CN107620620A - A kind of experimental teaching SCR motor exhaust system - Google Patents
A kind of experimental teaching SCR motor exhaust system Download PDFInfo
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- CN107620620A CN107620620A CN201710791869.6A CN201710791869A CN107620620A CN 107620620 A CN107620620 A CN 107620620A CN 201710791869 A CN201710791869 A CN 201710791869A CN 107620620 A CN107620620 A CN 107620620A
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 126
- 239000004202 carbamide Substances 0.000 claims abstract description 126
- 239000007789 gas Substances 0.000 claims abstract description 116
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 86
- 239000003054 catalyst Substances 0.000 claims abstract description 53
- 230000003197 catalytic effect Effects 0.000 claims abstract description 46
- 239000002808 molecular sieve Substances 0.000 claims abstract description 19
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000000498 cooling water Substances 0.000 claims abstract description 16
- 238000006731 degradation reaction Methods 0.000 claims abstract description 12
- 230000015556 catabolic process Effects 0.000 claims abstract description 8
- 238000002347 injection Methods 0.000 claims abstract description 8
- 239000007924 injection Substances 0.000 claims abstract description 8
- 239000013078 crystal Substances 0.000 claims abstract description 7
- 238000013461 design Methods 0.000 claims abstract description 7
- 230000000694 effects Effects 0.000 claims abstract description 7
- 238000001514 detection method Methods 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 239000008367 deionised water Substances 0.000 claims description 18
- 229910021641 deionized water Inorganic materials 0.000 claims description 18
- 238000012546 transfer Methods 0.000 claims description 18
- 239000011022 opal Substances 0.000 claims description 16
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 15
- 230000015572 biosynthetic process Effects 0.000 claims description 14
- 238000003786 synthesis reaction Methods 0.000 claims description 14
- LPSKDVINWQNWFE-UHFFFAOYSA-M tetrapropylazanium;hydroxide Chemical compound [OH-].CCC[N+](CCC)(CCC)CCC LPSKDVINWQNWFE-UHFFFAOYSA-M 0.000 claims description 14
- 238000012545 processing Methods 0.000 claims description 13
- 239000000243 solution Substances 0.000 claims description 13
- 238000009825 accumulation Methods 0.000 claims description 11
- 239000011149 active material Substances 0.000 claims description 11
- 238000004458 analytical method Methods 0.000 claims description 11
- 239000007864 aqueous solution Substances 0.000 claims description 9
- 239000013543 active substance Substances 0.000 claims description 8
- HSJPMRKMPBAUAU-UHFFFAOYSA-N cerium(3+);trinitrate Chemical compound [Ce+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O HSJPMRKMPBAUAU-UHFFFAOYSA-N 0.000 claims description 7
- 238000012544 monitoring process Methods 0.000 claims description 7
- 238000010992 reflux Methods 0.000 claims description 6
- 230000000087 stabilizing effect Effects 0.000 claims description 6
- 230000032683 aging Effects 0.000 claims description 5
- 238000013019 agitation Methods 0.000 claims description 5
- 238000000137 annealing Methods 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 238000002425 crystallisation Methods 0.000 claims description 5
- 230000008025 crystallization Effects 0.000 claims description 5
- 229910001868 water Inorganic materials 0.000 claims description 5
- 230000009102 absorption Effects 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 4
- 238000005660 chlorination reaction Methods 0.000 claims description 4
- 239000000110 cooling liquid Substances 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 238000000889 atomisation Methods 0.000 claims description 3
- 239000002826 coolant Substances 0.000 claims description 3
- 230000000593 degrading effect Effects 0.000 claims description 3
- 230000001788 irregular Effects 0.000 claims description 3
- 238000001819 mass spectrum Methods 0.000 claims description 3
- 239000013618 particulate matter Substances 0.000 claims description 3
- 238000011084 recovery Methods 0.000 claims description 3
- 238000001179 sorption measurement Methods 0.000 claims description 3
- 239000000725 suspension Substances 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 230000007935 neutral effect Effects 0.000 claims description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims 1
- 241000372132 Hydrometridae Species 0.000 claims 1
- PTVDYARBVCBHSL-UHFFFAOYSA-N copper;hydrate Chemical compound O.[Cu] PTVDYARBVCBHSL-UHFFFAOYSA-N 0.000 claims 1
- 239000001257 hydrogen Substances 0.000 claims 1
- 229910052739 hydrogen Inorganic materials 0.000 claims 1
- ZJHHPAUQMCHPRB-UHFFFAOYSA-N urea urea Chemical compound NC(N)=O.NC(N)=O ZJHHPAUQMCHPRB-UHFFFAOYSA-N 0.000 claims 1
- 239000011248 coating agent Substances 0.000 abstract description 2
- 238000000576 coating method Methods 0.000 abstract description 2
- 239000002131 composite material Substances 0.000 abstract description 2
- 238000011217 control strategy Methods 0.000 abstract description 2
- 238000011161 development Methods 0.000 abstract description 2
- 238000001027 hydrothermal synthesis Methods 0.000 abstract description 2
- 239000007787 solid Substances 0.000 abstract description 2
- 230000001052 transient effect Effects 0.000 abstract description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 26
- 229910052757 nitrogen Inorganic materials 0.000 description 13
- 239000004793 Polystyrene Substances 0.000 description 12
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 12
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 229910021529 ammonia Inorganic materials 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 238000006555 catalytic reaction Methods 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 210000002700 urine Anatomy 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 239000003814 drug Substances 0.000 description 3
- 239000003999 initiator Substances 0.000 description 3
- 238000010907 mechanical stirring Methods 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 229920002223 polystyrene Polymers 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000010453 quartz Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000003708 ampul Substances 0.000 description 2
- 239000012159 carrier gas Substances 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000008450 motivation Effects 0.000 description 2
- 238000012805 post-processing Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 1
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- ORTQZVOHEJQUHG-UHFFFAOYSA-L copper(II) chloride Chemical compound Cl[Cu]Cl ORTQZVOHEJQUHG-UHFFFAOYSA-L 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004868 gas analysis Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 230000037452 priming Effects 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- SBIBMFFZSBJNJF-UHFFFAOYSA-N selenium;zinc Chemical compound [Se]=[Zn] SBIBMFFZSBJNJF-UHFFFAOYSA-N 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 229910000314 transition metal oxide Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
Classifications
-
- 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
Landscapes
- Exhaust Gas After Treatment (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention discloses a kind of experimental teaching SCR motor exhaust system, including urea tank, air accumulator, supply metering module, catalytic muffler, cooling water system and aftertreatment control unit, the technical program proposes to use composite molecular sieve catalyst first, hydro-thermal method improves its crystal property, its catalytic activity temperature is minimum up to 120 DEG C, and nitrogen oxides degradation efficiency reaches 95%；Innovation by urea supply metering system using gas aid in by the way of, improve atomizing effect, be advantageous to optimize and reduce the coating amount of catalyst；The injection strategy that independent development DCU software and hardwares, product support open loop control strategy and client specify, can transient state amendment emitted dose, realize equipment automatization, it is integrated and intelligent；The characteristics of integrated form preprocessor uses innovative structure design, and urea consumption is low, and operation costs are low；The design of novel electron control system automatic fault detection, to ensure offer solid guarantee safe to use.
