WO2014203350A1 - Dispositif d'épuration de gaz d'échappement et procédé de décongélation d'agent de réduction liquide ou de précurseur associé - Google Patents

Dispositif d'épuration de gaz d'échappement et procédé de décongélation d'agent de réduction liquide ou de précurseur associé Download PDF

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Publication number
WO2014203350A1
WO2014203350A1 PCT/JP2013/066847 JP2013066847W WO2014203350A1 WO 2014203350 A1 WO2014203350 A1 WO 2014203350A1 JP 2013066847 W JP2013066847 W JP 2013066847W WO 2014203350 A1 WO2014203350 A1 WO 2014203350A1
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WIPO (PCT)
Prior art keywords
exhaust
casing
reducing agent
precursor
tank
Prior art date
Application number
PCT/JP2013/066847
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English (en)
Japanese (ja)
Inventor
慶太郎 渡邉
Original Assignee
ボルボ ラストバグナー アクチエボラグ
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Priority to PCT/JP2013/066847 priority Critical patent/WO2014203350A1/fr
Publication of WO2014203350A1 publication Critical patent/WO2014203350A1/fr

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    • 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
    • F01N3/103—Oxidation catalysts for HC and CO only
    • 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
    • F01N2610/10—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
    • F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
    • F01N2610/105—Control thereof
    • 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
    • F01N2610/148—Arrangement of sensors
    • 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
    • F01N2610/1486—Means to prevent the substance from freezing
    • 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 to an exhaust purification device that selectively reduces and purifies nitrogen oxide (NOx) in exhaust gas, and a method for thawing a liquid reducing agent or a precursor thereof used in the exhaust purification device.
  • NOx nitrogen oxide
  • SCR converter using ammonia generated by hydrolysis by injecting urea aqueous solution according to engine operating condition upstream of exhaust of selective reduction catalyst (SCR: Selective Catalytic Reduction) converter installed in engine exhaust pipe
  • SCR selective Catalytic Reduction
  • An exhaust gas purification device that purifies NOx to a harmless component by a selective reduction reaction is known. Since the urea aqueous solution freezes at about ⁇ 11 ° C., as described in Japanese Patent Application Laid-Open No. 2010-19134 (Patent Document 1), exhaust is led around the tank storing the urea aqueous solution, and the heat of the exhaust is used. A technique for thawing the aqueous urea solution in the tank has been proposed.
  • the exhaust purification element including the SCR converter and the tank are separated to some extent so that the heat of the exhaust purification element is not transmitted to the tank. It is necessary to. For this reason, the space occupied by the exhaust purification element and the tank tends to be large, and for example, it is difficult to secure a space for mounting other components outside the frame of the vehicle body.
  • an object of the present invention is to provide an exhaust purification device and a method for thawing a liquid reducing agent or a precursor thereof that can reduce the space occupied by the exhaust purification element and the tank.
  • the exhaust purification device includes an exhaust purification element including an SCR converter that purifies NOx in exhaust, an injection nozzle that injects a liquid reducing agent or a precursor thereof upstream of the SCR converter, and a liquid that is supplied from the injection nozzle.
  • An exhaust purification element including an SCR converter that purifies NOx in exhaust, an injection nozzle that injects a liquid reducing agent or a precursor thereof upstream of the SCR converter, and a liquid that is supplied from the injection nozzle.
  • a tank that stores the reducing agent or its precursor, and a casing that houses the tank so that an exhaust passage is formed between the tank and the tank.
  • the casing of the exhaust purification element and the casing are integrated with a heat insulating member interposed therebetween, and at least a part of the exhaust gas that has passed through the exhaust purification element is introduced into the exhaust passage of the casing.
  • a method for thawing a liquid reducing agent or a precursor thereof stores a casing of an exhaust purification element including an SCR converter that purifies NOx in exhaust gas, and a liquid reducing agent or a precursor thereof that is supplied by injection upstream of the exhaust of the SCR converter.
