WO2010067805A1 - 排ガス浄化装置 - Google Patents
排ガス浄化装置 Download PDFInfo
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- WO2010067805A1 WO2010067805A1 PCT/JP2009/070564 JP2009070564W WO2010067805A1 WO 2010067805 A1 WO2010067805 A1 WO 2010067805A1 JP 2009070564 W JP2009070564 W JP 2009070564W WO 2010067805 A1 WO2010067805 A1 WO 2010067805A1
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- exhaust gas
- ammonia
- concentration
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- scr catalyst
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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]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
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- 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
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
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- 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
- B01D53/9459—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts
- B01D53/9477—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts with catalysts positioned on separate bricks, e.g. exhaust systems
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- 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
- B01D53/9495—Controlling the catalytic process
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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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
- F01N13/0093—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are of the same type
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/10—Noble metals or compounds thereof
- B01D2255/102—Platinum group metals
- B01D2255/1021—Platinum
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/207—Transition metals
- B01D2255/20723—Vanadium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/50—Zeolites
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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
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
- F01N2560/021—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting ammonia NH3
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- the present invention relates to an exhaust gas purification device that reduces nitrogen oxides discharged from an internal combustion engine.
- urea is injected into an exhaust pipe for guiding exhaust gas, ammonia is generated from urea in the exhaust pipe, and the generated ammonia reacts with nitrogen oxide in the exhaust gas.
- Patent Document 1 describes an exhaust gas purification system in which a DPF device and a selective catalytic reduction catalyst device are arranged in order from upstream in an exhaust passage of an internal combustion engine. Further, in Patent Document 1, the NOx emission amount is calculated from the NOx emission map for normal operation during normal operation, and the NOx emission amount is calculated from the NOx emission map for forced regeneration during forced regeneration of the DPF device. To calculate the supply amount of the ammonia-based aqueous solution corresponding to the calculated NOx emission amount, and the ammonia-based aqueous solution on the upstream side of the selective catalytic reduction catalyst device so as to be the calculated supply amount. An apparatus for feeding into exhaust gas is described.
- Patent Document 2 describes a denitration device for exhaust gas discharged from a combustion plant such as a waste incinerator instead of treating exhaust gas from an internal combustion engine.
- the NOx concentration in the pre-treatment gas and the exhaust gas after treatment Measure ammonia concentration, NOx concentration of exhaust gas, and flow rate of exhaust gas.
- the injection amount of urea is controlled based on a map created in advance.
- the concentration of nitrogen oxides and the exhaust gas after treatment are controlled.
- nitrogen oxides can be reduced and the amount of ammonia can also be adjusted.
- an oxidation catalyst for oxidizing ammonia is installed on the downstream side of a denitration device such as a selective catalytic reduction catalyst device.
- oxidation of ammonia generates nitrogen oxides. There is a problem of becoming. Further, there is a problem that if the amount of ammonia leaking is large, it is necessary to enlarge the oxidation catalyst.
- the present invention has been made in view of the above, and calculates an appropriate amount of a reducing agent (ammonia) such as urea to be injected into the exhaust pipe, making it difficult for ammonia to leak downstream, and in the exhaust gas. It aims at providing the exhaust gas purification apparatus which can reduce nitrogen oxide efficiently.
- a reducing agent such as urea
- the present invention provides an exhaust gas purifying apparatus that reduces nitrogen oxides contained in exhaust gas discharged from an internal combustion engine, the exhaust gas discharged from the internal combustion engine
- An exhaust pipe for guiding, an ammonia supply means for supplying ammonia into the exhaust pipe, an SCR catalyst for promoting a reaction between the supplied ammonia and the nitrogen oxide, and the SCR catalyst disposed inside the exhaust pipe.
- a support mechanism for supporting inside the exhaust pipe, a catalyst means disposed downstream of the position where the ammonia is supplied in the flow direction of the exhaust gas, and a region in which the catalyst means is disposed Based on the ammonia concentration measuring means for measuring the concentration of ammonia in the exhaust gas at the measurement position and the measurement result of the ammonia concentration measuring means And having a an injection control means for controlling the supply of ammonia by the ammonia supply means.
- the present invention provides an exhaust gas purifying apparatus that reduces nitrogen oxides contained in exhaust gas discharged from an internal combustion engine, the exhaust gas discharged from the internal combustion engine Exhaust pipe for guiding, urea water injection means for injecting urea water into the exhaust pipe, urea SCR catalyst for promoting reaction between ammonia generated from the injected urea water and the nitrogen oxide, and the exhaust pipe And a support mechanism for supporting the urea SCR catalyst inside the exhaust pipe, and a catalyst means disposed downstream of the position where the urea water is injected in the flow direction of the exhaust gas.
- the ammonia concentration measuring means for measuring the concentration of ammonia in the exhaust gas at the measurement position in the area where the catalyst means is disposed, and the ammonia concentration measuring means And having a an injection control means for controlling the injection of urea water by the urea-water injecting unit based on the measurement results.
- the ammonia concentration measuring means is configured so that the ammonia SCR catalyst is disposed in the exhaust gas in a state where the ammonia is excessively introduced into the urea SCR catalyst in the flow direction of the exhaust gas in the region where the urea SCR catalyst of the catalyst means is disposed.
- the nitrogen oxide concentration at the maximum load of the internal combustion engine is the concentration at the inlet of the urea SCR catalyst at the minimum load of the internal combustion engine or the maximum load of the internal combustion engine.
- Theoretical nitrogen that can be denitrated at a nitrogen oxide concentration of 10 ppm at the maximum load of the internal combustion engine from a position that is the higher of the concentrations at half the concentration at the inlet of the urea SCR catalyst. It is preferable to detect the ammonia concentration of the exhaust gas at a position included in a region up to a position where the oxide concentration is reached.
