CN110426249A - The test macro and method of Multi probe sampling apparatus, ammonia mixture homogeneity - Google Patents
The test macro and method of Multi probe sampling apparatus, ammonia mixture homogeneity Download PDFInfo
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- CN110426249A CN110426249A CN201910720381.3A CN201910720381A CN110426249A CN 110426249 A CN110426249 A CN 110426249A CN 201910720381 A CN201910720381 A CN 201910720381A CN 110426249 A CN110426249 A CN 110426249A
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 136
- 239000000523 sample Substances 0.000 title claims abstract description 70
- 238000005070 sampling Methods 0.000 title claims abstract description 68
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 47
- 238000012360 testing method Methods 0.000 title claims abstract description 43
- 239000000203 mixture Substances 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title abstract description 15
- 230000007246 mechanism Effects 0.000 claims abstract description 71
- 230000001141 propulsive effect Effects 0.000 claims abstract description 30
- 230000003447 ipsilateral effect Effects 0.000 claims abstract description 4
- 229910000069 nitrogen hydride Inorganic materials 0.000 claims description 36
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 24
- 239000004202 carbamide Substances 0.000 claims description 23
- 238000010998 test method Methods 0.000 claims description 12
- 101100365087 Arabidopsis thaliana SCRA gene Proteins 0.000 claims description 7
- 101150105073 SCR1 gene Proteins 0.000 claims description 7
- 101100134054 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) NTG1 gene Proteins 0.000 claims description 7
- 230000001737 promoting effect Effects 0.000 claims description 3
- 238000004868 gas analysis Methods 0.000 claims description 2
- 239000000837 restrainer Substances 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 5
- 238000012805 post-processing Methods 0.000 abstract description 2
- 239000003054 catalyst Substances 0.000 description 16
- 238000001321 HNCO Methods 0.000 description 11
- OWIKHYCFFJSOEH-UHFFFAOYSA-N Isocyanic acid Chemical compound N=C=O OWIKHYCFFJSOEH-UHFFFAOYSA-N 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- UXKUODQYLDZXDL-UHFFFAOYSA-N fulminic acid Chemical compound [O-][N+]#C UXKUODQYLDZXDL-UHFFFAOYSA-N 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 241000264877 Hippospongia communis Species 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2247—Sampling from a flowing stream of gas
- G01N1/2252—Sampling from a flowing stream of gas in a vehicle exhaust
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/0054—Ammonia
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0062—General constructional details of gas analysers, e.g. portable test equipment concerning the measuring method or the display, e.g. intermittent measurement or digital display
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N2001/2285—Details of probe structures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N2021/3595—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using FTIR
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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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- Chemical & Material Sciences (AREA)
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Abstract
The present invention relates to diesel engine vent gas post-processing technology fields, specifically disclose a kind of Multi probe sampling apparatus, wherein include: flange, take air pipe, propulsive mechanism and driving mechanism；Flange includes flange main part and flange support portion, flange support portion is connect with the side of flange main part, at least one through-hole is provided on the side wall of the side of flange main part, an air duct fitting is respectively provided in each through-hole, each air duct fitting is all connected with a gas-guide tube, gas-guide tube and the ipsilateral setting of flange support portion, gas-guide tube passes through propulsive mechanism away from one end of air duct fitting and is fixedly connected with propulsive mechanism, driving mechanism is connect with propulsive mechanism, and every gas-guide tube is all connected with one away from one end of air duct fitting and takes air pipe.The invention also discloses the test macros and method of a kind of SCR system ammonia mixture homogeneity.Multi probe sampling apparatus provided by the invention can be improved the measuring accuracy of ammonia mixture homogeneity.
Description
Technical field
The present invention relates to diesel engine vent gas post-processing technology field more particularly to a kind of Multi probe sampling apparatus including it is somebody's turn to do
The test macro of the SCR system ammonia mixture homogeneity of Multi probe sampling apparatus and the test of SCR system ammonia mixture homogeneity
Method.
Background technique
SCR technology is by spraying into the aqueous solution of urea that can resolve into NH3 into preprocessor thus the choosing for realizing NOx
The conversion of selecting property.The uniformity coefficient that NH3 is distributed in SCR catalyst directly determines the utilization of the transformation efficiency and catalyst of NOx
Rate.At present under technical conditions, mostly uses and promote urea atomizing effect and increase urea mixer to promote being evenly distributed for NH3
Degree, and by CFD emulation mode obtain NH3 SCR catalyst end face the sex index that is evenly distributed, thus to NH3 uniformity into
Row evaluation.Ye You research institution uses after sampled point test urea penetrating is welded and fixed in the most back segment of the white carrier of SCR simultaneously
The concentration of decomposition product NH3 carrys out the NH3 uniform concentration distribution degree of Indirect evaluation SCR front end face.
