CN111760424A

CN111760424A - A dry filtration system admits air for miniature air monitoring station

Info

Publication number: CN111760424A
Application number: CN202010643715.4A
Authority: CN
Inventors: 周清峰; 范智勇; 陈卓
Original assignee: Ai Gan Technology Guangdong Co ltd
Current assignee: Ai Gan Technology Guangdong Co ltd
Priority date: 2020-07-06
Filing date: 2020-07-06
Publication date: 2020-10-13

Abstract

The invention relates to an inlet air drying and filtering system for a micro air monitoring station, which comprises: the drying unit, it is before arranging the air detection unit in, dehumidifies the gas that gets into the air detection unit, and calculating equipment for it is in the warp to calculate target gas the humidity change volume before and after the drying unit is dry, the drying unit include at least two parallelly connected and with preceding arrange in the drying chamber that the gas circuit switching unit of drying unit all can communicate the calculating equipment with it based on the switching instruction that the humidity change volume generated sends to under the condition of gas circuit switching unit, gas circuit switching unit can be with the measuring target gas is from the leading-in another drying chamber of one of them drying chamber.

Description

A dry filtration system admits air for miniature air monitoring station

Technical Field

The invention relates to the technical field of air monitoring, in particular to an air inlet drying and filtering system for a micro air monitoring station.

Background

The atmosphere gridding monitoring technology is a development trend in the field of environment monitoring and atmospheric pollution early warning in a new era. Atmospheric grid monitoring is complementary to current municipal monitoring stations and has the special feature of wide coverage. The atmospheric gridding monitoring is that a plurality of micro air monitoring stations are arranged in a certain area, and then each micro air monitoring station uploads the monitored concentration of atmospheric pollutants to an atmospheric monitoring center in a signal mode so that the atmospheric monitoring center can output the atmospheric pollution condition in the area. Because many sensors of different gases are arranged in the micro air monitoring station. In actual operation, the gas sensor is affected by humidity, so that the output is inaccurate. Therefore, how to make the humidity of the gas entering the sensor meet the measurement requirement is an urgent problem to be solved in the field.

For example, chinese patent publication No. CN102033033B discloses an apparatus for adjusting the humidity of an air stream of an air particulate concentration monitoring apparatus. The method is mainly used for detecting various particulate matters in atmospheric research. The device consists of a tubular structure (1), a hygrometer (2) with a humidity probe, a humidifying channel (3), a drying channel (4), a through channel (5), the hygrometer (2) with the humidity probe, a computer (6) and a power supply (7); the humidity of the collected air flow is detected, and the sample entering the air particulate matter concentration monitoring instrument is kept in a reasonable humidity range through humidification or drying means, so that the monitoring result of the air particulate matter concentration monitoring instrument is more real and reliable.

For miniature air monitoring stations, the gas is typically dried with a desiccant. For areas with high humidity, such as coastal areas, Sichuan basins and the like, the drying agent generally loses the drying function in about 3 days, and an air inlet drying system needs to be replaced. The number of miniature air monitoring stations typically used in an area is enormous, which undoubtedly increases the maintenance costs of the miniature monitoring stations.

Furthermore, on the one hand, due to the differences in understanding to the person skilled in the art; on the other hand, since the inventor has studied a lot of documents and patents when making the present invention, but the space is not limited to the details and contents listed in the above, however, the present invention is by no means free of the features of the prior art, but the present invention has been provided with all the features of the prior art, and the applicant reserves the right to increase the related prior art in the background.

Disclosure of Invention

An air inlet drying and filtering system adopted in the existing micro air station is usually composed of a dust filter screen and a drying agent. In actual use, particularly in the area of the coast of the Guangdong, the desiccant often fails within three to five days due to high humidity. And because the gas sensor is calibrated under fixed humidity, if the drying agent loses efficacy, the gas humidity flowing to the sensor fluctuates, so that the output of the gas sensor is inaccurate, and the problem can be solved only by replacing the drying agent on site. And the air inlet system which needs to be replaced in three to five days obviously brings huge pressure to the maintenance of the gridding equipment.

