WO2013035112A1 - A device for dosing an aqueous solution in an exhaust gas path - Google Patents
A device for dosing an aqueous solution in an exhaust gas path Download PDFInfo
- Publication number
- WO2013035112A1 WO2013035112A1 PCT/IN2012/000595 IN2012000595W WO2013035112A1 WO 2013035112 A1 WO2013035112 A1 WO 2013035112A1 IN 2012000595 W IN2012000595 W IN 2012000595W WO 2013035112 A1 WO2013035112 A1 WO 2013035112A1
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- WO
- WIPO (PCT)
- Prior art keywords
- dosing
- exhaust gas
- flange
- gas path
- aqueous solution
- Prior art date
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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
- 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
- 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
- F01N13/08—Other arrangements or adaptations of exhaust conduits
-
- 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
- F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
- F01N2260/02—Exhaust treating devices having provisions not otherwise provided for for cooling the device
- F01N2260/022—Exhaust treating devices having provisions not otherwise provided for for cooling the device using air
-
- 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
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- 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
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
-
- 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
Definitions
- This invention relates to a device for dosing an aqueous solution in an exhaust gas path of a vehicle.
- Exhaust gas treatment devices and strategies are widely used in vehicle. These devices and strategies ensure that the exhaust gases are treated and harmful emissions coming out of a vehicle are kept as low as possible.
- exhaust gas treatment strategies which cater to different components of the exhaust gas that comes out of the vehicle.
- the two most popular exhaust gas treatment devices and strategies include (i) particulate matter removal and (ii) dosing an aqueous solution to treat oxides of nitrogen. With reference to this application we will be discussing the latter of the two strategies aforementioned.
- Oxides of nitrogen contribute to the green house effect and other types of contamination. Hence emission norm around the world require that the oxides of nitrogen be treated to convert them to elemental nitrogen before they are let out into the atmosphere.
- One of the most popular methods of treating the exhaust gases to convert the oxides of nitrogen to elemental is by using an aqueous solution.
- An aqueous solution dosing device is used downstream of the exhaust gas pipe.
- the dosing mechanism doses a metered quantity of the aqueous solution into the exhaust gas path.
- the metered quantity of the aqueous solution reacts with the oxides of nitrogen and converts it to elemental nitrogen.
- Figure 1 illustrates a dosing device is located in proximity of the downstream exhaust gas path which allows the metered quantity of aqueous solution to be dosed in the exhaust gas path.
- the dosing device comprises an injector which is the device responsible for dosing the metered quantity of aqueous solution in the exhaust gas path.
- the injector sprays the metered quantity of the aqueous solution.
- the effectiveness of the aqueous solution in converting the oxides of nitrogen to elemental nitrogen is dependent on a number of parameters such as mass flow rate of the exhaust gas, amount of aqueous solution dosed, angle at which the aqueous solution is sprayed downstream of the exhaust gas path, the tip temperature of the injector and the like.
- injector tip temperature and strategies to maintain tip temperature within a threshold value which ensures that the dosing strategies are properly implemented without damaging the injector.
- temperatures of the components which are in proximity of the injector tip contribute and influence injector tip temperature.
- another focus of this application is effective removal of heat from the components which are in proximity of the injector tip.
- the strategy to keep the injector tip temperature within a threshold limit varies depending on the type of vehicle the strategy employed is an air cooled system which is utilized to maintain the temperature of the components in proximity of the injector tip within a threshold limit.
- the strategy employed is an air cooled system which is utilized to maintain the temperature of the components in proximity of the injector tip within a threshold limit.
- such an air cooled strategy does not employ any direct strategy to reduce the tip temperature of the injector tip.
- parameters such as exhaust gas temperature and the mass rate of exhaust gas is lower in these types of vehicles.
- US Patent application 20100170233 discloses a device for dosing an aqueous solution in an exhaust gas path of a vehicle.
- a jacket is provided so the aqueous solution that is dosed in the exhaust gas path does not get deposited on the walls of the part which connects the dosing device to the exhaust gas path.