Description
Technical field
The invention belongs to motor exhaust process field, especially a kind of experimental teaching SCR engine
Exhaust system.
Background technology
Nitrogen oxides (NOx) is the general name of a variety of oxynitrides, wherein what atmospheric environment was polluted mainly includes
NO、NO2、N2O, it is one of priming factorses of air pollution problems inherent.The nitrogen oxides that the whole world is discharged into air increases year by year,
Reach more than ten million ton.Substantially there are two classes in the source of nitrogen oxides, and one kind is stationary source, is mainly derived from boiler and incinerator
The flue gas of discharge, another part come from the tail gas of the vehicle emissions such as moving source automobile and steamer.Wherein, diesel vehicle is to city
The discharge contribution of city's nitrogen oxides is quite big.How effectively to contain that diesel oil vehicle exhaust discharges, for improving urban atmosphere ring
Border plays the role of positive and important.Motor-vehicle tail-gas nitrogen oxides control technology can be divided into three major types：Control technology before machine,
Control technology and machine outer control technology (i.e. post-processing technology) in machine.
Post-processing technology is that caused nitrogen oxides is taken steps to reduce its discharge, and this is also general both at home and abroad at present
All over the method for denitration and study hotspot used.It is reduction that SCR (SCR), which refers to using ammonia, urea, CO, H2 or hydro carbons,
Agent, under conditions of oxygen concentration is higher by more than two orders of magnitude of NOx concentration, reducing agent is optionally preferentially reduced to NOx
N2Rather than and O2React.The activation energy of catalyst degradation reaction, reduces reaction temperature.At present, selected under excess oxygen
Select a kind of denitrogenation method that catalysis reduction is most future.During using ammonia as reducing agent, key reaction is：
4NH3+4NO+O2→4N2+6H2O
Ammonia-method denitration has the following disadvantages：(1) ammoniacal liquor etching apparatus；(2) ammonia easily leaks；(3) sulfuric acid is produced in reacting
Ammonium salt.Therefore ammonia process is adapted to stationary source NOx removing, and urea is safer relative to ammonia, suitable for moving source denitration.
The content of the invention
Instant invention overcomes in the prior art the shortcomings that, there is provided a kind of experimental teaching SCR engine
Exhaust system.
In order to solve the above-mentioned technical problem, the present invention is achieved by the following technical solutions：
A kind of experimental teaching SCR motor exhaust system, including urea tank, air accumulator, supply metering
Module, catalytic muffler, cooling water system and aftertreatment control unit,
Engine is connected by main gas line with catalytic muffler, and urea tank passes through urea pipe and supply metering module
It is connected, urea straightway pump is provided with urea tank, air accumulator is connected by supply air line with supply metering module, and urea is gentle
Body enters main gas line after being measured and being mixed in supplying metering module by nozzle, finally with engine caused by tail
Gas enters the adsorption treatment that catalytic muffler carries out tail gas jointly；
Wherein, described supply metering module includes gas transfer pipeline, urea return line, urea accumulation of energy pipeline, urine
Plain gas throttling pipeline, air and liquid mixer and nozzle, gas transfer pipeline are connected with air accumulator, set on gas transfer pipeline
There are air pump, two level cleaner, the first temperature sensor, baroceptor and the first magnetic valve, (urea flows back three urea pipes
Pipeline, urea accumulation of energy pipeline and urea gas throttling pipeline) it is connected with urea tank, three pipelines are divided in three Cha Fenliuguanchu
Stream, the upstream of three trouble isocons is provided with the first check valve, urea backflow Pneumatic valve, urea are provided with urea return line
Return line takes back urea tank, and the second check valve and accumulator, the connection of urea accumulation of energy pipeline are provided with urea accumulation of energy pipeline
In on gas transfer pipeline, gas throttling orifice plate is provided with urea gas throttling pipeline, from gas transfer pipeline and urine
The gas and urea of plain gas throttling pipeline are converged in air and liquid mixer, air and liquid mixer connection nozzle；
Wherein, described catalytic muffler includes, shell, inner end plate, dividing plate, catalyst carrier, blast pipe, air inlet pipe,
Inlet flange, second temperature sensor and nitrogen oxide sensor, catalytic muffler shell are in square, and one end is provided with air inlet pipe,
Air inlet pipe is connected by inlet flange with main gas line, in the place close to main gas line and the junction of inlet flange,
The nozzle of supply metering module is stretched into main gas line, and urea carries out mixing here with tail gas enters catalytic muffler jointly
Interior, the opposite side of catalytic muffler is provided with blast pipe, and the side of the inside of catalytic muffler is provided with inner end plate, on inner end plate
Dividing plate will be divided into C fonts mixed processing space inside catalytic muffler is provided with, is provided with dividing plate for placing catalysis
The catalyst carrier of agent, the both sides that catalyst carrier is arranged at dividing plate make tail gas to be carried out in mixed processing space with catalyst
Sufficient haptoreaction, is additionally provided with second temperature sensor and nitrogen oxide sensor on catalytic muffler；
Counter opal catalyst is placed with the catalyst carrier, the preparation process of the counter opal catalyst is as follows
It is described：
