GB2592859A - Process for cooling a SCR dozer for a catalytic exhaust of an automotive vehicle - Google Patents
Process for cooling a SCR dozer for a catalytic exhaust of an automotive vehicle Download PDFInfo
- Publication number
- GB2592859A GB2592859A GB1915132.3A GB201915132A GB2592859A GB 2592859 A GB2592859 A GB 2592859A GB 201915132 A GB201915132 A GB 201915132A GB 2592859 A GB2592859 A GB 2592859A
- Authority
- GB
- United Kingdom
- Prior art keywords
- dozer
- scr
- purging
- urea solution
- aqueous urea
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000003197 catalytic effect Effects 0.000 title claims abstract description 19
- 238000001816 cooling Methods 0.000 title claims abstract description 9
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000004202 carbamide Substances 0.000 claims abstract description 39
- 238000010926 purge Methods 0.000 claims abstract description 24
- 238000010531 catalytic reduction reaction Methods 0.000 claims abstract description 7
- 239000000243 solution Substances 0.000 description 23
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 239000002826 coolant Substances 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 101001065948 Homo sapiens Purine-rich element-binding protein gamma Proteins 0.000 description 2
- 102100032081 Purine-rich element-binding protein gamma Human genes 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000013386 optimize process Methods 0.000 description 1
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
- 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
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
- F01N3/2046—Periodically cooling catalytic reactors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9413—Processes characterised by a specific catalyst
- B01D53/9418—Processes characterised by a specific catalyst for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas
-
- 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
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
-
- 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
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
-
- 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
- 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]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
-
- 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
- F01N9/00—Electrical control of exhaust gas treating apparatus
-
- 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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/11—Adding substances to exhaust gases the substance or part of the dosing system being cooled
-
- 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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1406—Storage means for substances, e.g. tanks or reservoirs
-
- 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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1433—Pumps
-
- 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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
-
- 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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1493—Purging the reducing agent out of the conduits or nozzle
-
- 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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
- F01N2900/1806—Properties of reducing agent or dosing system
- F01N2900/1811—Temperature
-
- 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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
- F01N2900/1806—Properties of reducing agent or dosing system
- F01N2900/1821—Injector parameters
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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
- Y02T10/40—Engine management systems
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Cooling a selective catalytic reduction (SCR) dozer 16 for a catalytic exhaust of an automotive vehicle, the process comprising, after an engine shut off, the following steps: a) at least a purging-filling cycle (C) followed by a thermal exchange phase (ThP), and b) a final purging step, wherein the purging-filling cycle comprises the steps of purging an aqueous urea solution (14) out of the SCR dozer, and filling the SCR dozer with the aqueous urea solution, wherein said thermal exchange phase consists of letting the aqueous urea solution inside the SCR dozer, and wherein the final purging step consists in purging the aqueous urea solution out of the SCR dozer. Each sequence of purging filling cycle and thermal exchange phase may be activated when a thermal threshold has been reached and the final purging cycle may begin when a second thermal threshold has been reached, which is lower than the first.
Description
PROCESS FOR COOLING A SCR DOZER FOR A CATALYTIC
EXHAUST OF AN AUTOMOTIVE VEHICLE
TECHNICAL FIELD
The present invention relates to an optimized process for cooling a SCR dozer for a catalytic exhaust of an automotive vehicle.
BACKGROUND OF THE INVENTION
It is known that a catalytic exhaust comprises a selective catalytic reduction (SCR) dozer or metering module that controls injection of urea to transform oxides of nitrogen, called NOx, into water vapor and harmless nitrogen. When the thermal engine of the vehicle is on, a mechanical pump driven by the thermal engine ensures the flowing of a coolant to cool the SCR dozer.
However, the mechanical pump cannot be activated when the engine is off, which would lead to an increase of the catalytic exhaust after shutting off of the vehicle In particular, an increase of the SCR dozer temperature could provoke damage of the dozer and urea sticking issue.
To remedy this problem, it is known to use an additional dedicated electrical water pump to cool the SCR dozer when the engine is off, which unfortunately implies additional pipes, electronics and diagnosis and increases the cost of the catalytic exhaust and its maintenance.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to resolve the above-mentioned problem in providing a process for cooling a selective catalytic reduction (SCR) dozer for a catalytic exhaust of an automotive vehicle catalytic exhaust of an automotive vehicle, said process comprising, after an engine shut off, at least a phase, called purging-filling cycle, comprising the steps of purging an aqueous urea solution out of the SCR dozer, and filling the SCR dozer with the aqueous urea solution.
Thanks to the claimed process, when the engine is off, the SCR dozer is cooled by the urea that is renewed and hence maintained fresh during the purging-filling cycle. Consequently, no additional pump is needed, which reduces the cost of the catalytic exhaust as well as its maintenance.
The process may comprise a plurality of sequences of a purging-filling cycle and a thermal exchange phase.
A number of sequences may be comprised between 10 and 50, preferably between IS and 30.
Each sequence of purging-filling cycle and thermal exchange phase may be activated when the dozer temperature is higher than a threshold.