- it does not address the challenge related to reduction of the tip temperature of the aqueous solution dosing injector.
- Japanese patent publication JP2011080397 discloses a device for dosing an aqueous solution in an exhaust gas path of a vehicle.
- the fin type mechanism is provided in proximity of the dosing device to cool the aqueous solution.
- it does not the address the challenge related to reduction of tip temperature of the injector. Neither does it address the challenge related to the heat transfer from the components of the dosing device to the atmosphere.
- the device as claimed in the independent claims has the following advantages.
- the device ensures that the tip of the injector which injects the aqueous solution in the exhaust gas path has minimum contact with the high temperature exhaust gas. This has the advantage that the temperature to which the tip of the injector is exposed is lower that the temperature in conventional cases. Further the heat sink ensures that there is proper heat transfer from the components of the dosing device to the atmosphere. This reduces the thermal stress on the components of the dosing device. As the tip of the injector is exposed to a comparatively lower temperature which is within the threshold limit for the injector tip damage to the injector tip is avoided.
- the shape of the flange ensures that the aqueous solution is dosed in the direction of the exhaust gas path and does not get deposited on the walls of the flange.
- Figure 1 illustrates a dosing device is located in proximity of the downstream exhaust gas path
- Figure 2 illustrates a device for dosing an aqueous solution in an exhaust gas path in accordance with this invention.
- FIG. 2 illustrates a device 10 for dosing an aqueous solution in an exhaust gas path 12 in accordance with this invention.
- the dosing device 10 comprises a dosing module 24 having a dosing valve 22.
- Dosing module 24 is an assembly of valve holder 23, dosing valve 22, a cooling body 21, an insulator 19, a tip protector 18 and a heat sink 20.
- the flange 14 is located in the exhaust gas path 12 such that the aqueous solution can be dosed in the exhaust gas path 12.
- a heat sink 20 is located on the flange interface 16 thorough a means of mounting feature 16b.
- the insulator 19 avoids the direct contact between heat sink 20 and cooling body 21.
- the cooling body 21 is adapted to receive the dosing valve 22 which is used to dose the aqueous solution in the exhaust gas path 12.
- the flange interface 16 comprises a protection feature 16a and a mounting feature 16b.
- the shape of the flange 14 is such that it ensures that the aqueous solution which is to be dosed in the exhaust gas path 12 does not get deposited on the walls of the flange 14. While designing the Adblue dosing devices, care is also taken for the dosing angle in which the flange 14 is positioned in the exhaust pipe 11 with respect to exhaust gas path 12. The angle is maintained such that the aqueous solution, which is dosed from the dosing module 24, is mixed with the exhaust gas path 12 without depositing on the walls of the flange 14.
- the construction of the device 10 may be explained as follows.
- the flange 14 comprises three parts as flange neck 14a, the flange pipe 14b and the flange base 14c.
- the flange base 14c is the part of the flange 14 which is located on the exhaust gas path 12.
- the flange base 14c is welded onto the exhaust pipe 11 with respect to exhaust gas path 12.
- Flange interface 16 welded on top of flange neck 14a.
- the protection feature 16a and the mounting feature 16b is usually an integral part of the flange interface 16.
- the shape of the flange 14 is shown to be cylindrical.
- the shape of the flange 14 may be at least one chosen from a group of shapes including cylindrical with a circular cross section, cylindrical with a polygonal cross section, conical, hexagonal and the like.
- the flange interface 16 comprises the protection feature 16a and the mounting feature 16b.
- the contact between exhaust gas and tip of dosing valve 22 is minimized by means of protection feature 16a.
- the protection feature 16a also minimizes corrosion effect to the tip protector 18.
- the tip protector 18 is located between the heat sink 20 and the cooling body 21 without any locking feature.
- the tip of the dosing valve 22 should be located above the protection feature 16a in the flange interface 16, such that the temperature to which the tip of the dosing valve 22 is exposed to the prescribed temperature within limit.
