JP6448440B2 - Measuring apparatus and measuring method for measuring solid component collection efficiency of diesel particulate filter - Google Patents

Description

  The present invention relates to a measuring apparatus and a measuring method for measuring the collection efficiency of a solid component of a diesel particulate filter.

  The exhaust gas discharged from a diesel engine is particulate matter such as soot (soot) containing carbon as a main component that causes environmental pollution (particulate matter (hereinafter sometimes referred to as “PM”)). Is contained in large quantities. Therefore, a filter (diesel particulate filter (hereinafter sometimes referred to as “DPF”)) for removing (collecting) PM contained in the exhaust gas is usually attached to the exhaust system of the diesel engine. .

  Conventionally, as a means for evaluating the performance of a DPF, a method of actually operating a diesel engine, generating exhaust gas containing PM, supplying the exhaust gas to the DPF, and measuring the PM collection efficiency is known. Yes. Further, as another means, there is known a method of using a burner device to generate exhaust gas containing PM, supplying the exhaust gas to the DPF, and measuring the PM collection efficiency. In addition, the burner apparatus for generating the waste gas containing PM is disclosed by patent documents 1-4, for example.

  Further, ash is contained in the exhaust gas discharged from the diesel engine as a solid component other than PM, and this ash is also collected in the DPF in the same manner as PM. Since ash cannot be removed by combustion unlike PM such as soot, it is accumulated during a long period of use of the DPF, which greatly affects the collection efficiency and pressure loss. Conventionally, in order to examine the effect of such ash accumulation, ash is deposited on the DPF by a method such as mounting a DPF on an actual vehicle and running tens of thousands to hundreds of thousands km, or turning the engine for a long time Or measuring the collection efficiency of ash.

JP 2007-155708 A JP 2007-155712 A JP 2010-223882 A Japanese Patent No. 5548639

  However, when measuring the PM collection efficiency of DPF, the conventional measurement method using an actual diesel engine or burner device uses combustible fuel to generate exhaust gas containing PM. It was necessary to ensure safety. In addition, there is a problem that a measuring apparatus becomes large and it takes time to generate PM. Furthermore, in order to accumulate ash on the DPF and to measure the ash collection efficiency, a method of running a real vehicle equipped with the DPF for a long distance or turning the engine for a long period of time requires a lot of time and cost. There was a problem.

  The present invention has been made in view of such problems of the prior art. An object of the present invention is to provide a measuring apparatus and a measuring method capable of measuring the collection efficiency of solid components (PM and ash) of DPF more quickly and simply than before.

  According to the present invention, the following measuring apparatus and measuring method are provided.

[1] An air supply device that sends air to a diesel particulate filter, an exhaust device that draws air sent from the air supply device to the diesel particulate filter from the diesel particulate filter and discharges the air to the outside, Simulated solids that intermittently supply particulate simulated solid components simulating solid components contained in exhaust gas discharged from a diesel engine into the air sent from the air supply device to the diesel particulate filter at a constant cycle A measuring device for measuring the solid component collection efficiency of a diesel particulate filter, provided with a component supply device (excluding those equipped with an engine or a burner device) .

[2] The measuring apparatus according to [1], wherein the simulated solid component is one or more kinds of particles selected from the group consisting of carbon black simulating particulate matter and non-combustible particles simulating ash.

[3] The measuring device according to [2], wherein the incombustible particles are quicklime particles.

[4] The measuring device according to any one of [1] to [3], wherein the air supply device is a dry air supply device.

[5] The measurement device according to any one of [1] to [4], wherein the exhaust device is an inverter type blower.

[6] A storage container in which the simulated solid component supply device stores the simulated solid component and has a hole in the bottom, and an impeller disposed below the storage container and rotatable in a certain direction. The measuring device according to any one of [1] to [5], which is provided above the air supply device.
[7] The impeller has a rotational axis perpendicular to the vertical direction, and the impeller has a V-shaped space formed between adjacent blades when viewed from the side surface direction. The measuring apparatus according to [6].

