WO2014016909A1 - 排気浄化装置、液体還元剤又はその前駆体の解凍方法 - Google Patents
排気浄化装置、液体還元剤又はその前駆体の解凍方法 Download PDFInfo
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- WO2014016909A1 WO2014016909A1 PCT/JP2012/068723 JP2012068723W WO2014016909A1 WO 2014016909 A1 WO2014016909 A1 WO 2014016909A1 JP 2012068723 W JP2012068723 W JP 2012068723W WO 2014016909 A1 WO2014016909 A1 WO 2014016909A1
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- Prior art keywords
- exhaust
- tank
- reducing agent
- precursor
- exhaust gas
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- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 43
- 239000007788 liquid Substances 0.000 title claims abstract description 30
- 239000002243 precursor Substances 0.000 title claims abstract description 30
- 238000000746 purification Methods 0.000 title claims abstract description 17
- 238000010257 thawing Methods 0.000 title claims description 15
- 238000000034 method Methods 0.000 title claims description 11
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000007789 gas Substances 0.000 claims abstract description 50
- 239000003054 catalyst Substances 0.000 claims abstract description 10
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 52
- 239000004202 carbamide Substances 0.000 claims description 52
- 238000002156 mixing Methods 0.000 claims description 20
- 230000003197 catalytic effect Effects 0.000 claims description 13
- 230000003647 oxidation Effects 0.000 claims description 11
- 238000007254 oxidation reaction Methods 0.000 claims description 11
- 239000000243 solution Substances 0.000 claims description 9
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 238000011144 upstream manufacturing Methods 0.000 claims description 7
- 239000013618 particulate matter Substances 0.000 claims description 6
- 230000000903 blocking effect Effects 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims 1
- 239000007921 spray Substances 0.000 abstract 1
- 239000007864 aqueous solution Substances 0.000 description 42
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 16
- 238000007710 freezing Methods 0.000 description 10
- 230000008014 freezing Effects 0.000 description 10
- 229910021529 ammonia Inorganic materials 0.000 description 8
- 230000008929 regeneration Effects 0.000 description 5
- 238000011069 regeneration method Methods 0.000 description 5
- 239000000498 cooling water Substances 0.000 description 4
- 238000006722 reduction reaction Methods 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000004887 air purification Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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- 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
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
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- F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy
- F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy the devices using heat
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- 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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- 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
- F01N3/033—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 in combination with other devices
- F01N3/035—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 in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
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- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
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- F01N3/105—General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
- F01N3/106—Auxiliary oxidation catalysts
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- 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]
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- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
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- 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
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- F01N3/2066—Selective catalytic reduction [SCR]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
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- F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
- F01N2240/02—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a heat exchanger
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- F01N2270/00—Mixing air with exhaust gases
- F01N2270/02—Mixing air with exhaust gases for cooling exhaust gases or the apparatus
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- F01N2410/00—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device
- F01N2410/06—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device at cold starting
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- F01N2610/00—Adding substances to exhaust gases
- F01N2610/01—Adding substances to exhaust gases the substance being catalytic material in liquid form
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- F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
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- F01N2610/105—Control thereof
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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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 purification device that selectively reduces and purifies nitrogen oxide (NOx) in exhaust gas, and a method for thawing a liquid reducing agent or a precursor thereof used in the exhaust purification device.
- NOx nitrogen oxide
- Patent Document 1 As an exhaust gas purification system that purifies NOx contained in engine exhaust, an exhaust gas purification device as described in JP 2012-13060 A (Patent Document 1) has been proposed.
- This exhaust purification device injects a urea aqueous solution according to the engine operating condition upstream of the exhaust of a selective catalytic reduction (SCR) converter (SCR) disposed in the exhaust pipe of the engine, and generates ammonia by hydrolysis.
- SCR selective catalytic reduction
- the temperature of the engine cooling water is low.
- the temperature of the engine cooling water rises slowly. It was difficult to thaw in a short time.
- an object of the present invention is to provide a technique capable of thawing a liquid reducing agent or a precursor thereof in a short time even immediately after a cold start.
- the exhaust purification device includes a reduction catalytic converter that reduces and purifies NOx in exhaust gas, a tank that stores a liquid reducing agent or a precursor thereof, and a liquid reducing agent stored in the tank or a precursor thereof upstream of the reduction catalytic converter. And a bypass pipe for bypassing a part of the exhaust gas flowing through the exhaust pipe to the tank and exchanging heat with the liquid reducing agent or its precursor stored in the tank.
