Particle trap service life testing method and device

Abstract

The present invention provides a particle trap service life testing method and device, including: S1, passing smoke through the particle trap to measure the initial average filtration efficiency; S2, continuing to pass smoke, monitoring the filtration efficiency until it drops to an initial preset threshold, and regenerating; S3, passing smoke through the regenerated particle trap to measure the average filtration efficiency of the regenerated particle trap; S4, continuing to pass smoke, monitoring the filtration efficiency until it drops to a preset threshold, and continuing to regenerate; S5, repeating S3-S4; S6, constructing a fitting curve based on the initial average filtration efficiency #imgabs0#, the number of regenerations i, and the average filtration efficiency #imgabs1# corresponding to the particle trap after each regeneration, with the number of regenerations i as the independent variable and #imgabs2##imgabs3# as the dependent variables; S7, obtaining a life index representing the service life of the particle trap based on the fitting curve. The present invention characterizes the service life of the particle trap by using the life index of the fitting curve, filling the technical gap in the service life testing technology for particle trap manufacturers and buyers.

Description

Technical Field

[0001] The present invention relates to the technical field of particle trap service life testing, and in particular to a particle trap service life testing method and device. Background Art

[0002] With the increase in global vehicle emission limits, China has begun implementing the National VI exhaust emission regulations. These stringent regulations have provided a transformational opportunity for the development of domestic automotive technology and industry. Currently, traditional after-treatment technology routes such as EGR+DOC+DPF, pure SCR, or pure TWC for the National V stage can no longer meet the stringent requirements of the National VI stage for low temperature, high efficiency, long life, and full operating condition coverage. New and efficient after-treatment technologies, such as the integrated application of "oxidation catalyst (DOC) + diesel particulate filter (DPF) + selective catalytic reduction technology (SCR) + ammonia oxidation catalyst (ASC)" and "three-way catalytic converter (TWC) + gasoline particulate filter (GPF)", have become the standard for the National VI stage.

[0003] Particulate filters (GPF and DPF) utilize honeycomb ceramic filters as their primary component, playing a crucial role in capturing fine particulate matter emitted by internal combustion engines. However, the development of particulate filters in China started relatively late, with few manufacturers and relatively low production volumes. The technology and products are low-end, primarily used in the aftermarket and the "yellow-to-green" market. Honeycomb ceramics have long relied on imports. To overcome this foreign technological monopoly, a large number of honeycomb ceramic particle filter manufacturers have emerged in China. However, faced with the proliferation of particle filters on the domestic market, there is currently no standardized method or equipment for measuring their service life. In actual use, there is no mandatory scrapping age for honeycomb ceramic filters; they are generally replaced only after the vehicle's annual inspection if exhaust emissions exceed standards. Furthermore, industry standards for honeycomb ceramic production do not specify a specific service life for honeycomb ceramics, hindering the distinction between superior and inferior particle filters and their reliability during use. Therefore, evaluating the service life of honeycomb ceramics is essential. Summary of the Invention

[0004] The present invention provides a method and device for testing the service life of a particle catcher to solve the technical problems that there is currently no fixed method and equipment to detect the service life of the particle catchers that are emerging in the domestic market, and there is no regulation on the service life of honeycomb ceramics in the entire honeycomb ceramic production industry standard, making it impossible to distinguish the quality of the particle catchers produced by manufacturers and the reliability during use.

[0005] On the one hand, the present invention provides a method for testing the service life of a particle trap, comprising the following steps: S1, introducing standard smoke into the particle trap, and measuring the initial average filtration efficiency of the particle trap within a predetermined time. S2. Continue to introduce standard smoke into the particle trap, monitor the filtration efficiency of the particle trap in real time, and regenerate the particle trap when the filtration efficiency drops to the initial preset threshold value; S3. Pass standard smoke into the regenerated particle trap, and measure the average filtration efficiency of the regenerated particle trap within a predetermined time; S4. Continue to introduce standard smoke into the regenerated particle trap, monitor the filtration efficiency of the regenerated particle trap in real time, and continue to regenerate the regenerated particle trap when the filtration efficiency drops to the preset threshold value; S5. Repeat steps S3-S4; S6. Based on the initial average filtration efficiency Number of regeneration processes i, average filtration efficiency of the particle trap after each regeneration process Taking the number of regeneration treatments i as the independent variable, Constructing a fitting curve for the dependent variable; S7, based on the fitting curve, obtaining a life index characterizing the service life of the particle trap.