Step 1: molecular sieve counter opal structure is prepared using tetraethyl orthosilicate, TPAOH, deionized water as original
Material is mixed, and makes final mol ratio n (TEOS)：n(TPAOH)：N (H2O)=(1-3)：(0.1-0.5)：(100-120),
A clean beaker is taken, deionized water, TPAOH is added, tetraethyl orthosilicate is added dropwise under agitation, afterwards
PS microballoons are added, aging 24-30h, Synthesis liquid are then transferred to reactor, with 15-20 after crystallization 1.5-2h at 170-180 DEG C
DEG C/min speed is cooled to room temperature (25-30 DEG C), it is neutral then to be washed repeatedly with deionized water to gained crystal suspension
(pH6.8-7.2), at 60-70 DEG C dry, dry after 2-3h is sintered at 500-550 DEG C, and made annealing treatment so that
Molecular Sieve Morphology is changed into anti-protein structure；
Step 2: carrying active substance active material is the cerous nitrate solution that mass percent is 6-7%, catalyst is put
Enter clean beaker, add copper chloride solution and impregnate 24-30h at room temperature, the quality of active material cerous nitrate is reached step
The 5%-25% of the anti-protein structure quality synthesized in one, 1-2h is dried at 110-120 DEG C, sample is put into Muffle afterwards
Stove, 3h is calcined under the conditions of 500-550 DEG C, obtain finished product, the step is lifting the denitration ability of counter opal structure.
Wherein, described cooling water system is the system for carrying out temperature control to urea pipe using engine cooling water, from hair
Motivation starts to connect urea tank, then connects supply metering module, finally returns to engine, completes the temperature control to urea pipe, prevents
Only urea is crystallized at low temperature, and cooling liquid electromagnetic valve is provided with cooling water system；
The aftertreatment control unit includes signal processing module, power driver module, bus driver block, power module
And single-chip microcomputer, single-chip microcomputer are connected with signal processing module, power driver module, bus driver block and power module respectively, institute
State bus driver block with the engine control system to be connected, to obtain engine speed, torque signal, the power drive
Module and urea straightway pump, the first temperature sensor, second temperature sensor, baroceptor, nitrogen oxide sensor, the first electromagnetism
Valve is connected with second solenoid valve, and the aftertreatment control unit receives the signal of each sensor, controls the operating of urea straightway pump
Or stop, and magnetic valve is turned on and off.
A kind of application of experimental teaching with SCR motor exhaust system in engines tail gas disposal, is pressed
Carried out according to following step：
Step 1, SCR metering injection systems and electronic control unit carry out injection control.Urea enters from urea tank along pipeline
Enter to supply metering module, in supply metering module, through solenoid valve control jet velocity, after check valve voltage stabilizing, a part is through gas
Enter air and liquid mixer after body restricting orifice voltage stabilizing, a part enters accumulator through check valve, and a part is through urea backflow gas control
Valve is to urea return line；
Step 2, compressed air enters supply metering module from air accumulator through gas pressure regulating valve, and it is latter to produce air pressure through air pump
Part is transported to urea return line and assists urea reflux course, and another part is transported to two level cleaner, and it is empty to filter out compression
Particulate matter in gas, after pressure sensor, temperature sensor, air is ejected into gas-liquid by solenoid valve control jet velocity and mixed
In clutch, mixed with aqueous solution of urea, auxiliary improves the atomizing effect of aqueous solution of urea；
Step 3, the aqueous solution of urea after atomization mixes by nozzle with tail gas caused by engine, in catalytic muffler
Catalyst surface react, complete nitrogen oxides catalytic degradation process；
Step 4, cooling water by heat transfer caused by engine to urea tank and supplies under coolant solenoid valve control
Metering module, prevent urea from crystallizing at low temperature；
Step 5, the aftertreatment control unit (DCU) of design, the signal of all the sensors is received, control urea straightway pump
Operating stops, and all magnetic valves are turned on and off, and realization automatically controls；
Step 6, the collection and analysis of tail gas, determine vent gas treatment efficiency, using gas chromatography-mass spectrography, infrared point
Analysis etc. is qualitatively and quantitatively analyzed the tail gas system after degraded, and the molecule of each component in tail gas after degrading is determined by mass spectrum
Formula, other each component contents in tail gas are determined with reference to large-scale instruments such as XRD, Atomic absorptions, determine the degradation efficiency of nitrogen oxides
The catabolite under different degradation conditions；
Step 7, for SCR postprocessor under the conditions of irregular operating, discharge tail gas carries out Accurate Analysis, determines problem
Produce link, it is ensured that product quality；
Step 8, in system operation, carry out real-time fault detection, including to sensor, actuator, controller bus and
The monitoring and measuring of systemic-function, and faulty appearance is judged whether according to monitoring result., will be right after a certain failure is detected
The time that this failure persistently occurs carries out timing (or being counted to frequency).When the value of fail timer (or counter) exceedes
After default value (fault-tolerant time or fault-tolerant number), you can determine that this failure occurs.Such as within the fault-tolerant time, the failure vanishes,
Then fail timer (or counter) is zeroed, and failure timing (or counting) restarts.After failure is identified, set failure true
Recognize mode bit, and start fault recovery judgement.
