WO2018117929A1 - Arrangement for heating reducing agent line as well as coupling part and vehicle comprising the arrangement - Google Patents

Arrangement for heating reducing agent line as well as coupling part and vehicle comprising the arrangement Download PDF

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Publication number
WO2018117929A1
WO2018117929A1 PCT/SE2017/051177 SE2017051177W WO2018117929A1 WO 2018117929 A1 WO2018117929 A1 WO 2018117929A1 SE 2017051177 W SE2017051177 W SE 2017051177W WO 2018117929 A1 WO2018117929 A1 WO 2018117929A1
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WO
WIPO (PCT)
Prior art keywords
line
connection member
arrangement
delivery line
exhaust gas
Prior art date
Application number
PCT/SE2017/051177
Other languages
French (fr)
Inventor
Joakim GAUFFIN
Anna PETRÉN
Original Assignee
Scania Cv Ab
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Scania Cv Ab filed Critical Scania Cv Ab
Publication of WO2018117929A1 publication Critical patent/WO2018117929A1/en

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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]
    • 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
    • B01D53/9431—Processes characterised by a specific device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J4/00—Feed or outlet devices; Feed or outlet control devices
    • B01J4/02—Feed or outlet devices; Feed or outlet control devices for feeding measured, i.e. prescribed quantities of reagents
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/206—Ammonium compounds
    • B01D2251/2067—Urea
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/01—Engine exhaust gases
    • B01D2258/012—Diesel engines and lean burn gasoline engines
    • 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
    • F01N2610/03—Adding substances to exhaust gases the substance being hydrocarbons, e.g. engine fuel
    • 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
    • F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
    • 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
    • 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
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • F01N2610/146—Control thereof, e.g. control of injectors or injection valves
    • 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
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • 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

