WO2005085607A1 - Dispositif de contrôle d'échappement pour moteur - Google Patents

Dispositif de contrôle d'échappement pour moteur Download PDF

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Publication number
WO2005085607A1
WO2005085607A1 PCT/JP2005/001819 JP2005001819W WO2005085607A1 WO 2005085607 A1 WO2005085607 A1 WO 2005085607A1 JP 2005001819 W JP2005001819 W JP 2005001819W WO 2005085607 A1 WO2005085607 A1 WO 2005085607A1
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WO
WIPO (PCT)
Prior art keywords
reducing agent
washing water
agent supply
injection nozzle
supply path
Prior art date
Application number
PCT/JP2005/001819
Other languages
English (en)
Japanese (ja)
Inventor
Kiminobu Hirata
Nobuhiko Masaki
Hisashi Akagawa
Original Assignee
Nissan Diesel Motor Co., Ltd.
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 Nissan Diesel Motor Co., Ltd. filed Critical Nissan Diesel Motor Co., Ltd.
Publication of WO2005085607A1 publication Critical patent/WO2005085607A1/fr

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Classifications

    • 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
    • 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
    • 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

Definitions

  • the present invention provides an exhaust gas for reducing and removing nitrogen oxides (NOx), which are also discharged from a diesel engine or a gasoline engine mounted on a moving vehicle, by supplying a reducing agent to the exhaust gas upstream of a reduction catalyst in an exhaust passage. More specifically, the present invention relates to an exhaust gas purifying apparatus for an engine that cleans a reducing agent component deposited in a reducing agent supply path in a reducing agent supplying apparatus and prevents clogging of the reducing agent component. It is.
  • NOx nitrogen oxides
  • Patent Document 1 JP-A-2000-27627
  • a reducing agent for example, a urea aqueous solution (hereinafter referred to as a urea aqueous solution) is provided upstream of the reduction catalyst in the exhaust passage in accordance with the operating state of the engine such as the NOx emission amount and the exhaust temperature.
  • the amount of urea contained in the urea (reducing agent component) is controlled by the amount of urea contained in the urea water. May be deposited to cause clogging, and it may not be possible to inject urea water upstream of the exhaust gas of the reduction catalyst. In such a case, NO on the reduction catalyst The x-reduction reaction does not proceed, and there is a risk that NOx in the exhaust gas is directly discharged.
  • clogging of the reducing agent component in the reducing agent supply path in the reducing agent supply device may occur when light oil, gasoline, alcohols, or the like as a fuel is used as the reducing agent. May also occur due to impurities and the like contained in the reducing agent, and it may not be possible to inject the reducing agent upstream of the exhaust gas of the reduction catalyst. Also in this case, the NOx reduction reaction on the reduction catalyst does not proceed, and NOx in the exhaust gas may be discharged as it is.
  • the present invention addresses such a problem, and an engine for cleaning a reducing agent component deposited in a reducing agent supply path in a reducing agent supply device to prevent clogging of the reducing agent component. It is an object of the present invention to provide an exhaust emission control device.
  • an exhaust gas purification device for an engine in an exhaust system of an engine, and reduces and purifies nitrogen oxides in exhaust gas with a reducing agent.
  • An exhaust purification system for an engine comprising: an injection nozzle for injecting a reducing agent into the exhaust gas upstream of the reduction catalyst in an exhaust passage of an exhaust system; and a reducing agent supply device for supplying the reducing agent to the injection nozzle.
  • a dangling apparatus for detecting clogging of a reducing agent component on a path for supplying a reducing agent to the injection nozzle in the reducing agent supply device, and cleaning the reducing agent component deposited on the reducing agent supply path.
  • Cleaning water supply means for supplying cleaning water to be added is added to the reducing agent supply device.
  • the cleaning agent is supplied to the injection nozzle in the reducing agent supply device by the cleaning water supply unit added to the reducing agent supply device that supplies the reducing agent to the injection nozzle.
