WO2013161423A1 - 排ガス処理装置、排ガス処理システム、排ガス処理システムの制御方法、制御プログラム、及び筒状管 - Google Patents
排ガス処理装置、排ガス処理システム、排ガス処理システムの制御方法、制御プログラム、及び筒状管 Download PDFInfo
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- WO2013161423A1 WO2013161423A1 PCT/JP2013/057195 JP2013057195W WO2013161423A1 WO 2013161423 A1 WO2013161423 A1 WO 2013161423A1 JP 2013057195 W JP2013057195 W JP 2013057195W WO 2013161423 A1 WO2013161423 A1 WO 2013161423A1
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- exhaust gas
- cylindrical tube
- engine
- frequency power
- power source
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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
- F01N3/24—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 constructional aspects of converting apparatus
- F01N3/26—Construction of thermal reactors
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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
- F01N3/0892—Electric or magnetic treatment, e.g. dissociation of noxious components
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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
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
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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
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/0205—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust using heat exchangers
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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
- F01N9/00—Electrical control of exhaust gas treating apparatus
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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
- F01N2560/026—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
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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
- F01N2560/05—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a particulate sensor
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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
- F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
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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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/08—Parameters used for exhaust control or diagnosing said parameters being related to the engine
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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
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
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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
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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
- Y02T10/40—Engine management systems
Definitions
- the present invention relates to an exhaust gas treatment device, an exhaust gas treatment system, a control method for an exhaust gas treatment system, a control program, and a cylindrical tube for purifying exhaust gas discharged from an engine.
- urea SCR Selective A Catalytic Reduction
- the urea SCR system injects urea water (ammonia, NH3) into the generated NOx, and reduces NOx emission by reducing NOx to nitrogen (N2) and water (H2O) by the reaction.
- urea water ammonia, NH3
- a diesel particulate filter (DPF) system As a method for reducing PM, a diesel particulate filter (DPF) system is known.
- the DPF system is composed of a porous filter having a catalyst, and collects PM with a filter when exhaust gas passes, thereby reducing the amount of PM discharged.
- Patent Document 1 describes a purification device using barrier discharge plasma.
- a capacitive coupling method represented by parallel plate electrodes and a microwave method in which plasma is excited by irradiating a gas to a gas are conceivable. Is difficult and is not suitable for exhaust gas treatment of engines.
- An object of the present invention is to provide an exhaust gas treatment device, an exhaust gas treatment system, a control method for an exhaust gas treatment system, a control program, and a cylindrical tube that can stably maintain high purification performance.
- an exhaust gas treatment apparatus of the present invention includes a cylindrical tube through which exhaust gas from an engine passes, and a coil antenna provided on the outer periphery of the cylindrical tube and connected to a high-frequency power source. A device is provided.
- the exhaust gas treatment system of the present invention is provided on a cylindrical tube through which the exhaust gas of the engine passes, a high frequency power source, and an outer periphery of the cylindrical tube, and the high frequency power source is connected thereto.
- an exhaust gas treatment system having a coil antenna, a sensor for detecting information on exhaust gas discharged from the engine, and a control unit for controlling output power of the high-frequency power source based on the detected information.
- the gas processing system control method of the present invention is provided with a cylindrical tube through which exhaust gas from the engine passes, a high-frequency power source, an outer periphery of the cylindrical tube, and the high-frequency power source
- the present invention provides a control method for an exhaust gas treatment system, comprising a step of detecting, and a step of controlling the output power of the high frequency power source based on the detected information by the control unit.
- a control program for executing the control method of the exhaust gas treatment system of the present invention includes a cylindrical tube through which engine exhaust gas passes, a high-frequency power source, and an outer periphery of the cylindrical tube.
- a control program for an exhaust gas treatment system comprising: a coil antenna that is provided and connected to the high-frequency power source; a sensor that detects information relating to exhaust gas discharged from the engine; and a control unit, wherein the sensor is from the engine
- the present invention provides a control program that executes a step of detecting information about exhaust gas to be discharged and a step of controlling the output power of the high-frequency power source based on the detected information.
- the cylindrical tube of the present invention is a cylindrical tube provided with a coil antenna on the outer periphery, and the cylindrical tube has an exhaust gas passage through which engine exhaust gas passes. And a cylindrical tube having a coolant channel provided on the outer periphery of the exhaust gas passage.
