WO2021139214A1 - Ammonia gas concentration uniformity test method for gas exhaust aftertreatment system - Google Patents

Ammonia gas concentration uniformity test method for gas exhaust aftertreatment system Download PDF

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WO2021139214A1
WO2021139214A1 PCT/CN2020/117108 CN2020117108W WO2021139214A1 WO 2021139214 A1 WO2021139214 A1 WO 2021139214A1 CN 2020117108 W CN2020117108 W CN 2020117108W WO 2021139214 A1 WO2021139214 A1 WO 2021139214A1
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aftertreatment system
exhaust gas
uniformity
ammonia
ammonia concentration
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PCT/CN2020/117108
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French (fr)
Chinese (zh)
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官见忠
胡仁静
王成
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天纳克（苏州）排放系统有限公司
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Publication of WO2021139214A1 publication Critical patent/WO2021139214A1/en

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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
    • 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

Definitions

  • the invention relates to a method for testing the uniformity of ammonia concentration of an exhaust gas aftertreatment system, and belongs to the technical field of engine exhaust gas aftertreatment.
  • the method commonly used in the prior art is a method for measuring the uniformity of ammonia with nitric oxide.
  • the nitric oxide used in this method is not only expensive and highly toxic, but also uses the conversion amount of nitric oxide to indirectly calculate the amount of ammonia.
  • This test method process will introduce other factors, not direct measurement, so it will have a certain impact on the accuracy of the results.
  • Another measurement method in the prior art is to drill holes in the same pipe section, and measure the uniformity of ammonia gas by changing the position of the sampling hole.
  • this method has the problem of a small number of measurement points, which tends to distort the results.
  • the purpose of the present invention is to provide a method for testing the uniformity of ammonia concentration of an exhaust gas aftertreatment system with convenient measurement and relatively accurate results.
  • a method for testing the uniformity of ammonia concentration of an exhaust gas aftertreatment system the exhaust gas aftertreatment system including an exhaust source for generating exhaust gas, located in the exhaust
  • the selective catalytic reducing agent downstream of the gas source and the ammonia generating device located upstream of the selective catalytic reducing agent includes the following steps:
  • a sampling probe is arranged at the detection end surface downstream of the selective catalytic reduction agent, and the gas at several detection positions on the detection end surface is sampled by the sampling probe, and the ammonia concentration at the detection position is obtained value;
  • UI NH3 represents the uniformity value of ammonia concentration in the exhaust aftertreatment system
  • C NH3, i represents the ammonia concentration value at the i-th detection position
  • a i represents the area of the i-th detection position
  • the exhaust source is an engine, or a burner, or a heating furnace.
  • the ammonia generating device is a urea injection device, and the urea injection device is used to inject atomized urea droplets into the exhaust gas and convert the urea droplets into ammonia gas.
  • the exhaust gas aftertreatment system includes a diesel oxidation catalyst located upstream of the selective catalytic reduction agent.
  • the exhaust gas aftertreatment system includes a diesel particulate trap between the diesel oxidation catalyst and the selective catalytic reduction agent, and the urea injection device is located on the diesel particulate Between the trap and the selective catalytic reduction agent.
  • the exhaust gas aftertreatment system includes a mixer located downstream of the urea injection device and upstream of the selective catalytic reduction agent.
  • the sampling probe is connected to an ammonia gas analyzer through a sampling tube to measure the ammonia gas concentration at the detection position.
  • the sampling probe is spaced a certain distance D from the outlet end surface of the selective catalytic reduction agent in a direction perpendicular to the detection end surface.
  • step a) the sampling probe moves in the plane where the detection end face is located to obtain the ammonia concentration value from the first detection position to the nth detection position.
  • the present invention uses a sampling probe to sample the gas at several detection positions on the detection end face to obtain the ammonia concentration value at the detection position; and calculates the ammonia gas of the exhaust aftertreatment system by using a formula Concentration uniformity value, no highly toxic gas is used, and relatively accurate ammonia concentration uniformity value can be obtained through this formula.
  • Fig. 1 is a schematic diagram of the method for testing the uniformity of ammonia concentration of the exhaust gas aftertreatment system of the present invention.
  • Fig. 2 is a schematic diagram of several detection positions downstream of the selective catalytic reduction agent in Fig. 1.