  • the casing containing the tank is integrated with a heat insulating member interposed therebetween, and at least a part of the exhaust gas that has passed through the exhaust purification element is introduced into the casing, so that the liquid reducing agent in the tank or a precursor thereof is added. Decompress.
  • the space occupied by the exhaust purification element and the tank can be reduced, and for example, other parts can be attached to the outside of the frame of the vehicle body.
  • FIG. 1 shows an example of an exhaust purification device that purifies particulate matter (PM) and NOx in exhaust gas.
  • An intake pipe 120 connected to the intake manifold 110 of the diesel engine 100 includes an air cleaner 130 that filters dust and the like in the intake air along a direction of intake air flow, a compressor 142 of the turbocharger 140 that supercharges intake air, and a compressor 142.
  • An intercooler 150 that cools the intake air that has passed and an intake collector 160 that smoothes the intake pulsation are arranged in this order.
  • an exhaust pipe 180 connected to an exhaust manifold 170 of the diesel engine 100 is provided with a turbine 144 of a turbocharger 140, a continuously regenerating diesel particulate filter (hereinafter referred to as “DPF”) along the exhaust circulation direction.
  • DPF diesel particulate filter
  • the oxidation catalytic converter 220 to be operated is arranged in this order.
  • the continuous regeneration type DPF device 190 includes a DOC (Diesel Oxidation Catalyst) converter 192 that oxidizes at least NO (nitrogen monoxide) to NO 2 (nitrogen dioxide), and a DPF 194 that collects and removes PM.
  • DOC Diesel Oxidation Catalyst
  • DPF 194 that collects and removes PM.
  • a CSF Catalyzed Soot Filter
  • a catalyst active component and additive component
  • the aqueous urea solution stored in the reducing agent tank 230 is supplied to the injection nozzle 200 via a reducing agent addition unit 240 having a built-in pump and flow control valve.
  • the reducing agent addition unit 240 may be divided into a pump module with a built-in pump and a dosing module with a built-in flow control valve.
  • the reducing agent tank 230 can be mentioned as an example of a tank.
  • a temperature sensor 250 for measuring the exhaust gas temperature is attached to the exhaust pipe 180 located between the continuous regeneration type DPF device 190 and the injection nozzle 200 in order to grasp the active state of the SCR converter 210. Further, a temperature sensor 260 for measuring the temperature of the urea aqueous solution (urea aqueous solution temperature) is attached to the reducing agent tank 230. The output signals of the temperature sensors 250 and 260 are input to a reducing agent addition control unit (DCU: Dosing Control Unit) 270 having a built-in computer.
  • DCU Dosing Control Unit
  • the DCU 270 electronically controls the diesel engine 100 via an in-vehicle network such as CAN (Controller Area Network) so that the rotation speed and load as an example of the engine operating state can be read at an arbitrary time.
  • a unit (ECU: Engine Control Unit) 280 is communicably connected.
  • the DCU 270 executes a control program stored in a nonvolatile memory such as a flash ROM (Read Only Memory), thereby controlling the pump and the flow rate of the reducing agent addition unit 240 based on the exhaust temperature, the rotation speed, and the load. Electronically control the valve. Further, the DCU 270 executes a control program to execute a urea aqueous solution thawing process, which will be described later, based on the urea aqueous solution temperature.
  • a nonvolatile memory such as a flash ROM (Read Only Memory)
  • a state quantity closely related to the engine torque such as a fuel injection amount, an intake air flow rate, an intake pressure, a supercharging pressure, and an accelerator opening degree can be used.
  • the rotational speed and load of the diesel engine 100 may be directly detected using a known sensor instead of reading from the ECU 280.
  • exhaust from the diesel engine 100 is introduced into the DOC converter 192 of the continuous regeneration type DPF device 190 through the exhaust manifold 170 and the turbine 144 of the turbocharger 140.
