Urea nozzle corrosion resistance testing device and testing method

Abstract

The present invention relates to a urea nozzle corrosion resistance performance detection device and detection method. The above-mentioned urea nozzle corrosion resistance performance detection device includes a fuel supply mechanism, a combustion mechanism, a test chamber, an injection mechanism and a control mechanism. The fuel supply mechanism is provided to store the fuel required for the test, the combustion mechanism is provided to burn the fuel to generate exhaust gas, and the test chamber is provided to form a fixed and controllable exhaust gas test environment. The nozzle of the injection mechanism is at least partially provided in the test chamber to simulate the assembly state of the urea nozzle on the vehicle post-processor, and the action of the fuel pump and the injection mechanism is controlled by providing a control mechanism. By obtaining the injection performance parameters of the injection mechanism at different times to reflect the corrosion resistance of the urea nozzle, a targeted, fast and efficient urea nozzle corrosion resistance test can be achieved without relying on engine bench and vehicle tests, and the test cycle can be greatly shortened and the cost of the test can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of exhaust gas post-treatment, and in particular to a urea nozzle corrosion resistance detection device and a detection method. Background Art

[0002] At present, the mainstream technology for diesel engine exhaust aftertreatment is selective catalytic reduction technology (SCR). In the SCR system, urea aqueous solution needs to be injected into the exhaust pipe in a timely and accurate manner. The atomization effect of the urea nozzle will affect the exhaust treatment efficiency of the system. In the actual use of the whole vehicle product, the head of the urea nozzle is prone to corrosion problems, causing abnormal injection, resulting in excessive emissions or insufficient vehicle power. Therefore, it is necessary to improve the corrosion resistance of the urea nozzle in the exhaust environment to prevent the occurrence of the above problems.

[0003] One of the main reasons for the corrosion of urea nozzles is that diesel engine exhaust contains acidic gases. When the urea aqueous solution is sprayed into the exhaust pipe, the acidic gas combines with water at the nozzle head and condenses to form acid liquid, which corrodes the metal material near the nozzle orifice, causing the spray cross-sectional area of ​​the nozzle to become smaller or blocked, resulting in poor atomization performance.

[0004] In order to solve the corrosion problem of urea nozzles, the corrosion resistance of urea nozzles needs to be tested to verify the effectiveness of improvement measures. The traditional testing method is to test and verify on the engine bench or vehicle. However, this method has a long cycle and high testing cost. Summary of the invention

[0005] Based on this, it is necessary to provide a urea nozzle corrosion resistance detection device and detection method to solve the problems of long cycle and high test cost of traditional detection methods.

[0006] One of the purposes of the present invention is to provide a device for detecting the corrosion resistance of a urea nozzle, the scheme of which is as follows:

[0007] A urea nozzle corrosion resistance testing device comprises a fuel supply mechanism, a combustion mechanism, a test chamber, an injection mechanism and a control mechanism;

[0008] The fuel supply mechanism includes an oil storage container, an oil pipeline and a fuel pump. The combustion mechanism has a combustion chamber and an oil inlet, an air inlet and an exhaust port respectively connected to the combustion chamber. The oil inlet is connected to the oil storage container through the oil pipeline. The fuel pump is arranged on the oil pipeline. The test chamber is connected to the exhaust port of the combustion mechanism. The injection mechanism has a urea nozzle, and the urea nozzle is at least partially arranged in the test chamber for injecting urea solution into the test chamber. The control mechanism is electrically connected to the fuel pump for controlling the pumping action of the fuel pump. The control mechanism is also electrically connected to the injection mechanism for controlling the injection action of the injection mechanism and obtaining the injection performance parameters of the injection mechanism at different times.

[0009] In one embodiment, there are multiple injection mechanisms, and the urea nozzles of the multiple injection mechanisms are oriented in different directions.

[0010] In one embodiment, the injection mechanism is detachably connected to the test chamber.

[0011] In one embodiment, the combustion mechanism is a diesel burner.

