CN115824929A

CN115824929A - DPF particle trapping efficiency detection device

Info

Publication number: CN115824929A
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: 2023-03-21
Anticipated expiration: 2043-01-06
Also published as: CN115824929B

Abstract

The invention belongs to the technical field of DPF detection, and discloses a DPF particle trapping efficiency detection device. This DPF granule entrapment efficiency detection device can detect and wait to detect the entrapment efficiency of DPF to the particulate matter of different particle sizes and different concentration, can also detect and wait to detect the whole entrapment efficiency of waiting to detect the mixture of DPF to the particulate matter that has different particle sizes in the real engine exhaust.

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

Diesel engines produce a large amount of particulate matter during operation, which needs to be removed as much as possible in order to protect the environment. DPF (Diesel particulate Filter) is one of the most effective and direct methods for purifying these particulate matter. The DPF is installed in the diesel vehicle exhaust system, and the DPF has wall flow formula structure, and the engine exhaust air current that contains particulate matter passes through DPF's inlet channel, flows into DPF's porous wall, flows out by DPF's outlet channel again, and at this in-process, most particulate matter in the air current is stopped above by DPF's porous wall entrapment to the purification of particulate matter in the engine exhaust has been realized. The efficiency of DPF in trapping particulate matter in the exhaust gas of a diesel engine is an important parameter for measuring the capacity of the DPF. Research has shown that the efficiency of trapping particulate matter in a DPF can be affected by the particle size of the particulate matter, i.e., the size of the particulate matter, and the concentration of the particulate matter, i.e., the amount or weight of the particulate matter in a volume of gas. However, there is no device in the prior art which can detect the trapping efficiency of the DPF for particulate matters with different particle sizes and can also detect the trapping efficiency of the DPF for a mixture consisting of particulate matters with different particle sizes in engine exhaust.

Disclosure of Invention

The invention aims to provide a DPF (diesel particulate filter) particle collection efficiency detection device, which solves the problem that no device capable of detecting the collection efficiency of a DPF on particles with different particle sizes and detecting the collection efficiency of the DPF on a mixture consisting of the particles with different particle sizes in engine exhaust exists in the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme:

the DPF particle trapping 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 gas outlet end of the DPF to be detected;

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

an engine exhaust generation system capable of outputting engine exhaust;

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

As a preferable scheme of the above DPF particle trapping efficiency detection apparatus, the monodisperse particle generation system includes a particle generator, a monodisperse particle screening structure, a fan, and a first connection pipe, an output end of the particle generator 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 connection pipe, an output end of the fan is communicated with one end of the first connection pipe, and another end of the first connection pipe is communicable with an input end of the DPF to be detected through the valve structure.

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

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

As a preferable mode of the DPF particulate collection 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 connection pipe.

As a preferable scheme of the DPF particulate trapping efficiency detection apparatus, the engine exhaust generation system includes an engine and a second connection pipe, one end of the second connection pipe is communicated with an output end of the engine, and the other end of the second connection pipe is capable of being communicated with an input end of the to-be-detected DPF through the valve structure.

In a preferable aspect of the DPF particulate collection efficiency detection apparatus, the valve structure includes a first on-off valve provided in the first connection pipe and a second on-off valve provided in the second connection pipe.

As a preferable mode of the DPF particulate trapping efficiency detecting apparatus, the valve structure includes a three-way valve having a first port, a second port, and a third port, the first port is communicated with the first connecting pipe, the second port is communicated with the second connecting pipe, the third port is communicated with an input end of the DPF to be detected, and the three-way valve can communicate the first port with the third port or communicate the second port with the third port.

As a preferable scheme of the DPF particulate collection efficiency detection apparatus, the DPF particulate collection efficiency detection apparatus further includes a dust removal structure, and the dust removal structure is communicated with an output end of the DPF to be detected.

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

The invention has the beneficial effects that:

the invention provides a DPF (diesel particulate filter) particle trapping efficiency detection device, which conveys particles into a DPF to be detected through a monodisperse particle generation system or an engine exhaust generation system, a first particle size analyzer measures the particle size of the particles at the input end of the DPF to be detected and the particle concentration of each particle size, a second particle size analyzer measures the particle size of the particles at the output end of the DPF to be detected and the particle concentration of each particle size, and the trapping efficiency of the DPF to be detected on the particles of each particle size can be obtained through the first particle size analyzer and the second particle size analyzer. When the valve structure is communicated with the air inlet end of the DPF to be detected, the monodisperse particle generation system outputs monodisperse particles with different particle sizes and different particle concentrations, the monodisperse particles are a group of particles with small dispersion degree, and are basically concentrated on a plurality of particles near a certain average particle size value, and the DPF particle trapping efficiency detection device can detect the trapping efficiency of the DPF to be detected on the particulates with different particle sizes and different concentrations. When the valve structure is communicated with the engine tail gas generation system and the air inlet end of the DPF to be detected, the engine tail gas generation system outputs the engine tail gas, the tail gas truly discharged by the engine can be introduced into the DPF to be detected, and at the moment, the DPF particle trapping efficiency detection device can detect the overall trapping efficiency of the DPF to be detected on a mixture of particles with different particle sizes in the real engine tail gas.

