CN107191251A - A kind of diesel engine post-processing system for meeting the discharge of state six - Google Patents
A kind of diesel engine post-processing system for meeting the discharge of state six Download PDFInfo
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- CN107191251A CN107191251A CN201710384818.1A CN201710384818A CN107191251A CN 107191251 A CN107191251 A CN 107191251A CN 201710384818 A CN201710384818 A CN 201710384818A CN 107191251 A CN107191251 A CN 107191251A
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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]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
- F23G7/07—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases in which combustion takes place in the presence of catalytic material
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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
- F01N2250/00—Combinations of different methods of purification
- F01N2250/04—Combinations of different methods of purification afterburning and catalytic conversion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
- F01N2560/026—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- 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
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/04—Methods of control or diagnosing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Environmental & Geological Engineering (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The present invention discloses a kind of diesel engine post-processing system for meeting the discharge of state six, including low-temperature SCR urea after-treatment system and low temperature oil spout combustion supporting catalytic regeneration DPF system；The DPF catalyst converters and the SCR catalyst are serially connected between blast pipe using flange.The present invention is on the basis of the diesel technology of state five, the discharge standard of state six is reached using low temperature burners+DOC+CDPF+SCR systems, heat management in substantial amounts of diesel engine machine need not be carried out to demarcate, aftertreatment thermal management demarcation is independent, demarcated in reduction machine with the outer coupling of machine, system mounting arrangements are simple, easy to maintenance, are adapted to the domestic various post processing of diesel engine state six demands.
Description
Technical field
The present invention relates to Diesel Engine After-treatment Technology field, more particularly to a kind of diesel engine after treatment for meeting the discharge of state six
System.
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.Control diesel engine vent gas in nitrogen oxides and it is granular material discharged be administer urban air pollution key.Diesel engine is branch
The staple product of Chinese national economy development is supportted, annual diesel engine recoverable amount is with 18% speed increase, and environmental protection pressure is huge.Separately
On the one hand, China's Abgasgesetz is increasingly strict, and NOx emission limit is reduced to the stage of state six from the 3.5g/kW.h of National IV phase
0.4g/kW.h, NOx emission limit is reduced to the 0.01g/kW.h in the stage of state six from the 0.02g/kW.h of National IV phase.It is former
Some internal purification technology can not meet new emission request, it is necessary to increase discharge post-treatment system.From the point of view of world wide,
Reduced with SCR technology and wall flow type particle trap technology diesel engine nitrogen oxides and it is granular material discharged
Through as common recognition.From the point of view of world wide, reduced with SCR technology diesel engine discharged nitrous oxides into
For common recognition.SCR is by spraying aqueous solution of urea into tail gas, by " SCR " process, by the nitrogen oxygen in tail gas
Compound is converted into harmless nitrogen and vapor.In terms of the emission limit of diesel engine state six, discharged nitrous oxides transformation efficiency will surpass
Cross 90% transformation efficiency.However, under city driving conditions state of cyclic operation, diesel engine row's temperature is very low, is difficult to realize so high
Transformation efficiency, it is therefore desirable to be vented heat management well, improve the operating temperature of SCR catalyst, realize efficient NOx emission
Conversion.
The content of the invention
It is an object of the invention to meet the diesel engine post-processing system that state six discharges by a kind of, to solve background above
The problem of technology segment is mentioned.
