CN113670806B - Device and method for testing urea corrosion resistance of diesel vehicle postprocessor material - Google Patents
Device and method for testing urea corrosion resistance of diesel vehicle postprocessor material Download PDFInfo
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- CN113670806B CN113670806B CN202111097737.6A CN202111097737A CN113670806B CN 113670806 B CN113670806 B CN 113670806B CN 202111097737 A CN202111097737 A CN 202111097737A CN 113670806 B CN113670806 B CN 113670806B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The application discloses a device and a method for testing urea corrosion resistance of a diesel vehicle postprocessor material, wherein the testing device comprises an air inlet pipe, a temperature sensor, a first postprocessing assembly, a first clamp, a mixer assembly, a second clamp, a second postprocessing assembly and an air outlet pipe which are connected with each other; the mixer assembly comprises a urea nozzle, a nozzle base, a swirl tube, a Z-shaped baffle plate, a fixed flange, a sample fixing assembly and a second barrel which are connected with each other; the sample fixing component comprises a material sample, and the position of the material sample corresponds to the positions of the cyclone tube and the urea nozzle. The testing method comprises the specific implementation steps of testing the urea corrosion resistance of the material sample on the engine test bed by using the testing device. The testing device and the testing method provided by the application realize the real simulation of the urea corrosion process of the post-processor in the whole vehicle use process, accurately test the urea corrosion resistance of the post-processor material, and improve the working efficiency.
Description
Technical Field
The application belongs to the technical field of diesel engine tail gas aftertreatment, and particularly relates to a device and a method for testing urea corrosion resistance of a diesel vehicle aftertreatment material.
Background
In the exhaust gas aftertreatment system of the diesel engine, SCR (selective catalytic reduction Selective Catalytic Reduction) is mainly used for purifying the exhaust gas from outside and removing nitrogen oxide pollutants in the exhaust gas. The SCR works normally and urea aqueous solution with mass fraction of 32.5% is sprayed into the SCR post-processor; urea decomposes ammonia at high temperature, ammonia readily reacts with water to form ammonia water, has strong corrosiveness, can form strong corrosion to an SCR post-processor, particularly a mixer part of the post-processor, and the corrosion is aggravated under the high temperature of tail gas.
At present, the automobile industry aims at the corrosion resistance test of a post-processor, most of the corrosion resistance tests of post-processor materials are carried out by adopting a salt spray test, and an effective device and a method for testing the urea corrosion resistance of the post-processor are lacking.
The testing device and the testing method in the related art cannot truly simulate the urea corrosion process of the post-processor in the whole vehicle use process, namely cannot truly simulate the change of the real atmosphere and the real temperature in the post-processor, so that the testing is inaccurate, and the testing efficiency is low.
Disclosure of Invention
The application aims to: in order to overcome the defects in the prior art, the application provides a device and a method for testing the urea corrosion resistance of a diesel vehicle postprocessor material, and aims to solve the technical problem of truly simulating the urea corrosion process of the postprocessor in the whole vehicle using process, namely truly simulating the change of the real atmosphere and the real temperature in the postprocessor, further accurately testing the corrosion resistance of urea decomposition products of the postprocessor material, and improving the working efficiency.
The technical scheme is as follows: in order to achieve the above purpose, the application adopts the following technical scheme:
in one aspect, the application provides a urea corrosion resistance testing device of a diesel vehicle postprocessor material, which comprises an air inlet pipe, a temperature sensor, a first postprocessing component, a first clamp, a mixer component, a second clamp, a second postprocessing component and an air outlet pipe;
the inner space of the air inlet pipe, the first post-treatment component, the mixer component, the second post-treatment component and the air outlet pipe are sequentially communicated;
the air inlet pipe is fixedly connected with the first end of the first aftertreatment component; the second end of the first aftertreatment component is fixedly connected with the first end of the mixer component through the first clamp; the second end of the mixer assembly is fixedly connected with the first end of the second aftertreatment assembly through the second clamp; the second end of the second post-treatment component is fixedly connected with the air outlet pipe; the temperature sensor is fixedly connected with the air inlet pipe;
the mixer assembly comprises a urea nozzle, a nozzle base, a swirl tube, a Z-shaped baffle plate, a fixed flange, a sample fixing assembly and a second cylinder;
the urea nozzle is connected to the second cylinder body through the nozzle base, and the nozzle base is communicated with the interior of the second cylinder body; the cyclone tube, the Z-shaped partition plate, the fixed flange and the sample fixing assembly are all positioned in the second cylinder; the Z-shaped partition plate is fixedly connected with the inner wall of the second cylinder; the cyclone tube is fixedly connected with the Z-shaped partition plate, and the cyclone tube is positioned at one side of the Z-shaped partition plate, which is close to the nozzle base; the sample fixing assembly is fixedly connected with the Z-shaped partition plate through the fixing flange, and the sample fixing assembly and the fixing flange are positioned on one side, far away from the nozzle base, of the Z-shaped partition plate;
the sample fixing assembly comprises a material sample, and the position of the material sample corresponds to the positions of the cyclone tube and the urea nozzle.
