CN115824929B

CN115824929B - DPF particle trapping efficiency detection device

Info

Publication number: CN115824929B
Application number: CN202310016917.XA
Authority: CN
Inventors: 翟天宇; 李志杰; 李翔; 张瑜; 满恒孝; 张汝晓; 王建东; 白书战
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2023-01-06
Filing date: 2023-01-06
Publication date: 2023-05-23
Anticipated expiration: 2043-01-06
Also published as: CN115824929A

Abstract

The invention belongs to the technical field of DPF detection, and discloses a DPF particle trapping efficiency detection device. The DPF particle trapping efficiency detection device can detect the trapping efficiency of the DPF to be detected on the particles with different particle sizes and different concentrations, and can also detect the overall trapping efficiency of the DPF to be detected on the mixture of the particles with different particle sizes in the tail gas of the real engine.

Description

DPF particle trapping efficiency detection device

Technical Field

The invention relates to the technical field of DPF detection, in particular to a DPF particle trapping efficiency detection device.

Background

During operation of a diesel engine, a large amount of particulate matter is generated, and it is necessary to remove the particulate matter as much as possible in order to protect the environment. DPF (Diesel Particle Filter, diesel particulate filter) is one of the most efficient and straightforward methods of purifying these particulates. The DPF is arranged in an exhaust system of the diesel vehicle, the DPF is provided with a wall flow type structure, engine exhaust gas flow containing particles flows into a porous wall surface of the DPF through an inlet channel of the DPF and flows out of an outlet channel of the DPF, and most of the particles in the flow are trapped by the porous wall surface of the DPF and stay on the porous wall surface of the DPF in the process, so that the purification of the particles in the engine exhaust gas is realized. The efficiency of a DPF to trap particulate matter in the exhaust of a diesel engine is an important parameter in measuring the capability of the DPF. Research shows that the trapping efficiency of the DPF on the particulate matters is affected by the particle size and concentration of the particulate matters, wherein the particle size of the particulate matters is the size of the particulate matters, and the concentration of the particulate matters is the quantity or weight of the particulate matters in a certain volume of gas. However, there is no device in the prior art that can detect the trapping efficiency of the DPF for the particulate matters with different particle sizes and the trapping efficiency of the DPF for the mixture of the particulate matters with different particle sizes in the engine exhaust.

Disclosure of Invention

The invention aims to provide a DPF particle trapping efficiency detection device, which solves the problem that a device for detecting the trapping efficiency of DPF on particles with different particle sizes and detecting the trapping efficiency of DPF on a mixture of the particles with different particle sizes in engine tail gas is not available in the prior art.

To achieve the purpose, the invention adopts the following technical scheme:

DPF particulate matter entrapment efficiency detection device includes:

the first particle size analyzer is arranged at the air inlet end of the DPF to be detected;

the second particle size analyzer is arranged at the air outlet end of the DPF to be detected;

a monodisperse particle generating system capable of outputting monodisperse particles of different particle sizes and different particle concentrations;

the engine exhaust gas generating system can output engine exhaust gas;

and the valve structure can be used for communicating the monodisperse particle generation system with the air inlet end of the DPF to be detected or communicating the engine tail gas generation system with the air inlet end of the DPF to be detected.

As a preferred scheme of the DPF particle trapping efficiency detection device, the monodisperse particle generation system comprises a particle generator, a monodisperse particle screening structure, a fan and a first connecting pipe, wherein the output end of the particle generator is communicated with the input end of the monodisperse particle screening structure, the output end of the monodisperse particle screening structure is communicated with the first connecting pipe, the output end of the fan is communicated with one end of the first connecting pipe, and the other end of the first connecting pipe is communicated with the input end of the DPF to be detected through the valve structure.

As a preferable mode of the DPF particle trapping efficiency detecting device, the monodisperse particle screening structure includes a first differential particle electromigration device and a second differential particle electromigration device, an output end of the particle generator is communicated with an input end of the first differential particle electromigration device, an output end of the first differential particle electromigration device is communicated with an input end of the second differential particle electromigration device, and an output end of the second differential particle electromigration device is communicated with the first connecting pipe.

