CN111208261A - Ammonia gas concentration uniformity testing method of exhaust aftertreatment system - Google Patents
Ammonia gas concentration uniformity testing method of exhaust aftertreatment system Download PDFInfo
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- CN111208261A CN111208261A CN202010024911.3A CN202010024911A CN111208261A CN 111208261 A CN111208261 A CN 111208261A CN 202010024911 A CN202010024911 A CN 202010024911A CN 111208261 A CN111208261 A CN 111208261A
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- ammonia gas
- ammonia
- aftertreatment system
- gas concentration
- exhaust
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 90
- 238000012360 testing method Methods 0.000 title claims abstract description 14
- 238000001514 detection method Methods 0.000 claims abstract description 64
- 238000005070 sampling Methods 0.000 claims abstract description 28
- 238000010531 catalytic reduction reaction Methods 0.000 claims abstract description 21
- 239000000523 sample Substances 0.000 claims abstract description 20
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 15
- 229910000069 nitrogen hydride Inorganic materials 0.000 claims abstract description 7
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 18
- 239000004202 carbamide Substances 0.000 claims description 18
- 239000003795 chemical substances by application Substances 0.000 claims description 16
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- 230000003197 catalytic effect Effects 0.000 claims description 10
- 239000003638 chemical reducing agent Substances 0.000 claims description 10
- 238000010998 test method Methods 0.000 claims description 10
- 238000011144 upstream manufacturing Methods 0.000 claims description 9
- 239000003054 catalyst Substances 0.000 claims description 8
- 230000003647 oxidation Effects 0.000 claims description 8
- 238000007254 oxidation reaction Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims 2
- 239000007789 gas Substances 0.000 description 28
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 239000000243 solution Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 108010063955 thrombin receptor peptide (42-47) Proteins 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Images
Classifications
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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
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/10—Testing internal-combustion engines by monitoring exhaust gases or combustion flame
- G01M15/102—Testing internal-combustion engines by monitoring exhaust gases or combustion flame by monitoring exhaust gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Food Science & Technology (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Biochemistry (AREA)
- Analytical Chemistry (AREA)
- Medicinal Chemistry (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
A method for testing uniformity of ammonia concentration of an exhaust gas after-treatment system comprises a selective catalytic reduction agent and an ammonia gas generation device which are positioned at the downstream of an exhaust gas source. The ammonia gas concentration uniformity testing method comprises the following steps: a) sampling gas at a plurality of detection positions of the detection end face through the sampling probe, and obtaining an ammonia concentration value at the detection positions; b) and calculating the ammonia gas concentration uniformity value of the exhaust gas post-treatment system by using the following formula:
wherein: UINH3Ammonia gas representing exhaust aftertreatment SystemA value of concentration uniformity; cNH3，iAn ammonia gas concentration value representing the ith detection position;
represents the average ammonia gas concentration at all detection positions; a. theiAn area indicating an ith detection position;
the sum of the values representing the 1 st detection position to the nth detection position.
Description
Technical Field
The invention relates to a method for testing the uniformity of ammonia concentration of an exhaust aftertreatment system, and belongs to the technical field of engine exhaust aftertreatment.
Background
With the increasing upgrading of global emissions regulations, it puts increasing demands on exhaust gas aftertreatment systems, where the uniformity of ammonia concentration has a significant impact on system design.
The method generally adopted in the prior art is a method for measuring ammonia gas uniformity by using nitric oxide, however, the nitric oxide used in the method is expensive and highly toxic, and the ammonia gas amount is indirectly calculated by using nitric oxide conversion amount. Other factors can be introduced in the testing method process, and direct measurement is not carried out, so that the accuracy of the result is influenced to a certain extent. In the other measurement method in the prior art, multiple holes are drilled in the same pipeline section, and the uniformity of the ammonia gas is measured by changing the positions of sampling holes.
Disclosure of Invention
The invention aims to provide a method for testing the uniformity of ammonia concentration of an exhaust aftertreatment system, which is convenient to measure and has relatively accurate result.
