than 90%-95%.

Exhaust treatment system according to an embodiment of the invention, the reducing agent feeding unit include：Urea supply dress Put and be connected with urea playpipe, the urea device for supplying with the urea playpipe, the ejection section of the urea playpipe is stretched Enter the vent gas treatment pipeline and positioned at the front side of the SCR unit.

Preferably, the axial direction of the ejection section is put down with the axial direction at the vent gas treatment pipeline where the ejection section OK, the ejection section perisporium is provided with the nozzle of multiple settings spaced apart.

Further, the urea playpipe is multiple, and multiple urea playpipes are along the vent gas treatment pipeline It is circumferentially-spaced to open arrangement, so that multiple ejection sections circumferentially spaced arrangement in the vent gas treatment pipeline.

Preferably, be provided with flow mixing device in the vent gas treatment pipeline, the flow mixing device installed in the ejection section with it is described Between the import of SCR unit.

Exhaust treatment system according to an embodiment of the invention, in addition to：Oxygen device for supplying, the oxygen supply dress The outlet put is connected with the vent gas treatment pipeline and junction is located at the front side of the temperature compensation unit.

Exhaust treatment system according to an embodiment of the invention, described control unit include：Controller and sensor, institute Controller is stated with the sensor to be connected to control the temperature compensation unit or described according to the signal of the sensor feedback Reducing agent feeding unit.

Exhaust treatment system according to an embodiment of the invention, in addition to：Blower fan, the import of the blower fan and the tail Gas disposal pipeline is connected；Chimney, the chimney are connected with the outlet of the blower fan；Wherein, the blower fan and described control unit Electrical connection, and be arranged to stop supply tail gas and reducing agent feeding unit stopping supply reduction in the tail gas collecting device Shut down after the blower fan work scheduled time is controlled during agent.

Exhaust treatment system according to an embodiment of the invention, the vent gas treatment pipeline include：Inlet manifold, parallel connection Main pipeline and by-pass line, exhaust main, one end of the inlet manifold is connected with the outlet side of the tail gas collecting device, The other end is connected with the inlet end of the main pipeline and the inlet end of the by-pass line, the temperature compensation unit, described urges Change oxidation unit and the SCR unit to be each provided on the main pipeline, the outlet side of the main pipeline and described The outlet side of by-pass line is connected with the exhaust main, and the main pipeline is provided with maintenance valve, and the by-pass line is provided with Bypath valve.

Exhaust treatment system according to an embodiment of the invention, the vent gas treatment pipeline also include：First branch pipe, institute State the first branch pipe with the main pipeline to be connected, and junction, positioned at the rear side of the maintenance valve, first branch pipe is provided with normal The first relief valve opened；Second branch pipe, second branch pipe are connected with the exhaust main, and second branch pipe is provided with normally closed The second relief valve.

The additional aspect and advantage of the present invention will be set forth in part in the description, and will partly become from the following description Obtain substantially, or recognized by the practice of the present invention.

Brief description of the drawings

The above-mentioned and/or additional aspect and advantage of the present invention will become in the description from combination accompanying drawings below to embodiment Substantially and it is readily appreciated that, wherein：

Fig. 1 is the structure principle chart of exhaust treatment system according to embodiments of the present invention；

Fig. 2 is that the structural representation of tail gas collecting device according to embodiments of the present invention (shows vent gas treatment pipeline etc. Part)；

Fig. 3 be I in Fig. 2 at partial enlarged drawing；

Fig. 4 and Fig. 5 is that the structural representation of vent gas treatment pipeline according to embodiments of the present invention (shows temperature-compensating list The parts such as member)；

Fig. 6 is the structural representation that urea playpipe according to embodiments of the present invention coordinates with flow mixing device；

Fig. 7 and Fig. 8 is the structural representation of urea playpipe according to embodiments of the present invention；

Fig. 9 be exhaust gas processing device according to embodiments of the present invention structural representation (mainly show lower floor's accommodating chamber and Upper strata accommodating chamber)；

Figure 10 is the structural representation on the floor of upper strata accommodating chamber according to embodiments of the present invention；

Figure 11 is the structural representation of catalytic reaction cell according to embodiments of the present invention；

Figure 12 is the half-section diagram of catalytic reaction cell according to embodiments of the present invention；

Figure 13 is the end view of catalytic reaction cell according to embodiments of the present invention.

Reference：

Exhaust treatment system 1000,

Tail gas collecting device 100, bye-pass 110, first paragraph 111, second segment 112, bellows 112a, the 3rd section 113, cone Shape open-mouth section 113a, the 4th section 114, pressure-regulating valve 115, sensor connector 116, stop valve 117, fire-fighting response stop valve 118, muffler 119 collects pipeline 120, discharge 121, delivery pipe 122,

Vent gas treatment pipeline 200, inlet manifold 210, the first branch pipe 211, the first relief valve 211a, electronic total valve 212, Main pipeline 220, valve 221 is overhauled, by-pass line 230, bypath valve 231, exhaust main 240, the second branch pipe 241, second lets out Pressure valve 241a, blower fan 250, chimney 260,

Temperature compensation unit 300, catalytic oxidation unit 400, SCR unit 500,

Reducing agent feeding unit 600, urea device for supplying 610, air purifier 611, urea tank 612, urea pump 613, Urea playpipe 620, sucting 621, mixing unit 622, linkage section 623, ejection section 624, nozzle 625, jeting area 626, mix Stream device 630, flow deflector 631,

Control unit 700, controller 710, temperature sensor 721, lambda sensor 722, pressure sensor 723, NO_xConcentration Sensor 724, flow sensor 725, differential pressure pickup 726, liquid level sensor 727；

Lower floor's accommodating chamber 810, lower vent window 811, upper strata accommodating chamber 820, the first portable plate 821, the second portable plate 822, 3rd portable plate 823, upper vent window 824, cat ladder mouth 825, inspection platform 830, overhaul cat ladder 831；

Catalytic reaction cell 900, the first joint 910, main cylinder 920, preparation section 921, linkage section 922, principal piece 923 are main Loading area 924, preparation loading area 925, the second joint 930, truncated rectangular pyramids section 941, cylindrical segment 942.

Embodiment

Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached The embodiment of figure description is exemplary, is only used for explaining the present invention, and is not considered as limiting the invention.

In the description of the invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outer ", " axial direction ", The orientation or position relationship of the instructions such as " radial direction ", " circumference " are based on orientation shown in the drawings or position relationship, merely to just In the description present invention and simplify description, rather than instruction or imply signified device or element must have specific orientation, with Specific azimuth configuration and operation, therefore be not considered as limiting the invention.In addition, define " first ", " second " One or more this feature can be expressed or be implicitly included to feature.In the description of the invention, unless otherwise indicated, " multiple " are meant that two or more.

In the description of the invention, it is necessary to illustrate, unless otherwise clearly defined and limited, term " installation ", " phase Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or be integrally connected；Can To be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected by intermediary, Ke Yishi The connection of two element internals.For the ordinary skill in the art, with concrete condition above-mentioned term can be understood at this Concrete meaning in invention.

Exhaust treatment system 1000 according to embodiments of the present invention, exhaust treatment system are described below with reference to Fig. 1-Fig. 8 1000 vent gas treatments being used in factory building, it is mainly used for the vent gas treatment of engine in enginepiston.

As Figure 1-Figure 8, exhaust treatment system 1000 according to an embodiment of the invention includes：Tail gas collecting device 100th, exhaust gas processing device and control unit 700, exhaust gas processing device includes：Vent gas treatment pipeline 200, temperature compensation unit 300th, catalytic oxidation unit 400, SCR unit 500 and reducing agent feeding unit 600.

Wherein, tail gas collecting device 100 is used to collect tail gas, and the inlet end of tail gas collecting device 100 is suitably connected to survey Engine exhaust port on test stand frame, the inlet end of vent gas treatment pipeline 200 are connected with the outlet side of tail gas collecting device 100, The tail gas of engine discharge is entered back into vent gas treatment pipeline 200 by the collection of tail gas collecting device 100 to be focused on, to increase The efficiency of strong vent gas treatment, reduce the equipment investment of exhaust treatment system 1000.

Temperature compensation unit 300 is located on vent gas treatment pipeline 200, to adjust the temperature of pending tail gas, such as temperature Degree compensating unit 300 can include electric heating tube, electric heating tube can be it is multiple, multiple electric heating tubes can with independent control, with Just the temperature of pending tail gas is preferably adjusted on demand.

Catalytic oxidation unit 400 and SCR unit 500, which are sequentially connected in series, to be located in vent gas treatment pipeline 200, The outlet of reducing agent feeding unit 600 connects with vent gas treatment pipeline 200, and outlet and the tail gas of reducing agent feeding unit 600 The connectivity part of processing pipeline 200 is located at the front side of SCR unit 500.