- the method used to maintain the tip temperature of the dosing valve 22 within the prescribed limit is by locating the dosing valve 22 away from the exhaust gas path 12.
- the protection feature 16a holds the dosing module 24 by means of screw.
- the heat sink 20 which is mounted on the flange interface 16 additionally ensures that the tip of the dosing valve 22 is located at a distance from the exhaust gas path 12 in comparison with the conventional techniques. This ensures that the temperature to which the tip of the dosing valve 22 is exposed is lower than in conventional dosing devices used for the same purpose. This avoids damage to the tip of the dosing module 22.
- the heat sink 20 which is mounted on the flange interface 16 has plurality of fins.
- the fins ensure sufficient heat transfer from flange interface 16 to the atmosphere. This reduces the thermal stress on the cooling body 21 which is used to transfer the heat from other components of dosing module 24.
- This provides an air cooled strategy for cooling the components of the dosing device 10. This also ensures maximum direct heat transfer from the flange 14 to ambient through heat sink 20 with minimum heat transfer to the cooling body 21.
- This heat flow helps to keep the dosing valve 22 in prescribed temperature limit.
- the tip of dosing valve 22 experience higher temperature in absence of heat sink 20. Heat sink 20 placed in dosing device 10 to act as a heat promoter, so that it assists for additional heat transfer to ambient. This technique of maintaining the tip temperature of the dosing valve 22 lower than the a threshold limit is found to be more effective than other conventional techniques where heat flow resistance provided between flange interface 16 to dosing module 24.
- the dosing module was simulated in an environment identical to an environment existing in a commercial vehicle or a heavy duty vehicle.
- a typically used dosing valve 22 injector
- the flow rate of exhaust gas is 1360kg/hr and the temperature of the exhaust is within the range of 500 degree centigrade to 600 degree centigrade.
- the temperature to which the tip of the dosing module was measured to 130 degrees centigrade. With the tip of the dosing module being exposed to the temperature as aforementioned the dosing module failed after 5000 hours of working.
- the dosing device 10 in accordance with this invention was used in the same simulated set up and exposed to the same temperature conditions and the mass flow rate of exhaust the observations were as follows. Due to the arrangement of having a protection feature 16a in flange interface 16, flange 14 and the heat sink 22, the temperature to which the tip of the dosing module exposed to was recorded as 119 degrees centigrade. This is within the operating range of the dosing valve (injector). Based on the temperature exposure it is estimated that the dosing module/injector mounted on the device in accordance with this invention will work satisfactorily for 7000 hours of working.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
A device 10 for dosing an aqueous solution in an exhaust gas path 12 is disclosed. The device 10 comprises a dosing module 24 having a dosing valve 22. The device 10 is characterized by a flange 14 located in the exhaust gas path 12. A flange interface 16 comprising a protection feature 16a and a mounting feature 16b located at the end of the flange 14 distant from the exhaust gas path 12 and a heat sink 20 located on the flange interface 16 adapted to receive a dosing valve 22.
Description
Title: A DEVICE FOR DOSING AN AQUEOUS SOLUTION IN AN EXHAUST GAS PATH FIELD OF THE INVENTION
This invention relates to a device for dosing an aqueous solution in an exhaust gas path of a vehicle.
BACKGROUND OF THE INVENTION
Exhaust gas treatment devices and strategies are widely used in vehicle. These devices and strategies ensure that the exhaust gases are treated and harmful emissions coming out of a vehicle are kept as low as possible. There are a wide variety of exhaust gas treatment strategies which cater to different components of the exhaust gas that comes out of the vehicle. The two most popular exhaust gas treatment devices and strategies include (i) particulate matter removal and (ii) dosing an aqueous solution to treat oxides of nitrogen. With reference to this application we will be discussing the latter of the two strategies aforementioned.
