Sampling and drying device for particulate matter concentration monitoring

Abstract

The utility model relates to a sampling and drying device for monitoring the concentration of particulate matters. The device comprises a dryer cavity and a channel arranged in the dryer cavity, a sample inlet and a sampling port are respectively formed in two ends of the channel; the dryer cavity is filled with a drying agent, and the drying agent wraps the periphery of the channel. And a drying agent inlet pipe and a drying agent discharge pipe are respectively arranged on the periphery of the middle section of the dryer cavity. Physical and chemical methods are combined, efficient drying materials and technologies are adopted, moisture in sample gas can be rapidly adsorbed and removed in the sampling process, meanwhile, the original form and concentration of particulate matter are kept, and the authenticity and accuracy of monitoring data are ensured. The device also has the advantages of compact structure, simplicity and convenience in operation, low maintenance cost and the like, and is suitable for monitoring the number and concentration of particulate matters under various environmental conditions.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental monitoring, in particular to a sampling and drying device for monitoring particle concentration. Background Art

[0002] Existing particulate matter monitoring equipment often suffers from data deviations during the sampling process due to the influence of moisture in the sample gas, affecting the accuracy and reliability of the monitoring results. Overseas, some developed countries have developed relatively advanced particulate matter monitoring technologies and equipment that can, to a certain extent, reduce the impact of moisture on monitoring results. For example, the US Environmental Protection Agency (EPA) and the European Environment Agency (EEA) use advanced sensors and algorithms to correct for the effect of moisture on particle number concentrations. However, these technologies and equipment are costly and still have certain limitations in some cases. Utility Model Content

[0003] In order to solve the data deviation and misjudgment caused by moisture in the sample gas in the existing particulate matter monitoring process, the utility model provides a sampling and drying device for particulate matter concentration monitoring. The device improves the accuracy and reliability of particle number concentration monitoring by efficiently removing moisture from the sample gas, providing an efficient and reliable solution for the field of environmental monitoring.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A sampling and drying device for monitoring particulate matter concentration, comprising a dryer cavity and a channel arranged in the dryer cavity; an inlet and a sampling port are respectively provided at both ends of the channel; the dryer cavity is filled with a desiccant, and the desiccant is wrapped around the periphery of the channel; a desiccant inlet pipe and a desiccant outlet pipe are respectively provided on the periphery of the middle section of the dryer cavity.

[0006] Preferably, according to the present invention, the dryer cavity, the channel, the injection port and the sampling port are coaxially arranged; and the channel adopts a tubular steel wire mesh.

[0007] Preferably, according to the present invention, a desiccant inlet plug is provided at the port of the desiccant inlet pipe; the desiccant inlet plug is threadedly installed at the port of the desiccant inlet pipe.

[0008] Preferably, according to the present invention, a desiccant outlet plug is provided at the port of the desiccant discharge pipe; the desiccant outlet plug is threadedly installed at the port of the desiccant discharge pipe.

[0009] According to the preferred embodiment of the present invention, the desiccant inlet pipe and the desiccant discharge pipe are respectively threadedly connected to the outer periphery of the middle section of the dryer cavity.

[0010] According to the preferred embodiment of the present invention, the desiccant is made of silica gel.

[0011] Preferably, according to the present invention, a sensor installation port is provided on the dryer cavity; the sensor installation port is communicated with the sampling port; and a temperature and humidity sensor is installed in the sensor installation port.

[0012] According to the preferred embodiment of the present invention, the dryer cavity is made of transparent acrylic material.

[0013] According to the preferred embodiment of the present invention, a desiccant filling area is provided inside the dryer cavity.

[0014] According to the preferred embodiment of the present invention, the end surfaces at the upper and lower ends of the dryer cavity are both funnel-shaped.

[0015] Compared with the prior art, the advantages of the present invention are:

[0016] The sampling and drying device for monitoring the number concentration of particulate matter described in the utility model not only solves the problem that traditional monitors are difficult to remove moisture during the sampling process, but also improves the monitoring accuracy and stability of particulate matter monitoring, and has significant technical innovation and practical value. With the increasing awareness of environmental protection and the continuous increase in monitoring needs, the device has broad application prospects and market space in the field of environmental monitoring. The utility model combines physical and chemical methods and adopts high-efficiency drying materials and technologies. It can quickly adsorb and remove moisture from the sample gas during the sampling process, while maintaining the original form and concentration of the particulate matter, ensuring the authenticity and accuracy of the monitoring data. The utility model realizes the effective removal of moisture from the sampled gas, improves the accuracy of the particle number concentration monitoring and the stability of the particle monitoring process. In addition, the device also has the advantages of compact structure, easy operation, low maintenance cost, etc., and is suitable for monitoring the number concentration of particulate matter under various environmental conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the sampling and drying device described in the utility model;

[0018] Figure 2 It is a structural schematic diagram of the sampling and drying device described in the utility model installed inside a particle number concentration monitor.