- the catalyst means includes the first catalyst and the second catalyst arranged downstream of the first catalyst and the first catalyst in the flow direction of the exhaust gas, and the first catalyst and the first catalyst. It is preferable that a connecting pipe for connecting the second catalyst is provided, the ammonia concentration measuring means is arranged in the connecting pipe, and the measurement position is in the connecting pipe.
- a particulate matter reducing device that is disposed between the urea water injection means and the internal combustion engine and reduces particulate matter contained in the exhaust gas.
- a nitrogen oxide concentration measuring means for measuring the concentration of nitrogen oxide in the exhaust gas at the measurement position.
- the gas purification device can measure the ammonia concentration in the catalyst means more accurately to grasp the ammonia reacting with the nitrogen oxides, and inject urea based on the measurement result.
- the amount that is, the amount of reducing agent introduced, it is possible to make it difficult for ammonia to leak from the purifier and to effectively reduce nitrogen oxides in the exhaust gas.
- FIG. 1 is a block diagram showing a schematic configuration of an embodiment of a vehicle having a diesel engine to which an exhaust gas purification device is attached.
- FIG. 2 is a block diagram showing a schematic configuration of the concentration measuring means of the exhaust gas purification apparatus shown in FIG.
- FIG. 3 is a graph showing the relationship between the length from the inlet of the urea SCR catalyst and the nitrogen oxide concentration.
- FIG. 4 is a block diagram showing a schematic configuration of another embodiment of a vehicle having a diesel engine to which an exhaust gas purification device is attached.
- FIG. 5 is a graph showing an example of the measurement result.
- FIG. 6 is a graph showing an example of the measurement result.
- FIG. 7 is a graph showing an example of the measurement result.
- FIG. 8 is a graph showing an example of measurement results.
- the internal combustion engine to which the exhaust gas purification device is attached will be described as a diesel engine and a vehicle using a diesel engine.
- the internal combustion engine is not limited to this, and various internal combustion engines such as a gasoline engine and a gas turbine. Can be used.
- the apparatus having the internal combustion engine is not limited to the vehicle, and can be used as an internal combustion engine of various apparatuses such as a ship and a generator.
- FIG. 1 is a block diagram showing a schematic configuration of an embodiment of a vehicle having a diesel engine to which an exhaust gas purification apparatus of the present invention is attached
- FIG. 2 is a concentration measurement of the exhaust gas purification apparatus for a diesel engine shown in FIG.
- the vehicle 10 includes a diesel engine 12, an exhaust pipe 14 that guides exhaust gas discharged from the diesel engine 12, and an exhaust gas purification device 16 that purifies the exhaust gas flowing through the exhaust pipe 14.
- the vehicle 10 has various elements necessary for the vehicle, such as wheels, a vehicle body, an operation unit, and a transmission, in addition to the illustrated configuration.
- the diesel engine 12 is an internal combustion engine that uses light oil or heavy oil as fuel, and burns the fuel to extract power.
- One end of the exhaust pipe 14 is connected to the diesel engine 12, and guides exhaust gas discharged from the diesel engine 12.
- the exhaust gas purification device 16 includes an oxidation catalyst 18, a DPF 20, an injection unit 22, a urea water tank 24, a urea SCR catalyst unit 26, a concentration measurement unit 28, and a control unit 30, and an exhaust gas exhaust path. In other words, it is arranged inside the exhaust pipe 14 or in contact with the exhaust pipe 14.
- the oxidation catalyst 18 is a catalyst such as platinum provided in the exhaust gas exhaust path, specifically, in the exhaust pipe 14 in the downstream portion in the exhaust gas flow direction from the exhaust port of the diesel engine 12. Part of PM (Particulate Matter) is removed from the exhaust gas that has passed through the exhaust pipe 14 and passed through the oxidation catalyst 18.
- PM is an air pollutant discharged from a diesel engine, and includes solid carbon particles, unburned hydrocarbons made of polymer (soluble hydrocarbon: SOF, Soluble Organic Fraction), and sulfur contained in the fuel. It is a mixture such as sulfate produced by oxidation.
- the oxidation catalyst 18 oxidizes nitrogen monoxide contained in the exhaust gas flowing through the exhaust pipe 14 to nitrogen dioxide.
- a DPF (Diesel Particulate Filter) 20 is provided in the exhaust gas exhaust path, specifically, in the exhaust pipe 14 downstream of the oxidation catalyst 18 and contained in the exhaust gas that has passed through the oxidation catalyst 18. It is a filter that collects particulate matter. As the DPF 20, it is preferable to use a continuously regenerating DPF that regenerates the collected PM by removing it by combustion or the like and can maintain the collection performance.
- a urea SCR (Selective Catalytic Reduction) system 21 is a denitration system that reduces nitrogen oxides (NO, NO 2 ) contained in exhaust gas, and includes an injection unit 22, a urea water tank 24, a urea SCR catalyst unit 26, Have
- the injection means 22 is an injection device that injects urea water into the exhaust pipe 14, and an injection port is provided in a portion of the exhaust pipe 14 on the downstream side of the DPF 20.
- the injection means 22 injects urea water into the exhaust pipe 14 from the injection port.
- the urea water tank 24 is a tank for storing urea water, and supplies urea water to the injection means 22.
- the urea water tank 24 is provided with a replenishing port for replenishing urea water from a device for supplying external urea water, and urea water is replenished from the replenishing port as needed.
