CN110426249B - Multi-probe sampling device, and ammonia gas mixing uniformity testing system and method - Google Patents
Multi-probe sampling device, and ammonia gas mixing uniformity testing system and method Download PDFInfo
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 87
- 238000005070 sampling Methods 0.000 title claims abstract description 65
- 239000000523 sample Substances 0.000 title claims abstract description 63
- 238000012360 testing method Methods 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000007246 mechanism Effects 0.000 claims abstract description 65
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 36
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 22
- 239000004202 carbamide Substances 0.000 claims description 22
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 23
- 239000003054 catalyst Substances 0.000 description 15
- 238000001321 HNCO Methods 0.000 description 10
- OWIKHYCFFJSOEH-UHFFFAOYSA-N Isocyanic acid Chemical compound N=C=O OWIKHYCFFJSOEH-UHFFFAOYSA-N 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 10
- 238000009434 installation Methods 0.000 description 9
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 5
- 238000000354 decomposition reaction Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 238000010586 diagram 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
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000005259 measurement Methods 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
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- G01N1/00—Sampling; Preparing specimens for investigation
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- 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
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- 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
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- 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
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- G01N33/0054—Ammonia
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- G01N1/00—Sampling; Preparing specimens for investigation
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- G01N2001/2285—Details of probe structures
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- 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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Abstract
The invention relates to the technical field of diesel engine tail gas aftertreatment, and particularly discloses a multi-probe sampling device, which comprises: the device comprises a flange, a gas taking pipeline, a propelling mechanism and a driving mechanism; the flange includes flange main part and flange supporting part, the flange supporting part is connected with one side of flange main part, be provided with at least one through-hole on the lateral wall of one side of flange main part, all set up an air duct joint in every through-hole, an air duct is all connected to every air duct joint, the air duct sets up with flange supporting part homonymy, the one end that the air duct deviates from the air duct joint passes advancing mechanism and with advancing mechanism fixed connection, actuating mechanism is connected with advancing mechanism, every air duct deviates from the one end of air duct joint and all connects a pipeline of getting gas. The invention also discloses a system and a method for testing the ammonia mixing uniformity of the SCR system. The multi-probe sampling device provided by the invention can improve the testing precision of the ammonia gas mixing uniformity.
Description
Technical Field
The invention relates to the technical field of diesel engine tail gas aftertreatment, in particular to a multi-probe sampling device, a system for testing ammonia mixing uniformity of an SCR (selective catalytic reduction) system comprising the multi-probe sampling device and a method for testing ammonia mixing uniformity of the SCR system.
Background
The SCR technology is to inject into the post-processor a catalyst capable of decomposing into NH3Thereby achieving selective conversion of NOx. NH (NH)3The degree of uniformity of distribution in the SCR catalyst directly determines the NOx conversion efficiency and the catalyst utilization. Under the current technical conditions, the improvement of the urea atomization effect and the increase of a urea mixer are mostly adopted to improve NH3And obtaining NH by CFD simulation method3Distribution uniformity index at SCR catalyst face to NH3Uniformity was evaluated. Meanwhile, a research institution adopts a method of welding a fixed sampling point at the last section of the SCR white carrier to test decomposition product NH after urea is sprayed3Indirectly evaluating NH of the front end face of the SCR3Uniformity of concentration distribution.
But the above pair of NH3The evaluation mode of the distribution uniformity of the concentration has larger test error due to the technical limitation, and the distribution uniformity of the ammonia gas decomposed after the urea is sprayed in the air inlet section of the SCR system can not be accurately tested.
Disclosure of Invention
The invention provides a multi-probe sampling device, a system and a method for testing ammonia mixing uniformity of an SCR system, which comprise the multi-probe sampling device, and solves the problem of low test precision of the ammonia distribution uniformity degree of the ammonia at the air inlet section of the SCR system in the related technology.