[ 8 ] Using the measuring device according to any one of [1] to [ 7 ], air containing the simulated solid component is fed into the diesel particulate filter over a certain period of time, and at the same time, the air is supplied to the diesel particulate filter. By pulling out from the diesel particulate filter, the diesel particulate filter collects the simulated solid component, and the simulated solid component supply device causes the air to be sent from the air supply device to the diesel particulate filter. A diesel particulate filter that measures the solid component collection efficiency of the diesel particulate filter from the mass of the supplied simulated solid component and the mass of the simulated solid component collected by the diesel particulate filter. Of measuring solid component collection efficiency.

  According to the measuring device of the present invention, since the collection efficiency of the solid component of DPF can be measured without using an engine or a burner device, it is not necessary to ensure safety associated with the use of combustible fuel. Further, the structure of the apparatus can be simplified. This also makes it possible to reduce the size of the device. Furthermore, since a simulated solid component simulating the solid component (PM or ash) actually generated from the diesel engine is used, it does not take a long time to generate and accumulate the solid component. For this reason, the time and cost required for measurement can be reduced, and quick and simple measurement is possible. Furthermore, since the supply of the simulated solid component to the air fed into the DPF is intermittently performed at a constant cycle, the way of diffusion and the flow rate of the simulated solid component in the air flow is different from the solid component in the actual exhaust gas. It becomes a state close to the way of diffusion and flow rate. As a result, it is possible to measure the collection efficiency with high accuracy.

  The measuring method of the present invention measures the collection efficiency of the solid component of DPF using the measuring apparatus of the present invention. For this reason, according to the measuring method of the present invention, the above-described effects obtained by the measuring apparatus of the present invention can be enjoyed. Moreover, the measurement method of the present invention includes the simulated solid component supply device, the mass of the simulated solid component supplied into the air sent from the air supply device to the DPF, and the mass of the simulated solid component collected in the DPF. From this, the collection efficiency of the solid component of DPF is obtained. For this reason, it is also possible to measure the collection efficiency using a simulated solid component of a color other than black (for example, quicklime particles used as a simulated solid component simulating ash) that cannot be measured with a smoke meter.

It is a side view showing typically one embodiment of a measuring device of the present invention. It is sectional drawing which shows typically the simulation solid component supply apparatus in one Embodiment of the measuring apparatus of this invention. It is a perspective view which shows typically an example of the structure of DPF. It is sectional drawing of the cross section parallel to the length direction of DPF which shows an example of the structure of DPF typically. It is a graph which shows the relationship between the collection efficiency of the solid component of DPF calculated | required by the measuring method of this invention, and the collection efficiency of the solid component of DPF calculated | required by the conventional measuring method.

  Embodiments of the present invention will be described below. The present invention is not limited to the following embodiments, and appropriate modifications and improvements are added to the following embodiments on the basis of ordinary knowledge of those skilled in the art without departing from the spirit of the present invention. It should be understood that what has been described also falls within the scope of the invention.

(1) Measuring device:
FIG. 1 is a side view schematically showing one embodiment of the measuring apparatus of the present invention. FIG. 2 is a cross-sectional view schematically showing a simulated solid component supply apparatus in one embodiment of the measurement apparatus of the present invention. The measuring device 10 of the present invention is used for measuring the collection efficiency of the solid component of the DPF 1, and includes an air supply device 2, an exhaust device 3, and a simulated solid component supply device 4.

  The air supply device 2 is for sending air into the DPF 1. The air supply device 2 is preferably one that can control the flow rate of the air fed into the DPF 1. For example, a dry air supply device, a blower, a compressor, or the like can be suitably used. The exhaust device 3 is for extracting the air sent into the DPF 1 from the air supply device 2 from the DPF 1 and discharging it to the outside. The exhaust device 3 is preferably capable of controlling the flow rate of air drawn from the DPF 1. For the exhaust device 3, for example, an inverter type blower can be suitably used. The air supply device 2 and the exhaust device 3 form an air flow (air flow) as indicated by an arrow in FIG.

