CN105464762A - Selective catalytic reduction system - Google Patents
Selective catalytic reduction system Download PDFInfo
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- CN105464762A CN105464762A CN201410311159.5A CN201410311159A CN105464762A CN 105464762 A CN105464762 A CN 105464762A CN 201410311159 A CN201410311159 A CN 201410311159A CN 105464762 A CN105464762 A CN 105464762A
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- reducing agent
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- catalytic reduction
- selective catalytic
- reduction system
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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Abstract
A selective catalytic reduction system comprises a reducing agent tank, a metering and spraying module, a reducing agent supply line, a compressed air source, an auxiliary air line and a reducing agent cleaning line, wherein the metering and spraying module comprises a reducing agent metering valve and a reducing agent spraying channel; the reducing agent supply line is connected between the reducing agent tank and the metering valve; the auxiliary air line operates together with the reducing agent supply line; the upstream end of the auxiliary air line is connected with the compressed air source, and the downstream end of the auxiliary air line leads to an outlet of the reducing agent spraying channel, so that compressed air from the compressed air source is sprayed towards reducing agent flow; the upstream end of the reducing agent cleaning line is connected with the compressed air source, the downstream end of the reducing agent cleaning line leads to the reducing agent spraying channel, the reducing agent cleaning line is controlled to operate after operation of the reducing agent supply line and operation of the auxiliary air line are finished so that compressed air from the compressed air source can be sprayed towards the metering valve, and residual reducing agents in the metering valve are forced to return towards the reducing agent tank. The selective catalytic reduction system can reduce the cost and shorten the cleaning time of the residual reducing agents.
Description
Technical field
The application relates to a kind of selective catalytic reduction (SCR) system for carrying out reprocessing to motor exhaust, and it has the reducing agent cleaning module after work, reducing agent being refluxed.
Background technique
In order to reduce the harmful components in vehicle, current vehicle is equipped with suitable exhaust gas aftertreatment system usually, in order to reduce the harmful gas amount that motor is discharged.Such as, selective catalytic reduction system operating is a kind of effective motor exhaust after-treatment system, and the NOx in tail gas is reduced more than 50% by the urea liquid sprayed in blast duct for vehicle as reducing agent by it.
After motor end of run, exhaust system temperature declines, and urea liquid at low temperatures can crystallization or freezing, and this can cause problem.For example, the aqueous solution of urea as 32.5% content of standard restoration agent can freeze under lower than the ambient temperature of-11 DEG C.After vehicle is flame-out, remain in urea supply module or in urea liquid may freeze during parking, this can cause some they deteriorate in urea supply module.In order to protect the parts in urea supply module can not crack because of the icing pressure of urea liquid, special measure emptying urea supply module after motor end of run must be adopted.
Such as, in the prior art shown in Fig. 1, a kind of selective catalytic reduction system operating mainly comprises reducing agent supply connection and auxiliary air circuit.Described reducing agent supply connection is used for the reducing agent in reducing agent tank 1 to be fed to metering valve 5 through prefilter 2, main pump module 3, main filtration and pressure pulse damping module 4 successively, and this metering valve 5 is for being mapped to injection of reducing agent in outlet pipe.In reducing agent supply connection, reducing agent pressure transducer 6 is also housed.Described service line air routing compaction air-source 7 is drawn and with air switching valve 8, for being fed to by pressurized air in reducing agent stream that metering valve 5 sprays, to contribute to atomization and the setting of reducing agent.
In addition, described selective catalytic reduction system operating also comprises the reducing agent reflux line be connected in parallel to each other and reducing agent cleaning circuit of being drawn by reducing agent supply connection.Backflow module 10 is housed in described reducing agent reflux line, and the excess reductant be provided in reducing agent supply connection is back to reducing agent tank 1.Cleaning pump module 11 is housed, for being withdrawn in reducing agent tank 1 by the reducing agent remained in metering valve 5 after engine misses in described reducing agent cleaning circuit.