As an aspect of the present invention, there is provided a multi-probe sampling apparatus, wherein the multi-probe sampling apparatus includes: the device comprises a flange, a gas taking pipeline, a propelling mechanism and a driving mechanism;
the flange comprises a flange main body part and a flange supporting part, the flange supporting part is connected with one side of the flange main body part, at least one through hole is formed in the side wall of one side of the flange main body part, an air duct joint is arranged in each through hole, each air duct joint is connected with an air duct, the air duct is arranged on the same side as the flange supporting part, one end of the air duct, which is far away from the air duct joint, penetrates through the propelling mechanism and is fixedly connected with the propelling mechanism, the driving mechanism is connected with the propelling mechanism, one end of each air duct, which is far away from the air duct joint, is connected with an air taking pipeline, and each air taking pipeline can be connected to a pipeline switching device;
the driving mechanism can drive the propelling mechanism to move along the direction perpendicular to one side of the flange main body part, the propelling mechanism can drive each air duct to move, and one end of each air duct joint, which deviates from the air duct, can collect gas at the rear end of the first SCR when the air duct moves.
Furthermore, a first fixing support and a second fixing support are arranged on the flange supporting portion, the first fixing support and the second fixing support are arranged in parallel at intervals, the parallel direction of the first fixing support and the second fixing support is perpendicular to the driving direction of the driving mechanism, and the driving mechanism is arranged on the first fixing support and the second fixing support and can drive the propelling mechanism to move along the direction perpendicular to the first fixing support and the second fixing support.
Furthermore, a first limiting structure is arranged on the first fixing support, a second limiting structure is arranged on the second fixing support, and the driving mechanism drives the propelling mechanism to move within a range limited by the first limiting structure and the second limiting structure.
Further, the first limiting mechanism comprises a first limiting block and a first fixing clamping piece, the first limiting block is arranged on the first fixing support, the first fixing clamping piece is connected with the first limiting block, and the first limiting block, the first fixing clamping piece and the first fixing support enclose to form a first limiting hole.
Furthermore, the second limiting mechanism comprises a second limiting block and a second fixing clamping piece, the second limiting block is arranged on the second fixing support, the second fixing clamping piece is connected with the second limiting block, and the second limiting block, the second fixing clamping piece and the second fixing support enclose a second limiting hole.
Further, the drive mechanism comprises a servo drive hydraulic cylinder.
Further, the propulsion mechanism includes a propulsion flange.
As another aspect of the present invention, a system for testing ammonia mixing uniformity of an SCR system is provided, wherein the system for testing ammonia mixing uniformity of an SCR system comprises: an SCR system, a pipeline switching device, a gas analyzer, a calculating device and the multi-probe sampling device,
the SCR system comprises a DOC, a DPF, a mixing device, a first SCR and a second SCR which are sequentially connected, wherein a first NOx sensor and a first temperature sensor are arranged at the inlet of the DOC, the first NOx sensor is used for detecting the NOx concentration at the inlet of the DOC, and the first temperature sensor is used for detecting the temperature value at the inlet of the DOC;
a second NOx sensor is arranged at the rear end of the DPF and used for detecting the concentration of NOx at the rear end of the DPF;
a urea nozzle is arranged on the mixing device, and a nozzle metering system of the urea nozzle can obtain the urea injection amount in the mixing device;
a second temperature sensor is arranged at the front end of the first SCR and used for detecting the temperature value of the front end of the first SCR;
the rear end of the first SCR is provided with the multi-probe sampling device, and the multi-probe sampling device can collect gas at the rear end of the first SCR;
the pipeline switching device is connected with the multi-probe sampling device, can control gas collection of the multi-probe sampling device, and can send the gas collected by the multi-probe sampling device to the gas analyzer;
the gas analyzer can analyze the gas collected by the multi-probe sampling device to obtain concentration values of all components of the gas at the rear end of the first SCR;
the computing device is capable of operating in accordance with the firstCalculating the concentration value of each component of the gas at the rear end of the SCR to obtain NH at the front end of the first SCR3The distribution uniformity coefficient of (2).
As another aspect of the present invention, a method for testing uniformity of ammonia mixing in an SCR system is provided, where the method for testing uniformity of ammonia mixing in an SCR system includes:
under the preset working condition of the engine, the multi-probe sampling device carries out duration acquisition on the gas of a plurality of measuring points at the rear end of the first SCR under the control of the pipeline switching device to obtain the gas of each measuring point;
the gas analyzer analyzes the gas of each measuring point respectively to obtain the concentration value of each component of the gas of each measuring point;
the calculating device calculates and obtains NH at the front end of the first SCR according to the concentration values of all components of the gas at a plurality of measuring points3The distribution uniformity coefficient of (2).