  The simulated solid component supply device 4 intermittently interrupts the particulate simulated solid component 5 simulating the solid component contained in the exhaust gas discharged from the diesel engine in the air sent from the air supply device 2 to the DPF 1 at a constant cycle. It is intended to supply. As shown in FIG. 2, the simulated solid component supply device 4 preferably includes a storage container 11 and an impeller 12 that can rotate in a certain direction. In this case, the simulated solid component supply device 4 is disposed above the air supply device 2. The storage container 11 is for storing the simulated solid component 5 and has a hole 15 at the bottom. The impeller 12 is disposed below the container 11 and can be rotated in a certain direction (for example, clockwise) by a driving device (not shown) such as a motor.

  In the impeller 12, a substantially V-shaped space 14 is formed between adjacent blades 13 when viewed from the side. In the simulated solid component supply device 4 shown in FIG. 2, the space 14 is used to supply the simulated solid component 5 to the air sent from the air supply device 2 to the DPF 1. Specifically, first, in the process in which the impeller 12 rotates, when the space 14 is at the uppermost position A, the simulated solid component 5 stored in the storage container 11 is reduced by gravity through the hole 15 at the bottom. Falls into the space 14. Then, when the space 14 reaches the lowest position C due to the rotation of the impeller 12, the simulated solid component 5 contained in the space 14 falls downward due to gravity. The simulated solid component 5 that has fallen downward from the space 14 is supplied (mixed) into the air sent to the DPF 1 from the air supply device 2 below the simulated solid component supply device 4, and is sent to the DPF 1 together with the air.

  A certain period of time is required until the simulated solid component 5 contained in the next space 14 falls after the simulated solid component 5 contained in the space 14 falls. That is, the space 14 at the position B immediately before the predetermined space 14 has reached the position C from the time when the predetermined space 14 has reached the lowest position C, and then has been stored in the space 14. A certain time is required until the simulated solid component 5 falls. For this reason, in the simulated solid component supply device 4 shown in FIG. 2, the supply of the simulated solid component 5 into the air sent from the air supply device 2 to the DPF 1 is intermittently performed at a constant cycle. The position B is a position one position before the position C in the rotation direction of the impeller 12. The amount of solid components (PM and ash) contained in the exhaust gas actually discharged from the diesel engine is not constant, and increases and decreases in small increments. Therefore, the state of the exhaust gas actually discharged from the diesel engine can be simulated by intermittently supplying the simulated solid component 5 using such a simulated solid component supply device 4. As a result, it is possible to accurately measure the collection efficiency of the solid component of the DPF 1 under conditions close to those during actual use. The simulated solid component supply device 4 is preferably capable of controlling the rotational speed of the impeller 12. By making the rotational speed of the impeller 12 controllable, it is possible to adjust the cycle for supplying the simulated solid component 5 into the air sent from the air supply device 2 to the DPF 1. As a result, it is possible to more accurately simulate (reproduce) the state of the exhaust gas actually discharged from the diesel engine.

  The simulated solid component 5 supplied by the simulated solid component supply device 4 is preferably one or more kinds of particles selected from the group consisting of carbon black simulating PM and non-combustible particles simulating ash. Moreover, it is preferable that the nonflammable particle | grains which simulated the ash are quick lime particle | grains. The component of carbon black is similar to the component of PM contained in the exhaust gas actually discharged from the diesel engine. Further, carbon black having various particle sizes is commercially available. Therefore, what has a particle size comparable to PM contained in the exhaust gas actually discharged from the diesel engine is easily available. The component of quicklime particles is similar to the component of ash contained in the exhaust gas actually discharged from the diesel engine. Furthermore, quicklime particles are non-flammable and cannot be burned off like ash. Therefore, by using carbon black that simulates PM, incombustible particles such as quick lime particles that simulate ash, or both, as the simulated solid component 5, the collection efficiency of the solid component of DPF1 can be improved during actual use. It becomes possible to measure accurately under close conditions.

