CN109386364A - Waste gas cleaning system - Google Patents
Waste gas cleaning system Download PDFInfo
- Publication number
- CN109386364A CN109386364A CN201810885545.3A CN201810885545A CN109386364A CN 109386364 A CN109386364 A CN 109386364A CN 201810885545 A CN201810885545 A CN 201810885545A CN 109386364 A CN109386364 A CN 109386364A
- Authority
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- China
- Prior art keywords
- reducing agent
- catalyst device
- exhaust pipe
- concentration
- catalyst
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
- F01N13/0093—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are of the same type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/04—Sulfur or sulfur oxides
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The present invention provides the reduced waste gas cleaning system of NOx purifying property caused by capable of preventing because of catalyst poisoning.Waste gas cleaning system has: first choice reduction catalyst device, is set to out of, the exhaust gas that internal combustion engine is discharged is passed through exhaust pipe, has the selective reduction type catalyst for having used vanadium；First ejection section is set to the upstream side of the first choice reduction catalyst device in exhaust pipe, sprays reducing agent；And the second selective reduction type catalyst device, it is set to the downstream side of first choice reduction catalyst device in exhaust pipe, there is the selective reduction type catalyst for having used copper.
Description
Technical field
The present invention relates to waste gas cleaning systems.
Background technique
Waste gas purification as the NOx for purifying and carrying in the exhaust gas of the diesel engine of the vehicles such as truck or bus
System, develop by urea water etc. be used as reducing agent by NOx be reduced to nitrogen and water selecting catalyst reduction (SCR:
Selective Catalytic Reduction) system (for example, referring to patent document 1).
In selecting catalyst also original system, the urea water in urea water pot will be stored in selective reduction type catalyst device
(SCR) the exhaust pipe supply of upstream, is generated ammonia for hydrolysis of urea using the heat of exhaust gas, is urged by the ammonia using selective reduction type
Selective reduction type catalyst in agent device restores NOx.Such as the urea water injection by being set in exhaust channel
Device appropriately sprays urea water.
Existing technical literature
Patent document
Patent document 1: Japanese Unexamined Patent Publication 2000-303826 bulletin
Summary of the invention
Problems to be solved by the invention
But there are the following problems: if the sulphur ingredient (S) or noble metal component (Pt) that include in exhaust gas are attached to selection also
The front surface of prototype catalyst, then cause using the selective reduction type catalyst carry out NOx purifying property reduction (hereinafter,
Also referred to as catalyst poisoning).Particularly, if noble metal component is attached to the front surface of selective reduction type catalyst, from urea
The ammonia generated after water ejector injection can aoxidize, and the NOx carried out using selective reduction type catalyst is interfered to purify.Therefore, in order to
Prevent catalyst poisoning, it may be considered that be catalyzed using the selective reduction type catalyst for having used vanadium, but by the selective reduction type
The NOx purifying property that agent carries out was originally lower, it is possible to cannot achieve stringent NOx limitation.
The reduction of NOx purifying property caused by the object of the present invention is to provide that can prevent because of catalyst poisoning is given up
Gas purification system.
Solution to problem
Waste gas cleaning system of the invention has:
First choice reduction catalyst device is set to out of, the exhaust gas that internal combustion engine is discharged is passed through exhaust pipe, tool
There is the selective reduction type catalyst for having used vanadium；
First ejection section is set to the upstream side of the first choice reduction catalyst device in the exhaust pipe,
Spray reducing agent；And
Second selective reduction type catalyst device is set to the first choice reduction catalyst in the exhaust pipe
The downstream side of device has the selective reduction type catalyst for having used copper.
Invention effect
In accordance with the invention it is possible to the reduction of NOx purifying property caused by preventing because of catalyst poisoning.
Detailed description of the invention
Fig. 1 is the figure for indicating the structure of the vehicle in present embodiment.
Fig. 2 is the flow chart for indicating the injection control processing in present embodiment.
Description of symbols
1 vehicle
10 internal combustion engines
11 combustion chambers
13 fuel injectors
15 intake valves
17 exhaust valves
19 pistons
20 exhaust systems
21 exhaust pipes
22,26 reducing agent injector
23A DOC
23B DPF
23C、23D SCR
24 temperature sensors
25 concentration sensors
40 control units
41 temperature obtaining portion
42 concentration obtaining portion
43 determination units
44 jet controling parts
50 air inlets piping
Specific embodiment
Hereinafter, the embodiments of the present invention will be described with reference to the drawings.Fig. 1 is the vehicle 1 indicated in present embodiment
Structure figure.As shown in Figure 1, equipped with internal combustion engine 10, exhaust system 20 and control unit in the vehicles such as truck or bus 1
40 (specifically DSU).Exhaust system 20 and control unit 40 play the function as waste gas cleaning system.
