CN114577543A - System and method for detecting emission amount of particulate matters in tail gas - Google Patents

Abstract

The invention discloses a system and a method for detecting the emission of particulate matters in tail gas. The system comprises: the sampling device comprises a sampling main pipe, a first sampling branch pipe and a second sampling branch pipe, wherein the first sampling branch pipe and the second sampling branch pipe are connected with the sampling main pipe; the reference system comprises a particulate matter trapping device and a first reaction device which are sequentially connected, wherein the particulate matter trapping device is connected with the first sampling branch pipe and is used for trapping particulate matters in reference sample gas flowing through the reference system, and the first reaction device is used for treating and detecting other components except the particulate matters in the reference sample gas; and the measuring system comprises a second reaction device which is connected with the second sampling branch pipe and is used for processing and detecting the measuring sample gas flowing through the measuring system. The system provided by the embodiment of the invention has the advantages of simplicity in operation, real-time detection and the like.

Description

System and method for detecting particulate matter emissions in exhaust gas

technical field

The present invention generally relates to the technical field of particulate matter detection, and more particularly, to a system and method for detecting particulate matter emission in exhaust gas.

Background technique

Particulate matter (PM) is one of the main pollutants emitted by diesel engines. At present, the commonly used exhaust particulate matter detection method in my country's emission regulations is mainly the filter paper weighing method. The method uses equipment such as a dilution channel to collect the particulate matter emitted by an engine or vehicle operating under working conditions on a filter paper to a certain standard, and determines the amount of particulate matter emitted by the increase in the weight of the filter paper. The detection results of this method are accurate, but the cost of the dilution channel is very high (more than 1 million yuan), and the operation steps are numerous. For example, it includes: constant temperature and humidity treatment of filter paper before the experiment, stable and weighed; particle sampling with filter paper in the exhaust gas detection system;

This method has a long experimental period, which takes several days, and can only obtain the result of the total mass of particulate matter collected on the filter paper. It is not conducive to accurately analyze the causes of particulate pollution in order to formulate targeted solutions. Therefore, it is of great significance to develop a real-time, simple and fast device or method for detecting particulate emissions.

SUMMARY OF THE INVENTION

In order to at least solve the defects of the prior art described in the above background art, the technical solutions of the present invention provide, in various aspects, a system for detecting the emission of particulate matter in exhaust gas and a method for detecting the amount of particulate matter in exhaust gas by using the system .

In a first aspect of the present invention, there is provided a system for detecting the emission of particulate matter in exhaust gas, comprising: a sampling device, including a sampling manifold and a first sampling branch pipe and a second sampling branch pipe connected to the sampling manifold, wherein The sampling main pipe is connected with the exhaust gas discharge pipeline, and is used to absorb the exhaust gas in the exhaust gas discharge pipeline; the reference system includes a particulate matter trapping device and a first reaction device connected in sequence, wherein the particulate matter trapping device is connected with the exhaust gas. The first sampling branch pipe is connected, and is used for capturing the particulate matter in the reference sample gas flowing through the reference system, and the first reaction device is used for collecting other than the particulate matter in the reference sample gas. The components are processed and detected; and a measurement system includes a second reaction device, which is connected to the second sampling branch pipe and is used for processing and detection of the measurement sample gas flowing through the measurement system.

In one embodiment of the present invention, the first reaction device includes: a first filter coated with an oxidation catalyst; and a first constant temperature device disposed on the first filter for controlling the temperature of the first filter; the reference system further includes: a first temperature sensor, which is arranged inside the first filter and used to detect temperature changes in the first filter.

In another embodiment of the present invention, the second reaction device includes: a second filter coated with an oxidation catalyst; and a second constant temperature device disposed on the second filter for The temperature of the second filter is controlled; the measurement system further includes: a second temperature sensor arranged inside the second filter for detecting temperature changes in the second filter.

In yet another embodiment of the present invention, the particulate matter trapping device includes: a third filter, which is connected to the first sampling branch pipe and is used for filtering the reference sample gas to trap the the particulate matter in the reference sample gas; and a third constant temperature device arranged on the third filter for controlling the temperature of the third filter.

In an embodiment of the present invention, the reference system further includes: a Z-shaped reference pipeline, which is connected between the particulate matter trapping device and the first reaction device, and includes a Z-shaped reference pipeline a first upstream pipeline, a first midstream pipeline, and a first downstream pipeline connected in sequence, wherein the first upstream pipeline is connected to the particulate capture device, and the first upstream pipeline The first connection point with the first midstream pipeline is connected with the first reaction device; the measurement system further includes: a Z-shaped measurement pipeline, which is connected to the second sampling branch pipe and the first sampling pipe. Between the two reaction devices, it includes a second upstream pipeline, a second midstream pipeline and a second downstream pipeline connected in sequence along a zigzag shape, wherein the second upstream pipeline is connected to the second upstream pipeline. The sampling branch pipe is connected, and the second connection between the second upstream section pipeline and the second midstream section pipeline is connected with the second reaction device.

In another embodiment of the present invention, the first upstream section pipeline, the first midstream section pipeline and the first downstream section pipeline are arranged in parallel; and the second upstream section The pipeline, the pipeline of the second midstream section and the pipeline of the second downstream section are arranged in parallel.

In yet another embodiment of the present invention, the inner diameter of the zigzag reference pipeline is larger than the inner diameter of the first sampling branch pipe; and the inner diameter of the zigzag measuring pipeline is larger than the inner diameter of the second sampling branch pipe the inside diameter of.

In an embodiment of the present invention, the measurement system further includes: a first electrode, which is arranged in the second upstream pipeline; and a connecting pipe, which is connected between the second connection and the first between two reaction devices; the system further includes: a power supply, the first pole of which is connected to the connecting pipe, and the second pole of which is connected to the first electrode and the second upstream pipeline, wherein the first pole is connected to the connecting pipe. One pole is one of the positive and negative poles, and the second pole is the other of the positive and negative poles.

In another embodiment of the present invention, the measurement system further includes: a second electrode, which is arranged in the second midstream pipeline; and the second electrode of the power source is further connected with the second electrode The electrode is connected to the second midstream section pipeline.

In yet another embodiment of the present invention, the first electrode is a positive electrode, and the second electrode is a negative electrode.

In an embodiment of the present invention, the reference system further includes: a first flow controller, which is connected to the exhaust end of the pipeline of the first downstream section, for controlling the flow through the first downstream section the first gas flow rate of the pipeline; and a second flow controller, which is connected to the exhaust end of the first reaction device and used to control the second gas flow rate flowing through the first reaction device; the measurement system It also includes: a third flow controller, which is connected to the exhaust end of the second downstream section pipeline and used to control the flow of the third gas flowing through the second downstream section pipeline; and a fourth flow controller , which is connected to the exhaust end of the second reaction device, and is used to control the flow rate of the fourth gas flowing through the second reaction device.

In another embodiment of the present invention, the system further includes: a control unit, which communicates with the first flow controller, the second flow controller, the third flow controller and the fourth flow The controller is connected and used for: controlling the flow of the second gas to be smaller than the flow of the first gas; controlling the flow of the fourth gas to be smaller than the flow of the third gas; controlling the flow of the first gas to be equal to the flow of the third gas flow; and controlling the second gas flow to be equal to the fourth gas flow.

In yet another embodiment of the present invention, the system further comprises: a first air inlet pipe, one end of which is used to absorb dilution gas, and the other end of which is connected between the first sampling branch pipe and the reference system; Two air inlet pipes, one end of which is used to absorb dilution gas, and the other end of which is connected between the second sampling branch pipe and the measurement system; a fifth flow controller, which is arranged on the first air inlet pipe, is used for controlling the flow rate of the first dilution gas flowing into the reference system; and a sixth flow controller disposed on the second inlet pipe for controlling the flow rate of the second dilution gas flowing into the measurement system.

In an embodiment of the present invention, the system further comprises: an air intake pipe, one end of which is used to absorb outside air, and the other end of which is connected to the first intake pipe and the second intake pipe, and is used to supply the air to all the the first air intake pipe and the second air intake pipe convey the air; and a purifier, which is arranged on the air intake pipe, is used for purifying the air flowing into the air intake pipe.

