CN106401704A - Sulfur poisoning eliminating device for SCR (selective catalytic reduction) catalyst of diesel engine and using method of sulfur poisoning eliminating device - Google Patents

Sulfur poisoning eliminating device for SCR (selective catalytic reduction) catalyst of diesel engine and using method of sulfur poisoning eliminating device Download PDF

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Publication number
CN106401704A
CN106401704A CN201610963752.7A CN201610963752A CN106401704A CN 106401704 A CN106401704 A CN 106401704A CN 201610963752 A CN201610963752 A CN 201610963752A CN 106401704 A CN106401704 A CN 106401704A
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scr catalyst
sensor
dpf
sulfur poisoning
scr
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CN106401704B (en
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陈镇
殷勇
项旭昇
黄永祥
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Dongfeng Trucks Co ltd
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Dongfeng Trucks Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • 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
    • F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust 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
    • 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
    • F01N3/023—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 using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/025—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 using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
    • F01N3/0253—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 using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust adding fuel to 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
    • 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
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12—Control of the pumps
    • F02B37/18—Control of the pumps by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
    • 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
    • F01N2250/00—Combinations of different methods of purification
    • F01N2250/02—Combinations of different methods of purification filtering and catalytic conversion
    • 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
    • F01N2390/00—Arrangements for controlling or regulating exhaust apparatus
    • F01N2390/02—Arrangements for controlling or regulating exhaust apparatus using electric components only
    • 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
    • F01N2410/00—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device
    • F01N2410/04—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device during regeneration period, e.g. of particle filter
    • 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
    • F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
    • F01N2550/06—By-pass systems
    • 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
    • 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
    • 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
    • F01N2560/08—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a pressure sensor
    • 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
    • F01N2560/14—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics having more than one sensor of one kind
    • 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
    • F01N2900/04—Methods of control or diagnosing
    • F01N2900/0416—Methods of control or diagnosing using the state of a sensor, e.g. of an exhaust gas sensor
    • 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
    • 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
    • F01N2900/1406—Exhaust gas pressure
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

A sulfur poisoning eliminating device for SCR catalyst of diesel engine is composed of DOC, DPF, and a filter,The SCR catalyst, take bypass pipeline, aftertreatment controller of electric control governing valve, the inlet end of DOC loops through inlet pipe way, turbo charger and engine exhaust pipe intercommunication, the exhaust end communicates with each other through DPF and SCR catalyst, the inlet of bypass pipeline, exhaust end communicate with each other with exhaust pipe, inlet pipe way respectively, be provided with a temperature sensor on the inlet pipe way, NO No. oneXThe sensor and the DPF regenerate fuel nozzle, pressure sensors are arranged at the air inlet end and the air outlet end of the DPF, and a second temperature sensor and a second NO are respectively arranged at the air inlet end and the air outlet end of the SCR catalystXWhen the sensor is used, the aftertreatment controller controls the DPF regeneration fuel nozzle and the electric control regulating valve according to whether DPF regeneration is needed or not and the operation working condition of the diesel engine so as to meet the high-temperature condition of SCR catalyst desulfurization. The design makes the fuel economy of the engine deteriorate to a low degree.

Description

A kind of diesel SCR catalytic device sulfur poisoning cancellation element and its using method
Technical field
The invention belongs to diesel emission post processing field is and in particular to a kind of diesel SCR catalytic device sulfur poisoning eliminates Device and its using method are it is adaptable to reduce Fuel Economy deterioration degree.
Background technology
For tackling increasingly stricter emission regulation demands, large diesel engine commonly used DOC+ after the Europe VI stage The after-treatment system of DPF+SCR+ASC, wherein SCR (SCR) are that diesel engine meets having most of NOx emission target One of technology of effect.The impact to SCR for the dpf regeneration temperature, worst cold case NO is considered in the VI after-treatment system of EuropeXHigh conversion effect The reasons such as the demand of rate, the commonly used copper-based zeolite type SCR in market.However, copper-based zeolite type SCR has sulfur poisoning and asks Topic, test data shows, large diesel engine run under the conditions of sulfur content 50ppm diesel oil 100 hours SCR conversion efficiency may under Fall 20%, and run 15 hours SCR conversion efficiency under the conditions of sulfur content 350ppm diesel engine and will decline 20%.And the Europe VI stage OBD is very high to post processing coherence request, and SCR sulfur poisoning can lead to DS NOx Est exceeded, leads to engine to be reported to the police and limit is turned round, sternly Ghost image rings the operation of engine.