- the urea SCR catalyst means 26 includes a urea SCR catalyst that is a urea selective reduction catalyst that promotes a reaction between ammonia generated from urea and nitrogen oxides, and an internal portion of the exhaust pipe 14 that is downstream of the injection means 22. And a support mechanism for supporting the urea SCR catalyst.
- a vanadium catalyst or a zeolite catalyst can be used as the urea SCR catalyst.
- the support mechanism is disposed inside the exhaust pipe 14, has a hole for allowing exhaust gas to flow, and supports the urea SCR catalyst on the surface thereof.
- the urea SCR system 21 is configured as described above, and urea water is injected into the exhaust pipe 14 by the injection means 22.
- the injected urea water becomes ammonia (NH 3 ) due to heat in the exhaust pipe 14.
- ammonia is produced from urea water by the following chemical reaction. (NH 2 ) 2 CO + H 2 O ⁇ 2NH 3 + CO 2
- the generated ammonia flows in the exhaust pipe 14 together with the exhaust gas, and reaches the urea SCR catalyst means 26.
- a part of the urea water does not become ammonia but reaches the urea SCR catalyst means 26 as the urea water. Therefore, ammonia is also generated from the urea water by the above reaction in the urea SCR catalyst means 26.
- the ammonia that has reached the urea SCR catalyst means 26 reacts with nitrogen oxides contained in the exhaust gas, removes oxygen from the nitrogen oxides, and is reduced to nitrogen. Specifically, nitrogen oxides are reduced by the following chemical reaction. 4NH 3 + 4NO + O 2 ⁇ 4N 2 + 6H 2 O 4NH 3 + 2NO 2 + O 2 ⁇ 3N 2 + 6H 2 O
- the concentration measuring means 28 is disposed in the urea SCR catalyst means 26 in the exhaust gas exhaust path, that is, both the upstream face and the downstream face are in contact with the urea SCR catalyst means 26, and the inside of the urea SCR catalyst means 26. Measure the concentration of ammonia in the exhaust gas flowing through.
- the concentration measuring unit 28 includes a measuring unit main body 40, an optical fiber 42, a measuring cell 44, and a light receiving unit 46.
- the measuring means main body 40 has a light emitting means for emitting laser light in a wavelength region absorbed by ammonia, and a calculating means for calculating the concentration of ammonia from the signal. Receives the received signal.
- the optical fiber 42 guides the laser beam output from the measuring means main body 40 and makes it incident on the measuring cell 44.
- the measurement cell 44 is disposed in the urea SCR catalyst means 26, and an incident portion that makes the light emitted from the optical fiber 42 enter the inside of the measurement cell 44 and laser light that has passed through a predetermined path of the measurement cell 44. And an output unit for outputting.
- the light receiving unit 46 receives the laser light that passes through the measurement cell 44 and is output from the output unit, and outputs the intensity of the received laser light to the measuring means body 40 as a light reception signal.
- the concentration measuring means 28 is configured as described above, and the laser light output from the measuring means main body 40 is output from the output section after passing through a predetermined path in the measuring cell 44 from the optical fiber 42. At this time, if the exhaust gas in the measurement cell 44 contains ammonia, the laser light passing through the measurement cell 44 is absorbed. For this reason, the output of the laser beam reaching the output unit varies depending on the ammonia concentration in the exhaust gas.
- the light receiving unit 46 converts the laser light output from the output unit into a light reception signal and outputs the light reception signal to the measuring means body 40.
- the measuring means main body 40 compares the intensity of the output laser light with the intensity calculated from the received light signal, and calculates the ammonia concentration of the exhaust gas flowing in the measuring cell 44 from the decrease rate.
- the concentration measuring means 28 uses the TDLAS method (Tunable Diode Laser Absorption Spectroscopy), and measures based on the intensity of the output laser light and the received light signal detected by the light receiving unit 46.
- the ammonia concentration in the exhaust gas passing through a predetermined position in the cell 44, that is, the measurement position is calculated or measured.
- the measurement cell 44 may be formed of only the incident portion and the output portion with a material that transmits light, or the entire measurement cell 44 may be formed with a material that transmits light.
- at least two optical mirrors may be provided in the measurement cell 44, and the laser light incident from the incident part may be reflected by the optical mirror and then output from the output part.
- the multiple reflection of the laser light allows a larger area in the measurement cell 44 to pass. As a result, the influence of the concentration distribution on the exhaust gas flowing in the measurement cell 44 can be reduced, and the concentration can be accurately detected.
- the control means 30 controls the amount of urea water injected from the injection means 22 and the injection timing based on the detection result of the concentration measurement means 28. Specifically, when the ammonia concentration is lower than a predetermined value, the amount of urea water injected at a time is increased, or the interval at which urea water is injected is shortened. Further, when the ammonia concentration is higher than a predetermined value, the amount of urea water to be injected at a time is decreased, or the interval for injecting urea water is increased.
- the vehicle 10 and the exhaust gas purification device 16 are basically configured as described above.
- the exhaust gas discharged from the diesel engine 12 passes through the oxidation catalyst 18 and the DPF 20, whereby PM contained in the exhaust gas is collected, and PM in the exhaust gas is reduced.
- the exhaust gas that has passed through the DPF 20 flows through the exhaust pipe 14, and after urea water is injected from the injection means 22, it passes through the urea SCR catalyst means 26 together with urea water and ammonia generated from the urea water.
- the exhaust gas passes through the urea SCR catalyst means 26 together with ammonia, so that nitrogen oxides contained in the exhaust gas are reduced by the urea SCR system 21. Thereafter, the exhaust gas is discharged from the exhaust pipe 14 into the atmosphere.