But the evaluation method of the above-mentioned distribution consistency degree to NH3 concentration is since the limitation test error of technology is larger, no
It can accurately test after urea sprays into and decomposite next ammonia in the degree that is evenly distributed in SCR system air inlet section.
Summary of the invention
The present invention provides a kind of Multi probe sampling apparatus, the SCR system ammonia including the Multi probe sampling apparatus mixing
The test macro of the uniformity and the test method of SCR system ammonia mixture homogeneity solve ammonia present in the relevant technologies and exist
The low problem of the measuring accuracy of the degree that is evenly distributed in SCR system air inlet section.
As one aspect of the present invention, a kind of Multi probe sampling apparatus is provided, wherein the Multi probe sampling apparatus packet
Include: flange takes air pipe, propulsive mechanism and driving mechanism；
The flange includes flange main part and flange support portion, the flange support portion and the one of the flange main part
Side connects, and is provided at least one through-hole on the side wall of the side of the flange main part, is respectively provided with one in each through-hole
A air duct fitting, each air duct fitting are all connected with a gas-guide tube, the gas-guide tube with the flange support portion is ipsilateral sets
It sets, the gas-guide tube passes through the propulsive mechanism and fix with the propulsive mechanism away from one end of the air duct fitting to be connected
It connects, the driving mechanism is connect with the propulsive mechanism, and the every gas-guide tube connects away from one end of the air duct fitting
It connects one and takes air pipe, take air pipe that can be connected to pipeline reversing service described in every；
The driving mechanism can drive the propulsive mechanism to move along the side of the side perpendicular to the flange main part,
The movement of the propulsive mechanism is able to drive the movement of the every gas-guide tube, and each air duct fitting deviates from the air guide
One end of pipe can acquire the gas of the first rear end SCR when the gas-guide tube is mobile.
Further, the first fixed bracket and the second fixed bracket are provided on the flange support portion, described first is solid
Fixed rack is parallel with the described second fixed bracket and interval setting, and the described first fixed bracket and described second support bracket fastened is put down
Line direction is vertical with the driving direction of the driving mechanism, and driving mechanism setting is in the described first fixed bracket and described the
On two fixed brackets, and it can be pushed away along perpendicular to described in the described first fixed bracket and the second support bracket fastened direction driving
Squeeze the movement of mechanism.
Further, it is provided with the first position limiting structure on the described first fixed bracket, is arranged on the described second fixed bracket
There is the second position limiting structure, the driving mechanism is in first position-limit mechanism and the second position-limit mechanism limited range
The propulsive mechanism is driven to move.
Further, first position-limit mechanism includes the first limited block and the first fixed card, first limited block
On the described first fixed bracket, first fixed card is connect with first limited block for setting, first limited block,
First fixed card and the first fixed bracket surround the first limit hole.
Further, second position-limit mechanism includes the second limited block and the second fixed card, second limited block
On the described second fixed bracket, second fixed card is connect with second limited block for setting, second limited block,
Second fixed card and the second fixed bracket surround the second limit hole.
Further, the driving mechanism includes servo-drive hydraulic cylinder.
Further, the propulsive mechanism includes promoting flange.
As another aspect of the present invention, a kind of test macro of SCR system ammonia mixture homogeneity is provided, wherein
The test macro of the SCR system ammonia mixture homogeneity includes: SCR system, pipeline reversing service, gas analyzer, calculating
Device and previously described Multi probe sampling apparatus,
The SCR system includes sequentially connected DOC, DPF, mixing arrangement, the first SCR and the 2nd SCR, the DOC's
The first NOx sensor and the first temperature sensor is arranged in entry position, and first NOx sensor enters for detecting the DOC
The NOx concentration of mouth, first temperature sensor are used to detect the temperature value of the DOC inlet；
The second NOx sensor is arranged in the rear end of the DPF, and second NOx sensor is for detecting the rear end DPF
NOx concentration；
Urea nozzle is provided on the mixing arrangement, the jet meters system of the urea nozzle can obtain mixing dress
Set interior urea injecting quantity；
Second temperature sensor is arranged in first front end SCR, and the second temperature sensor is for detecting described first
The temperature value of the front end SCR；
The Multi probe sampling apparatus is arranged in first rear end SCR, and the Multi probe sampling apparatus can acquire described
The gas of first rear end SCR；
The pipeline reversing service is connect with the Multi probe sampling apparatus, and the pipeline reversing service can control described
The gas collecting of Multi probe sampling apparatus, and the gas that the Multi probe sampling apparatus acquires can be sent to the gas point
Analyzer；
The gas that the gas analyzer can acquire the Multi probe sampling apparatus is analyzed, and the first SCR is obtained
The each component concentration value of the gas of rear end；
Before the first SCR can be calculated according to each component concentration value of the gas of the rear end SCR in the computing device
The NH at end3Distribution consistency degree coefficient.