Cleaning pump in above-mentioned cleaning pump module 11 adopts the diaphragm pump of Electromagnetic Control usually, controls its armature linearly move by pulse width modulation control signal, thus is extracted out from metering valve 5 by residual reducing agent and be transmitted back to reducing agent tank 1.This cleaning pump needs well-designed in Stroke Control, seal protection and reduction noise etc.In addition, cleaning pump has very complicated structure, and the cost of whole selective catalytic reduction system operating thus can be caused to increase.
Summary of the invention
For above-described reason, the object of the application is to provide a kind of selective catalytic reduction system operating that at least can reduce costs.
According to an aspect of the application, provide a kind of selective catalytic reduction system operating, comprising: the reducing agent tank that accommodate reducing agent; Metered injection module, it reducing agent injection channel comprising the metering valve for measuring reducing agent and reducing agent is sprayed; Be connected to the reducing agent supply connection for supplying reducing agent to metering valve between reducing agent tank and metering valve; Source of compressed air; The auxiliary air circuit simultaneously operated with reducing agent supply connection, its upstream extremity is connected to described source of compressed air, and downstream leads to the outlet of described reducing agent injection channel, to spray the pressurized air from described source of compressed air to reducing agent stream; And reducing agent cleaning circuit, its upstream extremity is connected to described source of compressed air, downstream leads to described reducing agent injection channel, described reducing agent cleaning circuit is controlled so as to operate after reducing agent supply connection and auxiliary air line loop operation terminate, to spray the pressurized air from described source of compressed air to described metering valve, thus the remaining reducing agent in metering valve is forced to reflux towards the direction of reducing agent tank.
According to a kind of embodiments possible of the application, in described auxiliary air circuit, be provided with the first air switching valve controlling its break-make, in described reducing agent cleaning circuit, be provided with the second air switching valve controlling its break-make.
According to a kind of embodiments possible of the application, described auxiliary air circuit comprises the additional air flow passage being positioned at metered injection module, and the end of described additional air flow passage is with stop valve.
According to a kind of embodiments possible of the application, described additional air flow passage is made up of metal pipe element.
According to a kind of embodiments possible of the application, when reducing agent cleaning line loop operation, the pressure in described source of compressed air is at 5 bar or more.
According to a kind of embodiments possible of the application, described auxiliary air circuit is connected by the outlet of switching member with described metering valve, described switching member is configured to, under the non-operating state of reducing agent cleaning circuit, keep the outlet of described reducing agent injection channel unimpeded, and close the outlet of described reducing agent injection channel under the serviceability of reducing agent cleaning circuit.
According to a kind of embodiments possible of the application, described switching member is air pressure control type switching valve, and it utilizes the reducing agent air pressure of clearing up in circuit to realize valve position switching.
According to a kind of embodiments possible of the application, also comprise from reducing agent supply connection branch out and lead to the reducing agent reflux line of reducing agent tank.
According to a kind of embodiments possible of the application, described reducing agent reflux line is in parallel with the Upstream section of described reducing agent supply connection, comprises main pump module and main filtration and pressure pulse damping module in the described Upstream section of described reducing agent supply connection.
According to a kind of embodiments possible of the application, described auxiliary air circuit is configured to be connected with metered injection module in the following manner, and the pressurized air namely carried by auxiliary air circuit mixes to make reducing agent enter outlet pipe with drop size at a predetermined angle with the reducing agent sprayed by reducing agent injection channel.
Comprise according to the selective catalytic reduction system operating of the application and use compressed-air actuated auxiliary air circuit and reducing agent cleaning circuit, eliminate cleaning pump expensive in prior art, thus the cost of whole selective catalytic reduction system operating can reduce.
Meanwhile, the selective catalytic reduction system operating according to the application have employed after based on compressed-air actuated reducing agent cleaning circuit, and the clean up time of remaining reducing agent can shorten, thus can reduce the energy consumption of Vehicular battery.