In the inventive solutions, proposition composite molecular sieve catalyst, hydro-thermal method improve its crystal property first,
Its catalytic activity temperature is minimum up to 120 DEG C, and nitrogen oxides degradation efficiency reaches 95%；Innovation by urea supply metering system
By the way of gas auxiliary, atomizing effect is improved, is advantageous to optimize and reduces the coating amount of catalyst；Independent development DCU
The injection strategy that software and hardware, product support open loop control strategy and client specify, can transient state amendment emitted dose, can direct mistake
Cross to state five and state six and closed-loop control, realize equipment automatization, it is integrated and intelligent；Integrated form preprocessor is using innovation
Property structure design, urea consumption is low, the characteristics of operation costs are low；The design of novel electron control system automatic fault detection,
To ensure offer solid guarantee safe to use.
Brief description of the drawings
Fig. 1 is the pipeline connection diagram of exhaust treatment system in the present invention.
Fig. 2 is supply metering module pipeline jointing construction schematic diagram in the present invention.
Fig. 3 is SCR postprocessor (catalytic muffler) structural representation in the present invention.
Fig. 4 is Control testing bench device (DCU) structural representation in the present invention.
Fig. 5 is the molecular sieve counter opal catalyst SEM figures of synthesis.
Fig. 6 is the conversion rate of NOx line chart of the molecular sieve catalyst of carrying active substance.
Wherein, 1 is aftertreatment control unit, and 2 be engine, and 3 be urea tank, and 4 be cooling liquid electromagnetic valve, and 5 be supply meter
Module is measured, 6 be catalytic muffler, and 7 be gas pressure regulating valve, and 8 be air accumulator, and 9 be air pump, and 10 be two level cleaner, and 11 be first
Temperature sensor, 12 be baroceptor, and 13 be the first magnetic valve, and 14 be air and liquid mixer, and 15 be nozzle, and 16 be the second electromagnetism
Valve, 17 be the first check valve, and 18 be the second check valve, and 19 be accumulator, and 20 be urea backflow Pneumatic valve, and 21 be urea return duct
Road, 22 be gas throttling orifice plate, and 23 be three trouble isocons, and 24 be shell, and 25 be inner end plate, and 26 be dividing plate, and 27 be that catalyst carries
Body, 28 be mixed processing space, and 29 be blast pipe, and 30 be air inlet pipe, and 31 be second temperature sensor, and 32 be nitrogen oxide sensor,
33 be inlet flange, and 34 be gas exhaust piping.
Embodiment
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings：
As shown in FIG., a kind of experimental teaching SCR motor exhaust system, including urea tank, gas storage
Tank, supply metering module, catalytic muffler, cooling water system and aftertreatment control unit,
Engine is connected by main gas line with catalytic muffler, and urea tank passes through urea pipe and supply metering module
It is connected, urea straightway pump is provided with urea tank, air accumulator is connected by supply air line with supply metering module, and urea is gentle
Body enters main gas line after being measured and being mixed in supplying metering module by nozzle, finally with engine caused by tail
Gas enters the adsorption treatment that catalytic muffler carries out tail gas jointly；
Wherein, described supply metering module includes gas transfer pipeline, urea return line, urea accumulation of energy pipeline, urine
Plain gas throttling pipeline, air and liquid mixer and nozzle, gas transfer pipeline are connected with air accumulator, set on gas transfer pipeline
There are air pump, two level cleaner, the first temperature sensor, baroceptor and the first magnetic valve, (urea flows back three urea pipes
Pipeline, urea accumulation of energy pipeline and urea gas throttling pipeline) it is connected with urea tank, three pipelines are divided in three Cha Fenliuguanchu
Stream, the upstream of three trouble isocons is provided with the first check valve, urea backflow Pneumatic valve, urea are provided with urea return line
Return line takes back urea tank, and the second check valve and accumulator, the connection of urea accumulation of energy pipeline are provided with urea accumulation of energy pipeline
In on gas transfer pipeline, gas throttling orifice plate is provided with urea gas throttling pipeline, from gas transfer pipeline and urine
The gas and urea of plain gas throttling pipeline are converged in air and liquid mixer, air and liquid mixer connection nozzle；
Wherein, described catalytic muffler includes, shell, inner end plate, dividing plate, catalyst carrier, blast pipe, air inlet pipe,
Inlet flange, second temperature sensor and nitrogen oxide sensor, catalytic muffler shell are in square, and one end is provided with air inlet pipe,
Air inlet pipe is connected by inlet flange with main gas line, in the place close to main gas line and the junction of inlet flange,
The nozzle of supply metering module is stretched into main gas line, and urea carries out mixing here with tail gas enters catalytic muffler jointly
Interior, the opposite side of catalytic muffler is provided with blast pipe, and the side of the inside of catalytic muffler is provided with inner end plate, on inner end plate
Dividing plate will be divided into C fonts mixed processing space inside catalytic muffler is provided with, is provided with dividing plate for placing catalysis
The catalyst carrier of agent, the both sides that catalyst carrier is arranged at dividing plate make tail gas to be carried out in mixed processing space with catalyst
Sufficient haptoreaction, is additionally provided with second temperature sensor and nitrogen oxide sensor on catalytic muffler；
Wherein, described cooling water system is the system for carrying out temperature control to urea pipe using engine cooling water, from hair
Motivation starts to connect urea tank, then connects supply metering module, finally returns to engine, completes the temperature control to urea pipe, prevents
Only urea is crystallized at low temperature, and cooling liquid electromagnetic valve is provided with cooling water system；
The aftertreatment control unit includes signal processing module, power driver module, bus driver block, power module
And single-chip microcomputer, single-chip microcomputer are connected with signal processing module, power driver module, bus driver block and power module respectively, institute
State bus driver block with the engine control system to be connected, to obtain engine speed, torque signal, the power drive
Module and urea straightway pump, the first temperature sensor, second temperature sensor, baroceptor, nitrogen oxide sensor, the first electromagnetism
Valve is connected with second solenoid valve, and the aftertreatment control unit receives the signal of each sensor, controls the operating of urea straightway pump
Or stop, and magnetic valve is turned on and off.