  • the clogging of the reducing agent component on the route to be performed is detected, and washing water for cleaning the precipitated reducing agent component is supplied to the reducing agent supply route to wash the clogged reducing agent component.
  • the reducing agent supply device includes a washing water inlet communicating with the vicinity of the upstream side of the throttle means for reducing the pressure air supplied from the upstream side on the reducing agent supply path, and A washing water outlet communicating with the vicinity of the downstream side of the mixing portion with the reducing agent downstream of the means is provided, and washing water supply means is connected to the washing water inlet.
  • the washing is performed by the washing water supply means connected to the washing water inlet communicating with the upstream side of the throttle means for reducing the pressure air supplied from the upstream side. Washing is performed by supplying water, and the washing water outlet force that is communicated with the vicinity of the downstream side of the portion mixed with the reducing agent downstream of the squeezing means is discharged.
  • the reducing agent supply device further includes a washing water inlet communicating with the upstream side of the throttle means for reducing the pressure air supplied from the upstream side on the reducing agent supply path.
  • a connection port to the spray nozzle is a cleaning water outlet downstream of the supply path, and a cleaning water supply unit is connected to the cleaning water inlet.
  • the washing is performed by the washing water supply means connected to the washing water inlet communicating with the upstream side of the throttle means for reducing the pressure air supplied from the upstream side.
  • Water is supplied for washing, and a connection port to the injection nozzle is discharged as a washing water outlet downstream of the reducing agent supply path.
  • the reducing agent supply device includes a washing water inlet communicating with the vicinity of the upstream side of the throttle means for reducing the pressure air supplied from the upstream side on the reducing agent supply path, and One washing water outlet communicating with the vicinity of the downstream side of the region where the reducing agent mixes with the reducing agent at the downstream side of the washing water, and connecting the connection port to the injection nozzle downstream of the reducing agent supply path with another washing water.
  • the washing water supply means is connected to the washing water inlet as an outlet.
  • the washing is performed by the washing water supply means connected to the washing water inlet communicating with the upstream side of the throttle means for reducing the pressure air supplied from the upstream side. Washing is performed by supplying water, and one washing water outlet force is discharged downstream of the squeezing means and communicates with the vicinity of the downstream side of the portion where the reducing agent is mixed, and the downstream side of the reducing agent supply path.
  • the connection port to the injection nozzle is discharged as another washing water outlet.
  • the reducing agent supply device is provided in the vicinity of the upstream side of the connection port to the injection nozzle on the downstream side of the throttle means for reducing the pressure air supplied from the upstream side on the reducing agent supply path.
  • a washing water inlet communicating therewith, a connection port to the injection nozzle being a washing water outlet downstream of the reducing agent supply path, and a washing water supply means provided at the washing water inlet. are connected.
  • the washing water communicating with the vicinity of the upstream side of the connection port to the injection nozzle on the downstream side of the throttle means for reducing the pressure air supplied from the upstream side.
  • the washing water is supplied by the washing water supply means connected to the inlet for washing, and the connection port to the injection nozzle is discharged as the washing water outlet downstream of the reducing agent supply path.
  • the reducing agent supply device further includes one washing water inlet communicating with the upstream side of the throttle means for reducing the pressure air supplied from the upstream side on the reducing agent supply path.
  • a cleaning water inlet communicating downstream of the throttling means with an upstream side of a connection port to the injection nozzle, and cleaning the connection port to the injection nozzle downstream of the reducing agent supply path.
  • a washing water supply means is connected to the first washing water inlet and the other washing water inlet as a water outlet.
  • one washing water inlet communicating with the vicinity of the upstream side of the throttle means for reducing the pressure air supplied from the upstream side and the downstream side of the throttle means.
  • the washing water is supplied and washed by washing water supply means connected to another washing water inlet connected to the vicinity of the upstream side of the connection port to the injection nozzle, and the injection nozzle is provided downstream of the reducing agent supply path. Discharge the connection port to the washing water outlet.
  • the reducing agent supply device may detect whether there is clogging of the reducing agent component between the downstream side of the throttle means and the upstream side of the connection port to the injection nozzle on the reducing agent supply path.