  The simulated solid component 5 supplied by the simulated solid component supply device 4 may be only carbon black simulating PM or only non-combustible particles simulating ash. In this case, the PM collection efficiency or the ash collection efficiency can be measured independently. The collection efficiency of ash is effective data for estimating the amount of ash accumulated in the DPF when the DPF is used over a long period of time.

  Further, the simulated solid component 5 supplied by the simulated solid component supply device 4 may be a mixture of carbon black simulating PM and incombustible particles simulating ash. Exhaust gas discharged from a diesel engine contains PM such as soot that can be removed by combustion and ash that cannot be removed by combustion. Therefore, if ash accumulates due to the use of DPF over a long period of time, it greatly affects the collection efficiency and pressure loss. Therefore, when using a mixture of carbon black simulating PM and incombustible particles simulating ash as the simulated solid component 5, in an environment closer to the case where the DPF is mounted on the exhaust system of an actual diesel engine, The collection efficiency can be measured.

  As the simulated solid component 5 supplied by the simulated solid component supply device 4, it is preferable to use a component having a particle size comparable to that of the solid component contained in the exhaust gas actually discharged from the diesel engine. The range of the particle size (average particle size) of the simulated solid component 5 is preferably 5 to 1000 nm. By using such a simulated solid component 5, it is possible to more accurately simulate (reproduce) the state of exhaust gas actually discharged from the diesel engine.

  As shown in FIG. 1, it is preferable that the measuring apparatus 10 of the present invention has a holder 17 that houses the DPF 1 that is a measurement target and fixes the DPF 1 at a predetermined position. The holder 17 preferably has a structure that contacts only the outer peripheral surface of the DPF 1 so as not to prevent air from the air supply device 2 toward the exhaust device 3 from passing through the DPF 1.

  In the measuring device 10 of the present invention, as shown in FIG. 1, the air supply device 2 and the exhaust device 3 are in a positional relationship such that they are aligned in a straight line with the DPF 1 to be measured interposed therebetween. It is preferable that they are arranged. Moreover, it is preferable that a pipe 16 is provided between the air supply device 2 and the DPF 1 and between the DPF 1 and the exhaust device 3. Then, it is preferable that air is supplied to the DPF 1 by the air supply device 2 and air is extracted from the DPF 1 by the exhaust device 3 through these pipes 16.

  According to the measuring device of the present invention, since the collection efficiency of the solid component of DPF can be measured without using an engine or a burner device, it is not necessary to ensure safety associated with the use of combustible fuel. Further, since no engine or burner device is used, the structure of the device can be simplified. This also makes it possible to reduce the size of the device. Furthermore, since a simulated solid component simulating the solid component (PM or ash) actually generated from the diesel engine is used, it does not take a long time to generate and accumulate the solid component. For this reason, the time and cost required for measurement can be reduced, and quick and simple measurement is possible. Furthermore, since the supply of the simulated solid component to the air fed into the DPF is intermittently performed at a constant cycle, the way of diffusion and the flow rate of the simulated solid component in the air flow is different from the solid component in the actual exhaust gas. It becomes a state close to the method of diffusion and the flow rate, and measurement with high accuracy is possible.

(2) Measuring method:
The measuring method of the present invention measures the collection efficiency of the solid component of DPF using the measuring apparatus of the present invention. Specifically, using the measuring apparatus 10 of the present invention, the air containing the simulated solid component 5 is fed into the DPF 1 over a certain period of time, and at the same time, the air is extracted from the DPF 1 so that the simulated solid component 5 is added to the DPF 1. To collect. Thereafter, from the mass of the simulated solid component 5 supplied into the air sent from the air supply device 2 to the DPF 1 by the simulated solid component supply device 4 and the mass of the simulated solid component 5 collected in the DPF 1, the DPF 1 The collection efficiency of the solid component is obtained. Specifically, the collection efficiency is determined by the simulated solid component supply device 4, the mass of the simulated solid component 5 supplied to the air sent from the air supply device 2 to the DPF 1, and the simulation collected by the DPF 1. From the mass of the solid component 5, it can be calculated by the following formula (1). In the following equation (1), the “simulated solid component supply amount” is the mass of the simulated solid component 5 supplied by the simulated solid component supply device 4 into the air sent from the air supply device 2 to the DPF 1. The “simulated solid component collection amount” is the mass of the simulated solid component 5 collected in the DPF 1. The “simulated solid component collection amount” is a value obtained by capturing the simulated solid component 5 from the mass of the DPF 1 after the simulated solid component 5 is collected by the DPF 1 (the mass of the DPF 1 including the collected simulated solid component 5). It is a value obtained by subtracting the mass of DPF1 before collection.
Collection efficiency (%) = simulated solid component collection amount / simulated solid component supply amount × 100 (1)