Copper-based SCR mechanism of sulfur poisoning is that the S oxidation in engine combustion process intermediate fuel oil forms SO2, and with containing metal Catalyst converter wash coat or water reaction form sulfate or sulfuric acid, finally adsorb the surface in catalyst, lead to SCR Decrease in efficiency.Copper-based SCR sulfur poisoning phenomenon is not permanent damage, can be carried out by more than 500 DEG C of high-temperature gas Desulfurization regeneration, the conversion efficiency of desulfurization regeneration SCR can return to level before sulfur poisoning.But this temperature is in diesel engine conventional operation Under the conditions of hardly possible reach.
Chinese patent：Application publication number is CN105370355A, and Shen Qing Publication day is the patent of invention on March 2nd, 2016 Disclose a kind of engine aftertreatment system, the turbocharger being sequentially connected including the exhaust piping with engine, oxidation are urged Change converter DOC, particulate matter trap DPF, SCR device, and corresponding temperature sensor, pressure sensor, nitrogen oxygen biography are set Sensor etc..After SCR device sulfur poisoning in this system, the transformation efficiency of NOx can seriously reduce, therefore in actual application, Need to carry out sulfur poisoning monitoring to it, and regular desulfurization.Commonly used dpf regeneration fuel injector cartridge at present in the VI after-treatment system of Europe Put and carry out intensification and realize high temperature desulfurizing regeneration, but frequently active oil spout intensification desulfurization can lead to serious engine fuel economy Property deteriorate.
Content of the invention
The purpose of the present invention is the problem overcoming the Fuel Economy deterioration degree that prior art exists higher, carries For a kind of structure is simple, Fuel Economy deterioration degree is relatively low diesel SCR catalytic device sulfur poisoning cancellation element and Its using method.
For realizing object above, technical scheme is as follows：
A kind of diesel SCR catalytic device sulfur poisoning cancellation element, including engine, turbocharger, oxidation catalytic converter DOC, particulate matter trap DPF, SCR catalyst, the inlet end of described DOC passes sequentially through air inlet pipeline, turbocharger and sends out The blast pipe connection of motivation, the exhaust end of DOC is communicated with SCR catalyst by DPF, and is provided with a temperature on air inlet pipeline Sensor, a NOXSensor, the inlet and outlet end of DPF is provided with pressure sensor, and the inlet and outlet end of SCR catalyst is divided It is not provided with No. two temperature sensors, No. two NOXSensor；
Described system also includes bypass line, dpf regeneration fuel nozzle, the inlet and outlet end of described bypass line respectively with exhaust Pipe, air inlet pipeline communicate, and bypass line are provided with electric controlled regulating valve, described dpf regeneration fuel nozzle is arranged on air inlet pipeline On, and temperature sensor, a NOXSensor, pressure sensor, No. two temperature sensors, No. two NOXSensor, automatically controlled Regulating valve, dpf regeneration fuel nozzle are all connected with aftertreatment controller signal.
Described SCR catalyst is copper-based zeolite type SCR.
A kind of using method of diesel SCR catalytic device sulfur poisoning cancellation element, comprises the following steps successively：
S1：Described aftertreatment controller is according to a NOXSensor, No. two NOXThe detection data of sensor, vehicle traveling away from Judge whether to need to eliminate SCR catalyst with the running time of rear vehicle from, fuel consumption and the last sulfur poisoning that eliminates Sulfur poisoning, if desired, enter step S2；
S2：The detection data based on pressure sensor for the described aftertreatment controller, carbon carrying capacity calculate, limit carbon carrying capacity setting value is sentenced Disconnected DPF is the need of regeneration, if desired, entering step S4, if not needing, entering step S3；
S3：Implement exhaust gas bypass to control to eliminate entrance step S6 after sulfur poisoning；
S4：Described aftertreatment controller controls dpf regeneration fuel nozzle to air inlet according to the detection data of No. two temperature sensors Spray fuel oil in pipeline, to realize the initiative regeneration of DPF, and remove the sulphur in SCR catalyst；
S5：Described aftertreatment controller judges whether dpf regeneration completes, if completing, entering step S6, if not completing, entering again Enter step S4；
S6：Described aftertreatment controller judges whether the sulfur poisoning of SCR catalyst is removed, if not removing, is again introduced into step S1；
Wherein, described enforcement exhaust gas bypass controls and is comprised the following steps successively with eliminating sulfur poisoning：
S31：According to the detection data of a temperature sensor, described aftertreatment controller judges whether diesel engine is in high temperature, height Air-fuel ratio operating mode, if so, enters step S34, if it is not, then entering step S32；
S32：Described aftertreatment controller judges whether the sulphur accumulated time of SCR catalyst and SCR conversion efficiency drop to the limit Value, if so, enters step S33, if it is not, being then again introduced into step S31；
S33：Described aftertreatment controller controls dpf regeneration fuel nozzle to air inlet according to the detection data of No. two temperature sensors In pipeline, injection fuel oil is to remove the sulphur in SCR catalyst；
S34：Described aftertreatment controller controls the aperture of electric controlled regulating valve according to the detection data of No. two temperature sensors, makes The inlet temperature of SCR catalyst reaches 500～550 DEG C, to remove the sulphur in SCR catalyst.
