CN106988839A - Meet the diesel engine post-processing system of in-use automotive NOx and PM emission control - Google Patents

Meet the diesel engine post-processing system of in-use automotive NOx and PM emission control Download PDF

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Publication number
CN106988839A
CN106988839A CN201710383085.XA CN201710383085A CN106988839A CN 106988839 A CN106988839 A CN 106988839A CN 201710383085 A CN201710383085 A CN 201710383085A CN 106988839 A CN106988839 A CN 106988839A
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China
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scr
diesel engine
urea
nox
air
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臧志成
朱磊
赵闯
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Kailong High Technology Co Ltd
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Kailong High Technology Co Ltd
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Priority to CN201710383085.XA priority Critical patent/CN106988839A/en
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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]
    • 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
    • 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
    • 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
    • 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
    • F01N3/30—Arrangements for supply of additional air
    • F01N3/32—Arrangements for supply of additional air using air pump
    • 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
    • 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
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/14—Nitrogen oxides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • 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 present invention discloses a kind of diesel engine post-processing system for meeting in-use automotive NOx and PM emission control, and the system includes SCR urea after-treatment system and the combustion-supporting CDPF systems of low temperature burners oil spout；The SCR urea after-treatment system includes compressed air regulating valve, air submeter pump, diesel engine outlet NOx sensor, diesel engine outlet exhaust temperature sensor, SCR catalytic converter inlet temperature sensor, SCR catalytic converter outlet temperature sensor, urea temperature sensor, air pressure probe, urea nozzle, SCR catalytic converter, SCR ECUs.The present invention, using SCR and DPF technologies, realizes safe and reliable emission control under the various operating conditions of diesel engine, realizes diesel exhaust aftertreatment PM and NOx emission Collaborative Control with the requirement of diesel emission limit value.