  • the present invention relates an arrangement for providi ng a reducing agent to an exhaust gas treatment device of an exhaust gas system comprising a tank contain ing said agent,
  • connection member arranged i n the extension of the del ivery li ne to connect a component to delivery line portions upstreams and downstreams thereof .
  • Such an arrangement is especially but not necessari ly used in exhaust gas systems for internal combustion eng ines, which may then for example be arranged in a motor vehicle for propulsion thereof or i n an industrial application .
  • the invention is particularly applicable to such arrangements for exhaust gas systems i n motor vehicles making it suitable to hereinafter discussing the invention for that appl ication without i n any way restrict it thereto.
  • a catalyst i n the exhaust line in order to effect catalytic conversion of envi ron mentally harmfu l components of exhaust gases to envi ronmental ly less harmful substances.
  • One type of catalyst wh ich has been developed and brought i nto use is based on so called SCR (Selective Catalytic Reduction) technol- ogy.
  • a reducing agent preferably ammonia, is then used for reduction of nitrogen oxide components (NO x ) in the exhaust gas.
  • Selective catalytic reduction is used especially i n lean burn internal combustion engines, i .e. diesel engines.
  • Ammon ia is a toxic and malodorous substance and it is therefore not appropriate to store ammon ia in a vehicle, so that it is stored in the form of a precu rsor, of which an example is urea or especially an aqueous urea solution .
  • "Reducing agent" as mentioned in th is disclosu re and especially the appended claims is to be interpreted to also cover solutions containing a reduci ng agent.
  • the problem of storing a solution of that type is that it freezes at a temperature of less than - 1 1 °C. Such low temperatu res can occur especially when the motor vehicle is stationary for long periods.
  • the arrangement has to be capable of quickly thawing out at least a starti ng volu me of the reducing agent so that operation of the exhaust gas treatment device is possible i mmediately, even if there is sti ll frozen reducing agent i n the arrangement.
  • the medium flow conducting line is preferably, but not necessarily, a hose carryi ng cooli ng liquid used to cool the internal combustion engine produci ng the exhaust gases to be treated.
  • J P 2009243279 A discloses an arrangement of the type defined in the i ntroduction havi ng a pipe keeping a said medi um flow conducting l ine close to a reduci ng agent delivery line between two said connection members, but any solution to the problems men- tioned above is not provided.
  • the object of the present i nvention is to provide an arrangement of the type defi ned i n the introduction being improved in at least some aspect with respect to such arrangements al ready known .
  • connection member By providing the arrangement with a casing surrounding the connection member and containi ng means config ured to transfer heat from the maxim m flow conducting line to the connection member such heat transfer may be carried out with the efficiency required without any need of a separate device for providing heat energy.
  • the casing will help to keep heat radiating from the medium flow conducting line i nside the casing to flow into and heat the walls of the connection member and by that the reducing agent contained therein instead of escaping and be lost to the environment.
  • the casing wi ll then also assist to keep a part of the medi um flow conducti ng line when such a part is contained in the casing at a proper position with respect to the connection member, which normally means very close thereto, or any other type of said means in a proper position for obtaini ng the heat transfer asked for.
  • said means comprises a part of the maxim m flow conducting line arranged inside the casing .
  • the casing wi ll then provide for enclosing heat energy radiating from said part and direct it to the con nection member.
  • said part of the medium flow conducting line extends closely to and along the connection member from a delivery line entrance to a delivery line exit of the casing .
  • Such an extension of the medium flow conducting line facil itated by the presence of the casi ng results in a possibi lity to efficiently transfer heat from the medium flowing i n the medium flow conducting l ine through the con nection member to the reducing agent therein .
  • the casing as in another embodiment of the i nvention , is designed to keep said part of the medium flow conducti ng l ine to bear on the connection member.
  • said means comprises a metal member having su rfaces i n contact with the ex- terior of the maxim m flow conducti ng line and su rfaces in contact with the exterior of the connection member for heat transfer from said medium to the connection member.
  • the arrangement comprises a plural ity of said connection members arranged in the extension of the delivery line, and each connection member is provided with a said casing and said means for heat transfer thereto.