Compared with prior art, beneficial effects of the present invention are：
1st, a kind of diesel SCR catalytic of present invention device sulfur poisoning cancellation element includes bypass line, dpf regeneration fuel nozzle, other The inlet and outlet end on siphunculus road is communicated with blast pipe, air inlet pipeline respectively, and bypass line is provided with electric controlled regulating valve, dpf regeneration Fuel nozzle is arranged on air inlet pipeline, and dpf regeneration fuel nozzle can spray in air inlet pipeline when needing DPF initiative regeneration Appropriate fuel oil, after fuel oil heats up through DOC oxidation, the high temperature that can realize SCR catalyst while realizing DPF initiative regeneration takes off Sulphur, bypass line enables portion to be directly bypassed on air inlet pipeline without turbocharger, thus ensureing to start Machine is promoted to more than 500 DEG C in the delivery temperature under high speed, middle and high load working condition, to realize the high temperature desulfurizing of SCR catalyst, Exhaust gas bypass both desulfurization methods before DPF oil spout regeneration and turbine are combined by this design, on the one hand, can reliably realize The high temperature desulfurizing of SCR catalyst, preferably it is ensured that the efficiency of Europe VI after-treatment system, on the other hand, this system is or not desulfurized effect Only to the change of former after-treatment system less, structure is simple, adaptability is good, and decrease as far as possible DPF oil spout regeneration time Number, reduces cost, and makes Fuel Economy deterioration degree relatively low.Therefore, not only desulfurized effect is good for the present invention, and And make Fuel Economy deterioration degree relatively low.
Brief description
Fig. 1 is the structural representation of present system.
Fig. 2 is the flow chart of the inventive method.
Fig. 3 is to implement the flow chart that exhaust gas bypass controls in the inventive method.
In figure：Engine 1, blast pipe 11, turbocharger 2, oxidation catalytic converter DOC3, air inlet pipeline 31, particle Thing trap DPF4, SCR catalyst 61, NO of 5, temperature sensorXSensor 62,63, No. two temperature of pressure sensor Degree 64, No. two NO of sensorXSensor 65, bypass line 7, electric controlled regulating valve 8, dpf regeneration fuel nozzle 9, processing controller 10.
Specific embodiment
The present invention is further detailed explanation with specific embodiment for explanation below in conjunction with the accompanying drawings.
Referring to Fig. 1 to Fig. 3, a kind of diesel SCR catalytic device sulfur poisoning cancellation element, including engine 1, turbocharger 2nd, oxidation catalytic converter DOC3, particulate matter trap DPF4, SCR catalyst 5, the inlet end of described DOC3 passes sequentially through air inlet Pipeline 31, turbocharger 2 are connected with the blast pipe 11 of engine 1, and the exhaust end of DOC3 passes through DPF4 and SCR catalyst 5 phase Logical, and 61, NO of a temperature sensor is provided with air inlet pipeline 31XSensor 62, the inlet and outlet end of DPF4 is respectively provided with There is pressure sensor 63, the inlet and outlet end of SCR catalyst 5 is respectively arranged with 64, No. two NO of No. two temperature sensorsXSensor 65；
Described system also includes bypass line 7, dpf regeneration fuel nozzle 9, the inlet and outlet end of described bypass line 7 respectively with row Tracheae 11, air inlet pipeline 31 communicate, and bypass line 7 is provided with electric controlled regulating valve 8, and described dpf regeneration fuel nozzle 9 is arranged on On air inlet pipeline 31, and 61, NO of a temperature sensorXSensor 62,63, No. two temperature sensors of pressure sensor 64th, No. two NOXSensor 65, electric controlled regulating valve 8, dpf regeneration fuel nozzle 9 are all connected with aftertreatment controller 10 signal.