- the exhaust gas purification device 16 measures the ammonia concentration of the exhaust gas passing through a predetermined position of the urea SCR catalyst means 26 by the concentration measuring means 28, and the injection means 22 injects the fuel based on the measurement result.
- the amount of urea water and the injection timing are controlled.
- the vehicle 10 can reduce PM of exhaust gas discharged from the diesel engine 12 by the exhaust gas purification device 16 (for diesel engine), reduce nitrogen oxides, and reduce harmful substances. It can be discharged in a state.
- the exhaust gas purification device 16 measures the ammonia concentration in the urea SCR catalyst means 26 and controls the injection amount of urea water according to the result.
- the injection amount of urea water can be controlled in accordance with the reaction state of ammonia and nitrogen oxides. it can.
- the reaction state of ammonia and nitrogen oxides rather than measuring upstream from the urea SCR catalyst means 26, the reaction state of ammonia and nitrogen oxides, the proportion of ammonia adsorbed on the urea SCR catalyst means 26, etc. can be accurately grasped. Can do. Further, when measuring downstream of the urea SCR catalyst means 26, ammonia is leaking out at the time when ammonia is measured, so it is impossible to prevent ammonia from leaking out. By measuring the ammonia concentration in the means 26, ammonia and nitrogen oxide can be reacted even downstream from the measurement point, and ammonia can be adsorbed to the urea SCR catalyst. Therefore, even if ammonia is detected at the measurement position. It is possible to suppress the leakage of ammonia downstream from the urea SCR catalyst.
- the urea SCR catalyst means 26 changes the reaction amount between nitrogen oxides and ammonia and the adsorption rate of ammonia due to a plurality of factors such as temperature and concentration. Even if the injection amount is controlled, there is a possibility that ammonia will increase and ammonia will leak, or there will be less ammonia and nitrogen oxides cannot be reduced and nitrogen oxides will leak. However, ammonia at the measurement position in the urea SCR catalyst By measuring the concentration, it is possible to control the injection amount of the urea water more appropriately.
- an oxidation catalyst that oxidizes ammonia is provided downstream of the urea SCR catalyst means 26 so that ammonia does not leak into the atmosphere from the exhaust pipe 14. It can be made smaller or need not be provided. Thereby, the apparatus configuration of the exhaust gas purification apparatus can be further simplified, and the weight can be reduced. Furthermore, nitrogen oxides generated by oxidizing ammonia can be reduced or eliminated. As described above, the exhaust gas purification device 16 can suppress the leakage of ammonia, but oxidizes ammonia downstream of the urea SCR catalyst means 26 in order to further reduce the ammonia leaking into the atmosphere. It is preferable to provide an oxidation catalyst. Even if an oxidation catalyst is provided, the exhaust gas purification device 16 for diesel engines can reduce the amount of ammonia leaking out as described above, so that the oxidation catalyst can be made smaller than before, and Further, less nitrogen oxide can be generated.
- the target value of the ammonia concentration can be absorbed by the urea SCR catalyst unit 26 downstream of the concentration measuring unit 28 even when the ammonia concentration is a value having a buffer, that is, the ammonia concentration is higher than the target value.
- the state value that is, when the ammonia concentration is the target value
- the concentration measuring means 28 is the nitrogen in the exhaust gas in the state where the urea SCR catalyst is disposed in the urea SCR catalyst in the flow direction of the exhaust gas in the region where the urea SCR catalyst of the urea SCR catalyst means 26 is disposed.
- the nitrogen oxide concentration at the maximum load of the diesel engine is the concentration at the inlet of the urea SCR catalyst at the minimum load of the diesel engine or at the inlet of the urea SCR catalyst at the maximum load of the internal combustion engine.
- the theoretical nitrogen oxide concentration that can be denitrated (that is, reduced) at an ammonia concentration of 10 ppm is a state where ammonia is not adsorbed on the urea SCR catalyst and the ammonia concentration in the exhaust gas (air) is 10 ppm. This is the concentration of nitrogen oxides that can be denitrated.
- the nitrogen oxide concentration at the maximum load of the diesel engine is the urea SCR catalyst at the minimum load of the diesel engine.
- FIG. 3 is a graph showing the relationship between the length from the inlet of the urea SCR catalyst and the nitrogen oxide concentration.
- the horizontal axis is the length from the inlet of the urea SCR catalyst, and the vertical axis is the nitrogen oxide concentration.
- FIG. 3 also shows the reduction of nitrogen oxides in the exhaust gas with the maximum load, that is, with the highest concentration of nitrogen oxides discharged from the diesel engine and the excessive addition of ammonia into the urea SCR catalyst. The result of having calculated the nitrogen oxide density
- urea in the case of reducing nitrogen oxides in exhaust gas with a minimum load, that is, exhausting nitrogen oxides from the diesel engine at the lowest concentration and excessively adding ammonia into the urea SCR catalyst
- L3 is the length from the inlet to the outlet of the urea SCR catalyst, that is, the total length.
- CN1 is the theoretical nitrogen oxide concentration that can be denitrated when the ammonia concentration is 10 ppm
- CN2 is the nitrogen oxide concentration at the urea SCR catalyst inlet at the minimum load
- CN3 is the maximum It is the nitrogen oxide concentration at the urea SCR catalyst inlet at the time of loading.
- the nitrogen oxide concentration at the maximum load of the diesel engine is the minimum of the diesel engine.
- L2 is the position where the nitrogen oxide concentration at the maximum load of the diesel engine is the theoretical nitrogen oxide concentration that can be denitrated at an ammonia concentration of 10 ppm.
- the concentration measuring means 28 is preferably disposed between L1 and L2. In addition, the specific value of each of these values changes with apparatuses.