Description

Meet the diesel engine post-processing system of in-use automotive NOx and PM emission control
Technical field
In-use automotive NOx and PM discharge are met the present invention relates to diesel engine vent gas post-processing technology field, more particularly to one kind The diesel engine post-processing system of control.
Background technology
In recent years, continuously there is haze phenomenon in each big city of China, seriously endangers health of people, the international shape of influence China As.Nitrogen oxides (NOx) and particulate matter (PM) discharge in control diesel engine vent gas are the keys for administering urban air pollution. High with the original row's PM discharges of car diesel engine, operating condition is severe, and row's temperature is low, and particle can not be carried out by relying solely on DPF passive regeneration Effective removing of thing.
The content of the invention
It is an object of the invention to by a kind of diesel engine post-processing system for meeting in-use automotive NOx and PM emission control, To solve the problem of background section above is mentioned.
For up to this purpose, the present invention uses following technical scheme：
A kind of diesel engine post-processing system for meeting in-use automotive NOx and PM emission control, it includes SCR urea post processing system System and the combustion-supporting CDPF systems of low temperature burners oil spout；It is auxiliary that the SCR urea after-treatment system includes compressed air regulating valve, air Help measuring pump, diesel engine outlet NOx sensor, diesel engine outlet exhaust temperature sensor, SCR catalytic converter inlet temperature sensing Device, SCR catalytic converter outlet temperature sensor, urea temperature sensor, air pressure probe, urea nozzle, SCR catalysis Converter, SCR ECUs；The compressed air regulating valve connects air submeter pump；The air submeter pump connects Connect urea tank；Diesel engine outlet NOx sensor, diesel engine outlet exhaust temperature sensor, SCR catalytic converter inlet temperature are passed Sensor, SCR catalytic converter outlet temperature sensor, urea temperature sensor, the air pressure probe connection automatically controlled lists of SCR Member；Described urea nozzle one end connects air submeter pump, other end connection SCR catalytic converter；The low temperature burners The combustion-supporting CDPF systems of oil spout include compressed air air pump, low-voltage fuel oil pump, Fuel air mixing device, igniter plug, fuel nozzle, Combustion chamber, wall-flow type CDPF catalytic converters, oxidisability DOC catalysts, DPF ECUs；The compressed air air pump One end connects DPF ECUs, other end connection Fuel air mixing device；Low-voltage fuel oil pump connection Fuel air mixing device, DPF ECUs；The Fuel air mixing device connects combustion chamber by fuel nozzle；The combustion chamber connection diesel engine, oxygen The property changed DOC catalysts；The oxidisability DOC catalysts connect wall-flow type CDPF catalytic converters；The wall-flow type CDPF catalytic converters are serially connected between blast pipe by flange.
Especially, the combustion-supporting CDPF systems of the low temperature burners oil spout are lighted a fire using air-fuel mixture, realize wall-flow type The control of CDPF catalytic converter regeneration temperatures, when delivery temperature is higher than design temperature, passes through oxidisability DOC catalysts The NO2 discharges of generation make wall-flow type CDPF catalytic converters realize passive regeneration.
Especially, the air submeter pump is used for the metering and premixing of urea and air, completes urea and accurately counts Amount.
Especially, the SCR ECUs be used for diesel engine export NOx sensor, diesel engine export exhaust temperature sensor, SCR catalytic converter inlet temperature sensor, SCR catalytic converter outlet temperature sensor, urea temperature sensor, air pressure The output signal of force snesor is handled, and calculates urea consumption, drives urea nozzle, controls NOx emission.
Especially, NOx sensor is installed before the SCR catalytic converter to gather the NOx emission of diesel engine；Described NOx sensor is installed, for calculating urea injecting quantity and NOx emission transformation efficiency, it is not necessary to diesel oil after SCR catalytic converter The original NOx emission of machine carries out Accurate Calibration, is directly tested and is demarcated in actual vehicle.
Especially, the SCR urea injection temperation of the SCR urea after-treatment system is controlled more than 220 DEG C.
The diesel engine post-processing system proposed by the present invention for meeting in-use automotive NOx and PM emission control is met with diesel engine Discharge (NOx, PM, CO, HC) limit value requirement, using SCR and DPF technologies, under the various operating conditions of diesel engine realize safety, can The emission control leaned on, realizes diesel exhaust aftertreatment PM and NOx emission Collaborative Control.The present invention need not carry out substantial amounts of Heat management is demarcated in diesel engine machine, and aftertreatment thermal management demarcation is independent, is reduced in machine and the outer coupling demarcation of machine, and mounting arrangements are simple It is single, it is easy to maintenance, it is adapted to domestic various diesel engine in-use automotive repacking post processing demands.
Brief description of the drawings
Fig. 1 is the diesel engine post-processing system knot provided in an embodiment of the present invention for meeting in-use automotive NOx and PM emission control Composition.
Embodiment
For the ease of understanding the present invention, the present invention is described more fully below with reference to relevant drawings.In accompanying drawing Give presently preferred embodiments of the present invention.But, the present invention can be realized in many different forms, however it is not limited to this paper institutes The embodiment of description.On the contrary, the purpose for providing these embodiments is made to the more thorough of the disclosure understanding Comprehensively.It should be noted that when element is referred to as " being fixed on " another element, it can directly on another element or There can also be element placed in the middle.When an element is considered as " connection " another element, it can be directly to separately One element may be simultaneously present centering elements.Unless otherwise defined, all technologies used herein and section are academic Language is identical with belonging to the implication that the those skilled in the art of the present invention are generally understood that.Herein in the description of the invention Used term is intended merely to describe the purpose of specific embodiment, it is not intended that in the limitation present invention.It is used herein Term " and/or " include the arbitrary and all combination of one or more related Listed Items.
It refer to shown in Fig. 1, Fig. 1 is the diesel oil provided in an embodiment of the present invention for meeting in-use automotive NOx and PM emission control Machine after-treatment system structure chart.