Optionally, the sample fixing assembly further comprises two groups of bolts, two groups of first fixing blocks, two groups of second fixing blocks and two groups of nuts;
the two ends of the material sample wafer are respectively provided with the same sample wafer through holes, the fixed flange is provided with two groups of flange through holes corresponding to the sample wafer through holes, and the Z-shaped partition plate is provided with two groups of partition plate through holes corresponding to the sample wafer through holes;
the material sample wafer is located between the first fixed block and the second fixed block, and the bolts sequentially penetrate through the first fixed block, the sample wafer through holes, the second fixed block, the flange through holes and the partition plate through holes to be in threaded connection with the nuts.
Optionally, one side, attached to the material sample, of the first fixing block and the second fixing block is an inclined plane, and an inner included angle between the material sample and the fixing flange is 30-60 degrees;
the Z-shaped partition plate is also provided with an airflow hole which is matched with the cyclone tube;
the fixed flange is perpendicular to the central axis of the cyclone tube, the fixed flange, the airflow hole, the cyclone tube and the nozzle base are coaxial, and the central axis of the cyclone tube is perpendicular to the central axis of the second cylinder.
Optionally, the mixer assembly further comprises a heat shield and insulation wool;
the heat insulation cover is sleeved on the periphery of the second cylinder, and the heat insulation cotton is positioned between the heat insulation cover and the second cylinder.
Optionally, the first aftertreatment component comprises a first cylinder, a diesel oxidation catalyst and a diesel particulate filter, wherein the diesel oxidation catalyst and the diesel particulate filter are fixedly connected in the first cylinder;
the diesel oxidation catalyst is located on a side of the diesel particulate filter remote from the mixer assembly;
the first end of the first barrel is fixedly connected with the air inlet pipe, and the second end of the first barrel is fixedly connected with the first end of the mixer assembly through the first clamp.
Optionally, the second aftertreatment component includes a third cylinder and a selective catalytic reduction device, and the selective catalytic reduction device is fixedly connected in the third cylinder;
the first end of the third cylinder is fixedly connected with the second end of the mixer assembly through the second clamp, and the second end of the third cylinder is fixedly connected with the air outlet pipe.
Optionally, a plurality of groups of swirl plates are further vertically arranged on the peripheral wall of the swirl tube, and the swirl plates of the plurality of groups are uniformly distributed at intervals relative to the central axis of the swirl tube.
Optionally, the air inlet pipe, the first aftertreatment component, the mixer component, the second aftertreatment component, and the air outlet pipe are all coaxial.
In another aspect, the present application provides a method for testing the urea corrosion resistance of a diesel vehicle after-processor material, which is applicable to the device for testing the urea corrosion resistance of a diesel vehicle after-processor material as described in any one of the above, and the method is applied to computer equipment, and the method includes:
acquiring pre-test quality data and pre-test thickness data of the material sample, wherein the material sample is used for carrying out working condition test on a test bed through a urea corrosion resistance performance test device of the diesel vehicle postprocessor material;
sending a starting signal to the test bed;
monitoring the exhaust temperature in the working condition test;
transmitting a control signal to the urea nozzle in response to the exhaust temperature reaching a preset temperature threshold, the control signal indicating the urea nozzle to inject urea in an injection schedule;
acquiring tested quality data and tested thickness data of the material sample wafer in response to receiving an end signal of the test bed, wherein the end signal is used for indicating the urea nozzle to finish execution of the injection rule;
obtaining weight loss data of the material sample based on the pre-test quality data and the post-test quality data; determining a thinning rate of the material sample based on the pre-test thickness data and the post-test thickness data;
and evaluating the urea corrosion resistance of the material sample based on the weight loss data and the thinning rate.