Firstly, being illustrated to the structure of internal combustion engine 10.Internal combustion engine 10 is, for example, diesel engine.In the combustion of internal combustion engine 10
It burns in room 11, fuel injector 13 sprays fuel into combustion chamber 11.In addition, fuel injector 13 can also be to combustion chamber 11
Fuel is sprayed in air inlet.Combustion is controlled by ECM (Engine Control Module, engine control module are not shown)
The injection of material.In addition, the fuel in combustion chamber 11 is compressed by the movement of piston 19, to burn.
Intake valve 15 and exhaust valve 17 are configured to be opened and closed.It, will be from air inlet piping 50 by opening intake valve 15
New air be sucked into combustion chamber 11.In addition, by opening exhaust valve 17, the exhaust gas that will be generated after fuel combustion in combustion chamber 11
It is sent to exhaust system 20 (specifically exhaust pipe 21).
Then, the structure of exhaust system 20 is illustrated.Exhaust system 20 is for example set to the lower part of vehicle 1, mainly
With metal exhaust pipe 21.The exhaust gas that the exhaust pipe 21 generates the burning for passing through fuel in internal combustion engine 10 is into atmosphere
(outside vehicle) guidance.
In addition, in the midway of exhaust pipe 21, in order to which waste gas purification (innoxious) is provided with various aftertreatment devices.
In the present embodiment, it as aftertreatment device, is provided with DOC (oxidation catalyst) 23A, DPF23B, SCR23C and (corresponds to
" first choice reduction catalyst device " of the invention), SCR23D (" the second selective reduction type catalyst dress of the invention
Set ").
Rhodium, cerium oxide, platinum, aluminium oxide etc. are supported in metal carrying body to form DOC23A.DOC23A is by exhaust gas
In include hydrocarbon (HC) and carbon monoxide (CO) decompose remove.In addition, DOC23A also has to account in exhaust gas includes
NOx most nitric oxide (NO) oxidation and generate nitrogen dioxide (NO2) function.It, can by utilizing the function
Improve the NOx purification efficiency of SCR23C, SCR23D.
In exhaust pipe 21, configured in the upstream side (the specifically upstream side on the flow direction of exhaust gas) of DOC23A
There is the fuel as fuel supplying part to supply injector (not shown), fuel supply injector is temporarily supplied into exhaust gas
Fuel aoxidizes the hydrocarbon (HC) in fuel in DOC23A, and so that exhaust gas is heated up using its oxidation reaction heat.
DPF23B is single as made of alternately blocking the entrance and exit in the cellular channel (core lattice) of porous ceramic
The wall-flow filter of block formula honeycomb (monolith honeycomb) type is formed.DPF23B traps and removes for including in exhaust gas
Particulate matter (PM).
In exhaust pipe 21, in side farther downstream than DPF23B (the specifically downstream side on the flow direction of exhaust gas)
And than the position of SCR23C upstream side, it is provided with for spraying (specifically spraying) as the urea water of reducing agent
Reducing agent injector 22 (corresponding to " the first ejection section " of the invention).
In addition it is also possible to be arranged in the position of side farther downstream than reducing agent injector 22 in exhaust gas in exhaust pipe 21
In the urea water ejected from reducing agent injector 22 is stirred to the mixer that spreads it equably.
In exhaust pipe 21, the entrance of SCR23C is provided with temperature sensor 24.Temperature sensor 24 is used in
In the injection control of the urea water carried out by reducing agent injector 22, the temperature of exhaust gas is detected, and will indicate the temperature
The signal of degree is exported to control unit 40.
SCR23C for example with cylindrical shape, has the honeycomb substrate by ceramic making.It supports or applies on honeycomb wall surface
Plating has used the catalyst (hereinafter referred to as vanadium catalyst) of vanadium.In this way, due to SCR23C have vanadium catalyst, so have with
Lower characteristic: even if the sulphur ingredient (S) or noble metal component (Pt) that include in exhaust gas are attached to the front surface of SCR23C, it is also difficult to lead
Cause the reduction (in other words, strong to the tolerance of catalyst poisoning) by the SCR23C NOx purifying property carried out.