As another aspect of the present invention, provide a kind of using previously described SCR system ammonia mixture homogeneity
The test method of the SCR system ammonia mixture homogeneity of test macro, wherein the survey of the SCR system ammonia mixture homogeneity
Method for testing includes:
Under preset engine operating condition, Multi probe sampling apparatus under the control of pipeline reversing service to the first SCR after
The gas of multiple measuring points at end carries out duration acquisition, obtains the gas of each measuring point；
Gas analyzer analyzes the gas of each measuring point respectively, obtains each component concentration of the gas of each measuring point
Value；
Computing device is equal according to the distribution for the NH3 that the front end SCR1 is calculated in each component concentration value of the gas of multiple measuring points
Evenness coefficient.
Further, the test method of the SCR system ammonia mixture homogeneity further include the computing device according to
The each component concentration value of the gas of multiple measuring points carries out before the step of distribution consistency degree coefficient of the NH3 of the front end SCR1 is calculated
:
Various acquisition device is under the control of pipeline reversing service to the gas weight of at least four measuring points of the first rear end SCR
New acquisition, obtains the gas of each measuring point；
The freshly harvested each measuring point gas of gas analyzer counterweight is analyzed respectively, each measuring point resurveyed
Gas each component concentration value；
Computing device is collected corresponding by each component concentration value of the gas of each measuring point resurveyed and first time
Measuring point gas each component concentration value carry out difference calculating；
If difference is in default error range, computing device executes subsequent step.
By above-mentioned Multi probe sampling apparatus, at least one gas-guide tube is set, can be realized the gas to the first rear end SCR
Multipoint acquisition, and by the structure of above-mentioned Multi probe sampling apparatus may be implemented vertically to install, be transversely mounted, or with first
SCR can occupy little space in this way and can acquire the gas on the first rear end SCR to the greatest extent at the installation of any angle
Body, when the Multi probe sampling apparatus is applied in the test macro of SCR system ammonia mixture homogeneity, due to the more than enough test of energy
Point collects gas, so as to improve the measuring accuracy of ammonia mixture homogeneity.
Detailed description of the invention
The drawings are intended to provide a further understanding of the invention, and constitutes part of specification, with following tool
Body embodiment is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the axonometric drawing of Multi probe sampling apparatus provided by the invention.
Fig. 2 is the main view of Multi probe sampling apparatus provided by the invention.
Fig. 3 is the structural schematic diagram of the test macro of SCR system ammonia mixture homogeneity provided by the invention.
Fig. 4 is the connection signal of Multi probe sampling apparatus provided by the invention and pipeline reversing service and gas analyzer
Figure.
Specific embodiment
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combine.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
In order to make those skilled in the art more fully understand the present invention program, below in conjunction with attached in the embodiment of the present invention
Figure, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only this
The embodiment of a part is invented, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, should fall within the scope of the present invention.
It should be noted that description and claims of this specification and term " first " in above-mentioned attached drawing, "
Two " etc. be to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should be understood that using in this way
Data be interchangeable under appropriate circumstances, so as to the embodiment of the present invention described herein.In addition, term " includes " and " tool
Have " and their any deformation, it is intended that cover it is non-exclusive include, for example, containing a series of steps or units
Process, method, system, product or equipment those of are not necessarily limited to be clearly listed step or unit, but may include without clear
Other step or units listing to Chu or intrinsic for these process, methods, product or equipment.
It should be noted oxidation catalyst (Diesel Oxidation Catalyst, abbreviation DOC), selectivity
Catalyst reduction catalyst device (Selective Catalytic Reduction, abbreviation SCR), grain catcher (Diesel
Particulate Filter, abbreviation DPF).
Before the test for realizing ammonia mixture homogeneity, first the test philosophy of realization ammonia mixing uniformity is carried out detailed
It describes in detail bright.
