CN106226085A - Diesel SCR after-treatment system exhaustor urea crystals test method - Google Patents
Diesel SCR after-treatment system exhaustor urea crystals test method Download PDFInfo
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- CN106226085A CN106226085A CN201610587105.0A CN201610587105A CN106226085A CN 106226085 A CN106226085 A CN 106226085A CN 201610587105 A CN201610587105 A CN 201610587105A CN 106226085 A CN106226085 A CN 106226085A
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- urea crystals
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 127
- 239000004202 carbamide Substances 0.000 title claims abstract description 64
- 239000013078 crystal Substances 0.000 title claims abstract description 38
- 238000010998 test method Methods 0.000 title claims abstract description 19
- 238000012360 testing method Methods 0.000 claims abstract description 64
- 235000013877 carbamide Nutrition 0.000 claims abstract description 63
- 238000002425 crystallisation Methods 0.000 claims abstract description 29
- 230000008025 crystallization Effects 0.000 claims abstract description 28
- 238000000034 method Methods 0.000 claims abstract description 19
- 238000000605 extraction Methods 0.000 claims abstract description 12
- 239000007924 injection Substances 0.000 claims abstract description 12
- 238000002347 injection Methods 0.000 claims abstract description 12
- 239000003054 catalyst Substances 0.000 claims abstract description 11
- 238000011156 evaluation Methods 0.000 claims abstract description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 11
- 239000000446 fuel Substances 0.000 claims description 6
- 238000004513 sizing Methods 0.000 claims description 4
- 239000007921 spray Substances 0.000 claims description 4
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 3
- 239000008187 granular material Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 229910000069 nitrogen hydride Inorganic materials 0.000 claims description 3
- 238000012790 confirmation Methods 0.000 claims 2
- 238000012805 post-processing Methods 0.000 abstract description 4
- 238000012827 research and development Methods 0.000 abstract description 3
- 238000011217 control strategy Methods 0.000 abstract 1
- 238000007689 inspection Methods 0.000 abstract 1
- 239000000047 product Substances 0.000 description 12
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 238000012356 Product development Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 229910021529 ammonia Inorganic materials 0.000 description 3
- 125000004122 cyclic group Chemical group 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- XLJMAIOERFSOGZ-UHFFFAOYSA-N cyanic acid Chemical compound OC#N XLJMAIOERFSOGZ-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000008450 motivation Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical class [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000011234 economic evaluation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- ZFSLODLOARCGLH-UHFFFAOYSA-N isocyanuric acid Chemical compound OC1=NC(O)=NC(O)=N1 ZFSLODLOARCGLH-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 210000002700 urine Anatomy 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses a kind of diesel SCR after-treatment system exhaustor crystallization Bench test methods.The method of the present invention comprises the following steps: P1: the selection of test engine；P2: engine hot running-in；P3: engine performance and raw emissions confirm；P4: confirm that after-treatment system is working properly, SCR aftertreatment system discharge confirms；P5:SCR system exhaust pipe crystallization trial method: test period is 3 hours, it is divided into the WHTC circulation of 1 hour and the low temperature low extraction flow limiting condition steady state test circulation of 2 hours, tests inspection SCR catalyst inside and exhaustor urea crystals situation；P6: judge whether SCR aftertreatment system crystallization trial passes through.Test method of the present invention can accurate rapid evaluation SCR aftertreatment system exhaustor urea crystals risk, the impact on crystallization of SCR catalyst mixed structure, exhaustor arrangement, carbamide injection control strategy and post processing nominal data, improving product reliability is found in SCR research and development of products early stage.
Description
Technical field
The present invention relates to a kind of diesel SCR after-treatment system exhaustor crystallization Bench test methods, the method is permissible
In R&D process, check the urea crystals situation of the SCR system of coupling rapidly, check SCR blender, carbamide injection strategy
Good and bad with demarcating, belong to engines tail gas processing system technical field.