  • Pressure detecting means for detecting the clogging of the throttle means side or the injection nozzle side on the reducing agent supply path.
  • the presence or absence of clogging of the reducing agent component is detected by the pressure detecting means provided between the downstream side of the throttle means and the upstream side of the connection port to the injection nozzle on the reducing agent supply path. Then, it is detected whether the throttle means side or the injection nozzle side is clogged on the reducing agent supply path.
  • the washing water supply means includes a washing water tank storing the washing water, and pressurizes the washing water sent from the washing water tank to supply the washing water to the washing water inlet of the reducing agent supply device.
  • Cleaning water pump As a result, the washing water is stored in the washing water tank, and the washing water sent from the washing water tank is pressurized by the washing water pump and supplied to the washing water inlet of the reducing agent supply device.
  • the washing water supply means further includes a heater for heating the washing water sent from the washing water tank.
  • the cleaning water is supplied by the cleaning water supply means added to the reducing agent supply device that supplies the reducing agent to the injection nozzle.
  • the reducing agent component precipitated in the reducing agent supply path can be washed to prevent clogging of the reducing agent component. Therefore, the reducing agent can be smoothly supplied to the injection nozzle of the reducing agent supply device, and the reducing agent can be appropriately injected to the exhaust upstream side of the reduction catalyst provided in the exhaust system.
  • the reduction reaction on the reduction catalyst proceeds, and the purification rate of the nitrogen oxides in the exhaust gas can be improved.
  • the cleaning water inlet force that communicates with the vicinity of the upstream side of the throttle means for restricting the pressure air supplied from the upstream side on the reducing agent supply path. And discharged from the washing water outlet communicating with the vicinity of the downstream side of the mixing portion with the reducing agent downstream of the squeezing means, and deposited on the downstream side of the squeezing portion at the portion mixed with the reducing agent.
  • the clogging of the reducing agent component can be prevented by washing the reduced agent component.
  • the cleaning water inlet force that communicates with the vicinity of the upstream side of the throttle means for restricting the pressure air supplied from the upstream side on the reducing agent supply path is used.
  • the water was discharged from the connection port to the injection nozzle downstream of the reducing agent supply path as the washing water outlet, and was deposited between the connection port to the injection nozzle downstream of the reducing agent supply path. By washing the reducing agent component, clogging of the reducing agent component can be prevented.
  • the washing water inlet force that communicates with the vicinity of the upstream side of the throttle means for reducing the pressure air supplied from the upstream side on the reducing agent supply path.
  • discharges one washing water outlet force communicating with the vicinity of the downstream side of the portion mixed with the reducing agent and discharges the injection nozzle downstream of the reducing agent supply path.
  • a reducing agent is provided downstream of the throttle means. It is possible to wash the reducing agent component deposited between the portion where the reducing agent is mixed and the connection port to the injection nozzle downstream of the reducing agent supply path, thereby preventing the reducing agent component from being clogged.
  • washing is performed from one washing water inlet communicating with the vicinity of the upstream side of the throttle means for reducing the pressure air supplied from the upstream side on the reducing agent supply path.
  • Water is supplied, and washing water is supplied from another washing water inlet downstream of the throttling means and communicated with the vicinity of the upstream side of the connection port to the injection nozzle, and the connection port to the injection nozzle is washed water outlet.
  • the reducing agent component precipitated between the connection side to the injection nozzle and the downstream side of the reducing agent supply path is washed to prevent the reducing agent component from being clogged.
  • the presence or absence of clogging of the reducing agent component is detected by the pressure detecting means, and the upstream side of the throttle means side or the downstream of the reducing agent supply path on the reducing agent supply path. Detecting whether the injection nozzle is clogged, supplying cleaning water from the corresponding cleaning water inlet, discharging the cleaning water outlet, and cleaning the reducing agent component deposited on the reducing agent supply path. Thus, clogging of the reducing agent component can be prevented.