Uniformity coefficient NH is mixed using ammonia in industry at present3_ UI evaluates the NH at SCR catalyst entrance section3Distribution is equal
Even degree.SCR catalyst entrance section is such as divided into several face units, then NH3The calculation formula of _ UI is as follows:
Wherein, NH3_ UI indicates that ammonia is uniformly mixed property coefficient, and A indicates carrier sectional area, AiIndicate unit i area, miIt indicates
Unit i axial direction NH3Concentration,Indicate average NH3Concentration.
According to calculation formula, it is only necessary to test the NH of limited elemental area on SCR catalyst entrance section3Concentration, i.e.,
The NH of entire entrance section can be obtained3_UI.But due to the complexity that SCR catalyst entrance section overdraught and urea are distributed,
Using the NH for directly testing SCR inlet section3Concentration has difficulties.Since SCR catalyst carrier is ceramic honey comb, to air-flow and
Gas component has good rectified action, therefore air flow method and NH on the exit face of the first SCR3It is distributed highly stable.
Therefore, the NH in SCR inlet section is extrapolated indirectly in such a way that measuring point is set on the first outlet SCR3Concentration is more
Good selection.
After aqueous solution of urea sprays into mixer, heat solution is issued in high temperature and catalyst action and and is hydrolyzed, generation product
Mainly HNCO, NH3And CO2, it is as follows to chemically react formula:
(NH2)2CO=> HCNO+NH3,
HCNO+H2O=> NH3+CO2。
But if in the lower situation of delivery temperature, urea, which decomposes, may not exclusively generate other complicated chemical products
Even generate crystalline solid.But these complicated products are to test NH3Distributing homogeneity do not influence, can not have to consider.Urea
Decompose the NH generated3Under the effect of the catalyst with a series of chemical reaction of NOx in tail gas, the product of generation is more multiple
It is miscellaneous.Two kinds of main chemical reactions are temporarily only considered herein.That is fast response and standard reaction, reaction formula are as follows:
Standard SCR:4NH3+4NO+O2=4N2+6H2O,
Fast SCR:4NH3+2NO+2NO2=4N2+6H2O。
It can be seen that NH needed for converting NOx from reaction formula3Molal quantity and NOx molal quantity are 1:1.It therefore can be by
The NH in the first downstream SCR3Amount of leakage+required NH is reacted with NOx3Amount+be not hydrolyzed into NH3HNCO meter calculate upstream NH3
Theoretical value.Calculation formula is as follows:
NH3, usSCR=NH3, UI Flange+(NOX, usSCR-NOX, UI Flange)+HNCO,
Wherein, NH3,UI FlangeIndicate the NH that Multi probe sampling apparatus measures3Concentration, NOx,usSCRNOx before indicating SCR
Concentration (can be obtained) by NOx sensor after DPF, NOx,UI FlangeIndicate the NOx concentration that Multi probe sampling apparatus measures, HNCO table
Show the HNCO concentration that Multi probe sampling apparatus measures.
Herein, NH3,UI FlangeFor the NH measured at the more probe sampling device3Concentration and the first SCR have not reacted
NH3。NOx,usSCRFor the NOx concentration before the first SCR, NOx sensor can be measured after DPF.But the NOx concentration before the first SCR
Distribution is influenced by mixer to a certain extent, therefore, when air-flow is when the first SCR front end face distributes very evenly, can be considered
NOx before first SCR is substantially uniformity distribution, and NOx sensor measured value calculates after can directlying adopt DPF.
In order to realize to NH3Concentration, NOx concentration and HNCO concentration acquisition, provide one kind in the present embodiment
Multi probe sampling apparatus, Fig. 1 and Fig. 2 are axonometric drawing and the master of the Multi probe sampling apparatus provided according to embodiments of the present invention respectively
View, as depicted in figs. 1 and 2, comprising: flange 5-1, take air pipe 5-6, propulsive mechanism 5-4 and driving mechanism 5-7；
The flange 5-1 include flange main part 5-101 and flange support portion 5-102, the flange support portion 5-102 with
The side of the flange main part 5-101 connects, and is provided at least one on the side wall of the side of the flange main part 5-101
Through-hole is respectively provided with air duct fitting a 5-2, each air duct fitting 5-2 in each through-hole and is all connected with a gas-guide tube
The ipsilateral setting of 5-3, the gas-guide tube 5-3 and the flange support portion 5-102, the gas-guide tube 5-3 connect away from the gas-guide tube
One end of head 5-2 passes through the propulsive mechanism 5-4 and is fixedly connected with the propulsive mechanism 5-4, the driving mechanism 5-7 and institute
Propulsive mechanism 5-4 connection is stated, the every gas-guide tube 5-3 is all connected with one away from one end of the air duct fitting 5-2 and takes gas
Pipeline 5-6 takes air pipe 5-6 that can be connected to pipeline reversing service described in every；
The driving mechanism 5-7 can drive the propulsive mechanism 5-4 along perpendicular to the one of the flange main part 5-101
Side's movement of side, the movement of the propulsive mechanism 5-4 are able to drive the movement of the every gas-guide tube 5-3, each air guide
Pipe fitting 5-2 can acquire the first rear end SCR away from one end of the gas-guide tube 5-3 when the gas-guide tube 5-3 is mobile
Gas.