Along exhaust gas flow direction, temperature compensation unit 300, catalytic oxidation unit 400 and SCR unit 500 are sequentially arranged, corresponding catalyst is mounted with catalytic oxidation unit 400 and is used for catalysis oxidation partial reductive material, choosing Selecting property catalytic reduction unit 500 is then used to optionally reduce NO_X。

For example catalytic oxidation unit 400 mainly can be made of ceramics, its main purpose is to reduce hydrocarbon (HC), the content of carbon monoxide (CO) and partial particulate thing (PM), especially, catalytic oxidation unit 400 can be effectively catalyzed Dissolved organic matter (SOF) in particulate matter (PM) is oxidized, and dissolved organic matter (SOF) can include polycyclic aromatic hydrocarbons (PAH), second The harmful components that do not limit also of regulation at present such as aldehyde, the oxidant of the oxidation reaction that the stage of catalytic oxidation unit 400 occurs can be with For oxygen, oxygen can derive from the oxygen carried in tail gas or oxygen in mixed air etc..

The related purification equation of catalytic oxidation unit 400 includes：2CO+O₂=2CO₂；SOF+O₂→CO₂+H₂O；2NO+O₂ =2NO₂；C+O₂→CO+CO₂。

Found by many experiments, catalytic oxidation unit 400 can make hydrocarbon reduce 75-90%, and CO reduces 75- 90%, PM reduce 20% or so, and polycyclic aromatic hydrocarbon discharge reduces 60%, and acetaldehyde reduces 70%.Catalytic oxidation unit NO also effectively can be oxidized to NO by the prime of 400 alternatively property catalytic reduction units 500₂, so as to increase selective catalysis The catalytic performance of reduction unit 500.

SCR unit 500, can be with selective and tail gas in the presence of certain temperature and catalyst NO_XReact and generate the N of nontoxic pollution-free₂And H₂O, the reducing agent in course of reaction are supplied by reducing agent feeding unit 600, Reducing agent can be hydrocarbon (such as methane, propylene), NH₃, urea etc..

Control unit 700 is connected with temperature compensation unit 300 and reducing agent feeding unit 600, and control unit 700 can root The supply of the power of temperature compensation unit 300 and reducing agent feeding unit 600 is controlled according to the design parameter of pending tail gas Amount, more fully reacts so that tail gas is more efficient in catalytic oxidation unit 400 and SCR unit 500.

That is, the tail gas of the engine emission on each testboard bay collecting by tail gas collecting device 100, then Enter together in vent gas treatment pipeline 200 and focus on, control unit 700 is according to state modulator temperature such as the temperature of tail gas, flows The power of compensating unit 300 is spent, tail gas is entered after catalytic oxidation unit 400 and SCR unit 500 suitable Reaction temperature, with oxygen oxidation reaction occurs for tail gas in the catalytic oxidation unit 400, and specifically, hydrocarbon is oxidized For CO₂And H₂O, NO are oxidized to NO₂, the tail gas through peroxidization enters back into SCR unit 500 and is reduced agent The reducing agent reduction that feeding unit 600 is supplied, specifically, NO_XReact and generate the N of nontoxic pollution-free₂And H₂O, and reducing agent Quantity delivered is adjustable, and such tail gas is cleaned as non-toxic components, and unharmful substance produces in processing procedure.

Exhaust treatment system 1000 according to embodiments of the present invention, it can easily focus on the tail of engine emission Gas, treatment effeciency is high, energy consumption is low, and secondary pollution will not be produced in processing procedure, and potential safety hazard is small, is used in long-term Cheng Zhong, reducing agent only need to be supplemented, use cost is low, easily operated with safeguarding, its NO_XEfficiency is eliminated up to 90%-95% More than.

Exhaust treatment system 1000 in accordance with a preferred embodiment of the present invention, as shown in Figure 4 and Figure 5, vent gas treatment pipe Road 200 includes：Inlet manifold 210, main pipeline 220 and by-pass line 230, exhaust main 240.

One end of inlet manifold 210 is connected with the outlet side of tail gas collecting device 100, the other end of inlet manifold 210 with The inlet end of main pipeline 220 and the inlet end of by-pass line 230 are connected, and inlet manifold 210 optionally cuts off, main pipeline 220 and by-pass line 230 be connected in parallel between inlet manifold 210 and exhaust main 240, and the inlet end of main pipeline 220 with The outlet side of main pipeline 220 optionally connects, and the outlet side of the inlet end and by-pass line 230 of by-pass line 230 is optional Connect to selecting property, main pipeline 220 is provided with maintenance valve 221, and by-pass line 230 is provided with bypath valve 231, temperature compensation unit 300th, catalytic oxidation unit 400 and SCR unit 500 are each provided on main pipeline 220, the outlet side of main pipeline 220 And the outlet side of by-pass line 230 is connected with exhaust main 240.

It is understood that the inlet end of inlet manifold 210 is connected with the outlet side of tail gas collecting device 100, main pipeline 220 inlet end is connected with the outlet side of inlet manifold 210, the inlet end of by-pass line 230 and the outlet side of inlet manifold 210 It is connected, the outlet side of main pipeline 220 is connected with the inlet end of exhaust main 240, the outlet side of by-pass line 230 and exhaust main 240 inlet end is connected, and the inlet end of main pipeline 220 optionally connects with the outlet side of main pipeline 220, by-pass line 230 inlet end optionally connects with the outlet side of by-pass line 230.

The catalytic oxidation unit 400 and selective catalysis that tail gas catalyzed reaction member can describe including above-described embodiment are also Former unit 500, temperature compensation unit 300 can also be located on main pipeline 220, specifically, along airflow direction, temperature-compensating list Member 300, catalytic oxidation unit 400 and SCR unit 500 can be sequentially arranged on main pipeline 220, and temperature is mended The part that unit 300 is disposed adjacent to the inlet end of main pipeline 220 is repaid, SCR unit 500 can be arranged in and lean on The part of the outlet side of nearly main pipeline 220, catalytic oxidation unit 400 can be arranged in catalytic oxidation unit 400 and selectivity is urged Between change reduction unit 500.

Main pipeline 220 is provided with the first branch pipe 211, and the first branch pipe 211 is provided with the first normally opened relief valve 211a, exhaust main 240 are provided with the second branch pipe 241, and the second branch pipe 241 is provided with the second normally closed relief valve 241a.

First branch pipe 211 has a variety of effects：First, when carrying out tail gas clean-up, the first relief valve 211a is opened, first Pipe 211 is used to be mixed into fresh air, with the oxygen needed for supplement reaction；Second, after the engine on testboard bay is shut down, control is single The electronic total valve 212 of the control of member 700 is closed automatically, the Delayed shutdown scheduled time of blower fan 250, such as 30 minutes, so as to pass through the Tail gas catalyzed reaction member on one branch pipe 211 suction air cooling main pipeline 220 and main pipeline 220；Third, can be first Before processing tail gas is extracted at branch pipe 211, the content applied to each composition in detection tail gas.

Second branch pipe 241 is connected with exhaust main 240, and the second branch pipe 241 is provided with the second normally closed relief valve 241a.The Two branch pipes 241 are mainly for detection of the toxic component content after Tail gas measuring after processing, such as environmental administration's detection vent gas treatment When, without in climbing in such as correlation technique to chimney 260, the second relief valve 241a can be directly opened, at the second branch pipe 241 Sampling, so, sampling process is safer.

When needing cleaning of off-gas, the inlet end of by-pass line 230 is cut off with the outlet side of by-pass line 230, main pipeline 220 connections, the first relief valve 211a are opened, the tail gas that tail gas collecting device 100 is enriched with by main pipeline 220, and with from first The fresh air that branch pipe 211 sucks mixes, and is cleaned in the presence of the tail gas catalyzed reaction member on main pipeline 220, that is to say, that The purified treatment reaction of tail gas mainly occurs in main pipeline 220.

Without or temporarily can not cleaning of off-gas when, such as during service conduits or the tail gas catalyzed reaction of maintenance During unit, the outlet side of the inlet end of main pipeline 220 and main pipeline 220 can be cut off, by-pass line 230 connects, The tail gas that tail gas collecting device 100 is enriched with can so overhaul the same of tail gas catalyzed reaction member by by-pass line 230 When, ensure the normal exhaust of whole pipeline.

Exhaust treatment system 1000 can also include：Blower fan 250 and chimney 260, import and the vent gas treatment pipe of blower fan 250 Road 200 is connected, and chimney 260 is connected with the outlet of blower fan 250, wherein, blower fan 250 electrically connects with control unit 700, and is arranged to The work of blower fan 250 is controlled when tail gas collecting device 100 stops supply tail gas and reducing agent feeding unit 600 stops supply reducing agent Make the scheduled time (such as 30 minutes) to shut down afterwards.

Blower fan 250 to be multiple, the outlet side of exhaust main 240 be it is multiple, each outlet of exhaust main 240 be adapted to One blower fan 250 connects, and blower fan 250 can be connected with control unit 700, by controlling the unlatching number of blower fan 250, can control The flow velocity of tail gas processed, at least one in blower fan 250 can be frequency conversion fan 250, so can be by adjusting single blower fan 250 Power adjust the flow velocity of tail gas so that the reaction efficiency phase of the flow velocity of tail gas and tail gas catalyzed reaction member inner exhaust gas Match somebody with somebody.