Optionally, the injection rules include at least one of urea injection times rules, urea injection duration rules, and urea injection interval time rules.
The beneficial effects are that: compared with the prior art, the device and the method for testing the urea corrosion resistance of the diesel vehicle postprocessor material provided by the application realize the process of truly simulating the urea corrosion of the postprocessor in the whole vehicle use process, namely truly simulating the change of the real atmosphere and the real temperature in the postprocessor, further accurately testing the corrosion resistance of the postprocessor material to urea decomposition products and improving the working efficiency.
Drawings
The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate the application and together with the embodiments of the application, serve to explain the application. In the drawings:
FIG. 1 is a schematic diagram of a urea corrosion performance test apparatus for a diesel vehicle aftertreatment device, according to an exemplary embodiment of the present application;
FIG. 2 is an overall cross-sectional view of a urea corrosion performance test apparatus for a diesel vehicle aftertreatment material, provided in accordance with an exemplary embodiment of the present application;
FIG. 3 is a cross-sectional view of a mixer assembly of a urea corrosion performance testing apparatus for diesel vehicle aftertreatment materials, provided in accordance with an exemplary embodiment of the present application;
FIG. 4 is an exploded schematic view of a mixer assembly of a urea corrosion performance testing apparatus for diesel vehicle aftertreatment materials, according to an exemplary embodiment of the present application;
FIG. 5 is a partially exploded schematic illustration of a mixer assembly of a urea corrosion performance testing apparatus for diesel vehicle aftertreatment materials, provided in accordance with an exemplary embodiment of the application;
FIG. 6 is an exploded view of a sample wafer fixture assembly of a urea corrosion performance testing apparatus for a diesel vehicle aftertreatment material, according to an exemplary embodiment of the present application;
FIG. 7 is a flow chart of a method for testing urea corrosion resistance of a diesel vehicle aftertreatment material, according to an exemplary embodiment of the present application;
in the figure:
1. an air inlet pipe; 2. a temperature sensor; 3. a first aftertreatment component; 4. a first clip; 5. a mixer assembly; 6. a second clip; 7. a second aftertreatment component; 8. an air outlet pipe;
301. a first cylinder; 302. a diesel oxidation catalyst; 303. a diesel particulate filter; 501. a urea nozzle; 502. a nozzle base; 503. a heat shield; 504. swirl tube; 505. a Z-shaped partition plate; 506. a fixed flange; 507. a dailies fixing assembly; 508. a second cylinder; 509. thermal insulation cotton; 701. a third cylinder; 702. a selective catalytic reduction device;
5041. a swirl plate; 5051. a separator through hole; 5052. an air flow hole; 5061. a flange through hole; 5071. a bolt; 5072. a first fixed block; 5073. a sample piece of material; 50731. sample through hole; 5074. a second fixed block; 5075. and (3) a nut.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, in the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
The application will be further described with reference to the drawings and examples.
The urea corrosion resistance testing device of the diesel vehicle after-treatment device comprises an air inlet pipe 1, a temperature sensor 2, a first after-treatment component 3, a first clamp 4, a mixer component 5, a second clamp 6, a second after-treatment component 7 and an air outlet pipe 8, wherein the urea corrosion resistance testing device of the diesel vehicle after-treatment device is shown in the structural schematic diagram and the whole cross-section of the urea corrosion resistance testing device of the diesel vehicle after-treatment device shown in fig. 1 and 2; the inner spaces of the air inlet pipe 1, the first post-treatment component 3, the mixer component 5, the second post-treatment component 7 and the air outlet pipe 8 are sequentially communicated to form an air flow passage; the air inlet pipe 1 is fixedly connected with the first end of the first aftertreatment component 3, and optionally, the connection mode of the air inlet pipe 1 and the first aftertreatment component 3 comprises one of welding and integral forming; the second end of the first aftertreatment component 3 is fixedly connected with the first end of the mixer component 5 through the first clamp 4, so that the first aftertreatment component 3 and the mixer component 5 can be flexibly disassembled; the second end of the mixer assembly 5 is fixedly connected with the first end of the second aftertreatment assembly 7 through the second clamp 6, so that the mixer assembly 5 and the second aftertreatment assembly 7 can be flexibly disassembled; the second end of the second post-treatment component 7 is fixedly connected with the air outlet pipe 8, and optionally, the connection mode of the second post-treatment component 7 and the air outlet pipe 8 comprises one of welding and integral forming; the temperature sensor 2 is fixedly connected with the air inlet pipe 1, and optionally, the connection mode of the temperature sensor 2 and the air inlet pipe 1 includes, but is not limited to, one of welding, riveting, bolting and integrally forming, and the temperature sensor 2 is used for monitoring whether the temperature of the air flow discharged by the air inlet pipe 1 meets the injection requirement of the urea nozzle 501.