- the method of thawing the liquid reducing agent or its precursor is a method for reducing the amount of exhaust flowing through the exhaust pipe through a tank for storing the liquid reducing agent or its precursor that is injected upstream of the reduction catalytic converter that reduces and purifies NOx in the exhaust.
- the liquid reducing agent or its precursor heated in part and frozen in the tank is thawed.
- the liquid reducing agent or its precursor can be thawed in a short time even immediately after a cold start.
- FIG. 1 shows an example of an exhaust purification device that purifies particulate matter (PM) and NOx in exhaust gas.
- An intake pipe 14 connected to the intake manifold 12 of the diesel engine 10 includes an air cleaner 16 that filters dust and the like in the intake air along a direction of intake air flow, a compressor 18A of a turbocharger 18 that supercharges intake air, and a turbocharger 18.
- An intercooler 20 that cools the intake air that has passed through is disposed in this order.
- an exhaust pipe 24 connected to the exhaust manifold 22 of the diesel engine 10 includes a turbine 18B of a turbocharger 18 and a continuous regeneration type diesel particulate filter (DPF) device 26 along the exhaust circulation direction.
- the injection nozzle 28 for injecting the urea aqueous solution, the SCR converter 30 for selectively reducing and purifying NOx using ammonia generated by hydrolyzing the urea aqueous solution, and the oxidation catalytic converter 32 for oxidizing the ammonia that has passed through the SCR converter 30 are in this order. Arranged.
- the continuous regeneration type DPF device 26 includes a diesel oxidation catalyst (DOC) converter 26A that oxidizes at least nitric oxide (NO) into nitrogen dioxide (NO 2 ), a DPF 26B that removes PM in the exhaust, It is comprised including.
- DOC diesel oxidation catalyst
- DPF 26B that removes PM in the exhaust, It is comprised including.
- CSF Catalyzed Soot Filter
- the urea aqueous solution is an example of a precursor of a liquid reducing agent.
- the aqueous urea solution stored in a metal tank 34 such as stainless steel is supplied to the injection nozzle 28 via a reducing agent addition unit 36 having a built-in pump and flow control valve.
- the reducing agent addition unit 36 may be divided into two parts: a pump module with a built-in pump and a dosing module with a built-in flow control valve.
- the diesel engine 10 is provided with an exhaust gas recirculation (EGR) device 38 that reduces NOx by lowering the combustion temperature by introducing a part of the exhaust gas into the intake air and recirculating it.
- the EGR device 38 includes an EGR pipe 38A that introduces part of the exhaust gas flowing through the exhaust pipe 24 into the intake pipe 14, an EGR cooler 38B that cools the exhaust gas that flows through the EGR pipe 38A, and EGR of the exhaust gas that is introduced into the intake pipe 14. And an EGR control valve 38C for controlling the rate.
- EGR exhaust gas recirculation
- the outside air mixing device 42 controls the ratio of the outside air to be mixed with the exhaust gas by increasing or decreasing the opening area (opening degree) at the connection portion of the outside air introduction pipe 44 for introducing outside air.
- the outside air mixing device 42 does not need to divert the exhaust to the tank 34 when the urea aqueous solution stored in the tank 34 is not frozen. Has the function of blocking. Therefore, an exhaust return pipe 46 that directly returns the exhaust gas to the exhaust pipe 24 without diverting the exhaust gas that has passed through the oxidation catalytic converter 32 to the tank 34 is connected to the outside air mixing device 42.
- the bypass pipe 40 is not limited to the exhaust gas downstream of the oxidation catalyst converter 32, but is located between the exhaust pipe 24, the SRC converter 30, and the oxidation catalyst converter 32 positioned between the continuous regeneration DPF device 26 and the injection nozzle 28. A part of the exhaust may be taken out from the exhaust pipe 24 or the like located. In this case, the exhaust gas detoured to the tank 34 is returned to the position of the exhaust pipe 24 corresponding to the purification state of the exhaust gas.
- the intermediate portion of the bypass pipe 40 contacts at least a part of the outer peripheral surface of the tank 34 so as to exchange heat between the exhaust gas flowing through the bypass pipe 40 and the urea aqueous solution stored in the tank 34.