- the ammonia concentration between the position L1 and L2 in FIG. The ratio of adsorption to the catalyst and the reaction state of nitrogen oxide and ammonia can be grasped more accurately, and the urea SCR catalyst means 26 can have an appropriate buffer. Furthermore, since the ammonia concentration in the exhaust gas in which a certain amount of unreacted ammonia remains can be measured, the ammonia concentration that can be easily measured can be set as the target value. In the example shown in FIG. 3, CN2 is the concentration of nitrogen oxides at the urea SCR catalyst inlet at the minimum load.
- CN2 is the concentration at the inlet of the urea SCR catalyst at the maximum load. In some cases, the concentration may be half of that.
- L1 is the urea SCR when the nitrogen oxide concentration at the maximum load of the diesel engine is reduced when the nitrogen oxide in the exhaust gas is reduced in a state where ammonia is excessively charged into the urea SCR catalyst. The position is half the concentration at the catalyst inlet. Thus, even when the concentration at half the concentration at the inlet of the urea SCR catalyst at the maximum load is used as a reference, the same effect as described above can be obtained.
- CN2 is preferably a higher concentration of the two reference concentrations as described above, and as L1, urea SCR catalyst means 26 is selected from the two positions as described above. It is preferable to set the position closer to the entrance of the.
- the higher concentration of the nitrogen oxide concentration at the inlet of the urea SCR catalyst at the minimum load or the concentration at half the concentration at the inlet of the urea SCR catalyst at the maximum load, whichever is higher, as the reference Even when the nitrogen oxide concentration at the urea SCR catalyst inlet is extremely low, the ammonia concentration can be appropriately detected between L1 and L2.
- the control means 30 preferably controls the injection of urea water by the injection means 22 so that the ammonia concentration at an arbitrary position (hereinafter also referred to as “reference position”) is within a predetermined range.
- the concentration measuring means 28 measures the concentration at the reference position in the area where the urea SCR catalyst of the urea SCR catalyst means 26 is arranged, and based on the measurement result, the control means 30 performs the injection means 22.
- the present invention is not limited to this, and even if the ammonia concentration at the position upstream of the reference position is measured, the ammonia concentration at the position downstream of the reference position is not limited to this. May be measured. As described above, when the point at which the ammonia concentration is measured is different from the reference position, the ammonia concentration at the reference position may be calculated based on the separation distance. Further, the relationship between the ammonia concentration at the position where the ammonia concentration is measured and the ammonia concentration at the reference position may be obtained in advance by experiments.
- control means 30 is based on the measurement result of the concentration measurement means 28, and the nitrogen oxide concentration between L1 and L2 in the region where the urea SCR catalyst of the urea SCR catalyst means 26 is disposed is It is preferable to adjust the urea injection amount so that it is not less than CN1 and not more than CN2.
- control means 30 has a nitrogen oxide concentration at the measurement position equal to or higher than the theoretical nitrogen oxide concentration that can be denitrated with an ammonia concentration of 10 ppm, and nitrogen oxide at the inlet of the urea SCR catalyst at the minimum load.
- the reference value or reference range of the ammonia concentration at the measurement position it is preferable to set the reference value or reference range of the ammonia concentration at the measurement position so that the concentration or the concentration at half maximum of the concentration at the inlet of the urea SCR catalyst at the maximum load, whichever is higher. . Furthermore, it is more preferable to set the reference value or reference range of the ammonia concentration at the measurement position so that the nitrogen oxide concentration at each position is within the range of the hatched area in FIG. Specifically, the nitrogen oxide concentration between L1 and L2 at the measurement position is CN1 or more and CN2 or less, and the nitrogen oxide concentration at each position is the minimum load and excessive ammonia is contained in the urea SCR catalyst.
- the nitrogen oxide concentration at each position of the urea SCR catalyst is calculated by simulation so that the reference value of the ammonia concentration at the measurement position or It is more preferable to set a reference range.
- the concentration of L1 and CN2 is the concentration at the inlet of the urea SCR catalyst at the maximum load.
- the positions of L1 and CN2 are different positions. Even in this case, only the positions of L1 and CN2 are different from each other in FIG. 3, and the definitions of the other ranges are the same.
- control means 30 may change the target value of the ammonia concentration at the measurement position according to operating conditions such as the accelerator opening, the speed, the engine speed, etc., or may be constant regardless of the operating conditions.
- the injection amount of urea water can be controlled in accordance with the increase or decrease of the amount of nitrogen oxides contained in the exhaust gas, and the nitrogen oxides are more appropriately reduced.
- the ammonia concentration at the measurement position can be maintained at a value close to the target value. The same applies to the case where the target value is kept constant and the injection amount and the injection timing of the urea water are controlled from the relationship between the target value and the operating conditions.
- the control is simplified.
- PM is collected by the oxidation catalyst 18 and the DPF 20, and the PM in the exhaust gas is reduced.
- the present invention is not limited to this.
- Various types of particulate matter reducing devices that reduce PM can be used as exhaust gas purification devices for diesel engines.
- only a filter that collects PM may be disposed without providing an oxidation catalyst. .
- the ammonia concentration is measured by the TDLAS method in which the concentration measuring means 28 outputs a laser beam in a wavelength range that is absorbed by ammonia and detects the absorption ratio of the laser beam, but is not limited thereto.
- concentration measuring means 28 outputs a laser beam in a wavelength range that is absorbed by ammonia and detects the absorption ratio of the laser beam, but is not limited thereto.
- Various measuring means that can measure the ammonia concentration in the exhaust gas can be used.