By above-mentioned Multi probe sampling apparatus, at least one gas-guide tube is set, can be realized the gas to the first rear end SCR
Multipoint acquisition, and by the structure of above-mentioned Multi probe sampling apparatus may be implemented vertically to install, be transversely mounted, or with first
SCR can occupy little space in this way and can acquire the gas on the first rear end SCR to the greatest extent at the installation of any angle
Body, when the Multi probe sampling apparatus is applied in the test macro of SCR system ammonia mixture homogeneity, due to the more than enough test of energy
Point collects gas, so as to improve the measuring accuracy of ammonia mixture homogeneity.
Specifically, in order to realize the support to driving mechanism 5-7, it is solid that first is provided on the flange support portion 5-102
The fixed bracket 5-9 of fixed rack 5-8 and second, the described first fixed bracket 5-8 is parallel with the described second fixed bracket 5-9 and is spaced
Setting, the drive of the parallel direction and the driving mechanism 5-7 of the described first fixed bracket 5-8 and the second fixed bracket 5-9
Dynamic direction is vertical, and the driving mechanism 5-7 setting is fixed on bracket 5-9 in the described first fixed bracket 5-8 and described second, and
The extruding mechanism 5-4 can be driven along the direction perpendicular to the described first fixed bracket 5-8 and the second fixed bracket 5-9
Movement.
Further, in order to realize the support to driving mechanism 5-7, first is provided on the described first fixed bracket 5-8
Position limiting structure is provided with the second position limiting structure on the second fixed bracket 5-9, and the driving mechanism 5-7 is in first limit
The driving propulsive mechanism 5-4 movement in position mechanism and the second position-limit mechanism limited range.
Preferably, first position-limit mechanism includes the first limited block 5-12 and the first fixed card 5-10, and described first
On the described first fixed bracket 5-8, the first fixed card 5-10 and the first limited block 5-12 connect for limited block setting
It connects, the first limited block 5-12, the first fixed card 5-10 and the first fixed bracket 5-8 surround the first limit hole.
Preferably, second position-limit mechanism includes the second limited block 5-13 and the second fixed card 5-11, and described second
Limited block 5-13 setting is on the described second fixed bracket 5-9, the second fixed card 5-11 and the second limited block 5-
13 connections, the second limited block 5-13, the second fixed card 5-11 and the second fixed bracket 5-9 surround the second limit
Hole.
It is understood that first limit hole is parallel with second limit hole and is correspondingly arranged, the driving machine
Structure 5-7 can drive the movement of the propulsive mechanism 5-4 after first limit hole and second limit hole, and described
Driving mechanism 5-7 is vertically arranged with the propulsive mechanism 5-4.
Preferably, the driving mechanism 5-7 includes servo-drive hydraulic cylinder.
It should be noted that realizing the driving to propulsive mechanism by servo-drive hydraulic cylinder, the choosing of measuring point is enabled to
It selects very flexibly, all focus can be covered substantially.
Preferably, the propulsive mechanism 5-4 includes promoting flange.
Preferably, as depicted in figs. 1 and 2, the present embodiment is by taking 6 gas-guide tubes as an example.It should be understood that considering air guide
After the fixed dimension of the size of pipe, air flow method and flange, using 6 gas-guide tubes can reach on air flow method influence it is small and
It can be realized the purpose of multiple measuring points.
It should be noted that Multi probe sampling apparatus is fixed by flange installation in the present embodiment, it is easily installed and dismantles,
It can be used repeatedly in different schemes, disparity items.