  • the cleaning water sent from the cleaning water tank is pressurized by the cleaning water pump and supplied to the cleaning water inlet of the reducing agent supply device, thereby providing the reducing agent supply. It is possible to reliably clean the reducing agent component deposited on the supply route and prevent the reducing agent component from being clogged.
  • the cleaning water sent from the cleaning water tank is heated by the heater, thereby improving the cleaning property of the reducing agent component deposited on the reducing agent supply path.
  • clogging of the reducing agent component can be prevented.
  • FIG. 1 is a conceptual diagram showing an embodiment of an exhaust purification device for an engine according to the present invention.
  • FIG. 2 is a system diagram showing a main part of the exhaust gas purification apparatus for an engine.
  • FIG. 3 is an explanatory sectional view showing the internal structure of a reducing agent supply device in the exhaust gas purification device for an engine.
  • FIG. 4 is a flowchart illustrating a cleaning operation of a reducing agent component in the reducing agent supply device.
  • FIG. 5 is a flowchart illustrating a cleaning operation of a reducing agent component in the same reducing agent supply device. Explanation of symbols
  • FIG. 1 is a conceptual diagram showing an embodiment of an exhaust gas purification apparatus for an engine according to the present invention.
  • This exhaust gas purifying device is for reducing and removing NOx exhausted from a diesel engine, a gasoline engine, etc. mounted on a moving vehicle using a reducing agent.
  • the exhaust gas from engine 1 using gasoline or light oil as fuel is discharged from the exhaust manifold 2 into the atmosphere via an exhaust pipe 3 as an exhaust passage.
  • the exhaust pipe 3 is provided with an oxidation catalyst 4 for nitric oxide (NO), a reduction catalyst 5 for NOx, and an oxidation catalyst 6 for ammonia slip in the order of the exhaust upstream force.
  • NOx sensor, etc. are arranged to configure the exhaust system, but the detailed configuration is not shown.
  • the oxidation catalyst 4 reduces NO and the like in the exhaust gas passing through the exhaust pipe 3 by an oxidation reaction. Therefore, the oxidation catalyst 4 is made of a material having excellent heat resistance and corrosion resistance, such as stainless steel, and crosses a honeycomb shape.
  • a monolith type catalyst carrier having a surface is provided with a honeycomb catalyst in which a noble metal such as platinum is supported on the surface of a porous member such as alumina.
  • hydrocarbons (HC) and carbon dioxide (CO 2) in the exhaust gas are also reduced by the oxidation reaction.
  • the NOx reduction catalyst 5 is for reducing and purifying NOx in the exhaust gas passing through the exhaust pipe 3 with a reducing agent.
  • a honeycomb made of ceramic cordierite or FeCrA1-based heat-resistant steel is used.
  • a zeolite-based active component is supported on a monolith-type catalyst support having a cross-sectional shape. Then, the active component supported on the catalyst carrier is activated by receiving a reducing agent, and effectively purifies NOx in the exhaust gas to a harmless substance.
  • an oxidation catalyst 6 for ammonia slip is disposed downstream of the NOx reduction catalyst 5.
  • An injection nozzle 7 is provided inside the exhaust pipe 3 upstream of the NOx reduction catalyst 5. It is.
  • the injection nozzle 7 injects a reducing agent into the exhaust gas upstream of the NOx reduction catalyst 5 inside the exhaust pipe 3, and the reducing agent is supplied together with pressure air from a reducing agent supply device 8 described later.
  • the fuel is supplied into the exhaust pipe 3 by injection.
  • the tip of the injection nozzle 7 extends toward the downstream side substantially in parallel with the flow direction A of the exhaust gas, but is substantially perpendicular to the flow direction A of the exhaust gas in the exhaust pipe 3. It may be one that sticks out.
  • the injection nozzle 7 is connected to a reducing agent supply device 8.
  • the reducing agent supply device 8 supplies a reducing agent to the injection nozzle 7.
  • the reducing agent stored in a storage tank 9 is supplied through a supply pipe 10 and mixed with pressure air inside.