[0012] One of the purposes of the present invention is to provide a method for detecting the corrosion resistance of a urea nozzle, the scheme is as follows:

[0013] A method for detecting the corrosion resistance of a urea nozzle, using the urea nozzle corrosion resistance detection device described in any of the above embodiments, the method for detecting the corrosion resistance of a urea nozzle comprises the following steps:

[0014] Adding fuel into the oil storage container;

[0015] Turning on the combustion mechanism;

[0016] The control mechanism controls the fuel pump to pump the fuel to the combustion mechanism;

[0017] The control mechanism controls the injection mechanism to inject urea solution, and obtains injection performance parameters of the injection mechanism at different times.

[0018] In one of the embodiments, the injection frequency of the injection mechanism is 1 Hz to 4 Hz.

[0019] In one embodiment, multiple groups of tests are conducted, in which fuels with different corrosive element contents are added to the oil storage container to conduct the tests.

[0020] In one embodiment, the corrosive element is at least one of S and Cl.

[0021] In one embodiment, the injection performance parameter includes at least one of a driving pulse width, an injection pressure, an injection volume, and an atomized particle size.

[0022] In one of the embodiments, when one or more of the injection performance parameters drops to a set standard, the control mechanism controls the fuel pump and / or the injection mechanism to stop operating.

[0023] Compared with the traditional solution, the above urea nozzle corrosion resistance detection device and detection method have the following beneficial effects:

[0024] The above-mentioned urea nozzle corrosion resistance performance detection device and detection method are provided with a fuel supply mechanism to store the fuel required for the test, a combustion mechanism to burn the fuel to generate exhaust gas, and a test chamber to form a fixed and controllable exhaust gas test environment. The nozzle of the injection mechanism is at least partially arranged in the test chamber to simulate the assembly state of the urea nozzle on the vehicle post-processor, and the action of the fuel pump and the injection mechanism is controlled by the control mechanism. The above-mentioned urea nozzle corrosion resistance performance detection device reflects the corrosion resistance of the urea nozzle by obtaining the injection performance parameters of the injection mechanism at different times, and can realize targeted, fast and efficient urea nozzle corrosion resistance performance testing, without relying on engine bench and vehicle testing, and can greatly shorten the test cycle and reduce the cost of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The figure is a schematic structural diagram of a device for detecting the corrosion resistance of a urea nozzle according to an embodiment of the present invention.

[0026] Description of reference numerals:

[0027] 100. Urea nozzle corrosion resistance testing device; 110. Fuel supply mechanism; 111. Oil storage container; 1112. Fuel filling port; 1114. Oil outlet; 112. Oil pipeline; 113. Fuel pump; 120. Combustion mechanism; 121. Combustion chamber; 122. Fuel inlet; 123. Air inlet; 124. Exhaust port; 130. Test chamber; 140. Injection mechanism; 150. Control mechanism. DETAILED DESCRIPTION

[0028] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0029] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0030] In the description of the present invention, it should be understood that the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", and "third" may explicitly or implicitly include at least one of the features.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0032] A first aspect of the present invention provides a device for detecting the corrosion resistance of a urea nozzle.

[0033] Please refer to Figure 1 As shown, a urea nozzle corrosion resistance testing device 100 according to an embodiment includes a fuel supply mechanism 110 , a combustion mechanism 120 , a test chamber 130 , an injection mechanism 140 and a control mechanism 150 .

[0034] The fuel supply mechanism 110 includes an oil storage container 111, an oil delivery pipe 112, and a fuel pump 113. The combustion mechanism 120 has a combustion chamber 121, in which the fuel is supplied for combustion. The combustion mechanism 120 also has an oil inlet 122, an air inlet 123, and an exhaust port 124, and the oil inlet 122, the air inlet 123, and the exhaust port 124 are respectively connected to the combustion chamber 121. The oil inlet 122 of the combustion mechanism 120 is connected to the oil storage container 111 through the oil delivery pipe 112, and the fuel pump 113 is arranged on the oil delivery pipe 112, and the fuel pump 113 is used to pump the fuel stored in the oil storage container 111 to the combustion mechanism 120.

[0035] The test chamber 130 is communicated with the exhaust port 124 of the combustion mechanism 120 . The injection mechanism 140 has a urea nozzle. The urea nozzle is at least partially disposed in the test chamber 130 for injecting urea solution into the test chamber 130 .