Described SCR catalyst 5 is copper-based zeolite type SCR.
A kind of using method of diesel SCR catalytic device sulfur poisoning cancellation element, comprises the following steps successively：
S1：Described aftertreatment controller 10 is according to a NOX62, No. two NO of sensorXThe detection data of sensor 65, vehicle Operating range, fuel consumption and the last sulfur poisoning that eliminates judge whether to need to eliminate SCR with the running time of rear vehicle The sulfur poisoning of catalyst converter 5, if desired, enter step S2；
S2：The detection data based on pressure sensor 63 for the described aftertreatment controller 10, carbon carrying capacity calculate, limit carbon carrying capacity sets Value judges DPF4 the need of regeneration, if desired, entering step S4, if not needing, entering step S3；
S3：Implement exhaust gas bypass to control to eliminate entrance step S6 after sulfur poisoning；
S4：Described aftertreatment controller 10 according to the detection data of No. two temperature sensors 64 control dpf regeneration fuel nozzle 9 to Spray fuel oil in air inlet pipeline 31, to realize the initiative regeneration of DPF, and remove the sulphur in SCR catalyst 5；
S5：Described aftertreatment controller 10 judges whether dpf regeneration completes, if completing, enters step S6, if not completing, again Enter step S4；
S6：Described aftertreatment controller 10 judges whether the sulfur poisoning of SCR catalyst 5 is removed, if not removing, is again introduced into Step S1；
Wherein, described enforcement exhaust gas bypass controls and is comprised the following steps successively with eliminating sulfur poisoning：
S31：According to the detection data of a temperature sensor 61, described aftertreatment controller 10 judges whether diesel engine is in height Temperature, high air-fuel ratio operating mode, if so, enter step S34, if it is not, then entering step S32；
S32：Described aftertreatment controller 10 judges whether the sulphur accumulated time of SCR catalyst 5 and SCR conversion efficiency drop to pole Limit value, if so, enters step S33, if it is not, being then again introduced into step S31；
S33：Described aftertreatment controller 10 controls dpf regeneration fuel nozzle 9 according to the detection data of No. two temperature sensors 64 To in air inlet pipeline 31, injection fuel oil is to remove the sulphur in SCR catalyst 5；
S34：Described aftertreatment controller 10 controls opening of electric controlled regulating valve 8 according to the detection data of No. two temperature sensors 64 Degree, makes the inlet temperature of SCR catalyst 5 reach 500～550 DEG C, to remove the sulphur in SCR catalyst 5.
The principle of the present invention is described as follows：
The invention provides one kind by Europe VI post processing catalyst converter group, bypass line 7, dpf regeneration fuel nozzle 9, sensor group, The after-treatment system of aftertreatment controller 10 composition, wherein, dpf regeneration fuel nozzle 9 is used for when DPF4 needs initiative regeneration Spray into appropriate fuel oil in air inlet pipeline 31, to meet the temperature requirement of SCR catalyst 5 desulfurization；Bypass line 7 is used for part Engine exhaust is directly bypassed in air inlet pipeline 31 without turbocharger it is ensured that engine is in high speed, middle high load capacity Operating mode delivery temperature can be promoted to more than 500 DEG C, to meet the high temperature requirement of desulfurization；Aftertreatment controller 10 is used for according to biography Sensor signal and control algolithm control the electric controlled regulating valve 8 on dpf regeneration fuel nozzle 9 and bypass line 7.Its specific works mistake Journey is as follows：
When diesel engine occurs SCR catalyst 5 sulfur poisoning, and DPF4 needs regeneration simultaneously, aftertreatment controller 10 is according to No. two temperature The feedback signal of degree sensor 64 controls dpf regeneration fuel nozzle 9 to spray appropriate fuel oil in air inlet pipeline 31, and fuel oil passes through DOC3 heats up makes delivery temperature be increased to 550 DEG C about so that the regeneration of DPF4, realizes the desulfurization of SCR catalyst 5 simultaneously；
When diesel engine occurs SCR catalyst 5 sulfur poisoning, DPF4 does not need to regenerate, and diesel engine runs on high temperature, high air-fuel ratio work During condition, aftertreatment controller 10 controls electric controlled regulating valve 8 to open according to the feedback signal of No. two temperature sensors 64, and part is sent out Motivation exhaust is introduced directly in air inlet pipeline 31 so that the inlet temperature of SCR catalyst 5 controls at 500～550 DEG C, thus real The high temperature desulfurizing of existing SCR catalyst；
When diesel engine occurs SCR catalyst 5 sulfur poisoning, DPF4 does not need to regenerate, but diesel engine off-duty is in high temperature, high air-fuel ratio During operating mode, aftertreatment controller 10 controls dpf regeneration fuel nozzle 9 injection suitable according to the feedback signal of No. two temperature sensors 64 The fuel oil of amount, in air inlet pipeline 31, realizes the regeneration of DPF4 and the desulfurization of SCR catalyst 5.