  • the present invention discloses a method for testing the uniformity of ammonia concentration of an exhaust gas aftertreatment system, wherein the exhaust gas aftertreatment system includes an exhaust gas source 1 for generating exhaust gas. , A selective catalytic reducing agent (SCR) 2 located downstream of the exhaust source 1 and an ammonia generating device 3 located upstream of the selective catalytic reducing agent 2.
  • the method for testing the uniformity of ammonia concentration includes the following steps:
  • a sampling probe 4 is arranged at the detection end face 21 downstream of the selective catalytic reduction agent 2, and the gas at several detection positions 211 of the detection end face 21 is sampled by the sampling probe 4, and the result Detect the ammonia concentration value at position 211;
  • U INH3 represents the uniformity value of the ammonia concentration of the exhaust aftertreatment system
  • C NH3, i represents the ammonia concentration value at the i-th detection position
  • a i represents the area of the i-th detection position
  • the exhaust source 1 is an engine, or a burner, or a heating furnace.
  • the exhaust gas discharged from the exhaust source has a certain temperature and the airflow flows to the selective catalytic reducing agent 2 downstream.
  • the ammonia generating device 3 refers to a device that directly injects liquid ammonia into the exhaust gas.
  • the ammonia generating device 3 is a urea injection device (for example, a urea nozzle), and the urea injection device is used to inject atomized urea droplets into the exhaust gas.
  • the urea droplets undergo pyrolysis and hydrolysis chemical reactions at the high temperature of the exhaust gas, and finally the urea droplets are converted into ammonia (NH 3 ).
  • the exhaust gas aftertreatment system further includes a diesel oxidation catalyst (DOC) 5 located upstream of the selective catalytic reducing agent 2, the diesel oxidation catalyst 5 and the selective catalytic reduction agent 2
  • DOC diesel oxidation catalyst
  • DPF diesel particulate filter
  • the urea injection device is located between the diesel particulate trap 6 and the selective catalytic reduction agent 2.
  • the function of the mixer 7 is to improve the conversion of ammonia gas and make the ammonia gas and exhaust gas mix more uniformly.
  • the diesel oxidation catalyst 5, the diesel particulate trap 6 and the mixer 7 may not be provided; or only the diesel oxidation catalyst 5 and the diesel One or more of the particle trap 6 and the mixer 7.
  • the selective catalytic reduction agent 2 is a reaction element with a honeycomb structure, which includes an outlet end surface 20.
  • the detection end surface 21 is spaced from the outlet end surface 20 of the selective catalytic reduction agent 2 by a certain distance D in a direction perpendicular to the detection end surface 21 (ie axial direction Z), that is, the sampling probe 4 is perpendicular to the
  • the detection end face 21 is separated from the outlet end face 20 of the selective catalytic reduction agent 2 by a certain distance D in the direction.
  • 10mm ⁇ D ⁇ 20mm this arrangement does not cause the sampling probe 4 to be too close to the selective catalytic reduction agent 2 to avoid damage to the selective catalytic reduction agent 2. Do not make the sampling probe 4 too far away from the selective catalytic reduction agent 2, so as to affect the accuracy of the detection result.
  • the sampling probe 4 is connected to the ammonia analyzer 41 through a sampling tube 40 to measure the ammonia concentration at the detection position 211.
  • the detection position 211 is a block with a certain area.
  • the sampling probe 4 moves in the plane where the detection end face 21 is located (that is, moves along the X direction and the Y direction perpendicular to the axis Z) to obtain the first detection position 211 to the nth detection position.
  • the ammonia concentration value at the position 211 is detected.
  • This detection method does not require additional holes in the exhaust pipe, which is convenient for testing.
  • the number of detection locations 211 can be flexibly adjusted according to different detection requirements; for example, for testing requirements with very high accuracy requirements, the number of detection locations 211 can be increased.
  • the present invention uses the sampling probe 4 to sample the gas at several detection positions 211 on the detection end face to obtain the ammonia concentration value at the detection position 211; and calculates the exhaust gas aftertreatment system by using a formula
  • the uniformity value of ammonia concentration does not use highly toxic gas, and the relatively accurate uniformity value of ammonia concentration can be obtained through this formula, which is an effective detection method.