SCR23C as described above is configured at the downstream side of DPF23B in exhaust pipe 21.In addition, in exhaust pipe 21,
Between DPF23B and SCR23C, urea water as reducing agent is sprayed by reducing agent injector 22, to supply to passing through
In the exhaust gas of DPF23B.As a result, urea water is hydrolyzed to ammonia.Exhaust gas comprising ammonia passes through vanadium catalyst near the surface layer SCR23C
Effect, make nitrogen oxides (so-called NOx) reaction be nitrogen and water (reduction reaction).It is as a result, that the nitrogen oxides in exhaust gas is net
Change.
Here, hydrolysis is occurred when the temperature of the exhaust gas by SCR23C is predetermined temperature (for example, 200 DEG C) or more
's.Therefore, in the present embodiment, reducing agent injector 22 is 200 DEG C or more in the temperature for the exhaust gas for flowing into SCR23C
In the case of, urea water is supplied into the exhaust gas in exhaust pipe 21.The injection of urea water is controlled by control unit 40.In addition, for
Predetermined temperature (200 DEG C), is experiment and emulation etc. by the development and design stage of exhaust system 20, is considering ammonia and NOx
What reaction temperature etc. suitably determined.
SCR23D for example with cylindrical shape, has the honeycomb substrate by ceramic making.It supports or applies on honeycomb wall surface
Plating has used the catalyst (hereinafter referred to as copper catalyst) of copper.In this way, since SCR23D has copper catalyst, so with having
The SCR23C of vanadium catalyst is compared, and has characteristics that the sulphur ingredient (S) for including in the offgas or noble metal component (Pt) attachment
In the case where the front surface of SCR23D, it is easy to cause through the reduction of the SCR23D NOx purifying property carried out (in other words,
It is weaker to the tolerance of catalyst poisoning).On the other hand, compared with SCR23C, spy SCR23D high with NOx purifying property
Property.
The ammonia for being not used and leaking in reduction reaction in SCR23C passes through copper catalyst near the surface layer SCR23D
Effect, making nitrogen oxides (so-called NOx) reaction is nitrogen and water (reduction reaction).As a result, by the purification of nitrogen oxides in exhaust gas.
In addition it is also possible in the downstream side of SCR23D so that be not used in reduction reaction in SCR23C, SCR23D and
The ammonia leaked out is not released to the mode in atmosphere, configures the NH_3 leakage catalyst for removing the ammoxidation leaked out.
Concentration sensor 25 is provided between the SCR23C and SCR23D in exhaust pipe 21.The concentration sensor 25 is to logical
The concentration for having crossed the NOx for including in the exhaust gas of SCR23C is detected, and the signal for indicating the concentration is exported to control unit 40.
In addition, being provided between the SCR23C and SCR23D in exhaust pipe 21 for spraying the urea water as reducing agent
Reducing agent injector 26 (corresponding to " the second ejection section " of the invention).
Water, nitrogen, the carbon dioxide for being handled in above each aftertreatment device exhaust gas and being generated pass through noise elimination
Device (not shown) etc. is discharged in atmosphere.
Control unit 40 has CPU (Central Processing Unit, central processing unit), is stored with control program
The works such as ROM (Read Only Memory, read-only memory) and RAM (Random Access Memory, random access memory)
Act on memory etc..CPU and is cooperated to control with the control program of expansion from going out in ROM by control program read (CP read) and be unfolded in RAM
Make the execution of various processing.
As shown in Figure 1, control unit 40 has: temperature obtaining portion 41, concentration obtaining portion 42, determination unit 43 and jet controling part
44。
As described above, the upstream side in exhaust pipe 21 configures the SCR23C strong to the tolerance of catalyst poisoning, under
Swim the SCR23D that side configuration is weak to the tolerance of catalyst poisoning compared with SCR23C but NOx purifying property is high.Thereby, it is possible to make
The sulphur ingredient (S) or noble metal component (Pt) for including in exhaust gas are attached to the SCR23C of upstream side and at least keep downstream side
The NOx purifying property of SCR23D, exhaust system 20 can be prevented whole because NOx purifying property caused by catalyst poisoning drop
It is low.