- an exhaust gas treatment device an exhaust gas treatment system, a control method for an exhaust gas treatment system, a control program, and a cylindrical tube that can maintain high purification performance more stably.
- FIG. 1 is used to explain an exhaust gas treatment system 100 according to an embodiment of the present invention.
- FIG. 1 is an explanatory diagram schematically illustrating an exhaust gas treatment system.
- the exhaust gas treatment system 100 is connected to an engine 101 mounted on an automobile.
- the engine 101 is a diesel engine.
- the engine 101 discharges exhaust gas containing NOx and PM during operation.
- An exhaust gas treatment device 103 that purifies exhaust gas is connected to the downstream of the engine 101 via a first pipe 102.
- An exhaust port 106 is provided downstream of the exhaust gas treatment apparatus 103, that is, downstream of the first pipe via a second pipe 104 and a DPF 105.
- the exhaust gas treatment device 103 is provided between the first pipe 102 and the second pipe 104. Details of the exhaust gas treatment device 103 will be described later.
- the exhaust gas treatment system 100 includes an exhaust gas treatment device 103, a control unit 107, and a sensor 108.
- the control unit 107 receives information detected by the sensor 108 and controls the exhaust gas treatment device 103 based on the information.
- the control unit 107 includes a memory 202, and the memory 202 stores a program for controlling the exhaust gas treatment device 103.
- the memory 202 has a function of storing data received from the sensor 108.
- the control unit 107 has a CPU (Central (Processing Unit) 201 is built-in.
- the CPU 201 controls the exhaust gas treatment device 103 according to data received from the sensor 108 and a program in the memory 202.
- the program is configured to be rewritable, and may be changed according to the operating state of the engine 101 or the automobile, the external environment, or the like. Further, it may be updated using a terminal such as a personal computer at the time of software version upgrade or control initialization.
- the control unit 107 may be an automobile control unit or a dedicated control unit for an exhaust gas treatment system.
- the sensor 108 detects various information of the automobile, and particularly detects information related to exhaust gas discharged from the engine 101.
- the sensor 108 has the following sensors, for example. That is, an air suction amount sensor 301 that detects the amount of air sucked into the engine 101, a temperature detection sensor 302 that detects the temperature of a cylindrical body 401 included in an exhaust gas treatment device 103 described later, and the NOx concentration of exhaust gas discharged from the engine 101 A NOx concentration detection sensor 303 for detecting (or amount) and a PM concentration detection sensor 304 for detecting PM concentration (or amount) of exhaust gas discharged from the engine 101 are provided. Data detected by the sensor 108 is stored in the memory 202 of the control unit 107. Each sensor may use what was previously mounted in the car, or may be newly mounted.
- FIG. 4A is a schematic view of an exhaust gas treatment apparatus
- FIG. 4B is a cross-sectional view of (A)-(A ′) in FIG.
- a coil 411 described later is omitted.
- the exhaust gas treatment device 103 has a cylindrical tube 401 made of quartz. As shown in FIG. 4B, the tubular tube 401 has an exhaust gas passage 403 through which the exhaust gas of the engine 101 passes and a coolant channel 405 provided on the outer periphery of the exhaust gas passage 403. Specifically, the exhaust gas passage 403 surrounded by the inner wall 402 and a coolant channel 405 as a temperature control unit provided between the inner wall 402 and the outer wall 404 are mainly configured.
- the coolant channel 405 is configured on a surface facing a coil 411 described later.
- the coolant channel 405 is provided with a coolant supply hole 406 for supplying the coolant and a coolant discharge hole 407 for discharging the coolant.
- the coolant 420 is supplied to the coolant channel 405 from the coolant supply hole 406, and the coolant 420 supplied to the coolant channel 405 is discharged from the discharge hole 407.
- the coolant discharge hole 407 is connected to a coolant supply source described later via a pipe (not shown).
- the coolant 420 is supplied from a coolant supply source (for example, an electric pump) 421 to the coolant supply hole 406 via a coolant supply pipe 422.
- the coolant supply pipe 422 is provided with a coolant supply source 421, a flow rate controller (mass flow controller) 423, and a valve 424 from the upstream.
- the control unit 107 controls the flow rate control unit 423 and the valve 424 to control the amount of coolant supplied to the coolant supply hole 406.
- a refrigerant typified by Galden or the like is used as a chiller.