  In the conventional measurement method of measuring the PM collection efficiency by supplying exhaust gas containing PM generated by an engine or a burner device to the DPF, the collection efficiency is generally measured using a smoke meter. It was the target. That is, smoke meters were installed before and after the DPF, the amount of PM contained in the exhaust gas before and after passing through the DPF was measured, and the PM collection efficiency was obtained from those measured values. However, the smoke meter can measure the amount of black solid components such as soot from the measurement principle, but cannot measure the amount of solid components other than black such as ash. On the other hand, in the measurement method of the present invention for obtaining the collection efficiency as described above, collection is performed using a simulated solid component of a color other than black (for example, quick lime particles used as a simulated solid component simulating ash). It is also possible to measure the efficiency.

  Since the measuring method of the present invention uses the measuring apparatus of the present invention, it is not necessary to ensure safety associated with the use of combustible fuel. Further, instead of the solid component (PM or ash) actually generated from the diesel engine, a simulated solid component simulating it is used. Therefore, the measurement method of the present invention does not require a long time for generation and accumulation of solid components. For this reason, the time and cost required for measurement can be reduced, and quick and simple measurement is possible. Furthermore, in the measurement method of the present invention, the supply of the simulated solid component to the air fed into the DPF is intermittently performed at a constant cycle. For this reason, the diffusion method and flow rate of the simulated solid component in the air flow are close to the diffusion method and flow rate of the solid component in the actual exhaust gas. As a result, accurate measurement can be performed. In the measurement method of the present invention, as described above, it is also possible to measure the collection efficiency using a simulated solid component of a color other than black that cannot be measured with a smoke meter.

(3) DPF (measuring object):
FIG. 3 is a perspective view schematically showing an example of the structure of a DPF to be measured by the measuring apparatus and measuring method of the present invention, and FIG. 4 is a cross-sectional view of a cross section parallel to the length direction of the DPF. is there.

  As shown in FIGS. 3 and 4, the DPF 1 normally includes a honeycomb structure portion 20 and a plugging portion 21. The honeycomb structure portion 20 has a porous partition wall 22 that partitions and forms a plurality of cells 23 extending from an inflow end surface 24 that is an end surface on the exhaust gas G inflow side to an outflow end surface 25 that is an end surface on the exhaust gas G outflow side. . The plugging portion 21 is disposed at one end of the plurality of cells 23 on the inflow end surface 24 side or the outflow end surface 25 side. Some of the plurality of cells 23 are inlet plugged cells 23 b whose ends are plugged with plugged portions 21 on the inflow end face 24 side of the honeycomb structure portion 20. The remaining cells among the plurality of cells 23 are outlet plugged cells 23 a whose end portions are plugged with plugged portions 21 on the outflow end face 25 side of the honeycomb structure portion 20.

  When the DPF 1 having such a structure is used for removing solid components such as PM contained in the exhaust gas G, the exhaust gas G first flows into the outlet plugged cell 23a from the inflow end face 24. Thereafter, the exhaust gas G passes through the porous partition wall 22 and moves into the inlet plugged cell 23b. When the exhaust gas G passes through the porous partition wall 22, the partition wall 22 becomes a filtration layer, and the solid component in the exhaust gas G is captured by the partition wall 22 and deposited on the partition wall 22. Thus, the exhaust gas G from which the solid component has been removed then flows out from the outflow end face 25 to the outside.