When noble metal component is attached to the front surface of SCR23C, the ammoxidation that is generated after the injection of reducing agent injector 22 from
And in the case that the NOx purifying property of SCR23C reduces, the amount for reaching the ammonia of SCR23D is possible to reduce, and then SCR23D
NOx purifying property is likely to decrease.In this case, by from the reducing agent injector being set between SCR23C and SCR23D
26 injection urea waters, ammonia is stably supplied to SCR23D, to keep the NOx purifying property of SCR23D.
Then, referring to the flow chart of Fig. 2, the injection control processing example of the control unit 40 in present embodiment is said
It is bright.Injection control processing shown in Fig. 2 is to start to execute after the operating of internal combustion engine 10.
Firstly, temperature obtaining portion 41 inputs the signal exported from temperature sensor 24, the exhaust gas for passing through exhaust pipe 21 is obtained
Temperature (step S100).It is determined that whether portion 43 is to being predetermined temperature (example by the temperature obtained of temperature obtaining portion 41
Such as, 200 DEG C) more than determined (step S120).
(the step in the case where the result of judgement is to be less than predetermined temperature by the temperature obtained of temperature obtaining portion 41
S120: "No"), before the processing returns to step S100.It on the other hand, is being regulation temperature by the temperature obtained of temperature obtaining portion 41
Du or more in the case where (step S120: "Yes"), jet controling part 44 control reducing agent injector 22 start urea water injection
(step S140).
Then, concentration obtaining portion 42 inputs the signal exported from concentration sensor 25, obtains the exhaust gas for passing through exhaust pipe 21
In include NOx concentration (step S160).It is determined that whether portion 43 is to being rule by the concentration obtained of concentration obtaining portion 42
Determine concentration or more and is determined (step S180).Here, being normal concentration or more by the concentration obtained of concentration obtaining portion 42
Situation refers to, is attached to the front surface of SCR23C there are noble metal component and makes ammoxidation, to make the NOx purification property of SCR23C
The case where a possibility that capable of reducing.
(the step in the case where the result of judgement is to be less than normal concentration by the concentration obtained of concentration obtaining portion 42
S180: "No"), before the processing returns to step S180.It on the other hand, is being that regulation is dense by the concentration obtained of concentration obtaining portion 42
Du or more in the case where (step S180: "Yes"), jet controling part 44 control reducing agent injector 26 start urea water injection
(step S200).After the completion of the processing of step S200, control unit 40 terminates the processing in Fig. 2.
As described above in detail, in the present embodiment, waste gas cleaning system has: first choice reduced form is urged
Agent device (SCR23C) is set to out of, the exhaust gas that internal combustion engine 10 is discharged is passed through exhaust pipe 21, is had and has been used vanadium
Selective reduction type catalyst；First ejection section (reducing agent injector 22), the first choice reduced form being set in exhaust pipe 21
Reducing agent is sprayed in the upstream side of catalyst-assembly (SCR23C)；And the second selective reduction type catalyst device (SCR23D),
It is set to the downstream side of first choice reduction catalyst device (SCR23C) in exhaust pipe 21, has and has used the selection of copper also
Prototype catalyst.
According to the present embodiment constituted in this way, the upstream side configuration in exhaust pipe 21 is strong to catalyst poisoning tolerance
SCR23C, configuration but SCR23D that NOx purifying property high weak to catalyst poisoning tolerance compared with SCR23C in downstream side.
Thereby, it is possible to so that the sulphur ingredient (S) for including in exhaust gas or noble metal component (Pt) is attached to the SCR23C of upstream side and at least protect
The NOx purifying property for holding the SCR23D in downstream side can prevent exhaust system 20 whole because NOx is purified caused by catalyst poisoning
The reduction of performance.
In addition, in the present embodiment, having: the second ejection section (reducing agent injector 26) is set in exhaust pipe 21
First choice reduction catalyst device (SCR23C) and the second selective reduction type catalyst device (SCR23D) between, injection
Reducing agent；And control unit 40, the second ejection section (reducing agent injector 26) is controlled, makes the second ejection section in the first choosing
Select the exhaust gas passed through between reduction catalyst device (SCR23C) and the second selective reduction type catalyst device (SCR23D)
NOx concentration be normal concentration more than in the case where spray reducing agent, on the other hand NOx concentration be less than normal concentration in the case where
Do not spray reducing agent.