In another embodiment of the present invention, the system further includes: a control unit, which is connected to at least the reference system and the measurement system and is used for detecting results of the reference system and the measurement system according to the , and determine the particulate matter emission in the measured sample gas.

In yet another embodiment of the present invention, the system further comprises: a gas flow meter, which is arranged on the exhaust gas discharge pipeline and is used for detecting the exhaust gas discharge flow rate in the exhaust gas discharge pipeline; and the control unit It is also connected with the gas flow meter, and is used for determining the emission amount of particulate matter in the exhaust gas at least according to the exhaust gas emission flow rate and the emission amount of particulate matter in the measured sample gas.

In one embodiment of the present invention, the system further comprises: an exhaust manifold, which is connected with the reference system and the measurement system and is used for receiving gas exhausted from the reference system and the measurement system ; and an air extraction device, which is arranged on the exhaust manifold and is used to provide power for gas flow in the system.

In a second aspect of the present invention, there is provided a method for detecting the emission of particulate matter in exhaust gas by using the system according to any one of the first aspect of the present invention, comprising: using a sampling manifold in a sampling device to draw in the exhaust gas discharge pipeline the exhaust gas, and use the first sampling branch pipe and the second sampling branch pipe connected with the sampling main pipe to distribute the drawn exhaust gas sample gas to the reference system and the measurement system; use the particulate matter trapping device in the reference system to flow through the exhaust gas. Capture the particulate matter in the reference sample gas of the reference system, and use the first reaction device in the reference system to process and detect other components in the reference sample gas except the particulate matter; use the measurement system The second reaction device in the device processes and detects the measurement sample gas flowing through the measurement system; and determines the emission amount of particulate matter in the measurement sample gas according to the detection results of the reference system and the measurement system.

From the above description of the technical solution of the present invention and its multiple embodiments, those skilled in the art can understand that in the system for detecting particulate matter emission in exhaust gas of the present invention, by setting the first sampling branch pipe and the second sampling branch pipe, the extracted The exhaust gas sample gas is distributed into the reference system and the measurement system, and the remaining components after removing the particulate matter in the reference sample gas flowing through are processed and detected in real time through the reference system, and the measurement sample gas flowing through the measurement system is processed and detected in real time. Real-time processing and detection for the purpose of detecting particulate emissions by comparing detection results from a reference system and a measurement system. The system of the embodiment of the present invention has the advantages of simple operation and real-time detection, and can effectively avoid the test period of several days for the traditional filter paper weighing method, so that it can be applied to scientific research, quality assurance and emission detection of in-use automobiles and construction machinery pollution sources. and other fields.

Description of drawings

The above-described features of the present invention may be better understood, and its numerous objects, features and advantages made apparent to those skilled in the art by reference to the accompanying drawings, wherein like reference numerals refer to like parts, and wherein:

FIG. 1 is a schematic block diagram illustrating a system for detecting the emission of particulate matter in exhaust gas according to an embodiment of the present invention;

2 is a schematic block diagram illustrating a system including a temperature sensor according to an embodiment of the present invention;

3 is a schematic diagram illustrating a system including a zigzag conduit according to an embodiment of the present invention;

4 is a schematic diagram illustrating a system including a first electrode and a power source according to an embodiment of the present invention;

5 is a schematic diagram illustrating a system including a flow controller according to an embodiment of the present invention; and

6 is a schematic diagram illustrating a system including an intake duct according to an embodiment of the present invention.

Detailed ways

Embodiments of the present invention will now be described with reference to the accompanying drawings. It should be understood that, for simplicity and clarity of illustration, where considered appropriate, reference numerals may be repeated among the figures to indicate corresponding or analogous parts. Furthermore, this application sets forth numerous specific details in order to provide a thorough understanding of the embodiments described herein. However, one of ordinary skill in the art, having the teachings of the present invention, may practice the various embodiments described herein without these specific details. In other instances, well-known methods, procedures and components have not been described in detail so as not to unnecessarily obscure the embodiments described herein. Furthermore, this description should not be taken as limiting the scope of the embodiments described herein.

Aiming at the deficiencies of the prior art, the present invention provides a brand-new and achievable solution. In particular, the present invention realizes real-time detection of particulate matter emission in exhaust gas through sampling by the sampling device, processing and detection of the reference sample gas by the reference system, and processing and detection of the measurement sample gas by the measurement system. In some embodiments, in the system of the embodiment of the present invention, by setting the zigzag measurement pipeline of the measurement system, it is beneficial to realize the capture and detection of particulate matter at the second reaction device in the measurement system. Various embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a schematic block diagram illustrating a system for detecting emission of particulate matter in exhaust gas according to an embodiment of the present invention. As shown in FIG. 1 , the system 100 may include: a sampling device 110 (shown by a dashed box) including a sampling manifold 111 and a first sampling branch 112 and a second sampling branch 113 connected to the sampling manifold 111 , wherein the sampling manifold 110 is connected to the sampling manifold 111 . The exhaust gas discharge pipeline 10 is connected to absorb the exhaust gas in the exhaust gas discharge pipeline 10; the reference system 120 (shown by the dashed box) includes a particulate matter trapping device 121 and a first reaction device 122 connected in sequence, wherein the particulate matter trapping device 122 The device 121 is connected to the first sampling branch pipe 112, and is used to capture the particulate matter in the reference sample gas flowing through the reference system 120, and the first reaction device 122 is used to detect other components in the reference sample gas except for the particulate matter. processing and detection; and a measurement system 130 (shown by a dashed box), including a second reaction device 131 , which is connected to the second sampling branch pipe 113 and is used to process and detect the measurement sample gas flowing through the measurement system 130 .

The first sampling branch pipe 112 and the second sampling branch pipe 113 described above are connected in parallel. The first sampling branch pipe 112 and the second sampling branch pipe 113 can be connected to the sampling manifold 110 in the form of branches of the sampling manifold 110 as shown in the figure, or can be connected to the sampling manifold 110 by connecting a tee. In some embodiments, the sampling manifold 111 and the exhaust gas discharge pipeline 10 may be directly or indirectly connected. The direct connection may be welding, shroud connection, snap connection, screw connection, etc., and the indirect connection may be plug-in contactless connection. connection, connection through connectors, etc. The sampling manifold 111 can be used to draw part or all of the exhaust gas in the exhaust gas discharge line 10 when the engine is working.

For example, in one embodiment, the sampling manifold 111 may be connected to the exhaust gas discharge line 10 in a shrouded manner, so as to absorb all the exhaust gas in the exhaust gas discharge line 10 . In another embodiment, one end of the sampling manifold 111 can be inserted into the exhaust gas discharge pipeline 10 as shown in the figure, so as to absorb part of the exhaust gas (or exhaust gas sample gas) in the exhaust gas discharge pipeline 10, and the sampling manifold 111 The other end of the pipe can be connected to the first sampling branch pipe 112 and the second sampling branch pipe 113, so as to split the exhaust gas sample gas drawn. The exhaust gas discharge pipeline described herein may be the exhaust gas discharge pipeline of a diesel engine or a gasoline engine, etc., or may be the exhaust gas pipeline of other mechanical devices that generate exhaust gas.

In some embodiments, the particulate capture device 121 may be directly or indirectly connected to the first sampling branch pipe 112 . For example, in one embodiment, the particle trapping device 121 and the first sampling branch pipe 112 are connected by a conveying pipeline. In another embodiment, the particle trapping device 121 may be arranged in the conveying pipeline connected with the first sampling branch pipe 112 . In some embodiments, the reference sample gas may be the exhaust gas sample gas flowing through the first sampling branch pipe 112 . That is, the exhaust gas sample gas drawn by the sampling manifold 111 can be distributed as the reference sample gas and the measurement sample gas via the first sampling branch pipe 112 and the second sampling branch pipe 113 . The particulate matter trapping device 121 is used to trap the particulate matter in the reference sample gas, so as to separate the particulate matter from the gas or liquid components in the reference sample gas.