For up to this purpose, the present invention uses following technical scheme：
A kind of diesel engine post-processing system for meeting the discharge of state six, it includes low-temperature SCR urea after-treatment system and low temperature
Oil spout combustion supporting catalytic regenerates DPF system；The low-temperature SCR urea after-treatment system includes urea measuring pump, urea nozzle, urea
Pipeline, SCR catalyst, NOx sensor, exhaust temperature sensor and urea system ECU；Described urea measuring pump one end connects
Connect urea box, other end connection urea nozzle；The urea nozzle connects SCR catalyst；The SCR catalyst is sensed with NOx
Device, exhaust temperature sensor connection；The NOx sensor connects urea system ECU；The urea system ECU connection
Urea box；Low temperature oil spout combustion supporting catalytic regeneration DPF system includes low temperature burners, DOC catalyst converters, CDPF catalyst converters, low
Compression ignition oil oil pump, fuel nozzle, regenerative system ECU, fuel tank, differential pressure pickup, exhaust temperature sensor and police instruction
Lamp；The low temperature burners connect regenerative system ECU by igniter；The DOC catalyst converters and low temperature burners,
CDPF catalyst converters are connected；The low-voltage fuel oil pump connects low temperature burners by fuel nozzle；The DOC catalyst converters connection
CDPF catalysts；The regenerative system ECU is connected with differential pressure pickup, exhaust temperature sensor, alarm lamp；Institute
State differential pressure pickup connection CDPF catalyst converters；The exhaust temperature sensor connection DOC catalyst converters, CDPF catalyst converters.
Especially, the DPF catalyst converters and the SCR catalyst are serially connected between blast pipe using flange.
Especially, the urea system ECU carries out feedback control to the output signal of NOx sensor, urea measuring pump
System, accurately controls urea injecting quantity.
Especially, the urea measuring pump sprays measuring pump using air-assisted urea, and it uses multiple gas-liquid mixed,
Make urea and air in measuring pump, export, pipe is interior and spout is mixed several times, it is ensured that the atomization of plain solution.
Especially, the urea nozzle has accommodating cavity, the flowing of aqueous solution of urea near spray orifice is kept, in urea impurity
Content within a preset range when still can be used.
Especially, the low-temperature SCR urea after-treatment system using the SCR for meeting the standard of state six specifically for controlling plan
Slightly, diesel engine raw emissions forecast model is set up；Set up the SCR system control strategy based on model, Stable Control Strategy, transient state
Control strategy and Correction and Control strategy；Catalyst converter NH3 concentration, storage ammonia amount and ammonia coverage rate state estimation model are set up, SCR is urged
Change device internal state and carry out real-time monitored；Based on ammonia reserves desired value and actual observed value, realize that the accurate of urea injecting quantity closes
Ring is controlled；Optimal control based on forecast model, improves NOx conversion efficiency, reduces NH3 leakage rate.
Especially, the low temperature burners include combustion chamber, and the combustion chamber is by combustion chamber, interior burning set, gas flow guiding
Mixing seat, outer burning set weld together successively；Gas flow guiding blender in the combustion chamber makes to flow through starting for combustion chamber
Tail gas is uniformly mixed with the high temperature gas flow of oil jetting combustion.
Especially, the low temperature burners have independent fuel oil injection measuring pump, compressed air pump, air-fuel mixture distribution
Device, igniting glow plug.
The diesel engine post-processing system proposed by the present invention for meeting the discharge of state six is used on the basis of the diesel technology of state five
Low temperature burners+DOC+CDPF+SCR systems reach the discharge standard of state six, it is not necessary to carry out heat management in substantial amounts of diesel engine machine
Demarcation, aftertreatment thermal management demarcation is independent, reduces in machine and the outer coupling demarcation of machine, and system mounting arrangements are simply, easy to maintenance,
It is adapted to the domestic various post processing of diesel engine state six demands.
Brief description of the drawings
Fig. 1 is the diesel engine post-processing system structure chart provided in an embodiment of the present invention for meeting the discharge of state six.
Embodiment
The invention will be further described with reference to the accompanying drawings and examples.It is understood that tool described herein
Body embodiment is used only for explaining the present invention, rather than limitation of the invention.It also should be noted that, for the ease of retouching
State, part related to the present invention rather than full content are illustrate only in accompanying drawing, it is unless otherwise defined, used herein all
Technology and scientific terminology are identical with belonging to the implication that the those skilled in the art of the present invention are generally understood that.It is used herein
Term be intended merely to describe specific embodiment, it is not intended that in limitation the present invention.