One of the many components of the exhaust gas is different oxides of nitrogen. Oxides of nitrogen contribute to the green house effect and other types of contamination. Hence emission norm around the world require that the oxides of nitrogen be treated to convert them to elemental nitrogen before they are let out into the atmosphere. One of the most popular methods of treating the exhaust gases to convert the oxides of nitrogen to elemental is by using an aqueous solution.
An aqueous solution dosing device is used downstream of the exhaust gas pipe. The dosing mechanism doses a metered quantity of the aqueous solution into the exhaust gas path. The metered quantity of the aqueous solution reacts with the oxides of nitrogen and converts it to elemental nitrogen. Figure 1 illustrates a dosing device is located in proximity
of the downstream exhaust gas path which allows the metered quantity of aqueous solution to be dosed in the exhaust gas path.
The dosing device comprises an injector which is the device responsible for dosing the metered quantity of aqueous solution in the exhaust gas path. The injector sprays the metered quantity of the aqueous solution. The effectiveness of the aqueous solution in converting the oxides of nitrogen to elemental nitrogen is dependent on a number of parameters such as mass flow rate of the exhaust gas, amount of aqueous solution dosed, angle at which the aqueous solution is sprayed downstream of the exhaust gas path, the tip temperature of the injector and the like. For the purposes of this patent application we will focus on injector tip temperature and strategies to maintain tip temperature within a threshold value which ensures that the dosing strategies are properly implemented without damaging the injector.
Further, temperatures of the components which are in proximity of the injector tip contribute and influence injector tip temperature. Hence another focus of this application is effective removal of heat from the components which are in proximity of the injector tip.
Further, depending on the type of vehicle the strategy to keep the injector tip temperature within a threshold limit varies. For passenger vehicle and light duty vehicles the strategy employed is an air cooled system which is utilized to maintain the temperature of the components in proximity of the injector tip within a threshold limit. However, such an air cooled strategy does not employ any direct strategy to reduce the tip temperature of the injector tip. One reason this is not done is that parameters such as exhaust gas temperature and the mass rate of exhaust gas is lower in these types of vehicles.
However, for heavy duty vehicles and commercial vehicles the strategy of providing an air cooled mechanism for the aqueous solution dosing device is ineffective. Due the mass rate flow to the exhaust gas and the temperature of the exhaust gas the conventional technique of providing an air cooled mechanism does not provide the required heat transfer. One of major challenges in employing a conventionally known air cooled strategy is that the heat transfer to the atmosphere is not sufficient. Due to the high temperature there is a
possibility of damage to the injector. The injector tip is exposed to the high temperature which may also lead to the injector tip being damaged thus reducing the overall efficiency of the device for dosing an aqueous solution. For this reason a popularly used cooling strategy is the use of water cooled mechanism in case of heavy duty and commercial vehicles.
US Patent application 20100170233 discloses a device for dosing an aqueous solution in an exhaust gas path of a vehicle. In the device a jacket is provided so the aqueous solution that is dosed in the exhaust gas path does not get deposited on the walls of the part which connects the dosing device to the exhaust gas path. However, it does not address the challenge related to reduction of the tip temperature of the aqueous solution dosing injector.
Japanese patent publication JP2011080397 discloses a device for dosing an aqueous solution in an exhaust gas path of a vehicle. In the device the fin type mechanism is provided in proximity of the dosing device to cool the aqueous solution. However, it does not the address the challenge related to reduction of tip temperature of the injector. Neither does it address the challenge related to the heat transfer from the components of the dosing device to the atmosphere.
It is an object of this invention to provide an air cooled mechanism for the aqueous solution dosing device of a commercial and a heavy duty vehicle which keeps the tip temperature of the injector within the required temperature range and also ensuring proper heat transfer from the components of the dosing device to the atmosphere.
ADVANTAGES OF THE INVENTION
The device as claimed in the independent claims has the following advantages. The device ensures that the tip of the injector which injects the aqueous solution in the exhaust gas path has minimum contact with the high temperature exhaust gas. This has the advantage that the temperature to which the tip of the injector is exposed is lower that the temperature in conventional cases. Further the heat sink ensures that there is proper heat transfer from the components of the dosing device to the atmosphere. This reduces the
thermal stress on the components of the dosing device. As the tip of the injector is exposed to a comparatively lower temperature which is within the threshold limit for the injector tip damage to the injector tip is avoided.