  • each connection member is provided with a said casing and said means for heat transfer thereto.
  • said medi um flow conducting line is part of a loop conducting maxim m for cooling a member arranged i n connection with the arrangement, such as an internal combustion engine producing exhaust gases to be treated by said device.
  • the medium flow conducting line may con- duct any medium suitable for transfer of heat to the reducing agent in the del ivery line and the at least one con nection member, such as gas or a liqu id, but i n the case of being used for cooling an internal combustion engi ne it is preferably a cooli ng l iquid, such as cooli ng water.
  • the i nvention also relates to a motor vehicle according to the appended i ndependent claim di rected to a motor vehicle and wh ich is provided with an arrangement according to the present invention for providing an exhaust gas treatment device of the motor veh icle with a reduci ng agent.
  • Fig.2 is a partially sectioned view of relevant parts of an arrangement according to a first embodiment of the in- vention.
  • Fig.3 is a view similar to that of Fig.2 of an arrangement according to a second embodiment of the invention. DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION
  • Fig. 1 shows very schematically a combustion engine 1 of a motor vehicle 2 provided with an arrangement for providing a reducing agent to an exhaust gas treatment device of an exhaust gas system of the combustion engine of the type to which the present invention pertains. It is pointed out that this diagram is heavily simplified and does only show members and equipment necessary for explaining the present invention.
  • Exhaust gases leaving the com- bustion engine 1 pass through an exhaust line 3 and reach the environment via an exhaust outlet 4.
  • An SCR catalyst 5 is arranged in the exhaust line 3. Exhaust gases from the combustion engine 1 are thus caused to pass through this catalyst 4 before they reach the environment via the exhaust outlet 3.
  • An arrangement for providing a reducing agent to an exhaust gas treatment device in the form of a catalyst 5 comprises a tank 6 containing the agent, preferably in the form of a precursor, such as urea, for example obtainable under the trademark AdBlue®.
  • a delivery line 7 connects the tank 6 to the catalyst 5 by an injection unit 8 arranged to inject reducing agent into the exhaust line 3 upstreams the SCR catalyst 5.
  • a pump 9 is configured to transport the agent from the tank 6 through the delivery line to the injection unit 8.
  • Connection members 10, 11 are arranged along the delivery line to connect different components to deliver line portions upstreams and downstreams of such connection members. Such a component may for instance be the pump 9 and the injection unit 8.
  • a cooling liquid system 12 for cooling the internal combustion engine 1 is simplifiedly illustrated. This cooling liquid system has a pump 13 pumping a cooling liquid, such as cooling water, in a medium flow conducting line 14 in a loop passing the combustion engine where the water is heated and then along the delivery line 7 for transferring heat to the reducing agent contained therein.
  • Fig. 2 illustrates the appearance of an arrangement according to a first embodiment of the invention in the region of a connection member 10 for connecting a delivery line portion 7' to a component such as a pump. It is shown how a medium flow conducting line 14 follows the delivery line closely for transfer heat from the medium in the line 14 to the reducing agent inside the line 7'.
  • a casing 15 surrounds the connection member 10 and allows the medium flow conducting line 14 to pass from an entrance 16 to an exit 17 of the casing while being kept by the casing to follow the connection member closely or bearing thereon.
  • a suitable material, mainly for the mechanical properties thereof, for the casing 15 is PA (polyamide), such as polyamide 6.
  • PA polyamide
  • the shape of the casing may be adapted to the connection member and space available.
  • the casing may have a first part making an angle to a second part which may be threaded onto the connection member 10.
  • the casing may bear tightly onto the lines (hoses) 7', 14 or be slightly spaced with respect thereto but then possibly bear onto the lines 7', 14 and the line 14 at the respective end of the casing for improving thermal isolation of the interior of the casing.
  • Fig. 3 illustrates an embodiment in which the part 18' of the medium flow conducting line arranged inside the casing 15' is shorter than in the embodiment shown in Fig.2 and exits the casing in a mid-section thereof.
  • a metal member 19 is instead arranged in the casing with surfaces 20 in contact with the exterior of the medium flow conducting line and surfaces 21 in contact with the exterior of the connection member 10 for heat transfer from the medium to the connection member mainly through this metal member.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Health & Medical Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Toxicology (AREA)
  • General Engineering & Computer Science (AREA)
  • Organic Chemistry (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