  • the exhaust gas introduced into the DOC converter 192 flows to the DPF 194 while NO is oxidized to NO 2 .
  • NO is oxidized to NO 2 .
  • PM in the exhaust gas is collected, and PM is continuously oxidized (incinerated) using NO 2 generated by the DOC converter 192.
  • the urea aqueous solution supplied (added) from the injection nozzle 200 according to the engine operating state is hydrolyzed using exhaust heat and water vapor in the exhaust, and converted into ammonia that functions as a reducing agent.
  • This ammonia is known to be selectively reduced with NOx in the exhaust gas in the SCR converter 210 and purified to harmless H 2 O (water) and N 2 (nitrogen).
  • NO is oxidized to NO 2 by the DOC converter 192, and the ratio of NO to NO 2 in the exhaust gas is improved to be suitable for the selective reduction reaction, so that the NOx purification rate in the SCR converter 210 is improved. be able to.
  • the ammonia that has passed through the SCR converter 210 is oxidized by the oxidation catalyst converter 220 disposed downstream of the exhaust gas, so that it is possible to suppress the ammonia from being released into the atmosphere as it is.
  • FIG. 2 shows an example of the layout of a vehicle equipped with an exhaust emission control device.
  • a front wheel FW as a driven wheel having a steering mechanism is attached to a front portion of a ladder-shaped frame FRM extending in the front-rear direction of the vehicle body.
  • a rear wheel RW as a drive wheel to which the driving force of the diesel engine 100 is transmitted is attached to the rear portion of the frame FRM.
  • the exhaust purification element refers to an element having a function of purifying exhaust, such as the DOC converter 192, the DPF 194, the SCR converter 210, and the oxidation catalyst converter 220.
  • a battery BTR, a spare tire STR, and three air reservoir tanks ARV are attached in this order from the front to the rear of the vehicle.
  • the exhaust purification apparatus 300 includes a first casing 310 that stores an exhaust purification element, a second casing 320 that stores a reducing agent tank 230, a first casing 310, and a second casing. 320, and a heat insulating member 330 interposed therebetween. Therefore, the first casing 310 and the second casing 320 are integrated with the heat insulating member 330 interposed therebetween.
  • the heat insulating member 330 for example, high silicate glass fiber having high temperature heat resistance can be used.
  • the 1st casing 310 can be mentioned as an example of another casing
  • the 2nd casing 320 can be mentioned as an example of a casing.
  • the first casing 310 includes a cylindrical first casing 312, a second cylindrical casing 314 that also has a cylindrical shape, and the far ends of the first casing 312 and the second casing 314. And a communication pipe 316 that communicates with each other.
  • the first housing 312 and the second housing 314 are arranged side by side so that the respective axes are substantially parallel (they may be just parallel in appearance; the same applies hereinafter).
  • the communication pipe 316 is also piped so that its axis is substantially parallel to the axis of the first casing 312 and the axis of the second casing 314.
  • the first casing 312 has an inlet 312A at the exhaust upstream end and an outlet 312B at the exhaust downstream end.
  • a continuous regenerative DPF device 190 that is, a DOC converter 192 and a DPF 194 is accommodated between the inlet 312A and the outlet 312B.
  • the second casing 314 has an inlet 314A formed at the exhaust upstream end and an outlet 314B formed at the exhaust downstream end.
  • the SCR converter 210 and the oxidation catalyst converter 220 are accommodated between the inlet 314A and the outlet 314B.
  • the communication pipe 316 is the exhaust downstream side of the first housing 312, which is the far ends of the first housing 312 and the second housing 314, in other words, the far ends located on the opposite sides of each other.
  • the exhaust port 312B is communicated with the inflow port 314A at the exhaust upstream end of the second housing 314. Therefore, the exhaust from the diesel engine 100 flows into the first casing 312 from the inlet 312A, passes through the DOC converter 192 and the DPF 194, and enters the communication pipe 316 from the outlet 312B.