In other embodiments, the particulate matter trapping device 121 may include one or more gas-solid separation devices, and the particulate matter trapping device 121 may capture the particulate matter in the reference sample gas in a variety of ways, for example, Capture by filtration, centrifugation, etc. In one embodiment, particulate capture device 121 may include a filter. In yet another embodiment, the particulate capture device 121 may comprise a cyclone. In another embodiment, the particulate capture device 121 may comprise a hypergravity machine.

The first reaction device 122 described above may be directly or indirectly connected to the particulate matter trapping device 121 . For example, in one embodiment, the first reaction device 122 may be connected with the particulate matter capture device 121 through a conveying pipeline. In another embodiment, the first reaction device 122 may be arranged in a conveying pipeline connected to the particle capture device 121 . The first reaction device 122 can process and detect other components in the reference sample gas except the particulate matter, and use it as a background value to compare with the detection result of the measurement system 130, so as to achieve the purpose of determining the particulate matter emission amount. In one embodiment, the first reaction device 122 may include a reactor such as an oxidizer or a burner to burn or oxidize other components.

Further, the second reaction device 131 may be directly or indirectly connected to the second sampling branch pipe 113 . For example, in one embodiment, the second reaction device 131 and the second sampling branch pipe 113 are connected by a transport pipeline. In another embodiment, the second reaction device 131 may be arranged in a transport pipeline connected to the second sampling branch pipe 113 . In some embodiments, the measurement sample gas may be the exhaust gas sample gas flowing through the second sampling branch pipe 113 . In other embodiments, the second reaction device 131 may have the same structure and detection method as the first reaction device 122 to ensure that the first reaction device 122 and the second reaction device 131 have the same reaction conditions.

Since the second reaction device 131 is directly used to process and detect the measurement sample gas, including the processing and detection of particulate matter in the measurement sample gas, by detecting the difference between the reaction results in the second reaction device 131 and the first reaction device 122 If different, the particulate matter content in the measured sample gas can be obtained, and then the particulate matter emission amount in the exhaust gas sample gas drawn in the sampling manifold 111 and the particulate matter emission amount in the exhaust gas discharge pipeline 10 can be calculated. Further, by maintaining the reaction conditions of the first reaction device 122 and the second reaction device 131 , the gas flowing through can be processed and detected in real time, thereby realizing real-time detection of exhaust particulate matter emissions.

In one embodiment of the present invention, the reference system 120 further includes a first temperature sensor, which can be arranged inside the first reaction device, for detecting the temperature change in the first reaction device; the measurement system 130 further includes a second temperature sensor. A temperature sensor, which can be arranged inside the second reaction device, is used to detect temperature changes in the second reaction device. According to such an arrangement, by monitoring and comparing the temperature changes detected by the first temperature sensor and the second temperature sensor in real time, the difference in reaction changes in the first reaction device and in the second reaction device can be obtained in real time, thereby enabling real-time determination of exhaust particulate matter Effects of transient emissions.

In yet another embodiment of the present invention, the system 100 may further include a control unit, which may be connected with the reference system 120 and the measurement system 130 for: determining the measurement according to the detection results of the reference system 120 and the measurement system 130 The particulate matter emission in the sample gas; and according to the measured particulate matter emission in the sample gas, the particulate matter emission in the exhaust gas discharged from the exhaust gas discharge pipeline 10 is determined. In other embodiments, the detection results according to the reference system 120 and the measurement system 130 may include: according to the difference between the detection results of the reference system 120 and the measurement system 130 .

In one embodiment of the present invention, the system 100 may further include an exhaust manifold, which may be connected with the reference system 120 and the measurement system 130 and used to receive exhaust gas from the reference system 120 and the measurement system 130 . In another embodiment of the present invention, the system 100 may further include an air extraction device, which may be arranged on the exhaust manifold and used to provide power for the gas flow in the system 100, so as to facilitate the extraction of the exhaust gas sample and the extraction of the exhaust gas in the system. flow. In yet another embodiment of the present invention, two gas extraction devices may be connected behind the first reaction device 122 and behind the second reaction device 131 to provide power for gas flow in the reference system and the measurement system, respectively.

The system for detecting the emission of particulate matter in exhaust gas according to an embodiment of the present invention has been exemplarily described above with reference to FIG. 1 , and those skilled in the art can understand that the above description is exemplary rather than limiting. For example, in one embodiment, a flow controller may be further provided on the first sampling branch pipe 112 and the second sampling branch pipe 113 to control the proportion of gas flowing through the first sampling branch pipe 112 and the second sampling branch pipe 113 . In another embodiment, the reference system 120 may further include a first carbon dioxide sensor, which is connected to the first reaction device 122 for detecting the concentration of carbon dioxide produced by the reaction in the first reaction device 122; the measurement system 130 may further include a first carbon dioxide sensor. A carbon dioxide sensor, which is connected to the second reaction device 131, is used to detect the concentration of carbon dioxide produced by the reaction in the second reaction device 131. Based on this, by comparing the difference between the concentrations of carbon dioxide detected by the first carbon dioxide sensor and the second carbon dioxide sensor, Particulate matter emissions from exhaust can be determined.

2 is a schematic block diagram illustrating a system including a temperature sensor according to an embodiment of the present invention. As shown in FIG. 2, the system 200 may include a sampling device, a reference system, and a measurement system, wherein the sampling device may include a sampling manifold 111 and a first sampling branch 112 and a second sampling branch 113 connected to the sampling manifold 111; the reference The system may include a particle capture device 121 (shown in a dashed box), a first reaction device 122 (shown in a dashed box), and a first temperature sensor 213, wherein the first reaction device 122 may include a first filter 211 and a first constant temperature device 212; and the measurement system may include a second reaction device 131 (shown in dashed box).

The first filter 211 described above is coated with an oxidation catalyst. The first filter 211 can be used to filter other components in the reference sample gas except the particulate matter captured by the particulate matter trapping device 121 . In some embodiments, the first filter 211 may include at least one of a filter membrane, a filter mesh, a filter paper, and the like. In other embodiments, the first filter 211 may include one or more filter layers (eg, filter membrane or filter mesh, etc.). In yet other embodiments, the first filter 211 may be a diesel particulate filter (DPF).

In some embodiments, the first filter 211 may be connected with the particulate matter capturing device 121 through a pipeline or may be directly arranged in a pipeline connected with the particulate matter capturing device 121 . In some embodiments, the coating of the oxidation catalyst on the first filter 211 may be coating the surface of the first filter 211 with the oxidation catalyst. In other embodiments, the coating of the oxidation catalyst on the first filter 211 may be coating the oxidation catalyst on the inner surface of the wall of the first filter 211 . In still other embodiments, when the first filter 211 is arranged in the pipeline in the form of, for example, a filter membrane or a filter screen, the oxidation catalyst coated on the first filter 211 may be on the outer surface of the first filter 211 Coated with oxidation catalyst.

The first constant temperature device 212 is arranged on the first filter 211, either outside the first filter 211 or inside the first filter 211, so as to control the temperature of the first filter 211, so as to The reaction temperature in the first filter 211 is controlled. In one embodiment, the first thermostat 212 may be wrapped outside the first filter 211 . In some embodiments, the first constant temperature device 212 may include one or more of a heating component, a cooling component, a temperature sensing component, etc., to control the temperature of the first filter 211 to increase or decrease.

In another embodiment, the first constant temperature device 212 can control the temperature to be above 400° C. to ensure that the reducing substances (for example, including a Carbon monoxide, gaseous hydrocarbons, etc.) are completely oxidized and removed, and the gas after removing the reducing substances can be discharged from the system 200 . The control temperature of the first constant temperature device 212 may not be limited to 400° C., and may also be determined as required.

The first temperature sensor 213 described above may be disposed inside the first filter 211 for detecting temperature changes in the first filter 211 . Since the heat generated by the oxidation reaction will cause a transient change in the temperature inside the first filter 211, by setting the first temperature sensor 213, the transient temperature change in the first filter 211 can be measured in real time, that is, it is possible to detect Temperature changes when oxidation reaction occurs in the first filter 211 .