As shown in Fig. 2 stop valve 117 can be equipped with the branch road at each place of blower fan 250, do not opened in the blower fan 250 When dynamic, corresponding stop valve 117 is closed, and to prevent tail gas from driving blower fan 250 to rotate, stop valve 117 can be electric-controlled type, and with Control unit 700 is connected.

Alternatively, the vent gas treatment pipeline 200 of the embodiment of the present invention can also include：Chimney 260, chimney 260 be suitable to The outlet of blower fan 250 is connected, and chimney 260 can be made up of stainless steel, and the height of chimney 260 and the internal diameter of chimney 260 can roots Determined according to the number of testboard bay and the exhaust emissions amount of engine, ensure the engine standard-sized sheet on all testboard bays, And tail gas, when being circulated with predetermined peak flow rate (PFR) (such as 8m/s), chimney 260 can effectively discharge fume.

As Figure 1-Figure 8, exhaust treatment system 1000 according to an embodiment of the invention includes：Tail gas collecting device 100th, vent gas treatment pipeline 200, vent gas treatment pipeline 200 are used to connect tail gas treatment device, such as the He of catalytic oxidation unit 400 SCR unit 500, as shown in Figures 2 and 3, tail gas collecting device 100 include：Collect pipeline 120 and multiple Pipeline 110.

Wherein, the entrance point of each bye-pass 110 is adapted to be connected with the engine exhaust port on corresponding testboard bay, The number of bye-pass 110 can be identical with the number of the testboard bay in factory building, and multiple bye-passes 110 and multiple testboard bays Correspond, the port of export of each bye-pass 110 is connected with collecting the entrance point of pipeline 120, collects the port of export of pipeline 120 It is connected with the entrance point of vent gas treatment pipeline 200, pressure-regulating valve 115 is equipped with each bye-pass 110.

It is understood that the engine on each testboard bay passes through the collection of each bye-pass 110, then it is pooled to Collect pipeline 120, concentrated by collecting pipeline 120 and be transported in vent gas treatment pipeline 200 and purified, can so reduce tail gas The arrangement quantity of processing equipment, the hall space that exhaust treatment system 1000 takes is reduced, and pressure-regulating valve 115 can be effective Ground controls tail gas collecting device 100 to be maintained at the pressure of the exhaust port of engine the suction of engine exhaust emission Suitable test value, that is to say, that the suction of tail gas collecting device 100 does not influence the test accuracy of engine.

Exhaust treatment system 1000 according to embodiments of the present invention, by by the tail gas of the engine on each testboard bay The mode being uniformly processed again is enriched with, can effectively strengthen the treatment effeciency of exhaust treatment system 1000, and exhaust treatment system 1000 do not influence the pressure at expulsion of engine.

The exhaust collection that the exhaust treatment system 1000 of the embodiment of the present invention can also include any one following embodiment fills Put 100.

The exhaust treatment system 1000 of the embodiment of the present invention can also include the vent gas treatment pipe of any one following embodiment Road 200.

The vent gas treatment that the exhaust treatment system 1000 of the embodiment of the present invention can also include any one following embodiment fills Put.

The exhaust treatment system 1000 of the embodiment of the present invention can also include the urea mixed flow knot of any one following embodiment Structure.

The tail gas that exhaust treatment system 1000 according to embodiments of the present invention is further described below with reference to Fig. 2 and Fig. 3 is received Acquisition means 100.

Exhaust treatment system 1000 can also include blower fan 250, and blower fan 250 is connected with vent gas treatment pipeline 200, such as wind Machine 250 can be connected with the port of export of vent gas treatment pipeline 200, and blower fan 250 can provide the suction of exhaust gas flow, prevent tail gas Pour in down a chimney.

Exhaust treatment system 1000 in accordance with a preferred embodiment of the present invention, as shown in figure 3, bye-pass 110 include according to Secondary connected first paragraph 111 and second segment 112, one end of the remote second segment 112 of first paragraph 111 is suitable to and engine exhaust port It is connected, one end of remote the first paragraph 111 of second segment 112 with collecting the entrance point of pipeline 120 suitable for being connected, it is necessary to illustrate It is that connection described herein can be to be directly connected to, or be indirectly connected with.

As shown in figure 3, pressure-regulating valve 115 is located on first paragraph 111, pressure-regulating valve 115 can adjust the pressure of front end Power, prevent air-breathing from influenceing engine, pressure-regulating valve 115 can be electrically-controlled valve.

As shown in figure 3, first paragraph 111 is also provided with：Sensor connector 116, the both ends of sensor connector 116 can lead to Cross flange to be connected on first paragraph 111, and sensor connector 116 is located at the rear end of pressure-regulating valve 115, sensor connector 116 Provided with the installation position for install sensor, sensor can be so conveniently inserted, sensor can be used for detecting tail gas Discharge pressure or composition etc..

Further, as shown in Figures 2 and 3, the tail gas collecting device 100 can also include stop valve 117, stop valve 117 are connected between first paragraph 111 and second segment 112, for example first paragraph 111 and second segment 112 can pass through the phase of stop valve 117 Even, specifically, stop valve 117 can be butterfly valve, optionally to cut off the front and back end of tail gas collecting device 100, such as When changing on engine stop work or testboard bay on testboard bay without engine, stop valve 117 is operated, makes first paragraph 111 are cut off with second segment 112, and air will not be sucked at the first paragraph 111.

Preferably, at least a portion of second segment 112 is bellows 112a.It is understood that first paragraph 111 and second Section 112 can be connected by ring flange, and at least a portion of second segment 112 is designed as into bellows 112a, on the one hand can be dropped It the mount stress of low pipeline, on the other hand can play a part of vibration damping, prevent the operational vibration of invention machine to be delivered to tail backward Gas processing system 1000, another further aspect, in the case where length is certain, bellows 112a surface area is big, contributes to engine Exhaust radiating,

Preferably, as shown in figure 3, bye-pass 110 can also include：3rd section 113, second segment 112 can pass through the 3rd Section 113 is connected with collecting pipeline 120, and the 3rd section of 113 one end being connected with second segment 112 have taper open-mouth section 113a, taper Open-mouth section 113a is located at outside second segment 112, and is in communication with the outside.

It is understood that the 3rd section 113 is connected with second segment 112 and non-tight, when the power of blower fan 250 is excessive, Taper open-mouth section 113a open-mouth can prevent from having an impact the pressure of the front end of pressure-regulating valve 115 from extraneous air-breathing.

With reference to figure 3, one end of the 3rd section 113 of remote second segment 112 is provided with fire-fighting response stop valve 118, fire-fighting response Stop valve 118 can be motor-driven valve.It is understood that when catching fire, fire-fighting response stop valve 118 can close automatically, prevent Only it is evacuated combustion-supporting, and is closed when the testboard bay does not work, prevent that the fresh air of suction is excessive.

With reference to figure 3, bye-pass 110 can also include：4th section 114, the 3rd section 113 passes through the 4th section 114 and manifold trunk Road 120 connects, and the 4th section 114 is provided with muffler 119, and muffler 119 is used to reduce pneumatic noise, reduces the gas in factory building Make an uproar.

In some preferred embodiments, meet：S1 ＜ S2 ＜ S3 ＜ S4, wherein, S1 is the flow area of first paragraph 111 Product, S2 are the actual internal area of second segment 112, and S3 is the 3rd section 113 of actual internal area, and the circulation that S4 is the 4th section 114 is cut Area.First paragraph 111, second segment 112, the 3rd section 113, the 4th section 114 can be respectively provided with circular ring section, and can be steel Pipe is made, for example first paragraph 111 can be made up of a diameter of 150mm steel pipe, and second segment 112 can be for a diameter of 200mm's Steel pipe is made, and the 3rd section 113 can be made up of a diameter of 250mm steel pipe, and the 4th section 114 can be a diameter of 300mm steel Pipe is made.

Exhaust treatment system 1000 in accordance with a preferred embodiment of the present invention, can be with as shown in Fig. 2 collecting pipeline 120 Including discharge 121 and delivery pipe 122, multiple bye-passes 110 are divided to for two groups of both sides for being arranged in discharge 121, and often Length direction of the multiple bye-passes 110 along discharge 121 in group is spaced apart to be connected with discharge 121, the import of delivery pipe 122 End is connected with the middle part of discharge 121, and the port of export of delivery pipe 122 is connected with the entrance point of vent gas treatment pipeline 200.This Sample, the distance of the entrance point of each bye-pass 110 to vent gas treatment pipeline 200 is more balanced, the tail gas on each testboard bay Collection efficiency is more consistent.

Further, temperature compensation unit 300, catalytic oxidation unit 400 and choosing are sequentially provided with vent gas treatment pipeline 200 Selecting property catalytic reduction unit 500.Temperature compensation unit 300 is used for the temperature for adjusting pending tail gas, catalytic oxidation unit 400 Effectively the dissolved organic matter (SOF) in catalysed particulate thing (PM) it can be oxidized, SCR unit 500 is one , can be with the selective NO with tail gas in the presence of constant temperature degree and catalyst_XReact and generate the N of nontoxic pollution-free₂And H₂O。

Vent gas treatment pipeline 200 according to an embodiment of the invention is described below with reference to Fig. 1, Fig. 4 and Fig. 5.