  • the exhaust gas flows into the second casing 314 from the inlet 314A through the communication pipe 316, passes through the SCR converter 210 and the oxidation catalyst converter 220, and passes from the outlet 314B to the inside of the first casing 310. Discharged. That is, the exhaust passage extending from the first housing 312 to the second housing 314 via the communication pipe 316 is folded once by the communication pipe 316.
  • the communication pipe 316 is a straight straight pipe having bent portions formed at both ends for connection between the outlet 312B of the first casing 312 and the inlet 314A of the second casing 314.
  • the injection nozzle 200 is attached to the bent portion with respect to the discharge port 312B, and the urea aqueous solution is injected and supplied into the linear pipe. Thereby, the linear length required for the uniform diffusion of the urea aqueous solution into the exhaust gas is secured.
  • a mesh-like diffusion member may be installed in the communication pipe 316.
  • the first casing 310 is made of a metal material such as iron or stainless steel and has a capacity capable of exhibiting a muffler function as a muffler.
  • a discharge port 310 ⁇ / b> A is formed in the peripheral wall of the first casing 310 to discharge the exhaust discharged inside thereof to the outside. Accordingly, the exhaust discharged into the first casing 310 from the discharge port 314B of the second housing 314 is silenced by being expanded inside the second casing 310 and discharged from the discharge port 310A. Since the discharge port 310A of the first casing 310 can be formed at any position except the surface facing the second casing 320, it is possible to avoid interference with other parts arranged around the discharge port 310A. .
  • the second casing 320 is made of a metal material such as iron or stainless steel and has a capacity capable of forming an exhaust passage with the outer wall of the reducing agent tank 230.
  • the second casing 320 is communicated with the first casing 310 via a passage formed by a communication pipe 340 having a cylindrical shape.
  • the communication pipe 340 penetrates the heat insulating member 330 and communicates the first casing 310 and the second casing 320, the overall length thereof is shortened, and for example, an increase in weight can be suppressed. it can. Therefore, at least a part of the exhaust flowing inside the first casing 310 can be guided to the exhaust passage of the second casing 320 via the communication pipe 340.
  • the peripheral wall of the second casing 320 is formed with a discharge port 320 ⁇ / b> A for discharging the exhaust led from the first casing 310 to the exhaust passage to the outside. Since the discharge port 320A of the second casing 320 can be formed at any position except the surface facing the first casing 310, it is possible to avoid interference with other parts arranged around the discharge port 320A. .
  • the communication pipe 340 is provided with a shutter 360 such as a butterfly valve that is opened and closed by a remotely operable actuator 350 such as an electric motor or an air motor in order to open and close the exhaust passage.
  • a shutter 360 such as a butterfly valve that is opened and closed by a remotely operable actuator 350 such as an electric motor or an air motor in order to open and close the exhaust passage.
  • the DCU 270 determines that the urea aqueous solution is frozen based on the urea aqueous solution temperature measured by the temperature sensor 260, the DCU 270 outputs a valve opening signal to the actuator 350, and at least a part of the exhaust is reduced.
  • Guide around tank 230 The exhaust led to the periphery of the reducing agent tank 230 exchanges heat with the urea aqueous solution to defrost the urea aqueous solution, and is discharged to the outside through the discharge port 320A.
  • the shutter 360 may be disposed in the discharge port 310 ⁇ / b> A
  • a reducing agent addition unit 240 is attached to the upper surface of the second casing 320 that houses the reducing agent tank 230.
  • the supply pipe 370 for supplying the urea aqueous solution from the reducing agent addition unit 240 to the injection nozzle 200 is piped at least along the upper surface of the first casing 310, that is, at a position for receiving heat from the exhaust purification element. . Therefore, the supply pipe 370 can efficiently thaw the urea aqueous solution frozen inside by receiving heat of the exhaust gas from the first casing 310 without using a thawing device such as an electric heater, for example. Can do.