Background technology
SCR technology is under certain engine operating condition, urea liquid in urea nozzle sprays into exhaustor, urea liquid
Occur pyrolytic reaction produce ammonia, ammonia under catalyst action with the reaction of nitrogen oxides in waste gas, reach reduce nitrogen oxidation
The purpose of thing.When spraying into a certain amount of carbamide from nozzle toward exhaustor, carbamide there occurs in exhaustor complexity physics and
Chemical reaction, including the atomization of urea droplets, broken, evaporation, the exchange of drop and exhaust energy, the catalysis reduction of nitrogen oxides
Reaction etc., along with the change of engine operation condition, the moment changes in be atomized field and the temperature field formed after carbamide injection,
Carbamide, when decomposing ammonia, also can generate the intermediate product such as cyanic acid, cyanuric acid at different row's temperature temperature, forms carbamide knot
The deposits such as brilliant calculus, deposit can constantly be accumulated, and blocks exhaustor, causes exhaust back pressure to raise, cause Fuel consumption
Amount increases and discharged nitrous oxides rises the problems such as high, electromotor limit can be caused to turn round, affect engine whole vehicle and run time serious.
Currently in order to meet diesel vehicle state four discharge standard, medium and heavy diesel vehicle substantially uses SCR post processing to reduce discharging skill
Art, but the diesel vehicle run in the market also occurs in that substantial amounts of exhaustor urea crystals phenomenon, directly influences user's
Day-to-day operation and loss economically.SCR system crystallisation problems is always the research emphasis of electromotor producer, how satisfied row
Reducing the risk of carbamide exhaustor crystallization during putting, current domestic diesel engine producer is to SCR system exhaustor urea crystals
Checking be in the most primary or that test method is relatively rough stage, it is impossible to just can the most accurately comment at product development process
Estimate the crystallization risk of SCR product, simply in market, one chassis urea crystals occurs, solve the urea crystals problem of a chassis, no
Can verify whether SCR mixed structure, the injection strategy etc. that are used exist risk up from root.
Summary of the invention
The present invention provides a kind of in the Diesel Engine Development stage, diesel SCR post processing exhaustor urea crystals test method,
Urea crystals problem whether can be there is, it is possible in time according to test at SCR product development stage accurate rapid evaluation SCR product
Result rapid Optimum product, it is to avoid product commercially occurs that urea crystals problem brings unnecessary loss.
The present invention provides a kind of diesel SCR product exhaustor urea crystals test method, comprises the following steps:
Step P1: test engine selects；
Step P2: test engine hot running-in；
Step P3: engine performance is demarcated with raw emissions；
Step P4: engine aftertreatment system discharge is demarcated；
Step P5:SCR after-treatment system exhaustor urea crystals is tested, specific as follows: the stand crystallization trial time is 3
Hour, it is divided into the WHTC circulation of 1 hour and the low temperature low extraction flow limiting condition steady state test circulation of 2 hours, test
Complete to check SCR catalyst inside and exhaustor urea crystals situation；
Step P6: at exhaustor and the crystallization content of SCR hybrid chamber, NH_3 leakage amount, the judgement of carbamide consumption be according to carbamide
No tested by SCR urea crystals；
Further, the test engine system of selection in described step P1: for a series of different models and make
Diesel engine with identical SCR system configuration, it should select minimum horsepower section, the electromotor of minimum average exhaust to tie
Brilliant test.
Further, described step P2: engine thermal break-in: before selected electromotor is carried out crystallization trial,
Hot running-in test to be carried out, makes each parts of electromotor be in optimal mated condition, the freshest catalyst converter, carry out
Heat treatment, activated catalyst activity.Method is as follows: select engine idle, the slow-speed of revolution, medium speed, high rotating speed, and load is respectively
25%, 50%, 100% load, totally 10 operating condition of test points (only one of which operating condition of test point under idling mode), each test work
Condition point runs 2 minutes, runs circulation 8 hours continuously, and described low engine speed range is 800-1300r/min, medium speed scope
For 1400-1800r/min, high engine speed range is that 1900r/min is to fixed point rotating speed.