- the detour pipe 40 at the portion that contacts the tank 34 is bent a plurality of times as shown in FIG.
- a metal sheet 48 that promotes heat transfer between the tank 34 and the bypass pipe 40 may be interposed.
- a heat sink (not shown) may be formed on the metal sheet 48.
- the detour pipe 40 has a certain degree of strength because it forms a part of the exhaust system. For this reason, as shown in FIG. 3, the detour pipe 40 can also form at least a part of a bracket 50 for attaching the tank 34 to a vehicle body (not shown). In this way, the bracket 50 for attaching the tank 34 to the vehicle body can be simplified, so that the weight can be reduced.
- the bracket structure for attaching the tank 34 to the vehicle body directly fixes an attachment member 54 for detachably attaching a strap 52 for fixing the tank 34 to the bypass pipe 40, or FIG.
- the detour tube 40 may be fitted into a recessed groove formed around the tank 34.
- the elastic member 56 made of may be wound.
- An exhaust temperature sensor 58 for detecting the exhaust temperature (exhaust temperature) Te is attached to the exhaust pipe 24 positioned between the continuous regeneration type DPF device 26 and the injection nozzle 28.
- a reducing agent temperature sensor 60 that detects the temperature Tu of the aqueous urea solution stored in the tank 34 is attached to the tank 34.
- an outside air temperature sensor 62 that detects an outside air temperature (outside air temperature) To is attached to a predetermined portion of the vehicle.
- a rotational speed sensor 64 for detecting the rotational speed Ne and a load sensor 66 for detecting the load Q are respectively attached to predetermined locations of the diesel engine 10.
- torque, fuel injection amount, supercharging pressure, accelerator opening, throttle opening, and the like can be used.
- the outside air temperature To, the rotational speed Ne, and the load Q are not limited to the configuration directly read from each sensor, but from various control units such as an engine control unit connected via an in-vehicle network such as CAN (Controller Area Network). You may make it read.
- CAN Controller Area Network
- the output signals of the exhaust temperature sensor 58, the reducing agent temperature sensor 60, the outside air temperature sensor 62, the rotation speed sensor 64, and the load sensor 66 are input to a control unit 68 incorporating a computer, respectively.
- the control unit 68 executes a control program stored in a non-volatile memory such as a flash ROM (Read Only Memory), so that the reducing agent addition unit 36 corresponds to the exhaust temperature Te, the rotational speed Ne, and the load Q.
- the pump and flow control valve are electronically controlled.
- the control unit 68 executes the control program to electronically control the outside air mixing device 42 according to the exhaust temperature Te, the reducing agent temperature Tu, and the outside air temperature To.
- the exhaust temperature Te, the rotational speed Ne, and the load Q are listed as examples of the engine operating state.
- exhaust gas from the diesel engine 10 is introduced into the DOC converter 26A of the continuous regeneration type DPF device 26 through the exhaust manifold 22 and the turbine 18B of the turbocharger 18.
- Exhaust introduced into the DOC converter 26A flows to DPF26B being oxidized NO is to NO 2.
- DPF 26B PM in the exhaust gas is removed and PM is continuously oxidized (incinerated) using NO 2 generated by the DOC converter 26A.
- the urea aqueous solution injected from the injection nozzle 28 according to the engine operating state is hydrolyzed using exhaust heat and water vapor in the exhaust, and converted into ammonia that functions as a reducing agent.
- This ammonia is known to be selectively reduced with NOx in the exhaust gas in the SCR converter 30 and purified to harmless H 2 O (water) and N 2 (nitrogen).
- NO is oxidized to NO 2 by the DOC converter 26A, and the ratio of NO and NO 2 in the exhaust approaches a ratio suitable for the selective reduction reaction, so that the NOx purification rate in the SCR converter 30 can be improved. it can.
- the ammonia that has passed through the SCR converter 30 is oxidized by the oxidation catalytic converter 32 disposed downstream of the exhaust gas, so that it is possible to suppress the ammonia from being released into the atmosphere as it is.
- FIG. 6 shows an example of a control program that the control unit 68 repeatedly executes every predetermined time when the diesel engine 10 is started.
- step 1 abbreviated as “S1” in the figure, the same applies hereinafter
- the control unit 68 reads the temperature Tu of the urea aqueous solution from the reducing agent temperature sensor 60.