As a preferable mode of the DPF particulate trap efficiency detection device, the monodisperse particulate generation system further includes an air flow control valve provided in the first connecting pipe.

As a preferable mode of the DPF particulate trap efficiency detection device, the monodisperse particulate generation system further includes a filter, and both ends of the filter are respectively communicated with the fan and the first connecting pipe.

As a preferable mode of the DPF particulate trap efficiency detecting device, the engine exhaust gas generating system includes an engine and a second connecting pipe, one end of the second connecting pipe is communicated with an output end of the engine, and the other end of the second connecting pipe is communicated with an input end of the DPF to be detected through the valve structure.

As a preferable mode of the DPF particulate trap efficiency detection device, the valve structure includes a first switching valve and a second switching valve, the first switching valve is disposed in the first connection pipe, and the second switching valve is disposed in the second connection pipe.

As a preferred scheme of the DPF particle trapping efficiency detection device, the valve structure comprises a three-way valve, wherein the three-way valve is provided with a first interface, a second interface and a third interface, the first interface is communicated with the first connecting pipe, the second interface is communicated with the second connecting pipe, the third interface is communicated with the input end of the DPF to be detected, and the three-way valve can be used for communicating the first interface with the third interface or communicating the second interface with the third interface.

As a preferable scheme of the above DPF particle trapping efficiency detecting device, the DPF particle trapping efficiency detecting device further includes a dust removing structure, and the dust removing structure is communicated with an output end of the DPF to be detected.

As a preferable scheme of the above DPF particle trapping efficiency detecting device, the DPF particle trapping efficiency detecting device further includes a sealing structure having a sealing cavity, and the DPF to be detected, the monodisperse particle generating system, the engine exhaust gas generating system, and the valve structure are all located in the sealing cavity.

The invention has the beneficial effects that:

the invention provides a DPF particle trapping efficiency detection device, which is used for conveying particles into a DPF to be detected through a monodisperse particle generation system or an engine exhaust gas generation system, wherein a first particle size analyzer is used for measuring the particle size of the particles at the input end of the DPF to be detected and the particle concentration of the particles with each particle size, a second particle size analyzer is used for measuring the particle size of the particles at the output end of the DPF to be detected and the particle concentration of the particles with each particle size, and the trapping efficiency of the DPF to be detected on the particles with each particle size can be obtained through the first particle size analyzer and the second particle size analyzer. When the valve structure communicates the monodisperse particle generating system with the air inlet end of the DPF to be detected, the monodisperse particle generating system outputs monodisperse particles with different particle sizes and different particle concentrations, wherein the monodisperse particles are a group of particles with small particle size discrete degree and are basically concentrated near a certain particle size average value, and at the moment, the DPF particle trapping efficiency detecting device can detect the trapping efficiency of the DPF to be detected on the particles with different particle sizes and different concentrations. When the valve structure is used for communicating the engine exhaust gas generating system with the air inlet end of the DPF to be detected, the engine exhaust gas generating system outputs engine exhaust gas, the exhaust gas truly discharged by the engine can be introduced into the DPF to be detected, and at the moment, the DPF particle trapping efficiency detecting device can detect the overall trapping efficiency of the DPF to be detected on the mixture of the particles with different particle sizes in the real engine exhaust gas.

Drawings

Fig. 1 is a schematic structural diagram of a DPF particulate trap efficiency detection device according to an embodiment of the present invention.

In the figure:

1.DPF to be detected;

2. a first particle size analyzer;

3. a second particle size analyzer;

4. a monodisperse particle generation system; 41. a particle generator; 42. a first differential particle electromigration device; 43. a second differential particle electromigration device; 44. a first connection pipe; 45. a filter; 46. an air flow control valve;

5. an engine exhaust gas generation system; 51. an engine; 52. a second connection pipe;

61. a first switching valve; 62. a second switching valve;

7. dust removal structure.

