CN105697106A - Urea heating device for efficient SCR, and use method thereof - Google Patents
Urea heating device for efficient SCR, and use method thereof Download PDFInfo
- Publication number
- CN105697106A CN105697106A CN201610080376.7A CN201610080376A CN105697106A CN 105697106 A CN105697106 A CN 105697106A CN 201610080376 A CN201610080376 A CN 201610080376A CN 105697106 A CN105697106 A CN 105697106A
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- China
- Prior art keywords
- metal carrier
- urea
- carrier catalyst
- scr
- carbamide
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Classifications
-
- 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
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
- F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
-
- 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]
- F01N3/2073—Selective catalytic reduction [SCR] with means for generating a reducing substance from the exhaust gases
-
- 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
- F01N3/28—Construction of catalytic reactors
- F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
-
- 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
-
- 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
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
- F01N2900/1404—Exhaust gas temperature
-
- 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
-
- 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
-
- 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
Abstract
The invention relates to a urea heating device and a use method thereof, and particularly relates to a urea heating device for efficient SCR, and a use method thereof. The device comprises a temperature sensor, a urea nozzle, a metal carrier catalyst and an SCR device, wherein the temperature sensor, the urea nozzle and the metal carrier catalyst are arranged in front of the SCR device, and are sequentially arranged on an exhaust pipeline from the front to rear. According to the device disclosed by the invention, through the method of adding the metal carrier catalyst close to the urea nozzle, and carrying out ECU control heating, the crystallization risk of the efficient SCR is reduced, the energy consumed for engine heat management is reduced, and accurate control for the heating temperature and time is realized.
Description
Technical field
The present invention relates to a kind of urea heating device and using method thereof, especially relate to a kind of urea heating device for efficient SCR and using method thereof。
Background technology
SCR: SCR, this technology is to eliminate the technical way of nitrogen oxides in engine exhaust。
SCR reduces the chemical reaction of nitrogen oxides:
NO+NO2+2NH3→2N2+3H2O
Urea liquid sprays in exhaustor through urea nozzle, when temperature occurs pyrolytic reaction to produce ammonia (NH more than 200 DEG C3), ammonia under catalyst action with the NO in waste gasxReaction, reaches to reduce NOxThe purpose of discharge。
Urea pyrolysis reacts:
(NH)2CO2→NH3+HNCO
HNCO+H2O→NH3+CO2
Efficient SCR technology: control the transformation efficiency of SCR higher than 96%；The urea injecting quantity that efficient SCR technology needs is higher, contains low-temperature region wider, thus crystallization risk also increases accordingly。
Its main working process of electromotor using SCR technology is that urea liquid sprays in exhaustor through urea nozzle, occurs pyrolytic reaction to produce ammonia (NH at a certain temperature3), ammonia reacts with the NOx in waste gas under catalyst action, reaches to reduce the purpose of NOx emission。
Carbamide is after urea nozzle, and carbamide spraying environment temperature is more high, and urea pyrolysis reaction is more fast。Otherwise, temperature is more low, and the pyrolytic reaction of carbamide is more slow more insufficient。Once urea pyrolysis is insufficient will form crystallization, affect the normal operation of whole exhaust after treatment system。Therefore, SCR technology application must solve urea crystals problem。
When electromotor is operated in running on the lower load, engine exhaust temperature is relatively low, it is necessary to SCR is less；But too low delivery temperature is still easily caused carbamide decomposes insufficient, it is easy to urea crystals problem occur。If by the burn incompletely means of fuel oil, it is possible to promote delivery temperature to a certain extent, but to overall gas exhaust piping adding heat waster fuel oil and to promote temperature relatively slow, and easily make discharge deteriorate。
Thering is provided a kind of high SCR conversion ratio aerofluxus attemperating unit in prior art, in this device, temperature sensor gathers the temperature of SCR reduction reaction environment。When temperature is lower than required temperature, electronic control unit drives heater by this place's tail gas heating to required temperature；When temperature is higher than required temperature, electronic control unit drives chiller that this place's tail gas is cooled to required temperature。But this device is the temperature that the waste gas by heating in whole gas exhaust piping promotes urea nozzle place, and heating required time is long, bad response, and device volume is big, wastes energy。The commonly required urea injecting quantity of the relatively low operating mode of engine exhaust temperature is also fewer, and in this technology, the mode of heating indirectly can not be adjusted according to the emitted dose of SCR, and energy expenditure is big。
Summary of the invention
For solving to use the easy crystallization of carbamide of electromotor of SCR technology, the engine thermal management waste problem that energy is many, heats is bad in the market, the present invention provides a kind of urea heating device for efficient SCR and using method thereof, by increasing the method that metal carrier catalyst and ECU control heating near urea nozzle, reduce efficient SCR crystallization risk, be reduced to engine thermal and manage consume energy, realize accurately controlling heating-up temperature and time。