Accompanying drawing explanation
Fig. 1 is a kind of schematic diagram of existing motor exhaust selective catalytic reduction system operating.
Fig. 2 is the schematic diagram of the motor exhaust selective catalytic reduction system operating of a mode of execution according to the application.
Fig. 3 is the partial schematic diagram of a kind of remodeling of selective catalytic reduction system operating in Fig. 2.
Fig. 4,5 is schematic diagram of operable a kind of switching valve in the metered injection module of selective catalytic reduction system operating in Fig. 3.
Fig. 6 is the selective catalytic reduction system operating of the application and the comparison diagram of the selective catalytic reduction system operating of prior art in reducing agent clean up time.
Embodiment
The preferred implementation of the application is described with reference to the accompanying drawings.
Fig. 2 shows the selective catalytic reduction system operating of a mode of execution according to the application, in the tail gas to motor, especially diesel engine with the flow injection reduction agent of certain pressure and metering.Described reducing agent can be normally used urea liquid, such as AdBlue, and it is stored in reducing agent tank 1.
Described selective catalytic reduction system operating comprises a reducing agent supply connection, it comprises the pipeline or passage (reducing agent service duct) L1 that originate in reducing agent tank 1 and the prefilter 2 be arranged in successively from the side near reducing agent tank 1 in passage L1, main pump module 3, main filtration and pressure pulse damping module 4, passage L1 ends at the metered injection module (its general structure not shown) carried by waste pipe, described metered injection module comprises and is positioned at its intrinsic metering valve 5, the output terminal of described metering valve 5 is made up of passage (reducing agent injection channel) 5a and the outlet 5b being positioned at channel end.
After main pump module 3 starts, the reducing agent in reducing agent tank 1 is fed in metered injection module along the direction F1 shown in arrow through passage L1.The prefilter 2 being placed in main pump module 3 upstream in passage L1 filters out the coarse granule in reducing agent.
Main pump module 3 comprises main pump 3a and is arranged in one-way valve 3b and 3c of main pump 3a upstream and downstream.These two one-way valves are orientated and the reducing agent in passage L1 can only be flowed along direction F1.Be appreciated that in the mode of execution simplified, in main pump module 3, only can arrange an one-way valve.
Main filtration and pressure pulse damping module 4 is settled, its pressure pulse damping 4b mainly comprising main filter 4a and be connected to main filter 4a in the downstream side of main pump module 3.Main filter 4a is for filtering out the fine grained in reducing agent.Pressure pulse damping 4b can be the form of accumulator, when the pressure in passage L1 raises or reduce, can absorb or discharge the pressure that it stores, to alleviate the pressure surge in passage L1.Reducing agent pressure transducer 6 is connected to passage L1 in the downstream of main filtration and pressure pulse damping module 4, for the pressure in the tract of sense channel L1, the i.e. incoming pressure of metered injection module.
Described selective catalytic reduction system operating also comprises the reducing agent reflux line of being drawn by reducing agent supply connection.Described reducing agent reflux line comprises pipeline or passage (return flow line) L2 and is arranged on the backflow module 10 in passage L2, is back to reducing agent tank 1 for making the excess reductant in reducing agent supply connection when selective catalytic reduction system operating works along the backflow direction F2 shown in arrow.The Upstream section of passage L2 and passage L1 (namely comprising that section of main pump module 3 and main filtration and pressure pulse damping module 4) is in parallel.Backflow module 10 comprises and is arranged in return filter 10a, flow controller 10b and one-way valve 10c in passage L2 successively along backflow direction F2.This one-way valve 10c is orientated and the reducing agent in passage L2 can only be flowed along backflow direction F2.