[0036] The control mechanism 150 is electrically connected to the fuel pump 113 to control the pumping action of the fuel pump 113. The control mechanism 150 is also electrically connected to the injection mechanism 140 to control the injection action of the injection mechanism 140 and obtain the injection performance parameters of the injection mechanism 140 at different times.

[0037] The above-mentioned urea nozzle corrosion resistance performance testing device 100 is provided with a fuel supply mechanism 110 to store the fuel required for the test, a combustion mechanism 120 to burn the fuel to generate exhaust gas, and a test chamber 130 to form a fixed and controllable exhaust gas test environment. The nozzle of the injection mechanism 140 is at least partially arranged in the test chamber 130 to simulate the assembly state of the urea nozzle on the vehicle post-processor, and the action of the fuel pump 113 and the injection mechanism 140 is controlled by the control mechanism 150. The above-mentioned urea nozzle corrosion resistance performance testing device 100 reflects the corrosion resistance of the urea nozzle by obtaining the injection performance parameters of the injection mechanism 140 at different times, and can realize targeted, fast and efficient urea nozzle corrosion resistance performance testing, does not rely on engine bench and vehicle experiments, can greatly shorten the test cycle, and reduce the cost of the test.

[0038] like Figure 1 As shown, the oil storage container 111 has an oil storage cavity and a refueling port 1112 and an oil outlet 1114 respectively connected to the oil storage cavity. The refueling port 1112 is used to add fuel, and the oil outlet 1114 is connected to the oil delivery pipe 112.

[0039] Diesel with different contents of corrosive elements such as S and Cl can be added to the oil storage container 111 to study the effect of the content of corrosive elements in the fuel on the corrosion of the urea nozzle. In addition, other components that cause the urea nozzle to corrode and fail can be added in a targeted manner and the proportion can be adjusted to simulate the source components of the urea nozzle corrosion caused by the application of a real vehicle.

[0040] In one example, a diesel burner is selected as the combustion mechanism 120. The diesel burner is a core component of a diesel engine. By using the diesel burner as the combustion mechanism 120, the process of generating exhaust gas from the diesel engine combustion can be simulated, which is used to generate exhaust gas components that affect the injection performance of the urea nozzle, and realize the simulation of the gas medium that causes urea nozzle corrosion in actual vehicle applications.

[0041] The test chamber 130 can be designed to have a structure similar to that of an actual vehicle application environment, simulating the assembly state of the urea nozzle on the vehicle after-processor, and ensuring that the contact state between the high-temperature exhaust gas and the urea nozzle injection part is consistent with that during the actual vehicle operation.

[0042] It can be understood that the test chamber 130 is provided with an air release port to maintain the air pressure inside the test chamber 130 stable.

[0043] Optionally, the number of the injection mechanism 140 is not limited to only one, and there may be more than one. In one example, the number of the injection mechanism 140 is 2 to 10, and specifically, for example, may be 2, 3, 4, 5, 7, 9, etc.

[0044] In one example, there are multiple injection mechanisms 140 , and the urea nozzles of the multiple injection mechanisms 140 are oriented in different directions.

[0045] In the above example, by providing a plurality of injection mechanisms 140 with different orientations, the corrosion of the urea nozzle under different orientations can be studied, which can guide the design of the actual vehicle structure.

[0046] More specifically, the directions of the urea nozzles of the plurality of injection mechanisms 140 form different angles with the exhaust gas intake direction in the test chamber 130. The angle range is 10° to 90°, for example, 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, 90°, etc.

[0047] exist Figure 1 In the specific example shown, the exhaust gas inlet direction in the test chamber 130 is horizontal. There are two injection mechanisms 140, one of which is oriented perpendicular to the exhaust gas inlet direction in the test chamber 130, and the other injection mechanism 140 is oriented at an angle of 40° to 50° to the exhaust gas inlet direction in the test chamber 130.

[0048] In one example, the injection mechanism 140 is detachably connected to the test chamber 130 , so that the injection mechanism 140 installed on the test chamber 130 can be easily replaced.

[0049] Optionally, the injection performance parameter of the injection mechanism 140 may be, but is not limited to, at least one of a driving pulse width, an injection pressure, an injection volume, and an atomized particle size.

[0050] In one example, the injection performance parameters of the injection mechanism 140 include a driving pulse width, an injection pressure, an injection volume, and an atomized particle size.