[0006] Compared with the prior art, the present invention has the following advantages: the test method of the present invention is based on the initial average filtration efficiency of the particle trap Average filtration efficiency of the particle collector after each regeneration The service life of the particle filter is characterized by the life index of the fitting curve. In the face of the endless number of particle filters on the domestic market, the produced particle filter can be separated from the car engine for service life testing before the particle filter is put into use, eliminating the influence of the engine's thermal efficiency, displacement, engine pipeline design, the oil used, etc. on the service life of the particle filter itself, effectively distinguishing the quality of the particle filter and the reliability during use, providing manufacturers with classification criteria such as product qualification rate and product quality, and providing buyers with purchase selection suggestions in terms of service life, filling the technical gap of manufacturers and buyers in testing the service life of particle filters, and helping to fill the provisions on the service life of honeycomb ceramics in the entire honeycomb ceramic production industry standard. In addition, during the actual use of the particle filter, the service life of the particle filter can be used as a label that comes with it to estimate its service life, and there is no need to replace it based on the exhaust gas exceeding the standard during the annual inspection of the car as in the traditional method.

[0007] In some embodiments of the present invention, the standard smoke is a mixture of nanoscale graphite, quartz particles, a solvent, and a dispersant, wherein the nanoscale graphite has a particle size of 0.1-2.5 μm, the quartz particles have a particle size of 0.1-2.5 μm, the solvent is anhydrous ethanol, and the dispersant is one or more of sodium hexametaphosphate, sodium tripolyphosphate, and triethylhexyl phosphoric acid. Preferably, the standard smoke is a mixture of 1-4 parts nanoscale graphite, 1-2 parts quartz particles, 3-8 parts solvent, and 0.01-0.03 parts dispersant, by weight.

[0008] The beneficial effect of adopting the above-mentioned further technical solution is that the smoke used in the present invention is a mixture of nano-graphite, quartz particles, solvent and dispersant. Through the design of particle size, the smoke of the present invention meets the PM particle size and can be used as a standard smoke. Through the design of dosage, the particle content of the present invention reaches 20%-60%, which is a specially formulated standard smoke source with a higher smoke source concentration, which can greatly shorten the experimental time. The test time of the test method of the present invention can be controlled within 5 hours.

[0009] In some embodiments of the present invention, the predetermined time is 1-2 minutes, and the initial average filtration efficiency is The average filtration efficiency of the particle trap after the regeneration treatment is obtained by measuring a filtration efficiency every 1-2 seconds within a predetermined time and averaging all the filtration efficiencies measured within the predetermined time.

[0010] The beneficial effect of adopting the above-mentioned further technical solution is that the average filtration efficiency is sampled at a predetermined time of 1-2 minutes, and a sample (filtration efficiency) is taken every 1-2 seconds. All the samples taken are added together and divided by the number of sampling times to obtain the average filtration efficiency. The life test is carried out based on the average filtration efficiency, which reduces errors and is more accurate.

[0011] In some embodiments of the present invention, the calculation formula for the filtration efficiency is: Among them, C is the filtration efficiency, A1 is the concentration of standard smoke before passing through the particle collector, and A2 is the concentration of standard smoke after passing through the particle collector.

[0012] The beneficial effect of adopting the above-mentioned further technical solution is that the present invention defines the filtration efficiency formula. In combination with the device designed by the present invention, the filtration efficiency can be effectively calculated through the formula, and the calculation method is simple.

[0013] In some embodiments of the present invention, the initial preset threshold is the initial average filtration efficiency The preset threshold value is 10% of the first measured filtration efficiency corresponding to the average filtration efficiency of the particle trap after each regeneration process, and the first measured filtration efficiency corresponds to 10%.

[0014] The beneficial effect of adopting the above further technical solution is that when the present invention is not subjected to regeneration treatment, the initial average filtration efficiency is The corresponding first measured filtration efficiency (i.e. the initial average filtration efficiency 10% of the filtration efficiency measured for the first time within the corresponding predetermined time) is used as the initial preset threshold to judge the timing of the first regeneration treatment; the first measured filtration efficiency corresponding to the average filtration efficiency of the particle trap after each regeneration treatment (that is, the filtration efficiency measured for the first time within the predetermined time corresponding to the average filtration efficiency of the particle trap after each regeneration treatment, such as, after the first regeneration treatment, the filtration efficiency measured for the first time within the predetermined time for the average filtration efficiency of the particle trap after the first regeneration treatment; after the second regeneration treatment, the filtration efficiency measured for the first time within the predetermined time for the average filtration efficiency of the particle trap after the second regeneration treatment) is used as the preset threshold to judge the timing of the next regeneration treatment. The preset threshold is a variable value, which changes continuously with the increase in the number of regenerations. The variable value can better determine the timing of the next regeneration and improve the accuracy of the life test.

[0015] In some embodiments of the present invention, the regeneration process is as follows: placing the particle trap in an oxidizing atmosphere furnace, keeping the temperature at 550° C.-650° C., taking it out and cooling it to obtain a regenerated particle trap.

[0016] The beneficial effect of adopting the above-mentioned further technical solution is that the regeneration treatment is carried out at 550℃-650℃ in an oxidizing atmosphere, which can effectively burn off the carbon deposits in the particulate filter after filtering for a period of time, thereby ensuring that the filtration efficiency of the particulate filter can be continuously tested to obtain its service life.