As shown in fig. 3 to 5, a cross-sectional view, an exploded view and a partially exploded view of a mixer assembly of a urea corrosion performance testing apparatus for a diesel vehicle after-treatment device according to an exemplary embodiment of the present application, the mixer assembly 5 includes a urea nozzle 501, a nozzle base 502, a cyclone tube 504, a Z-type partition 505, a fixing flange 506, a sample fixing assembly 507 and a second cylinder 508; the urea nozzle 501 is connected to the second cylinder 508 through a nozzle base 502, and the nozzle base 502 is communicated with the interior of the second cylinder 508 and is used for spraying urea output by the urea nozzle 501 into the second cylinder 508; swirl tube 504, Z-baffle 505, mounting flange 506, and dailies mounting assembly 507 are all positioned within second cylinder 508; the Z-shaped partition 505 is fixedly connected to the inner wall of the second cylinder 508, and optionally, the connection manner of the Z-shaped partition 505 and the second cylinder 508 includes, but is not limited to, one of welding, snap connection and bolt fixation; swirl tube 504 is fixedly connected to Z-shaped baffle 505, swirl tube 504 is positioned on the side of Z-shaped baffle 505 near nozzle base 502, optionally, the connection of swirl tube 504 to Z-shaped baffle 505 includes, but is not limited to, one of welding, snap-fit connection, bolting; the sample wafer holding assembly 507 is fixedly connected with the Z-shaped partition plate 505 through a fixing flange 506, and the sample wafer holding assembly 507 and the fixing flange 506 are positioned on one side of the Z-shaped partition plate 505 away from the nozzle base 502.
As shown in fig. 6, an exploded schematic view of a sample fixing assembly of a urea corrosion performance testing device for a diesel vehicle after-treatment device according to an exemplary embodiment of the present application is provided, where the sample fixing assembly 507 includes a material sample 5073, and the position of the material sample 5073 corresponds to the position of a swirl tube 504 and the position of a urea nozzle 501, so that a high-temperature air flow and the urea nozzle 501 are impacted on the material sample 5073 directly below the swirl tube 504 after undergoing a swirling mixing reaction through the swirl tube 504.
In the embodiment of the application, because ammonia decomposed at high temperature of urea has the characteristic of easy explosion, and ammonia water formed after dissolving in water has strong corrosion effect, high-temperature corrosion performance test is difficult to carry out in a high-temperature furnace, in the prior art, high-temperature air flow discharged by a burner is mostly adopted as an air source to simulate engine tail gas, but the difference between the high-temperature air component generated by the burner and the actual tail gas discharged by the engine is large, so that test error is caused. According to the application, the engine test bed is used for providing high-temperature tail gas, so that the corrosion of ammonia water to test equipment is reduced, the test equipment is more similar to the actual working condition, and the test result is more accurate.
In the embodiment of the application, the material sample 5073 is placed in a post-processor for testing, so that the material sample is more in line with the actual working state, and ammonia can be converted by the post-processor to prevent the ammonia from escaping into the atmosphere to pollute the environment.