Drawings

Fig. 1 is a schematic structural view of a DPF particulate trapping efficiency detection apparatus 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 particulate electromigration device; 44. a first connecting pipe; 45. a filter; 46. an air flow control valve;

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

61. a first on-off valve; 62. a second on-off valve;

7. dust removal structure.

Detailed Description

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

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation that the first and second features are not in direct contact, but are in contact via another feature between them. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The invention provides a DPF (diesel particulate filter) particle collection 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 tail 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 tail gas generation system 5 can output engine tail 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 tail 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 both measuring devices for measuring the concentration and the particle size of particles in the gas, and can rapidly obtain the respective concentrations of the particles with different particle sizes in the measured gas. The DPF trapping efficiency =100% (particulate matter concentration at DPF input-particulate matter concentration at DPF output)/particulate matter concentration at DPF input.

This DPF granule entrapment efficiency detection device, through monodisperse granule generating system 4 or engine exhaust generating system 5 to waiting to detect the DPF1 in transport particulate matter, the particle diameter of the particulate matter of the input of waiting to detect DPF1 and the particulate matter concentration of each particle diameter are detected in the measurement of first particle diameter analysis appearance 2, the particle diameter of the particulate matter of the output of waiting to detect DPF1 and the particulate matter concentration of each particle diameter are detected in the measurement of second particle diameter analysis appearance 3, can obtain the entrapment efficiency of the particulate matter of detecting DPF to each particle diameter through first particle diameter analysis appearance 2 and second particle diameter analysis appearance 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, the monodisperse particles are a group of particles with small dispersion degree, and are basically concentrated on a plurality of particles near a certain average particle size, and at the moment, the DPF particle trapping efficiency detection 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 tail gas generation system 5 with the air inlet end of the DPF1 to be detected, the engine tail gas generation system 5 outputs the engine tail gas, the tail gas truly discharged by the engine 51 can be introduced into the DPF1 to be detected, and at the moment, the DPF particle trapping efficiency detection device can detect the overall trapping efficiency of the DPF1 to be detected on the mixture of particles with different particle sizes in the real engine tail 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, 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 sizes from the particles generated by the particle generator 41, and air output by the fan can bring the screened monodisperse particles to enter the DPF1 to be detected through the valve structure.

Optionally, the monodisperse particle sorting structure includes a first differential particle electromigration device 42 and a second differential particle electromigration device 43, an output terminal of the particle generator 41 is communicated with an input terminal of the first differential particle electromigration device 42, an output terminal of the first differential particle electromigration device 42 is communicated with an input terminal of the second differential particle electromigration device 43, and an output terminal of the second differential particle electromigration device 43 is communicated with the first connection pipe 44. A Differential Mobility Analyzer (DMA) is used to identify and screen particles of different sizes by first charging the particles and then causing the particles to migrate in an electric field. Research shows that when two DMAs are connected in series, the monodisperse particles with different average particle sizes can be accurately screened by adjusting relevant parameters. Therefore, the first differential particle electromigration device 42 and the second differential particle electromigration device 43 are connected in series, so that monodisperse particles with a desired particle size can be accurately screened out.

Optionally, the monodisperse particle generation system 4 further comprises an air flow control valve 46, the air flow control valve 46 being arranged in the first connection tube 44. The air flow control valve 46 can control the flow rate of air merged with the monodisperse particles output from the monodisperse particle generation system 4, and thus, can control the particle concentration in the air introduced into the DPF1 to be tested. It will be appreciated that the air flow control valve 46 is positioned before the connection of the monodisperse particle screening arrangement with the first connection tube 44, the more air flow the air flow control valve 46 controls through, the lower the concentration of particles in the air passing into the DPF1 to be tested.