It refer to shown in Fig. 1, Fig. 1 is the diesel engine post-processing system knot provided in an embodiment of the present invention for meeting the discharge of state six
Composition.
The diesel engine post-processing system 100 that the discharge of state six is met in the present embodiment specifically includes the post processing of low-temperature SCR urea
System and low temperature oil spout combustion supporting catalytic regeneration DPF system.Specifically, the low-temperature SCR urea after-treatment system includes ureometer
Measure pump 101, urea nozzle 102, urea pipe, SCR catalyst 103, NOx sensor 104, exhaust temperature sensor 105 and urea
System electric-controlled unit 106；Described one end of urea measuring pump 101 connects urea box 107, other end connection urea nozzle 102；It is described
Urea nozzle 102 connects SCR catalyst 103；The SCR catalyst 103 is connected with NOx sensor 104, exhaust temperature sensor 105.
The connection urea system of NOx sensor 104 ECU 106；The urea system ECU 106 connects urea box 107；
Low temperature oil spout combustion supporting catalytic regeneration DPF system include low temperature burners 108, DOC catalyst converters 109, CDPF catalyst converters 110,
Low-voltage fuel oil pump 111, fuel nozzle 112, regenerative system ECU 113, fuel tank 114, differential pressure pickup 115, row's temperature
Sensor 116 and alarm lamp 117；The low temperature burners 108 connect regenerative system ECU by igniter
113；The DOC catalyst converters 109 are connected with low temperature burners 108, CDPF catalyst converters 110；The low-voltage fuel oil pump 111 passes through
Fuel nozzle 112 connects low temperature burners 108；The DOC catalyst converters 109 connect CDPF catalysts；The regenerative system
ECU 113 is connected with differential pressure pickup 115, exhaust temperature sensor 116, alarm lamp 117；The differential pressure pickup 115
Connect CDPF catalyst converters 110；The connection DOC of exhaust temperature sensor 116 catalyst converters 109, CDPF catalyst converters 110；The fuel tank
114 connection diesel engines 118, the connection low temperature burners 108 of diesel engine 118.
The DPF catalyst converters and the SCR catalyst 103 are serially connected between blast pipe using flange in the present embodiment.
The urea system ECU 106 carries out feedback control, essence to the output signal of NOx sensor 104, urea measuring pump 101
True control urea injecting quantity, solves that urea injecting quantity control stability is poor, discharge fluctuation is big, and control is delayed, and uniformity is difficult to
The problem of reaching requirement.The accuracy of spray control of urea system ECU 106, fault diagnosis fault-tolerance and anti-interference
Key performance directly determines the NOx conversion effect of low-temperature SCR urea after-treatment system.
The motor of low-temperature SCR urea after-treatment system uses " multiple-stage filtering " control strategy under different urea spray regimes,
Efficiently solve under motor speed Direct control strategy, motor is easily stuck, urea injection is interrupted, the problem of deterioration of emission is real
The motor transient rotating speed control under note operating mode in advance, spray regime, purging operating mode is showed.The urea measuring pump 101 is using empty
Gas assist type urea spray measuring pump, it uses multiple gas-liquid mixed, make urea and air in measuring pump, outlet, pipe in
And spout is mixed several times, it is ensured that the atomization of plain solution.Air-assisted urea injection measuring pump uses propulsive thrust knot
Structure check valve measuring pump is designed, and is effectively prevented and has been dissolved the urea crystals phenomenon inside pump.The urea nozzle 102, which has, to be held
Chamber is put, the crystalline impurities in a small amount of urea are persisted, the flowing of aqueous solution of urea near spray orifice is kept, in urea impurity content pre-
If still can be used when in scope.