In order to achieve the purpose, the invention adopts the following technical scheme: a method of testing ammonia gas concentration uniformity of an exhaust gas after-treatment system including an exhaust gas source to produce exhaust gas, a selective catalytic reduction agent downstream of the exhaust gas source, and an ammonia gas generating device upstream of the selective catalytic reduction agent, the method comprising the steps of:
a) arranging a sampling probe at a detection end face at the downstream of the selective catalytic reducing agent, sampling gas at a plurality of detection positions of the detection end face through the sampling probe, and obtaining an ammonia concentration value at the detection position;
b) and calculating the ammonia gas concentration uniformity value of the exhaust gas post-treatment system by using the following formula:
UINH3representing an ammonia concentration uniformity value of the exhaust aftertreatment system;
CNH3，ian ammonia gas concentration value representing the ith detection position;
Aian area indicating an ith detection position;
As a further improved technical scheme of the invention, the exhaust gas source is an engine, a burner or a heating furnace.
As a further improved technical solution of the present invention, the ammonia gas generating device is a urea injection device, and the urea injection device is configured to inject atomized urea droplets into the exhaust gas and convert the urea droplets into ammonia gas.
As a further development of the invention, the exhaust gas aftertreatment system comprises a diesel oxidation catalyst upstream of the selective catalytic reduction agent.
As a further improved technical solution of the present invention, the exhaust aftertreatment system includes a diesel particulate trap located between the diesel oxidation catalyst and the selective catalytic reduction agent, and the urea injection device is located between the diesel particulate trap and the selective catalytic reduction agent.
As a further development of the invention, the exhaust gas aftertreatment system comprises a mixer downstream of the urea injection device and upstream of the selective catalytic reduction agent.
As a further improved technical scheme of the invention, the sampling probe is connected with an ammonia gas analyzer through a sampling pipe so as to measure and obtain the ammonia gas concentration at the detection position.
As a further improved technical scheme of the invention, the sampling probe is separated from the outlet end face of the selective catalytic reduction agent by a certain distance D along the direction perpendicular to the detection end face.
As a further improved technical scheme of the invention, D is more than or equal to 10mm and less than or equal to 20 mm.
As a further improved technical solution of the present invention, in step a), the sampling probe moves in a plane where the detection end face is located, so as to obtain ammonia concentration values from the 1 st detection position to the nth detection position.
Compared with the prior art, the method has the advantages that the gas at a plurality of detection positions of the detection end face is sampled by the sampling probe, so that the ammonia concentration value at the detection positions is obtained; and the ammonia gas concentration uniformity value of the exhaust aftertreatment system is calculated by using a formula, no virulent gas is used, and a relatively accurate ammonia gas concentration uniformity value can be obtained by using the formula.
Drawings
FIG. 1 is a schematic diagram of a method for testing uniformity of ammonia concentration in an exhaust aftertreatment system according to the invention.
FIG. 2 is a schematic illustration of several detection locations downstream of the selective catalytic reductant of FIG. 1.
Detailed Description
Referring to fig. 1 and 2, the present invention discloses a method for testing uniformity of ammonia concentration in an exhaust gas after-treatment system, wherein the exhaust gas after-treatment system comprises an exhaust gas source 1 for generating exhaust gas, a Selective Catalytic Reduction (SCR)2 located downstream of the exhaust gas source 1, and an ammonia gas generator 3 located upstream of the SCR 2. The ammonia gas concentration uniformity testing method comprises the following steps:
a) arranging a sampling probe 4 at a detection end face 21 downstream of the selective catalytic reduction agent 2, sampling gas at a plurality of detection positions 211 of the detection end face 21 through the sampling probe 4, and obtaining an ammonia gas concentration value at the detection positions 211;
b) and calculating the ammonia gas concentration uniformity value of the exhaust gas post-treatment system by using the following formula:
UINH3representing an ammonia concentration uniformity value of the exhaust aftertreatment system;
CNH3，ian ammonia gas concentration value representing the ith detection position;
Aian area indicating an ith detection position;
The exhaust gas source 1 is an engine, a burner or a heating furnace. The exhaust gas emitted by the exhaust source has a temperature and flows downstream of the selective catalytic reduction agent 2.