Described selective catalytic reduction system operating also comprises source of compressed air 7 and is connected to the auxiliary air circuit of source of compressed air 7.Source of compressed air 7 can be the source of compressed air in independent air pump or vehicle.Described auxiliary air circuit in the example in the figures major embodiment is the form of pipeline or passage (the first compressed air channel) L3, the upstream extremity of passage L3 is connected to described source of compressed air 7, the downstream of passage L3 is led in the outlet 5b of the passage 5a of metered injection module, for the pressurized air from source of compressed air 7 being fed to the reducing agent stream sprayed by metering valve 5, to contribute to that reducing agent atomization is had suitable angle of spraying for having very little drop size and being shaped to.In the downstream of source of compressed air 7, first air switching valve 8 is housed in passage L3, for the break-make of control channel L3, controls the supply of the reducing agent stream that pressurized air sprays to metering valve 5 thus.
Mix with the pressurized air from passage L3 after passage L1 is measured valve 5 ejection from the reducing agent that reducing agent tank 1 receives, the reducing agent produced and compressed-air actuated mixture are injected in outlet pipe.The tail gas of motor flows in outlet pipe, and mixes further reduction reaction to occur and eliminates part NOx with compressed-air actuated mixture with reducing agent.
The metering valve 5 of various structure is all applicable to the application, only schematically depict metering valve 5 in Fig. 2, and its input port is connected to the downstream of passage L1, and output port (i.e. passage 5a and outlet 5b thereof) is towards outlet pipe.The outlet 5b of passage 5a is configured so that the form of reducing agent stream in diffusion sprayed.The reducing agent of discharging from passage 5a mixes with the pressurized air of discharging from passage L3, to make reducing agent be atomized, and forms reducing agent and compressed-air actuated mixture and enters in outlet pipe.
The selective catalytic reduction system operating of the application also comprises the reducing agent cleaning circuit of drawing from source of compressed air 7, its in the example in the figures major embodiment be the form of pipeline or passage (the second compressed air channel) L4, the upstream extremity of described passage L4 is joined in the upstream of the first air switching valve 8 and passage L3, the downstream of passage L4 is arranged in passage 5a, and the downstream of passage L4 is with stop valve, this stop valve allows the pressurized air ejection in passage L4, but does not allow in the reducing agent inlet passage L4 in passage 5a.
Second air switching valve 12 is housed, for the break-make of control channel L4 in passage L4.The effect of reducing agent cleaning circuit is after the catalytic reduction end-of-job of selective catalytic reduction system operating, utilize the pressurized air from source of compressed air 7 to be back in reducing agent tank 1 along inverse direction F3 shown in arrow by the remaining reducing agent in metered injection module.
The part of passage L4 in metered injection module body is made up of additional air flow passage, such as metal pipe element.The end of described additional air flow passage forms the downstream of passage L4.
Briefly introduce the work of the selective catalytic reduction system operating of the application below.(such as start vehicle by driver with car key) after the engine started, the main pump 3a of main pump module 3 starts, to make the reducing agent in reducing agent tank 1 be fed in metering valve 5 along direction F1 through passage L1, and eject through passage 5a.Now, the first air switching valve 8 in auxiliary air circuit is opened, and the second air switching valve 12 in reducing agent cleaning circuit is closed, and source of compressed air 7 works and is fed in the reducing agent jet flow of metering valve 5 through passage L3 by pressurized air.Now, reducing agent cleaning line-down, namely passage L4 does not have air to flow.The pressurized air that passage L3 exports guides the reducing agent stream outputted in outlet 5b via passage 5a to enter outlet pipe with drop size at a predetermined angle, realizes the catalytic reduction process of tail gas.