- a branch pipe may be provided at the measurement position so that part of the exhaust gas also flows through the branch pipe, and the ammonia concentration of the exhaust gas flowing through the branch pipe may be measured.
- one urea SCR catalyst means 26 is provided, and the concentration measuring means 28 is provided in the urea SCR catalyst means 26, that is, between the urea SCR catalyst means 26, but the present invention is limited to this. Not.
- another embodiment of the exhaust gas purifying apparatus for a diesel engine according to the present invention will be described with reference to FIG.
- FIG. 4 is a block diagram showing a schematic configuration of another embodiment of a vehicle having the exhaust gas purifying apparatus of the present invention.
- the vehicle 50 shown in FIG. 4 is the same as the vehicle 10 except for the configuration of the urea SCR system 54 of the exhaust gas purification device 52, and therefore, the description of the same components is omitted.
- the point peculiar to 50 will be explained mainly.
- a vehicle 50 shown in FIG. 4 includes a diesel engine 12, an exhaust pipe 14, and an exhaust gas purification device 52.
- the exhaust gas purifying device 52 (for diesel engine) includes an oxidation catalyst 18, a DPF 20, an injection unit 22, a urea water tank 24, a urea SCR catalyst unit 56, a concentration measuring unit 64, and a control unit 30. Since the oxidation catalyst 18, the DPF 20, the injection unit 22, the urea water tank 24, and the control unit 30 have the same configuration as each part of the exhaust gas purification device 16 described above, detailed description thereof is omitted.
- the urea SCR catalyst means 56 includes a first catalyst 58, a connection pipe 60, and a second catalyst 62.
- the first catalyst 58 and the second catalyst 62 are respectively a urea SCR catalyst that is a urea selective reduction catalyst that promotes a reaction between ammonia generated from urea and nitrogen oxide, and a support mechanism that supports the urea SCR catalyst. It is configured.
- As the urea SCR catalyst of the first catalyst 58 and the second catalyst 62 the same catalyst or different catalysts may be used.
- the connection pipe 60 is a pipe disposed between the first catalyst 58 and the second catalyst 62 and guides the exhaust gas that has passed through the first catalyst 58 to the second catalyst 62.
- the concentration measuring means 64 is installed in the connection pipe 60 and measures the ammonia concentration of the exhaust gas flowing in the connection pipe 60.
- the concentration measuring unit 64 is the same as the above-described concentration measuring unit 28 except for the arrangement, and thus detailed description thereof is omitted.
- the exhaust gas purification device 52 is configured as described above, and the exhaust gas discharged from the diesel engine 12 flows through the exhaust pipe 14 and passes through the oxidation catalyst 18 and the DPF 20 to reduce PM. Thereafter, the exhaust gas further flows through the exhaust pipe 14 and after the urea water is injected by the injection means 22, passes through the first catalyst 58, passes through the connection pipe 60, and passes through the second catalyst 62.
- the exhaust gas passes through the first catalyst 58 and the second catalyst 62, nitrogen oxides contained in the exhaust gas react with ammonia generated from the urea water, and the nitrogen oxides are reduced.
- the exhaust gas that has passed through the second catalyst 62 is discharged from the exhaust pipe 14 to the atmosphere.
- the urea SCR catalyst means of the urea SCR catalyst means is divided into a plurality of catalysts and the catalysts are connected by piping, the catalysts are arranged on both the upstream side and the downstream side in the exhaust gas flow direction.
- the concentration of the ammonia at the position is measured by the concentration measuring means, and the urea water injection by the injection means is controlled based on the measurement result, so that the urea water is in line with the reaction state of ammonia and nitrogen oxides.
- the injection amount can be controlled. As shown in FIG.
- the concentration measurement arranged in the connecting pipe is made such that the position passing through the first catalyst passes through the region of the length L1 or more and L2 or less in the exhaust gas flow direction in the SCR catalyst.
- the ammonia concentration of the exhaust gas at a suitable position can be measured by means. Thereby, the reaction state of nitrogen oxide and ammonia can be grasped more accurately, and the urea SCR catalyst means can have an appropriate buffer.
- ammonia is generated by injecting urea water by the injection means, but the present invention is not limited to this.
- ammonia can be supplied to the urea SCR catalyst (SCR catalyst), for example, gaseous ammonia may be directly injected, or ammonia water may be supplied.
- 5 to 8 are graphs showing examples of measurement results.
- gaseous ammonia was supplied instead of urea water, and a 30 kW engine for power generation manufactured by Mitsubishi Heavy Industries, Ltd. was used as the internal combustion engine.
- the ammonia concentration measuring means measured the ammonia concentration at a position where it moved to a quarter from the upstream side of the SCR catalyst, that is, 25% downstream from the upstream side.
- the flow rate of the exhaust gas discharged from the engine is reduced, and a certain amount of air (air that is not exhaust gas) is separately mixed.
- the treatment conditions with the SCR catalyst change.
- the amount of ammonia introduced was adjusted based on the measurement result of the ammonia concentration measuring means arranged at a quarter from the upstream side of the SCR catalyst.
- the control target value is variable according to the conditions, and the control is performed so that the target value is set in advance based on the conditions.
- the conditions of the exhaust gas passing through the exhaust gas purification device are changed, the amount of ammonia input, the ammonia concentration at the measurement position (measurement result by the measuring means), the temperature at the inlet of the SCR catalyst, the outlet of the SCR catalyst ( The nitrogen oxide concentration and ammonia concentration of the exhaust gas discharged from the exhaust gas purification device) were measured.
- the measurement results are shown in FIG.