Further, the method for testing the ammonia mixing uniformity of the SCR system further comprises the step of calculating NH at the front end of the first SCR according to the concentration values of all components of the gas at a plurality of measuring points in the calculating device3Before the step of distributing uniformity coefficients:
the multiple collecting device is used for collecting the gas of at least four measuring points at the rear end of the first SCR under the control of the pipeline switching device again to obtain the gas of each measuring point;
the gas analyzer analyzes the newly collected gas at each measuring point respectively to obtain the concentration value of each component of the newly collected gas at each measuring point;
the calculating device calculates the difference value of the component concentration value of the gas of each measuring point which is acquired again and the component concentration value of the gas of the corresponding measuring point which is acquired for the first time;
if the difference value is within the preset error range, the calculating device executes the subsequent steps.
Through above-mentioned many probe sampling device, set up an at least air duct, can realize the multiple spot collection to the gaseous of first SCR rear end, and can realize vertical installation through above-mentioned many probe sampling device's structure, horizontal installation, perhaps become the installation of any angle with first SCR, can occupy very little space like this and the gaseous on the first SCR rear end of collection that can the at utmost, when this many probe sampling device is used in the test system of SCR system ammonia mixing degree of consistency, owing to the collection gas that can the multiple test point, thereby can improve the test accuracy of ammonia mixing degree of consistency.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is an isometric view of a multi-probe sampling device provided by the present invention.
Fig. 2 is a front view of a multi-probe sampling device provided by the present invention.
Fig. 3 is a schematic structural diagram of a system for testing ammonia gas mixing uniformity of an SCR system according to the present invention.
Fig. 4 is a schematic connection diagram of the multi-probe sampling device, the pipeline switching device and the gas analyzer provided by the invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged as appropriate in order to facilitate the embodiments of the invention described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Further, an Oxidation Catalyst (DOC), a Selective Catalytic Reduction Catalyst (SCR), and a Particulate trap (DPF) may be used.
Before the testing of the ammonia mixing uniformity is realized, the testing principle of the ammonia mixing uniformity is explained in detail.
The current industry adopts an ammonia mixing uniformity coefficient NH3UI to evaluate NH at SCR catalyst inlet section3The degree of uniformity of distribution. If the inlet section of the SCR catalyst is divided into a plurality of surface units, NH3The calculation formula of UI is as follows:
wherein NH3UI represents the ammonia mixing uniformity coefficient, A represents the cross-sectional area of the carrier, AiDenotes the area of cell i, miIndicating the cell i axial NH3The concentration of (a) in (b),
denotes the average NH3The concentration of (c).
According to a calculation formula, only NH of a limited number of unit surfaces needs to be tested on the inlet section of the SCR catalyst3Concentration, i.e. obtaining NH of the entire inlet cross section3UI. But due to the cross section of the SCR catalyst inletComplexity of gas flow and urea distribution by direct measurement of NH at SCR inlet cross section3There are difficulties with the concentration. Since the SCR catalyst support is a honeycomb ceramic, which has a good rectifying effect on the gas flow and gas components, the gas flow distribution and NH on the outlet face of the first SCR is3The distribution is very stable. Therefore, the NH of the SCR inlet section is indirectly calculated by adopting a mode of arranging a measuring point on the first SCR outlet section3The concentration is the better choice.