An arrangement for providing a reducing agent to an exhaust gas treatment device or an exhaust gas system comprises a tank containing the agent, a delivery line (7') configured to connect the tank to said device for conducting the agent thereto, a pump for transport of the agent through the delivery line, a medium flow conducting line (14) following the delivery line closely over at least portions of the extension of the delivery line so as to transfer heat from the medium to the agent, and a connection member (10) for connecting a component to delivery line portions upstreams and downstreams thereof. A casing (15) surrounds the connection member (10) and contains means (18) for transfer of heat from the medium flow conducting line (14) to the connection member (10).

Description

ARRANGEMENT FOR HEATING REDUCING AGENT LINE AS WELL AS
COUPLING PART AND VEHICLE COMPRISING THE ARRANGEMENT
TECHN ICAL FI ELD OF TH E INVENTION The present invention relates an arrangement for providi ng a reducing agent to an exhaust gas treatment device of an exhaust gas system comprising a tank contain ing said agent,
• a delivery l ine config ured to connect the tank to a said exhaust gas treatment device for conducting said agent thereto,
• a pu mp configu red to transport said agent through said delivery li ne,
• a medi um flow conducti ng line following the del ivery line closely over at least portions of the extension of the de- livery line so as to transfer heat from said mediu m to the agent, and
• at least one connection member arranged i n the extension of the del ivery li ne to connect a component to delivery line portions upstreams and downstreams thereof .
Such an arrangement is especially but not necessari ly used in exhaust gas systems for internal combustion eng ines, which may then for example be arranged in a motor vehicle for propulsion thereof or i n an industrial application . The invention is particularly applicable to such arrangements for exhaust gas systems i n motor vehicles making it suitable to hereinafter discussing the invention for that appl ication without i n any way restrict it thereto.
To meet exhaust cleaning requirements, today's motor vehicles are usually provided with a catalyst i n the exhaust line in order to effect catalytic conversion of envi ron mentally harmfu l components of exhaust gases to envi ronmental ly less harmful substances. One type of catalyst wh ich has been developed and brought i nto use is based on so called SCR (Selective Catalytic Reduction) technol- ogy. A reducing agent, preferably ammonia, is then used for reduction of nitrogen oxide components (NOx) in the exhaust gas. Selective catalytic reduction is used especially i n lean burn internal combustion engines, i .e. diesel engines. Ammon ia is a toxic and malodorous substance and it is therefore not appropriate to store ammon ia in a vehicle, so that it is stored in the form of a precu rsor, of which an example is urea or especially an aqueous urea solution . "Reducing agent" as mentioned in th is disclosu re and especially the appended claims is to be interpreted to also cover solutions containing a reduci ng agent.
The problem of storing a solution of that type is that it freezes at a temperature of less than - 1 1 °C. Such low temperatu res can occur especially when the motor vehicle is stationary for long periods. When constructing an arrangement for providing a reduci ng agent to an exhaust gas treatment device of an exhaust gas system for that application this fact has to be considered, si nce the arrangement has to be capable of quickly thawing out at least a starti ng volu me of the reducing agent so that operation of the exhaust gas treatment device is possible i mmediately, even if there is sti ll frozen reducing agent i n the arrangement. This is the reason for providi ng an arrangement of the type defined in the i ntroduction with a mediu m flow conducting line followi ng the delivery li ne closely over at least portions of the extension of the delivery line so as to transfer heat from said medi um to the agent. The medium flow conducting line is preferably, but not necessarily, a hose carryi ng cooli ng liquid used to cool the internal combustion engine produci ng the exhaust gases to be treated. Althoug h , such heat transfer not using any separate heating device for thawing the reducing agent or reducing agent sol ution is si mple, reliable and advantageous from cost poi nt of view there is an inherent risk that it wil l not be able to thaw frozen reducing agent in con nection members used to connect components, such as a pu mp, in the delivery l ine as quickly as needed to comply with law requirements. One reason for th is is that such connecting members have usually substantially thicker walls or in any case walls and designs increasi ng the time to feed a certain amount of heat energy to reducing agent inside thereof with respect to a reducing agent inside a delivery line portion in the form of a hose. For complying with law requirements separate heating devices have then to be arranged for heating the connection members.
BACKG ROUN D ART
J P 2009243279 A discloses an arrangement of the type defined in the i ntroduction havi ng a pipe keeping a said medi um flow conducting l ine close to a reduci ng agent delivery line between two said connection members, but any solution to the problems men- tioned above is not provided. SU MMARY OF TH E I NVENTION
The object of the present i nvention is to provide an arrangement of the type defi ned i n the introduction being improved in at least some aspect with respect to such arrangements al ready known .
This object is according to the invention obtained by providing such an arrangement with the features listed i n the characterizing part of appended patent claim 1 .
By providing the arrangement with a casing surrounding the connection member and containi ng means config ured to transfer heat from the mediu m flow conducting line to the connection member such heat transfer may be carried out with the efficiency required without any need of a separate device for providing heat energy. The casing will help to keep heat radiating from the medium flow conducting line i nside the casing to flow into and heat the walls of the connection member and by that the reducing agent contained therein instead of escaping and be lost to the environment. The casing wi ll then also assist to keep a part of the medi um flow conducti ng line when such a part is contained in the casing at a proper position with respect to the connection member, which normally means very close thereto, or any other type of said means in a proper position for obtaini ng the heat transfer asked for.
According to an embodi ment of the invention said means comprises a part of the mediu m flow conducting line arranged inside the casing . The casing wi ll then provide for enclosing heat energy radiating from said part and direct it to the con nection member. Accordi ng to another embodiment of the invention said part of the medium flow conducting line extends closely to and along the connection member from a delivery line entrance to a delivery line exit of the casing . Such an extension of the medium flow conducting line facil itated by the presence of the casi ng results in a possibi lity to efficiently transfer heat from the medium flowing i n the medium flow conducting l ine through the con nection member to the reducing agent therein . This is especially the case if the casing , as in another embodiment of the i nvention , is designed to keep said part of the medium flow conducti ng l ine to bear on the connection member.