[0017] In some embodiments of the present invention, the fitting curve is a first-order linear fitting curve, and the life index is the absolute value of the slope of the first-order linear fitting curve. The larger the absolute value of the slope, the shorter the service life of the particle trap.

[0018] The beneficial effect of adopting the above-mentioned further technical solution is that the fitting curve of the present invention is a first-order linear fitting curve, and the life index is the absolute value of the slope of the first-order linear fitting curve. The larger the absolute value of the slope, the steeper the slope of the first-order linear fitting curve, the faster the descent, and the shorter the service life of the particle trap, which can vividly and intuitively reflect the service life of the particle trap.

[0019] On the other hand, the present invention also provides a device for the particle trap service life test method described in any of the above items, comprising: a sprayer, a first concentration detector, a particle trap storage unit, and a second concentration detector; wherein the sprayer is used to provide standard smoke; the first concentration detector is located between the sprayer and the particle trap storage unit, and is used to detect the concentration of the standard smoke before it passes through the particle trap; the particle trap storage unit is located between the first concentration detector and the second concentration detector, and is used to place the particle trap; the second concentration detector is used to detect the concentration of the standard smoke after it passes through the particle trap.

[0020] Compared with the prior art, the present invention has the following beneficial effects: the device of the present invention includes a sprayer, a first concentration detector, a particle trap storage unit and a second concentration detector, the sprayer provides standard smoke, the first concentration detector detects the concentration of the standard smoke before it passes through the particle trap, the particle trap storage unit places the particle trap, and the second concentration detector detects the concentration of the standard smoke after it passes through the particle trap. The device of the present invention is simple and can be used in conjunction with the testing method of the present invention to effectively test the service life of the particle trap.

[0021] In some embodiments of the present invention, the device also includes a spray collector and an oxidizing atmosphere furnace. The spray collector is located at one end of the second concentration detector away from the particle trap storage unit and is used to collect the gas filtered by the particle trap. When regeneration treatment is required, the particle trap is removed from the particle trap storage unit and moved into the oxidizing atmosphere furnace for regeneration treatment. After the treatment is completed, the regenerated particle trap is removed from the oxidizing atmosphere furnace and moved into the particle trap storage unit.

[0022] The beneficial effect of adopting the above-mentioned further technical solution is that the device of the present invention also includes a spray collector and an oxidizing atmosphere furnace. The spray collector is used to collect the gas filtered by the particle collector to avoid pollution to the environment; the oxidizing atmosphere furnace (a high-temperature furnace that can provide an oxidizing atmosphere) is used to regenerate the particle collector; the device designed by the present invention can realize the conversion of the particle collector in the filtration efficiency test and regeneration treatment device.

[0023] In some embodiments of the present invention, the sprayer and the particle trap in the particle trap storage unit are connected through a first pipe, and the first concentration detector is connected to the first pipe; the particle trap in the particle trap storage unit and the spray collector are connected through a second pipe, and the second concentration detector is connected to the second pipe.

[0024] The beneficial effect of adopting the above-mentioned further technical solution is that the sprayer, particle collector and spray collector are connected in sequence through the pipeline, which facilitates the passage of standard smoke into the particle collector and the collection of gas filtered by the particle collector; the first concentration detector is connected to the first pipeline, and the second concentration detector is connected to the second pipeline, which facilitates the detection of the concentration of the standard smoke before and after passing through the particle collector. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings required for use in the embodiments of the present invention will be described below.

[0026] Figure 1 A flow chart of a method for testing the service life of a particle trap according to an embodiment of the present invention;

[0027] Figure 2 A fitting curve diagram of an embodiment of the present invention;

[0028] Figure 3 This is a simplified structural diagram of a device for a particle trap service life testing method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0029] In order to make the objectives, technical solutions and advantages of the present invention more clear, various aspects of the present invention will be described in detail below in conjunction with specific embodiments. However, these specific embodiments are only used to illustrate the present invention and do not constitute any limitation on the scope of protection and substantive content of the present invention.

[0030] Example 1:

[0031] This embodiment provides a method for testing the service life of a particle trap. Figure 1 The flowchart of the particle trap service life test method of this embodiment is shown. Figure 2 shows the fitting curve diagram of this embodiment, Figure 3 A simplified structural diagram of a device for testing the service life of a particle trap according to this embodiment is shown.

[0032] like Figure 1 As shown, the particle trap service life test method of this embodiment includes the following steps: S1, passing standard smoke into the particle trap, and measuring the initial average filtration efficiency of the particle trap within a predetermined time. S2. Continue to introduce standard smoke into the particle trap, monitor the filtration efficiency of the particle trap in real time, and regenerate the particle trap when the filtration efficiency drops to the initial preset threshold value; S3. Pass standard smoke into the regenerated particle trap, and measure the average filtration efficiency of the regenerated particle trap within a predetermined time; S4. Continue to introduce standard smoke into the regenerated particle trap, monitor the filtration efficiency of the regenerated particle trap in real time, and continue to regenerate the regenerated particle trap when the filtration efficiency drops to the preset threshold value; S5. Repeat steps S3-S4; S6. Based on the initial average filtration efficiency Number of regeneration processes i, average filtration efficiency of the particle trap after each regeneration process The number of regeneration treatments i is the independent variable, Construct a fitting curve for the dependent variable; S7. Based on the fitting curve, obtain a life index that characterizes the service life of the particle trap.