Aiming at the defects of the prior art, the invention provides an inlet air drying and filtering system for a micro air monitoring station. The filtering system comprises a drying unit, a calculating unit and a gas path switching unit. The filtration system may also include a filtration unit. The filtering unit is arranged in front of the air detection unit and is used for filtering gas entering the air detection unit, particularly filtering large-particle dust. And the drying unit is arranged in front of the air detection unit and is used for dehumidifying the gas entering the air detection unit. And the calculating equipment is used for calculating the humidity change quantity of the target gas before and after the target gas is dried by the drying unit. Namely: the humidity of the target gas before drying is recorded before the target gas enters the drying unit, then the humidity of the target gas after drying is recorded after the target gas enters the drying unit, and then the variation of the humidity of the target gas is calculated by the calculating device.

In the invention, the drying unit comprises a plurality of drying chambers connected in parallel. A drying agent is placed in the drying chamber. Each drying chamber can be conducted with the air path switching unit. The computing device can shut down an operating drying chamber based on the amount of humidity change to introduce the target gas from the operating drying chamber into another not-yet-operating drying chamber. For example, the variation of the humidity before drying and the humidity after drying is approximately equal to 0, which proves that the drying chamber in operation loses the dehumidification function, that is, when the drying agent gradually loses efficacy, the computing device starts the air path switching device, switches the air path to enable the air to pass through another drying chamber, and effectively removes the humidity. The air inlet drying and filtering system can keep the air flowing into the sensor air cavity at a stable humidity and keep the sensor head clean; meanwhile, due to the multi-path switchable design, the maintenance frequency can be reduced, the gridding atmosphere monitoring is facilitated, and the long-term and stable control of humidity and dust interference can be realized.

According to a preferred embodiment, replaceable drying cartridges are arranged in the at least two drying chambers. The desiccant core may be comprised of a desiccant. The desiccant gradually loses its dehumidifying function after absorbing water, and thus needs to be replaced. However, when the desiccant is replaced has an impact on the maintenance of the micro air station of the gridding arrangement as well as on the detection accuracy. Frequent replacement is beneficial to detection precision but high maintenance cost and more manpower is invested; the infrequent replacement is detrimental to the detection accuracy. Therefore, the replacement of the desiccant is a difficult point for gridding the air detection. Even if many drying chambers are arranged in the micro inspection station, the drying agent needs to be replaced. The more drying chambers are arranged, the larger the micro-detection workstation occupies, the more space is occupied, and the installation is not facilitated. Therefore, the number of the arranged drying chambers can be determined according to the size of the air detection area. Namely: the number of the micro detection workstations is determined according to the input number. Thus, the drying unit has a drying cycle, i.e. the time between two adjacent changes of drying agent. The drying cycle is related to the number of drying chambers. In one drying cycle, the gas circuit switching unit needs to switch N times (N drying chambers). Therefore, in a drying cycle, the computing device can send a replacement instruction for replacing the drying core to the cloud server in the monitoring center when the switching frequency of the gas circuit switching unit reaches a preset frequency. Namely: in a drying period, when the gas circuit switching unit is switched for M times (M is less than or equal to N), the computing equipment sends a replacement instruction for replacing the drying core to a cloud server located in the monitoring center. Preferably, the preset number M may be determined according to the area size of the monitoring area, so that the micro air monitoring station can continuously operate without being interrupted by replacing the desiccant.

According to a preferred embodiment, the drying cycle can be redefined by the cloud server and transmitted back to the computing device based on the humidity characteristic of the target gas. The arrangement of a plurality of drying chambers can effectively reduce the replacement frequency of the drying agent. However, the desiccant in each drying chamber is operated at different target gas humidity (e.g., cloudy, rainy, sunny, etc.), the operation time of each drying chamber is different, and the operation life of the drying unit varies with the target gas. Therefore, the drying period can be defined by the cloud server based on the humidity of the target gas, the longer the drying period is, the less frequent the desiccant is replaced, and the replacement frequency of the desiccant is related to the change of the humidity of the target gas (namely, the humidity change of the ambient atmosphere), so that the intelligent management of the desiccant is facilitated.

