CN107178410A

CN107178410A - The urea playpipe of exhaust treatment system

Info

Publication number: CN107178410A
Application number: CN201710447048.0A
Authority: CN
Inventors: 王如双; 陈洲; 张瑞萍; 付文明; 徐彬
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: 2017-09-19

Abstract

The invention discloses a kind of urea playpipe of exhaust treatment system, the urea playpipe of the exhaust treatment system includes：Sucting；Mixing unit, the import of the mixing unit is connected with the outlet of the sucting；Ejection section, one end of the ejection section is connected with the outlet of the mixing unit, and at least multiple perisporiums along the ejection section that the ejection section is provided with multiple nozzles, multiple nozzles are arranged spaced apart.The urea mixed-flow structure of the present invention, can effectively lift the atomizing effect of urea, to lift the mixing uniformity of urea and tail gas.

Description

The urea playpipe of exhaust treatment system

Technical field

The invention belongs to tail gas disposal technique field, in particular to a kind of urea playpipe 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 Engine continuous work in journey on each stand, the pollution caused is 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, is located more than the latter using chemicals such as strong acid 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, causes most car engine engineer's workshop to be unwilling increase tail gas treatment device or equipment after installing 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 solving one of technical problem present in prior art.Therefore, the present invention proposes a kind of tail The urea playpipe of gas processing system, the urea playpipe of the exhaust treatment system can effectively lift the atomization effect of urea Really.

The urea playpipe of exhaust treatment system according to embodiments of the present invention, including：Sucting；Mixing unit, it is described mixed The import in conjunction portion is connected with the outlet of the sucting；Ejection section, one end of the ejection section and the outlet phase of the mixing unit Even, at least multiple perisporiums along the ejection section that the ejection section is provided with multiple nozzles, multiple nozzles are spaced apart cloth Put.

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

The urea playpipe of exhaust treatment system according to an embodiment of the invention, all nozzles are along described The perisporium of ejection section is arranged spaced apart.

A part in the urea playpipe of exhaust treatment system according to an embodiment of the invention, multiple nozzles It is located at the other end of the ejection section.

The urea playpipe of exhaust treatment system according to an embodiment of the invention, at least multiple nozzles are described in The evenly-spaced arrangement of the perisporium of ejection section.

Preferably, at least multiple nozzles are located on same circumference.

The urea playpipe of exhaust treatment system according to an embodiment of the invention, the cross section of the ejection section includes The inner peripheral surface of square and the outer peripheral face with circle, the circle are external in the square, and at least multiple nozzles are four It is individual, and be respectively provided on four square sides.

The urea playpipe of exhaust treatment system according to an embodiment of the invention, the axial direction of the ejection section with it is described Mixing unit it is axially vertical.

Preferably, the ejection section is connected with the mixing unit by the linkage section of arc.

The urea playpipe of exhaust treatment system according to an embodiment of the invention, the nozzle includes running through the spray Penetrate the spray-hole of the perisporium in portion and be movably located at hole on the spray-hole along the radial direction of the ejection section and block up, the hole is blocked up Including conical section, and radial direction of the diameter along the ejection section of the conical section is tapered into from outside to inside.

Preferably, a diameter of 0.45mm-0.55mm of the spray-hole.

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 from description of the accompanying drawings below to embodiment is combined Substantially and be 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 are 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 are the structural representations of urea playpipe 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, maintenance valve 221, 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 is mixed 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.