- the coolant channel 405, the coolant supply hole 406, and the coolant discharge hole 407 are mainly referred to as a temperature control unit, but the coolant supply source 421, the coolant supply pipe 422, the flow rate control unit 423, All or any of the valves 424 may be included as the temperature control unit.
- the inside of the tubular tube 401 that is, the exhaust gas passage 403 is formed in a cylindrical shape by the inner wall 402.
- resistance at the contact surface between the inner wall 402 and the exhaust gas 430 becomes uniform, so that it is possible to prevent stagnation in the exhaust gas passage 403 when the exhaust gas 430 is supplied. This suppresses NOx and PM contained in the exhaust gas 430 from remaining in the exhaust gas passage 403.
- the exhaust gas passage 403 is configured to communicate the first pipe 102 and the second pipe 104. In this way, the exhaust gas 430 can be reliably supplied from the engine 101 to the exhaust gas treatment device 103, and further, the gas purified by the exhaust gas treatment device 103 can be supplied to the exhaust port 106 via the second pipe 104. Can be reliably supplied.
- a coil (coil antenna) 411 to which a high frequency power source 412 is connected is provided on the outer periphery of the outer wall 404 of the tubular tube 401.
- the coil 411 is provided on the side surface (outer periphery) of the tubular tube 401 so as to surround the outer wall 404.
- the high frequency power supply 412 is connected to the control unit 107 and a battery (not shown) mounted on the automobile.
- the high frequency power supply 412 converts the direct current supplied from the battery into a predetermined high frequency, amplifies it, and outputs it.
- the high-frequency power source 412 includes a variable amplifier and can adjust output power.
- the control unit 107 performs control so that a high frequency is applied from the high frequency power source 412 to the coil 411.
- so-called inductively coupled plasma is generated.
- Inductively coupled plasma can be stably generated even at atmospheric pressure. Therefore, stable plasma can be generated even in a traveling automobile.
- the exhaust gas 430 is in a plasma state due to a high voltage applied by the coil 411 to which a high frequency is applied. Furthermore, an eddy current is generated inside the plasma by a high-frequency fluctuating magnetic field, generating Joule heat. In this way, high-temperature exhaust gas plasma is generated in the exhaust gas passage 403. NOx contained in the exhaust gas in the plasma state is decomposed into N (nitrogen) and O (oxygen) and recombined with oxygen and nitrogen as shown in Equation 1. The decomposed nitrogen and oxygen are exhausted from the exhaust port 106. (Formula 1) 2NOx ⁇ xO2 + N2 On the other hand, PM contained in the exhaust gas 430 is burned by high-temperature plasma. In this way, the exhaust gas 430 is purified.
- a cylindrical body temperature sensor 302 is provided on the surface of the outer wall 404 of the cylindrical tube 401 and in a region that receives the magnetic field of the coil 411. As described above, when plasma is generated, eddy current is generated by the magnetic field of the coil 411, and Joule heat is generated. Therefore, the region affected by the magnetic field of the coil 411 has the highest temperature. Therefore, a coolant channel 405 is provided on the surface facing the coil 411.
- a cylindrical body temperature sensor 302 for determining whether or not the temperature inside the cylindrical body is appropriately controlled by the coolant channel 405 is provided on the outer wall 404.
- the cylindrical body temperature sensor 302 is provided between the coil end 411a and the coil end 411b of the coil 411.
- the coil end portion 411 a and the coil end portion 411 b refer to portions that are separated from the outer wall 404 of the cylindrical body 401.
- N and O recombine when the mixed atmosphere becomes 550 ° C. or higher. Therefore, when the temperature of the exhaust gas 430 passing through the cylindrical tube 401 becomes 550 ° C. or higher, there is a concern that the decomposed N and O are recombined and restored to NOx again. On the other hand, it is known that PM is burned at 350 ° C. or higher.
- the temperature of the exhaust gas 430 is controlled so that the exhaust gas 430 becomes 350 ° C. or higher and lower than 550 ° C.
- the exhaust gas 430 may be controlled to be 350 ° C. or higher and 650 ° C. or lower.
- control unit 107 controls the flow rate control unit 423 and the valve 424 to control the supply amount of the coolant supplied to the coolant supply hole 406.
- the temperature of the exhaust gas 430 is controlled within the aforementioned range.
- ⁇ Plasma excitation step> When the engine 101 is started, the control unit 107 introduces electric power into the coil 411 and applies a high frequency. As a result, the exhaust gas 430 supplied to the exhaust gas passage 403 is excited into a plasma state.