- the control unit 68 determines whether or not the temperature Tu of the urea aqueous solution is equal to or lower than the freezing determination temperature.
- the freezing determination temperature is a threshold value for determining whether or not the urea aqueous solution stored in the tank 34 may be frozen, for example, the freezing point when the concentration is 32.5%.
- the temperature is slightly higher than -11 ° C.
- the control unit 68 advances the process to step 3 if the temperature Tu of the aqueous urea solution is equal to or lower than the freezing determination temperature (Yes), and proceeds to step 8 if the temperature Tu of the aqueous urea solution is higher than the freezing determination temperature. Advance (No).
- step 3 the control unit 68 determines whether or not the urea solution in the tank 34 has been sucked by the reducing agent addition unit 36.
- whether or not the urea aqueous solution has been sucked can be determined by, for example, the discharge pressure of a pump built in the reducing agent addition unit 36.
- the control unit 68 advances the process to step 4 if the urea aqueous solution cannot be sucked (Yes), and advances the process to step 8 if the urea aqueous solution can be sucked (No).
- step 4 the control unit 68 reads the exhaust temperature Te from the exhaust temperature sensor 58.
- step 5 the control unit 68 reads the outside air temperature To from the outside air temperature sensor 62.
- the control unit 68 refers to the map in which the operation amount according to the exhaust temperature and the outside air temperature is set, and calculates the operation amount of the outside air mixing device 42 according to the exhaust temperature Te and the outside air temperature To.
- the operation amount of the outside air mixing device 42 is an operation amount for cooling the exhaust temperature for heating the urea aqueous solution stored in the tank 34 to a predetermined temperature or less, and for example, a duty ratio according to the opening degree can be applied.
- the predetermined temperature is a temperature at which ammonia-based gas is not generated even when the urea aqueous solution is heated. For example, about 60 ° C. can be adopted.
- step 7 the control unit 68 outputs a signal corresponding to the operation amount to the outside air mixing device 42.
- step 8 since the control unit 68 determines that the urea aqueous solution stored in the tank 34 is not frozen, the control unit 68 instructs the outside air mixing device 42 to shut off the exhaust gas diverted from the exhaust pipe 24 to the bypass pipe 40.
- a passage blocking signal for the bypass pipe 40 is output.
- the outside air mixing device 42 blocks the passage of the bypass pipe 40, the exhaust gas supplied from the oxidation catalytic converter 32 to the outside air mixing device 42 is returned to the exhaust pipe 24 through the exhaust return pipe 46.
- the urea aqueous solution thawing process realized by the control program will be described.
- Part of the exhaust gas that has passed through the oxidation catalyst converter 32 is supplied to the outside air mixing device 42. If the temperature Tu of the urea aqueous solution stored in the tank 34 is higher than the freezing determination temperature or if the urea aqueous solution can be sucked, it is determined that the urea aqueous solution in the tank 34 is not frozen or thawed, and the outside air mixing device 42
- the exhaust gas supplied to is returned to the exhaust passage 24 through the exhaust return pipe 46. For this reason, when the urea aqueous solution in the tank 34 is not frozen, the urea aqueous solution is not heated more than necessary, and for example, generation of components derived from urea can be suppressed.
- the temperature Tu of the urea aqueous solution stored in the tank 34 is equal to or lower than the freezing determination temperature and the urea aqueous solution cannot be sucked, it is determined that the urea aqueous solution in the tank 34 is frozen, and the exhaust temperature Te and the outside air temperature To The outside air mixing device 42 is controlled by an operation amount corresponding to the above.
- the temperature Tu of the urea aqueous solution being equal to or lower than the freezing determination, it is determined that the urea aqueous solution stored in the tank 34 is frozen when the urea aqueous solution cannot be sucked. Can be improved.
- the exhaust gas cooled to a predetermined temperature or less is supplied to the tank 34. Then, the exhaust gas flowing through the bypass pipe 40 and the urea aqueous solution in the tank 34 exchange heat, and the urea aqueous solution is thawed. At this time, since the tank 34 is made of metal, the urea aqueous solution is heated from its bottom wall and peripheral wall. Further, since the exhaust gas for thawing the urea aqueous solution has a high temperature even immediately after a cold start, the exhaust gas is cooled to the appropriate temperature by the outside air.