When (such as vehicle being stopped working with car key by driver) after tail-off, reducing agent supply connection and the power cut-off of auxiliary air circuit, and reducing agent cleaning circuit is started working.Specifically, the main pump 3a of main pump module 3 closes, and no longer includes reducing agent from reducing agent tank 1 suction passage L1.Source of compressed air 7 keeps work, but the first air switching valve 8 in auxiliary air circuit is closed, and the second air switching valve 12 in reducing agent cleaning circuit is opened.Downstream due to passage L4 passes in passage 5a, therefore, the compressed-air actuated part sprayed through passage L4 sprays in metering valve 5, force in metering valve 5 and reducing agent in passage L1 tract along inverse direction F3 through the backflow of passage L1 tract, be then back in reducing agent tank 1 along backflow direction F2 through passage L2.Like this, in metered injection module the remaining reducing agent of (even passage L1 tract and passage L2 in) is cleaned.
Test shows, although there is gap can cause compressed air leakage between the downstream-end opening and the outlet 5b of passage 5a of passage L4, but still the remaining reducing agent in metered injection module empties by the pressurized air that source of compressed air 7 can be utilized to provide, as hereinafter described.
In the example shown in Fig. 2, reducing agent cleaning circuit has simple structure.But, be appreciated that said structure and imperfections.Such as, there is gap between the downstream-end opening of passage L4 and the outlet 5b of passage 5a, this can cause compressed-air actuated leakage.When the air pressure of source of compressed air 7 is higher, this leakage is favourable, because in the tract that strong pressurized air can be avoided to be blown into passage L1 and passage L2, even enter in reducing agent tank 1.
But if the air pressure of source of compressed air 7 is lower, the efficiency that this leakage must cause reducing agent to be cleared up is low, the time is long.When the air pressure of source of compressed air 7 is lower, in order to avoid the problems referred to above, remodeling according to Fig. 3, the downstream of passage L4 can be connected to passage 5a in the mode of changeable state, namely, when reducing agent cleaning line work, set up between passage L4 with passage 5a and be communicated with, and the outlet of closing passage 5a, and when reducing agent cleaning line-down, the outlet of passage 5a keeps unimpeded.
This catalytic reduction operation in metering valve 5 can be realized by various mode with the switching function of cleaning operation, such as, is realized by custom-designed switching valve 14 between passage L4 and passage 5a.
Fig. 4,5 shows a kind of schematic diagram that may be used for realizing two switching valves of above-mentioned switching.This switching valve comprises two spool sections, i.e. the first spool section (that section of right side shown in figure) and the second spool section (that section of left side shown in figure).This switching valve is air pressure control type, and its spool can switch under the effect of air pressure in passage L4 between two valve position.Spool comprises two spool sections.First spool section has two input ports A, B and an output port C successively.Input port A closes, and input port B is communicated with output port C.Second spool section has two input ports A1, B1 and an output port C1 successively.Input port A1 is communicated with input port B 1, and output port C1 closes.
Under normal conditions, namely under engine behavior, spool makes input port A, B in its first spool section dock with passage L4, passage 5a respectively under the action of the spring, and output port C docks with the outlet of passage 5a, as shown in Figure 4.In this state, described switching valve keeps passage 5a unimpeded to its outlet, and the reducing agent supply connection of selective catalytic reduction system operating and the work of auxiliary air circuit, to realize the catalytic reduction process of tail gas.
After the engine is shut off, reducing agent supply connection and the power cut-off of auxiliary air circuit, and reducing agent cleaning circuit is started working.Now, the pressurized air inlet passage L4 of source of compressed air 7, pneumatic control valve core in passage L4 moves and makes the second spool section move to the position of original first spool section, input port A1, B1 wherein in the second spool section dock with passage L4,5a respectively, output port C1 docks with the outlet of passage 5a, as shown in Figure 5.In this state, passage L4 is communicated with passage 5a, and the outlet of passage 5a is closed, and this makes the pressurized air from passage L4 can reverse flow in passage 5a, to realize the cleaning operation of reducing agent.