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  • Combustion & Propulsion (AREA)
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  • General Physics & Mathematics (AREA)
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Abstract

An ammonia gas concentration uniformity test method for a gas exhaust aftertreatment system. The gas exhaust aftertreatment system comprises a selective catalytic reduction agent (2) and an ammonia gas generation apparatus (3) located downstream of a gas exhaust source (1). The ammonia gas concentration uniformity test method comprises the following steps: a) sampling a gas at several measurement positions (211) on a measurement end face (21) by means of a sampling probe (4), and obtaining ammonia gas concentration values at the measurement positions (211); and b) obtaining, by means of calculation, ammonia gas concentration uniformity value formula (I) for a gas exhaust aftertreatment system by using the following formula, wherein UINH3 denotes an ammonia gas concentration uniformity value of the gas exhaust aftertreatment system, CNH3 ,i denotes an ammonia gas concentration value at an ith measurement position (211), (AA) denotes an ammonia gas concentration average value of all the measurement positions (211), Ai denotes the area of the ith measurement position (211), and (BB) denotes the summation of the values of the first measurement position (211) to an nth measurement position (211).

Description

排气后处理系统的氨气浓度均匀性测试方法Test method for uniformity of ammonia concentration of exhaust gas aftertreatment system
本申请要求了申请日为2020年01月10日、申请号为202010024911.3、发明名称为“排气后处理系统的氨气浓度均匀性测试方法”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。This application claims the priority of a Chinese patent application whose application date is January 10, 2020, the application number is 202010024911.3, and the invention title is "Test Method for Ammonia Concentration Uniformity of Exhaust Gas Aftertreatment System", the entire content of which is incorporated by reference Incorporated in this application.
技术领域Technical field
本发明涉及一种排气后处理系统的氨气浓度均匀性测试方法，属于发动机排气后处理技术领域。The invention relates to a method for testing the uniformity of ammonia concentration of an exhaust gas aftertreatment system, and belongs to the technical field of engine exhaust gas aftertreatment.
背景技术Background technique
随着全球排放法规的不断升级，其对排气后处理系统提出越来越高的要求，其中氨气浓度的均匀性对系统设计具有重要影响。With the continuous upgrading of global emission regulations, it puts forward higher and higher requirements on exhaust after-treatment systems, in which the uniformity of ammonia concentration has an important impact on system design.
现有技术中普遍采用的方法是一氧化氮测氨气均匀性的方法，然而该方法中使用的一氧化氮不仅昂贵，具有剧毒，而且是使用一氧化氮转换量间接计算出氨气量。这种测试方法过程会引入其他因子，不是直接测量，因此对结果的准确性有一定的影响。现有技术中另一种测量方法是在同一管道截面内打上多孔，通过改变采样孔的位置来测量氨气的均匀性，然而该方法存在测量点数少的问题，容易结果失真。The method commonly used in the prior art is a method for measuring the uniformity of ammonia with nitric oxide. However, the nitric oxide used in this method is not only expensive and highly toxic, but also uses the conversion amount of nitric oxide to indirectly calculate the amount of ammonia. This test method process will introduce other factors, not direct measurement, so it will have a certain impact on the accuracy of the results. Another measurement method in the prior art is to drill holes in the same pipe section, and measure the uniformity of ammonia gas by changing the position of the sampling hole. However, this method has the problem of a small number of measurement points, which tends to distort the results.
发明内容Summary of the invention
本发明的目的在于提供一种测量方便且结果比较准确的排气后处理系统的氨气浓度均匀性测试方法。The purpose of the present invention is to provide a method for testing the uniformity of ammonia concentration of an exhaust gas aftertreatment system with convenient measurement and relatively accurate results.