The shape of the flange ensures that the aqueous solution is dosed in the direction of the exhaust gas path and does not get deposited on the walls of the flange.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Different modes of the invention are disclosed in detail in the description and illustrated in the accompanying drawing:
Figure 1 illustrates a dosing device is located in proximity of the downstream exhaust gas path; and
Figure 2 illustrates a device for dosing an aqueous solution in an exhaust gas path in accordance with this invention.
DETAILED DESCRIPTION OF THE INVENTION
Figure 2 illustrates a device 10 for dosing an aqueous solution in an exhaust gas path 12 in accordance with this invention. The dosing device 10 comprises a dosing module 24 having a dosing valve 22. Dosing module 24 is an assembly of valve holder 23, dosing valve 22, a cooling body 21, an insulator 19, a tip protector 18 and a heat sink 20. The flange 14 is located in the exhaust gas path 12 such that the aqueous solution can be dosed in the exhaust gas path 12. A heat sink 20 is located on the flange interface 16 thorough a means of mounting feature 16b. The insulator 19 avoids the direct contact between heat sink 20 and cooling body 21. The cooling body 21 is adapted to receive the dosing valve 22 which is used to dose the aqueous solution in the exhaust gas path 12. The flange interface 16 comprises a protection feature 16a and a mounting feature 16b.
The shape of the flange 14 is such that it ensures that the aqueous solution which is to be dosed in the exhaust gas path 12 does not get deposited on the walls of the flange 14. While designing the Adblue dosing devices, care is also taken for the dosing angle in which the
flange 14 is positioned in the exhaust pipe 11 with respect to exhaust gas path 12. The angle is maintained such that the aqueous solution, which is dosed from the dosing module 24, is mixed with the exhaust gas path 12 without depositing on the walls of the flange 14.
The construction of the device 10 may be explained as follows. The flange 14 comprises three parts as flange neck 14a, the flange pipe 14b and the flange base 14c. The flange base 14c is the part of the flange 14 which is located on the exhaust gas path 12. The flange base 14c is welded onto the exhaust pipe 11 with respect to exhaust gas path 12. Flange interface 16 welded on top of flange neck 14a. The protection feature 16a and the mounting feature 16b is usually an integral part of the flange interface 16. In the embodiment described in accordance with figure 2, the shape of the flange 14 is shown to be cylindrical. However, the shape of the flange 14 may be at least one chosen from a group of shapes including cylindrical with a circular cross section, cylindrical with a polygonal cross section, conical, hexagonal and the like.
As mentioned before the flange interface 16 comprises the protection feature 16a and the mounting feature 16b. The contact between exhaust gas and tip of dosing valve 22 is minimized by means of protection feature 16a. The protection feature 16a also minimizes corrosion effect to the tip protector 18. The tip protector 18 is located between the heat sink 20 and the cooling body 21 without any locking feature.
An important aspect of the invention is that the tip of the dosing valve 22 should be located above the protection feature 16a in the flange interface 16, such that the temperature to which the tip of the dosing valve 22 is exposed to the prescribed temperature within limit. In accordance with this invention the method used to maintain the tip temperature of the dosing valve 22 within the prescribed limit is by locating the dosing valve 22 away from the exhaust gas path 12. However, care is taken that the location of the dosing valve 22 does not change the manner or the amount of the aqueous solution required for dosing, also ensures proper mixing pattern of aqueous solution with exhaust gas. The protection feature 16a holds the dosing module 24 by means of screw. Further the heat sink 20 which is mounted on the flange interface 16 additionally ensures that the tip of the dosing valve 22 is located at a distance from the exhaust gas path 12 in comparison with the conventional
techniques. This ensures that the temperature to which the tip of the dosing valve 22 is exposed is lower than in conventional dosing devices used for the same purpose. This avoids damage to the tip of the dosing module 22.