According to a preferred embodiment, the computing device sends a switching instruction to the air path switching unit in such a way that the humidity of the target gas after being dried by the drying chamber can be within a preset range of the air monitoring unit. The air monitoring unit needs to work within a certain humidity range, which is beneficial to cleaning the sensor. Therefore, the gas passing through the drying chamber needs to be in a certain humidity range.

According to a preferred embodiment, the computing device is capable of acquiring humidity values of the target gas before and after drying by the drying unit, and sending the humidity values to the cloud server in a manner corresponding to detection values of the air detection unit, so that the cloud server can generate an air detection model of the humidity values and the detection values. The air monitoring model facilitates calibration of the measurements. Under different humidity environments, the amount by which the detected value deviates from its true value is different. In a drying period, the humidity of the dried target gas is related to the working time of the drying agent, the longer the working time of the drying agent is, the larger the humidity of the target gas is, therefore, the deviation of the detection values from the true values in the working process of the drying agent is different, and in order to obtain accurate detection values, the cloud server can generate an air detection model by using a deep learning algorithm or a laboratory calibration mode and the like based on the humidity value and the detection values so as to improve the measurement precision.

According to a preferred embodiment, the drying and filtering system comprises a filter unit, which is disposed upstream of the air detection unit and which contains a replaceable filter insert. The filter element can be filter cotton or filter paper. The filter element belongs to a consumable part, and the filtering capacity of the filter element also influences the measuring accuracy of the air detection unit. Thus, the filter cartridge is also configured as a component that needs to be replaced, requiring replacement thereof. However, the cleanliness of the filter cartridge is difficult to measure, and the maintenance of the filter cartridge is also difficult for a grid-arranged micro air monitoring station. To this end, the present invention correlates the frequency of filter cartridge replacement with the frequency of desiccant replacement. That is, the dry life of the desiccant and the filter life of the cartridge can be correlated by means of big data to reduce the difficulty of cartridge maintenance. Wherein the filter element has a filter period, the filter period and the drying period being interrelated with each other via the cloud server. For example, when the desiccant is replaced, the filter element is also replaced.

According to a preferred embodiment, the invention discloses a computing device of a drying system for a micro air monitoring station, which comprises a memory and a processor, wherein the memory is used for storing a humidity change threshold value, the processor is used for calculating the humidity change of target gas before and after drying of a drying unit, and in the case that the change is within the change threshold value, the processor can generate a switching instruction so that an air path switching unit can lead air into a drying chamber which is not operated yet and cut off the air from entering the operating drying chamber.

According to a preferred embodiment, the computing device is capable of being communicatively connected to a cloud server located in a monitoring center.

According to a preferred embodiment, the present invention discloses a dry filtration method for meshed atmospheric monitoring, comprising: the drying unit dehumidifies target gas entering the air detection unit, the computing equipment calculates humidity variation of the target gas before and after drying by the drying unit, and the drying unit is provided with at least two drying chambers which are connected in parallel and can be communicated with a gas path switching unit arranged in front of the drying unit; the computing device is configured to: and a switching instruction generated based on the humidity variation is sent to the air path switching unit, so that the air path switching unit can guide the target gas to be measured from one drying chamber to the other drying chamber based on the switching instruction.

According to a preferred embodiment, in the dry-filtering method, the at least two drying chambers are configured with replaceable drying cartridges, and the computing device is configured to: and in a drying period and under the condition that the switching times of the gas circuit switching unit reach preset times, sending a replacement instruction for replacing the drying core to a cloud server positioned in a monitoring center.

Drawings

FIG. 1 is a schematic block diagram of a drying and filtering system according to the present invention;

FIG. 2 is a schematic diagram of a drying chamber according to the present invention; and

FIG. 3 is a schematic illustration of the reuse of a desiccant according to the present invention.