[0033] In this embodiment, the standard smoke is a mixture of nano-graphite, quartz particles, a solvent, and a dispersant. The nano-graphite has a particle size of 0.1-2.5 μm, the quartz particles have a particle size of 0.1-2.5 μm, the solvent is anhydrous ethanol, and the dispersant is one or more of sodium hexametaphosphate, sodium tripolyphosphate, and triethylhexylphosphonic acid. Preferably, by weight, the standard smoke comprises 1-4 parts nano-graphite, 1-2 parts quartz particles, 3-8 parts solvent, and 0.01-0.03 parts dispersant.

[0034] In this embodiment, the predetermined time is 1-2 minutes, and the initial average filtration efficiency is The average filtration efficiency of the particle trap after the regeneration treatment is obtained by measuring a filtration efficiency every 1-2 seconds within a predetermined time and averaging all the filtration efficiencies measured within the predetermined time.

[0035] In this embodiment, the calculation formula for filtration efficiency is: Among them, C is the filtration efficiency, A1 is the concentration of standard smoke before passing through the particle collector, and A2 is the concentration of standard smoke after passing through the particle collector.

[0036] In this embodiment, the initial preset threshold is the initial average filtration efficiency The corresponding first measured filtration efficiency (i.e. the initial average filtration efficiency The first filtration efficiency measured within the corresponding predetermined time, that is, the initial average filtration efficiency The preset threshold value is 10% of the filtration efficiency measured at the 1st to 2nd seconds within the corresponding test time of 1-2 minutes), and the preset threshold value is 10% of the first measured filtration efficiency corresponding to the average filtration efficiency of the particle trap after each regeneration treatment (that is, the filtration efficiency measured for the first time within the predetermined time corresponding to the average filtration efficiency of the particle trap after each regeneration treatment, such as, after the first regeneration treatment, the filtration efficiency measured at the 1st to 2nd seconds within the test time of 1-2 minutes for the average filtration efficiency of the particle trap after the first regeneration treatment; after the second regeneration treatment, the filtration efficiency measured at the 1st to 2nd seconds within the test time of 1-2 minutes for the average filtration efficiency of the particle trap after the second regeneration treatment).

[0037] In this embodiment, the regeneration process is as follows: placing the particle trap in an oxidizing atmosphere furnace (an oxidizing atmosphere furnace is a high-temperature furnace that can provide an oxidizing atmosphere), keeping it warm at 550°C-650°C, taking it out and cooling it to obtain a regenerated particle trap.

[0038] In this embodiment, the fitting curve is obtained by the initial average filtration efficiency when the regeneration process number i=0. And the average filtration efficiency of the particle trap after each regeneration process when the number of regeneration processes i ≥ 1 The discrete data composed of is fitted, and the specific fitting method is a common fitting method in this field and will not be described here. Figure 2 As shown, the fitting curve is a first-order linear fitting curve, that is, a first-order linear function, the formula is: Y = KX, where Y represents the initial average filtration efficiency Average filtration efficiency of the particle collector after each regeneration process X represents the number of regeneration treatments i (i = 0, 1, 2, 3, ...), the value of i is not limited, and those skilled in the art can use it according to the average filtration efficiency The numerical value of is reasonably selected, for example, the maximum value of i satisfies the average filtration efficiency measured for the i-th time The value is less than the initial average filtration efficiency 5%-10% (i.e. when the regeneration process is done for the i-th time, if the average filtration efficiency measured for the i-th time is The value is less than the initial average filtration efficiency If the filter efficiency is 5%-10%, regeneration is stopped, and the acquisition of the average filtration efficiency is stopped. A fitting curve is obtained based on all the discrete data acquired. The absolute value of K represents the life index, that is, the absolute value of the slope of the first-order linear fitting curve represents the life index. For different particle traps, the larger the absolute value of the slope, the shorter the service life of the particle trap.

[0039] This embodiment also provides a device for testing the service life of a particle trap according to this embodiment. Figure 3 As shown, the device of this embodiment includes: a sprayer, a first concentration detector, a particle trap storage unit, and a second concentration detector. The sprayer is used to provide standard smoke; the first concentration detector is located between the sprayer and the particle trap storage unit and is used to detect the concentration of the standard smoke before it passes through the particle trap; the particle trap storage unit (not shown in the figure, only the particle trap is shown) is located between the first and second concentration detectors and is used to house the particle trap; and the second concentration detector is used to detect the concentration of the standard smoke after it passes through the particle trap.