A kind of application of experimental teaching with SCR motor exhaust system in engines tail gas disposal, is pressed
Carried out according to following step：
Step 1, SCR metering injection systems and electronic control unit carry out injection control.Urea enters from urea tank along pipeline
Enter to supply metering module, in supply metering module, through solenoid valve control jet velocity, after check valve voltage stabilizing, a part is through gas
Enter air and liquid mixer after body restricting orifice voltage stabilizing, a part enters accumulator through check valve, and a part is through urea backflow gas control
Valve is to urea return line；
Step 2, compressed air enters supply metering module from air accumulator through gas pressure regulating valve, and it is latter to produce air pressure through air pump
Part is transported to urea return line and assists urea reflux course, and another part is transported to two level cleaner, and it is empty to filter out compression
Particulate matter in gas, after pressure sensor, temperature sensor, air is ejected into gas-liquid by solenoid valve control jet velocity and mixed
In clutch, mixed with aqueous solution of urea, auxiliary improves the atomizing effect of aqueous solution of urea；
Step 3, the aqueous solution of urea after atomization mixes by nozzle with tail gas caused by engine, in catalytic muffler
Catalyst surface react, complete nitrogen oxides catalytic degradation process；
Step 4, cooling water by heat transfer caused by engine to urea tank and supplies under coolant solenoid valve control
Metering module, prevent urea from crystallizing at low temperature；
Step 5, the aftertreatment control unit (DCU) of design, the signal of all the sensors is received, control urea straightway pump
Operating stops, and all magnetic valves are turned on and off, and realization automatically controls；
Step 6, the collection and analysis of tail gas, determine vent gas treatment efficiency, using gas chromatography-mass spectrography, infrared point
Analysis etc. is qualitatively and quantitatively analyzed the tail gas system after degraded, and the molecule of each component in tail gas after degrading is determined by mass spectrum
Formula, other each component contents in tail gas are determined with reference to large-scale instruments such as XRD, Atomic absorptions, determine the degradation efficiency of nitrogen oxides
The catabolite under different degradation conditions；
Step 7, for SCR postprocessor under the conditions of irregular operating, discharge tail gas carries out Accurate Analysis, determines problem
Produce link, it is ensured that product quality；
Step 8, in system operation, carry out real-time fault detection, including to sensor, actuator, controller bus and
The monitoring and measuring of systemic-function, and faulty appearance is judged whether according to monitoring result., will be right after a certain failure is detected
The time that this failure persistently occurs carries out timing (or being counted to frequency).When the value of fail timer (or counter) exceedes
After default value (fault-tolerant time or fault-tolerant number), you can determine that this failure occurs.Such as within the fault-tolerant time, the failure vanishes,
Then fail timer (or counter) is zeroed, and failure timing (or counting) restarts.After failure is identified, set failure true
Recognize mode bit, and start fault recovery judgement.
In the above-mentioned technical solutions, counter opal catalyst is placed with the catalyst carrier of catalytic muffler, anti-
In the preparation of opal catalyst, PS microballoons and molecular sieve are synthesized first, using PS microballoon synthetic proteins stone structures, with the albumen
Stone structure is the molecular sieve counter opal catalyst that templated synthesis has loose structure, molecular sieve is had more preferable low temperature active
With broader temperature operating range.And by carrying active substance, the transformation efficiency of the oxides of nitrogen of molecular sieve is further improved, this is anti-
The preparation process of opal catalyst is as follows：
Embodiment 1：
Step 1: synthesis PS microballoons
Clean three-necked flask is taken, middle mouth inserts mechanical stirring device, and left mouth is used to add medicine and logical nitrogen, and right mouth connects cold
Solidifying reflux, it is 1 that volume ratio is added into three-necked flask：10 styrene and deionized water, nitrogen is being led into reaction solution
After 25min, 0.45g ammonium persulfates (initiator as styrene synthetic polystyrene) are added, continue to keep logical nitrogen, condensation
Flow back 2h；
Step 2: prepare molecular sieve counter opal structure
Mixed using tetraethyl orthosilicate, TPAOH, deionized water as raw material, make final mol ratio n
(TEOS)：n(TPAOH)：N (H2O)=1：0.18：100, a clean beaker is taken, adds deionized water, TPAOH,
Tetraethyl orthosilicate is added dropwise under agitation, adds the PS microballoons of step 1 synthesis afterwards, aging 24h then will synthesis
Liquid is transferred to reactor, is chilled to room temperature after crystallization 1.5h at 170 DEG C, is then washed to gained crystal and hanged repeatedly with deionized water
Liquid is pH6.8, is dried at 60 DEG C, 2h is sintered at 500 DEG C after drying, and made annealing treatment；
Step 3: carrying active substance
Active material is the cerous nitrate solution that mass fraction is 6.45%, and catalyst is inserted into clean beaker, adds chlorination
Copper liquor impregnates 24h at room temperature, active material quality is reached the anti-protein structure quality that is synthesized in step 2
5%, 2h is dried at 110 DEG C, sample is put into Muffle furnace afterwards, 3h is calcined under the conditions of 500 DEG C, obtains finished product.