  • the reducing agent is supplied to the injection nozzle 7.
  • an aqueous urea solution (urine water) is used as the reducing agent injected and supplied by the injection nozzle 7.
  • an aqueous ammonia solution or the like may be used.
  • the urea water injected and supplied by the injection nozzle 7 is hydrolyzed by the exhaust heat in the exhaust pipe 3 to easily generate ammonia.
  • the obtained ammonia reacts with NOx in the exhaust gas in the NOx reduction catalyst 5, and is purified into water and harmless gas.
  • the urea water is an aqueous solution of solid or powdered urea, stored in a storage tank 9, and supplied to a reducing agent supply device 8 through a supply pipe 10.
  • the reducing agent supply device 8 is connected to an ECU (Engine Control Unit) 11 as a control circuit using a CPU, for example, by a signal line 12, and the control signal sent from the ECU 11 causes the reducing agent to be supplied.
  • the operation of the agent supply device 8 is controlled so that the supply of the reducing agent from the injection nozzle 7 is controlled.
  • exhaust gas generated by the operation of the engine 1 passes through the exhaust manifold 2 via the exhaust pipe 3 via the exhaust pipe 3, the oxidation catalyst 4, the NOx reduction catalyst 5, and the ammonia
  • the gas passes through the slip catalyst 6 for slip and is discharged into the atmosphere at the end of the exhaust pipe 3.
  • urea water is injected from the injection nozzle 7 disposed inside the exhaust pipe 3 on the exhaust upstream side of the NOx reduction catalyst 5.
  • urea water is supplied from the urea water storage tank 9 to the reducing agent supply device 8 via the supply pipe 10, and the operation of the reducing agent supply device 8 causes the urea water to rise together with the pressure air. It is supplied to the injection nozzle 7 and is injected and supplied into the exhaust gas.
  • the supply of the urea water from the storage tank 9 is cut off by the operation of the reducing agent supply device 8, After that, only pressurized air is supplied to the injection nozzle 7 for a while. As a result, the urea water is expelled from the nozzle body of the injection nozzle 7 and the injection hole cap, and the injection of the urea water ends.
  • washing water supply means is added to the reducing agent supply device 8.
  • the washing water supply means detects whether or not the component (urea) contained in the reducing agent is clogged on the path for supplying the reducing agent (urea water) to the injection nozzle 7 in the reducing agent supply device 8.
  • the cleaning water is supplied to the reducing agent supply passage for cleaning the reducing agent component (urea) precipitated, and includes a cleaning water tank 13 and a cleaning water pump 14.
  • the washing water tank 13 stores washing water for washing urea precipitated in the reducing agent supply path, and for example, as shown in Fig. 2, also has one independent container power.
  • a washing water pump 14 is provided on a water supply pipe 15 for sending washing water from the washing water tank 13 to the reducing agent supply device 8.
  • the washing water pump 14 pressurizes the washing water sent from the washing water tank 13 and supplies the washing water to the washing water inlet of the reducing agent supply device 8. It is designed to pressurize to a predetermined pressure.
  • a filter 16 is provided on the water supply pipe 15 in front of the washing water pump 14 so as to remove dirt and foreign matter contained in the washing water sent from the washing water tank 13. I have.
  • a heater 17 is further provided on the water supply pipe 15 at a stage subsequent to the washing water pump 14. Since the heater 17 heats the washing water sent from the washing water tank 13, the heater 17 also has an appropriate heating means power to heat the washing water to a predetermined temperature. In this case, the cleaning property of urea deposited on the reducing agent supply path in the reducing agent supply device 8 can be improved.
  • an air tank 18 is connected to the reducing agent supply device 8.
  • the air tank 18 supplies pressure air that mixes with the urea water supplied into the reducing agent supply device 8 from the storage tank 9 shown in FIG. Then, in a state where the urea water and the pressure air are mixed in the reducing agent supply device 8, the injection nozzle 7 is Is supplied with a reducing agent.
  • the washing water tank 13 has a force that also constitutes an independent container force.