为实现上述目的，本发明采用如下技术方案：一种排气后处理系统的氨气浓度均匀性测试方法，所述排气后处理系统包括用以产生排气的排气源、位于所述排气源的下游的选择性催化还原剂以及位于所述选择性催化还原剂的上游 的氨气发生装置，所述氨气浓度均匀性测试方法包括如下步骤：In order to achieve the above objective, the present invention adopts the following technical solution: a method for testing the uniformity of ammonia concentration of an exhaust gas aftertreatment system, the exhaust gas aftertreatment system including an exhaust source for generating exhaust gas, located in the exhaust The selective catalytic reducing agent downstream of the gas source and the ammonia generating device located upstream of the selective catalytic reducing agent, the method for testing the uniformity of ammonia concentration includes the following steps:
a)在所述选择性催化还原剂的下游的检测端面处布置采样探头，通过所述采样探头对所述检测端面的若干检测位置的气体进行采样，并得出所述检测位置的氨气浓度值；a) A sampling probe is arranged at the detection end surface downstream of the selective catalytic reduction agent, and the gas at several detection positions on the detection end surface is sampled by the sampling probe, and the ammonia concentration at the detection position is obtained value;
b)利用如下公式计算得出排气后处理系统的氨气浓度均匀性值：b) Use the following formula to calculate the uniformity value of the ammonia concentration of the exhaust aftertreatment system:
Figure PCTCN2020117108-appb-000001
其中：
Figure PCTCN2020117108-appb-000001
among them:
UI NH3表示排气后处理系统的氨气浓度均匀性值； UI NH3 represents the uniformity value of ammonia concentration in the exhaust aftertreatment system;
C NH3，i表示第i个检测位置的氨气浓度值； C NH3, i represents the ammonia concentration value at the i-th detection position;
Figure PCTCN2020117108-appb-000002
表示所有检测位置的氨气浓度平均值；
Figure PCTCN2020117108-appb-000002
Indicates the average value of ammonia concentration at all detection positions;
A i表示第i个检测位置的面积； A i represents the area of the i-th detection position;
Figure PCTCN2020117108-appb-000003
表示第1个检测位置到第n个检测位置的数值求和。
Figure PCTCN2020117108-appb-000003
Indicates the sum of the values from the first detection position to the nth detection position.
作为本发明进一步改进的技术方案，所述排气源为发动机、或者燃烧器、或者加热炉。As a further improved technical solution of the present invention, the exhaust source is an engine, or a burner, or a heating furnace.
作为本发明进一步改进的技术方案，所述氨气发生装置为尿素喷射装置，所述尿素喷射装置用以向排气中喷射雾化的尿素液滴并将所述尿素液滴转化为氨气。As a further improved technical solution of the present invention, the ammonia generating device is a urea injection device, and the urea injection device is used to inject atomized urea droplets into the exhaust gas and convert the urea droplets into ammonia gas.
作为本发明进一步改进的技术方案，所述排气后处理系统包括位于所述选择性催化还原剂的上游的柴油氧化催化剂。As a further improved technical solution of the present invention, the exhaust gas aftertreatment system includes a diesel oxidation catalyst located upstream of the selective catalytic reduction agent.
作为本发明进一步改进的技术方案，所述排气后处理系统包括位于所述柴油氧化催化剂与所述选择性催化还原剂之间的柴油颗粒捕集器，所述尿素喷射装置位于所述柴油颗粒捕集器与所述选择性催化还原剂之间。As a further improved technical solution of the present invention, the exhaust gas aftertreatment system includes a diesel particulate trap between the diesel oxidation catalyst and the selective catalytic reduction agent, and the urea injection device is located on the diesel particulate Between the trap and the selective catalytic reduction agent.
作为本发明进一步改进的技术方案，所述排气后处理系统包括位于所述尿素喷射装置的下游、位于所述选择性催化还原剂的上游的混合器。As a further improved technical solution of the present invention, the exhaust gas aftertreatment system includes a mixer located downstream of the urea injection device and upstream of the selective catalytic reduction agent.
作为本发明进一步改进的技术方案，所述采样探头通过采样管与氨气分析仪相连，以测量得出所述检测位置的氨气浓度。As a further improved technical solution of the present invention, the sampling probe is connected to an ammonia gas analyzer through a sampling tube to measure the ammonia gas concentration at the detection position.
作为本发明进一步改进的技术方案，所述采样探头沿垂直于所述检测端面的方向上与所述选择性催化还原剂的出口端面间隔一定的距离D。As a further improved technical solution of the present invention, the sampling probe is spaced a certain distance D from the outlet end surface of the selective catalytic reduction agent in a direction perpendicular to the detection end surface.
作为本发明进一步改进的技术方案，10mm≤D≤20mm。As a further improved technical solution of the present invention, 10mm≤D≤20mm.
作为本发明进一步改进的技术方案，在步骤a)中，所述采样探头在检测端面所在的平面内移动，以得到第1个检测位置到第n个检测位置的氨气浓度值。As a further improved technical solution of the present invention, in step a), the sampling probe moves in the plane where the detection end face is located to obtain the ammonia concentration value from the first detection position to the nth detection position.