As shown in Figure 1, Figure 4 and Figure 5, vent gas treatment pipeline 200 according to an embodiment of the invention includes：Main pipeline 220th, by-pass line 230, exhaust main 240, main pipeline 220 and by-pass line 230 are connected in parallel, and the air inlet of main pipeline 220 End is connected with the outlet side of tail gas collecting device 100, the inlet end of by-pass line 230 and the outlet side of tail gas collecting device 100 It is connected, the outlet side of main pipeline 220 is connected with the inlet end of exhaust main 240, the outlet side of by-pass line 230 and exhaust main 240 inlet end is connected, and the inlet end of main pipeline 220 optionally connects with the outlet side of main pipeline 220, by-pass line 230 inlet end is optionally connected with the outlet side of by-pass line 230, and it is tail gas catalyzed anti-that installation is suitable on main pipeline 220 Unit is answered, the outlet side of exhaust main 240 is suitable to be connected with the suction inlet of blower fan 250.

It is understood that tail gas catalyzed reaction member can include the catalytic oxidation unit 400 of above-described embodiment description With SCR unit 500, temperature compensation unit 300 can also be located on main pipeline 220, specifically, along air-flow Direction, temperature compensation unit 300, catalytic oxidation unit 400 and SCR unit 500 can sequentially be arranged in supervisor On road 220, temperature compensation unit 300 is disposed adjacent to the part of the inlet end of main pipeline 220, SCR unit 500 can be disposed adjacent to the part of the outlet side of main pipeline 220, and catalytic oxidation unit 400 can be arranged in catalysis oxidation list Between member 400 and SCR unit 500.

When needing cleaning of off-gas, the inlet end of by-pass line 230 is cut off with the outlet side of by-pass line 230, main pipeline 220 connections, the tail gas that tail gas collecting device 100 is enriched with is by main pipeline 220, and the tail gas catalyzed reaction on main pipeline 220 It is cleaned in the presence of unit, that is to say, that the purified treatment reaction of tail gas mainly occurs in main pipeline 220.

Vent gas treatment pipeline 200 according to embodiments of the present invention, can carry out the switching of multiple-working mode, and pipeline and The maintenance of equipment on pipeline does not influence the normal production in workshop.

As shown in Figure 1, Figure 4 and Figure 5, vent gas treatment pipeline 200 according to an embodiment of the invention includes：Inlet manifold 210th, it is total that main pipeline 220, by-pass line 230, exhaust main 240, main pipeline 220 and by-pass line 230 are connected in air inlet in parallel Between pipe 210 and exhaust main 240, and the inlet end of main pipeline 220 optionally connects with the outlet side of main pipeline 220, The inlet end of by-pass line 230 optionally connects with the outlet side of by-pass line 230, and main pipeline 220 is provided with the first branch pipe 211, the first branch pipe 211 is provided with the first normally opened relief valve 211a, and exhaust main 240 is provided with the second branch pipe 241, the second branch pipe 241 are provided with the second normally closed relief valve 241a, are suitable to install tail gas catalyzed reaction member on main pipeline 220.

Vent gas treatment pipeline 200 according to embodiments of the present invention, can carry out the switching of multiple-working mode, and pipeline and The maintenance of equipment on pipeline does not influence the normal production in workshop, tail gas before treatment after safety easy to detect.

Vent gas treatment pipeline 200 according to embodiments of the present invention is further described below with reference to Fig. 1, Fig. 4 and Fig. 5.

Vent gas treatment pipeline 200 in accordance with a preferred embodiment of the present invention can also include：Inlet manifold 210, supervisor Road 220 and by-pass line 230 are connected by inlet manifold 210 with the outlet side of tail gas collecting device 100, and inlet manifold 210 Provided with electronic total valve 212.

The inlet end of inlet manifold 210 can be connected with the outlet side of tail gas collecting device 100, specifically, inlet manifold 210 inlet end can be connected with the port of export of delivery pipe 122.

Electronic total valve 212 can be connected with control unit 700, when the engine on each testboard bay is all shut down Or when all without engine, control unit 700 can control electronic total valve 212 to close, and make whole vent gas treatment pipeline 200 It is cut off with tail gas collecting device 100, prevents chimney 260 and flue from remaining poisonous tail gas " pouring in down a chimney ".

As shown in Figure 4 and Figure 5, main pipeline 220 is provided with maintenance valve 221, and maintenance valve 221 can be located at tail gas catalyzed anti- The front of unit is answered, by-pass line 230 is provided with bypath valve 231, and it can be manual to overhaul valve 221 and bypath valve 231 Valve.

When needing cleaning of off-gas, maintenance valve 221 is in opening, and bypath valve 231 is closed；In nothing When needing cleaning of off-gas, maintenance valve 221 is closed, and bypath valve 231 is in opening；It should be noted that valve Door in opening represent corresponding to pipeline be in connected state, valve be closed representing corresponding to pipeline in cutting Disconnected state.

Further, tail gas catalyzed reaction can be distinguished with least two, and two maintenance valves 221 by overhauling valve 221 The front and back of unit.So, when without cleaning of off-gas, it can prevent tail gas from pouring into tail gas catalyzed reaction member from both ends.

Vent gas treatment pipeline 200 in accordance with a preferred embodiment of the present invention, as shown in Figure 4 and Figure 5, vent gas treatment pipeline 200 can also include：First branch pipe 211 and the second branch pipe 241.

Wherein, the first branch pipe 211 is connected with main pipeline 220, and the junction of the first branch pipe 211 and main pipeline 220 is located at Overhaul between valve 221 and tail gas catalyzed reaction member, wherein the maintenance valve 221 is located at tail gas catalyzed reaction member and supervisor Between the inducer in road 220, that is to say, that the junction of the first branch pipe 211 and main pipeline 220 is located at temperature compensation unit 300 Entrance point and upstream maintenance valve 221 between, the junction of the first branch pipe 211 and main pipeline 220 can be adjacent to front end Maintenance valve 221 rear side, the first branch pipe 211 is provided with the first normally opened relief valve 211a.

Alternatively, the open end of the first branch pipe 211 and the second branch pipe 241 is down.Thus, it is possible to prevent dust and other impurities Drop into pipeline.

As shown in Figure 4 and Figure 5, exhaust main 240 can be T-shaped, and relative two inlet end of exhaust main 240 is distinguished It is connected with the outlet side of main pipeline 220 and by-pass line 230, the other end of exhaust main 240 is outlet side, and exhaust main 240 outlet side is connected with the suction inlet of blower fan 250.

Vent gas treatment pipeline 200 in accordance with a preferred embodiment of the present invention, main pipeline 220, by-pass line 230, exhaust House steward 240 is all covered with heat-insulating, fire-preventing set outside, and vent gas treatment pipeline 200 is arranged indoors, for example can be arranged in container and be built Into factory building in, due to being passed through in pipeline as high-temperature tail gas, and heated provided with temperature compensation unit 300, heat-insulating, fire-preventing Set can effectively reduce the heat radiation of pipeline, reduce the temperature in factory building, and prevent that high temperature is on fire.Specifically, heat-insulating, fire-preventing set Rock wool layer, glass layer and aluminum layer from inside to outside can be included, rock wool layer and glass layer can play heat-insulated Effect, rock wool layer, glass layer and aluminum layer can play fireproof effect, and aluminum layer can prevent rock wool layer, glass fibers The fiber of dimension layer drops, and is easy to build clean power house environment.

Vent gas treatment pipeline 200 in accordance with a preferred embodiment of the present invention, as shown in Figure 4 and Figure 5, exhaust main 240 Outlet side to be multiple, each outlet of exhaust main 240 is adapted to be connected with a blower fan 250.Blower fan 250 can be with control Unit 700 is connected, and by controlling the unlatching number of blower fan 250, can control the flow velocity of tail gas, at least one in blower fan 250 It can be frequency conversion fan 250, so the flow velocity of tail gas can be adjusted by adjusting the power of single blower fan 250, so that tail The reaction efficiency of the flow velocity of gas and tail gas catalyzed reaction member inner exhaust gas matches.

Exhaust gas processing device according to an embodiment of the invention is described below with reference to Fig. 1, Fig. 4-Fig. 8.

As shown in Fig. 1, Fig. 4-Fig. 8, exhaust gas processing device includes：Vent gas treatment pipeline 200, catalytic oxidation unit 400, choosing Selecting property catalytic reduction unit 500 and reducing agent feeding unit 600.

Wherein, the entrance point of vent gas treatment pipeline 200 is connected with the port of export of tail gas collecting device 100, and vent gas treatment Pipeline 200 includes main pipeline 220 and by-pass line 230, and main pipeline 220 and by-pass line 230 are connected in parallel, main pipeline 220 Inlet end optionally connects with the inlet end of outlet side and by-pass line 230 with outlet side, catalytic oxidation unit 400 It is each provided at SCR unit 500 on main pipeline 220, import and the catalysis oxygen of SCR unit 500 The outlet for changing unit 400 is connected, and the outlet of reducing agent feeding unit 600 is connected with the import of SCR unit 500.