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 indicate 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, defining " 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 to 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, are 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 is connected with the outlet side of tail gas collecting device 100, The tail gas of engine discharge is entered back into by the collection of tail gas collecting device 100 to be focused in vent gas treatment pipeline 200, to increase The efficiency of strong vent gas treatment, reduces 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 warm Electric heating tube can be included by spending compensating unit 300, electric heating tube can be 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 is connected with vent gas treatment pipeline 200, and outlet and the tail gas of reducing agent feeding unit 600 The connectivity part for handling 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 sequentially arrange, corresponding catalyst is mounted with catalytic oxidation unit 400 is used for catalysis oxidation partial reductive material, choosing Selecting property catalytic reduction unit 500 is then used to optionally reduce NO_X。

Such as catalytic oxidation unit 400 mainly can be made of ceramics, and its main purpose is reduction 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 the air being mixed into 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%, 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 H₂Reducing agent in O, course of reaction is 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 and reducing agent feeding unit 600 of temperature compensation unit 300 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 and focused in vent gas treatment pipeline 200, control unit 700 is according to state modulator temperature such as temperature, the flows of tail gas 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 is produced in processing procedure.

Exhaust treatment system 1000 according to embodiments of the present invention, can easily focus on the tail of engine emission Gas, treatment effeciency is high, energy consumption is low, and will not produce in processing procedure secondary pollution, and potential safety hazard is small, in long-term use Cheng Zhong, only need to supplement reducing agent, use cost is low, it is easy to operation and maintenance, 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 is optionally connected, 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 bypath valve 231, temperature compensation unit provided with maintenance valve 221, by-pass line 230 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 is optionally connected 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.

Tail gas catalyzed reaction member can include the catalytic oxidation unit 400 and selective catalysis of above-described embodiment description 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, to supplement the oxygen needed for 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 detect the toxic component content after vent gas treatment mainly for detection of Tail gas measuring after processing, such as environmental administration When, without being climbed in such as correlation technique onto 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 is opened, the tail gas that tail gas collecting device 100 is enriched with by main pipeline 220, and with from first It is cleaned in the presence of the fresh air mixing that branch pipe 211 is sucked, the tail gas catalyzed reaction member on main pipeline 220, that is to say, that The purified treatment reaction of tail gas is main to be occurred in main pipeline 220.

Without or temporarily can not cleaning of off-gas when, such as during service conduits or overhaul tail gas catalyzed reaction 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 is connected, 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, it is ensured that 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 is electrically connected with control unit 700, and is set 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 is connected, and blower fan 250 can be connected with control unit 700, by controlling the unlatching number of blower fan 250, can be controlled At least one in the flow velocity of tail gas processed, 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, to prevent tail gas from driving blower fan 250 to rotate, and 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, it is ensured that 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 is 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, concentrate to be transported in vent gas treatment pipeline 200 by collecting pipeline 120 and purified, can so reduce tail gas The arrangement quantity of processing equipment, the hall space that reduction exhaust treatment system 1000 takes, and pressure-regulating valve 115 can be effective Ground controls tail gas collecting device 100 to the suction of engine exhaust emission, is maintained at the pressure of the exhaust port of engine 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 is filled 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 is filled 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, prevents 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 two ends of sensor connector 116 can lead to Flange is crossed 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, such as 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 exist 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 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 be prevented from producing influence to the pressure of the front end of pressure-regulating valve 115 from extraneous air-breathing.

With reference to Fig. 3, one end of the 3rd section 113 of remote second segment 112 responds stop valve 118, fire-fighting response provided with fire-fighting Stop valve 118 can be motor-driven valve.It is understood that when catching fire, fire-fighting response stop valve 118 can be closed automatically, be prevented 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 Fig. 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 is connected, and the 4th section 114 is provided with muffler 119, and muffler 119 is used to reduce the gas in pneumatic noise, reduction 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 is the actual internal area of second segment 112, and S3 is the 3rd section 113 of actual internal area, and S4 cuts for the 4th section 114 of circulation 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, such as 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, 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 122,110 points of multiple bye-passes, which are two groups, is arranged in the both sides of 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, sequentially provided with temperature compensation unit 300, catalytic oxidation unit 400 and choosing on 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 Dissolved organic matter (SOF) that can effectively in catalysed particulate thing (PM) is oxidized, and 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 is optionally connected 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, is suitable to install tail gas catalyzed anti-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 that above-described embodiment is described 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 is main to be occurred 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 is optionally connected with the outlet side of main pipeline 220, The inlet end of by-pass line 230 is optionally connected 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, main pipeline 220 suitable for installing tail gas catalyzed reaction member.