[0040] In this embodiment, the apparatus further includes a spray collector and an oxidizing atmosphere furnace. The spray collector is located at the end of the second concentration detector away from the particle trap storage unit and is used to collect gas filtered by the particle trap. When regeneration is required, the particle trap is removed from the particle trap storage unit and placed in the oxidizing atmosphere furnace for regeneration. After regeneration is complete, the regenerated particle trap is removed from the oxidizing atmosphere furnace and placed in the particle trap storage unit.

[0041] In this embodiment, the sprayer and the particle trap in the particle trap storage unit are connected through a first pipe, and the first concentration detector is connected to the first pipe; the particle trap in the particle trap storage unit and the spray collector are connected through a second pipe, and the second concentration detector is connected to the second pipe.

[0042] Example 2:

[0043] This embodiment provides a method and device for testing the service life of a particle trap. The device for testing the service life of a particle trap in this embodiment is the same as that in Example 1, and will not be described in detail here. Only the method for testing the service life of a particle trap in this embodiment will be described.

[0044] The particle trap service life test method of this embodiment includes the following steps: S1, passing standard smoke into the particle trap, and measuring the initial average filtration efficiency of the particle trap within a predetermined time. S2. Continue to introduce standard smoke into the particle trap, monitor the filtration efficiency of the particle trap in real time, and regenerate the particle trap when the filtration efficiency drops to the initial preset threshold value; S3. Pass standard smoke into the regenerated particle trap, and measure the average filtration efficiency of the regenerated particle trap within a predetermined time; S4. Continue to introduce standard smoke into the regenerated particle trap, monitor the filtration efficiency of the regenerated particle trap in real time, and continue to regenerate the regenerated particle trap when the filtration efficiency drops to the preset threshold value; S5. Repeat steps S3-S4; S6. Based on the initial average filtration efficiency Number of regeneration processes i, average filtration efficiency of the particle trap after each regeneration process The number of regeneration treatments i is the independent variable, Construct a fitting curve for the dependent variable; S7. Based on the fitting curve, obtain a life index that characterizes the service life of the particle trap.

[0045] In this embodiment, the standard smoke is a mixture of nano-graphite, quartz particles, a solvent, and a dispersant. The nano-graphite has a particle size of 0.1-2.5 μm, the quartz particles have a particle size of 0.1-2.5 μm, the solvent is anhydrous ethanol, and the dispersant is one or more of sodium hexametaphosphate, sodium tripolyphosphate, and triethylhexylphosphonic acid. Preferably, by weight, the standard smoke is a mixture of 1 part nano-graphite, 1 part quartz particles, 3 parts solvent, and 0.01 part dispersant.

[0046] In this embodiment, the predetermined time is 1 minute, and the initial average filtration efficiency is The average filtration efficiency of the particle trap after the regeneration treatment is obtained by measuring a filtration efficiency every 1 second within a predetermined time and averaging all the filtration efficiencies measured within the predetermined time.

[0047] In this embodiment, the calculation formula for filtration efficiency is: Among them, C is the filtration efficiency, A1 is the concentration of standard smoke before passing through the particle collector, and A2 is the concentration of standard smoke after passing through the particle collector.

[0048] In this embodiment, the initial preset threshold is the initial average filtration efficiency The corresponding first measured filtration efficiency (i.e. the initial average filtration efficiency The first filtration efficiency measured within the corresponding predetermined time, that is, the initial average filtration efficiency The preset threshold value is 10% of the filtration efficiency measured at the first second within the corresponding test time of 1 minute). The preset threshold value is 10% of the filtration efficiency measured for the first time corresponding to the average filtration efficiency of the particle trap after each regeneration treatment (that is, the filtration efficiency measured for the first time within the predetermined time corresponding to the average filtration efficiency of the particle trap after each regeneration treatment, such as, after the first regeneration treatment, the filtration efficiency measured at the first second within the test time of 1 minute for the average filtration efficiency of the particle trap after the first regeneration treatment; after the second regeneration treatment, the filtration efficiency measured at the first second within the test time of 1 minute for the average filtration efficiency of the particle trap after the second regeneration treatment).

[0049] In this embodiment, the regeneration process is as follows: placing the particle trap in an oxidizing atmosphere furnace (an oxidizing atmosphere furnace is a high-temperature furnace that can provide an oxidizing atmosphere), keeping it warm at 550°C, taking it out and cooling it to obtain a regenerated particle trap.