In order to reach object above, the present invention takes techniques below scheme, and a kind of urea heating device for efficient SCR, including temperature sensor, urea nozzle, metal carrier catalyst and SCR；Before temperature sensor, urea nozzle, metal carrier catalyst are placed in SCR, three is arranged on gas exhaust piping successively from front to back；
Temperature sensor, passes to Engine ECU by the temperature signal of identification；
Urea nozzle, spray angle is adjustable, and the spraying of ejection is just directed at metal carrier catalyst；
Metal carrier catalyst is a kind of open grain structure, it is possible to is effectively increased the contact area of carbamide spraying and metal carrier catalyst, accelerates urea pyrolysis response speed；Inside it can electrified regulation, outside be connected with car load power supply, its conduction time is by Engine ECU control；The heating function of metal carrier catalyst is controlled by controlling the connecting and disconnecting of electric current。
A kind of above-mentioned using method for the urea heating device of efficient SCR is as follows:
(1) after the entrance being provided with the gas exhaust piping of described device is arranged on turbocharger, for there being the electromotor of DOC, DPF, after entrance is arranged on DOC, DPF；Outlet is before SCR；
(2) adjusting the spray angle of urea nozzle, make the spraying of carbamide just be directed at metal carrier catalyst, namely carbamide is after urea nozzle, and the carbamide of atomization is directly heated by metal carrier catalyst；
(3) temperature signal of identification is passed to Engine ECU by the temperature sensor before being arranged in urea nozzle；When EGT is lower than temperature limit, if needing injection carbamide, then turn-on current, metal carrier catalyst is energized, and higher temperature can promote the pyrolytic reaction of carbamide, and Engine ECU is adjusted controlling heat time heating time according to urea injecting quantity simultaneously；When EGT is higher than specified temp limit value, EGT can ensure that the transformation efficiency of SCR is in higher level, and now, metal carrier catalyst stops energising。
This heater can be relatively low at engine exhaust temperature, but needs fast lifting temperature under the operating mode that carbamide sprays, makes urea pyrolysis abundant, it is to avoid urea crystals。Under the operating mode that engine exhaust temperature is higher can intelligence disconnection, save the energy。It is effectively ensured SCR and is operated in high transformation efficiency interval。
The invention have the advantage that
1. relatively low at engine exhaust temperature, but need fast lifting temperature under the operating mode that carbamide sprays, make urea pyrolysis abundant, it is to avoid urea crystals, reduce efficient SCR crystallization risk。
2. under the operating mode that engine exhaust temperature is higher can the disconnection of intelligence, save the energy, be reduced to engine thermal and manage the energy that consumes。
3. heating controlled by ECU, direct antipyretic carbamide, heat time heating time the emitted dose Based Intelligent Control according to carbamide, heating-up temperature and time can realize accurate control。
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings。
Fig. 1 is the structural representation of the present invention；
1-temperature sensor in figure, 2-urea nozzle, 3-metal carrier catalyst, 4-SCR。
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is a part of embodiment of the present invention, rather than whole embodiments。Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention。
Embodiment 1:
A kind of urea heating device for efficient SCR, including temperature sensor 1, urea nozzle 2, metal carrier catalyst 3 and SCR4；Before temperature sensor 1, urea nozzle 2, metal carrier catalyst 3 are placed in SCR4, three is arranged on gas exhaust piping successively from front to back；
Temperature sensor 1, passes to Engine ECU by the temperature signal of identification；
Urea nozzle 2, spray angle is adjustable, and the spraying of ejection is just directed at metal carrier catalyst 3；
Metal carrier catalyst 3 is a kind of open grain structure, inside can electrified regulation, outside be connected with car load power supply, its conduction time is by Engine ECU control；The heating function of metal carrier catalyst 3 is controlled by controlling the connecting and disconnecting of electric current。
A kind of above-mentioned using method for the urea heating device of efficient SCR is as follows:
(1) after the entrance being provided with the gas exhaust piping of described device is arranged on turbocharger, for there being the electromotor of DOC, DPF, after entrance is arranged on DOC, DPF；Outlet is before SCR4；
(2) adjusting the spray angle of urea nozzle 2, make the spraying of carbamide just be directed at metal carrier catalyst 3, namely carbamide is after urea nozzle 2, and the carbamide of atomization is directly heated by metal carrier catalyst 3；
(3) temperature signal of identification is passed to Engine ECU by the temperature sensor 1 before being arranged in urea nozzle 2；When EGT is lower than temperature limit, if needing injection carbamide, then turn-on current, metal carrier catalyst 3 is energized, and higher temperature can promote the pyrolytic reaction of carbamide, and Engine ECU is adjusted controlling heat time heating time according to urea injecting quantity simultaneously；When EGT is higher than specified temp limit value, EGT can ensure that the transformation efficiency of SCR4 is in higher level, and now, metal carrier catalyst 3 stops energising。