The low-temperature SCR urea after-treatment system is specifically for using the SCR control strategies for meeting the standard of state six, setting up bavin
Oil machine raw emissions forecast model；Set up the SCR system control strategy based on model, Stable Control Strategy, transient control strategy
And Correction and Control strategy；Catalyst converter NH3 concentration, storage ammonia amount and ammonia coverage rate state estimation model are set up, to SCR catalyst 103
Internal state carries out real-time monitored；Based on ammonia reserves desired value and actual observed value, the accurate closed loop control of urea injecting quantity is realized
System；Optimal control based on forecast model, improves NOx conversion efficiency, reduces NH3 leakage rate.
The course of work of low-temperature SCR urea after-treatment system is as follows：Urea liquid is stored in urea box 107, is pacified in case
Fill temperature sensor and liquid surface position sensor detection urea liquid state.Urea liquid is after filter, subsequently into injection
Cavity volume, subsequently into urea nozzle 102, is then sprayed into blast pipe blender, unnecessary urea liquid is back to urea box
107.The overflow valve of control system pressure is also equipped with return line, urea liquid system is formed a complete time
Road.In order to keep system pressure stability, the pressure oscillation of system is reduced using pressure maintaining valve, pressure sensor and temperature are then used for
Monitoring system pressure and temperature.After urea liquid terminates injection, reversing solenoid valve is opened, and reversal valve is opened, and remains in pipeline
Urea box 107 is back in the presence of pump with the urea liquid in filter.
Low temperature oil spout combustion supporting catalytic regeneration DPF system operation principle is according to differential pressure pickup 115 before and after DPF catalyst converters
Numerical value carries out regeneration requirements judgement, when reach want regeneration value when regenerative system ECU 113 it is oily to compressed pneumatic pump, low-voltage fuel
Pump 111 is powered, and compressed air pump, low-voltage fuel oil pump 111 produce compressed air and fuel oil and pass through the fully mixed of oil-gas mixer
Close, gas-liquid mixture is transported to nozzle atomization by connecting tube and is sprayed onto in combustion chamber, and mist of oil touches igniter plug, and combustion is lighted in progress
Burn, regenerative system ECU 113 controls oil spout emitted dose that high temperature gas flow is controlled at 600 DEG C ± 20 DEG C, in actual diesel oil
, it is necessary to fuel oil injection feedforward and closed loop feedback control under machine transient condition, it is ensured that DPF catalyst converter front exhaust temperature controls reach mesh
Mark control interval.
There is the low temperature burners 108 good blast pipe independently heat up function in the present embodiment, and realization is reliably
Delivery temperature regulation control, it is ensured that DPF catalyst converters realize timely catalytic regeneration function, and under worst cold case, realize SCR
The efficient catalytic of catalyst converter 103 is converted, and by low temperature burners 108, realizes Diesel Engine Exhaust Pipe independence heat management control function, real
Efficiently control is now post-processed, avoids that the staking-out work amount that heat management in diesel engine machine brings is big, the problems such as scalar period is long is fitted
The national conditions of China are closed, after-treatment system R＆D costs is reduced, meets the demand of client.The low temperature burners 108 include combustion
Room is burnt, the combustion chamber is welded together successively by combustion chamber, interior burning set, gas flow guiding mixing seat, outer burning set；The combustion
Burn indoor gas flow guiding blender and make to flow through the motor exhaust of combustion chamber and uniformly mixed with the high temperature gas flow of oil jetting combustion.Institute
Stating low temperature burners 108 has independent fuel oil injection measuring pump, compressed air pump, air-fuel mixture distributor, igniting glow plug,
Fuel oil and air accurate measurement premixing can be realized, good air-fuel mixture is realized, it is ensured that blender can fully burn.