List of reference numerals

100: the filter unit 700: membrane filtration device

200: the drying unit 800: air pump

300: air detection unit 900: cloud server

400: computing device 200 a: drying chamber

500: gas path switching unit 600 a: first humidity sensor

600 b: second humidity sensor

Detailed Description

This is described in detail below with reference to figures 1 and 2.

Example 1

As shown in fig. 1, the present embodiment discloses a filtering and drying system for a micro air station. The drying and filtering system includes a drying unit 200, a computing device 400, and a gas path switching unit 500. Preferably, the dry filtration system may further include a filter unit 100.

The filter unit 100 has filter cotton and/or filter paper for filtering and adsorbing large particle dust. The drying unit 200 includes a plurality of drying chambers 200a connected in parallel. Each drying chamber has a desiccant for dehumidifying the target gas. The filtering unit 100 and the drying unit 200 are disposed before the air detecting unit 300. Namely: under the action of the air pump 800, the target gas enters the air detection unit 300 after being filtered and dried. Preferably, the target gas is filtered through the filtering unit 100 and then passes through the drying unit 200. Preferably, the target gas passes through the membrane filtration device 700 after passing through the drying unit 200. The inside of the membrane filtration device 700 is a PTFE membrane, which realizes the further filtration of the small-particle dust and the residual moisture.

As shown in fig. 1, before the target gas enters the drying unit 200, the first humidity sensor 600a measures the humidity of the target gas before drying. After the target gas is dried by the drying unit 200, the second humidity sensor 600b measures the humidity of the target gas after drying. Preferably, the first humidity sensor 600a may be disposed at a front pipe of the filtering unit 100, and may be disposed at a pipe between the filtering unit 100 and the drying unit 200. Preferably, the second humidity sensor 600b may be disposed in a pipe between the drying unit 200 and the membrane filtration device 700, and may also be disposed in a pipe between the membrane filtration device 700 and the air detection unit 300. The humidity measured by the first humidity sensor 600a and the second humidity sensor 600b is transmitted to the computing device 400 by a signal. The calculation device 400 calculates the amount of change in humidity.

The drying chamber 200a can be communicated with the air path switching unit 500. The air path switching unit 500 may be a solenoid valve. The computing device 400 can shut down an operating drying chamber based on the amount of humidity change to introduce the target gas from the operating drying chamber into another drying chamber that is not already operating. For example, the variation of the humidity before drying and the humidity after drying is approximately equal to 0, which proves that the drying chamber in operation loses the dehumidification function, that is, when the drying agent gradually loses efficacy, the computing device starts the air path switching device, switches the air path to enable the air to pass through another drying chamber, and effectively removes the humidity. The air inlet drying and filtering system can keep the air flowing into the sensor air cavity at a stable humidity and keep the sensor head clean; meanwhile, due to the multi-path switchable design, the maintenance frequency can be reduced, the gridding atmosphere monitoring is facilitated, and the long-term and stable control of humidity and dust interference can be realized.

Preferably, at least two drying chambers 200a are provided with replaceable drying cartridges therein. As shown in fig. 2, the drying unit 200 has N (N is 2 or more) drying chambers in total. The drying time of each drying chamber (1, 2 … …, n-1, n) is t_1、t_2、……t-1、t_n。t_1、t_2、……t-1、t_nThe sum of which is one drying cycle. The switching frequency of the air path switching unit 500 is recorded as M. During a drying cycle, if M reaches a preset number of times, the computing device 400 can send a replacement instruction for replacing the drying core to the cloud server 900 located at the monitoring center. Typically, the predetermined number of times is less than or equal to N. Preferably, the predetermined number of times is less than or equal to N-1. That is, when a drying chamber is left unused in the drying unit 200, the computing device 400 sends a replacement instruction to the cloud server 900 to prompt the monitoring center to replace the drying agent without investing too much human resources. Preferably, the cloud server 900 and the computing device 400 may be connected through a wireless network.