According to another embodiment of the invention said means comprises a metal member having su rfaces i n contact with the ex- terior of the mediu m flow conducti ng line and su rfaces in contact with the exterior of the connection member for heat transfer from said medium to the connection member. A combination of such a metal member and the arrangement of a casi ng su rrounding the connection member results in a heat transfer being considerably improved with respect to the case of only havi ng such a metal member as in the known arrangement mentioned above.
According to another embodiment of the invention the arrangement comprises a plural ity of said connection members arranged in the extension of the delivery line, and each connection member is provided with a said casing and said means for heat transfer thereto. In case of a plu ral ity of connection members in the extension of the del ivery line these may have different designs and different locations resu lting in different needs and different difficulties to transfer heat thereto, but it may then nevertheless be advantageous to provide each such con nection member with said casi ng and said means. Accordi ng to another embodiment of the invention said medi um flow conducting line is part of a loop conducting mediu m for cooling a member arranged i n connection with the arrangement, such as an internal combustion engine producing exhaust gases to be treated by said device. The medium flow conducting line may con- duct any medium suitable for transfer of heat to the reducing agent in the del ivery line and the at least one con nection member, such as gas or a liqu id, but i n the case of being used for cooling an internal combustion engi ne it is preferably a cooli ng l iquid, such as cooli ng water.
The i nvention also relates to a motor vehicle according to the appended i ndependent claim di rected to a motor vehicle and wh ich is provided with an arrangement according to the present invention for providing an exhaust gas treatment device of the motor veh icle with a reduci ng agent.
Further advantages as well as advantageous features of the invention wi ll appear from the description followi ng below. BRI EF DESCRI PTION OF TH E DRAWINGS
With reference to the appended drawi ngs, below follows a specific description of embodiments of the i nvention cited as examples. In the drawings: is a schematic diagram showing the general construction of a combustion engine with exhaust gas system and an arrangement for providing a reducing agent thereto,
Fig.2 is a partially sectioned view of relevant parts of an arrangement according to a first embodiment of the in- vention, and
Fig.3 is a view similar to that of Fig.2 of an arrangement according to a second embodiment of the invention. DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION
Fig. 1 shows very schematically a combustion engine 1 of a motor vehicle 2 provided with an arrangement for providing a reducing agent to an exhaust gas treatment device of an exhaust gas system of the combustion engine of the type to which the present invention pertains. It is pointed out that this diagram is heavily simplified and does only show members and equipment necessary for explaining the present invention. Exhaust gases leaving the com- bustion engine 1 pass through an exhaust line 3 and reach the environment via an exhaust outlet 4. An SCR catalyst 5 is arranged in the exhaust line 3. Exhaust gases from the combustion engine 1 are thus caused to pass through this catalyst 4 before they reach the environment via the exhaust outlet 3. An arrangement for providing a reducing agent to an exhaust gas treatment device in the form of a catalyst 5 comprises a tank 6 containing the agent, preferably in the form of a precursor, such as urea, for example obtainable under the trademark AdBlue®. A delivery line 7 connects the tank 6 to the catalyst 5 by an injection unit 8 arranged to inject reducing agent into the exhaust line 3 upstreams the SCR catalyst 5. A pump 9 is configured to transport the agent from the tank 6 through the delivery line to the injection unit 8. Connection members 10, 11 are arranged along the delivery line to connect different components to deliver line portions upstreams and downstreams of such connection members. Such a component may for instance be the pump 9 and the injection unit 8. A cooling liquid system 12 for cooling the internal combustion engine 1 is simplifiedly illustrated. This cooling liquid system has a pump 13 pumping a cooling liquid, such as cooling water, in a medium flow conducting line 14 in a loop passing the combustion engine where the water is heated and then along the delivery line 7 for transferring heat to the reducing agent contained therein.
Fig. 2 illustrates the appearance of an arrangement according to a first embodiment of the invention in the region of a connection member 10 for connecting a delivery line portion 7' to a component such as a pump. It is shown how a medium flow conducting line 14 follows the delivery line closely for transfer heat from the medium in the line 14 to the reducing agent inside the line 7'. A casing 15 surrounds the connection member 10 and allows the medium flow conducting line 14 to pass from an entrance 16 to an exit 17 of the casing while being kept by the casing to follow the connection member closely or bearing thereon. By having a part 18 of the medium flow conducting line extending along the connection member 10 and the casing 15 surrounding this part and the connection member an efficient heat transfer from the medium in the line 14 to the connection member and the reducing agent therein may be obtained. A suitable material, mainly for the mechanical properties thereof, for the casing 15 is PA (polyamide), such as polyamide 6. The shape of the casing may be adapted to the connection member and space available. The casing may have a first part making an angle to a second part which may be threaded onto the connection member 10. The casing may bear tightly onto the lines (hoses) 7', 14 or be slightly spaced with respect thereto but then possibly bear onto the lines 7', 14 and the line 14 at the respective end of the casing for improving thermal isolation of the interior of the casing.
Fig. 3 illustrates an embodiment in which the part 18' of the medium flow conducting line arranged inside the casing 15' is shorter than in the embodiment shown in Fig.2 and exits the casing in a mid-section thereof. A metal member 19 is instead arranged in the casing with surfaces 20 in contact with the exterior of the medium flow conducting line and surfaces 21 in contact with the exterior of the connection member 10 for heat transfer from the medium to the connection member mainly through this metal member. The invention is of course in no way restricted to the embodiments described above, since many possibilities to modifications thereof are likely to be obvious to one skilled in the art without having to deviate from the scope of the invention defined in the appended claims.