Detailed Description

The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.

In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", and the like are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

The invention provides a DPF particle trapping efficiency detection device, which comprises a first particle size analyzer 2, a second particle size analyzer 3, a monodisperse particle generation system 4, an engine exhaust gas generation system 5 and a valve structure, wherein the first particle size analyzer 2 is arranged at the air inlet end of a DPF1 to be detected, the second particle size analyzer 3 is arranged at the air outlet end of the DPF1 to be detected, the monodisperse particle generation system 4 can output monodisperse particles with different particle sizes and different particle concentrations, the engine exhaust gas generation system 5 can output engine exhaust gas, and the valve structure can communicate the monodisperse particle generation system 4 with the air inlet end of the DPF1 to be detected or communicate the engine exhaust gas generation system 5 with the air inlet end of the DPF1 to be detected.

The first particle size analyzer 2 and the second particle size analyzer 3 are measuring devices for measuring the concentration and the particle size of the particulate matters in the gas, and can quickly obtain the respective concentrations of the particulate matters with different particle sizes in the measured gas. The trapping efficiency of DPF on particulate matter=100% (particulate matter concentration at DPF input end-particulate matter concentration at DPF output end)/particulate matter concentration at DPF input end.

The DPF particle trapping efficiency detecting device is configured to convey particulate matters to the DPF1 to be detected by the monodisperse particle generation system 4 or the engine exhaust gas generation system 5, the first particle size analyzer 2 measures the particle size of the particulate matters at the input end of the DPF1 to be detected and the particle concentration of the particulate matters at each particle size, the second particle size analyzer 3 measures the particle size of the particulate matters at the output end of the DPF1 to be detected and the particle concentration of the particulate matters at each particle size, and the trapping efficiency of the detected DPF to the particulate matters at each particle size can be obtained by the first particle size analyzer 2 and the second particle size analyzer 3. When the valve structure communicates the monodisperse particle generating system 4 with the air inlet end of the DPF1 to be detected, the monodisperse particle generating system 4 outputs monodisperse particles with different particle sizes and different particle concentrations, wherein the monodisperse particles are a group of particles with small particle sizes, which are basically concentrated near a certain particle size average value, and at the moment, the DPF particle trapping efficiency detecting device can detect the trapping efficiency of the DPF1 to be detected on the particulate matters with different particle sizes and different concentrations. When the valve structure communicates the engine exhaust gas generating system 5 with the air inlet end of the DPF1 to be detected, the engine exhaust gas generating system 5 outputs engine exhaust gas, and exhaust gas actually discharged by the engine 51 can be introduced into the DPF1 to be detected, and at this time, the DPF particle trapping efficiency detecting device can detect the overall trapping efficiency of the DPF1 to be detected on the mixture of the particulate matters with different particle sizes in the real engine exhaust gas.

Optionally, the monodisperse particle generating system 4 includes a particle generator 41, a monodisperse particle screening structure, a fan and a first connecting pipe 44, wherein an output end of the particle generator 41 is communicated with an input end of the monodisperse particle screening structure, an output end of the monodisperse particle screening structure is communicated with the first connecting pipe 44, an output end of the fan is communicated with one end of the first connecting pipe 44, and the other end of the first connecting pipe 44 can be communicated with an input end of the DPF1 to be detected through a valve structure. The particle generator 41 can continuously generate particles, the monodisperse particle screening structure can screen monodisperse particles with required particle size from the particles generated by the particle generator 41, and air output by the fan can enter the DPF1 to be detected through the valve structure with the screened monodisperse particles.