After the urea aqueous solution is sprayed into the mixer, pyrolysis and hydrolysis are carried out under the action of high temperature and catalyst, and the generated products mainly comprise HNCO and NH3And CO2The chemical reaction formula is as follows:
(NH2)2CO＝>HCNO+NH3，
HCNO+H2O＝>NH3+CO2。
however, if the exhaust temperature is low, the urea is not completely decomposed, and other complex chemical products and even crystals may be generated. But these complex product pairs tested NH3The distribution uniformity of (2) has no influence and can be disregarded. NH formed by decomposition of urea3Under the action of the catalyst and NOx in the tail gas, a series of chemical reactions are carried out, and the generated products are complex. Only two main chemical reactions are considered here. Namely a fast reaction and a standard reaction, the reaction formula is as follows:
Standard SCR：4NH3+4NO+O2＝4N2+6H2O，
Fast SCR：4NH3+2NO+2NO2＝4N2+6H2O。
from the reaction equation, the NH required for NOx conversion can be seen3The number of moles and the number of moles of NOx was 1: 1. So that NH downstream of the first SCR may be3Slip + NH required to react with NOx3Amount + not hydrolyzed to NH3Amount of HNCO of (2) calculating upstream NH3Theoretical value. The calculation formula is as follows:
NH3，usSCR＝NH3，UIFlange+(NOx，usSCR-NOx，UIFlange)+HNCO，
wherein NH3,UIFlangeIndicating NH measured by a multi-probe sampling device3Concentration of (3), NOx,usSCRIndicates NOx concentration before SCR (available from the NOx sensor after DPF), NOx,UIFlangeIndicating the NOx concentration measured by the multi-probe sampling device and HNCO indicating the HNCO concentration measured by the multi-probe sampling device.
Here, NH3,UIFlangeFor NH measured at a multi-probe sampling device3Concentration of NH that is also not reacted by the first SCR3。NOx,usSCRThe pre-first SCR NOx concentration may be measured from a post-DPF NOx sensor. However, the distribution of the NOx concentration before the first SCR is affected by the mixer to some extent, and therefore, when the airflow is distributed very uniformly on the front end face of the first SCR, the NOx before the first SCR can be considered to be completely uniformly distributed, and the value measured by the NOx sensor after the DPF can be directly used for calculation.
To realize to NH3In the present embodiment, a multi-probe sampling apparatus is provided, and fig. 1 and 2 are an axonometric view and a front view, respectively, of the multi-probe sampling apparatus provided according to the embodiment of the present invention, as shown in fig. 1 and 2, including: the device comprises a flange 5-1, a gas taking pipeline 5-6, a propelling mechanism 5-4 and a driving mechanism 5-7;
the flange 5-1 comprises a flange main body part 5-101 and a flange supporting part 5-102, the flange supporting part 5-102 is connected with one side of the flange main body part 5-101, at least one through hole is formed in the side wall of one side of the flange main body part 5-101, an air pipe joint 5-2 is arranged in each through hole, each air pipe joint 5-2 is connected with an air pipe 5-3, the air pipe 5-3 and the flange supporting part 5-102 are arranged on the same side, one end, deviating from the air pipe joint 5-2, of each air pipe 5-3 penetrates through the propelling mechanism 5-4 and is fixedly connected with the propelling mechanism 5-4, the driving mechanism 5-7 is connected with the propelling mechanism 5-4, one end, deviating from the air pipe joint 5-2, of each air pipe 5-3 is connected with a pipe taking joint 5-4 The gas taking pipelines 5-6 are connected with the pipeline switching device respectively;
the driving mechanism 5-7 can drive the propelling mechanism 5-4 to move in a direction perpendicular to one side of the flange main body part 5-101, the propelling mechanism 5-4 can drive each air duct 5-3 to move, and one end, away from the air duct 5-3, of each air duct joint 5-2 can collect gas at the rear end of the first SCR when the air duct 5-3 moves.
Through above-mentioned many probe sampling device, set up an at least air duct, can realize the multiple spot collection to the gaseous of first SCR rear end, and can realize vertical installation through above-mentioned many probe sampling device's structure, horizontal installation, perhaps become the installation of any angle with first SCR, can occupy very little space like this and the gaseous on the first SCR rear end of collection that can the at utmost, when this many probe sampling device is used in the test system of SCR system ammonia mixing degree of consistency, owing to the collection gas that can the multiple test point, thereby can improve the test accuracy of ammonia mixing degree of consistency.