- the tank 34 can be mounted at a position away from the diesel engine 10. Further, since the thawing pipe is not disposed inside the tank 34, there is no possibility of reducing the capacity of the tank 34.
- the exhaust for heating the urea aqueous solution stored in the tank 34 is not limited to the exhaust flowing through the exhaust pipe 24 but may be exhaust flowing through the EGR pipe 38A of the EGR device 38 as shown in FIG.
- the thawing target is not limited to the urea aqueous solution stored in the tank 34, but may be various liquid reducing agents or precursors thereof used in an exhaust purification device that selectively reduces and purifies NOx.
- whether or not the urea aqueous solution stored in the tank 34 is frozen is determined based on one of two conditions: the temperature Tu of the urea aqueous solution is equal to or lower than the freezing determination temperature, or the urea aqueous solution cannot be sucked. You can also
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Abstract
Description
図1は、排気中の粒子状物質(PM;Particulate Matter)及びNOxを浄化する排気浄化装置の一例を示す。
ステップ1(図では、「S1」と略記する。以下同様。)では、コントロールユニット68が、還元剤温度センサ60から尿素水溶液の温度Tuを読み込む。
ステップ5では、コントロールユニット68が、外気温度センサ62から外気温度Toを読み込む。
ステップ8では、コントロールユニット68が、タンク34に貯蔵された尿素水溶液が凍結していないと判定したため、排気管24から迂回管40へと分流する排気を遮断すべく、外気混合装置42に対して迂回管40の通路遮断信号を出力する。ここで、外気混合装置42が迂回管40の通路を遮断すると、酸化触媒コンバータ32から外気混合装置42へと供給された排気は、排気戻し管46を通って排気管24へと戻される。
酸化触媒コンバータ32を通過した排気の一部は、外気混合装置42に供給される。タンク34に貯蔵された尿素水溶液の温度Tuが凍結判定温度より高く、又は、尿素水溶液が吸入できたならば、タンク34の尿素水溶液は凍結していない又は解凍されたと判定され、外気混合装置42に供給された排気は、排気戻し管46を通って排気通路24へと戻される。このため、タンク34の尿素水溶液が凍結していない場合には、尿素水溶液を必要以上に加熱することがなく、例えば、尿素由来の成分が生成されることを抑制することができる。
26B DPF
28 噴射ノズル
30 SCRコンバータ
32 酸化触媒コンバータ
34 タンク
38A EGR管
40 迂回管
42 外気混合装置
48 メタルシート
50 ブラケット
58 排気温度センサ
60 還元剤温度センサ
62 外気温度センサ
68 コントロールユニット
Claims (13)
- 排気中の窒素酸化物を還元浄化する還元触媒コンバータと、
液体還元剤又はその前駆体を貯蔵するタンクと、
前記タンクに貯蔵された液体還元剤又はその前駆体を、前記還元触媒コンバータの排気上流に噴射する噴射ノズルと、
排気管を流れる排気の一部を前記タンクへと迂回させ、前記タンクに貯蔵された液体還元剤又はその前駆体との間で熱交換させる迂回管と、
を有することを特徴とする排気浄化装置。 - 前記迂回管を流れる排気に対して外気を混合させる外気混合装置を更に有することを特徴とする請求項1に記載の排気浄化装置。
- 前記迂回管は、前記タンクを車体に取り付けるブラケットの少なくとも一部を形成することを特徴とする請求項1に記載の排気浄化装置。
- 排気の温度を検出する排気温度センサと、
外気の温度を検出する外気温度センサと、
前記排気温度センサにより検出された排気の温度、及び、前記外気温度センサにより検出された外気の温度に基づいて、前記外気混合装置を制御するコントロールユニットと、
を更に有することを特徴とする請求項2に記載の排気浄化装置。 - 前記タンクに貯蔵された液体還元剤又はその前駆体の温度を検出する還元剤温度センサを更に有し、
前記外気混合装置は、前記排気管から前記迂回管へと分流する排気を遮断する機能を有すると共に、
前記コントロールユニットは、前記還元剤温度センサにより検出された液体還元剤又はその前駆体の温度に基づいて、前記タンクに貯蔵された液体還元剤又はその前駆体が凍結しているか否かを判定し、前記液体還元剤又はその前駆体が凍結していないと判定した場合に、前記排気管から前記迂回管へと分流する排気を遮断するように前記外気混合装置を制御することを特徴とする請求項4に記載の排気浄化装置。 - 前記迂回管と前記タンクとの間に、メタルシートが介在されていることを特徴とする請求項1に記載の排気浄化装置。