The final purging step may be activated when the temperature reaches a second threshold, said second threshold being lower than the first threshold.
The thermal exchange phase may have a duration comprised between 20 seconds and 2 minutes, preferably 30 seconds.
The sequences of purging-filling cycle and thermal exchange phase may have a duration comprised between 5 minutes and 35 minutes.
During the purging step, a pump may be disposed in a tank of the aqueous urea solution generates a flow of the aqueous urea solution from the SCR dozer to the tank.
During the filling step, the pump may generate a flow of the aqueous urea solution from the tank to the SCR dozer.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention is now described by way of example with reference to the accompanying drawings in which: Figure 1 is a schematic view of a device for carrying out a process for cooling a catalytic exhaust of an automotive vehicle as per the present invention in a purging step of the process.
Figure 2 is a schematic view of the device of figure 1 in a filling step of the process.
Figure 3 is a chronogram of the process as per the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The present invention is about a process P for cooling a selective catalytic reduction (SCR) dozer for a catalytic exhaust of an automotive vehicle.
The process P is carried out by a device 10 illustrated in figures 1 and 2.
As shown in these figures, the device 10 comprises a tank 12 for storing an aqueous urea solution 14. The tank 12 is arranged to store between 15 litres to 20 litres of aqueous urea solution. The tank 12 is arranged in the vehicle such that the temperature of the stored aqueous urea solution 14 is of the same order as the ambient temperature, which should be around 30°C at the most.
The aqueous urea solution, sometimes sold under the brand "Adblue Tr, comprising a mixture of urea and demineralized water.
The device 1 also comprises a selective catalytic reduction (SCR) dozer 16 and a pipe 18 connected to both the tank 12 and the SCR dozer 16. The SCR dozer is also known as metering module. The quantity of aqueous urea solution disposed in the SCR dozer 16 and the pipe 18 is around 2-3 grams.
The device 1 further comprises a pump 20 arranged inside the tank 12 and configured to make the aqueous urea solution flows from the SCR dozer 16 to the tank 12 (figure 1) via the pipe 18 and from the tank 12 to the SCR dozer (figure 2) via the pipe 18.
The SCR dozer 16 is connected to a catalytic exhaust body 22 such that the aqueous urea solution makes it possible to transform oxides of nitrogen, called 20 NOx into water vapor and harmless nitrogen As can be seen from figures 1 and 2, a coolant 24 circulates in pipes to cool the catalytic exhaust 22. The flowing of the coolant 24 is generated by a mechanical pump (not illustrated) driven by the thermal engine of the vehicle The process P is now detailed.
The process P takes place when the thermal engine of the vehicle is shut off When the vehicle is off, the coolant 24 does not circulate since the mechanical pump is also stopped and the temperature of the catalytic exhaust increases. The process P ensures the cooling of the catalytic exhaust.
The process P comprises at least a first phase, called purging-filling cycle C, comprising the steps of -purging (PURG) the aqueous urea solution out of the SCR dozer, as illustrated in figures 1 and 3, and -filling (FR) the SCR dozer with the aqueous urea solution, as illustrated in figures 2 and 3.
During purging, the pump 20 generates the flowing of the aqueous urea solution 14 from the SCR dozer 16 to the tank 12 through the pipe 18.
The SCR dozer is open during the purging step to allow the aqueous urea solution removal.
The purging step is performed during a given time (as described later) in order to only pump the quantity of aqueous urea solution present in the pipe 18 and dozer 16.
The purging step ensures the removal of all the aqueous urea solution 14 inside the SCR dozer and whose temperature is hot because of the increasing temperature of the catalytic exhaust.
As soon as the hot aqueous urea solution 14 penetrates the tank 12, its temperature decreases to reach the ambient temperature almost instantaneously.
Once all the hot aqueous solution has been removed from the SCR dozer 16 and the pipe 18, the pump speed is inverted to refill the SCR dozer 16 and the pipe 18 with fresh aqueous urea solution 14 in the filling step F1L.
During filling, the pump 20 generates the flowing of the aqueous urea solution 14 from the tank 12 to the SCR dozer 16 through the pipe 18. The SCR dozer is open during the filling step to allow air bubbles to be removed.
The purging-filling cycle C advantageously lasts a few seconds, between 0.5 seconds to 5 seconds, preferably 1 second or 2 seconds.
Once the purging-filling cycle C is finished, another phase of the process P takes place. This subsequent phase is a thermal exchanges phase ThP, wherein the aqueous urea solution N disposed inside the SCR dozer 16 exchanges calories such that the catalytic exhaust temperature reduces drastically.
The ThP phase lasts a time between 20 seconds and 2 minutes, preferably 30 seconds, as will be detailed later.
As shown in figure 3, the process P comprises a plurality of sequences of purging-filling cycle C and thermal phase ThP. The process P stops when the temperature of the SCR dozer 16 is below a temperature threshold, preferably 100°C, which corresponds to a duration comprised between 5 minutes and 35 minutes, preferably 10 minutes or 30 minutes.
The final step of the process P is a purging step, such that no urea is left in the dozer.