As further shown in FIG. 2, the second reaction device 131 may include: a second filter 221, which may be coated with an oxidation catalyst; and a second constant temperature device 222, which may be disposed on the second filter 221, For controlling the temperature of the second filter 221 ; the measurement system may further include: a second temperature sensor 223 , which may be arranged inside the second filter 221 , for detecting temperature changes in the second filter 221 . In order to ensure the accuracy of the first reaction device 122 as the reference object, the structural settings and reaction conditions of the first reaction device 122 and the second reaction device 131 can be the same, and the settings of the first reaction device 122 can also be based on the second reaction device. 131 and make corresponding changes.

The second filter 221 described above can be used to filter the measurement sample gas to capture particulate matter in the measurement sample gas. In some embodiments, the second filter 221 may include at least one of a filter membrane, a filter mesh, a filter paper, and the like. In other embodiments, the second filter 221 may include one or more filter layers (eg, filter membrane or filter mesh, etc.). In yet other embodiments, the second filter 221 may be a diesel particulate filter (DPF).

In some embodiments, the second filter 221 may be connected with the second sampling branch pipe 113 through a pipeline or may be directly arranged in the pipeline connected with the second sampling branch pipe 113 . In some embodiments, the coating of the oxidation catalyst on the second filter 221 may be coating the surface of the second filter 221 with the oxidation catalyst. In other embodiments, the coating of the oxidation catalyst on the second filter 221 may be coating the oxidation catalyst on the inner surface of the wall of the second filter 221 . In still other embodiments, when the second filter 221 is arranged in the pipeline in the form of, for example, a filter membrane or a filter screen, the oxidation catalyst coated on the second filter 221 may be on the outer surface of the second filter 221 Coated with oxidation catalyst.

The second constant temperature device 222 described above is arranged on the second filter 221, and can be arranged outside the second filter 221 or inside the second filter 221, so as to be used to control the second filter 221 in order to control the reaction temperature in the second filter 221. In one embodiment, the second constant temperature device 222 may be wrapped outside the second filter 221 . In some embodiments, the second constant temperature device 222 may include one or more of a heating component, a cooling component, a temperature sensing component, etc., to control the temperature of the second filter 221 to increase or decrease.

In another embodiment, the temperature of the second constant temperature device 222 can be controlled to be above 400° C. to ensure that the reducing substances contained in the measurement sample gas (for example, may include: Carbon monoxide, gaseous hydrocarbons, particulate matter, etc.) are completely oxidized and removed, and the gas after removing the reducing substances can be discharged from the system 200 . The control temperature of the second constant temperature device 222 may not be limited to 400° C., and may also be determined as required.

Further, the second temperature sensor 223 may be disposed inside the second filter 221 for detecting temperature changes in the second filter 221 . Due to the heat generated by the oxidation reaction, the temperature inside the second filter 221 will change transiently. By setting the second temperature sensor 223, the transient temperature change in the second filter 221 can be measured in real time, that is, the temperature can be detected in real time. Temperature changes when oxidation reaction occurs in the second filter 221 .

According to such a setting, since the particulate matter contained in the reference sample gas flowing through the reference system has been separated by the particulate matter trapping device 121, and the particulate matter contained in the measurement sample gas flowing through the measurement system has not been filtered in advance, therefore The heat generated by the oxidation reaction in the second reaction device of the measurement system will be greater than the heat generated by the oxidation reaction in the first reaction device of the reference system, and the specific heat difference between the two can be determined by the first temperature sensor 213 and the heat generated. The real-time measurement value of the second temperature sensor 223 is determined, and the real-time particulate matter content in the measured sample gas can be calculated according to the heat difference, and then the real-time particulate matter emission amount in the exhaust gas can be calculated. In some embodiments, by controlling the flow rate of the exhaust gas sample gas flowing through the first sampling branch pipe 112 and the second sampling branch pipe 113 to be the same, according to the above heat difference value, it can also be obtained that the real-time particulate matter trapping device 121 in the reference system can be obtained in real time. Amount of particulate matter separated.

In yet another embodiment of the present invention, the particle trapping device 121 may include: a third filter 231, which may be connected to the first sampling branch pipe 112 and used to filter the reference sample gas to capture the reference sample particulate matter in the air; and a third constant temperature device 232 , which may be arranged on the third filter 231 for controlling the temperature of the third filter 231 .

In some embodiments, the third filter 231 may include at least one of a filter membrane, a filter mesh, a filter paper, and the like. In other embodiments, the third filter 231 may include one or more filter layers (eg, filter membrane or filter mesh, etc.). In still other embodiments, the third filter 231 may be a diesel particulate filter (DPF). In some embodiments, the third filter 231 may be connected to the first sampling branch pipe 112 through a pipeline, or may be directly arranged in the pipeline connected to the first sampling branch pipe 112 .

The third constant temperature device 232 described above is arranged on the third filter 231, may be arranged outside the third filter 231, or may be arranged inside the third filter 231 for controlling the third filter 231 filtration temperature. In one embodiment, the third constant temperature device 232 may be wrapped outside the third filter 231 . In some embodiments, the third constant temperature device 232 may include one or more of a heating component, a cooling component, a temperature sensing component, etc., to control the temperature of the third filter 231 to increase or decrease.

In another embodiment, the third constant temperature device 232 can control the temperature within the range of 47±5°C, or the sampling temperature defined by other test standards or specifications. Since the properties of particulate matter will change according to the type and temperature of the particulate matter, for example, when the temperature exceeds a certain temperature, certain particle sizes or certain types of particulate matter will be transformed from solid to gaseous state, so it can be determined according to the type of particulate matter to be detected, etc. The temperature of the third constant temperature device 232 is controlled, so that the third filter 231 traps the required particulate matter at the set temperature.

The system including a temperature sensor according to an embodiment of the present invention has been exemplarily described above with reference to FIG. 2 . It should be understood that the structure shown in the figure is exemplary rather than limiting, for example, a particle trapping device The connection between 121 and the first reaction device 122 may not be limited to a straight pipe, and may also be set to a pipe of other shapes, which will be exemplarily described below with reference to FIG. 3 .

3 is a schematic diagram illustrating a system including a zigzag conduit according to an embodiment of the present invention. As shown in FIG. 3 , system 300 may include a sampling device, reference system 120 (shown in dashed box), and measurement system 130 (shown in dashed box), wherein the sampling device may include sampling manifold 111 and a connection to sampling manifold 111 The first sampling branch pipe 112 and the second sampling branch pipe 113 ; the reference system 120 may include a particle trapping device 121 and a first reaction device 122 , and the measurement system 130 may include a second reaction device 131 .

As further shown in FIG. 3 , in one embodiment of the present invention, the reference system 120 may further include: a zigzag reference pipeline, which is connected between the particle trapping device 121 and the first reaction device 122 , and may include a first upstream pipeline 311 , a first midstream pipeline 312 and a first downstream pipeline 313 connected in sequence along a zigzag shape, wherein the first upstream pipeline 311 is connected to the particulate capture device 121 , the first connection 314 of the first upstream pipeline 311 and the first midstream pipeline 312 can be connected to the first reaction device 122 . Correspondingly, the measurement system 130 may further include: a zigzag-shaped measurement pipeline, which is connected between the second sampling branch pipe 113 and the second reaction device 131, and may include a second upstream pipeline connected in sequence along the zigzag shape 321, the second midstream pipeline 322, and the second downstream pipeline 323, wherein the second upstream pipeline 321 is connected to the second sampling branch pipe 113, and the second upstream pipeline 321 is connected to the second midstream pipeline 322. The second connection 324 may be connected to the second reaction device 131 .

The zigzag shape described above may include a positive zigzag shape or an inverted zigzag shape. For example, the zigzag shape shown in FIG. 3 is an inverted zigzag shape. In one embodiment of the present invention, the first upstream section pipeline 311, the first midstream section pipeline 312 and the first downstream section pipeline 313 may be arranged in parallel as shown in the figure; and the second upstream section The pipeline 321 , the second midstream pipeline 322 and the second downstream pipeline 323 may be arranged in parallel as shown in the figure. In another embodiment, the first upstream section pipeline 311, the first midstream section pipeline 312 and the first downstream section pipeline 313 may be arranged at an angle; and the second upstream section pipeline 321, the second The midstream section pipeline 322 and the second downstream section pipeline 323 may be arranged at an angle.