Further the heat sink 20 which is mounted on the flange interface 16 has plurality of fins. The fins ensure sufficient heat transfer from flange interface 16 to the atmosphere. This reduces the thermal stress on the cooling body 21 which is used to transfer the heat from other components of dosing module 24. This provides an air cooled strategy for cooling the components of the dosing device 10. This also ensures maximum direct heat transfer from the flange 14 to ambient through heat sink 20 with minimum heat transfer to the cooling body 21. This heat flow helps to keep the dosing valve 22 in prescribed temperature limit. Also the tip of dosing valve 22 experience higher temperature in absence of heat sink 20. Heat sink 20 placed in dosing device 10 to act as a heat promoter, so that it assists for additional heat transfer to ambient. This technique of maintaining the tip temperature of the dosing valve 22 lower than the a threshold limit is found to be more effective than other conventional techniques where heat flow resistance provided between flange interface 16 to dosing module 24.
One working example of the device is claimed in the independent claims can be explained as follows. In a test set for the device 10 the dosing module was simulated in an environment identical to an environment existing in a commercial vehicle or a heavy duty vehicle. A typically used dosing valve 22 (injector) is able to with stand temperature below 120 degree centigrade. Typically, in such an environment simulating a commercial vehicle or a heavy duty vehicle the flow rate of exhaust gas is 1360kg/hr and the temperature of the exhaust is within the range of 500 degree centigrade to 600 degree centigrade. With a conventional air cooled strategy the observations were as follows. The temperature to which the tip of the dosing module was measured to 130 degrees centigrade. With the tip of the dosing module being exposed to the temperature as aforementioned the dosing module failed after 5000 hours of working.
When the dosing device 10 in accordance with this invention was used in the same simulated set up and exposed to the same temperature conditions and the mass flow rate
of exhaust the observations were as follows. Due to the arrangement of having a protection feature 16a in flange interface 16, flange 14 and the heat sink 22, the temperature to which the tip of the dosing module exposed to was recorded as 119 degrees centigrade. This is within the operating range of the dosing valve (injector). Based on the temperature exposure it is estimated that the dosing module/injector mounted on the device in accordance with this invention will work satisfactorily for 7000 hours of working.
It must be understood that the embodiments and examples provided in the description are only illustrative and do not limit the scope of the invention. The scope is only limited by the claims. Thus many modification and embodiments are envisaged to be within the scope of this invention.
Claims
1. A device (10) for dosing an aqueous solution in an exhaust gas path (12), said device (10) comprising a dosing module (24) having a dosing valve (22), characterized in that
(i) a flange (14) is located in said exhaust gas path (12);
(ii) a flange interface (16) comprising a protection feature (16a) and mounting feature (16b) located at the end of said flange (14) distant from the exhaust gas path (12); and
(iii) a heat sink (20) located on said flange interface (16), adapted to receive a dosing valve (22).
2. The device (10) as claimed in claim 1, wherein said dosing valve (22) is a dosing injector.
3. The device (10) as claimed in claim 1, wherein said flange (14) comprises at least a flange neck (14a), flange pipe (14b) and flange base (14c).
4. The device (10) as claimed in claim 1 & 3, wherein said flange base (14c) is fitted in said exhaust gas path (12) allowing an aqueous solution to be dosed in said exhaust gas path (12).
5. The device (10) as claimed in claim 1 & 3, wherein said protection feature and said mounting feature (16b) is located in said flange neck (14a).