  • the present invention is not limited to this.
  • Cooling water may be used as washing water. In this case, it is considered that the occasion of washing in the reducing agent supply device 8 is not frequent, so that the washing can be performed with the spare tank of the engine cooling water.
  • FIG. 3 is an explanatory sectional view showing the internal structure of the reducing agent supply device 8.
  • a reducing agent supply path 20 which is a path for supplying urea water from the storage tank 9 to the injection nozzle 7 is formed in the center of the reducing agent supply device 8.
  • a reducing agent inlet 22 is provided via one branch pipe 21a, and a pressure air inlet 23 is provided via another branch pipe 21b.
  • an orifice 24 is formed in the middle of the other branch pipe 21b as throttle means for reducing the pressure air supplied from the air tank 18 shown in FIG.
  • a first washing water inlet 26 is provided through a communication pipe 25 branched from the vicinity of the upstream side of the orifice 24.
  • This first washing water inlet 26 serves as one washing water inlet communicating with the vicinity of the upstream side of the orifice 24 for restricting the pressure air supplied on the upstream side of the reducing agent supply path 20.
  • a first washing water outlet 28 is provided via a communication pipe 27 branched from the vicinity of the downstream side of the orifice 24.
  • the first washing water outlet 28 serves as one washing water outlet that communicates with the vicinity of the downstream side of the orifice 24 where the urea water is mixed.
  • a downstream side of the orifice 24 is connected via a communication pipe 29 branching off from a portion near the upstream side of the connection port to the injection nozzle 7.
  • Two wash water inlets 30 are provided.
  • the second washing water inlet 30 communicates with the upstream side of the connection port to the injection nozzle 7 on the downstream side of the orifice 24 for restricting the pressure air supplied on the upstream side of the reducing agent supply path 20 on the reducing agent supply path 20.
  • Other washing water inlet is used as the second washing water outlet 31!
  • This second washing water outlet 31 is another washing water outlet which is a connection port to the injection nozzle 7 on the downstream side of the reducing agent supply path 20.
  • a pressure sensor 32 is provided on the reducing agent supply path 20 between the downstream side of the orifice 24 and the upstream side of the connection port (31) to the injection nozzle 7.
  • the pressure sensor 32 serves as pressure detecting means for detecting the presence or absence of clogging of the reducing agent component (urea) on the reducing agent supply path 20, and the orifice 24 on the reducing agent supply path 20 Clogging on the side or the clogging on the injection nozzle 7 side is detected.
  • the pressure sensor 32 detects the pressure of the mixed fluid of the urea water and the pressure air supplied and flowing into the reducing agent supply path 20.
  • reference numeral 33 denotes a pump for pumping the urea water from the storage tank 9 to the reducing agent supply path 20.
  • Reference numeral 34 denotes a reducing agent pressure sensor for detecting the pressure of urea water sent from the pump 33.
  • Reference numeral 123445 denotes a shutoff valve provided on the reducing agent supply path 20 or on each pipe. Also
  • reference numeral 35 denotes a drain pipe connected to the first washing water outlet 28 shown in FIG.
  • the reducing agent inlet 22 is connected to the supply pipe 10 from the reducing agent storage tank 9 shown in FIG.
  • the air pipe from the air tank 18 shown in FIG. 2 is connected, and the first water inlet 26 and the second water inlet 30 are connected to the water supply pipe 15 from the water tank 13 shown in FIG.
  • Five types of types can be configured: (5) a type in which the washing is provided with the first washing water inlet 26, the second washing water inlet 30, and the second washing water outlet 31. Further, a type in which the first washing water inlet 26 and the second washing water inlet 30 and the first washing water outlet 28 and the second washing water outlet 31 are all provided for washing is also conceivable.
  • the cleaning operation of the precipitated urea in the reducing agent supply device 8 thus configured is described. This will be described with reference to the flowcharts shown in FIGS.
  • the exhaust gas generated by the operation of the engine 1 is disposed in the exhaust pipe 3 from the exhaust manifold 2 via the exhaust pipe 3.