As another embodiment of the present invention, a kind of test macro of SCR system ammonia mixture homogeneity is provided, wherein
As shown in figure 3, the test macro of the SCR system ammonia mixture homogeneity includes: SCR system, pipeline reversing service Switch
Box, gas analyzer FTIR, computing device and previously described Multi probe sampling apparatus 5,
The SCR system includes sequentially connected DOC, DPF, mixing arrangement Mixer, the first SCR and the 2nd SCR, described
The first NOx sensor and the first temperature sensor is arranged in the entry position 1 of DOC, and first NOx sensor is described for detecting
The NOx concentration of DOC inlet, first temperature sensor are used to detect the temperature value of the DOC inlet；
The second NOx sensor is arranged in the rear end 2 of the DPF, and second NOx sensor is for detecting the rear end DPF
NOx concentration；
Urea nozzle 3 is provided on the mixing arrangement Mixer, the jet meters system of the urea nozzle 3 can obtain
Obtain the urea injecting quantity in mixing arrangement；
Second temperature sensor is arranged in first front end SCR 4, and the second temperature sensor is for detecting described first
The temperature value of the front end SCR；
The Multi probe sampling apparatus 5 is arranged in first rear end SCR, and the Multi probe sampling apparatus 5 can acquire institute
State the gas of the first rear end SCR；
The pipeline reversing service Switch Box is connect with the Multi probe sampling apparatus 5, the pipeline reversing service
Switch Box can control the gas collecting of the Multi probe sampling apparatus 5, and can adopt the Multi probe sampling apparatus 5
The gas of collection is sent to the gas analyzer FTIR；
The gas that the gas analyzer FTIR can acquire the Multi probe sampling apparatus 5 be analyzed, and obtain the
The each component concentration value of the gas of one rear end SCR；
Before the first SCR can be calculated according to each component concentration value of the gas of the rear end SCR in the computing device
The NH at end3Distribution consistency degree coefficient.
By the test macro of above-mentioned SCR system ammonia mixture homogeneity, due to using Multi probe sampling cartridge above
It sets, the more than enough test point of energy collects gas, so as to improve the measuring accuracy of ammonia mixture homogeneity.
As shown in figure 3, installing SCR system on engine pedestal.And the oneth NOx is installed in clarifier DOC inlet position 1
Sensor and the first temperature sensor test the NOx concentration and inlet temperature of SCR system entrance.Pacify in DPF back-end location 2
Fill the NO of the second NOx sensor measurement rear end DPFX, usSCR.Urea is obtained by jet meters system at urea nozzle position 3
The amount of injection, while confirming whether urea injecting quantity is consistent with ECU calibration value.Second temperature is installed at the first SCR front position 4
Sensor, the temperature value for monitoring whether to have reached surveyed operating condition.Multi probe is installed in the position 10mm after the first SCR of catalyst
Sampling apparatus 5,6 probe tubes of arranging on Multi probe sampling apparatus 5 take for carrying out gas on the specific position of place section
Sample.Multi probe sampling apparatus 5 connecting line switching device Switch Box, pipeline reversing service Switch Box and gas analysis
Instrument FTIR carries out signal transmission, and gas analyzer FTIR is used to test NOx, NH in gas sample3、N2The components such as O and HNCO it is dense
Degree.The NO that discharges pollutants after the first SCR in end section can directly be testedx,UI FlangeAnd N2O and urea decomposition product
NH3,UI FlangeWith the concentration value of HNCO.
Multi probe sampling apparatus 5 according to the size of SCR catalyst carrier customize, should use up more than setting test point, one
As on the first outlet SCR arrange 30~50 test points, as shown in Figure 4.
Start engine, engine operating condition is adjusted to required operating condition, including revolving speed, torque, former row NOx.Multi probe is adopted
Sampling device 5 moves to carrier center point and carries out data monitoring, steady to the data such as temperature, flow, urea injection before revolving speed, torque, SCR
After fixed, a probe in Multi probe sampling apparatus 5 is moved into test point 1, again after stable 2min, measures NOx, NH3、N2O and
The concentration value of HNCO, time of measuring 30s take its average value as the concentration value of each component；Then it successively measures subsequent
Measuring point.After having surveyed all measuring points, then repetition measurement point 1,2,3,4, compared with first measured value, if error is less than 10%, then it is assumed that institute
Test data is surveyed to meet the requirements；If error is greater than 10%, 10min is waited, again repetition measurement, until meeting the requirements.It will be
Each measuring point NOx, NH that first rear end SCR measures3、N2O, the concentration value of HNCO is converted to the NH3 that SCR1 front end face corresponds to measuring point
Concentration value.Calculation formula is as follows:
NH3, usSCR=NH3, UI Flange+(NOX, usSCR-NOX, UI Flange)+HNCO,
The NH of the first SCR front end face is thus obtained3Concentration Distribution value, then uniformity formula is mixed using ammonia:
It calculates ammonia and mixes uniformity NH3The numerical value of _ UI, NH on as the first SCR front end face3Distribution consistency degree coefficient.