Optionally, the monodisperse particle screening structure comprises a first differential particle electromigration 42 and a second differential particle electromigration 43, an output of the particle generator 41 is in communication with an input of the first differential particle electromigration 42, an output of the first differential particle electromigration 42 is in communication with an input of the second differential particle electromigration 43, and an output of the second differential particle electromigration 43 is in communication with the first connecting pipe 44. And the differential particle electromigration device (Differential Mobility Analyzer, DMA) realizes the identification and screening of the particles with different particle diameters by firstly electrifying the particles and then enabling the particles to migrate in an electric field. Research shows that when two DMAs are connected in series, the accurate screening of the monodisperse particles with different average particle diameters can be realized by adjusting related parameters. Therefore, monodisperse particles having a desired particle diameter can be precisely selected by connecting the first differential particle electromigration 42 and the second differential particle electromigration 43 in series.

Optionally, the monodisperse particle generating system 4 further comprises an air flow control valve 46, the air flow control valve 46 being provided at the first connecting tube 44. The air flow control valve 46 can control the flow rate of air merging with the monodisperse particles outputted from the monodisperse particle generating system 4, and thus can control the concentration of particles in the air flowing into the DPF1 to be detected. It will be appreciated that the more the air flow control valve 46 is disposed in front of the connection of the monodisperse particle screening arrangement to the first connection tube 44, the less the air flow control valve 46 controls the air flow therethrough, the less the concentration of particles in the air that is passed into the DPF1 to be tested.

Optionally, the monodisperse particle generating system 4 further comprises a filter 45, both ends of the filter 45 being in communication with the fan and the first connecting tube 44, respectively. The filter 45 can filter impurities in the air output from the blower to prevent the air from being doped with impurities other than the monodisperse particles.

Alternatively, the engine exhaust gas generating system 5 includes an engine 51 and a second connection pipe 52, one end of the second connection pipe 52 is communicated with the output end of the engine 51, and the other end is communicated with the input end of the DPF1 to be detected through a valve structure. The exhaust gas outputted from the engine 51 can enter the DPF1 to be detected through the valve structure through the second connection pipe 52.

Alternatively, the valve structure includes a first switching valve 61 and a second switching valve 62, the first switching valve 61 is disposed at the first connection pipe 44, and the second switching valve 62 is disposed at the second connection pipe 52. When the first switch valve 61 is opened and the second switch valve 62 is closed, the monodisperse particle generating system 4 is communicated with the air inlet end of the DPF1 to be detected, and the DPF particle trapping efficiency detecting device can detect the trapping efficiency of the DPF1 to be detected on the particles with different particle sizes and different concentrations; when the first on-off valve 61 is closed and the second on-off valve 62 is opened, the engine exhaust gas generating system 5 communicates with the intake end of the DPF1 to be detected, and at this time, the DPF particulate trapping efficiency detecting device can detect the overall trapping efficiency of the DPF1 to be detected for the mixture of particulate matters having different particle diameters in the real engine exhaust gas.

As an alternative, the valve structure comprises a three-way valve having a first interface communicating with the first connecting pipe 44, a second interface communicating with the second connecting pipe 52, and a third interface communicating with the input of the DPF1 to be detected, the three-way valve being capable of communicating the first interface with the third interface or the second interface with the third interface. When the first interface and the third interface of the three-way valve are communicated, the monodisperse particle generation system 4 is communicated with the air inlet end of the DPF1 to be detected; when the second interface of the three-way valve is communicated with the third interface, the engine tail gas generation system 5 is communicated with the air inlet end of the DPF1 to be detected.

Optionally, the DPF particle trapping efficiency detecting device further includes a dust removing structure 7, and the dust removing structure 7 is communicated with an output end of the DPF1 to be detected. The dust removal structure 7 can purify the gas output by the DPF1 to be detected, and prevent the gas with the particulate matters from being discharged into the air in the detection process, thereby polluting the environment.

Optionally, the DPF particle trapping efficiency detecting device further includes a sealing structure having a sealing cavity, and the DPF1 to be detected, the monodisperse particle generating system 4, the engine exhaust generating system 5 and the valve structure are all located in the sealing cavity. The sealing structure can keep the temperature of the DPF particle trapping efficiency detection device, and can prevent the DPF particle trapping efficiency detection device from generating air leakage.