相较于现有技术，本发明通过采样探头对检测端面的若干检测位置的气体进行采样，得出所述检测位置的氨气浓度值；并利用公式计算得出排气后处理系统的氨气浓度均匀性值，不使用剧毒气体，而且通过该公式能够得出相对准确的氨气浓度的均匀性数值。Compared with the prior art, the present invention uses a sampling probe to sample the gas at several detection positions on the detection end face to obtain the ammonia concentration value at the detection position; and calculates the ammonia gas of the exhaust aftertreatment system by using a formula Concentration uniformity value, no highly toxic gas is used, and relatively accurate ammonia concentration uniformity value can be obtained through this formula.
附图说明Description of the drawings
图1是本发明排气后处理系统的氨气浓度均匀性测试方法的示意图。Fig. 1 is a schematic diagram of the method for testing the uniformity of ammonia concentration of the exhaust gas aftertreatment system of the present invention.
图2是图1中选择性催化还原剂的下游的若干检测位置的示意图。Fig. 2 is a schematic diagram of several detection positions downstream of the selective catalytic reduction agent in Fig. 1.
具体实施方式Detailed ways
请参图1及图2所示，本发明揭示了一种排气后处理系统的氨气浓度均匀性测试方法，其中所述排气后处理系统的包括用以产生排气的排气源1、位于所述排气源1的下游的选择性催化还原剂(SCR)2以及位于所述选择性催化还原剂2的上游的氨气发生装置3。所述氨气浓度均匀性测试方法包括如下步骤：Please refer to FIG. 1 and FIG. 2, the present invention discloses a method for testing the uniformity of ammonia concentration of an exhaust gas aftertreatment system, wherein the exhaust gas aftertreatment system includes an exhaust gas source 1 for generating exhaust gas. , A selective catalytic reducing agent (SCR) 2 located downstream of the exhaust source 1 and an ammonia generating device 3 located upstream of the selective catalytic reducing agent 2. The method for testing the uniformity of ammonia concentration includes the following steps:
a)在所述选择性催化还原剂2的下游的检测端面21处布置采样探头4，通过所述采样探头4对所述检测端面21的若干检测位置211的气体进行采样，并得出所述检测位置211的氨气浓度值；a) A sampling probe 4 is arranged at the detection end face 21 downstream of the selective catalytic reduction agent 2, and the gas at several detection positions 211 of the detection end face 21 is sampled by the sampling probe 4, and the result Detect the ammonia concentration value at position 211;
b)利用如下公式计算得出排气后处理系统的氨气浓度均匀性值：b) Use the following formula to calculate the uniformity value of the ammonia concentration of the exhaust aftertreatment system:
Figure PCTCN2020117108-appb-000004
其中：
Figure PCTCN2020117108-appb-000004
among them:
U INH3表示排气后处理系统的氨气浓度均匀性值； U INH3 represents the uniformity value of the ammonia concentration of the exhaust aftertreatment system;
C NH3，i表示第i个检测位置的氨气浓度值； C NH3, i represents the ammonia concentration value at the i-th detection position;
Figure PCTCN2020117108-appb-000005
表示所有检测位置的氨气浓度平均值；
Figure PCTCN2020117108-appb-000005
Indicates the average value of ammonia concentration at all detection positions;
A i表示第i个检测位置的面积； A i represents the area of the i-th detection position;
Figure PCTCN2020117108-appb-000006
表示第1个检测位置到第n个检测位置的数值求和。
Figure PCTCN2020117108-appb-000006
Indicates the sum of the values from the first detection position to the nth detection position.
所述排气源1为发动机、或者燃烧器、或者加热炉。排气源排出的排气具有一定的温度且气流向下游的选择性催化还原剂2流动。The exhaust source 1 is an engine, or a burner, or a heating furnace. The exhaust gas discharged from the exhaust source has a certain temperature and the airflow flows to the selective catalytic reducing agent 2 downstream.