Claims

Claims
An arrangement for providing a reducing agent to an exhaust gas treatment device (1) of an exhaust gas system comprising
• a tank (6) containing said agent,
• a delivery line (7, 7') configured to connect the tank to a said exhaust gas treatment device for conducting said agent thereto,
• a pump (9) configured to transport said agent through said delivery line (7, 7'),
• a medium flow conducting line (14) following the delivery line closely over at least portions of the extension of the delivery line so as to transfer heat from said medium to the agent, and
• at least one connection member (10, 11) arranged in the extension of the delivery line (7, 7') to connect a component (9) to delivery line portions upstreams and downstreams thereof,
characterized in that the arrangement comprises a casing (15, 15') surrounding said connection member (10) and the casing contains means (18, 18', 19) configured to transfer heat from the medium flow conducting line (14) to the connection member (10).
2. An arrangement according to claim 1, characterized in that said means comprises a part (18, 18') of the medium flow conducting line (14) arranged inside the casing (15, 15').
3. An arrangement according to claim 2, characterized in that said part (18) of the medium flow conducting line (14) extends closely to and along the connection member (10) from a delivery line entrance (16) to a delivery line exit (17) of the casing (15).
An arrangement according to claim 3, characterized in that the casing (15) is designed to keep said part (18) of the medium flow conducting line (14) to bear on the connection member (10). An arrangement according to any of the preceding claims, characterized in that said means comprises a metal member (19) having surfaces (20) in contact with the exterior of the medium flow conducting line and surfaces (21) in contact with the exterior of the connection member (10) for heat transfer from said medium to the connection member.
An arrangement according to any of the preceding claims, characterized in that it comprises a plurality of said connection members (10) arranged in the extension of the delivery line (14), and that each connection member is provided with a said casing (15, 15') and said means (18, 18', 19) for heat transfer thereto.
An arrangement according to any of the preceding claims, characterized in that said medium flow conducting line (14) is part of a loop conducting medium for cooling a member (1) arranged in connection with the arrangement, such as an internal combustion engine producing exhaust gases to be treated by said device (5). An arrangement according to claim 7, characterized in that said medium flow conducting line (14) is configured to conduct a cooling liquid, such as cooling water, of a cooling liquid system (12).
A motor vehicle (2) comprising an internal combustion engine (1), an exhaust gas system and an exhaust gas treatment device (5) of said exhaust gas system configured to clean exhaust gases from the internal combustion engine, characterized in that the motor vehicle also comprises an arrangement according to any of the preceding claims configured to provide said exhaust gas treatment device with a reducing agent.
PCT/SE2017/051177 2016-12-22 2017-11-28 Arrangement for heating reducing agent line as well as coupling part and vehicle comprising the arrangement WO2018117929A1 (en)

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SE1651720-3 2016-12-22
SE1651720A SE541586C2 (en) 2016-12-22 2016-12-22 An arrangement for heating and providing a reducing agent to an exhaust treatment device

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4401091A (en) * 1981-07-24 1983-08-30 Modine Manufacturing Company Temperature controlled fuel heater
US4748960A (en) * 1986-04-14 1988-06-07 Gilbert Wolf Fuel system
US20090064666A1 (en) * 2006-04-13 2009-03-12 Waldemar Behrendt Heatable hose conduit system for an exhaust-gas aftertreatment system of an internal combustion engine
WO2009034833A1 (en) * 2007-09-10 2009-03-19 Usui Kokusai Sangyo Kaisha Limited Urea water piping structure for exhaust purification device for internal combustion engine
JP2009243279A (en) * 2008-03-28 2009-10-22 Kokoku Intech Co Ltd Thawing and heat retaining device of exhaust gas cleaning reducing agent
US20130277959A1 (en) * 2012-04-20 2013-10-24 Ti Automotive (Heidelberg) Gmbh Connector
WO2015151707A1 (en) * 2014-04-02 2015-10-08 ニッタ株式会社 Heating and heat-shielded piping

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4401091A (en) * 1981-07-24 1983-08-30 Modine Manufacturing Company Temperature controlled fuel heater
US4748960A (en) * 1986-04-14 1988-06-07 Gilbert Wolf Fuel system
US4748960B1 (en) * 1986-04-14 1992-07-28 Wolf Gilbert
US20090064666A1 (en) * 2006-04-13 2009-03-12 Waldemar Behrendt Heatable hose conduit system for an exhaust-gas aftertreatment system of an internal combustion engine
WO2009034833A1 (en) * 2007-09-10 2009-03-19 Usui Kokusai Sangyo Kaisha Limited Urea water piping structure for exhaust purification device for internal combustion engine
JP2009243279A (en) * 2008-03-28 2009-10-22 Kokoku Intech Co Ltd Thawing and heat retaining device of exhaust gas cleaning reducing agent
US20130277959A1 (en) * 2012-04-20 2013-10-24 Ti Automotive (Heidelberg) Gmbh Connector
WO2015151707A1 (en) * 2014-04-02 2015-10-08 ニッタ株式会社 Heating and heat-shielded piping

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SE541586C2 (en) 2019-11-12

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