It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the invention. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims

DPF particle trapping efficiency detection device, characterized by comprising:

the particle size analyzer comprises a first particle size analyzer (2), wherein the first particle size analyzer (2) is arranged at the air inlet end of a DPF (1) to be detected;

the second particle size analyzer (3), the second particle size analyzer (3) is set up in the end of giving vent to anger of the said DPF (1) to be detected; the first particle size analyzer (2) and the second particle size analyzer (3) are measuring devices for measuring the concentration and the particle size of the particles in the gas, and can measure the concentration of the particles with different particle sizes in the gas;

a monodisperse particle generating system (4), the monodisperse particle generating system (4) being capable of outputting monodisperse particles of different particle sizes and different particle concentrations;

an engine exhaust gas generation system (5), the engine exhaust gas generation system (5) being capable of outputting engine exhaust gas;

the valve structure can be used for communicating the monodisperse particle generation system (4) with the air inlet end of the DPF (1) to be detected or communicating the engine tail gas generation system (5) with the air inlet end of the DPF (1) to be detected.
2. The DPF particle trapping efficiency detecting device according to claim 1, wherein the monodisperse particle generating system (4) includes a particle generator (41), a monodisperse particle screening structure, a fan, and a first connecting pipe (44), an output end of the particle generator (41) is in communication with an input end of the monodisperse particle screening structure, an output end of the monodisperse particle screening structure is in communication with the first connecting pipe (44), an output end of the fan is in communication with one end of the first connecting pipe (44), and the other end of the first connecting pipe (44) is capable of being in communication with an input end of the DPF (1) to be detected through the valve structure.
3. The DPF particle trapping efficiency detecting device according to claim 2, wherein the monodisperse particle screening structure includes a first differential particle electromigration device (42) and a second differential particle electromigration device (43), an output of the particle generator (41) is in communication with an input of the first differential particle electromigration device (42), an output of the first differential particle electromigration device (42) is in communication with an input of the second differential particle electromigration device (43), and an output of the second differential particle electromigration device (43) is in communication with the first connecting pipe (44).
4. The DPF particulate trap efficiency detection apparatus according to claim 2, wherein the monodisperse particulate generation system (4) further includes an air flow control valve (46), the air flow control valve (46) being provided to the first connecting pipe (44).
5. The DPF particulate trap efficiency detection device according to claim 2, wherein the monodisperse particulate generation system (4) further includes a filter (45), both ends of the filter (45) being respectively in communication with the blower and the first connecting pipe (44).
6. The DPF particulate trap efficiency detection device according to claim 2, characterized in that the engine exhaust gas generation system (5) includes an engine (51) and a second connection pipe (52), one end of the second connection pipe (52) is in communication with an output end of the engine (51), and the other end is communicable with an input end of the DPF (1) to be detected through the valve structure.
7. The DPF particulate trap efficiency detection device according to claim 6, wherein the valve structure includes a first switching valve (61) and a second switching valve (62), the first switching valve (61) being provided to the first connection pipe (44), the second switching valve (62) being provided to the second connection pipe (52).
8. The DPF particulate trap efficiency detection device according to claim 6, characterized in that the valve structure includes a three-way valve having a first interface communicating with the first connecting pipe (44), a second interface communicating with the second connecting pipe (52), and a third interface communicating with an input end of the DPF (1) to be detected, the three-way valve being capable of communicating the first interface with the third interface or the second interface with the third interface.
9. The DPF particle trapping efficiency detecting device according to claim 1, further comprising a dust removing structure (7), the dust removing structure (7) being in communication with an output end of the DPF (1) to be detected.
10. The DPF particle trapping efficiency detecting device according to claim 1, further comprising a sealing structure having a sealing cavity, the DPF (1) to be detected, the monodisperse particle generating system (4), the engine exhaust gas generating system (5), and the valve structure being all located in the sealing cavity.