In the embodiment of the application, when the test is started, the engine test bench is started, high-temperature tail gas starts to be discharged into the air inlet pipe 1 of the test device, the high-temperature tail gas is processed by the first post-processing component 3 and then reaches the mixer component 5, and the high-temperature tail gas flows to the lower material sample 5073 direction after passing through the cyclone pipe 504 due to the arrangement of the Z-shaped partition 505, and finally is discharged from the air outlet pipe 8 after being processed by the second post-processing component 7. In one example, the first aftertreatment component 3 is implemented as a diesel oxidation catalyst 302 and a diesel particulate filter 303, wherein the diesel oxidation catalyst 302 mainly oxidizes carbon monoxide CO and hydrocarbons HC, and the diesel particulate filter 303 can filter and capture particulate matter PM in the exhaust gas, so as to reduce the particulate matter PM in the exhaust gas. In one example, the second aftertreatment component 7 is implemented as an aftertreatment component that is centered on the selective catalytic reduction device 702, wherein the selective catalytic reduction device 702 converts harmful nitrogen oxide NOx emissions in the high temperature exhaust gas into harmless nitrogen and water. In the process, when the temperature sensor 2 monitors that the temperature of the high-temperature tail gas reaches 550 ℃, the urea nozzle 501 starts to spray urea, the urea and the high-temperature tail gas are impacted on the material sample 5073 right below the cyclone pipe 504 after cyclone mixing reaction of the cyclone pipe 504, the process that the real simulation postprocessor is corroded by urea in the whole car using process is realized, namely the real atmosphere and the real temperature in the real simulation postprocessor are changed, further the corrosion performance of urea decomposition products of postprocessor materials is accurately tested, and the working efficiency is improved.
As an alternative implementation manner, as shown in fig. 6, an exploded schematic view of a sample fixing assembly of a urea corrosion performance testing device for a diesel vehicle postprocessor material according to an exemplary embodiment of the present application, the sample fixing assembly 507 further includes two sets of bolts 5071, two sets of first fixing blocks 5072, two sets of second fixing blocks 5074, and two sets of nuts 5075; the two ends of the material sample 5073 are respectively provided with the same sample through holes 50731, the fixed flange 506 is provided with two groups of flange through holes 5061 corresponding to the sample through holes 50731, and the Z-shaped partition 505 is provided with two groups of partition through holes 5051 corresponding to the sample through holes 50731; the material sample 5073 is located between the first fixing block 5072 and the second fixing block 5074, and the bolts 5071 sequentially pass through the first fixing block 5072, the sample through holes 50731, the second fixing block 5074, the flange through holes 5061 and the partition through holes 5051 to be in threaded connection with the nuts 5075, so that the fixing of the material sample 5073 is realized.
As an alternative implementation manner, as shown in fig. 6, an exploded schematic view of a sample fixing assembly of a urea corrosion performance testing device for a diesel vehicle post-processor material according to an exemplary embodiment of the present application is shown, a side, where a first fixing block 5072 and a second fixing block 5074 are attached to a material sample 5073, is an inclined plane, an internal angle between the material sample 5073 and a fixing flange 506 is 30 ° to 60 °, and in an example, an internal angle between the material sample 5073 and the fixing flange 506 is 30 °; in another example, the material web 5073 makes an internal angle of 45 ° with the fixed flange 506; in another example, the material web 5073 makes an internal angle of 60 ° with the fixed flange 506; the Z-shaped partition 505 is also provided with an airflow hole 5052, and the airflow hole 5052 is matched with the cyclone tube 504; the mounting flange 506 is perpendicular to the central axis of the swirl tube 504, and the mounting flange 506, the airflow aperture 5052, the swirl tube 504, and the nozzle base 502 are coaxial, with the central axis of the swirl tube 504 being perpendicular to the central axis of the second barrel 508.
In the embodiment of the present application, the first fixing block 5072 and the second fixing block 5074 are provided with notches for alignment, and when the mounting material sample 5073 is aligned with the notches on the first fixing block 5072 and the second fixing block 5074, the angle of the inner included angle required by the material sample 5073 and the fixing flange 506 can be realized, so that the accuracy of the mounting angle of the material sample 5073 is ensured.
As an alternative embodiment, as shown in fig. 3 and 4, the mixer assembly 5 further comprises a heat shield 503 and insulation wool 509; the heat shield 503 is sleeved on the outer periphery of the second cylinder 508, and heat insulation cotton 509 is positioned between the heat shield 503 and the second cylinder 508.
In the embodiment of the application, the insulation cotton 509 is fixed to the periphery of the second cylinder 508 through the heat shield 503, so that the insulation performance of the mixer assembly 5 is improved.