  Note that the DPF 1 shown in FIGS. 3 and 4 is an example of a DPF to be measured by the measurement apparatus and the measurement method of the present invention. The measuring object of the measuring apparatus and measuring method of the present invention is not limited to the DPF having such a structure. That is, any filter that has a structure capable of collecting solid components contained in exhaust gas discharged from a diesel engine and can be used as a DPF in practice is included in the measurement object of the measurement apparatus and measurement method of the present invention. It is.

  EXAMPLES Hereinafter, although this invention is demonstrated concretely based on an Example, this invention is not limited to these Examples.

  The following three types of DPFs (Samples 1 to 3) were prepared as DPFs for measuring the solid component collection efficiency.

(Sample 1)
Sample 1 is a cylindrical DPF whose honeycomb structure is made of cordierite, has a diameter of 304.8 mm, and a length of 304.8 mm. The cell density is 31 cells / cm ² , the partition wall thickness is 317.5 μm, the cell shape (the cross-sectional shape of the cell in the section perpendicular to the cell length direction) is square, the partition wall porosity is 59%, and the partition wall average The pore diameter is 14 μm. At one end portion of each cell, a plugging portion made of the same material as that of the honeycomb structure portion is disposed. The plugging portion is disposed so that one end surface (inflow end surface) and the other end surface (outflow end surface) of the DPF have a complementary checkered pattern.

(Sample 2)
Sample 2 is a columnar DPF whose honeycomb structure is made of cordierite, has a diameter of 304.8 mm, and a length of 304.8 mm. The cell density is 31 cells / cm ² , the partition wall thickness is 317.5 μm, the cell shape (cell cross-sectional shape in the cross section perpendicular to the cell length direction) is square, the partition wall porosity is 50%, and the partition wall average The pore diameter is 14 μm. At one end portion of each cell, a plugging portion made of the same material as that of the honeycomb structure portion is disposed. The plugging portion is disposed so that one end surface (inflow end surface) and the other end surface (outflow end surface) of the DPF have a complementary checkered pattern.

(Sample 3)
Sample 3 is a columnar DPF whose honeycomb structure is made of cordierite, has a diameter of 304.8 mm, and a length of 304.8 mm. The cell density is 31 cells / cm ² , the partition wall thickness is 228.6 μm, the cell shape (the cell cross-sectional shape in the cross section perpendicular to the cell length direction) is square, the partition wall porosity is 48%, and the partition wall average The pore diameter is 14 μm. At one end portion of each cell, a plugging portion made of the same material as that of the honeycomb structure portion is disposed. The plugging portion is disposed so that one end surface (inflow end surface) and the other end surface (outflow end surface) of the DPF have a complementary checkered pattern.

  About each DPF of the said samples 1-3, the collection efficiency of the solid component was measured with the measuring method of this invention shown below and the conventional measuring method. The results are shown in Table 1. In addition, from the measurement results, a graph showing the relationship between the DPF solid component collection efficiency obtained by the measurement method of the present invention and the DPF solid component collection efficiency obtained by the conventional measurement method was prepared. . The graph is shown in FIG.

(Measurement method of the present invention)
Using the measuring device of the present invention shown in FIG. 1, the simulated solid component was collected by the DPF by drawing the air containing the simulated solid component into the DPF for 2 hours and simultaneously withdrawing the air from the DPF. . A compressor was used for the air supply device, and an inverter type blower was used for the exhaust device. A simulated solid component supply apparatus having the structure shown in FIG. 2 was used. As the simulated solid component, carbon black having an average particle diameter of 14 nm simulating PM discharged from a diesel engine was used. The simulation solid component was supplied seven times per second by the simulation solid component supply device into the air fed from the air supply device to the DPF. The supply amount of the simulated solid component per supply was 0.9 mg. The flow rate of air sent from the air supply device to the DPF and the flow rate of air drawn from the DPF by the exhaust device were both 15 Nm ³ / min. In this way, after the simulated solid component was collected by the DPF, the collection efficiency of the solid component was determined by the above formula (1).