在本发明的一种实施方式中，所述氨气发生装置3是指将液态氨气直接喷入排气中的装置。当然，在其他实施方式中，所述氨气发生装置3为尿素喷射装置(例如尿素喷嘴)，所述尿素喷射装置用以向排气中喷射雾化的尿素液滴。尿素液滴在排气的高温下发生热解、水解化学反应，并最终将所述尿素液滴转化为氨气(NH 3)。 In an embodiment of the present invention, the ammonia generating device 3 refers to a device that directly injects liquid ammonia into the exhaust gas. Of course, in other embodiments, the ammonia generating device 3 is a urea injection device (for example, a urea nozzle), and the urea injection device is used to inject atomized urea droplets into the exhaust gas. The urea droplets undergo pyrolysis and hydrolysis chemical reactions at the high temperature of the exhaust gas, and finally the urea droplets are converted into ammonia (NH 3 ).
在本发明图示的实施方式中，所述排气后处理系统还包括位于所述选择性催化还原剂2的上游的柴油氧化催化剂(DOC)5、位于所述柴油氧化催化剂5与所述选择性催化还原剂2之间的柴油颗粒捕集器(DPF)6以及位于所述尿素喷射装置的下游且位于所述选择性催化还原剂2的上游的混合器7。所述尿素喷射装置位于所述柴油颗粒捕集器6与所述选择性催化还原剂2之间。所述混合器7的作用是能提氨气的转化，并使氨气与排气混合更均匀。当然，在本发明的其他实施方式中，也可以不设置所述柴油氧化催化剂5、所述柴油颗粒捕集器6以及所述混合器7；或者只设置所述柴油氧化催化剂5、所述柴油颗粒捕集器6以及所述混合器7中的一个或者多个。In the illustrated embodiment of the present invention, the exhaust gas aftertreatment system further includes a diesel oxidation catalyst (DOC) 5 located upstream of the selective catalytic reducing agent 2, the diesel oxidation catalyst 5 and the selective catalytic reduction agent 2 A diesel particulate filter (DPF) 6 between the catalytic reducing agent 2 and a mixer 7 located downstream of the urea injection device and upstream of the selective catalytic reducing agent 2. The urea injection device is located between the diesel particulate trap 6 and the selective catalytic reduction agent 2. The function of the mixer 7 is to improve the conversion of ammonia gas and make the ammonia gas and exhaust gas mix 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 the diesel oxidation catalyst 5 and the diesel One or more of the particle trap 6 and the mixer 7.
所述选择性催化还原剂2为一种呈蜂窝结构的反应元件，其包括出口端面20。所述检测端面21沿垂直于所述检测端面21的方向上(即轴向Z)与所述选择性催化还原剂2的出口端面20间隔一定的距离D，即所述采样探头4沿垂直于所述检测端面21的方向上与所述选择性催化还原剂2的出口端面20间隔一定的距离D。在本发明的一种实施方式中，经过发明人的大量实验验证，10mm≤D≤20mm；如此设置，既不使采样探头4过分靠近选择性催化还原剂2，以避免损害选择性催化还原剂2，也不使采样探头4过分远离选择性催化还原剂2，以影响检测结果的准确性。The selective catalytic reduction agent 2 is a reaction element with a honeycomb structure, which includes an outlet end surface 20. The detection end surface 21 is spaced from the outlet end surface 20 of the selective catalytic reduction agent 2 by a certain distance D in a direction perpendicular to the detection end surface 21 (ie axial direction Z), that is, the sampling probe 4 is perpendicular to the The detection end face 21 is separated from the outlet end face 20 of the selective catalytic reduction agent 2 by a certain distance D in the direction. In one embodiment of the present invention, after a large number of experiments verified by the inventor, 10mm≤D≤20mm; this arrangement does not cause the sampling probe 4 to be too close to the selective catalytic reduction agent 2 to avoid damage to the selective catalytic reduction agent 2. Do not make the sampling probe 4 too far away from the selective catalytic reduction agent 2, so as to affect the accuracy of the detection result.
在本发明的一种实施方式中，所述采样探头4通过采样管40与氨气分析仪 41相连，以测量得出所述检测位置211的氨气浓度。请参图2所示，所述检测位置211为具有一定面积的方框。在步骤a)中，所述采样探头4在检测端面21所在的平面内移动(即沿着垂直于轴向Z的X方向和Y方向移动)，以得到第1个检测位置211到第n个检测位置211的氨气浓度值。这种检测方式不需要在排气管上额外打孔，便于测试。而且，检测位置211的数量根据检测要求的不同可以灵活调整；例如，对于精度要求非常高的测试要求，可以增加检测位置211的数量。In an embodiment of the present invention, the sampling probe 4 is connected to the ammonia analyzer 41 through a sampling tube 40 to measure the ammonia concentration at the detection position 211. Please refer to FIG. 2, the detection position 211 is a block with a certain area. In step a), the sampling probe 4 moves in the plane where the detection end face 21 is located (that is, moves along the X direction and the Y direction perpendicular to the axis Z) to obtain the first detection position 211 to the nth detection position. The ammonia concentration value at the position 211 is detected. This detection method does not require additional holes in the exhaust pipe, which is convenient for testing. Moreover, the number of detection locations 211 can be flexibly adjusted according to different detection requirements; for example, for testing requirements with very high accuracy requirements, the number of detection locations 211 can be increased.