In one embodiment of the present invention, the ammonia gas generator 3 is a device for directly injecting liquid ammonia gas into exhaust gas. Of course, in other embodiments, the ammonia gas generator 3 is a urea injection device (e.g., a urea nozzle) configured to inject atomized urea droplets into the exhaust gas. The urea droplets undergo a pyrolytic, hydrolytic chemical reaction at the high temperature of the exhaust gas and are eventually converted into ammonia (NH)3)。
In the illustrated embodiment of the invention, the exhaust aftertreatment system further comprises a Diesel Oxidation Catalyst (DOC)5 located upstream of the selective catalytic reductant 2, a diesel particulate trap (DPF)6 located between the diesel oxidation catalyst 5 and the selective catalytic reductant 2, and a mixer 7 located downstream of the urea injection device and upstream of the selective catalytic reductant 2. The urea injection device is located between the diesel particulate trap 6 and the selective catalytic reduction agent 2. The mixer 7 is used for improving the conversion of ammonia gas and enabling the ammonia gas to be mixed with the exhaust gas more uniformly. Of course, in other embodiments of the present invention, the diesel oxidation catalyst 5, the diesel particulate trap 6, and the mixer 7 may not be provided; or only one or more of the diesel oxidation catalyst 5, the diesel particulate trap 6, and the mixer 7 may be provided.
The selective catalytic reduction agent 2 is a reaction element having a honeycomb structure, and includes an outlet end face 20. The detection end face 21 is spaced from the outlet end face 20 of the selective catalytic reduction agent 2 by a certain distance D in a direction perpendicular to the detection end face 21 (i.e., the axial direction Z), that is, the sampling probe 4 is spaced from the outlet end face 20 of the selective catalytic reduction agent 2 by a certain distance D in a direction perpendicular to the detection end face 21. In one embodiment of the invention, through a great deal of experimental verification of the inventor, D is more than or equal to 10mm and less than or equal to 20 mm; so set up, neither make sampling probe 4 excessively be close to selective catalytic reduction 2 to avoid haring selective catalytic reduction 2, also make sampling probe 4 excessively keep away from selective catalytic reduction 2, with the accuracy that influences the testing result.
In one embodiment of the present invention, the sampling probe 4 is connected to an ammonia gas analyzer 41 through a sampling tube 40 to measure the ammonia gas concentration at the detection position 211. Referring to fig. 2, the detecting position 211 is a box with a certain area. In step a), the sampling probe 4 moves in the plane of the detection end face 21 (i.e., moves along the X direction and the Y direction perpendicular to the axial direction Z) to obtain the ammonia gas concentration values from the 1 st detection position 211 to the nth detection position 211. The detection mode does not need to additionally punch holes on the exhaust pipe, and is convenient for testing. Moreover, the number of the detection positions 211 can be flexibly adjusted according to different detection requirements; for example, for test requirements that require very high accuracy, the number of detection locations 211 may be increased.
Compared with the prior art, the method has the advantages that the gas at a plurality of detection positions 211 of the detection end face is sampled by the sampling probe 4, so that the ammonia gas concentration value of the detection positions 211 is obtained; and the ammonia gas concentration uniformity value of the exhaust aftertreatment system is calculated by using a formula, no extremely toxic gas is used, and a relatively accurate ammonia gas concentration uniformity value can be obtained by using the formula, so that the method is an effective detection method.
The above embodiments are only for illustrating the invention and not for limiting the technical solutions described in the invention, and the understanding of the present specification should be based on the technical personnel in the field, and although the present specification has described the invention in detail with reference to the above embodiments, the technical personnel in the field should understand that the technical personnel in the field can still make modifications or equivalent substitutions to the present invention, and all the technical solutions and modifications thereof without departing from the spirit and scope of the present invention should be covered in the claims of the present invention.
Claims (10)
1. A method of testing ammonia gas concentration uniformity of an exhaust gas after-treatment system including an exhaust gas source to produce exhaust gas, a selective catalytic reduction agent downstream of the exhaust gas source, and an ammonia gas generating device upstream of the selective catalytic reduction agent, the method comprising the steps of:
a) arranging a sampling probe at a detection end face at the downstream of the selective catalytic reducing agent, sampling gas at a plurality of detection positions of the detection end face through the sampling probe, and obtaining an ammonia concentration value at the detection position;
b) and calculating the ammonia gas concentration uniformity value of the exhaust gas post-treatment system by using the following formula:
UINH3representing an ammonia concentration uniformity value of the exhaust aftertreatment system;
CNH3，tan ammonia gas concentration value representing the ith detection position;
Aian area indicating an ith detection position;
2. The method of testing ammonia gas concentration uniformity of an exhaust aftertreatment system of claim 1, wherein: the exhaust gas source is an engine, a burner or a heating furnace.