Specifically, in order to support the driving mechanism 5-7, a first fixing bracket 5-8 and a second fixing bracket 5-9 are arranged on the flange supporting portion 5-102, the first fixing bracket 5-8 and the second fixing bracket 5-9 are arranged in parallel and at intervals, the parallel direction of the first fixing bracket 5-8 and the second fixing bracket 5-9 is perpendicular to the driving direction of the driving mechanism 5-7, and the driving mechanism 5-7 is arranged on the first fixing bracket 5-8 and the second fixing bracket 5-9 and can drive the propelling mechanism 5-4 to move in the direction perpendicular to the first fixing bracket 5-8 and the second fixing bracket 5-9.
Further, in order to support the driving mechanism 5-7, a first limiting structure is arranged on the first fixing support 5-8, a second limiting structure is arranged on the second fixing support 5-9, and the driving mechanism 5-7 drives the propelling mechanism 5-4 to move within a range defined by the first limiting structure and the second limiting structure.
Preferably, the first limiting mechanism comprises a first limiting block 5-12 and a first fixing clamping piece 5-10, the first limiting block is arranged on the first fixing support 5-8, the first fixing clamping piece 5-10 is connected with the first limiting block 5-12, and a first limiting hole is defined by the first limiting block 5-12, the first fixing clamping piece 5-10 and the first fixing support 5-8.
Preferably, the second limiting mechanism comprises a second limiting block 5-13 and a second fixing clamping piece 5-11, the second limiting block 5-13 is arranged on the second fixing support 5-9, the second fixing clamping piece 5-11 is connected with the second limiting block 5-13, and a second limiting hole is defined by the second limiting block 5-13, the second fixing clamping piece 5-11 and the second fixing support 5-9.
It can be understood that the first limiting hole and the second limiting hole are arranged in parallel and correspondingly, the driving mechanism 5-7 can drive the propelling mechanism 5-4 to move after passing through the first limiting hole and the second limiting hole, and the driving mechanism 5-7 is arranged perpendicular to the propelling mechanism 5-4.
Preferably, said drive means 5-7 comprise servo-driven hydraulic cylinders.
It should be noted that, the propulsion mechanism is driven by the servo-driven hydraulic cylinder, so that the selection of the measuring point is very flexible, and all the points of interest can be basically covered.
Preferably, said propulsion means 5-4 comprise a propulsion flange.
Preferably, as shown in fig. 1 and 2, the present embodiment takes 6 airway tubes as an example. It should be understood that, after considering the size of the gas-guide tube, the gas flow distribution and the fixed size of the flange, the 6 gas-guide tubes can achieve the purposes of having small influence on the gas flow distribution and realizing a plurality of measuring points.
It should be noted that, the multi-probe sampling device in this embodiment is fixed by flange installation, so as to be convenient for installation and disassembly, and can be repeatedly used in different schemes and different projects.
As another embodiment of the present invention, a system for testing uniformity of ammonia gas mixing in an SCR system is provided, wherein as shown in fig. 3, the system for testing uniformity of ammonia gas mixing in an SCR system includes: an SCR system, a pipeline switching device Switch Box, a gas analyzer FTIR, a computing device and the multi-probe sampling device 5 described in the foregoing,
the SCR system comprises a DOC, a DPF, a mixing device Mixer, a first SCR and a second SCR which are sequentially connected, wherein a first NOx sensor and a first temperature sensor are arranged at the inlet position 1 of the DOC, the first NOx sensor is used for detecting the NOx concentration at the inlet of the DOC, and the first temperature sensor is used for detecting the temperature value at the inlet of the DOC;
a second NOx sensor is arranged at the rear end 2 of the DPF and used for detecting the concentration of NOx at the rear end of the DPF;
a urea nozzle 3 is arranged on the mixing device Mixer, and a nozzle metering system of the urea nozzle 3 can obtain the urea injection amount in the mixing device;
a second temperature sensor is arranged at the front end 4 of the first SCR and used for detecting the temperature value of the front end of the first SCR;
the multi-probe sampling device 5 is arranged at the rear end of the first SCR, and the multi-probe sampling device 5 can collect gas at the rear end of the first SCR;
the pipeline switching device Switch Box is connected with the multi-probe sampling device 5, and the pipeline switching device Switch Box can control gas collection of the multi-probe sampling device 5 and can send gas collected by the multi-probe sampling device 5 to the gas analyzer FTIR;
the gas analyzer FTIR can analyze the gas collected by the multi-probe sampling device 5 to obtain concentration values of each component of the gas at the rear end of the first SCR;
the calculating device can calculate NH at the front end of the first SCR according to the concentration value of each component of the gas at the rear end of the first SCR3The distribution uniformity coefficient of (2).