相较于现有技术，本发明通过采样探头4对检测端面的若干检测位置211的气体进行采样，得出所述检测位置211的氨气浓度值；并利用公式计算得出排气后处理系统的氨气浓度均匀性值，不使用剧毒气体，而且通过该公式能够得出相对准确的氨气浓度的均匀性数值，是一种有效的检测方法。Compared with the prior art, the present invention uses the sampling probe 4 to sample the gas at several detection positions 211 on the detection end face to obtain the ammonia concentration value at the detection position 211; and calculates the exhaust gas aftertreatment system by using a formula The uniformity value of ammonia concentration does not use highly toxic gas, and the relatively accurate uniformity value of ammonia concentration can be obtained through this formula, which is an effective detection method.
以上实施例仅用于说明本发明而并非限制本发明所描述的技术方案，对本说明书的理解应该以所属技术领域的技术人员为基础，尽管本说明书参照上述的实施例对本发明已进行了详细的说明，但是，本领域的普通技术人员应当理解，所属技术领域的技术人员仍然可以对本发明进行修改或者等同替换，而一切不脱离本发明的精神和范围的技术方案及其改进，均应涵盖在本发明的权利要求范围内。The above embodiments are only used to illustrate the present invention and not to limit the technical solutions described in the present invention. The understanding of this specification should be based on those skilled in the art, although this specification has already described the present invention in detail with reference to the above embodiments. Note, however, those of ordinary skill in the art should understand that those skilled in the art can still modify or equivalently replace the present invention, and all technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered in Within the scope of the claims of the present invention.

Claims (10)

  1. 一种排气后处理系统的氨气浓度均匀性测试方法，所述排气后处理系统包括用以产生排气的排气源、位于所述排气源的下游的选择性催化还原剂以及位于所述选择性催化还原剂的上游的氨气发生装置，所述氨气浓度均匀性测试方法包括如下步骤：A method for testing the uniformity of ammonia concentration of an exhaust aftertreatment system. The exhaust aftertreatment system includes an exhaust source for generating exhaust gas, a selective catalytic reducing agent located downstream of the exhaust source, and For the ammonia generating device upstream of the selective catalytic reducing agent, the method for testing the uniformity of the ammonia concentration includes the following steps:
    a)在所述选择性催化还原剂的下游的检测端面处布置采样探头，通过所述采样探头对所述检测端面的若干检测位置的气体进行采样，并得出所述检测位置的氨气浓度值；a) A sampling probe is arranged at the detection end surface downstream of the selective catalytic reduction agent, and the gas at several detection positions on the detection end surface is sampled by the sampling probe, and the ammonia concentration at the detection position is obtained value;
    b)利用如下公式计算得出排气后处理系统的氨气浓度均匀性值：b) Use the following formula to calculate the uniformity value of the ammonia concentration of the exhaust aftertreatment system:
    Figure PCTCN2020117108-appb-100001
    其中：
    Figure PCTCN2020117108-appb-100001
    among them:
    UI NH3表示排气后处理系统的氨气浓度均匀性值； UI NH3 represents the uniformity value of ammonia concentration in the exhaust aftertreatment system;
    C NH3，i表示第i个检测位置的氨气浓度值； C NH3, i represents the ammonia concentration value at the i-th detection position;
    Figure PCTCN2020117108-appb-100002
    表示所有检测位置的氨气浓度平均值；
    Figure PCTCN2020117108-appb-100002
    Indicates the average value of ammonia concentration at all detection positions;
    A i表示第i个检测位置的面积； A i represents the area of the i-th detection position;
    Figure PCTCN2020117108-appb-100003
    表示第1个检测位置到第n个检测位置的数值求和。
    Figure PCTCN2020117108-appb-100003
    Indicates the sum of the values from the first detection position to the nth detection position.