Embodiment 2：
Step 1: synthesis PS microballoons
Clean three-necked flask is taken, middle mouth inserts mechanical stirring device, and left mouth is used to add medicine and logical nitrogen, and right mouth connects cold
Solidifying reflux, it is 1 that volume ratio is added into three-necked flask：10 styrene and deionized water, nitrogen is being led into reaction solution
After 30min, 0.5g ammonium persulfates (initiator as styrene synthetic polystyrene) are added, continue to keep logical nitrogen, condensation
Flow back 2.5h；
Step 2: prepare molecular sieve counter opal structure
Mixed using tetraethyl orthosilicate, TPAOH, deionized water as raw material, make final mol ratio n
(TEOS)：n(TPAOH)：N (H2O)=1：0.18：100, a clean beaker is taken, adds deionized water, TPAOH,
Tetraethyl orthosilicate is added dropwise under agitation, adds the PS microballoons of step 1 synthesis afterwards, aging 27h then will synthesis
Liquid is transferred to reactor, is chilled to room temperature after crystallization 1.8h at 175 DEG C, is then washed to gained crystal and hanged repeatedly with deionized water
Liquid is pH7.0, is dried at 65 DEG C, 2.5h is sintered at 525 DEG C after drying, and made annealing treatment；
Step 3: carrying active substance
Active material is the cerous nitrate solution that mass fraction is 6.45%, and catalyst is inserted into clean beaker, adds chlorination
Copper liquor impregnates 27h at room temperature, active material quality is reached the anti-protein structure quality that is synthesized in step 2
15%, 2h is dried at 110 DEG C, sample is put into Muffle furnace afterwards, 3h is calcined under the conditions of 525 DEG C, obtains finished product.
Embodiment 3：
Step 1: synthesis PS microballoons
Clean three-necked flask is taken, middle mouth inserts mechanical stirring device, and left mouth is used to add medicine and logical nitrogen, and right mouth connects cold
Solidifying reflux, it is 1 that volume ratio is added into three-necked flask：10 styrene and deionized water, nitrogen is being led into reaction solution
After 35min, 0.55g ammonium persulfates (initiator as styrene synthetic polystyrene) are added, continue to keep logical nitrogen, condensation
Flow back 3h；
Step 2: prepare molecular sieve counter opal structure
Mixed using tetraethyl orthosilicate, TPAOH, deionized water as raw material, make final mol ratio n
(TEOS)：n(TPAOH)：N (H2O)=1：0.18：100, a clean beaker is taken, adds deionized water, TPAOH,
Tetraethyl orthosilicate is added dropwise under agitation, adds the PS microballoons of step 1 synthesis afterwards, aging 30h then will synthesis
Liquid is transferred to reactor, is chilled to room temperature after crystallization 2h at 180 DEG C, is then washed repeatedly with deionized water to gained crystal suspension
For pH7.2, dried at 70 DEG C, 3h is sintered at 550 DEG C after drying, and made annealing treatment；
Step 3: carrying active substance
Active material is the cerous nitrate solution that mass fraction is 6.45%, and catalyst is inserted into clean beaker, adds chlorination
Copper liquor impregnates 30h at room temperature, active material quality is reached the anti-protein structure quality that is synthesized in step 2
25%, 2h is dried at 110 DEG C, sample is put into Muffle furnace afterwards, 3h is calcined under the conditions of 550 DEG C, obtains finished product.
Experimental result and analysis:
1. the pattern of counter opal catalyst：
Fig. 5 is the SEM pictures of the molecular sieve counter opal catalyst of synthesis, and counter opal structure is the inverse of opal structural
To structure, it is obvious cellular that the catalyst is can be seen that from SEM pictures, and close structure, quality is easy in aperture at 1-4 μm
Transmit, while can effectively lift the specific surface area and avtive spot of catalyst, be advantageous to absorption and catalytic reaction, make so as to be lifted
With efficiency, cost is reduced.
2. the active testing of counter opal catalyst：
The test carries out active survey using quartz ampoule fixed bed reactors to the counter opal catalyst prepared in embodiment
Examination, reactor mainly include air distribution system, reaction system and analysis of test system：
(1) air distribution system
The active testing of obtained catalyst is completed using simulated flue gas.Simulated flue gas includes NO, O2, N2As carrier gas
Use.NO be volume fraction 0.998% Standard Gases, N2For carrier gas；The volume fraction of nitrogen and oxygen reach 99.99% with
On.During test, the gas of each component enters quartz tube reactor after mass flowmenter after being sufficiently mixed in mixing chamber
Reacted with catalyst.Gases used parameter is tested to see the table below：
The gas parameter of denitration experiment
(2) reaction system
The counter opal catalyst prepared in embodiment is placed in reactor in quartz ampoule, heated after being passed through gas,
20-500 DEG C is detected a gas every 20 DEG C.
(3) flue gas analysis system
This experimental system is mainly to NO and NO2Measure, the equipment to simulating smoke components on-line monitoring after reaction
It is FFIR gas analyzer, spectral region 4000-650cm-1, highest resolution 0.5cm-1, detection
Device is cooled down using liquid nitrogen, 2 meters of gas cell optical length, and the slide material of gas cell window and beam splitter uses ZnSe.
Experimental result as shown in fig. 6, as can be seen from Figure when catalyst activity material load be 20% when, the anti-egg of molecular sieve
White stone catalyst transformation efficiency of the oxides of nitrogen highest, there is best low temperature active and most wide temperature operating range.Supported active thing
The very few activity of matter not enough causes molecular sieve performance bad, and load capacity can excessively influence the dispersiveness of active material, influence catalyst
Performance.