Embodiment 1：
Referring to Fig. 1 to Fig. 3, a kind of diesel SCR catalytic device sulfur poisoning cancellation element, including engine 1, turbocharger 2, oxygen Change catalytic converter DOC3, particulate matter trap DPF4, SCR catalyst 5, bypass line 7, dpf regeneration fuel nozzle 9, described The inlet end of DOC3 passes sequentially through air inlet pipeline 31, turbocharger 2 is connected with the blast pipe 11 of engine 1, the exhaust of DOC3 End is communicated with SCR catalyst 5 by DPF4, and described SCR catalyst 5 is copper-based zeolite type SCR, the entering, arrange of described bypass line 7 Gas end is communicated with blast pipe 11, air inlet pipeline 31 respectively, and air inlet pipeline 31 is provided with 9, temperature of dpf regeneration fuel nozzle 61, NO of sensorXSensor 62, the inlet and outlet end of DPF4 is provided with pressure sensor 63, the entering of SCR catalyst 5, Exhaust end is respectively arranged with 64, No. two NO of No. two temperature sensorsXSensor 65, bypass line 7 is provided with electric controlled regulating valve 8, and 61, NO of a temperature sensorXSensor 62, pressure sensor 64, No. two NO of 63, No. two temperature sensorsXSensing Device 65, electric controlled regulating valve 8, dpf regeneration fuel nozzle 9 are all connected with aftertreatment controller 10 signal.
The using method of described diesel SCR catalytic device sulfur poisoning cancellation element follows the steps below successively：
S1：Described aftertreatment controller 10 is according to a NOX62, No. two NO of sensorXThe detection data of sensor 65, vehicle Operating range, fuel consumption and the last sulfur poisoning that eliminates judge whether to need to eliminate SCR with the running time of rear vehicle The sulfur poisoning of catalyst converter 5, if desired, enter step S2；
S2：The detection data based on pressure sensor 63 for the described aftertreatment controller 10, carbon carrying capacity calculate, limit carbon carrying capacity sets Value judges DPF4 the need of regeneration, if desired, entering step S4, if not needing, entering step S3；
S3：Implement exhaust gas bypass and control to eliminate entrance step S6 after sulfur poisoning, described enforcement exhaust gas bypass control is specially：
S31：According to the detection data of a temperature sensor 61, described aftertreatment controller 10 judges whether diesel engine is in height Temperature, high air-fuel ratio operating mode, if so, enter step S34, if it is not, then entering step S32；
S32：Described aftertreatment controller 10 judges whether the sulphur accumulated time of SCR catalyst 5 and SCR conversion efficiency drop to pole Limit value, if so, enters step S33, if it is not, being then again introduced into step S31；
S33：Described aftertreatment controller 10 controls dpf regeneration fuel nozzle 9 according to the detection data of No. two temperature sensors 64 To in air inlet pipeline 31, injection fuel oil is to remove the sulphur in SCR catalyst 5；
S34：Described aftertreatment controller 10 controls opening of electric controlled regulating valve 8 according to the detection data of No. two temperature sensors 64 Degree, makes the inlet temperature of SCR catalyst 5 reach 500～550 DEG C, to remove the sulphur in SCR catalyst 5；
S4：Described aftertreatment controller 10 according to the detection data of No. two temperature sensors 64 control dpf regeneration fuel nozzle 9 to Spray fuel oil in air inlet pipeline 31, to realize the initiative regeneration of DPF, and remove the sulphur in SCR catalyst 5；
S5：Described aftertreatment controller 10 judges whether dpf regeneration completes, if completing, enters step S6, if not completing, again Enter step S4；
S6：Described aftertreatment controller 10 judges whether the sulfur poisoning of SCR catalyst 5 is removed, if not removing, is again introduced into Step S1.