Preferably, the drying cycle can be redefined by the cloud server 900 and transmitted back to the computing device 400 based on the humidity characteristic of the target gas. The humidity characteristic value of the target gas may be an absolute value of humidity or a change value of humidity over a certain period of time. The humidity characteristic value may be obtained by the cloud server 900 from a weather service center. The drying period is defined to be beneficial to fully balancing the relation between drying and maintenance of the drying agent, so that the maintenance efficiency can be effectively improved and the maintenance cost can be reduced under the condition of ensuring the humidity of the target gas entering the air monitoring unit 300, and therefore the micro air monitoring station which is arranged in a gridding mode can monitor the atmosphere in the area with low cost, high efficiency and high accuracy.

Preferably, the humidity value of the dried target gas passing through the drying chamber 200 needs to satisfy a certain humidity environment, so that the sensor in the air detection unit 300 can be cleaned by the target gas, which is beneficial to improving the sensitivity of the sensor. Therefore, the computing apparatus 400 generates a switching instruction to cause the air path switching unit 500 to switch the next drying chamber 200a to meet the humidity requirement if the humidity of the target gas after being dried by the drying chamber 200a is not within the preset range of the air monitoring unit 300.

Preferably, the calculation apparatus 400 can acquire a humidity value of the target gas before and after being dried by the drying unit 200. The computing apparatus 400 transmits it to the cloud server 900 in such a manner that the detection values of the air detection unit 300 correspond to each other. The cloud server 900 can generate the air detection model by a deep learning method or a laboratory calibration method based on the humidity value and the detection value. The air detection model may be used to correct the detection values to improve system accuracy.

Preferably, the dry filtration system includes a filtration unit 100. The filter unit 100 is placed in front of the air detection unit 300. The filter unit 100 contains a replaceable filter element. Wherein the filter element has a filter period. The filtering cycle and the drying cycle are correlated with each other via the cloud server 900. The filtering period and the drying period may be associated via the cloud server 900 using a deep learning algorithm or a laboratory calibration.

Example 2

This embodiment may be a further improvement and/or a supplement to embodiment 1, and repeated contents are not described again. The preferred embodiments of the present invention are described in whole and/or in part in the context of other embodiments, which can supplement the present embodiment, without resulting in conflict or inconsistency.

The present embodiment discloses a computing device 400, and in particular a computing device 400 for a drying system of a micro air monitoring station. The computing device 400 includes a memory and a processor. The memory is used for storing the humidity change amount threshold value. The processor is used for calculating the humidity change amount of the target gas before and after drying in the drying unit 200. And in the case that the variation is within the variation threshold, the processor can generate a switching instruction to enable the gas circuit switching unit 500 to introduce the gas into the drying chamber that is not yet operated and to cut off the gas from entering the drying chamber that is being operated.

Preferably, the computing device 400 is capable of communicative connection with a cloud server 900 located at a monitoring center.

Example 3

This embodiment may be a further improvement and/or a supplement to

embodiments

1, 2 or a combination thereof, and repeated contents are not described again. This example discloses that, without causing conflict or contradiction, the whole and/or partial contents of the preferred embodiments of other examples can be supplemented by this example.

The present embodiment discloses a preferred method of using a drying chamber. In the actual operation process, the humidity of the drying agent can follow the service time t of the corresponding drying chamber_nThe humidity of the air entering the air detection unit 300 changes in the period of time, which results in that, on one hand, the parameters of the air detection unit 300 need to be reconfigured when switching to the next drying chamber, and the configuration control function of the air detection unit 300 by the computing device 400 needs to be added; on the other hand, the lifetime of the desiccant is reduced. To this end, the present embodiment discloses a preferred method of using a drying chamber: and returning the detected air to the drying chamber, and drying the drying agent for the second time. The specific steps can be combined as shown in fig. 3:

1. the air to be detected is dried in such a manner that the amount of change in the humidity of the desiccant in the drying chamber after one service time is minimized. By minimizing is meant: the desiccant can be used for drying or approximately drying the air to be monitored after the air to be monitored is dehumidified and detected. Specific examples thereof are: one service time per drying chamber is reduced. For example, the drying unit 300 is provided with 8 drying chambers in total, and the drying cycle is 3 days, that is, each drying chamber has a service time of 9 hours (the service time is 9 hours, and thus the drying chamber needs to be replaced); in this embodiment, the service time of each drying chamber is 3 hours, and after the service time is 3 hours, the drying chamber can be switched to the next drying chamber, and the drying agent can be dried by the detected air returning mode during the non-service time, so as to increase the service time (according to this mode, the service time can be increased to about 1 time). The difference of the change of the humidity of the drying agent in the drying chamber after one-time service time is reduced, and the drying is dried by detected air. Preferably, the change amount of the humidity of the drying agent in the drying chamber after one service time is controlled to be about 20-40%. Therefore, the temperature of the molten metal is controlled,

2. during the service process of the (n-1) th drying chamber, the detected air is returned to the (n) th drying chamber. As shown in fig. 3, during the service process of the 2 nd drying chamber, the dried gas is detected by the air detection unit 300 and then returned to the 3 rd drying chamber (the next drying chamber) for drying the drying agent therein. According to the mode, on one hand, the drying agent can be reused, the service life of the drying agent is prolonged, and the replacement frequency and the maintenance frequency are reduced; on the other hand, the humidity fluctuation of the air to be detected entering the air detecting unit 300 becomes small, so that the influence of the large humidity gradient of the air entering the air detecting unit 300 after each switching on the sensitivity of the air detecting unit 300 is avoided or substantially avoided, that is, the embodiment can make the humidity of the air entering the air detecting unit 300 fluctuate within a narrow range, so that the air detecting unit 300 can quickly and quickly measure the air quality without parameter configuration or parameter configuration frequency reduction.

Example 4

This embodiment may be a further improvement and/or a supplement to

embodiments

1, 2, and 3 or a combination thereof, and repeated details are not repeated. This example discloses that, without causing conflict or contradiction, the whole and/or partial contents of the preferred embodiments of other examples can be supplemented by this example.

The embodiment also discloses a drying and filtering method, in particular to a drying and filtering method for gridding atmosphere monitoring, which comprises the following steps:

s1: the drying unit 200 dehumidifies the target gas entering the air detection unit 300,

s2: the calculation apparatus 400 calculates the amount of humidity change of the target gas before and after being dried by the drying unit 200.

Preferably, S11: the drying unit 200 is provided with at least two drying chambers 200a connected in parallel and capable of communicating with the air passage switching unit 500 disposed in front of the drying unit 200.

S21: the computing device 400 is configured to: a switching instruction generated based on the humidity change amount is sent to the air path switching unit 500, so that the air path switching unit 500 can introduce the target gas to be measured from one of the drying chambers to the other drying chamber based on the switching instruction.

Preferably, a preferred embodiment of the method is:

under the action of an air pump, firstly, monitoring the temperature and humidity of the ambient air through the front end, and recording the temperature and humidity of the air before drying and filtering; then, filtering large-particle dust through filter cotton and filter paper; under the action of the air path switching unit, air enters a certain path of drying agent to realize the filtration of humidity; then, the small-particle dust and residual moisture are further filtered through a PTFE film; then, recording the temperature and the humidity of the dried and filtered gas through rear-end temperature and humidity monitoring; and finally, the gas enters a sensor gas cavity, and after the sensor detects the target gas, the gas is discharged back to the atmosphere.

Humidity data that rear end humiture was monitored will compare with the data of front end humiture monitoring, and when finding that the two data is close, when the drier became invalid gradually promptly, can start gas circuit switching unit, make gaseous new drier through the switching of gas circuit, realize the effective filtration to humidity. In the system, the filter cotton, the filter paper, the drying agent and the PTFE film can be replaced regularly. The air inlet drying and filtering system can keep the air flowing into the sensor air cavity at a stable humidity and keep the sensor head clean; meanwhile, due to the multi-path switchable design, the maintenance frequency can be reduced, and long-term and stable control of humidity and dust interference is realized.