6. The device (10) as claimed in claim 3, wherein said flange (14) is of a shape chosen from a group including cylindrical with circular cross section, cylindrical with a polygonal cross- section and the like.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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IN3087CH2011 | 2011-09-08 | ||
IN3087/CHE/2011 | 2011-09-08 |
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WO2013035112A1 true WO2013035112A1 (en) | 2013-03-14 |
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PCT/IN2012/000595 WO2013035112A1 (en) | 2011-09-08 | 2012-09-07 | A device for dosing an aqueous solution in an exhaust gas path |
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US20140369899A1 (en) * | 2014-09-01 | 2014-12-18 | Caterpillar Inc. | Multi-compartment phae separation tank for multiple reductant injectors |
US20150198075A1 (en) * | 2014-01-14 | 2015-07-16 | Caterpillar Inc. | Injector Cooling Apparatus |
US9664081B2 (en) | 2007-07-24 | 2017-05-30 | Faurecia Emissions Control Technologies, Germany Gmbh | Assembly and method for introducing a reducing agent into the exhaust pipe of an exhaust system of an internal combustion engine |
US9714598B2 (en) | 2015-04-30 | 2017-07-25 | Faurecia Emissions Control Technologies, Usa, Llc | Mixer with integrated doser cone |
US9719397B2 (en) | 2015-04-30 | 2017-08-01 | Faurecia Emissions Control Technologies Usa, Llc | Mixer with integrated doser cone |
US9726064B2 (en) | 2015-04-30 | 2017-08-08 | Faurecia Emissions Control Technologies, Usa, Llc | Mixer for use in a vehicle exhaust system |
US9828897B2 (en) | 2015-04-30 | 2017-11-28 | Faurecia Emissions Control Technologies Usa, Llc | Mixer for a vehicle exhaust system |
US10227907B2 (en) | 2014-06-03 | 2019-03-12 | Faurecia Emissions Control Technologies, Usa, Llc | Mixer and doser cone assembly |
US10787946B2 (en) | 2018-09-19 | 2020-09-29 | Faurecia Emissions Control Technologies, Usa, Llc | Heated dosing mixer |
US10933387B2 (en) | 2016-10-21 | 2021-03-02 | Faurecia Emissions Control Technologies, Usa, Llc | Reducing agent mixer |
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US9664081B2 (en) | 2007-07-24 | 2017-05-30 | Faurecia Emissions Control Technologies, Germany Gmbh | Assembly and method for introducing a reducing agent into the exhaust pipe of an exhaust system of an internal combustion engine |
US20150198075A1 (en) * | 2014-01-14 | 2015-07-16 | Caterpillar Inc. | Injector Cooling Apparatus |
US9267410B2 (en) | 2014-01-14 | 2016-02-23 | Caterpillar Inc. | Injector cooling apparatus |
US10227907B2 (en) | 2014-06-03 | 2019-03-12 | Faurecia Emissions Control Technologies, Usa, Llc | Mixer and doser cone assembly |
US10294843B2 (en) | 2014-06-03 | 2019-05-21 | Faurecia Emissions Control Technologies, Usa, Llc | Mixer and doser cone assembly |
US20140369899A1 (en) * | 2014-09-01 | 2014-12-18 | Caterpillar Inc. | Multi-compartment phae separation tank for multiple reductant injectors |
US9714598B2 (en) | 2015-04-30 | 2017-07-25 | Faurecia Emissions Control Technologies, Usa, Llc | Mixer with integrated doser cone |
US9719397B2 (en) | 2015-04-30 | 2017-08-01 | Faurecia Emissions Control Technologies Usa, Llc | Mixer with integrated doser cone |
US9726064B2 (en) | 2015-04-30 | 2017-08-08 | Faurecia Emissions Control Technologies, Usa, Llc | Mixer for use in a vehicle exhaust system |
US9828897B2 (en) | 2015-04-30 | 2017-11-28 | Faurecia Emissions Control Technologies Usa, Llc | Mixer for a vehicle exhaust system |
US10933387B2 (en) | 2016-10-21 | 2021-03-02 | Faurecia Emissions Control Technologies, Usa, Llc | Reducing agent mixer |
US10787946B2 (en) | 2018-09-19 | 2020-09-29 | Faurecia Emissions Control Technologies, Usa, Llc | Heated dosing mixer |
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