[0019] in:

[0020] 1. Desiccant outlet plug, 2. Desiccant discharge pipe, 3. Dryer cavity, 4. Sampling port, 5. Sensor mounting port, 6. Channel, 7. Desiccant inlet plug, 8. Desiccant inlet pipe, 9. Sampling port, 10. Desiccant, 11. Casing of particle number concentration monitor, 12. Particle number concentration measuring device, 13. Sampling and drying device for particle concentration monitoring, 14. Sampling port of particle number concentration monitor. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the accompanying drawings:

[0022] like Figure 1 and Figure 2 A sampling and drying device for monitoring particulate matter concentration is shown, which includes a dryer cavity 3 and a channel 6 arranged in the dryer cavity 3; an inlet 9 and a sampling port 4 are respectively provided at both ends of the channel; the dryer cavity 3 is filled with a desiccant 10, and the desiccant 10 is wrapped around the outer periphery of the channel 6; a desiccant inlet pipe 8 and a desiccant outlet pipe 2 are respectively provided on the outer periphery of the middle section of the dryer cavity 3.

[0023] The sampling and drying device for particulate matter concentration monitoring described in this utility model uses a desiccant to remove moisture from the sample, thereby ensuring the accuracy of the particle concentration measurement during subsequent analysis. This design effectively reduces the impact of moisture on measurement results. The dryer chamber 3, the main body of the device, is made of transparent acrylic and can accommodate a certain amount of desiccant while providing ample space for the sample gas to pass through. Channel 6 is a path within the dryer chamber that guides the sample gas to be measured from the inlet to the sampling port. The design of this channel should minimize direct contact with the desiccant to prevent sample contamination, while ensuring sufficient surface area for moisture to be absorbed by the surrounding desiccant. The inlet 9 is where the sample gas enters the system. A large-particle cutter or other pretreatment component can be installed here to prevent large particles or contaminants from entering the device. The dried sample gas is discharged from the sampling port 4 and then sent to the particle analyzer for further testing. Desiccant 10 is placed within the dryer chamber 3 and distributed around channel 6. Its primary function is to absorb moisture carried by the sample gas as it passes through the channel. Desiccant inlet pipe 8 and desiccant outlet pipe 2 allow for convenient desiccant addition and replacement. When the desiccant becomes saturated with water, it can be removed through the outlet pipe and replaced with a new one, ensuring continued system effectiveness. This design helps improve the accuracy and reliability of particulate matter concentration monitoring, which is particularly important in high-humidity environments.

[0024] like Figure 2As shown, the sampling and drying device 13 for monitoring the concentration of particulate matter can be installed in an existing particulate matter number concentration monitor for use. Figure 2 In the embodiment, the sampling and drying device 13 is located inside the housing 11 of the particle number concentration monitor. The sampling port 9 serves as the sampling port 14 of the particle number concentration monitor. The sampling port 4 is connected to the particle number concentration measurement device 12 in the prior art. The desiccant inlet pipe 8 and the desiccant outlet pipe 2 are connected to the outside of the particle number concentration monitor for replacing the desiccant.

[0025] According to the preferred embodiment of the present invention, the dryer cavity 3, the channel 6, the sample inlet 9, and the sampling port 4 are all coaxially arranged, which can effectively reduce the loss of particulate matter sampling caused by the internal piping of the drying device. The channel 6 is made of tubular 316 steel mesh. 316 steel, due to its stable chemical properties, does not cause any interference with the sampled gas in direct contact. The high-porosity mesh tube design not only minimizes direct contact with the desiccant to avoid contamination of the sample, but also ensures sufficient surface area for water vapor to be absorbed by the surrounding desiccant.

[0026] According to the preferred embodiment of the present invention, the desiccant inlet pipe 8 and the desiccant outlet pipe 2 are respectively threadedly connected to the outer periphery of the middle section of the dryer cavity 3. A desiccant inlet plug 7 is provided at the port of the desiccant inlet pipe 8; the desiccant inlet plug 7 is threadedly installed at the port of the desiccant inlet pipe 8. A desiccant outlet plug 1 is provided at the port of the desiccant outlet pipe 2; the desiccant outlet plug 1 is threadedly installed at the port of the desiccant outlet pipe 2. The desiccant 10 can be added to the dryer cavity through the desiccant inlet pipe and can be discharged through the desiccant outlet pipe after failure. A desiccant filling area is provided inside the dryer cavity 3, and the end faces of the upper and lower ends thereof are both funnel-shaped. This design not only causes the desiccant to be mainly concentrated around the channel 6, thereby significantly improving the utilization efficiency of the desiccant, but also greatly facilitates the replacement operation of the desiccant, ensuring that the failed desiccant can be completely discharged without residue.