[0051] In one example, during the continuous operation of the device, the injection performance parameters of the injection mechanism 140 are detected according to a set cycle and fed back to the control mechanism 150. The injection performance parameters of the injection mechanism 140 are monitored by the control mechanism 150. At the same time, data such as the operation time and fuel consumption are recorded.

[0052] In one example, when one or more of the injection performance parameters decreases to a corresponding set standard, the control mechanism 150 controls the fuel pump 113 and / or the injection mechanism 140 to stop operating.

[0053] In one example, when one or more of the injection performance parameters drops to a corresponding set standard, the control mechanism 150 controls the fuel pump 113 and the injection mechanism 140 to stop operating.

[0054] In one example, when all injection performance parameters drop to corresponding set standards, the control mechanism 150 controls the fuel pump 113 and / or the injection mechanism 140 to stop operating. Furthermore, when each injection performance parameter drops to the corresponding set standard, the corresponding operation time, fuel consumption and other data are recorded.

[0055] In addition, the control mechanism 150 controls the operating parameters such as the injection frequency and duty cycle of the injection mechanism 140. In one example, the injection frequency of the injection mechanism 140 is 1 Hz to 4 Hz, specifically, 1 Hz, 2 Hz, 3 Hz, 4 Hz, etc.

[0056] A second aspect of the present invention provides a method for detecting the corrosion resistance of a urea nozzle.

[0057] A method for detecting the corrosion resistance of a urea nozzle according to an embodiment of the present invention uses the above-mentioned urea nozzle corrosion resistance detection device 100, and comprises the following steps:

[0058] Step S1, adding fuel into the fuel storage container 111.

[0059] Step S2, start the combustion mechanism 120.

[0060] In step S3 , the control mechanism 150 controls the fuel pump 113 to pump fuel to the combustion mechanism 120 .

[0061] In step S4 , the control mechanism 150 controls the injection mechanism 140 to inject the urea solution, and obtains injection performance parameters of the injection mechanism 140 at different times.

[0062] The above-mentioned urea nozzle corrosion resistance performance detection method is provided by setting a fuel supply mechanism 110 to store the fuel required for the test, by setting a combustion mechanism 120 to burn the fuel to generate exhaust gas, by setting a test chamber 130 to form a fixed and controllable exhaust gas test environment, the urea nozzle of the injection mechanism 140 is at least partially arranged in the test chamber 130 to simulate the assembly state of the urea nozzle on the vehicle post-processor, and by setting a control mechanism 150 to control the action of the fuel pump 113 and the injection mechanism 140. The above-mentioned urea nozzle corrosion resistance performance detection device 100 reflects the corrosion resistance performance of the urea nozzle by obtaining the injection performance parameters of the injection mechanism 140 at different times, and can realize targeted, fast and efficient urea nozzle corrosion resistance performance testing, does not rely on engine bench and vehicle experiments, can greatly shorten the test cycle, and reduce the cost of the test.

[0063] In one example, multiple groups of tests were conducted, using fuels containing different amounts of corrosive elements, added to the fuel storage container 111, and tested to study the effect of the content of corrosive elements in the fuel on the corrosion of the urea nozzle. In addition, relevant components can be further added and the proportions can be adjusted to adjust the content of corrosive elements in the fuel.

[0064] The corrosive element may be, but is not limited to, at least one of S and Cl.

[0065] In one of the examples, urea solutions of different concentrations were used for testing to study the effect of urea solution concentration on the corrosion of urea nozzles.

[0066] In one example, the power and other working parameters of the combustion mechanism 120 are controlled to generate different exhaust gas flow rates, and the effect of the exhaust gas flow rate on the corrosion of the urea nozzle is studied.

[0067] In one example, the control mechanism 150 controls the operating parameters of the injection mechanism 140, such as the injection frequency and the duty cycle. In one example, the injection frequency of the injection mechanism 140 is 1 Hz to 4 Hz, such as 1 Hz, 2 Hz, 3 Hz, 4 Hz, etc.

[0068] Optionally, the injection performance parameter of the injection mechanism 140 may be, but is not limited to, at least one of a driving pulse width, an injection pressure, an injection volume, and an atomized particle size.