  • FIG. 4 shows an example of a control program that the DCU 270 repeatedly executes at predetermined time intervals when the ignition switch is turned on, for example.
  • step 1 abbreviated as “S1” in FIG. 4, the same applies hereinafter
  • the DCU 270 reads the urea aqueous solution temperature from the temperature sensor 260.
  • Step 2 the DCU 270 determines whether or not the urea aqueous solution stored in the reducing agent tank 230 is frozen. Specifically, the DCU 270 determines whether the urea aqueous solution temperature is equal to or lower than the freezing temperature of the urea aqueous solution.
  • the freezing temperature of the urea aqueous solution can be set slightly higher than ⁇ 11 ° C. in consideration of the possibility of freezing by running wind or the like. If the DCU 270 determines that the urea aqueous solution is frozen, the process proceeds to step 3 (Yes), whereas if it determines that the urea aqueous solution is not frozen, the process proceeds to step 4 (No).
  • step 3 the DCU 270 outputs a valve opening signal to the actuator 350, thereby opening the shutter 360 and causing the first casing 310 and the second casing 320 to communicate with each other.
  • a part of the exhaust gas that has passed through the exhaust purification element is guided from the first casing 310 to the second casing 320 through the communication pipe 340.
  • the exhaust gas guided to the second casing 320 contacts the peripheral wall of the reducing agent tank 230 to exchange heat with the urea aqueous solution, and thaws the urea aqueous solution frozen by the heat.
  • the urea aqueous solution frozen in the reducing agent tank 230 can be thawed in a short time.
  • the exhaust gas that has not been introduced from the first casing 310 into the second casing 320 is exhausted to the outside through the first casing outlet 310A, and the exhaust gas that has been introduced into the second casing 320 is 2 is discharged to the outside through the outlet 320A of the casing 320.
  • step 4 the DCU 270 outputs a valve closing signal to the actuator 350, thereby closing the shutter 360 and blocking communication between the first casing 310 and the second casing 320.
  • the urea aqueous solution stored in the reducing agent tank 230 does not excessively rise in temperature. It can suppress chemical reaction.
  • the urea aqueous solution is frozen is determined based on the temperature of the urea aqueous solution stored in the reducing agent tank 230.
  • a part of the exhaust gas is introduced from the first casing 310 to the second casing 320, and heat exchange is performed with the urea aqueous solution in the reducing agent tank 230. Thaw the frozen urea solution.
  • the occupied space in the frame FRM can be reduced as shown in FIG. For this reason, it becomes possible to arrange
  • the heat insulating member 330 makes it difficult for heat of the exhaust to be transmitted from the first casing 310 to the second casing 320, no problem occurs even if the exhaust purification element and the reducing agent tank 230 are arranged close to each other.
  • the exhaust purification element of the exhaust purification apparatus 300 it is only necessary to include at least the SCR converter 210 among the DOC converter 192, the DPF 194, the SCR converter 210, and the oxidation catalyst converter 220 as shown in FIGS.
  • the exhaust purification device 300 includes only the SCR converter 210, as shown in FIG. 5, the first casing 312 is accommodated in the first casing 310, and the second casing 314 and the communication pipe are accommodated. 316 becomes unnecessary.
  • one of the DPF 192 and the DOC converter 194 is accommodated in the first housing 312.
  • At least one of the first casing 310 and the second casing 320 in the exhaust purification apparatus 300 is not limited to the configuration in which the first casing 310 and the second casing 320 are arranged in the horizontal direction, as shown in FIGS. Thus, it can also be arranged in the vertical direction.
  • the communication pipe 316 that communicates the first housing 312 and the second housing 314 is the proximal end of the first housing 312 and the second housing 314. The parts communicate with each other.
  • the exhaust purification apparatus 300 includes a first casing 312 (which may be the second casing 314 or both) in which the exhaust purification element is accommodated, and a second casing 320, and a heat insulating member 330. May be integrated.