According to the present embodiment constituted in this way, the NOx concentration of the exhaust gas passed through between SCR23C and SCR23D is rule
Determine concentration or more and then SCR23D NOx purifying property be likely to decrease in the case where, from be set to SCR23C and SCR23D it
Between reducing agent injector 26 spray urea water.Therefore, even if making to reach SCR23D's due to the catalyst poisoning because of SCR23C
In the case of the amount of ammonia is reduced, also ammonia can be stably supplied to SCR23D, keep the NOx purifying property of SCR23D.
In addition, in the above-described embodiment, to being normal concentration or more by the concentration obtained of concentration obtaining portion 42
In the case of begin through reducing agent injector 26 progress urea water injection, on the other hand be less than normal concentration in the case where
The example for not beginning through the injection of the urea water of the progress of reducing agent injector 26 is illustrated, however, the present invention is not limited thereto.
For example, it is also possible to begin through reducing agent spray in the case where being less than normal concentration by the concentration obtained of concentration obtaining portion 42
The injection for the urea water that emitter 26 carries out.But from the cost for reducing urea water and the sight for preventing NH_3 leakage in SCR23D etc.
From the point of view of point, the amount of injection of the urea water of reducing agent injector 26 is preferably suppressed to minimum limit.That is, it is preferred that being obtained by concentration
The concentration obtained of portion 42 is that in the case where normal concentration or more, the urea water of reducing agent injector 26 the amount of injection ratio is less than
The amount of injection in the case where normal concentration is more.
In addition, above embodiment all only indicates to implement an example of materialization of the invention, technical scope of the invention is not
It should be limited by these embodiments.That is, implementing while its main points or its main feature can not departed from the present invention in a variety of manners.
The application is based in the Japanese patent application submitted on the 14th of August in 2017, (Japanese patent application laid is willing to 2017-
156578), content is introduced in this as reference.
Industrial applicibility
The present invention as that can prevent because of catalyst poisoning caused by the reduced waste gas cleaning system of NOx purifying property be
Useful.
Claims (3)
1. a kind of waste gas cleaning system, which is characterized in that have:
First choice reduction catalyst device is set to out of, the exhaust gas that internal combustion engine is discharged is passed through exhaust pipe, and having makes
With the selective reduction type catalyst of vanadium；
First ejection section is set to the upstream side of the first choice reduction catalyst device in the exhaust pipe, injection
Reducing agent；And
Second selective reduction type catalyst device is set to the first choice reduction catalyst device in the exhaust pipe
Downstream side, have and used the selective reduction type catalyst of copper.
2. waste gas cleaning system as described in claim 1, which is characterized in that have:
Second ejection section, the first choice reduction catalyst device being set in the exhaust pipe and second selection
Between reduction catalyst device, reducing agent is sprayed；And
Control unit, between the first choice reduction catalyst device and the second selective reduction type catalyst device
By exhaust gas NOx concentration be normal concentration or more in the case where, to be less than the normal concentration in the NOx concentration
Situation is compared, and the mode for increasing the amount of injection of the reducing agent controls second ejection section.
3. waste gas cleaning system as claimed in claim 2, which is characterized in that
The control unit controls second ejection section, makes second ejection section in the NOx concentration rule
Determine to spray the reducing agent in the case where concentration or more, not sprayed in the case where the NOx concentration is less than the normal concentration
The reducing agent.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017-156578 | 2017-08-14 | ||
| JP2017156578A JP2019035360A (en) | 2017-08-14 | 2017-08-14 | Exhaust emission control system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109386364A true CN109386364A (en) | 2019-02-26 |
| CN109386364B CN109386364B (en) | 2021-08-13 |
Family
ID=65417520
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810885545.3A Active CN109386364B (en) | 2017-08-14 | 2018-08-06 | Exhaust gas purification system |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2019035360A (en) |
| CN (1) | CN109386364B (en) |
| PH (1) | PH12018000215B1 (en) |
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| US8505282B2 (en) * | 2011-09-09 | 2013-08-13 | GM Global Technology Operations LLC | Selective catalytic reduction (SCR) device control system |
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- 2017-08-14 JP JP2017156578A patent/JP2019035360A/en active Pending
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- 2018-08-10 PH PH12018000215A patent/PH12018000215B1/en unknown
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Also Published As
| Publication number | Publication date |
|---|---|
| PH12018000215A1 (en) | 2019-03-04 |
| CN109386364B (en) | 2021-08-13 |
| PH12018000215B1 (en) | 2019-03-04 |
| JP2019035360A (en) | 2019-03-07 |
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