- the introduction of electric power to the coil 411 may be started before the engine 101 is started (for example, when the ignition switch is operated to a predetermined position).
- ⁇ Supply power adjustment step> When the plasma is excited, the air suction amount sensor 301 detects the amount of air sucked into the engine 101. The detected information is temporarily stored in the memory 202 of the control unit 107. Here, since the air suction amount and the exhaust gas amount are in a proportional relationship, the exhaust gas amount can be calculated by detecting the air suction amount with the air suction amount sensor 301. The control unit 107 determines the output power of the high frequency power source 412 based on the calculated exhaust gas amount.
- the detection values of the NOx concentration detection sensor 303 and the PM concentration detection sensor 304 may be taken into consideration to calculate the high frequency power.
- the throttle opening or the flow rate of the exhaust gas itself may be detected. That is, the sensor 108 is not limited to the sensor shown in FIG. 3 as long as it detects information regarding the exhaust gas discharged from the engine 101. Then, the control unit 107 determines the output power of the high-frequency power source 412 based on information (one information or a combination of a plurality of information) detected by the sensor 108.
- the CPU 201 of the control unit 107 determines the high-frequency power applied to the coil 411 according to the detection value stored in the memory 202.
- the start of the supply power adjustment step is not limited to when the plasma is excited, and may be executed at an appropriate timing before and after the introduction of power to the coil 411.
- the output power of the high-frequency power source 412 is controlled according to the air suction amount, that is, according to the amount of the exhaust gas 430. In this way, even if the amount of the exhaust gas 430 increases, high-density plasma can be generated. That is, the exhaust gas 430 can be decomposed with high efficiency.
- the output power of the high frequency power source corresponding to the amount is calculated, and the high frequency power is applied to the coil. Specifically, the output power of the high-frequency power source 412 is increased as the amount of exhaust gas increases.
- the air suction amount (exhaust gas amount) and the high frequency power have an appropriate relationship in advance through experiments or the like, and the output power of the high frequency power source 412 is controlled based on the relationship.
- An appropriate relationship is a relationship in which exhaust gas is decomposed with high efficiency. If the detected air suction amount (exhaust gas amount) has an appropriate relationship with the current high-frequency power, the power supply level is maintained. Thus, since the high frequency power is applied according to the amount of the exhaust gas, the exhaust gas can be always decomposed with high efficiency.
- ⁇ Coolant supply step> The coolant is supplied to the coolant passage 405 through the coolant supply hole 406 by controlling the flow rate control unit 423 and the valve 424. In this way, the plasma of the exhaust gas 430 is maintained in a predetermined temperature range. Specifically, the temperature is controlled to 350 ° C. or higher at which PM is burned and 550 ° C. or lower which is lower than the temperature at which NOx is recombined.
- the temperature sensor 302 detects the temperature of the exhaust gas 430 (the outer wall 404 (plasma decomposition unit wall) of the tubular tube 401), and determines whether the temperature value is equal to or lower than a predetermined value.
- the temperature is not less than the predetermined value, that is, when a temperature value higher than the predetermined value is detected, the flow rate control unit 423 and the valve 424 are controlled to increase the coolant supply amount in order to reduce the temperature of the exhaust gas 430. If the detected temperature is equal to or lower than a predetermined value, the coolant supply amount is maintained.
- the PM is burned and maintained at a temperature at which the decomposed N and O are not recombined, the amounts of NOx and PM can be reduced.
- the present invention is not limited to this, and any material that can pass an electric field and can withstand a high temperature state may be used.
- the electric power introduced into the coil is controlled according to the air suction amount.
- the present invention is not limited to this, and it is controlled according to information indicating the engine load such as exhaust gas concentration, temperature, and acceleration. You may do it.
- it is desirable to measure the amount of exhaust gas more accurately and control according to the measured value, and information that is proportional to the amount of exhaust gas, such as the air suction amount, is more desirable. .
- the engine 101 is a diesel engine. However, a gasoline engine or an engine using LP gas or the like as fuel may be used. Moreover, although the engine 101 was mounted in the motor vehicle, it is not restricted to it, The engine used as power sources other than motor vehicles, such as a ship, a construction machine, a generator, may be sufficient. Further, the engine 101, the DPF 105, and the like can be configured as a part of the exhaust gas processing system 100 to constitute an integrated exhaust gas purification processing system including control of the engine 101 and PM collection by the PDF 105.