As an alternative implementation manner, as shown in fig. 2, which is an overall cross-sectional view of a urea corrosion performance testing device for a diesel vehicle after-treatment material according to an exemplary embodiment of the present application, a first after-treatment assembly 3 includes a first cylinder 301, a diesel oxidation catalyst 302, and a diesel particulate filter 303, where the diesel oxidation catalyst 302 and the diesel particulate filter 303 are fixedly connected in the first cylinder 301; the diesel oxidation catalyst 302 is located on the side of the diesel particulate filter 303 remote from the mixer assembly 5; the first end of the first cylinder 301 is fixedly connected with the air inlet pipe 1, and optionally, the connection mode of the first cylinder 301 and the air inlet pipe 1 includes, but is not limited to, one of welding and integral molding; the second end of the first barrel 301 is secured to the first end of the mixer assembly 5 by a first clip 4.
As an alternative embodiment, the second aftertreatment assembly 7 includes a third cylinder 701 and a selective catalytic reduction device 702, the selective catalytic reduction device 702 being fixedly coupled within the third cylinder 701; the first end of the third cylinder 701 is fixedly connected to the second end of the mixer assembly 5 by the second clamp 6, and the second end of the third cylinder 701 is fixedly connected to the air outlet pipe 8, and optionally, the connection mode of the third cylinder 701 and the air outlet pipe 8 includes, but is not limited to, one of welding and integral molding.
As an alternative embodiment, the peripheral wall of the cyclone tube 504 is further vertically provided with a plurality of groups of cyclone plates 5041, and the cyclone plates 5041 of the groups are uniformly spaced about the central axis of the cyclone tube 504.
In the embodiment of the present application, the arrangement of the swirl plates 5041 on the swirl tube 504 can fully mix urea and high-temperature tail gas for reaction.
As an alternative embodiment, the air inlet pipe 1, the first aftertreatment component 3, the mixer component 5, the second aftertreatment component 7 and the air outlet pipe 8 are all coaxial.
The application also provides a urea corrosion resistance testing method of the diesel vehicle postprocessor material, which is suitable for the urea corrosion resistance testing device of the diesel vehicle postprocessor material, as shown in fig. 7, which is a flow diagram of the urea corrosion resistance testing method of the diesel vehicle postprocessor material, according to an exemplary embodiment of the application, and the method is applied to computer equipment and comprises the following steps:
in step 701, pre-test quality data and pre-test thickness data of a material sample 5073 are obtained, and the material sample 5073 is used for performing working condition test on a test bench through a urea corrosion resistance performance test device of a diesel vehicle post-processor material.
In the embodiment of the application, the test bed is realized as an engine test bed and is used for providing high-temperature tail gas for a urea corrosion resistance performance testing device of a diesel vehicle postprocessor material.
Step 702, sending a start signal to a test stand.
In the embodiment of the application, after the test bed receives the starting signal, the engine test bed is started, and high-temperature tail gas starts to be discharged into the air inlet pipe 1 of the testing device.
At 703, the exhaust temperature during the operating condition test is monitored.
In an embodiment of the application, the monitoring of the exhaust gas temperature in the test device according to the application is carried out by means of a temperature sensor 2.
In response to the exhaust temperature reaching the preset temperature threshold, a control signal is sent to the urea nozzle 501, the control signal directing the urea nozzle 501 to inject urea regularly.
In the embodiment of the application, the preset temperature threshold is 550 ℃.
In the embodiment of the present application, the injection rules include at least one of a urea injection frequency rule, a urea injection duration rule, and a urea injection interval time rule, and in one example, the control signal instructs the urea nozzle 501 to continuously inject urea for 8 hours according to the injection rules, and then stop injecting and cooling for 16 hours, and this step is mainly used for simulating the process of slowly corroding the material by ammonia water, and 10 continuous cycle tests are performed according to the above-mentioned cycle of continuously injecting urea for 8 hours and stopping injecting and cooling for 16 hours.
In step 705, the post-test quality data and the post-test thickness data of the material sample 5073 are obtained in response to receiving an end signal of the test stand, the end signal being used to instruct the urea nozzle 501 to complete execution of the injection rules.
In the embodiment of the application, after the test is finished, the corrosion layer on the material sample 5073 is removed by an acid washing method, and then the material sample is weighed to obtain the tested quality data.
Step 706, obtaining weight loss data of the material sample 5073 based on the pre-test quality data and the post-test quality data; based on the pre-test thickness data and the post-test thickness data, the thinning rate of the material sample 5073 is determined.