[0069] In one example, the injection performance parameters of the injection mechanism 140 include a driving pulse width, an injection pressure, an injection volume, and an atomized particle size.

[0070] In one example, during the continuous operation of the device, the injection performance parameters of the injection mechanism 140 are detected according to a set cycle and fed back to the control mechanism 150. The injection performance parameters of the injection mechanism 140 are monitored by the control mechanism 150. At the same time, data such as the operation time and fuel consumption are recorded.

[0071] The following specific examples are provided to further illustrate the present invention, but the present invention is not limited to the following examples. It should be understood that the attached claims summarize the scope of the present invention. Under the guidance of the concept of the present invention, those skilled in the art should realize that certain changes made to the various embodiments of the present invention will be covered by the spirit and scope of the claims of the present invention.

[0072] Example 1

[0073] The present embodiment provides a urea nozzle corrosion resistance testing device 100 , which includes a fuel supply mechanism 110 , a combustion mechanism 120 , a test chamber 130 , an injection mechanism 140 and a control mechanism 150 .

[0074] The fuel supply mechanism 110 includes a fuel storage container 111, a fuel delivery pipe 112 and a fuel pump 113. The fuel storage container 111 has a fuel storage cavity and a refueling port 1112 and a fuel outlet 1114 respectively connected to the fuel storage cavity. The refueling port 1112 is used to add fuel, and the fuel outlet 1114 is connected to the fuel delivery pipe 112.

[0075] The combustion mechanism 120 has a combustion chamber 121, in which fuel is burned. The combustion mechanism 120 also has an oil inlet 122, an air inlet 123 and an exhaust port 124, which are respectively connected to the combustion chamber 121. The oil inlet 122 of the combustion mechanism 120 is connected to the oil storage container 111 through an oil delivery pipe 112, and a fuel pump 113 is arranged on the oil delivery pipe 112, and the fuel pump 113 is used to pump the fuel stored in the oil storage container 111 to the combustion mechanism 120. The combustion mechanism 120 is a diesel burner.

[0076] The test chamber 130 is communicated with the exhaust port 124 of the combustion mechanism 120. The injection mechanism 140 is detachably mounted on the test chamber 130. The injection mechanism 140 has a urea nozzle, which is disposed in the test chamber 130 to inject urea solution into the test chamber 130. There is one injection mechanism 140, and the angle between the injection mechanism 140 and the exhaust gas intake direction (horizontal direction) in the test chamber 130 is 45°.

[0077] The control mechanism 150 is electrically connected to the fuel pump 113 to control the pumping action of the fuel pump 113. The control mechanism 150 is also electrically connected to the injection mechanism 140 to control the injection mechanism 140 to inject urea at a certain frequency and duty cycle, and to obtain the injection performance parameters of the injection mechanism 140 at different times. The injection performance parameters of the injection mechanism 140 include driving pulse width, injection pressure, injection amount, and atomized particle size.

[0078] When all the injection performance parameters drop to the corresponding set standards, the control mechanism 150 controls the fuel pump 113 and the injection mechanism 140 to stop operating. In addition, when each injection performance parameter drops to the corresponding set standard, the corresponding operation time, fuel consumption and other data are recorded.

[0079] Example 2

[0080] The present embodiment provides a urea nozzle corrosion resistance testing device 100. The present embodiment differs from the first embodiment in that there are two injection mechanisms 140, one of which is oriented perpendicular to the exhaust gas intake direction in the test chamber 130, and the other injection mechanism 140 is oriented at an angle of 45° to the exhaust gas intake direction in the test chamber 130.

[0081] Example 3

[0082] This embodiment provides a method for detecting the corrosion resistance of a urea nozzle. The detection method uses the urea nozzle corrosion resistance detection device 100 provided in Embodiment 2, and includes the following steps:

[0083] Add fuel to the oil storage container 111. Install the injection mechanism 140 on the test chamber 130 and confirm that the injection mechanism 140 works normally. The control mechanism 150 controls the fuel pump 113 to pump fuel to the combustion mechanism 120. Turn on the combustion mechanism 120 and confirm that exhaust gas is discharged from the exhaust port 124. The control mechanism 150 controls the injection mechanism 140 to spray urea solution into the test chamber 130 at a certain frequency and duty cycle. During the continuous operation of the device, the injection performance parameters of the injection mechanism 140 are detected according to the set cycle and fed back to the control mechanism 150. The control mechanism 150 monitors the injection performance parameters of the injection mechanism 140. At the same time, record data such as operation time and fuel consumption.