- An exhaust gas treatment apparatus comprising a cylindrical tube through which exhaust gas from an engine passes, and a coil antenna provided on an outer periphery of the cylindrical tube and connected to a high frequency power source.
- the cylindrical pipe has a first pipe connected upstream thereof, a second pipe connected downstream thereof, and communicated with the first pipe and the second pipe.
- the exhaust gas treatment apparatus according to any one of the above. Thereby, exhaust gas can be reliably supplied from the engine to the exhaust gas treatment device, and further, gas purified by the exhaust gas treatment device can be reliably supplied to the exhaust port via the second pipe.
- the exhaust gas treatment apparatus according to any one of appendices 1 to 4, comprising: the high-frequency power source; and a control unit that controls an output of the high-frequency power source based on information related to the exhaust gas discharged from the engine.
- An exhaust gas treatment system comprising: a control unit that controls output power of the high-frequency power source based on the detected information.
- ⁇ Appendix 7> A cylindrical tube through which the exhaust gas of the engine passes, a high-frequency power source, a coil antenna provided on the outer periphery of the cylindrical tube and connected to the high-frequency power source, and a sensor for detecting information on the exhaust gas discharged from the engine
- a control method for an exhaust gas treatment system wherein the sensor detects information about exhaust gas discharged from the engine, and the control unit detects the information on the high-frequency power source based on the detected information.
- a control method for an exhaust gas treatment system As a result, it is possible to control the exhaust gas treatment according to the information on the exhaust gas discharged from the engine, so that an efficient exhaust gas treatment system that can operate with high efficiency and stably maintain high purification performance is provided. Is possible.
- ⁇ Appendix 8> A cylindrical tube through which the exhaust gas of the engine passes, a high-frequency power source, a coil antenna provided on the outer periphery of the cylindrical tube and connected to the high-frequency power source, and a sensor for detecting information on the exhaust gas discharged from the engine
- a control program for an exhaust gas treatment system having a control unit, wherein the sensor detects information about the exhaust gas discharged from the engine, and the control unit detects the information on the high-frequency power source based on the detected information.