Claims (3)

1. a kind of diesel SCR catalytic device sulfur poisoning cancellation element, including engine（1）, turbocharger（2）, oxidation catalysis Converter DOC（3）, particulate matter trap DPF（4）, SCR catalyst（5）, described DOC（3）Inlet end pass sequentially through air inlet pipe Road（31）, turbocharger（2）With engine（1）Blast pipe（11）Connection, DOC（3）Exhaust end pass through DPF（4）With SCR Catalyst converter（5）Communicate, and air inlet pipeline（31）On be provided with a temperature sensor（61）, a NOXSensor（62）, DPF （4）Inlet and outlet end be provided with pressure sensor（63）, SCR catalyst（5）Inlet and outlet end be respectively arranged with No. two temperature Degree sensor（64）, No. two NOXSensor（65）It is characterised in that：
Described system also includes bypass line（7）, dpf regeneration fuel nozzle（9）, described bypass line（7）Inlet and outlet end divide Not and blast pipe（11）, air inlet pipeline（31）Communicate, bypass line（7）On be provided with electric controlled regulating valve（8）, described dpf regeneration Fuel nozzle（9）It is arranged on air inlet pipeline（31）On, and a temperature sensor（61）, a NOXSensor（62）, pressure pass Sensor（63）, No. two temperature sensors（64）, No. two NOXSensor（65）, electric controlled regulating valve（8）, dpf regeneration fuel nozzle （9）All and aftertreatment controller（10）Signal connects.
2. a kind of diesel SCR catalytic device sulfur poisoning cancellation element according to claim 1 it is characterised in that：Described SCR Catalyst converter（5）For copper-based zeolite type SCR.
3. the diesel SCR catalytic device sulfur poisoning cancellation element described in a kind of claim 1 using method it is characterised in that：
Described using method comprises the following steps successively：
S1：Described aftertreatment controller（10）According to a NOXSensor（62）, No. two NOXSensor（65）Detection data, With the running time of rear vehicle, the operating range of vehicle, fuel consumption and the last sulfur poisoning that eliminates judge whether that needs disappear Except SCR catalyst（5）Sulfur poisoning, if desired, enter step S2；
S2：Described aftertreatment controller（10）Based on pressure sensor（63）Detection data, carbon carrying capacity calculate, limit carbon carrying capacity Setting value judges DPF（4）The need of regeneration, if desired, entering step S4, if not needing, entering step S3；
S3：Implement exhaust gas bypass to control to eliminate entrance step S6 after sulfur poisoning；
S4：Described aftertreatment controller（10）According to No. two temperature sensors（64）Detection data control dpf regeneration fuel oil spray Mouth（9）To air inlet pipeline（31）Middle injection fuel oil, to realize the initiative regeneration of DPF, and removes SCR catalyst（5）In sulphur；
S5：Described aftertreatment controller（10）Judging whether dpf regeneration completes, if completing, entering step S6, if not completing, then Secondary entrance step S4；
S6：Described aftertreatment controller（10）Judge SCR catalyst（5）Sulfur poisoning whether remove, if not removing, again Enter step S1；
Wherein, described enforcement exhaust gas bypass controls and is comprised the following steps successively with eliminating sulfur poisoning：
S31：Described aftertreatment controller（10）According to a temperature sensor（61）Detection data judge whether diesel engine is located In high temperature, high air-fuel ratio operating mode, if so, enter step S34, if it is not, then entering step S32；
S32：Described aftertreatment controller（10）Judge SCR catalyst（5）Sulphur accumulated time and SCR conversion efficiency whether decline To limiting value, if so, enter step S33, if it is not, being then again introduced into step S31；
S33：Described aftertreatment controller（10）According to No. two temperature sensors（64）Detection data control dpf regeneration fuel oil spray Mouth（9）To air inlet pipeline（31）Middle injection fuel oil is to remove SCR catalyst（5）In sulphur；
S34：Described aftertreatment controller（10）According to No. two temperature sensors（64）Detection data control electric controlled regulating valve（8） Aperture, make SCR catalyst（5）Inlet temperature reach 500～550 DEG C, to remove SCR catalyst（5）In sulphur.
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