Further, the described engine performance in step P3 and raw emissions confirm: the electromotor for sizing enters
Action edge, economy, raw emissions performance confirm, carry out external characteristics test, load-characteristic test and raw emissions examination
Testing, the most consistent with target external characteristics, load characteristic curve by contrast, raw emissions is the most in the reasonable scope, it is judged that
Whether the performance state of motivation meets exploitation requirement.
Optionally, the standard that contrast is the most consistent with target external characteristics, load characteristic curve is: require and target external characteristics
Torque deviation within ± 2%, load characteristic curve power deviation is within ± 1%.Raw emissions is in the reasonable scope
Standard is the NO of raw emissionsxDischarge deviation is within 3%, and granule PM discharge deviation is ± 0.002g/kWh.Economic Evaluation
Index is for requiring that rate of fuel consumption deviation is within ± 1g/kWh.
Optionally, the engine performance in step P3 is according to GB-T 18297-2001 " automobile engine performance test side
Method " carry out, raw emissions test is according to DB11 964-2013 " automobile-used compression-ignited, gaseous fuel spark-ignition engine and automobile
Exhaust contaminant limit value and measuring method (stand operating condition method) " carry out.
Further, described step P4: engine aftertreatment system discharge confirms: test engine is carried out post processing
System jet test, if gas and granule PM discharge meets state four emission request, and has the discharge nargin of 10%, i.e. completes really
Recognize.
Further, described step P5:SCR after-treatment system normal injection carries out WHTC cyclic test in 1 hour, and 2
Continuous jet test is carried out by 1.1 times of ammonia nitrogen ratios, the low exhaust stream of low temperature under individual hour low temperature low extraction flow limit steady state condition
Amount limit steady state condition has selected to spray temperature, the extraction flow engine operating condition less than 400kg/h.
Further, the evaluation criterion that described step P6:SCR system exhaust pipe urea crystals test is passed through is as follows:
(1) crystallization content requires≤circulates urea injecting quantity * 3%；
(2) NH3 leakage rate is less than 300ppm；
(3) carbamide actual ejection amount and fuel consumption ratio >=2%；
Meet the test of above-mentioned standard then SCR system urea crystals to pass through simultaneously.
Further, SCR system crystallization trial does not passes through, then need by optimizing SCR internal structure and carbamide injection plan
Slightly, bench test is re-started.Step P3 engine performance and raw emissions confirm not pass through or step P4 After-treatment technics
System discharge confirms, not by then assert that electromotor exists fault, to need to get rid of or change an electromotor and re-start crystallization examination
Test.
Technique scheme is it can be seen that use typical WHTC state of cyclic operation due to the present invention and there is crystallization risk
Limiting condition examines electromotor SCR aftertreatment system, therefore the invention have the advantages that
(1) present invention has only to electromotor the state of cyclic operation of continuous three hours just can be the most true on stand
Recognize whether SCR aftertreatment system exists urea crystals problem, shorten the research and development time of SCR product, be SCR product design exactly
Test basis is provided；
(2) test method of the present invention can be applied and examine it on the diesel vehicle of the different purposes such as truck, passenger vehicle
The crystallization risk of SCR aftertreatment system, the road conditions of typical WHTC operating mode closing to reality, and add limit low flow low temperature
The operating mode of amount easily crystallization, increases the low temperature Crystallization having examined SCR product；
(3) method concordance of the present invention, reproducible, beneficially product contrast and optimization design.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to
Other accompanying drawing is obtained according to these accompanying drawings.
Fig. 1 is the flow chart of the method for the invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe wholely.Obviously, described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Based on
Embodiment in the present invention, those of ordinary skill in the art obtained under not making creative work premise all other
Embodiment, broadly falls into the scope of protection of the invention.