- a control program for executing the step of controlling the output power As a result, it is possible to control the exhaust gas treatment according to the information related to the exhaust gas discharged from the engine, so that a highly efficient operation is possible and a control program that stably maintains high purification performance is provided. It is possible.
- a cylindrical tube provided with a coil antenna on the outer periphery, the cylindrical tube having an exhaust gas passage through which exhaust gas from an engine passes and a coolant channel provided on the outer periphery of the exhaust gas passage Tube.
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
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Abstract
Description
Matter、PM)が含まれることが知られている。
Catalytic Reduction)システムが知られている。
尿素SCRシステムは、発生したNOxに尿素水(アンモニア、NH3)を噴射し、その反応によってNOxを窒素(N2)と水(H2O)に還元することで、NOxの排出量を低減する。
DPFシステムは触媒を有する多孔性フィルタで構成され、排ガスが通過する際にPMをフィルタで捕集することでPMの排出量を低減する。
しかしながら、バリア放電により生成されるプラズマは局所的で不安定な状態であり、プラズマを生成する電極間に排ガスが流れても、排ガスを均一なプラズマ状態とすることが困難である。従って、高い浄化性能を得ることは困難である。
特許文献1には、バリア放電プラズマを用いた浄化装置が記載されている。
制御部107は図2に記載のようにメモリ202を含み、メモリ202には排ガス処理装置103を制御するためのプログラムが格納されている。また、メモリ202はセンサ108から受信したデータなどを保存する機能を有する。更には、制御部107にはCPU(Central
Processing Unit)201が内蔵されている。CPU201は、センサ108から受信したデータやメモリ202内のプログラムに従って、排ガス処理装置103を制御する。
制御部107は、自動車の制御部でも良いし、排ガス処理システム専用の制御部としても良い。
センサ108は、自動車の様々な情報を検知するものであり、特に、エンジン101から排出される排ガスに関する情報を検知するものである。センサ108は、例えば次のセンサを有している。
即ち、エンジン101への空気吸引量を検知する空気吸引量センサ301、後述する排ガス処理装置103が有する筒状体401の温度を検知する温度検知センサ302、エンジン101から排出される排ガスのNOx濃度(あるいは量)を検知するNOx濃度検知センサ303、エンジン101から排出される排ガスのPM濃度(あるいは量)を検知するPM濃度検知センサ304を有する。
センサ108で検知されたデータは、制御部107のメモリ202に格納される。
それぞれのセンサは、予め自動車に搭載されているものを利用しても良いし、新たに搭載しても良い。
排ガス通路403に排ガス430が流れている状態においては、制御部107が高周波電源412からコイル411に高周波を印加する様制御する。このような構造により、所謂誘導結合プラズマ(Inductively Coupled Plasma)を生成する。誘導結合プラズマは、大気圧でも安定して生成可能である。従って、走行中の自動車においても安定したプラズマが生成可能である。
プラズマ状態となった排ガスに含まれるNOxは、N(窒素)とO(酸素)に分解され、式1のように酸素と窒素に再結合される。分解された窒素と酸素は、排気口106から排気される。
(式1)2NOx → xO2 + N2
一方、排ガス430に含まれるPMは、高温状態のプラズマによって燃焼される。
このようにして、排ガス430が浄化される。
前述のように、プラズマを生成する際、コイル411の磁場により渦電流が発生し、ジュール熱が発生する。そのため、コイル411の磁場の影響を受ける領域が最も高い温度となる。そのため、コイル411と対向する面に冷却剤流路405が設けられている。
具体的には、コイル411のコイル端部411aとコイル端部411bの間に筒状体温度センサ302を設ける。ここで、コイル端部411a、コイル端部411bとは、筒状体401の外壁404から離間する部分を言う。
筒状体温度センサ302で外壁404の温度を検出することで、排ガス通路403の温度、即ち排ガス430の温度を間接的に検出する。
なお、筒状体温度センサ302を排ガス通路403や内壁402に設け、排ガス430の温度を直接的に検出してもよい。
一方、PMは350℃以上で燃焼されることが知られている。
排ガス430に含まれるNOxやPMの濃度によっては、350℃以上650℃以下となるように制御しても良い。