In some embodiments, the lengths of the first upstream pipe 311, the first midstream pipe 312 and the first downstream pipe 313 may be the same or different; and the second upstream pipe 321, the second midstream The lengths of the section pipeline 322 and the second downstream section pipeline 323 may be the same or different, wherein the lengths of the first upstream section pipeline 311 and the second upstream section pipeline 321 may be the same, and the first midstream section pipeline 312 and the second upstream section pipeline 321 may have the same length. The lengths of the second midstream pipelines 322 may be the same, and the lengths of the first downstream pipelines 313 and the second downstream pipelines 323 may be the same.

In other embodiments, the inner diameters of the first upstream pipeline 311 , the first midstream pipeline 312 and the first downstream pipeline 313 may be the same or different; and the second upstream pipeline 321 , the second downstream pipeline 313 The inner diameters of the midstream pipeline 322 and the second downstream pipeline 323 may be the same or different, wherein the inner diameters of the first upstream pipeline 311 and the second upstream pipeline 321 may be the same, and the first midstream pipeline 312 The inner diameter of the second midstream pipeline 322 may be the same, and the inner diameter of the first downstream pipeline 313 and the second downstream pipeline 323 may be the same.

In yet another embodiment of the present invention, the inner diameter of the zigzag reference pipeline can be larger than the inner diameter of the first sampling branch pipe 112 ; Since the exhaust gas flow rate is fast, it is not conducive to the capture and treatment of particulate matter in the exhaust gas. Therefore, by setting a Z-shaped reference pipeline and a Z-shaped measurement pipeline with a larger inner diameter, the Z-shaped reference pipeline can be entered into the Z-shaped reference pipeline. The flow rate of the sample gas in the circuit and the Z-shaped measurement pipeline is reduced, which is beneficial to the capture and oxidation treatment of the particulate matter in the sample gas. In some embodiments, in order to ensure the consistency of the background values of the reference system and the measurement system, the inner diameters of the Z-shaped reference pipeline and the Z-shaped measurement pipeline can be set to be the same. In still other embodiments, the inner diameter of the pipeline where the particulate matter trapping device 121 is located may be the same as the inner diameter of the Z-shaped reference pipeline.

The system including the zigzag pipeline according to the embodiment of the present invention has been exemplarily described above with reference to FIG. 3 . It should be noted that, according to the setting of the zigzag pipeline in this embodiment, it is possible to realize the detection of the sample gas. Divide again. Specifically, taking the Z-shaped measurement pipeline as an example, by disposing the second reaction device 131 at the second connection 324, part of the sample gas in the measurement sample gas can be processed and detected. Since the heat change generated by the oxidation reaction is small, the heat signal (such as temperature change signal) generated by the heat change is small, and the detection of the heat signal is not conducive to the sample gas with a large flow rate, especially for the first reaction device. In the oxidation reaction, the resulting heat signal will be more difficult to detect. Compared with the sample gas with a large flow rate, the temperature sensor will be more sensitive and accurate in detecting temperature changes in the sample gas with a small flow rate. Therefore, by splitting the measurement sample gas, the heat signal detection can be performed in a small sample gas flow rate, which is beneficial to improve the sensitivity and accuracy of the detection. In some embodiments, flow controllers may be provided at the exhaust ends of the first reaction device 122, the second reaction device 131, the first downstream section pipeline 313 and the second downstream section pipeline 323, respectively, to achieve control and The purpose of detecting the sample gas flow in each pipeline. In order to further improve the accuracy of the detection results, the present invention also provides embodiments such as promoting particle enrichment, which will be described in detail below with reference to FIG. 4 .

4 is a schematic diagram illustrating a system including a first electrode and a power source according to an embodiment of the present invention. As shown in FIG. 4, the system 400 may include a sampling device, a reference system, and a measurement system, wherein the sampling device may include a sampling manifold 111 and a first sampling branch 112 and a second sampling branch 113 connected to the sampling manifold 111; the reference The system may include a particle trapping device 121, a zigzag reference line and a first reaction device 122, and the measurement system may include a zigzag measurement line and a second reaction device 131, wherein the zigzag reference line may include The first upstream section pipeline 311, the first midstream section pipeline 312 and the first downstream section pipeline 313, the Z-shaped measuring pipeline may include the second upstream section pipeline 321, the second midstream section pipeline 322 and the second Downstream section line 323.

Compared with the system 300 shown in FIG. 3, the measurement system shown in the system 400 shown in FIG. 4 may further include a first electrode 410, which may be arranged in the second upstream section pipeline 321; and a connecting pipe 420, It can be connected between the second connection 324 and the second reaction device 131; the system 400 can also include: a power source 430, the first pole of which can be connected to the connecting tube 420, and the second pole of which can be connected to the first electrode 410 and the second pole. The two upstream pipelines 321 are connected, wherein the first pole can be one of the positive and negative poles, and the second pole can be the other of the positive and negative poles.

In some embodiments, the first electrode 410 may be implemented in the form of a plate. In other embodiments, the connecting pipe 420 may be a straight pipe. The provision of the connecting tube 420 can facilitate the placement of the electric field therein. In still other embodiments, the pipe wall of the connecting pipe 420 , the pipe wall of the first electrode 410 and the pipe wall of the second upstream pipeline 321 may all be made of metal material. The connection between the first pole and the connecting tube 420 may be connected to the wall of the connecting tube 420 , so that the inner wall of the connecting tube 420 carries the electric charge of the first pole. The second pole is connected to the second upstream section pipeline 321 , and may be connected to the wall of the second upstream section pipeline 321 , so that the inner wall of the second upstream section pipeline 321 carries the charge of the second pole. In order to facilitate the description of the beneficial effects of this embodiment, the first pole is taken as an example of a positive pole and the second pole of a negative pole is used as an example for description in conjunction with FIG. 4 .

As shown in FIG. 4 , by connecting the negative electrode of the power source 430 to the first electrode 410 and the second upstream pipeline 321 , the first electrode 410 and the second upstream pipeline 321 can be negatively charged. Based on this On the other hand, the particulate matter in the measurement sample gas flowing through the second upstream section pipeline 321 is also negatively charged. At the same time, the positive electrode of the power supply 430 is connected to the connecting pipe 420, so that the connecting pipe 420 has a positive charge. When the negatively charged particles flow through the second connection 324, they are more likely to be attracted by the positive charge in the connecting pipe 420. , so as to accumulate in the connecting pipe 420 to obtain concentration, and flow to the second reaction device 131 . According to such an arrangement, the concentration of the particulate matter flowing through the second reaction device 131 can be effectively increased, which is beneficial to the capture of the particulate matter in the measurement sample gas by the second reaction device 131 and the enhancement of the intensity of the generated heat signal, thereby significantly improving the sensitivity to Accuracy of test results for measuring particulate emissions in sample gas.

As further shown in FIG. 4 , in another embodiment of the present invention, the measurement system may further include: a second electrode 440 , which may be arranged in the second midstream pipeline 322 ; and a second electrode of the power source 430 It can also be connected to the second electrode 440 and the second midstream section pipeline 322 . In some embodiments, the second electrode 440 may be implemented in the form of a plate. In other embodiments, the walls of the second electrode 440 and the second midstream pipeline 322 may both be made of metal. The second pole is connected to the second midstream section pipeline 322 , and may be connected to the wall of the second midstream section pipeline 322 , so that the inner wall of the second midstream section pipeline 322 carries the charge of the second pole. In order to facilitate the description of the beneficial effects of this embodiment, the first pole is a positive pole and the second pole is a negative pole as an example, and the description is made in conjunction with FIG. 4 .