Be appreciated that those skilled in the art are after having read the application, other above-mentioned catalytic reduction realized in metered injection module can be envisioned and operate the switching member switched between cleaning operation.Such as, adopt rotary type or the sliding-type gate simply with reset function (such as spring reset), keep passage 5a unimpeded to its outlet when it does not have pressurized air in passage L4, and have in passage L4 during pressurized air and move to the position outlet of passage 5a blocked.
Above-mentionedly utilize compressed-air actuated reducing agent to clear up after circuit have employed, need in the control program of tail gas selective catalytic reducing system to remove cleaning pump control logic, and add new pressurized air cleaning control logic, comprise the control of air pressure switch valve.In order to monitor the air pressure in auxiliary air circuit and reducing agent cleaning circuit, can the air pressure probe 13 being connected to passage L3 be set, as shown in Figure 2 in the downstream of source of compressed air 7.
In order to verify the reducing agent cleaning ability of the selective catalytic reduction system operating of the application, clean up time is used as one of performance standard and is tested.For this reason, the reducing agent clean up time tested for comparing the application and prior art has been carried out.
In test, on test stand, the employing air of the application shown in test chart 2 assists the model machine of the selective catalytic reduction system operating of liquidating plan and the selective catalytic reduction system operating with cleaning pump of prior art.For the pipe fitting of 3 meters that are filled with reducing agent long, clean up time test is carried out to the selective catalytic reduction system operating with cleaning pump of prior art, and with different air pressure range 2 bar to 6 bar, clean up time test is carried out to the selective catalytic reduction system operating of the application.
Fig. 6 show prior art with cleaning the selective catalytic reduction system operating of pump and the employing air of the application assist the clean up time of the selective catalytic reduction system operating of liquidating plan to compare.What in figure, air pressure was that 0 Ba Chu represents is the clean up time of prior art selective catalytic reduction system operating, the clean up time of what air pressure was respectively that 2,3,4,5,6 Ba Chu represent the is selective catalytic reduction system operating of the application, cleaning pressurized air takes from the Laboratory air source under room temperature.Can find out, the selective catalytic reduction system operating of the application utilizes air to assist the clean up time of cleaning shorter than cleaning pump.Such as, under 6 bar air pressures, with compared with the selective catalytic reduction system operating clearing up pump, clean up time was reduced to 8 seconds from 55 seconds.
Can find out based on experimental result, the air of the application assists liquidating plan can clear up reducing agent with the shorter time.
Be appreciated that when switching member is not set between passage L4 and passage 5a, exist for the pressurized air of reducing agent cleaning in passage L4 and reveal.Therefore, if the pressure of source of compressed air 7 is lower, then reducing agent clearance time can be longer.For this reason, in such configuration, wish that pressure when reducing agent cleaning operation in source of compressed air 7 is at 5 bar or more.
Assist in the selective catalytic reduction system operating of liquidating plan at the employing air of the application, eliminate cleaning pump module 11 of the prior art shown in Fig. 1, add an air switching valve 12, and transformed metered injection module body and make it that there is additional air flow passage and presumable switching construction.Because the cost clearing up pump module is very high, therefore the air of the application assists liquidating plan significantly to reduce costs.In addition, clear up pump module to be difficult to owing to having complicated plastics/rubber structure manufacture.The metal additional air flow passage that the air of the application assists liquidating plan to employ to transform out in standard null air valve and metered injection module body, thus easily manufactures.
The air of the application assists another advantage of liquidating plan to be save Vehicular battery energy.In the prior art, after the engine is shut off, cleaning pump utilizes the electric energy work from Vehicular battery, needs to consume larger electric energy.Utilize the air of the application to assist liquidating plan, the power consumption of air switching valve is far below cleaning pump, and this causes Vehicular battery energy consumption to reduce.
Although describe the application with reference to concrete mode of execution here, the scope of the application is not limited to shown details.When not departing from the basic principle of the application, various amendment can be made for these details.