It is understood that the inlet end of main pipeline 220 optionally connects with the outlet side of main pipeline 220, bypass The inlet end of pipeline 230 optionally connects with the outlet side of by-pass line 230.

Connected in the inlet end of main pipeline 220 with the outlet side of main pipeline 220 and the inlet end and bypass of by-pass line 230 During the outlet side cut-out of pipeline 230, the tail gas imported from tail gas mobile device enters main pipeline 220, and first by catalysis oxidation list Member 400 is catalyzed, generation oxidation reaction, and the fractions in tail gas are oxidized, such as carbon monoxide (CO), part carbon in tail gas Hydrogen compound (HC), partial particulate thing (PM) part dissolved organic matter (SOF) are oxidized, and catalytic oxidation unit 400 can also NO is oxidized to NO₂。

Tail gas after peroxidization mixes with the reducing agent that reducing agent feeding unit 600 is supplied, and enters selection Property catalytic reduction unit 500, under the catalytic action of catalyst, the NO in reducing agent and tail gas_XReact and generate nontoxic no dirt The N of dye₂And H₂O, the reducing agent in course of reaction are supplied by reducing agent feeding unit 600, and reducing agent can be hydrocarbon (such as methane, propylene), NH₃, urea etc..

When carrying out overhaul of the equipments, the inlet end of main pipeline 220 can be made to be cut off with the outlet side of main pipeline 220, bypass The inlet end of pipeline 230 connects with the outlet side of by-pass line 230, and so, tail gas does not interfere with the maintenance of equipment.

Exhaust gas processing device according to embodiments of the present invention, the tail gas of engine emission can be easily focused on, located It is low to manage efficiency high, energy consumption, and secondary pollution will not be produced in processing procedure, potential safety hazard is small, during long-term use, Reducing agent only need to be supplemented, use cost is low, easily operated with safeguarding, its NO_XEfficiency is eliminated up to more than 90%-95%, And the maintenance of exhaust gas processing device is convenient.

As shown in figure 1, in a preferred embodiment of the invention, exhaust gas processing device can also include：Temperature-compensating Unit 300, temperature compensation unit 300 are located on main pipeline 220, and temperature compensation unit 300 is located at catalytic oxidation unit 400 Front side.Temperature compensation unit 300 is used for the temperature for adjusting pending tail gas, so that corresponding to oxidation reaction and reduction reaction The activity of catalyst is more preferable, the efficiency of intensified response.

For example temperature compensation unit 300 can include electric heating tube, electric heating tube can be multiple, and multiple electric heating tubes can With independent control, preferably to adjust the temperature of pending tail gas on demand.

Further, temperature compensation unit 300 can include it is multigroup can independent control heating tube, in multigroup heating tube It is at least one set of to be controlled by SCR control, remaining group by A.C. contactor.

Connected it is understood that A.C. contactor is the circuit for having contact in kind, heating tube can be controlled to open or close Close, by controlling the unlatching quantity of heating tube, can with steps control the temperature of tail gas, and the price of A.C. contactor is just Preferably, the cost of reduction temperature compensation unit 300 is contributed to.

Controllable silicon can control to adjust output, for example for controlled heating tube, can continuously control heating tube Heating power increases or reduced, but the price of controllable silicon is higher, can by the temperature compensation unit 300 of said structure form To realize the continuous control of exhaust temperature, and the cost of temperature compensation unit 300 is low.

Further, exhaust gas processing device can also include：Oxygen device for supplying, the outlet of oxygen device for supplying and supervisor Road 220 is connected, and junction is located at the front side of temperature compensation unit 300.Oxygen device for supplying can be oxygen tank, tail gas with And during oxygen and content deficiency in the fresh air of air-breathing, by filling into oxygen, the efficiency of purification reaction can be accelerated, improve purification Efficiency.

Exhaust gas processing device in accordance with a preferred embodiment of the present invention, catalytic oxidation unit 400 include corresponding be catalyzed Reaction vessel and catalyst module, SCR unit 500 include corresponding catalytic reaction cell and catalyst module, Catalytic reaction cell is connected on main pipeline 220, and catalytic reaction cell includes multiple loading areas for being used to install catalyst module Domain, multiple loading areas include main loading area and preparation loading area, and catalyst module is arranged on main loading under normal conditions In region.

It is understood that in the gross exhaust gas increase of engine, for example the number of testboard bay increases, or change During the engine of huge discharge, if detecting, tail gas clean-up rate is not up to standard, can be by increasing catalyst mould in preparation loading area The mode of block, to lift the efficiency of catalytic reaction, designed, can not changed at whole tail gas by the transfiguration to catalytic reaction cell The structure of device is managed, the transformation of exhaust gas processing device is simple and convenient, and cost is low.

The catalyst module of catalytic oxidation unit 400 can use honeycomb carrier, so, the ratio surface of catalyst module Product is high, and the activity of catalyst is high, can be provided with the hole of multiple bents on catalyst coat, can be with shape at the inflection point in hole Into catalyst activity point, so, the activity of catalytic oxidation unit 400 is high, is favorably improved the efficiency of oxidation reaction.

The catalyst module of SCR unit 500 can use honeycomb carrier, so, catalyst module Specific surface area is high, and the activity of catalyst is high, can be provided with the hole of multiple bents on catalyst coat, at the inflection point in hole Catalyst activity point can be formed, so, the activity of SCR unit 500 is high, is favorably improved reduction reaction Efficiency.

Exhaust gas processing device in accordance with a preferred embodiment of the present invention, vent gas treatment pipeline 200 also include：Inlet manifold 210 and exhaust main 240, the both ends of main pipeline 220 and by-pass line 230 respectively with inlet manifold 210 and exhaust main 240 It is connected, main pipeline 220 is provided with maintenance valve 221, and by-pass line 230 is provided with bypath valve 231, and inlet manifold 210 is provided with electronic Total valve 212.

The inlet end of inlet manifold 210 is connected with the outlet side of tail gas collecting device 100, the inlet end of main pipeline 220 with The outlet side of inlet manifold 210 is connected, and the inlet end of by-pass line 230 is connected with the outlet side of inlet manifold 210, main pipeline 220 outlet side is connected with the inlet end of exhaust main 240, the outlet side of by-pass line 230 and the inlet end of exhaust main 240 Be connected, the inlet end of main pipeline 220 optionally connects with the outlet side of main pipeline 220, the inlet end of by-pass line 230 and The outlet side of by-pass line 230 optionally connects.

When needing cleaning of off-gas, bypath valve 231 is closed, the inlet end of by-pass line 230 and going out for by-pass line 230 Gas end is cut off, and maintenance valve 221 is opened, and main pipeline 220 connects, and the tail gas that tail gas collecting device 100 is enriched with passes through main pipeline 220, and be cleaned in the presence of the tail gas catalyzed reaction member on main pipeline 220, that is to say, that the purified treatment of tail gas is anti- Mainly it should occur in main pipeline 220.

Without or temporarily can not cleaning of off-gas when, such as during service conduits or the tail gas catalyzed reaction of maintenance During unit, maintenance valve 221 is closed, and the inlet end of main pipeline 220 is cut off with the outlet side of main pipeline 220, prevents tail Gas is revealed, and bypath valve 231 is opened, and by-pass line 230 connects, and forms interim exhaust emissions passage, and tail gas collecting device 100 is rich The tail gas of collection is discharged by by-pass line 230, so can ensure whole pipeline while tail gas catalyzed reaction member is overhauled Normal exhaust.

Further, vent gas treatment pipeline 200 also includes：First branch pipe 211 and the second branch pipe 241.

It should be noted that the exhaust treatment system 1000 of the embodiment of the present invention can also include any of the above-described individual embodiment Vent gas treatment pipeline 200.

As shown in figure 1, in a preferred embodiment of the invention, reducing agent feeding unit 600 includes：Urea supply dress 610 and urea playpipe 620 are put, urea device for supplying 610 is connected with urea playpipe 620, the ejection section of urea playpipe 620 624 stretch into vent gas treatment pipeline 200, and the ejection section 624 of urea playpipe 620 is located at SCR unit 500 Front side, vent gas treatment pipeline 200 is interior to be provided with flow mixing device 630, and flow mixing device 630 is arranged on ejection section 624 and SCR Between the import of unit 500.

It is understood that urea device for supplying 610 by urea playpipe 620 to vent gas treatment pipeline 200 and interior spray Urea is penetrated, is flowed by the tail gas that catalytic oxidation unit 400 is catalyzed together with urea spraying, and in the presence of flow mixing device 630 It is sufficiently mixed, enters SCR unit 500 by well-mixed urea and tail gas, and in SCR In the presence of the catalyst of unit 500, urea and the NO in tail gas_XReact, reaction principle is as follows：

Urea high temperature heat hydrolysis NH₃, (NH2) 2CO=HNCO+NH3, HNCO+H2O=CO2+NH3；4NH₃+4NO+O₂ =4N₂+6H₂O；2NH₃+NO+NO₂=2N₂+3H₂O；4NH₃+2NO₂+ O2=3N₂+6H₂O。

Thus, exhaust gas processing device will not produce secondary pollution, and buying and the convenient storage of urea, without such as related skill Art sets single dangerous material storeroom like that, and the buying of urea is convenient, not by control, and it is cheap, help to reduce tail The cost of gas disposal.