3. The method of testing ammonia gas concentration uniformity of an exhaust aftertreatment system of claim 1, wherein: the ammonia gas generating device is a urea injection device, and the urea injection device is used for injecting atomized urea liquid drops into exhaust gas and converting the urea liquid drops into ammonia gas.
4. The method of testing ammonia gas concentration uniformity of an exhaust aftertreatment system according to claim 3, wherein: the exhaust aftertreatment system includes a diesel oxidation catalyst located upstream of the selective catalytic reductant.
5. The method of testing ammonia gas concentration uniformity of an exhaust aftertreatment system according to claim 4, wherein: the exhaust aftertreatment system includes a diesel particulate trap between the diesel oxidation catalyst and the selective catalytic reductant, and the urea injection device is between the diesel particulate trap and the selective catalytic reductant.
6. The method of testing ammonia gas concentration uniformity of an exhaust aftertreatment system according to claim 5, wherein: the exhaust aftertreatment system includes a mixer downstream of the urea injection device and upstream of the selective catalytic reduction agent.
7. The method of testing ammonia gas concentration uniformity of an exhaust aftertreatment system of claim 1, wherein: and the sampling probe is connected with an ammonia gas analyzer through a sampling pipe so as to measure the ammonia gas concentration at the detection position.
8. The method of testing ammonia gas concentration uniformity of an exhaust aftertreatment system of claim 1, wherein: and the sampling probe is separated from the outlet end face of the selective catalytic reducing agent by a certain distance D along the direction vertical to the detection end face.
9. The method of testing ammonia concentration uniformity of an exhaust aftertreatment system according to claim 8, wherein: d is more than or equal to 10mm and less than or equal to 20 mm.
10. The method for testing the uniformity of ammonia gas concentration in an exhaust gas after-treatment system according to any one of claims 1 to 9, wherein: in the step a), the sampling probe moves in a plane where the detection end face is located, so as to obtain ammonia concentration values from a 1 st detection position to an nth detection position.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010024911.3A CN111208261A (en) | 2020-01-10 | 2020-01-10 | Ammonia gas concentration uniformity testing method of exhaust aftertreatment system |
| PCT/CN2020/117108 WO2021139214A1 (en) | 2020-01-10 | 2020-09-23 | Ammonia gas concentration uniformity test method for gas exhaust aftertreatment system |
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| CN202010024911.3A CN111208261A (en) | 2020-01-10 | 2020-01-10 | Ammonia gas concentration uniformity testing method of exhaust aftertreatment system |
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| WO2021139214A1 (en) * | 2020-01-10 | 2021-07-15 | 天纳克（苏州）排放系统有限公司 | Ammonia gas concentration uniformity test method for gas exhaust aftertreatment system |
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| US8375700B2 (en) * | 2010-03-30 | 2013-02-19 | Detroit Diesel Corporation | Apparatus and method for monitoring oxidation catalyst functionality |
| CN102854184B (en) * | 2012-09-07 | 2014-07-02 | 天津世纪动力科技发展有限公司 | Special measurement system for concurrently measuring ammonia gas and nitrogen oxide in motor tail gas |
| CN103867273A (en) * | 2014-04-04 | 2014-06-18 | 北京科领动力科技有限公司 | Device and method for measuring distribution uniformity of reducing agent of diesel engine SCR system |
| US9638631B2 (en) * | 2014-06-10 | 2017-05-02 | Cummins Emission Solutions, Inc. | Species spatial reconstruction for exhaust system using spectroscopy and tomography |
| CN109884256A (en) * | 2019-03-27 | 2019-06-14 | 河南科技大学 | SCR catalyst container multi-section measuring system |
| CN110426249B (en) * | 2019-08-06 | 2022-05-20 | 无锡威孚力达催化净化器有限责任公司 | Multi-probe sampling device, and ammonia gas mixing uniformity testing system and method |
| 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 |
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| WO2021139214A1 (en) * | 2020-01-10 | 2021-07-15 | 天纳克（苏州）排放系统有限公司 | Ammonia gas concentration uniformity test method for gas exhaust aftertreatment system |
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