<エンジン起動ステップ>
自動車の使用者の指示により、自動車の制御部はエンジン101を起動する。
エンジン101が起動したら、制御部107はコイル411に電力を導入し、高周波を印加する。これにより、排ガス通路403に供給された排ガス430をプラズマ状態に励起する。なお、コイル411への電力の導入は、エンジン101の起動前(例えばイグニッションスイッチが所定の位置まで操作されたとき)から開始してもよい。
プラズマが励起されると、空気吸引量センサ301はエンジン101に吸引される空気量を検出する。検出した情報は制御部107のメモリ202に一旦格納する。
ここで、空気吸引量と排ガス量は比例関係にあるので、空気吸引量センサ301で空気吸入量を検知することで、排ガス量を算出することができる。制御部107は、この算出した排ガス量に基づき、高周波電源412の出力電力を決定する。
なお、空気吸引量センサ301の検出値に加え、NOx濃度検知センサ303やPM濃度検知センサ304の検出値、エンジン101や自動車のその他の運転状態(燃料噴射量、空燃比、速度、加速度(負荷)、エンジン回転数等)も勘案して高周波電力を算出するようにしてもよい。また、空気吸引量の検知に代え、スロットル開度や排ガスそのものの流量を検知するようにしてもよい。
すなわち、センサ108は、エンジン101から排出される排ガスに関する情報を検知するものであれば、図3に示したセンサに限られるものではない。そして、制御部107は、センサ108によって検知された情報(1つの情報、あるいは、複数の情報の組合せ)に基づき、高周波電源412の出力電力を決定する。
なお、この供給電力調整ステップの開始は、プラズマが励起されたときに限られるものではなく、コイル411への電力の導入前後の適宜なタイミングで実行してもよい。
そこで、本実施例においては、空気吸引量に応じて、即ち排ガス430の量に応じて高周波電源412の出力電力を制御する。このようにすることで、排ガス430の量が増えたとしても、高密度のプラズマを生成することができる。即ち、排ガス430を高い効率で分解することができる。
本ステップの場合、排ガス430の量が多いと判断されたら、それに応じた高周波電源の出力電力を算出し、その高周波電力をコイルへ印加する。具体的には、排ガス量が多くなるに従い、高周波電源412の出力電力を増加させる。
検出された空気吸引量(排ガス量)が、現在の高周波電力と適切な関係であれば電力供給レベルを維持する。
このように、排ガスの量に応じて高周波電力を印加するので、常に高い効率で排ガスを分解することができる。
流量制御部423、バルブ424を制御して、冷却剤供給孔406を介して冷却剤通路405に冷却材を供給する。このようにして、排ガス430のプラズマを所定の温度範囲に維持する。具体的には、PMが燃焼される350℃以上であって、NOxが再結合する温度より低い550℃以下に制御する。
検出温度が所定の値以下であれば、冷却材供給量を維持する。
このように、PMが燃焼し、更に分解されたNとOが再結合することの無い温度に維持しているので、NOxとPMの量を低減することが可能である。
更には、自動車の置かれた状況に応じて電力や冷媒量を調整するので、効率的な電力運用が可能となる。従って、自動車のような限られた蓄電容量を有する場合において特に有効である。
また、エンジン101は自動車に搭載されるようにしたが、それに限られるものではなく、船舶や建設機械、発電機等、自動車以外の動力源として使用されるエンジンであってもよい。
また、エンジン101やDPF105等も排ガス処理システム100の一部として、エンジン101の制御やPDF105によるPM捕集も含めた統合的な排ガス浄化処理システムを構成することもできる。
エンジンの排ガスが通過する筒状管と、前記筒状管の外周に設けられると共に高周波電源が接続されたコイルアンテナとを有する排ガス処理装置。
これにより、安定して高い浄化性能を維持する排ガス処理装置を提供することが可能である。
前記筒状管には、前記筒状管内の雰囲気温度を制御する温度制御部が設けられた付記1記載の排ガス処理装置。
これにより、PMが燃焼し、更に分解されたNとOが再結合することの無い温度により維持することができるので、NOxとPMの量を低減することが可能である。
前記排ガスは少なくとも粒子状物質とNOxを含み、前記温度制御部は、前記筒状管内の排ガスの温度を350℃以上650℃以下となるよう制御する付記2記載の排ガス処理装置。
これにより、PMが燃焼し、更に分解されたNとOが再結合することの無い温度により確実に維持することができるので、NOxとPMの量をより確実に低減することが可能である。
前記筒状管は、その上流に第一の配管が接続されると共に、その下流に第二の配管が接続され、前記第一の配管と前記第二の配管と連通される付記1から3のいずれかに記載の排ガス処理装置。
これにより、排ガスをエンジンから排ガス処理装置へ確実に供給することができ、更には排ガス処理装置で浄化されたガスを第二の配管を介して、排気口へ確実に供給することができる。
前記高周波電源と、前記エンジンから排出される排ガスに関する情報に基づいて前記高周波電源の出力を制御する制御部とを有する付記1から4のいずれかに記載の排ガス処理装置。
これにより、エンジンから排出される排ガスに関する情報に応じて排ガス処理を制御することが可能であるため、高効率な運用が可能であり、且つ安定して高い浄化性能を維持する排ガス処理システムを提供することが可能である。
エンジンの排ガスが通過する筒状管と、高周波電源と、前記筒状管の外周に設けられると共に前記高周波電源が接続されたコイルアンテナと、前記エンジンから排出される排ガスに関する情報を検知するセンサと、前記検知された情報に基づいて前記高周波電源の出力電力を制御する制御部とを有する排ガス処理システム。
これにより、エンジンから排出される排ガスに関する情報に応じて排ガス処理を制御することが可能であるため、高効率な運用が可能であり、且つ安定して高い浄化性能を維持する排ガス処理システムを提供することが可能である。