Through the testing system of the ammonia mixing uniformity of the SCR system, due to the adoption of the multi-probe sampling device, gas can be collected at multiple test points, and the testing precision of the ammonia mixing uniformity can be improved.
As shown in fig. 3, an SCR system is mounted on an engine mount. And a first NOx sensor and a first temperature sensor are arranged at the position 1 of the DOC inlet of the purifier to test the concentration of NOx at the inlet of the SCR systemAnd an inlet temperature value. Installing a second NOx sensor at the rear end position 2 of the DPF to measure NO at the rear end of the DPFx,usSCR. Urea injection quantity is obtained by a nozzle metering system at the urea nozzle position 3, and whether the urea injection quantity is consistent with an ECU calibration value or not is confirmed. And a second temperature sensor is arranged at the front end position 4 of the first SCR and used for monitoring whether the temperature value of the measured working condition is reached. A multi-probe sampling device 5 is installed at a position 10mm behind a first SCR catalyst, and 6 sampling tubes are distributed on the multi-probe sampling device 5 and used for sampling gas at a specific position of a cross section where the multi-probe sampling device is located. The multi-probe sampling device 5 is connected with the pipeline switching device Switch Box, the pipeline switching device Switch Box carries out signal transmission with a gas analyzer FTIR, and the gas analyzer FTIR is used for testing NOx and NH in a gas sample3、N2The concentration of components such as O and HNCO. Namely, the emission pollutant NO on the section of the rear end of the first SCR can be directly testedx,UIFlangeAnd N2O and NH products of urea decomposition3,UIFlangeAnd concentration values of HNCO.
The multi-probe sampling device 5 is customized according to the size of the SCR catalyst carrier, and 30-50 test points are generally arranged on the cross section of the first SCR outlet as many as possible, as shown in FIG. 4.
And starting the engine, and adjusting the working condition of the engine to a required working condition, including rotating speed, torque and primary NOx. Moving the multi-probe sampling device 5 to the central point of the carrier for data monitoring, moving one probe in the multi-probe sampling device 5 to the test point 1 after the data such as the rotating speed, the torque, the SCR front temperature, the flow rate, the urea injection and the like are stabilized, and measuring NOx and NH after the data are stabilized for 2min again3、N2Measuring the concentration values of O and HNCO for 30s, and taking the average value as the concentration value of each component at the point; subsequent stations are then measured in sequence. After all the measuring points are measured, repeating the measuring points 1, 2, 3 and 4, comparing with the primary measured value, and if the error is less than 10%, determining that the tested data meets the requirement; and if the error is larger than 10%, waiting for 10min, and retesting again until the requirement is met. NOx and NH measured at each measuring point at the rear end of the first SCR3、N2O, HNCO, and converting the concentration value into NH of the corresponding measuring point on the front end face of the first SCR3Concentration values. The calculation formula is as follows:
NH3，usSCR＝NH3，UIFlange+(NOx，usSCR-NOx，UIFIange)+HNCO，
thus, NH of the front end face of the first SCR is obtained3The concentration value is distributed, and then an ammonia mixing uniformity formula is adopted:
calculating the ammonia mixing uniformity NH3The value of UI is NH on the front end face of the first SCR3The distribution uniformity coefficient of (2).
As another embodiment of the present invention, a method for testing ammonia mixing uniformity of an SCR system using the system for testing ammonia mixing uniformity of an SCR system described above is provided, wherein the method for testing ammonia mixing uniformity of an SCR system includes:
under the preset working condition of the engine, the multi-probe sampling device carries out duration acquisition on the gas of a plurality of measuring points at the rear end of the first SCR under the control of the pipeline switching device to obtain the gas of each measuring point;
the gas analyzer analyzes the gas of each measuring point respectively to obtain the concentration value of each component of the gas of each measuring point;
the calculating device calculates and obtains NH at the front end of the first SCR according to the concentration values of all components of the gas at a plurality of measuring points3The distribution uniformity coefficient of (2).