The diesel engine post-processing system that in-use automotive NOx and PM emission control is met in the present embodiment specifically includes SCR urea After-treatment system and the combustion-supporting CDPF systems of low temperature burners oil spout；The SCR urea after-treatment system is adjusted including compressed air Valve, air submeter pump 101, diesel engine outlet NOx sensor 102, diesel engine outlet exhaust temperature sensor, SCR catalyzed conversions The inlet temperature sensor of device 104, the outlet temperature sensor of SCR catalytic converter 104, urea temperature sensor, air pressure are passed Sensor, urea nozzle 103, SCR catalytic converter 104, SCR ECUs 105；The compressed air regulating valve connection air is auxiliary Help measuring pump 101；The air submeter pump 101 connects urea tank 106；Diesel engine outlet NOx sensor 102, bavin Oil machine outlet exhaust temperature sensor, the inlet temperature sensor of SCR catalytic converter 104, the outlet temperature of SCR catalytic converter 104 are passed Sensor, urea temperature sensor, air pressure probe connection SCR ECUs 105；The one end of urea nozzle 103 connection Air submeter pump 101, other end connection SCR catalytic converter 104；The combustion-supporting CDPF systems bag of low temperature burners oil spout Include compressed air air pump 107, low-voltage fuel oil pump 108, Fuel air mixing device 109, igniter plug, fuel nozzle 110, combustion chamber 111st, wall-flow type CDPF catalytic converters 112, oxidisability DOC catalysts 113, DPF ECUs 114；The compression is empty The one end of gas air pump 107 connection DPF ECUs 114, other end connection Fuel air mixing device 109；Low-voltage fuel oil pump 108 connects BOR Bunker of Redelivery air mixer 109, DPF ECUs 114；The Fuel air mixing device 109 is connected by fuel nozzle 110 to be fired Burn room 111；The connection of combustion chamber 111 diesel engine 115, oxidisability DOC catalysts 113；The oxidisability DOC catalysis turns The connection wall-flow type CDPF of parallel operation 113 catalytic converters 112；The combustion-supporting CDPF systems of low temperature burners oil spout also include fuel tank 116th, exhaust temperature sensor 117, differential pressure pickup 118.The wall-flow type CDPF catalytic converters 112 are serially connected in exhaust by flange Between pipe.
The combustion-supporting CDPF systems of the low temperature burners oil spout are lighted a fire using air-fuel mixture in this embodiment, realize wall stream The control of the regeneration temperature of formula CDPF catalytic converters 112, when delivery temperature is higher than such as 300 degree of design temperature, passes through oxidisability The NO2 discharges that DOC catalysts 113 are produced make wall-flow type CDPF catalytic converters 112 realize passive regeneration.The air is auxiliary Help measuring pump 101 to be used for the metering and premixing of urea and air, complete urea accurate measurement.The SCR ECUs 105 are used Exhaust temperature sensor, the inlet temperature of SCR catalytic converter 104 sensing are exported in exporting NOx sensor 102, diesel engine to diesel engine Device, the outlet temperature sensor of SCR catalytic converter 104, urea temperature sensor, the output signal of air pressure probe are carried out Processing, calculates urea consumption, drives urea nozzle 103, controls NOx emission.
NOx sensor is installed before the SCR catalytic converter 104 to gather the NOx emission of diesel engine 115；Described NOx sensor is installed after SCR catalytic converter 104, for calculating urea injecting quantity and NOx emission transformation efficiency, it is not necessary to right The original NOx emission of diesel engine 115 carries out Accurate Calibration, is directly tested and is demarcated in actual vehicle.After the SCR urea The SCR urea injection temperation of processing system is controlled more than 220 DEG C.Under actual road condition, sets target NOx conversion effect Rate is more than more than 70%, by target NOx conversion efficiency and actual NOx conversion efficiency, calculates urea actual ejection amount.
During work, tail gas first passes through low temperature burners+DOC and CDPF catalyzed conversions after the exhaust outlet of diesel engine 115 comes out Device, realizes the control discharged to CO, HC and PM, then by urea injection system and SCR catalytic converter 104.For current With the emission control with old vehicle, diesel engine after treatment uses oxidation catalyst technology (DOC) and particulate filter technology (CDPF) discharge capacity of reduction particulate matter (PM), hydrocarbon (HC) and carbon carbon monoxide (CO) is general technical side Case.Current in-use automotive emission control requirement, HC and CO transformation efficiencies are more than 90%, particulate matter PM reductions by 85%, NOx emission control Reduction by 70%.According to the actual raw emissions of in-use automotive, Raw exhaust temperature, arrangement size, carry out post processing carrier and Catalyst parameters are designed, and among actual vehicle operation, post processing pressure drop and temperature signal test are carried out, so as to locate after monitoring Manage running situation.Equally, in-use automotive needs to reduce NOx emission, and the SCR technology of use is more complicated, it is necessary to increase Plus urea injection system, more than 80% NOx emission can be reduced by technological transformation, technology repacking is carried out in actual vehicle When, it is necessary to which flexible install and control.When carrying out in-use automotive repacking using SCR and DPF system, relatively it is adapted to big vehicle, needs Want good reliability and low cost.
The present invention reaches that NOx and PM is arranged in in-use automotive technical foundation using low temperature burners+DOC+CDPF+SCR systems Control is put, this programme is few to diesel engine body Optimization Work amount, it is not necessary to row Bench calibration is discharged into diesel engine original, directly whole Tested on car.Technical scheme is met to be required with diesel emission (NOx, PM, CO, HC) limit value, using SCR With DPF technologies, safe and reliable emission control is realized under the various operating conditions of diesel engine, realizes and locates after diesel exhaust gas Manage PM and NOx emission Collaborative Control.The present invention need not carry out heat management in substantial amounts of diesel engine machine and demarcate, aftertreatment thermal management Demarcation is independent, with the outer coupling demarcation of machine in reduction machine, and mounting arrangements are simple, easy to maintenance, are adapted to domestic various diesel engines and exist Post processing demand is reequiped with car.
One of ordinary skill in the art will appreciate that realize all or part of flow in above-described embodiment method, being can be with The hardware of correlation is instructed to complete by computer program, described program can be stored in a computer read/write memory medium In, the program is upon execution, it may include such as the flow of the embodiment of above-mentioned each method.Wherein, described storage medium can be magnetic Dish, CD, read-only memory (Read-Only Memory, ROM) or random access memory (Random Access Memory, RAM) etc..
The technical principle of the present invention is described above in association with specific embodiment.These descriptions are intended merely to explain the present invention's Principle, and limiting the scope of the invention can not be construed in any way.Based on explanation herein, the technology of this area Personnel, which would not require any inventive effort, can associate other embodiments of the present invention, and these modes are fallen within Within protection scope of the present invention.