[0050] In this embodiment, the fitting curve is obtained by the initial average filtration efficiency when the regeneration process number i=0. And the average filtration efficiency of the particle trap after each regeneration process when the number of regeneration processes i ≥ 1 The discrete data composed of the above equations are fitted, and the specific fitting method is a common fitting method in this field and will not be described here. In this embodiment, the fitting curve is a first-order linear fitting curve, that is, a first-order linear function, and the formula is: Y = KX, where Y represents the initial average filtration efficiency. Average filtration efficiency of the particle collector after each regeneration process X represents the number of regeneration treatments i (i = 0, 1, 2, 3, ...), the value of i is not limited, and those skilled in the art can use it according to the average filtration efficiency The numerical value of is reasonably selected, for example, the maximum value of i satisfies the average filtration efficiency measured for the i-th time The value is less than the initial average filtration efficiency 5%-10% (i.e. when the regeneration process is done for the i-th time, if the average filtration efficiency measured for the i-th time is The value is less than the initial average filtration efficiency If the filter efficiency is 5%-10%, regeneration is stopped, and the acquisition of the average filtration efficiency is stopped. A fitting curve is obtained based on all the discrete data acquired. The absolute value of K represents the life index, that is, the absolute value of the slope of the first-order linear fitting curve represents the life index. For different particle traps, the larger the absolute value of the slope, the shorter the service life of the particle trap.

[0051] Example 3:

[0052] This embodiment provides a method and device for testing the service life of a particle trap. The device for testing the service life of a particle trap in this embodiment is the same as that in Example 1, and will not be described in detail here. Only the method for testing the service life of a particle trap in this embodiment will be described.

[0053] The particle trap service life test method of this embodiment includes the following steps: S1, passing standard smoke into the particle trap, and measuring the initial average filtration efficiency of the particle trap within a predetermined time. S2. Continue to introduce standard smoke into the particle trap, monitor the filtration efficiency of the particle trap in real time, and regenerate the particle trap when the filtration efficiency drops to the initial preset threshold value; S3. Pass standard smoke into the regenerated particle trap, and measure the average filtration efficiency of the regenerated particle trap within a predetermined time; S4. Continue to introduce standard smoke into the regenerated particle trap, monitor the filtration efficiency of the regenerated particle trap in real time, and continue to regenerate the regenerated particle trap when the filtration efficiency drops to the preset threshold value; S5. Repeat steps S3-S4; S6. Based on the initial average filtration efficiency Number of regeneration processes i, average filtration efficiency of the particle trap after each regeneration process The number of regeneration treatments i is the independent variable, Construct a fitting curve for the dependent variable; S7. Based on the fitting curve, obtain a life index that characterizes the service life of the particle trap.

[0054] In this embodiment, the standard smoke is a mixture of nano-graphite, quartz particles, a solvent, and a dispersant. The nano-graphite has a particle size of 0.1-2.5 μm, the quartz particles have a particle size of 0.1-2.5 μm, the solvent is anhydrous ethanol, and the dispersant is one or more of sodium hexametaphosphate, sodium tripolyphosphate, and triethylhexylphosphonic acid. Preferably, by weight, the standard smoke is a mixture of 4 parts nano-graphite, 2 parts quartz particles, 8 parts solvent, and 0.03 parts dispersant.

[0055] In this embodiment, the predetermined time is 2 minutes, and the initial average filtration efficiency is The average filtration efficiency of the particle trap after the regeneration treatment is obtained by measuring a filtration efficiency every 2 seconds within a predetermined time and averaging all the filtration efficiencies measured within the predetermined time.

[0056] In this embodiment, the calculation formula for filtration efficiency is: Among them, C is the filtration efficiency, A1 is the concentration of standard smoke before passing through the particle collector, and A2 is the concentration of standard smoke after passing through the particle collector.

[0057] In this embodiment, the initial preset threshold is the initial average filtration efficiency The corresponding first measured filtration efficiency (i.e. the initial average filtration efficiency The first filtration efficiency measured within the corresponding predetermined time, that is, the initial average filtration efficiency The preset threshold value is 10% of the filtration efficiency measured at the 2nd second within the corresponding test time of 2 minutes), and the preset threshold value is 10% of the filtration efficiency measured for the first time corresponding to the average filtration efficiency of the particle trap after each regeneration treatment (that is, the filtration efficiency measured for the first time within the predetermined time corresponding to the average filtration efficiency of the particle trap after each regeneration treatment, such as, after the first regeneration treatment, the filtration efficiency measured at the 2nd second within the test time of 2 minutes for the average filtration efficiency of the particle trap after the first regeneration treatment; after the second regeneration treatment, the filtration efficiency measured at the 2nd second within the test time of 2 minutes for the average filtration efficiency of the particle trap after the second regeneration treatment).

[0058] In this embodiment, the regeneration process is as follows: placing the particle trap in an oxidizing atmosphere furnace (an oxidizing atmosphere furnace is a high-temperature furnace that can provide an oxidizing atmosphere), keeping it warm at 650°C, taking it out and cooling it to obtain a regenerated particle trap.