Embodiment 1:
As it is shown in figure 1, the embodiment of the present invention provides a kind of diesel SCR after-treatment system exhaustor urea crystals test side
Method, it is possible to fast and effeciently assess the urea crystals risk of SCR product, be described in detail individually below, specifically include following
Step:
Step P1: test engine system of selection: for the diesel engine of a series of different models and use identical SCR
System configures, it should select minimum horsepower section, the electromotor of minimum average exhaust carries out crystallization trial, diesel engine and SCR
After-treatment system must complete performance discharge and demarcate, and nominal data is sizing version, it is impossible to change.During test electromotor and
All device, parts, ECU, sensor, the executors relevant with discharge, trouble light should be identical with whole vehicle state, increases
Exhaustor, blender and catalytic muffler between depressor and catalyst converter meet examination state.
Step P2: engine thermal break-in: before selected electromotor is carried out crystallization trial, hot running-in examination to be carried out
Testing, make each parts of electromotor be in optimal mated condition, the freshest catalyst converter, heat treatment to be carried out, activation is urged
Agent activity, method is as follows: select engine idle, the slow-speed of revolution, medium speed, high rotating speed, load is respectively 25%, 50%,
100% load, totally 10 operating condition of test points, each point runs 2 minutes, runs circulation 8 hours continuously.
Step P3: engine performance and raw emissions confirm: dynamic property, economy, former is carried out for the electromotor of sizing
Beginning discharge performance confirms, carries out external characteristics test, load-characteristic test and raw emissions test, outside contrasting with target
Characteristic, load characteristic curve are the most consistent, and raw emissions is the most in the reasonable scope, it is judged that the performance state of electromotor is the fullest
Foot exploitation requirement.
Step P4: engine aftertreatment system discharge confirms: demarcate adding blue pump before test, actual ejection amount and reason
Opinion emitted dose error is in the range of 3%；Testing SCR catalyst transformation efficiency, transformation efficiency meets exploitation requirement；To examination
Issue after examination and approval motivation and carry out after-treatment system jet test, confirm whether discharge meets exploitation requirement.
Step P5: the stand crystallization trial time is 3 hours, is divided into the WHTC of 1 hour to circulate and the low temperature of 2 hours
Low extraction flow limiting condition steady state test circulates, and wherein SCR aftertreatment system carries out WHTC circulation in 1 hour by normal injection
Test, the low temperature low extraction flow limiting condition steady state test circulation of 2 hours carries out continuous injection examination by 1.1 times of ammonia nitrogen ratios
Testing, low temperature low extraction flow limit steady state condition selects SCR system to play spray temperature, the extraction flow electromotor less than 400kg/h
Operating mode.
Step P6:SCR system exhaust pipe urea crystals evaluation of test result, evaluation criterion is as follows:
(1) crystallization content requires≤circulates urea injecting quantity * 3%；
(2) NH3 leakage rate is less than 300ppm；
(3) carbamide actual ejection amount and fuel consumption ratio >=2%；
It is unsatisfactory for the test of above-mentioned standard then SCR system urea crystals not pass through.
If SCR system crystallization trial does not passes through, then need by optimizing SCR internal structure and carbamide injection strategy, excellent
Bench test is re-started after change system.
The present invention describes diesel SCR after-treatment system exhaustor urea crystals test method in detail, and the method is suitable for
Medium and heavy diesel vehicle, the construction cycle is short, concordance and reproducible.Described test method can be at SCR product development process
Used by middle accurate evaluation, whether SCR catalyst mixed structure, carbamide injection strategy exist urea crystals risk, for the exploitation of product
There is provided test basis and design optimization direction, it is possible to shorten the test period of SCR product development, it is to avoid urine occurs in market in product
Element crystallization, reduces user and the loss of enterprise.
Claims (8)
1. a diesel SCR after-treatment system exhaustor urea crystals test method, it is characterised in that comprise the following steps:
Step P1: test engine selects；
Step P2: test engine hot running-in；
Step P3: engine performance confirms with raw emissions；
Step P4: engine aftertreatment system discharge confirms；
Step P5:SCR after-treatment system exhaustor urea crystals test, specific as follows: the stand crystallization trial time be 3 little
Time, it is divided into the WHTC circulation of 1 hour and the low temperature low extraction flow limiting condition steady state test circulation of 2 hours, has tested
SCR catalyst inside and exhaustor urea crystals situation is checked after one-tenth；
Step P6: at exhaustor and the crystallization content of SCR hybrid chamber, NH_3 leakage amount, the judgement of carbamide consumption be according to urea liquid
No tested by SCR urea crystals.