In the embodiment of the present application, the thinning rate of the material sample 5073 is calculated by slicing the material sample 5073 and observing the position of the greatest thinning of the material sample 5073 with a microscope
Step 707 evaluates the urea corrosion resistance of the material coupon 5073 based on the weight loss data and the thinning rate.
In embodiments of the application, the smaller the weight loss data and the thinning rate, the better the urea corrosion resistance of the material sample 5073.
In summary, the device and the method for testing the urea corrosion resistance of the diesel vehicle postprocessor material provided by the application realize the process of truly simulating the corrosion of the postprocessor by urea in the whole vehicle use process, namely truly simulating the change of the real atmosphere and the real temperature in the postprocessor, thereby accurately testing the corrosion resistance of the postprocessor material to urea decomposition products and improving the working efficiency.
The foregoing is only a preferred embodiment of the application, it being noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present application, and such modifications and adaptations are intended to be comprehended within the scope of the application.
Claims (10)
1. The urea corrosion resistance testing device of the diesel vehicle postprocessor material is characterized by comprising an air inlet pipe (1), a temperature sensor (2), a first postprocessing component (3), a first clamp (4), a mixer component (5), a second clamp (6), a second postprocessing component (7) and an air outlet pipe (8);
the internal space of the air inlet pipe (1), the first aftertreatment component (3), the mixer component (5), the second aftertreatment component (7) and the air outlet pipe (8) are sequentially communicated;
the air inlet pipe (1) is fixedly connected with the first end of the first aftertreatment component (3); the second end of the first aftertreatment component (3) is fixedly connected with the first end of the mixer component (5) through the first clamp (4); the second end of the mixer assembly (5) is fixedly connected with the first end of the second aftertreatment assembly (7) through the second clamp (6); the second end of the second post-treatment component (7) is fixedly connected with the air outlet pipe (8); the temperature sensor (2) is fixedly connected with the air inlet pipe (1);
the mixer assembly (5) comprises a urea nozzle (501), a nozzle base (502), a cyclone tube (504), a Z-shaped baffle (505), a fixed flange (506), a sample fixing assembly (507) and a second cylinder (508);
the urea nozzle (501) is connected to the second cylinder (508) through the nozzle base (502), and the nozzle base (502) is communicated with the interior of the second cylinder (508);
the cyclone tube (504), the Z-shaped partition plate (505), the fixed flange (506) and the sample wafer fixing assembly (507) are all positioned in the second cylinder (508); the Z-shaped partition plate (505) is fixedly connected with the inner wall of the second cylinder (508); the cyclone tube (504) is fixedly connected with the Z-shaped partition plate (505), and the cyclone tube (504) is positioned at one side of the Z-shaped partition plate (505) close to the nozzle base (502); the sample fixing assembly (507) is fixedly connected with the Z-shaped partition plate (505) through the fixing flange (506), and the sample fixing assembly (507) and the fixing flange (506) are positioned on one side, far away from the nozzle base (502), of the Z-shaped partition plate (505);
the coupon fixation assembly (507) comprises a material coupon (5073), the location of the material coupon (5073) corresponding to the location of the cyclone tube (504) and the urea nozzle (501).
2. The device for testing urea corrosion resistance of a diesel vehicle aftertreatment material according to claim 1, wherein said coupon fixing assembly (507) further comprises two sets of bolts (5071), two sets of first fixing blocks (5072), two sets of second fixing blocks (5074) and two sets of nuts (5075);
the two ends of the material sample wafer (5073) are respectively provided with the same sample wafer through holes (50731), the fixed flange (506) is provided with two groups of flange through holes (5061) corresponding to the sample wafer through holes (50731), and the Z-shaped partition plate (505) is provided with two groups of partition plate through holes (5051) corresponding to the sample wafer through holes (50731);
the material sample piece (5073) is located between the first fixed block (5072) and the second fixed block (5074), and the bolt (5071) sequentially penetrates through the first fixed block (5072), the sample piece through hole (50731), the second fixed block (5074), the flange through hole (5061) and the partition board through hole (5051) and the nut (5075) are in threaded connection.