Specifically, as shown in figure 1, urea device for supplying 610 includes：Air purifier 611, urea pump 613 and urea tank 612, the outlet of air purifier 611 is connected with import of the outlet of urea tank 612 with urea pump 613, and urea pump 613 goes out Mouth is connected with the import of urea playpipe 620.

Air purifier 611 is used to provide free from admixture, cleanliness factor high compressed air for urea pump 613, to prevent urea Pump 613 and urea playpipe 620 block, and ensure that equipment can continue, stably work.

Urea pump 613 can be measuring pump and be connected with control unit 700 that urea pump 613 sucks urea from urea tank 612 Solution, and clean air is sucked by air purifier 611, air is pumped into urea playpipe together with urea liquid 620, the mixture following current for measuring urea liquid and air that urea pump 613 is sent can be sprayed into tail gas by urea playpipe 620 Pipeline 200 is handled, and makes the mixture uniform atomizing of ejection, so as to lift the contact area of urea and tail gas, enhancing reduction is anti- The efficiency answered.

Urea mixed-flow structure according to embodiments of the present invention, the following any realities of the present invention are described below with reference to Fig. 6-Fig. 8 The urea mixed-flow structure for applying example can be used for the exhaust treatment system 1000 and exhaust gas processing device of any of the above-described kind of embodiment.

As Figure 6-Figure 8, urea mixed-flow structure includes：Vent gas treatment pipeline 200, urea playpipe 620 and flow mixing device 630。

Wherein, vent gas treatment pipeline 200 is used for the tail gas that circulates, and vent gas treatment pipeline 200 can be any of the above-described kind of implementation The vent gas treatment pipeline 200 of example, the entrance point of urea playpipe 620 can be connected with urea device for supplying 610, urea playpipe 620 have ejection section 624, and the perisporium of ejection section 624 is provided with the nozzle 625 of multiple settings spaced apart, and ejection section 624 stretches into tail gas Pipeline 200 is handled, specifically, ejection section 624 can be between catalytic oxidation unit 400 and SCR unit 500 Main pipeline 220 stretch into, the angle of the injection direction of nozzle 625 and the flow direction of tail gas is more than or equal to 90 °, the spray of nozzle 625 The axial direction for the spray area that direction is ejected for nozzle 625 is penetrated, flow mixing device 630 is located in vent gas treatment pipeline 200, and flow mixing device 630 are located at after ejection section 624.

Sprayed it is understood that urea forms urea after being sprayed into by nozzle 625 in vent gas treatment pipeline 200, due to Nozzle 625 is located on the perisporium of ejection section 624 so that multiple nozzles 625 in ejection section 624 can spray towards different directions Penetrate, the mutual jeting area 626 of multiple nozzles 625 is non-overlapping, or overlapping area is small, and the atomizing effect of urea is more preferable, and nozzle 625 injection direction and the angle of the flow direction of tail gas are more than or equal to 90 °, can so extend urea and be sprayed at flow mixing device 630 The flowing time in region, flow mixing device 630 are used for mixed tail gas and sprayed with urea, made anti-in SCR unit 500 Should more fully, reaction efficiency is higher.

Urea mixed-flow structure according to embodiments of the present invention, it can effectively lift the mixed effect of urea and tail gas, mist The urea and tail gas of shape can be sufficiently mixed, and are advantageous to catalytic conversion reaction and fully carried out.

In some preferred embodiments of the present invention, as shown in fig. 6, urea playpipe 620 can be multiple, multiple urine Plain playpipe 620 opens arrangement along the circumferentially-spaced of vent gas treatment pipeline 200, so that multiple ejection sections 624 are in vent gas treatment pipeline Circumferentially spaced arrangement in 200.

So, the jeting area 626 of nozzle 625 can cover most of region of vent gas treatment pipeline 200, and different sprays The registration penetrated between region 626 is small, or even without coincidence, urea spraying and the mixing of tail gas are more fully with uniformly, contributing to The efficient progress of catalytic reaction.

In a specific embodiment, with reference to figure 6, the centers of multiple ejection sections 624 can be with concyclic setting, and multiple sprays The center of circle of the circle being centrally formed in portion 624 is penetrated on the axis of vent gas treatment pipeline 200.So, the jeting area of nozzle 625 626 distribution in vent gas treatment pipeline 200 is more balanced.Vent gas treatment pipeline 200 is cylindrical, in multiple ejection sections 624 The diameter of a circle being formed centrally is equal to the half of the internal diameter of vent gas treatment pipeline 200, so that the coincidence before jeting area 626 Registration between degree and the internal perisporium of jeting area 626 and vent gas treatment pipeline 200 is minimum.Such as shown in fig. 6, urine Plain playpipe 620 can be four, and four urea playpipes 620 can be evenly-spaced along the circumference of vent gas treatment pipeline 200 Arrangement, accordingly, urea pump 613 can be four, and four urea pumps 613 correspond with urea playpipe 620.

As shown in fig. 6, the axial direction of ejection section 624 can be axially in parallel with vent gas treatment pipeline 200, and specifically, injection The axial direction in portion 624 can be with axially in parallel at the vent gas treatment pipeline 200 where ejection section 624, and the injection side of nozzle 625 To axially vertical with vent gas treatment pipeline 200.So, the initial velocity for the urea spraying that nozzle 625 sprays is along vent gas treatment The axial direction of pipeline 200 is substantially zeroed, helps to extend urea spraying and the incorporation time of tail gas.

Urea mixed-flow structure according to embodiments of the present invention, flow mixing device 630 can include multiple flow deflectors 631, multiple to lead At least two bearing of trend in flow 631 is different from angle formed by the axial direction of vent gas treatment pipeline 200, further, Multiple flow deflectors 631 divide to be multigroup, and every group of multiple flow deflectors 631 can be formed as the dendriform of bifurcated.So, equivalent to tail Gas and the mixture of urea spraying will make the motion of bent in 200 sections of vent gas treatment pipeline residing for flow mixing device 630, can To extend urea spraying and the mixed path of tail gas.

Urea mixed-flow structure according to embodiments of the present invention, with reference to figure 6- Fig. 8, urea playpipe 620 can include：Mixing Portion 622 and ejection section 624, mixing unit 622 are used for mixing air and urea liquid so that what the nozzle 625 of ejection section 624 sprayed The atomizing effect of urea is good, one end and the vertical connection of mixing unit 622 of the remote nozzle 625 of ejection section 624, the edge of ejection section 624 It is radially into vent gas treatment pipeline 200.625 evenly-spaced setting of multiple nozzles in each ejection section 624.

Urea playpipe 620 according to embodiments of the present invention, the following any realities of the present invention are described below with reference to Fig. 6-Fig. 8 Apply example urea playpipe 620 can be used for the exhaust treatment system 1000 of any of the above-described kind of embodiment, exhaust gas processing device and Urea mixed-flow structure.

As Figure 6-Figure 8, urea playpipe 620 according to embodiments of the present invention includes：Sucting 621, mixing unit 622 With ejection section 624.

Wherein, the import of sucting 621 is suitable to be connected with the outlet of urea device for supplying 610, for example sucting 621 enters Mouth is suitable to be connected with the outlet of urea pump 613, and suction pump is used to receive urea liquid and air that urea pump 613 pumps out, mixes The import in portion 622 is connected with the outlet of sucting 621, and mixing unit 622 is used for mixing urea solution and air, ejection section 624 One end is connected with the outlet of mixing unit 622, and ejection section 624 is provided with multiple nozzles 625, and nozzle 625 can be located at ejection section 624 The other end, at least multiple perisporiums along ejection section 624 in multiple nozzles 625 are arranged spaced apart.

It is understood that ejection section 624 can be cylinder, the multiple nozzles 625 being located on the perisporium of ejection section 624 It can be sprayed towards different directions, the mutual jeting area 626 of these nozzles 625 is non-overlapping, or degree of overlapping is small, the mist of urea It is more preferable to change effect.

Urea mixed-flow structure according to embodiments of the present invention, the atomizing effect of urea can be effectively lifted, to lift urine The mixing uniformity of element and tail gas.

According to the urea playpipe 620 of an alternative embodiment of the invention, the part in multiple nozzles 625 is located at injection The other end in portion 624.For example in a specific embodiment, one or more sprays can be provided with the end face of ejection section 624 Mouth 625, the jeting area 626 that such ejection section 624 ejects it is three-dimensional more preferable.

According to the urea playpipe 620 of another preferred embodiment of the present invention, all nozzles 625 are along ejection section 624 Perisporium it is arranged spaced apart, so, all nozzles 625 injection spraying the initial velocity along exhaust gas flow direction it is identical, Urea spraying is contributed to be mixed with the uniform of tail gas.