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 maintenance valve 221 and bypath valve 231 can be manual 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 represents that corresponding pipeline is in connected state in opening, and valve is closed representing corresponding pipeline in cutting Disconnected state.

Further, maintenance valve 221 can distinguish tail gas catalyzed reaction with least two, and two maintenance valves 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 two 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 be 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 Heat-insulating, fire-preventing set is all covered with outside house steward 240, vent gas treatment pipeline 200 is arranged indoors, such as can be arranged in container and build 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 temperature in the heat radiation of pipeline, reduction factory building, and prevent high temperature 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 at least one in the flow velocity of tail gas, 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 is optionally connected 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 is optionally connected with the outlet side of main pipeline 220, bypass The inlet end of pipeline 230 is optionally connected with the outlet side of by-pass line 230.

The inlet end of main pipeline 220 connected with the outlet side of main pipeline 220 and by-pass line 230 inlet end and bypass 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, and the fractions occurred in oxidation reaction, 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 is mixed 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 without dirt The N of dye₂And H₂Reducing agent in O, course of reaction is 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 is connected with the outlet side of by-pass line 230, so, and tail gas does not interfere with the maintenance of equipment.

Exhaust gas processing device according to embodiments of the present invention, can easily focus on the tail gas of engine emission, place Manage efficiency high, energy consumption low, 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, it is easy to operation and maintenance, 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 is 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.

Such as temperature compensation unit 300 can include electric heating tube, and 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 At least one set is by SCR control, and remaining group passes through A.C. contactor and controlled.

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 the temperature for controlling tail gas, and A.C. contactor price just Preferably, contribute to reduce the cost of temperature compensation unit 300.

Controllable silicon can control to adjust output, such as 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 when oxygen in the fresh air of air-breathing and not enough content, by filling into oxygen, the efficiency of purification reaction can be accelerated, purification is improved Efficiency.

Exhaust gas processing device in accordance with a preferred embodiment of the present invention, catalytic oxidation unit 400 includes corresponding catalysis 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 load under normal conditions In region.

It is understood that in the gross exhaust gas increase of engine, such as the number of testboard bay increases, or changes , can be by increasing catalyst mould in preparation loading area if it is not up to standard to detect tail gas clean-up rate during the engine of huge discharge The mode of block, to lift the efficiency of catalytic reaction, is designed by the transfiguration to catalytic reaction cell, can not changed at whole tail gas 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, and can be provided with catalyst coat can be with shape at the inflection point in the hole of multiple bents, 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 inflection point in the hole of multiple bents, hole on catalyst coat 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 includes：Inlet manifold 210 and exhaust main 240, the two 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 is optionally connected 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 is optionally connected.

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 is connected, and the tail gas that tail gas collecting device 100 is enriched with passes through main pipeline It is cleaned in the presence of 220, and tail gas catalyzed reaction member on main pipeline 220, that is to say, that the purified treatment of tail gas is anti- Main should occur in main pipeline 220.

Without or temporarily can not cleaning of off-gas when, such as during service conduits or overhaul tail gas catalyzed reaction 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 is connected, 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 be while tail gas catalyzed reaction member is overhauled, it is ensured that whole pipeline 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 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 Flow mixing device 630 is provided with front side, vent gas treatment pipeline 200, 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, the tail gas being catalyzed by catalytic oxidation unit 400 flows 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 cheap, helps 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 import of the outlet of the outlet of air purifier 611 and urea tank 612 with urea pump 613 is connected, 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 are blocked, it is ensured 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, 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 is used for mixed tail gas and sprayed with urea, makes anti-in SCR unit 500 Should more fully, reaction efficiency is higher.