[0059] In this embodiment, the fitting curve is obtained by the initial average filtration efficiency when the regeneration process number i=0. And the average filtration efficiency of the particle trap after each regeneration process when the number of regeneration processes i ≥ 1 The discrete data composed of the above equations are fitted, and the specific fitting method is a common fitting method in this field and will not be described here. In this embodiment, the fitting curve is a first-order linear fitting curve, that is, a first-order linear function, and the formula is: Y = KX, where Y represents the initial average filtration efficiency. Average filtration efficiency of the particle collector after each regeneration process X represents the number of regeneration treatments i (i = 0, 1, 2, 3, ...), the value of i is not limited, and those skilled in the art can use it according to the average filtration efficiency The numerical value of is reasonably selected, for example, the maximum value of i satisfies the average filtration efficiency measured for the i-th time The value is less than the initial average filtration efficiency 5%-10% (i.e. when the regeneration process is done for the i-th time, if the average filtration efficiency measured for the i-th time is The value is less than the initial average filtration efficiency If the filter efficiency is 5%-10%, regeneration is stopped, and the acquisition of the average filtration efficiency is stopped. A fitting curve is obtained based on all the discrete data acquired. The absolute value of K represents the life index, that is, the absolute value of the slope of the first-order linear fitting curve represents the life index. For different particle traps, the larger the absolute value of the slope, the shorter the service life of the particle trap.

[0060] Example 4:

[0061] This embodiment provides a method and device for testing the service life of a particle trap. The device for testing the service life of a particle trap in this embodiment is the same as that in Example 1, and will not be described in detail here. Only the method for testing the service life of a particle trap in this embodiment will be described.

[0062] The particle trap service life test method of this embodiment includes the following steps: S1, passing standard smoke into the particle trap, and measuring the initial average filtration efficiency of the particle trap within a predetermined time. S2. Continue to introduce standard smoke into the particle trap, monitor the filtration efficiency of the particle trap in real time, and regenerate the particle trap when the filtration efficiency drops to the initial preset threshold value; S3. Pass standard smoke into the regenerated particle trap, and measure the average filtration efficiency of the regenerated particle trap within a predetermined time; S4. Continue to introduce standard smoke into the regenerated particle trap, monitor the filtration efficiency of the regenerated particle trap in real time, and continue to regenerate the regenerated particle trap when the filtration efficiency drops to the preset threshold value; S5. Repeat steps S3-S4; S6. Based on the initial average filtration efficiency Number of regeneration processes i, average filtration efficiency of the particle trap after each regeneration process The number of regeneration treatments i is the independent variable, Construct a fitting curve for the dependent variable; S7. Based on the fitting curve, obtain a life index that characterizes the service life of the particle trap.

[0063] In this embodiment, the standard smoke is a mixture of nano-graphite, quartz particles, a solvent, and a dispersant. The nano-graphite has a particle size of 0.1-2.5 μm, the quartz particles have a particle size of 0.1-2.5 μm, the solvent is anhydrous ethanol, and the dispersant is one or more of sodium hexametaphosphate, sodium tripolyphosphate, and triethylhexylphosphonic acid. Preferably, by weight, the standard smoke is a mixture of 2 parts nano-graphite, 1.5 parts quartz particles, 5 parts solvent, and 0.02 parts dispersant.

[0064] In this embodiment, the predetermined time is 1.5 min, and the initial average filtration efficiency is The average filtration efficiency of the particle trap after the regeneration treatment is obtained by measuring a filtration efficiency every 1.5 seconds within a predetermined time and averaging all the filtration efficiencies measured within the predetermined time.

[0065] In this embodiment, the calculation formula for filtration efficiency is: Among them, C is the filtration efficiency, A1 is the concentration of standard smoke before passing through the particle collector, and A2 is the concentration of standard smoke after passing through the particle collector.

[0066] In this embodiment, the initial preset threshold is the initial average filtration efficiency The corresponding first measured filtration efficiency (i.e. the initial average filtration efficiency The first filtration efficiency measured within the corresponding predetermined time, that is, the initial average filtration efficiency The preset threshold value is 10% of the filtration efficiency measured at the 1.5th second within the corresponding test time of 1.5 minutes), and the preset threshold value is 10% of the first measured filtration efficiency corresponding to the average filtration efficiency of the particle trap after each regeneration treatment (that is, the filtration efficiency measured for the first time within the predetermined time corresponding to the average filtration efficiency of the particle trap after each regeneration treatment, such as, after the first regeneration treatment, the filtration efficiency measured at the 1.5th second within the test time of 1.5 minutes for the average filtration efficiency of the particle trap after the first regeneration treatment; after the second regeneration treatment, the filtration efficiency measured at the 1.5th second within the test time of 1.5 minutes for the average filtration efficiency of the particle trap after the second regeneration treatment).

[0067] In this embodiment, the regeneration process is as follows: placing the particle trap in an oxidizing atmosphere furnace (an oxidizing atmosphere furnace is a high-temperature furnace that can provide an oxidizing atmosphere), keeping it warm at 600°C, taking it out and cooling it to obtain a regenerated particle trap.