By connecting the negative electrode of the power source 430 to the second electrode 440 and the second midstream section pipeline 322 , the second electrode 440 and the second midstream section pipeline 322 can be negatively charged. According to this setting, the negatively charged second electrode 440 and the second midstream section pipeline 322 have a charge repulsion effect on the negatively charged particulate matter, which can effectively prevent the particulate matter from entering the second midstream section pipeline 322 and flowing into downstream, so as to further facilitate the enrichment of particulate matter at the connecting pipe 420, which has a significant effect and effect on improving the accuracy of the detection result.

The system including the first electrode and the power source according to the embodiment of the present invention has been exemplarily described above with reference to FIG. 4. It can be understood that the above description is exemplary rather than limiting, for example, the first electrode may not be limited to the positive electrode , in other application scenarios, the first pole can also be set as a negative pole, and the second pole can be set as a positive pole, so that the particles are positively charged, so as to be enriched at the negatively charged connecting tube 420 . In other embodiments, according to the settings of the first electrode and the like in the measurement system, corresponding settings may also be performed in the reference system, which will not be repeated here. In still other embodiments, the concentration of particulate matter flowing through the second reaction device can be further increased by controlling the flow rate. It will be described below with reference to FIG. 5 .

5 is a schematic diagram illustrating a system including a flow controller according to an embodiment of the present invention. As shown in FIG. 5 , the system 500 may include a sampling device, a reference system, a measurement system, and a power source 430 , wherein the sampling device may include a sampling manifold 111 and a first sampling branch 112 and a second sampling branch connected to the sampling manifold 111 113; the reference system may include a particle trapping device 121, a zigzag reference pipeline and a first reaction device 122, and the measurement system may include a zigzag measurement pipeline, a first electrode 410, a second electrode 440, a connecting pipe 420 and the second reaction device 131, wherein the Z-shaped reference pipeline may include the first upstream section pipeline 311, the first mid-stream section pipeline 312 and the first downstream section pipeline 313, and the Z-shaped measurement pipeline may include The second upstream section pipeline 321 , the second midstream section pipeline 322 and the second downstream section pipeline 323 . The above has been described in detail with reference to FIG. 4 , and details are not repeated here.

As further shown in FIG. 5 , in one embodiment of the present invention, the reference system may further include: a first flow controller 510 , which may be connected to the exhaust end of the first downstream pipeline 313 for Control the flow rate of the first gas flowing through the pipeline 313 of the first downstream section; Two gas flow; the measurement system may further include: a third flow controller 530, which may be connected to the exhaust end of the second downstream section pipeline 323 for controlling the third gas flow through the second downstream section pipeline 323 and a fourth flow controller 540, which can be connected to the exhaust end of the second reaction device 131 for controlling the flow rate of the fourth gas flowing through the second reaction device 131.

In some embodiments, the exhaust end can be understood as the outlet of the gas flowing out of the corresponding pipeline or device. In other embodiments, the first flow controller 510, the second flow controller 520, the third flow controller 530 and the fourth flow controller 540 may be mass flow controllers. Further, the system 500 may further include: a control unit 550, which may be connected with the first flow controller 510, the second flow controller 520, the third flow controller 530 and the fourth flow controller 540, and is used for: controlling the first flow controller 510, the second flow controller 520, the third flow controller 530 and the fourth flow controller 540. The second gas flow is smaller than the first gas flow; the fourth gas flow is controlled to be smaller than the third gas flow; the first gas flow is controlled to be equal to the third gas flow; and the second gas flow is controlled to be equal to the fourth gas flow. In some embodiments, the control unit 550 may include one or more of a processor, a smart terminal, a calculator, and the like.

It can be understood that by controlling the second gas flow rate to be smaller than the first gas flow rate and controlling the fourth gas flow rate to be smaller than the third gas flow rate, the concentration of the sample gas components entering the first reaction device 122 and the second reaction device 131 can be further concentrated. Especially when combined with the features of the first electrode 410 and the power source 430, the particulate matter in the connecting pipe 420 can be enriched and the gas flow rate can be reduced at the same time, thereby greatly improving the sample gas entering the second reaction device 131. The particle concentration is beneficial to improve the accuracy of the detection result of the particle content.

Further, by controlling the first gas flow rate to be equal to the third gas flow rate, and controlling the second gas flow rate to be equal to the fourth gas flow rate, not only can the gas flow rates entering the first sampling branch pipe 112 and the second sampling branch pipe 113 be the same, that is, equivalent to The average distribution of the exhaust gas sample gas drawn by the sampling manifold 111 is beneficial to the subsequent calculation of the emission of particulate matter in the exhaust gas, and it can also ensure that the background value detected by the reference system can be the same as the actual background value of the measurement system. The difference between the two can obtain accurate particle detection results.

The system including the flow controller according to the embodiment of the present invention has been exemplarily described above with reference to FIG. 5. It can be understood that the above description is exemplary rather than limiting, for example, in another embodiment , and may also include a device for diluting the sample gas, which will be exemplified below with reference to FIG. 6 .

6 is a schematic diagram illustrating a system including an intake duct according to an embodiment of the present invention. As shown in FIG. 6, the system 600 may include a sampling device, a reference system, a measurement system, and a power source 430, wherein the sampling device may include a sampling manifold 111, a first sampling branch 112, and a second sampling branch 113; the reference system may include The particle trapping device 121, the Z-shaped reference pipeline, the first reaction device 122, the first flow controller 510 and the second flow controller 520, the measurement system may include a Z-shaped measurement pipeline, the first electrode 410, The second electrode 440, the connecting pipe 420, the second reaction device 131, the third flow controller 530 and the fourth flow controller 540, wherein the Z-shaped reference pipeline may include the first upstream section pipeline 311, the first midstream The section pipeline 312 and the first downstream section pipeline 313 , the Z-shaped measurement pipeline may include a second upstream section pipeline 321 , a second mid-stream section pipeline 322 and a second downstream section pipeline 323 . The above has been described in detail with reference to FIG. 5 , and details are not repeated here.

In yet another embodiment of the present invention, the system 600 may further include: a first inlet pipe 610, one end of which is used to absorb the dilution gas, and the other end of which may be connected between the first sampling branch pipe 112 and the reference system; the second The intake pipe 620, one end of which is used to absorb the dilution gas, the other end of which can be connected between the second sampling branch pipe 113 and the measurement system; the fifth flow controller 630, which can be arranged on the first intake pipe 610, is used for controlling the flow of the first dilution gas into the reference system; and a sixth flow controller 640, which may be disposed on the second inlet pipe 620, for controlling the flow of the second dilution gas into the measurement system.

Specifically, as shown in FIG. 6 , the other end of the first intake pipe 610 may be connected between the first sampling branch pipe 112 and the particulate matter trapping device 121 in the reference system, and the other end of the second intake pipe 620 may be connected between the second sampling branch pipe 113 and the zigzag measuring pipe in the measuring system. In some embodiments, the dilution gas may be air. In other embodiments, the diluent gas may include an inert gas or a non-reducing gas or the like. The dilution gas is the gas used to dilute the reference sample gas in the reference system and the measurement sample gas in the measurement system.

By mixing and diluting the sample gas before entering the reference system and the measuring system, the temperature of the sample gas entering the system can be lowered, so as to avoid damage to the equipment in the system caused by the high-temperature exhaust sample gas, and reduce the high temperature of the sample gas It can also dilute (or reduce) the flow rate of the sample gas, which is beneficial to the subsequent devices such as the particle trapping device 121 to capture and detect the particulate matter in the mixed gas.

Further, by setting the fifth flow controller 630 and the sixth flow controller 640, the flow of the dilution gas entering the system can be controlled, thereby controlling the temperature of the diluted sample gas and facilitating the subsequent estimation of exhaust particulate matter emissions. In some embodiments, the fifth flow controller 630 and the sixth flow controller 640 may be mass flow controllers. In other embodiments, the inner diameter of the Z-shaped reference pipeline may be larger than the inner diameter of the first intake pipe 610 , and the inner diameter of the Z-shaped measurement pipeline may be larger than the inner diameter of the second intake pipe 620 .