- the horizontal axis represents the elapsed time [hour, h] from the start of treatment
- the vertical axis represents the nitrogen oxide concentration (NOx concentration) [ppm], the ammonia concentration (NH 3 concentration) [ppm], and the SCR.
- the temperature at the inlet of the catalyst [° C.] and the input amount of ammonia (NH 3 ) [ ⁇ 100 NL / min] were used.
- the flow rate of exhaust gas from the engine was 41 Nm 3 / h for 30 minutes immediately after the start (elapsed time 0 h to elapsed time 0:30 h), 1 hour (the elapsed time 0: elapsed time from 30h 1: 30h) during flows exhaust gas flow rate is 24 Nm 3 / h next to the engine, the added air flow of 45 Nm 3 / h, and the exhaust gas purifying apparatus air the flow rate is 69 nm 3 / h, and the subsequent 1 hour (the elapsed time 1: 30h elapsed time since 2: 30h) between the flow rate of the exhaust gas from the engine becomes 43Nm 3 / h.
- mapping data is associated with the input amount of ammonia at which the concentration of nitrogen oxides discharged from the exhaust gas purifying apparatus in a steady state is 5 to 10 ppm in the operation condition.
- the measurement results are shown in FIG.
- the vertical axis and the horizontal axis of the graph shown in FIG. 6 are the same as those of the graph shown in FIG.
- the flow rate of exhaust gas from the engine was 43 Nm 3 / h for 30 minutes immediately after the start (elapsed time 0 h to elapsed time 0:30 h), During 1 hour (elapsed time 0: 30h to elapsed time 1: 30h), the flow rate of the exhaust gas from the engine is 26 Nm 3 / h, and the flow rate of the added air (air mixed with the exhaust gas, not the exhaust gas) is 45 Nm.
- the input amount can be adjusted based only on the mapping data of the relationship between the operating state and the input amount.
- leakage of nitrogen oxide can be reduced while suppressing leakage of ammonia.
- the catalyst temperature is also decreased, ammonia is not easily used for the NOx reduction reaction, and is easily adsorbed on the catalyst, and when the exhaust gas temperature is rapidly increased, The catalyst temperature also rises, and it becomes possible to compensate for the catalyst characteristics that ammonia adsorbed on the catalyst is released. Further, as shown in FIG.
- the ammonia concentration can be measured at a certain concentration or more. That is, since ammonia having a higher concentration than that near the outlet is a measurement target, a change in value is easily detected, and measurement can be performed easily.
- FIG. 7 shows the measurement results when the control is performed based on the ammonia concentration measuring means
- FIG. 8 shows the measurement results when the control is performed based on the mapping data for comparison.
- shaft and horizontal axis of the graph shown to FIG.7 and FIG.8 are the same as that of the graph shown in FIG.
- the flow rate of exhaust gas from the engine was 43 Nm 3 / h for 20 minutes immediately after the start (elapsed time 0 h to elapsed time 0:20 h), 5 minutes (the elapsed time 0: elapsed time since 20h 0: 25h) during flows flow of the exhaust gas from the engine 26 nm 3 / h, and the flow rate of the additional air is 45 Nm 3 / h, and the exhaust gas purifying apparatus air the flow rate is 71 nm 3 / h, and the subsequent 5 minutes (the elapsed time 0: elapsed time since 25h 0: 30h) between the flow rate of the exhaust gas from the engine becomes 45 Nm 3 / h.
- the input amount can be adjusted based only on the mapping data of the relationship between the operating state and the input amount.
- leakage of nitrogen oxide can be reduced while suppressing leakage of ammonia.
- ammonia leaks from the outlet when the conditions are switched, but in the measurement example shown in FIG. 7, leakage of ammonia can be suppressed. Thereby, the leakage amount of ammonia can be reduced without increasing the amount of nitrogen oxides leaking from the outlet.
- the catalyst temperature is also decreased, ammonia is not easily used for the NOx reduction reaction, and is easily adsorbed on the catalyst, and when the exhaust gas temperature is rapidly increased, It is possible to compensate for the characteristic of the catalyst that the catalyst temperature also rises and ammonia adsorbed on the catalyst is released.
- the ammonia concentration can be measured at a certain concentration or more at the point where the ammonia concentration is measured. That is, since ammonia having a higher concentration than that near the outlet is a measurement target, a change in value is easily detected, and measurement can be performed easily.
- the exhaust gas purifying apparatus is useful for purifying exhaust gas discharged from an internal combustion engine, and is particularly suitable for purifying exhaust gas discharged from a diesel engine mounted on a vehicle.