As shown in figure 8, it is evenly-spaced to be located at perisporium of the multiple nozzles 625 of the perisporium of ejection section 624 along ejection section 624 Arrangement, specifically, as shown in fig. 7, being located at multiple nozzles 625 of the perisporium of ejection section 624 can be located on same circumference.This Sample, the degree of overlapping between the jeting area 626 of adjacent two nozzles 625 is small, and the integral spray that urea playpipe 620 is formed The distribution in region 626 is more balanced.

In a specific embodiment, as shown in figure 8, the cross section of ejection section 624 include square inner peripheral surface and With the outer peripheral face of circle, circle is external in square, and the nozzle 625 for being located at the perisporium of ejection section 624 is four, and four nozzles 625 are respectively provided on four sides of square.

According to the urea playpipe 620 of another preferred embodiment of the present invention, as shown in fig. 7, the axial direction of ejection section 624 with Mixing unit 622 it is axially vertical, ejection section 624 is connected with mixing unit 622 by the linkage section 623 of arc.So it is easy to spray Portion 624 is radially into along vent gas treatment pipeline 200.

According to the urea playpipe 620 of another preferred embodiment of the present invention, nozzle 625 includes spray-hole and hole is blocked up, and sprays Perforation runs through the perisporium of ejection section 624, and hole is stifled to be movably located on spray-hole along the radial direction of ejection section 624, and hole blocking package includes cone Shape section, and radial direction of the diameter of conical section along ejection section 624 tapers into from outside to inside, a diameter of 0.45mm- of spray-hole 0.55mm, such as 0.5mm.

It is understood that urea liquid and air are transported to urea playpipe under the pressure effect of urea pump 613 620 ejection section 624, the perforate of mixed solution top are blocked up, the stifled axial movement along spray-hole in hole so that and urea is in vaporific ejection, and The shape of jeting area 626 can be with generally conical, and the atomizing effect of nozzle 625 is good, and atomizing particle average diameter is 40 micro- Rice, reasonable in design, anti-clogging performance is good.

As shown in figure 1, exhaust treatment system 1000 in accordance with a preferred embodiment of the present invention, control unit 700 include： Controller 710 and sensor, controller 710 are connected with sensor to control temperature compensation unit according to the signal of sensor feedback 300 or reducing agent feeding unit 600.

Wherein, sensor can include：It is arranged in the temperature sensor 721 of the upstream of temperature compensation unit 300, is arranged in temperature Degree compensating unit 300 in temperature sensor 721, be arranged in the downstream of temperature compensation unit 300 temperature sensor 721, arrangement Temperature sensor 721 in urea tank 612, the oxygen being arranged between temperature compensation unit 300 and catalytic oxidation unit 400 pass Sensor 722, the pressure sensor 723 being arranged between temperature compensation unit 300 and catalytic oxidation unit 400, it is arranged in temperature NOx concentration sensor 724 between compensating unit 300 and catalytic oxidation unit 400, the flow being arranged in main pipeline 220 pass Sensor 725, both ends are connected with the entrance point of catalytic oxidation unit 400 and the port of export of SCR unit 500 respectively Differential pressure pickup 726 and the liquid level sensor 727 that is arranged in urea tank 612.

The signal that controller 710 can detect according to the sensor controls the unlatching power of temperature compensation unit 300, urine The power of plain pump 613, the unlatching number of blower fan 250 are with opening power etc..

Exhaust gas processing device according to embodiments of the present invention is described below with reference to Fig. 9-Figure 10.

Exhaust gas processing device according to embodiments of the present invention includes：Vent gas treatment pipeline 200, temperature compensation unit 300, urge Change oxidation unit 400, SCR unit 500, reducing agent feeding unit 600, lower floor's accommodating chamber 810 and upper strata to accommodate Room 820.

Wherein, vent gas treatment pipeline 200 can be the vent gas treatment pipeline 200 of any of the above-described kind of embodiment, temperature-compensating Unit 300, catalytic oxidation unit 400, SCR unit 500 are sequentially arranged on vent gas treatment pipeline 200, are reduced The outlet of agent feeding unit 600 is connected with the import of SCR unit 500, temperature compensation unit 300, catalysis oxidation Unit 400, SCR unit 500, the structure of reducing agent feeding unit 600 and connected mode are referred to above-mentioned The description of each embodiment.

Upper strata accommodating chamber 820 is located at the top of lower floor's accommodating chamber 810, is provided with upper strata accommodating chamber 820 and leads to upper strata receiving The cat ladder of room 820, cat ladder mouth 825 can be provided with the floor of upper strata accommodating chamber 820, passed through for personnel.

The floor of upper strata accommodating chamber 820 has the first portable plate 821, the second portable plate 822 and the 3rd portable plate 823, temperature Degree compensating unit 300, catalytic oxidation unit 400, SCR unit 500 are arranged in upper strata accommodating chamber 820, and The top of the first portable plate 821, the top of the second portable plate 822, the top of the 3rd portable plate 823 are arranged in correspondingly.

It is understood that the area of the first portable plate 821 is more than projection of the temperature compensation unit 300 on floor, the One portable plate 821 covers view field of the temperature compensation unit 300 on floor, and temperature compensation unit 300 is arranged in the first work The top of dynamic plate 821, when the first portable plate 821 is opened, the floor of upper strata accommodating chamber 820 is opened wide at the first portable plate 821, Temperature compensation unit 300 can enter lower floor's accommodating chamber 810 from unlimited, and then be easy to repair.

The area of second portable plate 822 is more than projection of the catalytic oxidation unit 400 on floor, and the second portable plate 822 covers View field of the lid catalytic oxidation unit 400 on floor, catalytic oxidation unit 400 are arranged in the top of the second portable plate 822, When the second portable plate 822 is opened, the floor of upper strata accommodating chamber 820 is opened wide at the second portable plate 822, catalytic oxidation unit 400 can enter lower floor's accommodating chamber 810 from unlimited, and then be easy to repair.

The area of 3rd portable plate 823 is more than projection of the SCR unit 500 on floor, the 3rd portable plate 823 view fields of the covering SCR units 500 on floor, SCR unit 500 are arranged in the The top of three portable plates 823, when the 3rd portable plate 823 is opened, the floor of upper strata accommodating chamber 820 is at the 3rd portable plate 823 Open wide, SCR unit 500 can enter lower floor's accommodating chamber 810 from unlimited, and then be easy to repair.

First portable plate 821, the second portable plate 822, the mounting means of the 3rd portable plate 823 have a variety of, for example can lead to Hinge installation is crossed, or is installed by threaded fastener, buckle etc..

Exhaust gas processing device according to embodiments of the present invention, easily all parts of exhaust gas processing device can be carried out Maintenance.

Exhaust gas processing device in accordance with a preferred embodiment of the present invention, temperature compensation unit 300 can be supported on first On portable plate 821, for example it can be supported on by support frame on the first portable plate 821, catalytic oxidation unit 400 is supported on second On portable plate 822, for example it can be supported on by support frame on the second portable plate 822, SCR unit 500 supports It on the 3rd portable plate 823, for example can be supported on by support frame on the 3rd portable plate 823, so, eliminate temperature-compensating The suspension of unit 300, catalytic oxidation unit 400, SCR unit 500.

Further, suspension (not shown) can be provided with upper strata accommodating chamber 820, suspension is arranged in temperature Spend compensating unit 300, catalytic oxidation unit 400, the top of SCR unit 500, and optionally with temperature Compensating unit 300, catalytic oxidation unit 400, SCR unit 500 are connected.

Specifically, suspension includes：First hook, the second hook, the 3rd hook.First hitch arrangements are in temperature-compensating The top of unit 300, the second hitch arrangements in the top of catalytic oxidation unit 400, the 3rd hitch arrangements in selective catalysis also The top of former unit 500.Suspension can be that hydraulic-driven or motor drive, and the first hook, the second hook, the 3rd hook can To realize lifting by pulley or assembly pulley.Such as when needing repairing catalytic oxidation unit 400, by catalytic oxidation unit 400 Hang on the second hook, open the second portable plate 822, catalytic oxidation unit 400 is dropped in lower floor's accommodating chamber 810.

Reducing agent feeding unit 600 can include urea tank, and urea tank can be arranged in lower floor's accommodating chamber 810, so as to In supplement urea.

As shown in figure 9, vent window, lower floor's accommodating chamber are equipped with the perisporium of lower floor's accommodating chamber 810 and upper strata accommodating chamber 820 810 are provided with lower vent window 811, and upper strata accommodating chamber 820 is provided with upper vent window 824, and lower floor's accommodating chamber 810 and upper strata are held with realizing Receive the ventilation of room 820, it is, of course, also possible to forced ventilation equipment is provided with, such as blower fan, with lower floor's accommodating chamber 810 and upper strata appearance Receive room 820 temperature it is higher when force air draft.

As shown in figure 9, can be provided with inspection platform 830 outside upper strata accommodating chamber 820, inspection platform 830 can be held by lower floor The portion top wall of room 810 received is formed.It is understood that one end of upper strata accommodating chamber 820, which can be provided with, passes through inspection platform 830 Maintenance door, the periphery wall at the inspection platform 830 of upper strata accommodating chamber 820 is provided with maintenance cat ladder 831, in order to repair Personnel overhaul.