As further shown in FIG. 6 , in one embodiment of the present invention, the system 600 may further include: an air intake pipe 650 , one end of which is used to suck outside air (the air flow direction shown by the arrow in the figure), which The other end is connected with the first air intake pipe 610 and the second air intake pipe 620 , and is used for delivering air to the first air intake pipe 610 and the second air intake pipe 620 . In another embodiment, the system 600 may further include a purifier 660 , which may be disposed on the air intake duct 650 for purifying the air flowing into the air intake duct 650 . In this embodiment, the dilution gas may be purified air. In still other embodiments, the connection of the air intake pipe 650 to the first intake pipe 610 and the second intake pipe 620 may not be limited to the form of a branch as shown in the figure, but may also be implemented by connecting a tee.

By arranging the same air inlet pipe to deliver the dilution gas to the first inlet pipe 610 and the second inlet pipe 620, it can be ensured that the composition of the dilution gas entering the first inlet pipe 610 and the second inlet pipe 620 are exactly the same, which is beneficial to avoid the dilution gas The possible impact on the test results, and then help to ensure the accuracy of the test results. In another embodiment of the present invention, the first air intake pipe 610 and the second air intake pipe 620 may also be connected to different air intake pipes respectively, so as to control the air sources input to the first air intake pipe 610 and the second air intake pipe 620 respectively.

Further, in another embodiment of the present invention, the system 600 may further include: a gas flow meter 670 , which may be arranged on the exhaust gas discharge pipeline 10 for detecting the exhaust gas flow rate in the exhaust gas discharge pipeline 10 . For ease of understanding, in the figures, the gas flow meter 670 is arranged in the exhaust pipe 10 of the diesel engine as an example for illustration. In some embodiments, the gas flow meter 670 may be disposed inside the exhaust gas discharge line 10 . In other embodiments, the gas flow meter 670 may be arranged outside the exhaust gas discharge line 10 . The real-time (or instantaneous) total amount of exhaust gas emissions (eg, total mass or total volume, etc.) can be obtained according to the exhaust gas emission flow rate detected in real time by the gas flow meter 670 .

As further shown in FIG. 6, the system 600 may also include a control unit 550, which may be connected at least with the reference system and the measurement system (the connection relationship is shown in dotted lines in the figure), and may be used to control the reference system and the measurement system according to the The detection results of the system determine the amount of particulate matter emitted in the measurement sample gas. In some embodiments, the control unit 550 may determine the emission amount of particulate matter in the measured sample gas according to the difference between the signals detected by the first reaction device and the second reaction device. In other embodiments, the control unit 550 may determine the emission amount of particulate matter in the measured sample gas according to the difference in temperature changes detected by the first temperature sensor and the second temperature sensor. In still other embodiments, the connection between the control unit 550 and each device in the system may include a wireless connection or a wired connection. The control unit 550 is connected with each device, and is used for controlling the operation of each device, and determining the emission amount of particulate matter in the exhaust gas according to the data detected by each device.

The control unit 550 in the illustration can be connected with the particulate matter capture device 121, the first reaction device 122, the first temperature sensor (not shown in the figure), the first flow controller 510 and the second flow controller in the reference system 520 is connected, which can be used to: control the temperature of the constant temperature device of the particle trapping device 121 and the first reaction device 122; receive the temperature change data detected by the first temperature sensor; and control the first gas flow rate of the first flow controller 510 and the second gas flow of the second flow controller 520 . The control unit 550 can be connected with the second reaction device 131, the second temperature sensor (not shown in the figure), the third flow controller 530 and the fourth flow controller 540 in the measurement system, and can be used for: controlling the second reaction temperature of the second thermostat of the device 131 ; receiving temperature change data detected by the second temperature sensor; and controlling the third gas flow rate of the third flow controller 530 and the fourth gas flow rate of the fourth flow controller 540 .

Further, the control unit 550 can also be connected with the gas flow meter 670, and is configured to determine the emission amount of particulate matter in the exhaust gas at least according to the exhaust gas emission flow rate and the measured emission amount of particulate matter in the sample gas. Specifically, according to the first gas flow rate, the second gas flow rate, the third gas flow rate, the fourth gas flow rate, and the exhaust gas discharge flow rate, the exhaust gas sample gas used for detection and the total exhaust gas emission in the exhaust gas discharge pipeline 10 can be obtained. The proportional relationship between the reference sample gas and the measurement sample gas, so that the particulate matter emission in the exhaust gas can be determined. Further, the exhaust gas discharge flow in the exhaust gas discharge pipeline 10 can be monitored in real time through the gas flow meter 670, and the first flow controller 510, the second flow controller 520, the third flow controller 530 and the fourth flow controller can be controlled 540, to achieve the purpose of maintaining a certain proportion of sampling during the sampling process, which is conducive to the subsequent detection and analysis of particulate matter emissions, thereby ensuring the accuracy of detection.

In some embodiments, the control unit 550 can also be connected to the fifth flow controller 630 and the sixth flow controller 640, and can be used to detect the gas flow meter 670 and each flow controller when the dilution gas is input into the system. The proportional relationship between the obtained values, and the measurement of the particulate matter emission in the sample gas, determine the particulate matter emission in the exhaust gas.

As shown in FIG. 6, the system 600 may also include an exhaust manifold 680 and an air extraction device 690, wherein the exhaust manifold 680 may communicate with the exhaust of the first flow controller 510 and the second flow controller 520 in the reference system It can also be connected to the exhaust end of the third flow controller 530 and the fourth flow controller 540 in the measurement system, and is used to receive the gas exhausted from the reference system and the measurement system so as to be exhausted to the outside (see Fig. direction of gas flow indicated by the arrow in the illustration).

The air extraction device 690 described above can be arranged on the exhaust manifold 680 and used to provide the power of the gas flow in the system 600, for example, it can include the power in the sampling process and the gas flow process. In one embodiment, the suction device 690 can provide the power for the sampling manifold 111 to suck the exhaust gas. In another embodiment, the air suction device 690 may provide the power for the air intake pipe 650 to draw outside air. In yet other embodiments, the air extraction device 690 may be a centrifugal pump or the like.

In a second aspect of the present invention, there is provided a method for detecting the emission of particulate matter in exhaust gas using the system described in any of the above-mentioned FIGS. 1 to 6 of the present invention, comprising: using the sampling manifold in the sampling device to absorb the exhaust gas emission The exhaust gas in the pipeline, and the first sampling branch pipe and the second sampling branch pipe connected with the sampling main pipe are used to distribute the sucked exhaust gas sample gas to the reference system and the measurement system; the particulate matter trapping device in the reference system is used to convect the flow through The particulate matter in the reference sample gas of the reference system is captured, and the first reaction device in the reference system is used to process and detect other components other than the particulate matter in the reference sample gas; The second reaction device processes and detects the measurement sample gas flowing through the measurement system; and determines the emission amount of particulate matter in the measurement sample gas according to the detection results of the reference system and the measurement system. The method according to the embodiment of the present invention has been described in detail in conjunction with the system above, and will not be repeated here.

Through the above description, those skilled in the art can understand that in the above-mentioned solution of the present invention and its different embodiments, two branches of the reference system and the measurement system are set to perform synchronous detection and comparison, and the detection result of the reference system is used as the The background value of the detection result of the measurement system is used to achieve the purpose of detecting the emission of particulate matter; and since the reactions in the first reaction device and the second reaction device are both carried out in real time, the detection data can be obtained in real time. Therefore, based on the system of the embodiment of the present invention, It can be realized as real-time detection of particulate matter emissions in exhaust gas. The system according to the embodiment of the present invention also has the advantages of simple operation, low cost, accurate measurement results, etc., and the system has a wide application range and can be widely used in motor vehicles or construction machinery powered by diesel or gasoline engines. For example, in some application scenarios, the system of the embodiment of the present invention may be stably installed on a diesel engine-powered vehicle or machine, so as to accurately measure the actual instantaneous particulate matter emission condition during its operation, or at the end of the operation condition. Then, the total amount of particulate matter emissions can be quickly calculated based on the collected data.