Diesel SCR after-treatment system exhaustor urea crystals test method the most according to claim 1, it is characterised in that:
Test engine system of selection in described step P1 is: for a series of different models and use identical SCR system
The diesel engine of configuration, selects minimum horsepower section, the electromotor of minimum average exhaust carries out crystallization trial.
Diesel SCR after-treatment system exhaustor urea crystals test method the most according to claim 1, it is characterised in that:
Engine thermal break-in method in described step P2 is: selecting engine idle, the slow-speed of revolution, medium speed, high rotating speed, load divides
Not being 25%, 50%, 100% load, totally 10 operating condition of test points, each operating condition of test point runs 2 minutes, runs circulation continuously
8 hours, described low engine speed range was 800-1300r/min, and medium speed scope is 1400-1800r/min, high engine speed range
For 1900r/min to fixed point rotating speed.
Diesel SCR after-treatment system exhaustor urea crystals test method the most according to claim 1, it is characterised in that:
The described engine performance in step P3 and raw emissions confirmation method be: carry out external characteristics test, load-characteristic test and
Raw emissions is tested, and the electromotor of sizing is carried out dynamic property, economy, raw emissions confirming performance, by outer with target special
Property, whether the contrast of target load characteristic curve consistent thus judges whether the performance state of electromotor meets exploitation requirement.
Diesel SCR after-treatment system exhaustor urea crystals test method the most according to claim 1, it is characterised in that:
Engine aftertreatment system discharge confirmation method in described step P4 is: test engine is carried out after-treatment system injection
Test, if gas and granule PM discharge meets state four emission request, and has the discharge nargin of 10%, i.e. completes to confirm.
Diesel SCR after-treatment system exhaustor urea crystals test method the most according to claim 1, it is characterised in that:
The low temperature low extraction flow limiting condition steady state test circulation of described 2 hours in step P5 is carried out by 1.1 times of ammonia nitrogen ratios
Jet test continuously, low temperature low extraction flow limit steady state condition has selected to spray temperature 200-210 DEG C, extraction flow is less than
The engine operating condition of 400kg/h.
Diesel SCR after-treatment system exhaustor urea crystals test method the most according to claim 1, it is characterised in that:
The evaluation criterion that SCR system exhaustor urea crystals test in described step P6 is passed through is as follows:
(1) crystallization content requires≤circulates urea injecting quantity * 3%；
(2) NH3 leakage rate is less than 300ppm；
(3) carbamide actual ejection amount and fuel consumption ratio >=2%；
Meet the test of above-mentioned standard then SCR system urea crystals to pass through simultaneously.
Diesel SCR after-treatment system exhaustor urea crystals test method the most according to claim 7, it is characterised in that:
SCR system crystallization trial does not passes through, then need, by optimizing SCR internal structure and carbamide injection strategy, to re-start stand examination
Test.
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| CN108595802A (en) * | 2018-04-13 | 2018-09-28 | 无锡威孚力达催化净化器有限责任公司 | SCR system urea crystals risk evaluating method based on emulation |
| CN109252929A (en) * | 2018-11-16 | 2019-01-22 | 上海歌地催化剂有限公司 | For testing the aided-detection device and its test method of ammonia uniformity |
| CN109611185A (en) * | 2018-12-18 | 2019-04-12 | 东风商用车有限公司 | The urea crystals Risk Forecast Method of Urea-SCR after-treatment system |
| CN110309534A (en) * | 2019-05-22 | 2019-10-08 | 同济大学 | A structure design method of diesel engine exhaust aftertreatment system |
| CN110530642A (en) * | 2019-09-29 | 2019-12-03 | 无锡亿利环保科技有限公司 | A kind of burner test-bed and the mixer stable state crystallization trial method based on burner |
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