- 前記メタルシートに、ヒートシンクが取り付けられていることを特徴とする請求項6に記載の排気浄化装置。
- 前記還元触媒コンバータの排気下流に、前記還元触媒コンバータを通過した液体還元剤又はその前駆体を酸化させる酸化触媒コンバータが更に配設されていることを特徴とする請求項1に記載の排気浄化装置。
- 前記還元触媒コンバータの排気上流に、排気中の粒子状物質を除去するディーゼルパティキュレートフィルタが更に配設されていることを特徴とする請求項1に記載の排気浄化装置。
- 前記液体還元剤又はその前駆体は、尿素水溶液であることを特徴とする請求項1に記載の排気浄化装置。
- 排気中の窒素酸化物を還元浄化する還元触媒コンバータの排気上流に噴射する液体還元剤又はその前駆体を貯蔵するタンクを、排気管を流れる排気の一部で加熱し、前記タンク内で凍結した液体還元剤又はその前駆体を解凍することを特徴とする液体還元剤又はその前駆体の解凍方法。
- 前記タンクを加熱する排気に外気を混合して、前記排気と前記外気との混合気の温度を低下させることを特徴とする請求項11に記載の液体還元剤又はその前駆体の解凍方法。
- 前記迂回管は、前記タンクを車体に取り付けるブラケットの少なくとも一部を形成することを特徴とする請求項11に記載の液体還元剤又はその前駆体の解凍方法。
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PCT/JP2012/068723 WO2014016909A1 (ja) | 2012-07-24 | 2012-07-24 | 排気浄化装置、液体還元剤又はその前駆体の解凍方法 |
CN201280074323.4A CN104395572B (zh) | 2012-07-24 | 2012-07-24 | 排气净化装置、液体还原剂或者其前体的解冻方法 |
EP12881718.6A EP2886815B1 (en) | 2012-07-24 | 2012-07-24 | Exhaust gas purification device, and method for thawing liquid reducing agent or precursor thereof |
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US14/602,171 US9732650B2 (en) | 2012-07-24 | 2015-01-21 | Exhaust gas purification apparatus, and method for thawing liquid reducing agent or precursor thereof |
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- 2012-07-24 CN CN201280074323.4A patent/CN104395572B/zh active Active
- 2012-07-24 BR BR112014032038-1A patent/BR112014032038B1/pt not_active IP Right Cessation
- 2012-07-24 WO PCT/JP2012/068723 patent/WO2014016909A1/ja active Application Filing
- 2012-07-24 JP JP2014526645A patent/JP5859651B2/ja not_active Expired - Fee Related
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2015
- 2015-01-21 US US14/602,171 patent/US9732650B2/en active Active
- 2015-02-18 IN IN1336DEN2015 patent/IN2015DN01336A/en unknown
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WO2016103417A1 (ja) * | 2014-12-25 | 2016-06-30 | ボルボ トラック コーポレーション | エンジンの排気浄化装置 |
JPWO2016103417A1 (ja) * | 2014-12-25 | 2017-10-05 | ボルボトラックコーポレーション | エンジンの排気浄化装置 |
US10513960B2 (en) | 2014-12-25 | 2019-12-24 | Volvo Truck Corporation | Exhaust purification device for engine |
Also Published As
Publication number | Publication date |
---|---|
EP2886815A4 (en) | 2016-03-16 |
EP2886815B1 (en) | 2017-03-15 |
US20150128570A1 (en) | 2015-05-14 |
JP5859651B2 (ja) | 2016-02-10 |
JPWO2014016909A1 (ja) | 2016-07-07 |
US9732650B2 (en) | 2017-08-15 |
BR112014032038B1 (pt) | 2021-08-17 |
EP2886815A1 (en) | 2015-06-24 |
BR112014032038A2 (pt) | 2017-11-21 |
IN2015DN01336A (ja) | 2015-07-03 |
CN104395572B (zh) | 2017-02-22 |
CN104395572A (zh) | 2015-03-04 |
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