エンジンの排ガスが通過する筒状管と、高周波電源と、前記筒状管の外周に設けられると共に前記高周波電源が接続されたコイルアンテナと、前記エンジンから排出される排ガスに関する情報を検知するセンサと、制御部とを有する排ガス処理システムの制御方法であって、前記センサが前記エンジンから排出される排ガスに関する情報を検知するステップと、前記制御部が前記検知された情報に基づいて前記高周波電源の出力電力を制御するステップとを有する排ガス処理システムの制御方法。
これにより、エンジンから排出される排ガスに関する情報に応じて排ガス処理を制御することが可能であるため、高効率な運用が可能であり、且つ安定して高い浄化性能を維持する排ガス処理システムを提供することが可能である。
エンジンの排ガスが通過する筒状管と、高周波電源と、前記筒状管の外周に設けられると共に前記高周波電源が接続されたコイルアンテナと、前記エンジンから排出される排ガスに関する情報を検知するセンサと、制御部とを有する排ガス処理システムの制御プログラムであって、前記センサが前記エンジンから排出される排ガスに関する情報を検知するステップと、前記制御部が前記検知された情報に基づいて前記高周波電源の出力電力を制御するステップとを実行させる制御プログラム。
これにより、エンジンから排出される排ガスに関する情報に応じて排ガス処理を制御することが可能であるため、高効率な運用が可能であり、且つ安定して高い浄化性能を維持する制御プログラムを提供することが可能である。
外周にコイルアンテナが設けられる筒状管であって、前記筒状管は、内部に、エンジンの排ガスが通過する排ガス通路と、前記排ガス通路の外周に設けられた冷却剤流路とを有する筒状管。
これにより、安定して高い浄化性能を維持する排ガス処理装置に用いられる筒状管を提供することが可能である。
103 排ガス処理装置
107 制御部
108 センサ
401 筒状管
403 排ガス通路
405 冷却剤流路
411 コイル(コイルアンテナ)
412 高周波電源
Claims (9)
- エンジンの排ガスが通過する筒状管と、
前記筒状管の外周に設けられると共に高周波電源が接続されたコイルアンテナと
を有することを特徴とする排ガス処理装置。 - 前記筒状管に前記筒状管内の雰囲気温度を制御する温度制御部が設けられたことを特徴とする請求項1記載の排ガス処理装置。
- 前記排ガスは少なくとも粒子状物質とNOxを含み、前記温度制御部は、前記筒状管内の排ガスの温度を350℃以上650℃以下となるよう制御することを特徴とする請求項2記載の排ガス処理装置。
- 前記筒状管は、その上流に第一の配管が接続されると共に、その下流に第二の配管が接続され、前記第一の配管と前記第二の配管と連通されることを特徴とする請求項1から3のいずれかに記載の排ガス処理装置。
- 前記高周波電源と、
前記エンジンから排出される排ガスに関する情報に基づいて前記高周波電源の出力を制御する制御部と
を有することを特徴とする請求項1から4のいずれかに記載の排ガス処理装置。 - エンジンの排ガスが通過する筒状管と、
高周波電源と、
前記筒状管の外周に設けられると共に前記高周波電源が接続されたコイルアンテナと、
前記エンジンから排出される排ガスに関する情報を検知するセンサと、
前記検知された情報に基づいて前記高周波電源の出力電力を制御する制御部と
を有する排ガス処理システム。 - エンジンの排ガスが通過する筒状管と、高周波電源と、前記筒状管の外周に設けられると共に前記高周波電源が接続されたコイルアンテナと、前記エンジンから排出される排ガスに関する情報を検知するセンサと、制御部とを有する排ガス処理システムの制御方法であって、
前記センサが前記エンジンから排出される排ガスに関する情報を検知するステップと、
前記制御部が前記検知された情報に基づいて前記高周波電源の出力電力を制御するステップと
を有する排ガス処理システムの制御方法。 - エンジンの排ガスが通過する筒状管と、高周波電源と、前記筒状管の外周に設けられると共に前記高周波電源が接続されたコイルアンテナと、前記エンジンから排出される排ガスに関する情報を検知するセンサと、制御部とを有する排ガス処理システムの制御プログラムであって、
前記センサが前記エンジンから排出される排ガスに関する情報を検知するステップと、
前記制御部が前記検知された情報に基づいて前記高周波電源の出力電力を制御するステップと
を実行させる制御プログラム。 - 外周にコイルアンテナが設けられる筒状管であって、前記筒状管は、内部に、
エンジンの排ガスが通過する排ガス通路と、
前記排ガス通路の外周に設けられた冷却剤流路とを有することを特徴とする筒状管。
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CN201380018492.0A CN104220709A (zh) | 2012-04-26 | 2013-03-14 | 废气处理装置、废气处理系统、废气处理系统的控制方法、控制程序及筒状管 |
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US10526944B2 (en) | 2016-09-28 | 2020-01-07 | Fujitsu Limited | Filter regeneration device, filter plugging detection device, exhaust gas treatment apparatus, and filter plugging determination method |
CN110043347A (zh) * | 2018-01-15 | 2019-07-23 | 东北林业大学 | 电感耦合等离子体木纤维滤芯柴油车尾气净化器 |
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