Urea mixed-flow structure according to embodiments of the present invention, can effectively lift the mixed effect of urea and tail gas, mist The urea and tail gas of shape can be sufficiently mixed, and be conducive to catalytic conversion reaction fully to carry 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 Fig. 6, the center of multiple ejection sections 624 can be set with concyclic, and multiple sprays The center of circle for 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, 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 are corresponded 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 the axially formed angle of vent gas treatment pipeline 200, further, Multiple 631 points of flow deflectors are 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 Fig. 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, and one end of the remote nozzle 625 of ejection section 624 is vertical with mixing unit 622 to be connected, the edge of ejection section 624 It is radially into vent gas treatment pipeline 200.The evenly-spaced setting of multiple nozzles 625 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, such as 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 is pumped 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 At least multiple perisporiums along ejection section 624 in the other end, multiple nozzles 625 are arranged spaced apart.

It is understood that ejection section 624 can be cylinder, multiple nozzles 625 on the perisporium of ejection section 624 are located at 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 Change effect more preferable.

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.Such as, 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 is ejected it is three-dimensional more preferably.

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, the initial velocity along exhaust gas flow direction for the spraying that all nozzle 625 sprays 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 Degree of overlapping between sample, the jeting area 626 of adjacent two nozzles 625 is small, and the integral spray of the formation of urea playpipe 620 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 circular outer peripheral face, 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 injection 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 stifled, spray 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 along ejection section 624 of conical section taper 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, mixed solution top perforate is blocked up, the stifled axial movement along spray-hole in hole so that urea sprays in vaporific, 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 includes： Controller 710 and sensor, controller 710 are connected to control temperature compensation unit according to the signal of sensor feedback with sensor 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 Temperature sensor 721, the temperature sensor 721 for being arranged in the downstream of temperature compensation unit 300 in degree compensating unit 300, arrangement Temperature sensor 721 in urea tank 612, the oxygen being arranged between temperature compensation unit 300 and catalytic oxidation unit 400 are passed 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 are passed Sensor 725, two 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.

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

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 are described Structure, material or feature are contained at least one embodiment of the present invention or example.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 in an appropriate manner be combined 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

1. a kind of urea playpipe of exhaust treatment system, it is characterised in that including：

Sucting；

Mixing unit, the import of the mixing unit is connected with the outlet of the sucting；

Ejection section, one end of the ejection section is connected with the outlet of the mixing unit, and the ejection section is provided with multiple nozzles, multiple At least multiple perisporiums along the ejection section in the nozzle are arranged spaced apart.

2. the urea playpipe of exhaust treatment system according to claim 1, it is characterised in that all nozzles are equal Perisporium along the ejection section is arranged spaced apart.

3. the urea playpipe of exhaust treatment system according to claim 1, it is characterised in that in multiple nozzles A part is located at the other end of the ejection section.

4. the urea playpipe of exhaust treatment system according to claim 1, it is characterised in that at least multiple nozzles Along the evenly-spaced arrangement of the perisporium of the ejection section.

5. the urea playpipe of exhaust treatment system according to claim 4, it is characterised in that at least multiple nozzles On same circumference.

6. the urea playpipe of the exhaust treatment system according to any one of claim 1-5, it is characterised in that the spray Penetrating the cross section in portion includes the inner peripheral surface of square and the outer peripheral face with circle, and the circle is external in the square, described At least multiple nozzles are four, and are respectively provided on four square sides.

7. the urea playpipe of the exhaust treatment system according to any one of claim 1-5, it is characterised in that the spray Penetrate the axially vertical of the axial direction in portion and the mixing unit.

8. the urea playpipe of exhaust treatment system according to claim 7, it is characterised in that the ejection section with it is described Mixing unit is connected by the linkage section of arc.

9. the urea playpipe of the exhaust treatment system according to any one of claim 1-5, it is characterised in that the spray Mouth includes the spray-hole of the perisporium through the ejection section and is movably located at the spray-hole along the radial direction of the ejection section On hole block up, the hole blocking package includes conical section, and the conical section radial direction of the diameter along the ejection section from outside to inside gradually Diminish.

10. the urea playpipe of exhaust treatment system according to claim 9, it is characterised in that the spray-hole it is straight Footpath is 0.45mm-0.55mm.