Transition metal oxide catalytic denitration material possesses higher NOx and eliminates performance, compared with precious metal catalytic material
It shows higher inoxidizability, and its application cost is low.Research shows that manganese-base oxide is answered with what other elements were formed
Closing oxide has very high catalytic activity, and the catalyst is environmentally friendly, and pollution-free and cost is cheap.Will in the present invention
Transition metal cerium is loaded in catalyst by method of chemical immersion, and the molecular sieve counter opal of made carrying active substance is urged
Agent is placed in catalytic muffler, and high conversion rate of NOx is obtained by SCR exhaust treatment systems.
The present invention is described in detail above, but the content is only presently preferred embodiments of the present invention, it is impossible to recognized
For the practical range for limiting the present invention.Any changes and modifications in accordance with the scope of the present application, all should still it return
Belong within the patent covering scope of the present invention.
Claims (2)
- A kind of 1. experimental teaching SCR motor exhaust system, it is characterised in that：Including urea tank, gas storage Tank, supply metering module, catalytic muffler, cooling water system and aftertreatment control unit,Engine is connected by main gas line with catalytic muffler, and urea tank is by urea pipe with supplying metering module phase Even, urea straightway pump is provided with urea tank, air accumulator is connected by supply air line with supply metering module, urea and gas Main gas line is entered by nozzle after being measured and being mixed in supplying metering module, finally with engine caused by tail gas The common adsorption treatment that tail gas is carried out into catalytic muffler；Wherein, described supply metering module includes gas transfer pipeline, urea return line, urea accumulation of energy pipeline, urea gas Body segment flow tube road, air and liquid mixer and nozzle, gas transfer pipeline are connected with air accumulator, and gas is provided with gas transfer pipeline Pump, two level cleaner, the first temperature sensor, baroceptor and the first magnetic valve, three urea pipes are connected with urea tank, Three pipeline is shunted in three Cha Fenliuguanchu, and the upstream of three trouble isocons is provided with the first check valve, urea return duct Urea backflow Pneumatic valve is provided with road, urea return line takes back urea tank, it is single that second is provided with urea accumulation of energy pipeline To valve and accumulator, urea accumulation of energy pipeline is connected on gas transfer pipeline, and gas is provided with urea gas throttling pipeline Restricting orifice, gas and urea from gas transfer pipeline and urea gas throttling pipeline are converged in air and liquid mixer It is poly-, air and liquid mixer connection nozzle；Wherein, described catalytic muffler includes, shell, inner end plate, dividing plate, catalyst carrier, blast pipe, air inlet pipe, air inlet Flange, second temperature sensor and nitrogen oxide sensor, catalytic muffler shell are in square, and one end is provided with air inlet pipe, air inlet Pipe is connected by inlet flange with main gas line, in the place close to main gas line and the junction of inlet flange, supply The nozzle of metering module is stretched into main gas line, and urea carries out mixing here with tail gas to be entered in catalytic muffler jointly, The opposite side of catalytic muffler is provided with blast pipe, and the side of the inside of catalytic muffler is provided with inner end plate, set on inner end plate Dividing plate will be divided into C fonts mixed processing space inside catalytic muffler is equipped with, is provided with dividing plate for placing catalyst Catalyst carrier, the both sides that catalyst carrier is arranged at dividing plate make tail gas to be filled in mixed processing space with catalyst The haptoreaction divided, is additionally provided with second temperature sensor and nitrogen oxide sensor on catalytic muffler；Counter opal catalyst is placed with the catalyst carrier, the following institute of preparation process of the counter opal catalyst State：Step 1: prepare molecular sieve counter opal structureMixed using tetraethyl orthosilicate, TPAOH, deionized water as raw material, make final mol ratio n (TEOS)： n(TPAOH)：N (H2O)=(1-3)：(0.1-0.5)：(100-120), a clean beaker is taken, add deionized water, tetrapropyl hydrogen Amine-oxides, tetraethyl orthosilicate is added dropwise under agitation, adds PS microballoons, aging 24-30h, then by Synthesis liquid afterwards Reactor is transferred to, room temperature (25-30 DEG C) is cooled to 15-20 DEG C/min speed after crystallization 1.5-2h at 170-180 DEG C, so It is neutral (pH6.8-7.2) to be washed repeatedly with deionized water afterwards to gained crystal suspension, is dried at 60-70 DEG C, after drying 2-3h is sintered at 500-550 DEG C, and is made annealing treatment so that Molecular Sieve Morphology is changed into anti-protein structure；Step 2: carrying active substanceActive material is the cerous nitrate solution that mass percent is 6-7%, and catalyst is inserted into clean beaker, adds chlorination copper water Solution impregnates 24-30h at room temperature, the quality of active material cerous nitrate is reached the anti-protein structure matter synthesized in step 1 The 5%-25% of amount, 1-2h is dried at 110-120 DEG C, sample is put into Muffle furnace afterwards, calcined under the conditions of 500-550 DEG C 3h, finished product is obtained, the step is lifting the denitration ability of counter opal structure；Wherein, described cooling water system is the system for carrying out temperature control to urea pipe using engine cooling water, from engine Start to connect urea tank, then connect supply metering module, finally return to engine, complete the temperature control to urea pipe, prevent from urinating Element is crystallized at low temperature, and cooling liquid electromagnetic valve is provided with cooling water system；The aftertreatment control unit includes signal processing module, power driver module, bus driver block, power module and list Piece machine, single-chip microcomputer are connected with signal processing module, power driver module, bus driver block and power module respectively, described total Line drive module is connected with the engine control system, to obtain engine speed, torque signal, the power driver module With urea straightway pump, the first temperature sensor, second temperature sensor, baroceptor, nitrogen oxide sensor, the first magnetic valve and Second solenoid valve is connected, and the aftertreatment control unit receives the signal of each sensor, controls the operating of urea straightway pump or stops Only, and magnetic valve is turned on and off.