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Abstract
Description
(NH2)2CO+H2O→2NH3+CO2
その後、生成されたアンモニアは、排ガスとともに排気配管14内を流れ、尿素SCR触媒手段26に到達する。なお、尿素水の一部は、アンモニアにならずに、尿素水のまま尿素SCR触媒手段26に到達する。そのため、尿素SCR触媒手段26内でも、上記反応により、尿素水からアンモニアが生成される。尿素SCR触媒手段26に到達したアンモニアは、排ガスに含まれる窒素酸化物と反応し、窒素酸化物から酸素を取り除き、窒素に還元する。具体的には、以下の化学反応により、窒素酸化物が還元される。
4NH3+4NO+O2→4N2+6H2O
4NH3+2NO2+O2→3N2+6H2O
12 ディーゼルエンジン
14 排気配管
16、52 排ガス浄化装置
18 酸化触媒
20 DPF
21、54 尿素SCRシステム
22 噴射手段
24 尿素水タンク
26、56 尿素SCR触媒手段
28、64 濃度計測手段
30 制御手段
40 計測手段本体
42 光ファイバ
44 計測セル
46 受光部
58 第1触媒
60 接続配管
62 第2触媒
Claims (6)
- 内燃機関から排出される排ガスに含まれる窒素酸化物を還元する排ガス浄化装置であって、
前記内燃機関から排出される排ガスを案内する排気配管と、
前記排気配管内にアンモニアを供給するアンモニア供給手段と、
供給されたアンモニアと前記窒素酸化物との反応を促進させるSCR触媒及び前記排気配管の内部に配置され前記SCR触媒を前記排気配管の内部に支持する支持機構とを備え、前記排ガスの流れ方向において前記アンモニアが供給される位置よりも下流側に配置されている触媒手段と、
前記触媒手段が配置されている領域内の測定位置における排ガス中のアンモニアの濃度を計測するアンモニア濃度計測手段と、
前記アンモニア濃度計測手段の計測結果に基づいて前記アンモニア供給手段によるアンモニアの供給を制御する噴射制御手段と、を有することを特徴とする排ガス浄化装置。 - 内燃機関から排出される排ガスに含まれる窒素酸化物を還元する排ガス浄化装置であって、
前記内燃機関から排出される排ガスを案内する排気配管と、
前記排気配管内に尿素水を噴射する尿素水噴射手段と、
噴射された尿素水から生成されるアンモニアと前記窒素酸化物との反応を促進させる尿素SCR触媒及び前記排気配管の内部に配置され前記尿素SCR触媒を前記排気配管の内部に支持する支持機構とを備え、前記排ガスの流れ方向において前記尿素水が噴射される位置よりも下流側に配置されている触媒手段と、
前記触媒手段が配置されている領域内の測定位置における排ガス中のアンモニアの濃度を計測するアンモニア濃度計測手段と、
前記アンモニア濃度計測手段の計測結果に基づいて前記尿素水噴射手段による尿素水の噴射を制御する噴射制御手段と、を有することを特徴とする排ガス浄化装置。 - 前記アンモニア濃度計測手段は、前記触媒手段の前記尿素SCR触媒が配置されている領域のうち、排ガスの流れ方向において、前記尿素SCR触媒内にアンモニアを過剰に投入した状態で排ガス中の窒素酸化物を還元させた場合に前記内燃機関の最大負荷時の窒素酸化物濃度が、前記内燃機関の最小負荷時での前記尿素SCR触媒の入口の濃度または前記内燃機関の最大負荷時の前記尿素SCR触媒の入口での濃度の半分の濃度のうち、いずれか高い方の濃度となる位置から、前記内燃機関の最大負荷時の窒素酸化物濃度がアンモニア濃度10ppmで脱硝可能な理論上の窒素酸化物濃度となる位置、までの領域に含まれる位置の前記排ガスのアンモニア濃度を検出することを特徴とする請求項2に記載の排ガス浄化装置。
- 前記触媒手段は、前記尿素SCR触媒が、第1触媒及び前記第1触媒よりも前記排ガスの流れ方向において下流側に配置された第2触媒で構成され、さらに、前記第1触媒と前記第2触媒とを接続する接続配管を備え、
前記アンモニア濃度計測手段は、前記接続配管に配置され、
前記測定位置は、前記接続配管内にあることを特徴とする請求項2に記載の排ガス浄化装置。 - さらに、前記尿素水噴射手段と前記内燃機関との間に配置され、前記排ガスに含まれる粒子状物質を低減する粒子状物質低減装置を有することを特徴とする請求項2から4のいずれか1項に記載の排ガス浄化装置。
- さらに、前記測定位置における排ガス中の窒素酸化物の濃度を計測する窒素酸化物濃度計測手段を有することを特徴とする請求項1から5のいずれか1項に記載の排ガス浄化装置。
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US13/133,588 US20110252771A1 (en) | 2008-12-08 | 2009-12-08 | Flue gas purifying device |
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- 2009-12-08 CA CA2745511A patent/CA2745511A1/en not_active Abandoned
- 2009-12-08 WO PCT/JP2009/070564 patent/WO2010067805A1/ja active Application Filing
- 2009-12-08 CN CN2009801375539A patent/CN102165154A/zh active Pending
- 2009-12-08 JP JP2010542112A patent/JPWO2010067805A1/ja active Pending
- 2009-12-08 EP EP09831909A patent/EP2357332A1/en not_active Withdrawn
- 2009-12-08 RU RU2011122628/06A patent/RU2011122628A/ru not_active Application Discontinuation
- 2009-12-08 US US13/133,588 patent/US20110252771A1/en not_active Abandoned
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JP2002332827A (ja) * | 2001-05-09 | 2002-11-22 | Nissan Diesel Motor Co Ltd | 内燃機関の排気浄化装置 |
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Cited By (3)
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JP2013537846A (ja) * | 2010-09-13 | 2013-10-07 | ユミコア・アクチエンゲゼルシャフト・ウント・コムパニー・コマンディットゲゼルシャフト | ディーゼルエンジンの排ガスから窒素酸化物を除去するための触媒 |
JP2012189007A (ja) * | 2011-03-10 | 2012-10-04 | Honda Motor Co Ltd | 内燃機関の排気浄化システム |
JP2012215154A (ja) * | 2011-04-01 | 2012-11-08 | Honda Motor Co Ltd | 内燃機関の排気浄化システム |
Also Published As
Publication number | Publication date |
---|---|
EP2357332A1 (en) | 2011-08-17 |
RU2011122628A (ru) | 2012-12-10 |
US20110252771A1 (en) | 2011-10-20 |
CA2745511A1 (en) | 2010-06-17 |
JPWO2010067805A1 (ja) | 2012-05-17 |
CN102165154A (zh) | 2011-08-24 |
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