  • casing 312 can be mentioned as an example of a casing.
  • the liquid reducing agent or its precursor is not limited to an aqueous urea solution, and an ammonia aqueous solution, a light oil mainly composed of hydrocarbons, or the like is used depending on the function of the exhaust purification element that purifies exhaust harmful substances. You can also.
  • the freezing temperature for determining whether or not the liquid reducing agent or its precursor is frozen may be appropriately selected according to the characteristics.

Abstract

La présente invention concerne un dispositif d'épuration de gaz d'échappement, le logement d'éléments d'épuration de gaz d'échappement et le carter destiné à un réservoir étant formés en un corps comprenant un élément d'isolation thermique intercalé entre ceux-ci, lesdits éléments d'épuration de gaz d'échappement comprenant un convertisseur à réduction catalytique sélective (SCR) permettant d'épurer le NOx dans le gaz d'échappement, et ledit réservoir stockant un agent de réduction liquide ou un précurseur associé devant être fourni par injection au gaz d'échappement en amont du convertisseur SCR. Au moins une partie des gaz d'échappement ayant passé à travers les éléments d'épuration de gaz d'échappement est ensuite introduite dans le carter en vue d'une décongélation d'agent de réduction liquide ou de précurseur associé dans le réservoir.
PCT/JP2013/066847 2013-06-19 2013-06-19 Dispositif d'épuration de gaz d'échappement et procédé de décongélation d'agent de réduction liquide ou de précurseur associé WO2014203350A1 (fr)

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PCT/JP2013/066847 WO2014203350A1 (fr) 2013-06-19 2013-06-19 Dispositif d'épuration de gaz d'échappement et procédé de décongélation d'agent de réduction liquide ou de précurseur associé

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150128570A1 (en) * 2012-07-24 2015-05-14 Ud Trucks Corporation Exhaust gas purification apparatus, and method for thawing liquid reducing agent or precursor thereof
JP2017053327A (ja) * 2015-09-11 2017-03-16 日野自動車株式会社 排気浄化装置

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JP2001003729A (ja) * 1999-06-18 2001-01-09 Toyota Motor Corp 内燃機関の排気浄化装置
WO2006025110A1 (fr) * 2004-09-02 2006-03-09 Nissan Diesel Motor Co., Ltd. Épurateur de gaz d'échappement
JP2008101496A (ja) * 2006-10-18 2008-05-01 Toyota Motor Corp 排気系熱交換器
JP2010019134A (ja) * 2008-07-09 2010-01-28 Mitsubishi Fuso Truck & Bus Corp 内燃機関の排気浄化装置
JP2010138883A (ja) * 2008-12-15 2010-06-24 Denso Corp 排気浄化システムの制御装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001003729A (ja) * 1999-06-18 2001-01-09 Toyota Motor Corp 内燃機関の排気浄化装置
WO2006025110A1 (fr) * 2004-09-02 2006-03-09 Nissan Diesel Motor Co., Ltd. Épurateur de gaz d'échappement
JP2008101496A (ja) * 2006-10-18 2008-05-01 Toyota Motor Corp 排気系熱交換器
JP2010019134A (ja) * 2008-07-09 2010-01-28 Mitsubishi Fuso Truck & Bus Corp 内燃機関の排気浄化装置
JP2010138883A (ja) * 2008-12-15 2010-06-24 Denso Corp 排気浄化システムの制御装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150128570A1 (en) * 2012-07-24 2015-05-14 Ud Trucks Corporation Exhaust gas purification apparatus, and method for thawing liquid reducing agent or precursor thereof
US9732650B2 (en) * 2012-07-24 2017-08-15 Ud Trucks Corporation Exhaust gas purification apparatus, and method for thawing liquid reducing agent or precursor thereof
JP2017053327A (ja) * 2015-09-11 2017-03-16 日野自動車株式会社 排気浄化装置

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