The method for testing the ammonia mixing uniformity of the SCR system further comprises the step of calculating NH at the front end of the first SCR according to the concentration values of all components of the gas at a plurality of measuring points in the calculating device3Before the step of distributing uniformity coefficients:
the multiple collecting device is used for collecting the gas of at least four measuring points at the rear end of the first SCR under the control of the pipeline switching device again to obtain the gas of each measuring point;
the gas analyzer analyzes the newly collected gas at each measuring point respectively to obtain the concentration value of each component of the newly collected gas at each measuring point;
the calculating device calculates the difference value of the component concentration value of the gas of each measuring point which is acquired again and the component concentration value of the gas of the corresponding measuring point which is acquired for the first time;
if the difference value is within the preset error range, the calculating device executes the subsequent steps.
By the method for testing the ammonia mixing uniformity of the SCR system, the multi-probe sampling device is adopted, so that gas can be collected at multiple test points, and the test precision of the ammonia mixing uniformity can be improved.
For a specific operation process of the method for testing the ammonia mixing uniformity of the SCR system, reference may be made to the foregoing description of the system for testing the ammonia mixing uniformity of the SCR system, and details are not described here.
According to the method and the system for testing the ammonia mixing uniformity of the SCR system, the test is directly carried out through the engine pedestal, the discharged substances are closer to the working condition of the whole vehicle, and the result is more accurate; and the sampling multi-probe sampling device can change the installation angle, and can increase the test points on the section of the rear end of the first SCR to the maximum extent, wherein the number of the test points shown in FIG. 4 is 46.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (9)
1. The testing system for ammonia mixing uniformity of the SCR system is characterized by comprising: an SCR system, a pipeline switching device, a gas analyzer, a calculating device and a multi-probe sampling device,
the SCR system comprises a DOC, a DPF, a mixing device, a first SCR and a second SCR which are sequentially connected, wherein a first NOx sensor and a first temperature sensor are arranged at the inlet of the DOC, the first NOx sensor is used for detecting the NOx concentration at the inlet of the DOC, and the first temperature sensor is used for detecting the temperature value at the inlet of the DOC;
a second NOx sensor is arranged at the rear end of the DPF and used for detecting the concentration of NOx at the rear end of the DPF;
a urea nozzle is arranged on the mixing device, and a nozzle metering system of the urea nozzle can obtain the urea injection amount in the mixing device;
a second temperature sensor is arranged at the front end of the first SCR and used for detecting the temperature value of the front end of the first SCR;
the rear end of the first SCR is provided with the multi-probe sampling device, and the multi-probe sampling device can collect gas at the rear end of the first SCR;
the pipeline switching device is connected with the multi-probe sampling device, can control gas collection of the multi-probe sampling device, and can send the gas collected by the multi-probe sampling device to the gas analyzer;
the gas analyzer can analyze the gas collected by the multi-probe sampling device to obtain concentration values of all components of the gas at the rear end of the first SCR;
the calculating device can calculate and obtain NH at the front end of the first SCR according to the concentration value of each component of the gas at the rear end of the first SCR3The distribution uniformity coefficient of (2);
the multi-probe sampling device includes: the device comprises a flange, a gas taking pipeline, a propelling mechanism and a driving mechanism;
the flange comprises a flange main body part and a flange supporting part, the flange supporting part is connected with one side of the flange main body part, at least one through hole is formed in the side wall of one side of the flange main body part, an air duct joint is arranged in each through hole, each air duct joint is connected with an air duct, the air duct is arranged on the same side of the flange supporting part, one end of the air duct, which is deviated from the air duct joint, penetrates through the propelling mechanism and is fixedly connected with the propelling mechanism, the driving mechanism is connected with the propelling mechanism, one end of each air duct, which is deviated from the air duct joint, is connected with an air taking pipeline, and each air taking pipeline can be connected to a pipeline switching device;
the driving mechanism can drive the propelling mechanism to move along the direction perpendicular to one side of the flange main body part, the propelling mechanism can drive each air duct to move, and one end of each air duct joint, which deviates from the air duct, can collect gas at the rear end of the first SCR when the air duct moves.