(Conventional measurement method)
A 200 ° C. exhaust gas containing PM was generated by a burner using light oil as fuel. This exhaust gas was supplied to the DPF at a flow rate of 15 Nm ³ / min for 2 hours, and PM was collected by the DPF. Thus, after PM was collected by the DPF, the solid component (PM) collection efficiency was determined. The collection efficiency is determined by measuring the mass of PM in the exhaust gas at the front side (upstream side in the gas flow direction) and the rear side (downstream side in the gas flow direction) of the DPF with a smoke meter. Calculated by
Collection efficiency (%) = (mass of PM in exhaust gas in front of DPF−mass of PM in exhaust gas behind DPF) / mass of PM in exhaust gas in front of DPF × 100 (2)

(result)
As shown in Table 1 and FIG. 5, the collection efficiency of the solid component of DPF measured by the measurement method of the present invention is substantially equal to the collection efficiency of the solid component of DPF measured by the conventional measurement method. The value of was shown. That is, it was found that there is a high correlation between the measurement results of both. In other words, the measurement method of the present invention (measurement method using the measurement apparatus of the present invention) can perform measurement more quickly and easily than the conventional measurement method, but with the same measurement accuracy as the conventional measurement method, the DPF. It was confirmed that the collection efficiency of the solid component can be measured.

  The present invention can be suitably used as a measuring device and a measuring method for measuring the collection efficiency of the solid component of DPF.

1: Diesel particulate filter (DPF), 2: Air supply device, 3: Exhaust device, 4: Simulated solid component supply device, 5: Simulated solid component, 10: Measuring device, 11: Container, 12: Impeller, 13: blade, 14: space, 15: hole, 16: piping, 17: holder, 20: honeycomb structure, 21: plugging portion, 22: partition wall, 23: cell, 23a: outlet plugging cell, 23b : Inlet plugged cell, 24: inflow end face, 25: outflow end face, G: exhaust gas.

Claims (8)

An air supply device for sending air to the diesel particulate filter;
An exhaust device that draws air sent from the air supply device to the diesel particulate filter from the diesel particulate filter and discharges it to the outside;
Simulation of intermittently supplying particulate simulated solid components simulating solid components contained in exhaust gas discharged from a diesel engine into the air sent from the air supply device to the diesel particulate filter at a constant cycle A solid component supply device (except for those equipped with an engine or burner device) ,
A measuring device for measuring the solid component collection efficiency of a diesel particulate filter.   The measuring apparatus according to claim 1, wherein the simulated solid component is one or more kinds of particles selected from the group consisting of carbon black that simulates particulate matter and incombustible particles that simulate ash.   The measuring apparatus according to claim 2, wherein the nonflammable particles are quicklime particles.   The measurement apparatus according to claim 1, wherein the air supply device is a dry air supply device.   The measuring apparatus according to claim 1, wherein the exhaust device is an inverter type blower.   The simulated solid component supply device has a storage container in which a hole is provided in a bottom portion that stores the simulated solid component, and an impeller that is disposed below the storage container and is rotatable in a certain direction, The measuring device according to claim 1, which is disposed above the air supply device. The impeller has a rotational axis perpendicular to the vertical direction, and the impeller has a V-shaped space formed between adjacent blades when viewed from the side surface direction. Item 7. The measuring device according to Item 6. The measurement apparatus according to any one of claims 1 to 7 , wherein air containing the simulated solid component is fed into the diesel particulate filter over a certain period of time, and at the same time, the air is supplied to the diesel particulates. By pulling out from the filter, the diesel particulate filter collects the simulated solid component, and the simulated solid component supply device supplies the diesel particulate filter with the air supplied from the air supply device to the diesel particulate filter. From the mass of the simulated solid component and the mass of the simulated solid component collected in the diesel particulate filter, the solid component capture efficiency of the diesel particulate filter is measured. Measuring method of collection efficiency.

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