[0068] In this embodiment, the fitting curve is obtained by the initial average filtration efficiency when the regeneration process number i=0. And the average filtration efficiency of the particle trap after each regeneration process when the number of regeneration processes i ≥ 1 The discrete data composed of the above equations are fitted, and the specific fitting method is a common fitting method in this field and will not be described here. In this embodiment, the fitting curve is a first-order linear fitting curve, that is, a first-order linear function, and the formula is: Y = KX, where Y represents the initial average filtration efficiency. Average filtration efficiency of the particle collector after each regeneration process X represents the number of regeneration treatments i (i = 0, 1, 2, 3, ...), the value of i is not limited, and those skilled in the art can use it according to the average filtration efficiency The numerical value of is reasonably selected, for example, the maximum value of i satisfies the average filtration efficiency measured for the i-th time The value is less than the initial average filtration efficiency 5%-10% (i.e. when the regeneration process is done for the i-th time, if the average filtration efficiency measured for the i-th time is The value is less than the initial average filtration efficiency If the filter efficiency is 5%-10%, regeneration is stopped, and the acquisition of the average filtration efficiency is stopped. A fitting curve is obtained based on all the discrete data acquired. The absolute value of K represents the life index, that is, the absolute value of the slope of the first-order linear fitting curve represents the life index. For different particle traps, the larger the absolute value of the slope, the shorter the service life of the particle trap.

[0069] The present invention has been described above with reference to specific embodiments. These embodiments are merely exemplary and are not intended to limit the scope of protection of the present invention. Those skilled in the art may make various modifications, variations, or substitutions without departing from the essence of the present invention. Therefore, various equivalent variations made according to the present invention are still within the scope of the present invention.

Claims

1. A particle trap service life testing method, characterized in that: The following steps are involved: S1. Introduce standard smoke into the particle collector and measure the initial average filtration efficiency of the particle collector within a predetermined time. S2. Continue to introduce standard smoke into the particle trap and monitor the filtration efficiency of the particle trap in real time. When the filtration efficiency drops to an initial preset threshold, regenerate the particle trap. S3, introducing standard smoke into the regenerated particulate filter, and measuring the average filtration efficiency of the regenerated particulate filter within a predetermined time; S4, continue to introduce standard smoke into the regenerated particulate filter, monitor the filtration efficiency of the regenerated particulate filter in real time, and continue to regenerate the regenerated particulate filter when the filtration efficiency drops to a preset threshold; S5, repeat steps S3-S4; S6, based on initial average filtration efficiency Number of regeneration processes i, average filtration efficiency of the particle trap after each regeneration process The number of regeneration treatments i is the independent variable, A fitting curve is constructed for the dependent variable. If the value of the average filtration efficiency measured for the i-th time is less than 5%-10% of the initial average filtration efficiency, regeneration is stopped. S7. Based on the fitting curve, a life index characterizing the service life of the particle trap is obtained. The fitting curve is a first-order linear fitting curve, and the life index is the absolute value of the slope of the first-order linear fitting curve. The larger the absolute value of the slope, the shorter the service life of the particle trap.

2. The particle trap service life testing method according to claim 1, wherein: The standard smoke is a mixture of nano-scale graphite, quartz particles, a solvent and a dispersant, wherein the particle size of the nano-scale graphite is 0.1-2.5 μm, the particle size of the quartz particles is 0.1-2.5 μm, the solvent is anhydrous ethanol, and the dispersant is one or more of sodium hexametaphosphate, sodium tripolyphosphate, and triethylhexyl phosphoric acid. In parts by weight, the standard smoke is a mixture of 1-4 parts of nano-scale graphite, 1-2 parts of quartz particles, 3-8 parts of solvent and 0.01-0.03 parts of dispersant.

3. The particle trap service life testing method according to claim 1, wherein: The predetermined time is 1-2 minutes, and the initial average filtration efficiency The average filtration efficiency of the particle trap after the regeneration treatment is obtained by measuring a filtration efficiency every 1-2 seconds within a predetermined time and averaging all the filtration efficiencies measured within the predetermined time.

4. The particle trap service life testing method according to claim 3, wherein: The filtration efficiency The calculation formula is: Among them, C is the filtration efficiency, A1 is the concentration of standard smoke before passing through the particle collector, and A2 is the concentration of standard smoke after passing through the particle collector.

5. The particle trap service life testing method according to claim 1, wherein: The initial preset threshold is the initial average filtration efficiency The preset threshold is 10% of the first measured filtration efficiency corresponding to the average filtration efficiency of the particle trap after each regeneration process, and the first measured filtration efficiency corresponds to 10%.

6. The particle trap service life testing method according to claim 1, wherein: The regeneration process comprises placing the particle trap in an oxidizing atmosphere furnace, keeping the temperature at 550° C. to 650° C., taking the particle trap out and cooling the furnace to obtain the regenerated particle trap.

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