Present invention research tailpipe fuel oil injection DOC catalysis oxidation temperature-rise periods；Study catalysis oxygen of the soot in DPF
Change regenerative process, the premixing of research initiative regeneration Fuel Air, low-temperature ignition control process；During research passive regeneration
It is granular material discharged in the influence that CDPF intake air temperature, gas component are accumulated to PM, passive regeneration equilibrium condition and regenerative process
Difference；Set up the Pressure Drop Model of DPF system, carbon carrying capacity and estimate model, ash content estimation model；Complete DPF initiative regenerations control plan
Slightly develop.According to the characteristic of the catalyst such as DOC, DPF, SCR, arranged by studying in the machines such as injection pressure, injection advance angle, rear spray
Thermal management technology is applied and be vented, effective control in temperature field is exhausted, agricultural equipment Diesel engine delivery temperature, fuel consumption is realized
The optimum control of amount, NH3 leakage rate and urea solution consumption.Develop after-treatment system DOC+CDPF+SCR typical faults
Failure mode, probes into the failure mechanism of failure；Develop shadow of the different failure modes to discharge performance, security performance and unfailing performance
Rule is rung, is that fault diagnosis plan control strategy and threshold value setting provide foundation；Develop fault-tolerant control algorithm, failure tolerant control plan
Slightly, the pollutant discharge amount and system safety under farthest reduction malfunction are realized.
In order to meet the diesel emission limit value requirement of state six, SCR (SCR) is proved to be an effective solution
Certainly scheme.Strict demand with diesel engine to fuel consumption, it is therefore desirable to higher to NOx emission transformation efficiency, it is so right
Post-process arrangement and propose higher requirement, it is therefore desirable to the DOC catalyst converters 109 of diesel engine after treatment, DPF catalyst converters,
SCR catalyst 103 proposes higher requirement.Arranged in actual after-treatment system, SCR catalyst 103 is arranged in after DPF,
Therefore the temperature of SCR catalyst 103 is lower, has had influence on transformation efficiencies of the SCR to NOx emission.In reduction diesel particulate
In terms of discharge, generally acknowledge that maximally effective technology is particulate matter filtering technique at present.Fractions of Diesel Engine Exhaust Particulates thing trap (DPF) system
Particulate matter (black smoke) discharge of diesel engine 95% can be eliminated, PM contents in air are reduced.
Technical scheme is carried on the basis of the diesel technology of state five, using low temperature burners+DOC+CDPF+SCR
System reaches the discharge standard of state six, it is not necessary to carries out heat management in substantial amounts of diesel engine machine and demarcates, aftertreatment thermal management demarcation is only
Vertical, with the outer coupling demarcation of machine in reduction machine, system mounting arrangements are simple, easy to maintenance, are adapted to domestic various diesel engine states six
Post processing demand.
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..
Note, above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that
The invention is not restricted to specific embodiment described here, can carry out for a person skilled in the art it is various it is obvious change,
Readjust and substitute without departing from protection scope of the present invention.Therefore, although the present invention is carried out by above example
It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also
Other more equivalent embodiments can be included, and the scope of the present invention is determined by scope of the appended claims.
Claims (8)
1. a kind of diesel engine post-processing system for meeting the discharge of state six, it is characterised in that including low-temperature SCR urea after-treatment system
DPF system is regenerated with low temperature oil spout combustion supporting catalytic；The low-temperature SCR urea after-treatment system includes urea measuring pump, urea and sprayed
Mouth, urea pipe, SCR catalyst, NOx sensor, exhaust temperature sensor and urea system ECU；The urea measuring pump
One end connects urea box, other end connection urea nozzle；The urea nozzle connects SCR catalyst；The SCR catalyst with
NOx sensor, exhaust temperature sensor connection；The NOx sensor connects urea system ECU；The automatically controlled list of urea system
Member connection urea box；The low temperature oil spout combustion supporting catalytic regeneration DPF system includes low temperature burners, DOC catalyst converters, CDPF catalysis
Device, low-voltage fuel oil pump, fuel nozzle, regenerative system ECU, fuel tank, differential pressure pickup, exhaust temperature sensor and report
Alert indicator lamp；The low temperature burners connect regenerative system ECU by igniter；The DOC catalyst converters and low-temperature burning
Device, the connection of CDPF catalyst converters；The low-voltage fuel oil pump connects low temperature burners by fuel nozzle；The DOC catalyst converters connect
Connect CDPF catalysts；The regenerative system ECU is connected with differential pressure pickup, exhaust temperature sensor, alarm lamp；
The differential pressure pickup connects CDPF catalyst converters；The exhaust temperature sensor connection DOC catalyst converters, CDPF catalyst converters.