2. The test system according to claim 1, wherein a first fixing bracket and a second fixing bracket are arranged on the flange support part, the first fixing bracket and the second fixing bracket are arranged in parallel and at a distance, the parallel direction of the first fixing bracket and the second fixing bracket is perpendicular to the driving direction of the driving mechanism, and the driving mechanism is arranged on the first fixing bracket and the second fixing bracket and can drive the propelling mechanism to move in the direction perpendicular to the first fixing bracket and the second fixing bracket.
3. The test system of claim 2, wherein the first fixing bracket is provided with a first limiting structure, the second fixing bracket is provided with a second limiting structure, and the driving mechanism drives the propelling mechanism to move within a range defined by the first limiting structure and the second limiting structure.
4. The test system of claim 3, wherein the first limiting mechanism comprises a first limiting block and a first fixing clamping piece, the first limiting block is arranged on the first fixing support, the first fixing clamping piece is connected with the first limiting block, and the first limiting block, the first fixing clamping piece and the first fixing support enclose a first limiting hole.
5. The test system of claim 3, wherein the second limiting mechanism comprises a second limiting block and a second fixing clip, the second limiting block is disposed on the second fixing bracket, the second fixing clip is connected with the second limiting block, and the second limiting block, the second fixing clip and the second fixing bracket enclose a second limiting hole.
6. The test system of any one of claims 1 to 5, wherein the drive mechanism comprises a servo-driven hydraulic cylinder.
7. The testing system of any of claims 1-5, wherein the propulsion mechanism comprises a propulsion flange.
8. A testing method for testing the ammonia mixing uniformity of an SCR system by using the testing system for the ammonia mixing uniformity of the SCR system according to any one of claims 1 to 7, is characterized by comprising the following steps:
under the preset working condition of the engine, the multi-probe sampling device carries out duration acquisition on the gas of a plurality of measuring points at the rear end of the first SCR under the control of the pipeline switching device to obtain the gas of each measuring point;
the gas analyzer analyzes the gas of each measuring point respectively to obtain the concentration value of each component of the gas of each measuring point;
the calculating device calculates and obtains NH at the front end of the first SCR according to the concentration values of all components of the gas at a plurality of measuring points3The distribution uniformity coefficient of (2).
9. The method for testing the ammonia mixing uniformity of the SCR system as recited in claim 8, further comprising calculating, at the calculating device, NH at the front end of the first SCR according to the concentration values of the components of the gas at the plurality of measuring points3Before the step of distributing uniformity coefficients:
the multiple collecting device is used for collecting the gas of at least four measuring points at the rear end of the first SCR under the control of the pipeline switching device again to obtain the gas of each measuring point;
the gas analyzer respectively analyzes the newly acquired gas at each measuring point to obtain the concentration value of each component of the newly acquired gas at each measuring point;
the calculating device calculates the difference value of the component concentration value of the gas of each measuring point which is acquired again and the component concentration value of the gas of the corresponding measuring point which is acquired for the first time;
if the difference value is within the preset error range, the calculating device executes the subsequent steps.
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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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| CN111208261A (en) * | 2020-01-10 | 2020-05-29 | 天纳克（苏州）排放系统有限公司 | Ammonia gas concentration uniformity testing method of exhaust aftertreatment system |
| CN113818949A (en) * | 2021-10-26 | 2021-12-21 | 无锡威孚力达催化净化器有限责任公司 | Method for testing concentration of NOx in automobile exhaust, mixing device and aftertreatment system |
| CN114077848B (en) * | 2021-11-16 | 2022-11-04 | 无锡时和安全设备有限公司 | Novel sensor array plate and mixed gas analysis method thereof |
| CN114235435B (en) * | 2021-12-10 | 2024-03-19 | 保定市屹马汽车配件制造有限公司 | Ammonia mixing testing device for automobile exhaust system |
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