In a specific example, upper strata accommodating chamber 820 and lower floor accommodating chamber 810 can be container system into.By This, can reduce the construction cost of exhaust gas processing device, be easy to move.

The catalytic reaction cell 900 of exhaust gas processing device according to embodiments of the present invention is described below with reference to Figure 11-Figure 13, Catalytic reaction cell 900 is used to place catalyst module, such as when catalytic reaction cell 900 is used as catalytic oxidation unit 400 It can be placed during housing, in catalytic reaction cell 900 and 400 corresponding catalyst module of catalytic oxidation unit；Work as catalytic reaction When container 900 is used as the housing of SCR unit 500, it can place in catalytic reaction cell 900 and be urged with selectivity Change catalyst module corresponding to reduction unit 500.

The catalytic reaction cell 900 of exhaust gas processing device according to embodiments of the present invention includes：First joint 910, main cylinder Body 920, the second joint 930.

Wherein, the first joint 910 and the second joint 930 are used to be connected with vent gas treatment pipeline 200, such as the first joint One end of 910 remote main cylinder 920 can be provided with ring flange, and one end of the remote main cylinder 920 of the second joint 930 is provided with method Blue disk, such catalytic reaction cell 900 is easy to be connected with vent gas treatment pipeline 200, and when breaking down, is readily disassembled.

The both ends open of main cylinder 920, main loading area 924 and preparation loading area 925 are limited in main cylinder 920, First joint 910 is connected with one end of main cylinder 920, and the second joint 930 is connected with the other end of main cylinder 920.

It is understood that in the gross exhaust gas increase of engine, for example the number of testboard bay increases, or change During the engine of huge discharge, if detecting, tail gas clean-up rate is not up to standard, can be by increasing catalyst in preparation loading area 925 The mode of module, to lift the efficiency of catalytic reaction.

Catalytic reaction cell 900 according to embodiments of the present invention, is designed by transfiguration, can not change whole vent gas treatment On the basis of the structure of device, catalytic efficiency is adjusted, the transformation of exhaust gas processing device is simple and convenient, and cost is low.

Catalytic reaction cell 900 in accordance with a preferred embodiment of the present invention, as shown in figure 12, the main He of loading area 924 Preparation loading area 925 be able to can include along the axially spaced of main cylinder 920, main cylinder 920：The preparation section being sequentially connected 921st, linkage section 922, principal piece 923.

First joint 910 is connected with preparation section 921, and the second joint 930 is connected with principal piece 923, prepares remote the of section 921 One end of one joint 910 is connected with linkage section 922, one end and the principal piece 923 away from preparation section 921 of linkage section 922 it is remote One end of second joint 930 is connected.

Principal piece 923 limits main loading area 924, and preparation section 921 limits prepared loading area 925, preparation section 921 with Axial limit structure is provided between linkage section 922, axial limit structure, axial limiting are provided between linkage section 922 and principal piece 923 Structure is used to prevent catalyst module play vertically, by setting the main cylinder 920 of three-stage, contributes to axial limit structure Formation, for example prepared axial limit structure between section 921 and linkage section 922 can be the flange extended radially inwards, The flange can be located on prepared section 921 or linkage section 922, and the axial limit structure between linkage section 922 and principal piece 923 can be with For the flange extended radially inwards, the flange can be located in linkage section 922 and principal piece 923.

As shown in Figure 11-Figure 12, the first joint 910 is connected with preparation section 921 by ring flange, the second joint 930 and master Section 923 overlap weldings connection, linkage section 922 are connected with the preparation overlap welding of section 921, and linkage section 922 connects with 923 equal overlap welding of principal piece Connect.It is understood that said structure causes the convenient disassembly between the first joint 910 and preparation section 921, it is easy to addition to be catalyzed Agent module.Certainly, linkage section 922 can also be connected with principal piece 923 by ring flange.

Catalytic reaction cell 900 in accordance with a preferred embodiment of the present invention, as shown in figures 11-13, main cylinder 920 can To include truncated rectangular pyramids section 941 and cylindrical segment 942, truncated rectangular pyramids with square-section, the first joint 910 and the second joint 930 Section 941 is connected with main cylinder 920.First joint 910 and the second joint 930 and axial limit can be formed to catalyst module automatically Position.Specifically, main cylinder 920 can have square section, and truncated rectangular pyramids section 941 can be positive truncated rectangular pyramids section 941.

The invention also discloses a kind of exhaust gas processing device, the exhaust gas processing device of the embodiment of the present invention is provided with above-mentioned A kind of catalytic reaction cell 900 of embodiment.

In the description of this specification, reference term " one embodiment ", " some embodiments ", " illustrative examples ", The description of " example ", " specific example " or " some examples " etc. means to combine specific features, the knot that the embodiment or example describe Structure, material or feature are contained at least one embodiment or example of the present invention.In this manual, to above-mentioned term Schematic representation is not necessarily referring to identical embodiment or example.Moreover, specific features, structure, material or the spy of description Point can combine in an appropriate manner in any one or more embodiments or example.

Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that：Not In the case of departing from the principle and objective of the present invention a variety of change, modification, replacement and modification can be carried out to these embodiments, this The scope of invention is limited by claim and its equivalent.

Claims

A kind of 1. exhaust treatment system, it is characterised in that including：

Tail gas collecting device, the tail gas collecting device are used to collect tail gas；

Vent gas treatment pipeline, the inlet end of the vent gas treatment pipeline are connected with the outlet side of the tail gas collecting device；

Temperature compensation unit, the temperature compensation unit are located on the vent gas treatment pipeline；

Catalytic oxidation unit, SCR unit, the catalytic oxidation unit and the SCR unit It is sequentially connected in series and is located in the vent gas treatment pipeline；

Reducing agent feeding unit, the outlet of the reducing agent feeding unit are located at the vent gas treatment pipeline communication and connectivity part The front side of the SCR unit；

Control unit, described control unit are connected with the temperature compensation unit and the reducing agent feeding unit.
2. exhaust treatment system according to claim 1, it is characterised in that the reducing agent feeding unit includes：Urea Device for supplying and urea playpipe, the urea device for supplying are connected with the urea playpipe, the spray of the urea playpipe The portion of penetrating stretches into the vent gas treatment pipeline and positioned at the front side of the SCR unit.
3. exhaust treatment system according to claim 2, it is characterised in that the axial direction of the ejection section and the ejection section Axially in parallel at the vent gas treatment pipeline at place, the ejection section perisporium is provided with the nozzle of multiple settings spaced apart.
4. exhaust treatment system according to claim 3, it is characterised in that the urea playpipe is multiple, Duo Gesuo State urea playpipe and open arrangement along the circumferentially-spaced of the vent gas treatment pipeline, so that multiple ejection sections are at the tail gas Manage circumferentially spaced arrangement in pipeline.
5. exhaust treatment system according to claim 2, it is characterised in that be provided with mixed flow in the vent gas treatment pipeline Device, the flow mixing device are arranged between the ejection section and the import of the SCR unit.
6. according to the exhaust treatment system any one of claim 1-5, it is characterised in that also include：Oxygen supply dress Put, the outlet of the oxygen device for supplying is connected with the vent gas treatment pipeline and junction is located at the temperature compensation unit Front side.
7. according to the exhaust treatment system any one of claim 1-5, it is characterised in that described control unit includes： Controller and sensor, the controller are connected with the sensor to control the temperature according to the signal of the sensor feedback Spend compensating unit or the reducing agent feeding unit.
8. according to the exhaust treatment system any one of claim 1-5, it is characterised in that also include：

Blower fan, the import of the blower fan are connected with the vent gas treatment pipeline；

Chimney, the chimney are connected with the outlet of the blower fan；

Wherein, the blower fan electrically connects with described control unit, and is arranged to stop supply tail gas in the tail gas collecting device And the reducing agent feeding unit stops shutting down after controlling the blower fan work scheduled time during supply reducing agent.
9. according to the exhaust treatment system any one of claim 1-5, it is characterised in that the vent gas treatment pipeline bag Include：Inlet manifold, main pipeline and by-pass line, exhaust main in parallel, one end of the inlet manifold and the exhaust collection The outlet side of device is connected, and the other end is connected with the inlet end of the main pipeline and the inlet end of the by-pass line, the temperature Degree compensating unit, the catalytic oxidation unit and the SCR unit are each provided on the main pipeline, the master The outlet side of pipeline and the outlet side of the by-pass line are connected with the exhaust main, and the main pipeline is provided with service valve Door, the by-pass line are provided with bypath valve.
10. exhaust treatment system according to claim 9, it is characterised in that the vent gas treatment pipeline also includes：

First branch pipe, first branch pipe are connected with the main pipeline, and junction is positioned at the rear side of the maintenance valve, described First branch pipe is provided with the first normally opened relief valve；Second branch pipe, second branch pipe are connected with the exhaust main, and described Two branch pipes are provided with the second normally closed relief valve.