As another embodiment of the present invention, provide a kind of using previously described SCR system ammonia mixture homogeneity
The test method of the SCR system ammonia mixture homogeneity of test macro, wherein the survey of the SCR system ammonia mixture homogeneity
Method for testing includes:
Under preset engine operating condition, Multi probe sampling apparatus under the control of pipeline reversing service to the first SCR after
The gas of multiple measuring points at end carries out duration acquisition, obtains the gas of each measuring point；
Gas analyzer analyzes the gas of each measuring point respectively, obtains each component concentration of the gas of each measuring point
Value；
Computing device is equal according to the distribution for the NH3 that the front end SCR1 is calculated in each component concentration value of the gas of multiple measuring points
Evenness coefficient.
The test method of the SCR system ammonia mixture homogeneity further includes in the computing device according to multiple measuring points
The each component concentration value of gas, which is calculated, to carry out before the step of distribution consistency degree coefficient of the NH3 of the front end SCR1:
Various acquisition device is under the control of pipeline reversing service to the gas weight of at least four measuring points of the first rear end SCR
New acquisition, obtains the gas of each measuring point；
The freshly harvested each measuring point gas of gas analyzer counterweight is analyzed respectively, each measuring point resurveyed
Gas each component concentration value；
Computing device is collected corresponding by each component concentration value of the gas of each measuring point resurveyed and first time
Measuring point gas each component concentration value carry out difference calculating；
If difference is in default error range, computing device executes subsequent step.
By the test method of above-mentioned SCR system ammonia mixture homogeneity, due to using Multi probe sampling cartridge above
It sets, the more than enough test point of energy collects gas, so as to improve the measuring accuracy of ammonia mixture homogeneity.
The specific work process of test method about SCR system ammonia mixture homogeneity is referred to SCR system above
The description of the test macro of system ammonia mixture homogeneity, details are not described herein again.
The test method and test macro of SCR system ammonia mixture homogeneity provided by the invention, directly pass through engine
Rack is tested, and emission of substance is as a result more accurate closer to vehicle operating condition；And sampling Multi probe sampling apparatus, Neng Goubian
Setting angle is changed, and can utmostly increase test point in end section after the first SCR, test point shown in Fig. 4 is 46
It is a.
It is understood that the principle that embodiment of above is intended to be merely illustrative of the present and the exemplary implementation that uses
Mode, however the present invention is not limited thereto.For those skilled in the art, essence of the invention is not being departed from
In the case where mind and essence, various changes and modifications can be made therein, these variations and modifications are also considered as protection scope of the present invention.
Claims (10)
1. a kind of Multi probe sampling apparatus, which is characterized in that the Multi probe sampling apparatus includes: flange, takes air pipe, promotes
Mechanism and driving mechanism；
The flange includes flange main part and flange support portion, the side company of the flange support portion and the flange main part
It connects, at least one through-hole is provided on the side wall of the side of the flange main part, one is respectively provided in each through-hole and leads
Gas-tpe fitting, each air duct fitting are all connected with a gas-guide tube, the gas-guide tube and the ipsilateral setting of flange support portion, institute
Gas-guide tube is stated to pass through the propulsive mechanism away from one end of the air duct fitting and be fixedly connected with the propulsive mechanism, it is described
Driving mechanism is connect with the propulsive mechanism, and the every gas-guide tube is all connected with one away from one end of the air duct fitting and takes
Air pipe takes air pipe that can be connected to pipeline reversing service described in every；
The driving mechanism can drive the propulsive mechanism to move along the side of the side perpendicular to the flange main part, described
The movement of propulsive mechanism is able to drive the movement of the every gas-guide tube, and each air duct fitting is away from the gas-guide tube
One end can acquire the gas of the first rear end SCR when the gas-guide tube is mobile.
2. Multi probe sampling apparatus according to claim 1, which is characterized in that be provided with first on the flange support portion
Fixed bracket and the second fixed bracket, the described first fixed bracket is parallel with the described second fixed bracket and is spaced setting, described
First fixed bracket and the second support bracket fastened parallel direction are vertical with the driving direction of the driving mechanism, the driving
Mechanism setting can fix bracket along perpendicular to described first on the described first fixed bracket and the second fixed bracket
The movement of the extruding mechanism is driven with the described second support bracket fastened direction.