3. The device for testing the urea corrosion resistance of the diesel vehicle postprocessor material according to claim 2, wherein one side of the first fixed block (5072) and the second fixed block (5074) attached to the material sample piece (5073) is an inclined plane, and an internal included angle between the material sample piece (5073) and the fixed flange (506) is 30-60 degrees;
the Z-shaped partition plate (505) is also provided with an airflow hole (5052), and the airflow hole (5052) is matched with the cyclone tube (504);
the fixing flange (506) is perpendicular to the central axis of the cyclone tube (504), the fixing flange (506), the airflow hole (5052), the cyclone tube (504) and the nozzle base (502) are coaxial, and the central axis of the cyclone tube (504) is perpendicular to the central axis of the second cylinder (508).
4. The device for testing the urea corrosion resistance of a diesel vehicle aftertreatment material according to claim 1, wherein the mixer assembly (5) further comprises a heat shield (503) and a heat insulating cotton (509);
the heat insulation cover (503) is sleeved on the periphery of the second cylinder (508), and the heat insulation cotton (509) is positioned between the heat insulation cover (503) and the second cylinder (508).
5. The device for testing the urea corrosion resistance of a diesel vehicle aftertreatment material according to claim 1, wherein the first aftertreatment component (3) comprises a first cylinder (301), a diesel oxidation catalyst (302) and a diesel particulate filter (303), and the diesel oxidation catalyst (302) and the diesel particulate filter (303) are fixedly connected in the first cylinder (301);
-the diesel oxidation catalyst (302) is located on the side of the diesel particulate filter (303) remote from the mixer assembly (5);
the first end of the first barrel (301) is fixedly connected with the air inlet pipe (1), and the second end of the first barrel (301) is fixedly connected with the first end of the mixer assembly (5) through the first clamp (4).
6. The device for testing the urea corrosion resistance of a diesel vehicle aftertreatment material according to claim 1, wherein the second aftertreatment component (7) comprises a third cylinder (701) and a selective catalytic reduction device (702), the selective catalytic reduction device (702) being fixedly connected within the third cylinder (701);
the first end of the third cylinder (701) is fixedly connected with the second end of the mixer assembly (5) through the second clamp (6), and the second end of the third cylinder (701) is fixedly connected with the air outlet pipe (8).
7. The device for testing the urea corrosion resistance of the diesel vehicle postprocessor material according to claim 1, wherein a plurality of groups of swirl plates (5041) are further vertically arranged on the peripheral wall of the swirl tube (504), and the swirl plates (5041) of the plurality of groups are uniformly distributed at intervals with respect to the central axis of the swirl tube (504).
8. The device for testing the urea corrosion resistance of a diesel vehicle aftertreatment material according to claim 1, characterized in that the air inlet pipe (1), the first aftertreatment component (3), the mixer component (5), the second aftertreatment component (7) and the air outlet pipe (8) are all coaxial.
9. A method for testing the urea corrosion resistance of a diesel vehicle after-treatment material, which is suitable for a device for testing the urea corrosion resistance of a diesel vehicle after-treatment material according to any one of claims 1 to 8, and is characterized in that the method is applied to computer equipment and comprises the following steps:
acquiring pre-test quality data and pre-test thickness data of the material sample (5073), wherein the material sample (5073) is used for performing working condition test on a test bed through a urea corrosion resistance performance test device of the diesel vehicle postprocessor material;
sending a starting signal to the test bed;
monitoring the exhaust temperature in the working condition test;
in response to the exhaust temperature reaching a preset temperature threshold, sending a control signal to the urea nozzle (501), the control signal instructing the urea nozzle (501) to inject urea in an injection schedule;
acquiring post-test quality data and post-test thickness data of the material sample (5073) in response to receiving an end signal of the test stand, the end signal being for indicating that the urea nozzle (501) completes execution of the injection rule;
obtaining weight loss data of the material sample (5073) based on the pre-test mass data and the post-test mass data; determining a thinning rate of the material sample (5073) based on the pre-test thickness data and the post-test thickness data;
based on the weight loss data and the thinning rate, the material sample (5073) is evaluated for urea corrosion resistance.
10. The method of claim 9, wherein the injection schedule comprises at least one of a urea injection number schedule, a urea injection duration schedule, and a urea injection interval schedule.
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| CN102507428A (en) * | 2011-10-19 | 2012-06-20 | 上海大学 | Condensed fluid corrosion simulation test device in automobile exhaust system |
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