2. the diesel engine post-processing system according to claim 1 for meeting the discharge of state six, it is characterised in that the DPF is urged
Change device and the SCR catalyst is serially connected between blast pipe using flange.
3. the diesel engine post-processing system according to claim 1 for meeting the discharge of state six, it is characterised in that the Urea Series
ECU of uniting carries out feedback control to the output signal of NOx sensor, urea measuring pump, controls urea injecting quantity.
4. the diesel engine post-processing system according to claim 1 for meeting the discharge of state six, it is characterised in that the ureometer
Measure pump and measuring pump is sprayed using air-assisted urea, it uses multiple gas-liquid mixed, makes urea and air in measuring pump, goes out
Mouth, pipe are interior and spout is mixed several times, it is ensured that the atomization of plain solution.
5. the diesel engine post-processing system according to claim 1 for meeting the discharge of state six, it is characterised in that the urea spray
Mouth has an accommodating cavity, keeps the flowing of the neighbouring aqueous solution of urea of spray orifice, urea impurity content within a preset range when can still make
With.
6. the diesel engine post-processing system according to claim 1 for meeting the discharge of state six, it is characterised in that the low temperature
SCR urea after-treatment system is specifically for using the SCR control strategies for meeting the standard of state six, setting up the prediction of diesel engine raw emissions
Model；Set up the SCR system control strategy based on model, Stable Control Strategy, transient control strategy and Correction and Control strategy；Build
Vertical catalyst converter NH3 concentration, storage ammonia amount and ammonia coverage rate state estimation model, real-time monitored is carried out to SCR catalyst internal state；
Based on ammonia reserves desired value and actual observed value, the accurate closed-loop control of urea injecting quantity is realized；Optimization based on forecast model
Control, improves NOx conversion efficiency, reduces NH3 leakage rate.
7. the diesel engine post-processing system according to claim 1 for meeting the discharge of state six, it is characterised in that the low temperature combustion
Burner includes combustion chamber, and the combustion chamber is welded on successively by combustion chamber, interior burning set, gas flow guiding mixing seat, outer burning set
Together；Gas flow guiding blender in the combustion chamber makes the high temperature gas flow for the motor exhaust and oil jetting combustion for flowing through combustion chamber
Uniform mixing.
8. the diesel engine post-processing system for meeting the discharge of state six according to one of claim 1 to 7, it is characterised in that institute
Stating low temperature burners has independent fuel oil injection measuring pump, compressed air pump, air-fuel mixture distributor, igniting glow plug.
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| CN109356690A (en) * | 2018-12-14 | 2019-02-19 | 大连海事大学 | Diesel engine pollutant disposal system and method |
| CN110206623A (en) * | 2019-06-25 | 2019-09-06 | 三河市科达科技有限公司 | A kind of motor exhaust post-processing control system and control method |
| CN110953041A (en) * | 2019-12-17 | 2020-04-03 | 凯龙高科技股份有限公司 | Non-road diesel engine combustor DPF system control method |
| CN110953050A (en) * | 2019-12-17 | 2020-04-03 | 凯龙高科技股份有限公司 | Diesel engine post-processing electric control intelligent management system meeting national emission requirements |
| CN112324583A (en) * | 2020-11-05 | 2021-02-05 | 潍柴动力股份有限公司 | Cold-start warm-up control method and device |
| CN115853619A (en) * | 2023-02-17 | 2023-03-28 | 中自环保科技股份有限公司 | Combustor system suitable for diesel engine tail gas treatment in use |
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| CN115853619A (en) * | 2023-02-17 | 2023-03-28 | 中自环保科技股份有限公司 | Combustor system suitable for diesel engine tail gas treatment in use |
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