Further, the embodiments of the present invention also provide various implementations for improving the accuracy of the detection result. For example, in some embodiments, by arranging a zigzag reference line and a zigzag measurement line, it is beneficial to improve the heat signal in the reaction device for easy detection. In other embodiments, the arrangement of the first electrode, power supply, etc., facilitates the enrichment and directional flow of particulate matter, thereby helping to increase the concentration of particulate matter entering the second reaction device, thereby improving the accuracy and reliability of detection. In still other embodiments, by setting the first flow controller 510, the second flow controller 520, the third flow controller 530 and the fourth flow controller 540, the first sampling branch 112 and the second sampling branch 113 can be controlled The gas distribution ratio can be improved and the accuracy of the test results can be improved.

While this specification has shown and described various embodiments of the present invention, it will be obvious to those skilled in the art that such embodiments have been provided by way of example only. Numerous modifications, changes and substitutions will occur to those skilled in the art without departing from the spirit and spirit of the invention. It should be understood that various alternatives to the embodiments of the invention described herein may be employed in practicing the invention. The appended claims are intended to define the scope of the invention, and therefore to cover the component parts, equivalents, or alternatives within the scope of these claims.

Claims (10)

1. A system for detecting an amount of particulate matter emitted from an exhaust gas, comprising:

the sampling device comprises a sampling main pipe, a first sampling branch pipe and a second sampling branch pipe, wherein the first sampling branch pipe and the second sampling branch pipe are connected with the sampling main pipe;

the reference system comprises a particulate matter trapping device and a first reaction device which are sequentially connected, wherein the particulate matter trapping device is connected with the first sampling branch pipe and is used for trapping particulate matters in a reference sample gas flowing through the reference system, and the first reaction device is used for treating and detecting other components except the particulate matters in the reference sample gas; and

and the measuring system comprises a second reaction device which is connected with the second sampling branch pipe and is used for processing and detecting the measuring sample gas flowing through the measuring system.

2. The system of claim 1, wherein the first reaction device comprises:

a first filter on which an oxidation catalyst is coated; and

a first thermostat disposed on the first filter for controlling a temperature of the first filter;

the reference system further comprises:

a first temperature sensor disposed inside the first filter for detecting a temperature change inside the first filter;

preferably, the second reaction device comprises:

a second filter on which an oxidation catalyst is coated; and

a second thermostat disposed on the second filter for controlling a temperature of the second filter;

the measurement system further comprises:

a second temperature sensor disposed inside the second filter for detecting a temperature change inside the second filter;

preferably, the particulate matter trapping device includes:

a third filter connected to the first sampling branch pipe and configured to filter the reference sample gas to trap the particulate matter in the reference sample gas; and

a third thermostatic device arranged on the third filter for controlling the temperature of the third filter.

3. The system according to claim 1 or 2, wherein the reference system further comprises:

the Z-shaped reference pipeline is connected between the particulate matter trapping device and the first reaction device and comprises a first upstream pipeline, a first midstream pipeline and a first downstream pipeline which are sequentially connected along a Z shape, wherein the first upstream pipeline is connected with the particulate matter trapping device, and a first connection part of the first upstream pipeline and the first midstream pipeline is connected with the first reaction device;

the measurement system further comprises:

the Z-shaped measuring pipeline is connected between the second sampling branch pipe and the second reaction device and comprises a second upstream section pipeline, a second midstream section pipeline and a second downstream section pipeline which are sequentially connected along a Z shape, wherein the second upstream section pipeline is connected with the second sampling branch pipe, and a second connection part of the second upstream section pipeline and the second midstream section pipeline is connected with the second reaction device;

preferably, the first upstream section pipeline, the first midstream section pipeline and the first downstream section pipeline are arranged in parallel; and

the second upstream section pipeline, the second midstream section pipeline and the second downstream section pipeline are arranged in parallel.

4. The system of claim 3, wherein,

the inner diameter of the Z-shaped reference pipeline is larger than that of the first sampling branch pipe; and

the inner diameter of the Z-shaped measuring pipeline is larger than that of the second sampling branch pipe.

5. The system of claim 3 or 4, the measurement system further comprising:

a first electrode disposed in the second upstream segment of tubing; and

a connecting pipe connected between the second connection point and the second reaction device;

the system further comprises:

a power supply having a first pole connected to the connection pipe and a second pole connected to the first electrode and the second upstream pipe, wherein the first pole is one of a positive pole and a negative pole, and the second pole is the other of the positive pole and the negative pole;

preferably, the measurement system further comprises:

a second electrode disposed in the second midstream section of tubing; and is

The second pole of the power supply is also connected with the second electrode and the second midstream section pipeline;

preferably, the first pole is a positive pole and the second pole is a negative pole.

6. The system according to any of claims 3-5, wherein the reference system further comprises:

the first flow controller is connected with the exhaust end of the first downstream pipeline and is used for controlling the flow of the first gas flowing through the first downstream pipeline; and

the second flow controller is connected with the exhaust end of the first reaction device and is used for controlling the flow of the second gas flowing through the first reaction device;

the measurement system further comprises:

a third flow controller connected to the exhaust end of the second downstream pipeline, for controlling a third gas flow flowing through the second downstream pipeline; and

the fourth flow controller is connected with the exhaust end of the second reaction device and is used for controlling the flow of a fourth gas flowing through the second reaction device;

preferably, the system further comprises:

a control unit connected to the first flow controller, the second flow controller, the third flow controller, and the fourth flow controller, and configured to:

controlling the second gas flow rate to be less than the first gas flow rate;

controlling the fourth gas flow to be less than the third gas flow;

controlling the first gas flow rate to be equal to the third gas flow rate; and

controlling the second gas flow rate to be equal to the fourth gas flow rate.

7. The system of any of claims 1-6, further comprising:

one end of the first gas inlet pipe is used for sucking diluent gas, and the other end of the first gas inlet pipe is connected between the first sampling branch pipe and the reference system;

one end of the second gas inlet pipe is used for sucking diluent gas, and the other end of the second gas inlet pipe is connected between the second sampling branch pipe and the measuring system;

a fifth flow controller disposed on the first gas inlet line for controlling the flow of the first diluent gas into the reference system; and

a sixth flow controller, arranged on the second gas inlet pipe, for controlling the flow of the second dilution gas flowing into the measurement system;

preferably, the system further comprises:

one end of the air inlet pipe is used for sucking outside air, and the other end of the air inlet pipe is connected with the first air inlet pipe and the second air inlet pipe and used for conveying the air to the first air inlet pipe and the second air inlet pipe; and

and the purifier is arranged on the air inlet pipe and is used for purifying the air flowing into the air inlet pipe.

8. The system of any of claims 1-7, further comprising:

the control unit is connected with at least the reference system and the measuring system and is used for determining the emission amount of the particulate matters in the measuring sample gas according to the detection results of the reference system and the measuring system;

preferably, the system further comprises:

the gas flowmeter is arranged on the tail gas discharge pipeline and used for detecting the tail gas discharge flow in the tail gas discharge pipeline; and

the control unit is further connected with the gas flowmeter and used for determining the emission amount of the particulate matters in the tail gas at least according to the emission flow of the tail gas and the emission amount of the particulate matters in the measurement sample gas.

9. The system of any of claims 1-8, further comprising:

a gas discharge manifold connected to the reference system and the measurement system and adapted to receive gas discharged from the reference system and the measurement system; and

a gas extraction device disposed on the exhaust manifold and configured to provide motive force for gas flow within the system.

10. A method for detecting the amount of particulate matter emitted from exhaust gas using the system according to any one of claims 1 to 9, comprising:

the method comprises the following steps that a sampling main pipe in a sampling device is used for sucking tail gas in a tail gas discharge pipeline, and a first sampling branch pipe and a second sampling branch pipe which are connected with the sampling main pipe are used for distributing sucked tail gas sample gas to a reference system and a measuring system;

the method comprises the following steps of trapping particulate matters in a reference sample gas flowing through a reference system by using a particulate matter trapping device in the reference system, and treating and detecting other components except the particulate matters in the reference sample gas by using a first reaction device in the reference system;

processing and detecting the measurement sample gas flowing through the measurement system by using a second reaction device in the measurement system; and

and determining the emission of the particulate matters in the measurement sample gas according to the detection results of the reference system and the measurement system.

Images