[0027] According to the preferred embodiment of the present invention, the desiccant 10 is made of silica gel. The desiccant 10 is a high-efficiency drying material made of silica gel, which has an extremely fine pore network structure inside. These capillaries can absorb moisture and retain the moisture through their physical attraction. Therefore, the silica gel desiccant has excellent hygroscopic properties and can effectively absorb more than 30% of its own weight in moisture. Its chemical properties are stable, non-toxic, odorless, non-corrosive and non-polluting, which can prevent it from affecting the sampled gas. After the desiccant loses its effectiveness, its color will change from orange to blue, and it can be restored by heating and can be reused.

[0028] According to the preferred embodiment of the present invention, the dryer cavity 3 is provided with a sensor mounting port 5, which is connected to the sampling port 4. A temperature and humidity sensor is installed in the sensor mounting port 5. Real-time monitoring of the temperature and humidity at the sampling port can more accurately reflect the actual state of the sampled gas after passing through the device.

[0029] According to the preferred embodiment of the present invention, the dryer cavity 3 is made of transparent acrylic material. Since the color of the desiccant will change from orange to blue after it expires, the transparent material makes it easier to observe the color change of the desiccant when it expires.

[0030] The working process of the sampling and drying device for monitoring particulate matter concentration described in the utility model is as follows:

[0031] S1. Sample gas introduction

[0032] When the particle number concentration monitor is started, the sample gas is first introduced into the sampling drying device 13 through the sampling port 14 of the monitor.

[0033] S2, molecular level drying process

[0034] The sample gas then flows into channel 6 through the device's inlet 9. In channel 6, water molecules in the sample gas spontaneously migrate to the desiccant surface through intermolecular forces, without direct contact with the desiccant. The silica gel desiccant, with its microscopic pores, effectively absorbs and locks in this water, achieving efficient drying through a physical adsorption mechanism.

[0035] S3. Particle concentration measurement

[0036] The dried sample gas is then sent to the particle number concentration measuring device 12 for more accurate particle concentration measurement.

[0037] S4. Desiccant status monitoring and replacement

[0038] To ensure continuous and effective drying, desiccant expiration can be determined in two ways: by directly observing the desiccant's color change; or by using the temperature and humidity sensor to monitor data in real time. If the desiccant expires, it can be conveniently drained through the desiccant drain pipe 2 without disassembling the entire monitor. Fresh desiccant can then be quickly replenished through the desiccant inlet 8, ensuring continuous and accurate monitoring.

[0039] In summary, this utility model can effectively remove moisture from sampled gas, improving the accuracy and stability of particle number concentration monitoring. Furthermore, the device boasts a compact structure, simple operation, and low maintenance costs, making it suitable for monitoring particle number concentration in a variety of environmental conditions.

[0040] The above-described embodiments are merely descriptions of preferred implementation methods of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A sampling and drying device for monitoring particulate matter concentration, characterized in that: The device comprises a dryer cavity (3) and a channel (6) arranged in the dryer cavity (3); a sampling port (9) and a sampling port (4) are respectively provided at both ends of the channel; the dryer cavity (3) is filled with a desiccant (10), and the desiccant (10) is wrapped around the outer periphery of the channel (6); and a desiccant inlet pipe (8) and a desiccant outlet pipe (2) are respectively provided on the outer periphery of the middle section of the dryer cavity (3).

2. The sampling and drying device for monitoring particulate matter concentration according to claim 1, characterized in that: The dryer cavity (3), the channel (6), the injection port (9) and the sampling port (4) are all coaxially arranged; The passage (6) is made of a tubular steel wire mesh.

3. The sampling and drying device for monitoring particulate matter concentration according to claim 1, characterized in that: A desiccant inlet plug (7) is provided at the port of the desiccant inlet pipe (8); The desiccant inlet plug (7) is threadedly mounted at the port of the desiccant inlet pipe (8).

4. The sampling and drying device for monitoring particulate matter concentration according to claim 1, characterized in that: A desiccant outlet plug (1) is provided at the port of the desiccant discharge pipe (2); The desiccant outlet plug (1) is threadedly mounted at the port of the desiccant discharge pipe (2).

5. The sampling and drying device for monitoring particulate matter concentration according to claim 1, characterized in that: The desiccant inlet pipe (8) and the desiccant outlet pipe (2) are respectively threadedly connected to the outer periphery of the middle section of the dryer cavity (3).

6. The sampling and drying device for monitoring particulate matter concentration according to claim 1, characterized in that: The desiccant (10) is made of silica gel.

7. The sampling and drying device for monitoring particulate matter concentration according to claim 1, characterized in that: A sensor installation port (5) is provided on the dryer cavity (3); the sensor installation port (5) is connected to the sampling port (4); and a temperature and humidity sensor is installed in the sensor installation port (5).

8. The sampling and drying device for monitoring particulate matter concentration according to claim 1, characterized in that: The dryer cavity (3) is made of transparent acrylic material.

9. The sampling and drying device for monitoring particulate matter concentration according to claim 1, characterized in that: A desiccant filling area is provided inside the dryer cavity (3).

10. The sampling and drying device for monitoring particulate matter concentration according to claim 1, characterized in that: The end surfaces at the upper and lower ends of the dryer cavity (3) are both funnel-shaped.

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