Claims (10)
1. a selective catalytic reduction system operating, comprising:
Accommodate the reducing agent tank of reducing agent;
Metered injection module, it reducing agent injection channel comprising the metering valve for measuring reducing agent and reducing agent is sprayed;
Be connected to the reducing agent supply connection for supplying reducing agent to metering valve between reducing agent tank and metering valve;
Source of compressed air;
The auxiliary air circuit simultaneously operated with reducing agent supply connection, its upstream extremity is connected to described source of compressed air, and downstream leads to the outlet of described reducing agent injection channel, to spray the pressurized air from described source of compressed air to reducing agent stream; And
Reducing agent cleaning circuit, its upstream extremity is connected to described source of compressed air, downstream leads to described reducing agent injection channel, described reducing agent cleaning circuit is controlled so as to operate after reducing agent supply connection and auxiliary air line loop operation terminate, to spray the pressurized air from described source of compressed air to described metering valve, thus the remaining reducing agent in metering valve is forced to reflux towards the direction of reducing agent tank.
2. selective catalytic reduction system operating as claimed in claim 1, wherein, is provided with the first air switching valve controlling its break-make in described auxiliary air circuit, be provided with the second air switching valve controlling its break-make in described reducing agent cleaning circuit.
3. selective catalytic reduction system operating as claimed in claim 1 or 2, wherein, described auxiliary air circuit comprises the additional air flow passage being positioned at metered injection module, and the end of described additional air flow passage is with stop valve.
4. selective catalytic reduction system operating as claimed in claim 3, wherein, described additional air flow passage is made up of metal pipe element.
5. the selective catalytic reduction system operating according to any one of Claims 1-4, wherein, when reducing agent cleaning line loop operation, the pressure in described source of compressed air is at 5 bar or more.
6. selective catalytic reduction system operating as claimed in claim 1 or 2, wherein, described auxiliary air circuit is connected by the outlet of switching member with described metering valve, described switching member is configured to, under the non-operating state of reducing agent cleaning circuit, keep the outlet of described reducing agent injection channel unimpeded, and close the outlet of described reducing agent injection channel under the serviceability of reducing agent cleaning circuit.
7. selective catalytic reduction system operating as claimed in claim 6, wherein, described switching member is air pressure control type switching valve, and it utilizes the reducing agent air pressure of clearing up in circuit to realize valve position switching.
8. the selective catalytic reduction system operating according to any one of claim 1 to 7, wherein, also comprises from reducing agent supply connection branch out and lead to the reducing agent reflux line of reducing agent tank.
9. selective catalytic reduction system operating as claimed in claim 8, wherein, described reducing agent reflux line is in parallel with the Upstream section of described reducing agent supply connection, comprises main pump module and main filtration and pressure pulse damping module in the described Upstream section of described reducing agent supply connection.
10. selective catalytic reduction system operating as claimed in any one of claims 1-9 wherein, wherein, described auxiliary air circuit is configured to be connected with metered injection module in the following manner, and the pressurized air namely carried by auxiliary air circuit mixes to make reducing agent enter outlet pipe with drop size at a predetermined angle with the reducing agent sprayed by reducing agent injection channel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410311159.5A CN105464762B (en) | 2014-07-01 | 2014-07-01 | Selective catalytic reduction system operating |
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| CN201410311159.5A CN105464762B (en) | 2014-07-01 | 2014-07-01 | Selective catalytic reduction system operating |
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| CN105464762A true CN105464762A (en) | 2016-04-06 |
| CN105464762B CN105464762B (en) | 2019-08-20 |
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Also Published As
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| CN105464762B (en) | 2019-08-20 |
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Address after: 214028 No.17 Xinhua Road, national high tech Industrial Development Zone, Wuxi City, Jiangsu Province Patentee after: Bosch powertrain Co.,Ltd. Address before: 214028 No.17 Xinhua Road, national high tech Industrial Development Zone, Wuxi City, Jiangsu Province Patentee before: Bosch Automotive Diesel Systems Co.,Ltd. |
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