  • the NOx reduction catalyst 5, and the ammonia slip oxidation catalyst 6 the exhaust gas is discharged into the atmosphere from the outlet at the end of the exhaust pipe 3.
  • urea water is injected from the injection nozzle 7 disposed inside the exhaust pipe 3 on the exhaust upstream side of the NOx reduction catalyst 5.
  • urea water is supplied from a urea water storage tank 9 shown in FIG. 2 through a supply pipe 10 to a reducing agent supply device 8, and pressurized air is supplied from an air tank 18, and the reducing agent supply device 8 By this operation, the urea water is supplied to the injection nozzle 7 together with the pressure air, and is injected and supplied into the exhaust gas.
  • the pressure in the reducing agent supply path 20 is detected and confirmed by the pressure sensor 32 provided in the middle of the reducing agent supply path 20 in the reducing agent supply device 8 shown in FIG. (Step Sl in Figure 4).
  • the normal value of the pressure Pa in the reducing agent supply path 20 is a certain predetermined pressure P (P ⁇ P)
  • step S2 the pressure Pa in the passage becomes the predetermined pressure P
  • step S4 it is determined that the injection nozzle 7 is clogged on the downstream side of the reducing agent supply path 20.
  • a detection signal is sent from the pressure sensor 32 to the ECU 11 shown in FIG. 1, it is determined that the injection nozzle 7 is clogged, and a control signal is sent back to the reducing agent supply device 8 to control the supply of the reducing agent. Is interrupted (step S4).
  • step S5 a first shutoff valve V and a second shutoff valve V
  • the count of the timer is started at the same time as the start of the above-mentioned cleaning, and when the cleaning operation has elapsed. Interval is detected and confirmed (step S6). Then, the elapsed time Ta is greater than the predetermined time T.
  • the power is judged to be no power (step S7).
  • the above elapsed time Ta is longer than the predetermined time T.
  • step S8 the process proceeds to the "YES" side to end the cleaning (step S8).
  • urea deposited between the reducing agent supply path 20 and the connection port to the injection nozzle 7 on the downstream side can be washed.
  • a first shutoff valve V for example, a first shutoff valve V, a third shutoff valve V, and a fourth shutoff valve V
  • shutoff valve V Close the shutoff valve V, and close the second shutoff valve V, the fifth shutoff valve V, and the sixth shutoff valve.
  • step S9 Open the passage so that the pressure air flows. Thereby, the supply control of the reducing agent by the reducing agent supply device 8 is restarted (step S9).
  • step S2 of FIG. 4 if the pressure Pa in the passage is equal to or lower than the predetermined pressure P, “NO
  • the pressure Pa in the passage is higher than the predetermined pressure P.
  • step S14 it is determined that the orifice 24 is clogged on the upstream side of the reducing agent supply path 20.
  • a detection signal is sent from the pressure sensor 32 to the ECU 11 shown in FIG. 1, and it is determined that the orifice 24 is clogged, and a control signal is sent back to the reducing agent supply device 8 to control the supply of the reducing agent. Is interrupted (step S14).
  • shut-off valves are closed and other shut-off valves are opened, and cleaning water is supplied to the upstream side of the reducing agent supply path 20 to perform washing. Cleaning is started (step S15).
  • a third shutoff valve V and a fifth shutoff valve V are opened, and cleaning water is supplied to the upstream side of the reducing agent supply path 20 to perform washing. Cleaning is started (step S15).
  • the purified water is supplied and discharged from the first washing water outlet 28.
  • steps S16-S19 shown in FIG. 5 are performed in exactly the same manner as steps S6-S9 shown in FIG. 4, and the branching pipe 21a is provided on the reducing agent supply path 20 downstream of the orifice 24.
  • the path for cleaning the reducing agent component precipitated in the reducing agent supply path 20 is not limited to the path described with reference to FIGS. 4 and 5, and may be selected according to the site where the reducing agent component is deposited.
  • the desired path can be cleaned.