3. Multi probe sampling apparatus according to claim 2, which is characterized in that be provided with the on the first fixed bracket
One position limiting structure is provided with the second position limiting structure on the second fixed bracket, and the driving mechanism is in first position restrainer
The driving propulsive mechanism movement in structure and the second position-limit mechanism limited range.
4. Multi probe sampling apparatus according to claim 3, which is characterized in that first position-limit mechanism includes the first limit
Position block and the first fixed card, the first limited block setting on the described first fixed bracket, first fixed card with
The first limited block connection, first limited block, the first fixed card and the first fixed bracket surround the first limit
Hole.
5. Multi probe sampling apparatus according to claim 3, which is characterized in that second position-limit mechanism includes the second limit
Position block and the second fixed card, the second limited block setting on the described second fixed bracket, second fixed card with
The second limited block connection, second limited block, the second fixed card and the second fixed bracket surround the second limit
Hole.
6. Multi probe sampling apparatus as claimed in any of claims 1 to 5, which is characterized in that the driving mechanism
Including servo-drive hydraulic cylinder.
7. Multi probe sampling apparatus as claimed in any of claims 1 to 5, which is characterized in that the propulsive mechanism
Including promoting flange.
8. a kind of test macro of SCR system ammonia mixture homogeneity, which is characterized in that the SCR system ammonia is uniformly mixed
The test macro of degree includes: any in SCR system, pipeline reversing service, gas analyzer, computing device and claim 1 to 7
Multi probe sampling apparatus described in one,
The SCR system includes sequentially connected DOC, DPF, mixing arrangement, the first SCR and the 2nd SCR, the entrance of the DOC
The first NOx sensor and the first temperature sensor is arranged in position, and first NOx sensor is for detecting the DOC inlet
NOx concentration, first temperature sensor are used to detect the temperature value of the DOC inlet；
The second NOx sensor is arranged in the rear end of the DPF, and second NOx sensor is used to detect the NOx of the rear end DPF
Concentration；
Urea nozzle is provided on the mixing arrangement, the jet meters system of the urea nozzle can obtain in mixing arrangement
Urea injecting quantity；
Second temperature sensor is arranged in first front end SCR, and the second temperature sensor is for before detecting the first SCR
The temperature value at end；
The Multi probe sampling apparatus is arranged in first rear end SCR, and the Multi probe sampling apparatus can acquire described first
The gas of the rear end SCR；
The pipeline reversing service is connect with the Multi probe sampling apparatus, and the pipeline reversing service can control more spies
The gas collecting of head sampling apparatus, and the gas that the Multi probe sampling apparatus acquires can be sent to the gas analysis
Instrument；
The gas that the gas analyzer can acquire the Multi probe sampling apparatus is analyzed, and the first rear end SCR is obtained
Gas each component concentration value；
The first front end SCR can be calculated according to each component concentration value of the gas of the rear end SCR in the computing device
NH3Distribution consistency degree coefficient.
9. a kind of SCR system ammonia of test macro using SCR system ammonia mixture homogeneity according to any one of claims 8 mixes
The test method of the uniformity, which is characterized in that the test method of the SCR system ammonia mixture homogeneity includes:
Under preset engine operating condition, Multi probe sampling apparatus is under the control of pipeline reversing service to the first rear end SCR
The gas of multiple measuring points carries out duration acquisition, obtains the gas of each measuring point；
Gas analyzer analyzes the gas of each measuring point respectively, obtains each component concentration value of the gas of each measuring point；
The distribution consistency degree of the NH3 of the front end SCR1 is calculated according to each component concentration value of the gas of multiple measuring points for computing device
Coefficient.
10. the test method of SCR system ammonia mixture homogeneity according to claim 9, which is characterized in that the SCR
The test method of system ammonia mixture homogeneity further includes dense according to each component of the gas of multiple measuring points in the computing device
Angle value, which is calculated, to be carried out before the step of distribution consistency degree coefficient of the NH3 of the front end SCR1:
Various acquisition device adopts the gas of at least four measuring points of the first rear end SCR under the control of pipeline reversing service again
Collection, obtains the gas of each measuring point；
The freshly harvested each measuring point gas of gas analyzer counterweight is analyzed respectively, the gas of each measuring point resurveyed
The each component concentration value of body；
Computing device is by each component concentration value of the gas of each measuring point resurveyed and collected corresponding survey for the first time
The each component concentration value of the gas of point carries out difference calculating；
If difference is in default error range, computing device executes subsequent step.
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| PCT/CN2020/086994 WO2021022841A1 (en) | 2019-08-06 | 2020-04-26 | Multi-probe sampling device, and system and method for testing mixture homogeneity of ammonia gas |
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