It should be noted that the above-mentioned embodiments are exemplary, and that those skilled in the art, having benefit of the present disclosure, may devise various arrangements that are within the scope of the present disclosure and that fall within the scope of the invention. It should be understood by those skilled in the art that the present specification and figures are illustrative only and are not limiting upon the claims. The scope of the invention is defined by the claims and their equivalents.

Claims

1. An inlet air dry filter system for a micro air monitoring station, comprising:

a drying unit (200) disposed in front of the air detection unit (300) for dehumidifying the target gas entering the air detection unit (300), and

a calculation device (400) for calculating a humidity change amount of the target gas before and after drying by the drying unit (200),

it is characterized in that the preparation method is characterized in that,

the drying unit (200) comprises at least two drying chambers (200a) which are connected in parallel and can be communicated with an air path switching unit (500) arranged in front of the drying unit (200), and under the condition that the computing equipment (400) sends a switching instruction generated based on the humidity change amount to the air path switching unit (500), the air path switching unit (500) can guide the target gas to be measured from one drying chamber into the other drying chamber.

2. Drying and filtering system according to claim 1, characterised in that replaceable drying cartridges are arranged in the at least two drying chambers (200a),

in a drying period, the computing device (400) can send a replacement instruction for replacing the drying core to a cloud server (900) in the monitoring center when the switching frequency of the gas circuit switching unit (500) reaches a preset frequency.

3. The drying and filtering system according to claim 1 or 2, wherein the drying cycle is redefinable by the cloud server (900) and transmitted back to the computing device (400) based on the humidity characteristic of the target gas.

4. Drying and filtering system according to one of the preceding claims, characterized in that the computing device (400) sends a switching instruction to the air circuit switching unit (500) in such a way that the humidity of the target gas after drying via the drying chamber (200a) can be within a preset range of the air monitoring unit (300).

5. Drying and filtering system according to one of the preceding claims, wherein the computing device (400) is capable of acquiring humidity values of the target gas before and after drying by the drying unit (200) and sending them to the cloud server (900) in a manner corresponding to the detection values of the air detection unit (300) for the cloud server (900) to be able to generate an air detection model of humidity values and detection values.

6. Drying and filtering system according to one of the preceding claims, characterized in that it comprises a filter unit (100), said filter unit (100) being preceded by said air detection unit (300), said filter unit (100) containing a replaceable filter cartridge,

wherein the filter element has a filter period, the filter period and the drying period being interrelated with each other via the cloud server (900).

7. A computing device (400) for a drying system of a micro air monitoring station, comprising a memory and a processor, characterized in that,

the memory is used for storing a humidity change amount threshold value,

the processor is used for calculating the humidity change amount of the target gas before and after drying of the drying unit (200), and in the case that the change amount is within the change amount threshold value, the processor can generate a switching instruction, so that the gas path switching unit (500) can introduce gas into the drying chamber which is not operated yet and cut off the gas from entering the drying chamber which is operated.

8. The computing device (400) of claim 8, wherein the computing device (400) is communicatively connectable to a cloud server (900) located at a monitoring center.

9. A dry filtration method for meshed atmospheric monitoring, comprising:

the drying unit (200) dehumidifies the target gas entering the air detection unit (300),

the calculation device (400) calculates the amount of humidity change of the target gas before and after drying by the drying unit (200),

characterized in that the method further comprises:

the drying unit (200) is provided with at least two drying chambers (200a) which are connected in parallel and can be communicated with the gas path switching unit (500) arranged in front of the drying unit (200)

The computing device (400) is configured to: and a switching instruction generated based on the humidity change amount is sent to the air path switching unit (500), so that the air path switching unit (500) can guide the target gas to be measured from one drying chamber to the other drying chamber based on the switching instruction.

10. Drying and filtering method according to claim 9, characterised in that said at least two drying chambers (200a) are provided with replaceable drying cartridges,

and, the computing device (400) is configured to: in a drying cycle and under the condition that the switching frequency of the gas circuit switching unit (500) reaches a preset frequency, a replacement instruction for replacing the drying core can be sent to a cloud server (900) located in a monitoring center.