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  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Health & Medical Sciences (AREA)
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  • General Engineering & Computer Science (AREA)
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  • Oil, Petroleum & Natural Gas (AREA)
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  • Exhaust Gas After Treatment (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

Dispositif de contrôle d'émissions d'échappement d'un moteur permettant d'empêcher que les composants d'un agent réducteur soient obstrués par le lavage des composants de l'agent réducteur déposé dans le circuit d'acheminement d'agent réducteur d'un dispositif d'alimentation en agent réducteur alimentant l'agent réducteur à une buse d'injection. Le dispositif de contrôle d'émissions d'échappement comprend un catalyseur de réduction (5) disposé dans le système d'échappement d'un moteur (1) et réduisant/purifiant des oxydes d'azote dans les gaz d'échappement avec l'agent de réduction, la buse d'injection (7) injectant l'agent réducteur sur le côté amont de gaz d’échappement du catalyseur de réduction (5) dans le passage de gaz d'échappement (3) du système d'échappement, et le dispositif d'alimentation en agent réducteur (8) alimentant l’agent réducteur à la buse d'injection (7). L'engorgement des composants de l'agent réducteur dans le circuit d'alimentation d'agent réducteur à la buse d'injection (7) est détecté dans le dispositif d'alimentation d'agent réducteur (8) et des moyens d'alimentation en eau de lavage (13) et (14) pour laver les composants de l'agent réducteur déposé dans le circuit d'alimentation d'agent réducteur sont ajoutés au dispositif d'alimentation en agent réducteur (8). Les composants de l'agent réducteur déposés dans le circuit d'alimentation d'agent réducteur peuvent donc être lavés dans le dispositif d'alimentation en agent réducteur (8).
PCT/JP2005/001819 2004-03-08 2005-02-08 Dispositif de contrôle d'échappement pour moteur WO2005085607A1 (fr)

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JP2004064058A JP4137821B2 (ja) 2004-03-08 2004-03-08 エンジンの排気浄化装置
JP2004-064058 2004-03-08

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JP2010059831A (ja) * 2008-09-02 2010-03-18 Mitsubishi Motors Corp 排気浄化装置
CN102725490A (zh) * 2009-12-23 2012-10-10 卡特彼勒公司 用于将还原剂引入到排气流中的方法

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JP4509871B2 (ja) * 2005-06-09 2010-07-21 三菱ふそうトラック・バス株式会社 排気浄化装置
JP4606363B2 (ja) * 2006-03-29 2011-01-05 Ｕｄトラックス株式会社 排気浄化装置
JP4799289B2 (ja) * 2006-06-26 2011-10-26 Ｕｄトラックス株式会社 エンジンの排気浄化装置
JP2009079540A (ja) * 2007-09-26 2009-04-16 Mitsubishi Heavy Ind Ltd 排ガス浄化システムおよび排ガス浄化方法
US8459012B2 (en) * 2008-11-19 2013-06-11 Caterpillar Inc. Method for purging a dosing system
KR102466782B1 (ko) * 2016-05-27 2022-11-16 에이치에스디엔진 주식회사 환원제 공급 시스템
CN107321536A (zh) * 2017-07-31 2017-11-07 苏州卡布斯精工科技有限公司 一种尿素喷嘴清洗装置及修复方法

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JP2003062427A (ja) * 2001-08-27 2003-03-04 Miura Co Ltd 脱硝装置の洗浄方法およびその装置
JP2003269145A (ja) * 2002-03-11 2003-09-25 Mitsubishi Fuso Truck & Bus Corp 内燃機関のＮＯｘ浄化装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010059831A (ja) * 2008-09-02 2010-03-18 Mitsubishi Motors Corp 排気浄化装置
CN102725490A (zh) * 2009-12-23 2012-10-10 卡特彼勒公司 用于将还原剂引入到排气流中的方法
CN102725490B (zh) * 2009-12-23 2015-04-15 卡特彼勒公司 用于将还原剂引入到排气流中的方法

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