This metal carrier catalyst is a kind of open grain structure, it is possible to is effectively increased the contact area of carbamide spraying and metal carrier catalyst, accelerates urea pyrolysis response speed；Inside it can electrified regulation, outside be connected with car load power supply, its conduction time can by Engine ECU control。After the energising of this metal carrier catalyst, under the function of current, metal carrier catalyst progressively heats up。During installation, by adjusting the spray angle of urea nozzle, making the spraying of carbamide just be directed at metal carrier catalyst, namely carbamide is after urea nozzle, and the carbamide of atomization is directly heated by metal carrier catalyst。
In the process of electromotor work, according to different applying working conditions, engine exhaust temperature is different。The temperature signal of identification can be passed to Engine ECU by the temperature sensor before being arranged in urea nozzle。When EGT is lower than a certain temperature limit, if needing injection carbamide, then metal carrier catalyst energising, higher temperature can promote the pyrolytic reaction of carbamide。When EGT is higher than specified temp limit value, EGT can ensure that the transformation efficiency of SCR is in higher level, and now, metal carrier catalyst stops energising。
This heater can be relatively low at engine exhaust temperature, but needs fast lifting temperature under the operating mode that carbamide sprays, makes urea pyrolysis abundant, it is to avoid urea crystals。Under the operating mode that engine exhaust temperature is higher can intelligence disconnection, save the energy。It is effectively ensured SCR and is operated in high transformation efficiency interval。
This heater is controlled by Engine ECU, and heat time heating time can be adjusted according to urea injecting quantity。The mode controlled is simple, it is only necessary to the connecting and disconnecting controlling electric current can complete。
The heating power that this heater directly heats carbamide spraying required is little, and response is rapidly。
Claims (2)
1. the urea heating device for efficient SCR, it is characterised in that: include temperature sensor (1), urea nozzle (2), metal carrier catalyst (3) and SCR (4)；Before temperature sensor (1), urea nozzle (2), metal carrier catalyst (3) are placed in SCR (4), three is arranged on gas exhaust piping successively from front to back；
Temperature sensor (1), passes to Engine ECU by the temperature signal of identification；
Urea nozzle (2), spray angle is adjustable, and the spraying of ejection is just directed at metal carrier catalyst (3)；
Metal carrier catalyst (3) is a kind of open grain structure, inside can electrified regulation, outside be connected with car load power supply, its conduction time is by Engine ECU control；The heating function of metal carrier catalyst (3) is controlled by controlling the connecting and disconnecting of electric current。
2. for the using method of the urea heating device of efficient SCR described in a claim 1, it is characterised in that:
(1) after the entrance being provided with the gas exhaust piping of described device is arranged on turbocharger, for there being the electromotor of DOC, DPF, after entrance is arranged on DOC, DPF；Outlet is before SCR (4)；
(2) spray angle of urea nozzle (2) is adjusted, the spraying making carbamide is just directed at metal carrier catalyst (3), namely carbamide is after urea nozzle (2), and the carbamide of atomization is directly heated by metal carrier catalyst (3)；
(3) temperature signal of identification is passed to Engine ECU by the temperature sensor (1) before being arranged in urea nozzle (2)；When EGT is lower than temperature limit, if needing injection carbamide, then turn-on current, metal carrier catalyst (3) is energized, higher temperature can promote the pyrolytic reaction of carbamide, and Engine ECU is adjusted controlling heat time heating time according to urea injecting quantity simultaneously；When EGT is higher than specified temp limit value, EGT can ensure that the transformation efficiency of SCR (4) is in higher level, and now, metal carrier catalyst (3) stops energising。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610080376.7A CN105697106A (en) | 2016-02-05 | 2016-02-05 | Urea heating device for efficient SCR, and use method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610080376.7A CN105697106A (en) | 2016-02-05 | 2016-02-05 | Urea heating device for efficient SCR, and use method thereof |
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| CN105697106A true CN105697106A (en) | 2016-06-22 |
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| CN201610080376.7A Pending CN105697106A (en) | 2016-02-05 | 2016-02-05 | Urea heating device for efficient SCR, and use method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109973177A (en) * | 2019-03-29 | 2019-07-05 | 河南科技大学 | A kind of diesel engine after treatment device |
| CN110537008A (en) * | 2017-04-13 | 2019-12-03 | 世倍特集团有限责任公司 | Exhaust system |
| CN110761879A (en) * | 2019-12-27 | 2020-02-07 | 潍柴动力股份有限公司 | Method and device for controlling urea crystallization, storage medium, and electronic device |
| CN111365095A (en) * | 2020-03-20 | 2020-07-03 | 一汽解放汽车有限公司 | Electric heating particle catcher post-processing system for diesel engine |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110537008A (en) * | 2017-04-13 | 2019-12-03 | 世倍特集团有限责任公司 | Exhaust system |
| CN109973177A (en) * | 2019-03-29 | 2019-07-05 | 河南科技大学 | A kind of diesel engine after treatment device |
| CN110761879A (en) * | 2019-12-27 | 2020-02-07 | 潍柴动力股份有限公司 | Method and device for controlling urea crystallization, storage medium, and electronic device |
| CN111365095A (en) * | 2020-03-20 | 2020-07-03 | 一汽解放汽车有限公司 | Electric heating particle catcher post-processing system for diesel engine |
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Application publication date: 20160622 |