As can be seen from figure 3, the process P is activated when the temperature of the dozer is higher than a threshold (of 140°C on figure 3) Then, thanks to the purging-filling cycle and the thermal exchange phase, the temperature decreases before increasing again until the threshold is reached again. When the lower threshold is reached, the purging-filling cycle is activated again, followed by another thermal exchange phase.
As can be seen from figure 3, after a given number of cycles, between 2 and 100, advantageously between 15 to 30, preferably around 20, the temperature of the dozer decreases until another lower threshold (of 110°C) is reached.
Then, the final purging is activated, the dozer being cooled sufficiently.
LIST OF REFERENCES
P cooling process purging-filling cycle PURG purging step FIL filling step ThP thermal phase device for carrying out the process P 12 tank 14 aqueous urea solution 16 selective catalytic reduction (SCR) dozer 18 pipe pump 22 catalytic exhaust body 24 coolant
Claims (6)
- CLAIMS: 1. A process for cooling a selective catalytic reduction (SCR) dozer (16) for a catalytic exhaust of an automotive vehicle, said process comprising, after an engine shut off, the following steps: a) at least a sequence of a phase, called purging-filling cycle (C) followed by a thermal exchange phase (ThP), and b) a final purging step, wherein the purging-filling cycle (C) comprises the steps of': -purging an aqueous urea solution (14) out of the SCR dozer, and -filling the SCR dozer (16) with the aqueous urea solution (14), wherein said thermal exchange phase (ThP) consists of letting the aqueous urea solution (14) inside the SCR dozer (16), and wherein the final purging step consists in purging the aqueous urea solution (14) out of the SCR dozer.
- 2 The process as per claim 1, comprising a plurality of sequences of a purging-filling cycle (C) and a thermal exchange phase (ThP).
- 3. The process as per anyone of the preceding claims, comprising a number of sequences comprised between 10 and 50, preferably between 15 and 30.
- 4. The process as per anyone of the preceding claims, wherein each sequence of purging-filling cycle (C) and thermal exchange phase (ThP) is activated when the dozer temperature is higher than a first threshold
- 5. The process as per claim 4, wherein the final purging step is activated when the temperature reaches a second threshold, said second threshold being lower than the first threshold.
- 6. The process as per anyone of the preceding claims, wherein, during a purging step (PURG), a pump (20) disposed in a tank (12) of the aqueous urea solution (14) generates a flow of the aqueous urea solution (14) from the SCR dozer (16) to the tank (12) 7 The process as per claim 6, wherein, during the filling step (FIL), the pump (20) generates a flow of the aqueous urea solution (14) from the tank (12) to the SCR dozer ( I 6).
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1915132.3A GB2592859B (en) | 2019-10-18 | 2019-10-18 | Process for cooling a SCR dozer for a catalytic exhaust of an automotive vehicle |
CN202080072014.8A CN114555920A (en) | 2019-10-18 | 2020-10-18 | Method for cooling an SCR metering device for a catalytic exhaust gas pipe of a motor vehicle |
PCT/EP2020/079299 WO2021074441A1 (en) | 2019-10-18 | 2020-10-18 | Process for cooling a scr dozer for a catalytic exhaust of an automotive vehicle |
EP20796519.5A EP4045777A1 (en) | 2019-10-18 | 2020-10-18 | Process for cooling a scr dozer for a catalytic exhaust of an automotive vehicle |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1915132.3A GB2592859B (en) | 2019-10-18 | 2019-10-18 | Process for cooling a SCR dozer for a catalytic exhaust of an automotive vehicle |
Publications (3)
Publication Number | Publication Date |
---|---|
GB201915132D0 GB201915132D0 (en) | 2019-12-04 |
GB2592859A true GB2592859A (en) | 2021-09-15 |
GB2592859B GB2592859B (en) | 2022-06-29 |
Family
ID=68728107
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1915132.3A Active GB2592859B (en) | 2019-10-18 | 2019-10-18 | Process for cooling a SCR dozer for a catalytic exhaust of an automotive vehicle |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP4045777A1 (en) |
CN (1) | CN114555920A (en) |
GB (1) | GB2592859B (en) |
WO (1) | WO2021074441A1 (en) |
Citations (3)
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US20110274590A1 (en) * | 2010-05-05 | 2011-11-10 | Floyd Ryan A | Inverted Exhaust Gas Treatment Injector |
US20150090808A1 (en) * | 2012-05-10 | 2015-04-02 | Tenneco Automotive Operating Company Inc. | Coaxial Flow Injector |
GB2521002A (en) * | 2013-12-09 | 2015-06-10 | Caterpillar Inc | Battery switch access system for machine |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102022163A (en) * | 2010-12-15 | 2011-04-20 | 中国第一汽车集团公司 | Urea pump-urea filter built-in urea system |
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Also Published As
Publication number | Publication date |
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WO2021074441A1 (en) | 2021-04-22 |
GB201915132D0 (en) | 2019-12-04 |
CN114555920A (en) | 2022-05-27 |
EP4045777A1 (en) | 2022-08-24 |
GB2592859B (en) | 2022-06-29 |
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