  2. 如权利要求1所述的排气后处理系统的氨气浓度均匀性测试方法，其特征在于：所述排气源为发动机、或者燃烧器、或者加热炉。The method for testing the uniformity of ammonia concentration of the exhaust gas aftertreatment system according to claim 1, wherein the exhaust gas source is an engine, or a burner, or a heating furnace.
  3. 如权利要求1所述的排气后处理系统的氨气浓度均匀性测试方法，其特征在于：所述氨气发生装置为尿素喷射装置，所述尿素喷射装置用以向排气中喷射雾化的尿素液滴并将所述尿素液滴转化为氨气。The method for testing the uniformity of ammonia gas concentration of an exhaust gas aftertreatment system according to claim 1, wherein the ammonia generating device is a urea injection device, and the urea injection device is used for spraying atomization into the exhaust gas. Urea droplets and convert the urea droplets into ammonia gas.
  4. 如权利要求3所述的排气后处理系统的氨气浓度均匀性测试方法，其特征在于：所述排气后处理系统包括位于所述选择性催化还原剂的上游的柴油氧化催化剂。The method for testing the uniformity of ammonia concentration of the exhaust gas aftertreatment system according to claim 3, wherein the exhaust gas aftertreatment system includes a diesel oxidation catalyst located upstream of the selective catalytic reduction agent.
  5. 如权利要求4所述的排气后处理系统的氨气浓度均匀性测试方法，其特 征在于：所述排气后处理系统包括位于所述柴油氧化催化剂与所述选择性催化还原剂之间的柴油颗粒捕集器，所述尿素喷射装置位于所述柴油颗粒捕集器与所述选择性催化还原剂之间。The method for testing the uniformity of the ammonia concentration of the exhaust gas aftertreatment system according to claim 4, wherein the exhaust gas aftertreatment system includes a device located between the diesel oxidation catalyst and the selective catalytic reducing agent A diesel particulate trap, and the urea injection device is located between the diesel particulate trap and the selective catalytic reduction agent.
  6. 如权利要求5所述的排气后处理系统的氨气浓度均匀性测试方法，其特征在于：所述排气后处理系统包括位于所述尿素喷射装置的下游、位于所述选择性催化还原剂的上游的混合器。The method for testing the uniformity of ammonia concentration of the exhaust gas aftertreatment system according to claim 5, wherein the exhaust gas aftertreatment system includes downstream of the urea injection device and the selective catalytic reducing agent. The upstream mixer.
  7. 如权利要求1所述的排气后处理系统的氨气浓度均匀性测试方法，其特征在于：所述采样探头通过采样管与氨气分析仪相连，以测量得出所述检测位置的氨气浓度。The method for testing the uniformity of ammonia concentration of the exhaust gas aftertreatment system according to claim 1, wherein the sampling probe is connected to an ammonia analyzer through a sampling tube to measure the ammonia at the detection position. concentration.
  8. 如权利要求1所述的排气后处理系统的氨气浓度均匀性测试方法，其特征在于：所述采样探头沿垂直于所述检测端面的方向上与所述选择性催化还原剂的出口端面间隔一定的距离D。The method for testing the uniformity of ammonia concentration of the exhaust gas aftertreatment system according to claim 1, wherein the sampling probe is aligned with the outlet end surface of the selective catalytic reduction agent in a direction perpendicular to the detection end surface. Be separated by a certain distance D.
  9. 如权利要求8所述的排气后处理系统的氨气浓度均匀性测试方法，其特征在于：10mm≤D≤20mm。The method for testing the uniformity of ammonia concentration of the exhaust gas aftertreatment system according to claim 8, characterized in that: 10mm≤D≤20mm.
  10. 如权利要求1至9项中任意一项所述的排气后处理系统的氨气浓度均匀性测试方法，其特征在于：在步骤a)中，所述采样探头在检测端面所在的平面内移动，以得到第1个检测位置到第n个检测位置的氨气浓度值。The method for testing the uniformity of ammonia concentration of the exhaust gas aftertreatment system according to any one of claims 1 to 9, characterized in that: in step a), the sampling probe moves in the plane where the detection end face is located , In order to obtain the ammonia concentration value from the first detection position to the nth detection position.
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