- 2. a kind of application of experimental teaching with SCR motor exhaust system in engines tail gas disposal, it is special Sign is：Carry out as steps described below：Step 1, SCR metering injection systems and electronic control unit carry out injection control.Urea enters from urea tank along pipeline to be supplied To metering module, in supply metering module, through solenoid valve control jet velocity, after check valve voltage stabilizing, a part is through gas section Enter air and liquid mixer after discharge orifice plate voltage stabilizing, a part enters accumulator through check valve, and a part flows back Pneumatic valve extremely through urea Urea return line；Step 2, compressed air enters supply metering module from air accumulator through gas pressure regulating valve, and air pressure rear portion is produced through air pump It is transported to urea return line and assists urea reflux course, another part is transported to two level cleaner, filtered out in compressed air Particulate matter, after pressure sensor, temperature sensor, air is ejected into air and liquid mixer by solenoid valve control jet velocity In, mixed with aqueous solution of urea, auxiliary improves the atomizing effect of aqueous solution of urea；Step 3, the aqueous solution of urea after atomization mixes by nozzle with tail gas caused by engine, urging in catalytic muffler Agent surface reacts, and completes nitrogen oxides catalytic degradation process；Step 4, cooling water measures heat transfer caused by engine to urea tank and supply under coolant solenoid valve control Module, prevent urea from crystallizing at low temperature；Step 5, design aftertreatment control unit DCU receive all the sensors signal, control urea straightway pump operating or Stop, and all magnetic valves are turned on and off, realization automatically controls；Step 6, the collection and analysis of tail gas, vent gas treatment efficiency is determined, utilizes gas chromatography-mass spectrography, infrared analysis etc. Tail gas system after degraded is qualitatively and quantitatively analyzed, the molecular formula of each component in tail gas after degrading is determined by mass spectrum, Other each component contents in tail gas are determined with reference to large-scale instruments such as XRD, Atomic absorptions, determine the degradation efficiency of nitrogen oxides not With catabolite under degradation condition；Step 7, for SCR postprocessor under the conditions of irregular operating, discharge tail gas carries out Accurate Analysis, determines that problem produces Link, it is ensured that product quality；Step 8, in system operation, real-time fault detection is carried out, including to sensor, actuator, controller bus and system The monitoring and measuring of function, and faulty appearance is judged whether according to monitoring result., will be to this event after a certain failure is detected Hinder the time progress timing persistently occurred or frequency is counted, when the value of fail timer or counter exceedes default value After fault-tolerant time or fault-tolerant number, you can determine that this failure occurs, such as within the fault-tolerant time, the failure vanishes, then failure timing Device or counter clear, failure timing or counting restart, and after failure is identified, set fault recognition mode bit, and open Beginning fault recovery judges.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110273737A (en) * | 2019-04-10 | 2019-09-24 | 武汉理工大学 | Diesel engine post-processing system catalyst converter thermal failure fault tolerant control method and its device |
| CN116446985A (en) * | 2023-06-14 | 2023-07-18 | 山东鼎昌智能科技有限公司 | Automobile urea box capable of automatically controlling urea liquid supply |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006074836A1 (en) * | 2005-01-17 | 2006-07-20 | Robert Bosch Gmbh | Device for subsequently treating exhaust gases |
| CN102748101A (en) * | 2012-07-10 | 2012-10-24 | 天津亿利汽车环保科技有限公司 | Urea injection system for reducing NOx discharge of engine and control method thereof |
| WO2014074100A1 (en) * | 2012-11-09 | 2014-05-15 | Mack Trucks, Inc. | Method and apparatus for urea conditioning and injection control in a selective catalytic reduction system |
| CN104863672A (en) * | 2015-04-07 | 2015-08-26 | 西南交通大学 | Simple pneumatic urea dosing system |
| CN105986861A (en) * | 2015-02-10 | 2016-10-05 | 安徽艾可蓝节能环保科技有限公司 | SCR tail gas treatment system for engine |
-
2017
- 2017-09-05 CN CN201710791869.6A patent/CN107620620B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006074836A1 (en) * | 2005-01-17 | 2006-07-20 | Robert Bosch Gmbh | Device for subsequently treating exhaust gases |
| CN102748101A (en) * | 2012-07-10 | 2012-10-24 | 天津亿利汽车环保科技有限公司 | Urea injection system for reducing NOx discharge of engine and control method thereof |
| WO2014074100A1 (en) * | 2012-11-09 | 2014-05-15 | Mack Trucks, Inc. | Method and apparatus for urea conditioning and injection control in a selective catalytic reduction system |
| CN105986861A (en) * | 2015-02-10 | 2016-10-05 | 安徽艾可蓝节能环保科技有限公司 | SCR tail gas treatment system for engine |
| CN104863672A (en) * | 2015-04-07 | 2015-08-26 | 西南交通大学 | Simple pneumatic urea dosing system |
Non-Patent Citations (1)
| Title |
|---|
| 鲁逸人等: "三维仿真技术在大气污染创新实验教学的应用", 《高校实验室工作研究》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110273737A (en) * | 2019-04-10 | 2019-09-24 | 武汉理工大学 | Diesel engine post-processing system catalyst converter thermal failure fault tolerant control method and its device |
| CN116446985A (en) * | 2023-06-14 | 2023-07-18 | 山东鼎昌智能科技有限公司 | Automobile urea box capable of automatically controlling urea liquid supply |
| CN116446985B (en) * | 2023-06-14 | 2023-09-19 | 山东鼎昌智能科技有限公司 | Automobile urea box capable of automatically controlling urea liquid supply |
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