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

Optionally, the engine exhaust generating system 5 includes an engine 51 and a second connecting pipe 52, one end of the second connecting pipe 52 is communicated with the output end of the engine 51, and the other end can be communicated with the input end of the DPF1 to be detected through a valve structure. The exhaust gas from the engine 51 can enter the DPF1 to be tested through the valve structure via 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 generation system 4 is communicated with the air inlet end of the DPF1 to be detected, and the DPF particle trapping efficiency detection 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 switch valve 61 is closed and the second switch valve 62 is opened, the engine exhaust generation system 5 is communicated with the air inlet end of the DPF1 to be detected, and at this time, the DPF particulate trapping efficiency detection device can detect the overall trapping efficiency of the DPF1 to be detected on a mixture of particulate matters with different particle sizes in real engine exhaust.

As an alternative, the valve structure includes a three-way valve having a first port, a second port, and a third port, the first port being communicated with the first connection pipe 44, the second port being communicated with the second connection pipe 52, the third port being communicated with the input end of the DPF1 to be tested, the three-way valve being capable of communicating the first port with the third port or communicating the second port with the third port. When the first interface of the three-way valve is communicated with the third interface, 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 particulate trapping efficiency detecting apparatus 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 removing structure 7 can purify the gas output by the DPF1 to be detected, and prevent the gas with particulate matters in the detection process from being discharged into the air to pollute the environment.

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

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations, and substitutions will occur to those skilled in the art without departing from the scope of the present invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

A DPF particle collection efficiency detection device, comprising:

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

the second particle size analyzer (3), the second particle size analyzer (3) is arranged at the air outlet end of the DPF (1) to be detected;

a monodisperse particle generation system (4), wherein the monodisperse particle generation system (4) can output monodisperse particles with different particle sizes and different particle concentrations;

the engine tail gas generating system (5), the engine tail gas generating system (5) can output engine tail gas;

the valve structure can communicate the monodisperse particle generation system (4) with the air inlet end of the DPF (1) to be detected, or communicate the engine tail gas generation system (5) with the air inlet end of the DPF (1) to be detected.
2. The DPF particulate trapping efficiency detecting apparatus according to claim 1, wherein the monodisperse particulate generation system (4) includes a particulate generator (41), a monodisperse particulate screening structure, a fan, and a first connecting pipe (44), an output end of the particulate generator (41) communicates with an input end of the monodisperse particulate screening structure, an output end of the monodisperse particulate screening structure communicates with the first connecting pipe (44), an output end of the fan communicates with one end of the first connecting pipe (44), and the other end of the first connecting pipe (44) is communicable with an input end of the DPF (1) to be detected through the valve structure.
3. The DPF particulate trapping efficiency detecting apparatus as claimed in claim 2, wherein the monodisperse particulate screening structure includes a first differential particulate electromigration device (42) and a second differential particulate electromigration device (43), an output terminal of the particulate generator (41) is communicated with an input terminal of the first differential particulate electromigration device (42), an output terminal of the first differential particulate electromigration device (42) is communicated with an input terminal of the second differential particulate electromigration device (43), and an output terminal of the second differential particulate electromigration device (43) is communicated with the first connecting pipe (44).
4. The DPF particulate trapping efficiency detecting 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 connection pipe (44).
5. The DPF particulate trapping efficiency detection apparatus according to claim 2, wherein the monodisperse particulate generation system (4) further includes a filter (45), both ends of the filter (45) being communicated with the fan and the first connection pipe (44), respectively.
6. The DPF particulate trapping efficiency detecting apparatus according to claim 2, wherein the engine exhaust gas generating system (5) includes an engine (51) and a second connecting pipe (52), one end of the second connecting pipe (52) is communicated with an output end of the engine (51), and the other end is communicable with an input end of the DPF (1) to be tested through the valve structure.
7. The DPF particulate trapping efficiency detecting apparatus according to claim 6, wherein the valve structure includes a first on-off valve (61) and a second on-off valve (62), the first on-off valve (61) being provided to the first connection pipe (44), the second on-off valve (62) being provided to the second connection pipe (52).
8. The DPF particulate trapping efficiency detecting apparatus according to claim 6, wherein the valve structure includes a three-way valve having a first port communicating with the first connection pipe (44), a second port communicating with the second connection pipe (52), and a third port communicating with an input end of the DPF (1) to be tested, the three-way valve being capable of communicating the first port with the third port or the second port with the third port.
9. The DPF particulate trapping efficiency detecting apparatus according to claim 1, further comprising a dust removing structure (7), wherein the dust removing structure (7) communicates with an output end of the DPF (1) to be detected.
10. The DPF particulate trapping efficiency detecting apparatus according to claim 1, further comprising a sealing structure having a sealing cavity in which the DPF (1) to be detected, the monodisperse particulate generation system (4), the engine exhaust gas generation system (5) and the valve structure are located.