[0084] When all the injection performance parameters drop to the corresponding set standards, the control mechanism 150 controls the fuel pump 113 and the injection mechanism 140 to stop operating. In addition, when each injection performance parameter drops to the corresponding set standard, the corresponding operation time, fuel consumption and other data are recorded.

[0085] Multiple groups of tests were conducted, using fuel containing different contents of corrosive elements, added to the oil storage container 111, and tested to study the effect of the content of corrosive elements in the fuel on the corrosion of the urea nozzle. Urea solutions of different concentrations were used for testing to study the effect of the concentration of the urea solution on the corrosion of the urea nozzle. By controlling the power and other working parameters of the combustion mechanism 120 to generate different exhaust gas flow rates, the effect of the exhaust gas flow rate on the corrosion of the urea nozzle was studied. The injection mechanism 140 was controlled to inject urea solution into the test chamber 130 at different frequencies and duty cycles, and the effect of the injection frequency and duty cycle on the corrosion of the urea nozzle was studied.

[0086] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0087] The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims, and the description can be used to interpret the content of the claims.

Claims

1. A urea nozzle corrosion resistance detection device, characterized in that: It includes a fuel supply mechanism, a combustion mechanism, a test chamber, an injection mechanism and a control mechanism; The fuel supply mechanism includes an oil storage container, an oil pipeline and a fuel pump. The combustion mechanism has a combustion chamber and an oil inlet, an air inlet and an exhaust port respectively connected to the combustion chamber. The oil inlet is connected to the oil storage container through the oil pipeline. The fuel pump is arranged on the oil pipeline. The test chamber is connected to the exhaust port of the combustion mechanism. The injection mechanism has a urea nozzle, and the urea nozzle is at least partially arranged in the test chamber for injecting urea solution into the test chamber. The control mechanism is electrically connected to the fuel pump for controlling the pumping action of the fuel pump. The control mechanism is also electrically connected to the injection mechanism for controlling the injection action of the injection mechanism and obtaining the injection performance parameters of the injection mechanism at different times.

2. The urea nozzle corrosion resistance detection device according to claim 1, characterized in that: There are a plurality of the injection mechanisms, and the urea nozzles of the plurality of injection mechanisms are oriented in different directions.

3. The urea nozzle corrosion resistance detection device according to claim 1, characterized in that: The combustion mechanism is a diesel burner.

4. The urea nozzle corrosion resistance detection device according to any one of claims 1 to 3, characterized in that: The injection mechanism is detachably connected to the test chamber.

5. A method for detecting the corrosion resistance of a urea nozzle, characterized in that: Using the urea nozzle corrosion resistance performance detection device according to any one of claims 1 to 4, the urea nozzle corrosion resistance performance detection method comprises the following steps: Adding fuel into the oil storage container; Turning on the combustion mechanism; The control mechanism controls the fuel pump to pump the fuel to the combustion mechanism; The control mechanism controls the injection mechanism to inject urea solution, and obtains injection performance parameters of the injection mechanism at different times.

6. The method for detecting the corrosion resistance of a urea nozzle according to claim 5, characterized in that: The injection frequency of the injection mechanism is 1 Hz to 4 Hz.

7. The method for detecting the corrosion resistance of a urea nozzle according to claim 5, characterized in that: A plurality of tests were conducted, in which fuels with different corrosive element contents were added into the oil storage container to conduct the tests.

8. The method for detecting the corrosion resistance of a urea nozzle according to claim 7, characterized in that: The corrosive element is at least one of S and Cl.

9. The method for detecting the corrosion resistance of a urea nozzle according to any one of claims 5 to 8, characterized in that: The injection performance parameter includes at least one of a driving pulse width, an injection pressure, an injection amount, and an atomized particle size.

10. The method for detecting the corrosion resistance of a urea nozzle according to claim 9, characterized in that: When one or more of the injection performance parameters drops to a set standard, the control mechanism controls the fuel pump and / or the injection mechanism to stop operating.

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