Claims (6)

1. a kind of diesel engine post-processing system for meeting in-use automotive NOx and PM emission control, it is characterised in that including SCR urea After-treatment system and the combustion-supporting CDPF systems of low temperature burners oil spout；The SCR urea after-treatment system is adjusted including compressed air Valve, air submeter pump, diesel engine outlet NOx sensor, diesel engine outlet exhaust temperature sensor, SCR catalytic converter entrance Temperature sensor, SCR catalytic converter outlet temperature sensor, urea temperature sensor, air pressure probe, urea spray Mouth, SCR catalytic converter, SCR ECUs；The compressed air regulating valve connects air submeter pump；The air is auxiliary Measuring pump is helped to connect urea tank；Diesel engine outlet NOx sensor, diesel engine outlet exhaust temperature sensor, SCR catalytic converter Inlet temperature sensor, SCR catalytic converter outlet temperature sensor, urea temperature sensor, air pressure probe connection SCR ECUs；Described urea nozzle one end connects air submeter pump, other end connection SCR catalytic converter；It is described low The warm combustion-supporting CDPF systems of burner oil spout include compressed air air pump, low-voltage fuel oil pump, Fuel air mixing device, igniter plug, Fuel nozzle, combustion chamber, wall-flow type CDPF catalytic converters, oxidisability DOC catalysts, DPF ECUs；The compression Air air pump one end connects DPF ECUs, other end connection Fuel air mixing device；Low-voltage fuel oil pump connects fuel-air Blender, DPF ECUs；The Fuel air mixing device connects combustion chamber by fuel nozzle；The combustion chamber connects bavin Oil machine, oxidisability DOC catalysts；The oxidisability DOC catalysts connect wall-flow type CDPF catalytic converters；It is described Wall-flow type CDPF catalytic converters are serially connected between blast pipe by flange.
2. the diesel engine post-processing system according to claim 1 for meeting in-use automotive NOx and PM emission control, its feature exists In the combustion-supporting CDPF systems of low temperature burners oil spout are lighted a fire using air-fuel mixture, realize wall-flow type CDPF catalyzed conversions Device regeneration temperature is controlled, when delivery temperature is higher than design temperature, and producing NO2 discharges by oxidisability DOC catalysts makes Wall-flow type CDPF catalytic converters realize passive regeneration.
3. the diesel engine post-processing system according to claim 1 for meeting in-use automotive NOx and PM emission control, its feature exists In the air submeter pump is used for the metering and premixing of urea and air, completes urea accurate measurement.
4. the diesel engine post-processing system according to claim 1 for meeting in-use automotive NOx and PM emission control, its feature exists In the SCR ECUs are used to export diesel engine NOx sensor, diesel engine outlet exhaust temperature sensor, SCR catalyzed conversions Device inlet temperature sensor, SCR catalytic converter outlet temperature sensor, urea temperature sensor, air pressure probe Output signal is handled, and calculates urea consumption, drives urea nozzle, controls NOx emission.
5. the diesel engine post-processing system according to claim 1 for meeting in-use automotive NOx and PM emission control, its feature exists In installing NOx sensor before the SCR catalytic converter to gather the NOx emission of diesel engine；In the SCR catalyzed conversions NOx sensor is installed, for calculating urea injecting quantity and NOx emission transformation efficiency after device, it is not necessary to NOx rows original to diesel engine Put row Accurate Calibration into, directly tested and demarcated in actual vehicle.
6. the diesel engine post-processing system for meeting in-use automotive NOx and PM emission control according to one of claim 1 to 5, Characterized in that, the SCR urea injection temperation of the SCR urea after-treatment system is controlled more than 220 DEG C.
CN201710383085.XA 2017-05-26 2017-05-26 Meet the diesel engine post-processing system of in-use automotive NOx and PM emission control Pending CN106988839A (en)

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CN201710383085.XA CN106988839A (en) 2017-05-26 2017-05-26 Meet the diesel engine post-processing system of in-use automotive NOx and PM emission control

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