CN111744336A

CN111744336A - Reusable air inlet drying and filtering system

Info

Publication number: CN111744336A
Application number: CN202010643714.XA
Authority: CN
Inventors: 周清峰; 陈卓; 范智勇
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: 2020-10-09

Abstract

The invention relates to a reusable air inlet drying and filtering system which is suitable for gridding atmosphere monitoring and comprises the following components: the dryer is configured to be provided with at least two drying chambers which are connected in parallel and can be communicated with the air quality sensing unit, wherein the drying chambers are all configured with heating units, and the heating units can be started after the drying gases in the corresponding drying chambers and in an idle state and are used for heating and dehumidifying the drying chambers. The system can effectively reduce the maintenance cost of the system and can effectively improve the monitoring precision and efficiency of the micro workstation.

Description

Reusable air inlet drying and filtering system

Technical Field

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

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, a hygrometer with a humidity probe, a humidifying channel, a drying channel, a through channel, the hygrometer with the humidity probe, a computer and a power supply; 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 a reusable air inlet drying and filtering system. The filtering system comprises a dryer, a calculating unit and an air path switching device. The filtration system may also include a filter. The filter is arranged in front of the air quality sensing unit and is used for filtering the air entering the air quality sensing unit, particularly filtering large-particle dust. A dryer disposed in front of the air quality sensing unit to dehumidify the air entering the air quality sensing unit. And the processor is used for calculating the humidity change quantity of the target gas before and after the target gas is dried by the dryer. 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 dryer, and then the change of the humidity of the target gas is calculated by the processor.

In the invention, the dryer 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 gas circuit switching device. The drying agent can be dehumidified by the heating unit, so that the effect of repeated recycling is achieved. The processor can introduce the target gas from the operating drying chamber into another drying chamber that is not yet operating based on the humidity change amount, and shut down the 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 processor starts the air path switching device, and switches the air path to enable the air to pass through another drying chamber, so as to effectively remove 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, the heating unit is capable of being activated in response to a heating instruction of the processor for heating and dehumidifying the drying chamber.

According to a preferred embodiment, the heating unit can be activated at least once during a drying cycle, so that the drying unit can dry the target gas repeatedly and continuously.

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 dryer has a drying cycle, i.e., two adjacent times to replace the desiccant. The drying cycle is related to the number of drying chambers. In one drying cycle, the gas path switching device needs to be switched for N times (N drying chambers). Therefore, in a drying cycle, the processor 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 device reaches a preset frequency. Namely: in a drying period, when the gas circuit switching device is switched for M times (M is less than or equal to N), the processor 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 processor 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 dryer 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 processor sends a switching instruction to the air path switching device 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 dry-filter system comprises a filter, which is disposed upstream of the air quality sensor 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 quality sensing 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 processor 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 dryer, 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 device can introduce gas into a drying chamber which is not operated yet and cut off the gas from entering the drying chamber which is operated.

According to a preferred embodiment, the processor is capable of being in communication connection with 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 method comprises the following steps that a dryer dehumidifies target gas entering an air quality sensing unit, a processor calculates humidity variation of the target gas before and after the target gas is dried by the dryer, and the dryer is provided with at least two drying chambers which are connected in parallel and can be communicated with a gas path switching device arranged in the dryer in front; the processor is configured to: and a switching instruction generated based on the humidity variation is sent to the air path switching device, so that the air path switching device 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 filtration method, the at least two drying chambers are provided with replaceable drying cartridges, and the processor is configured to: and in a drying period and under the condition that the switching times of the gas circuit switching device 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 preferred drying implementation of a drying chamber provided by the present invention; and

fig. 3 is a schematic diagram of a preferred heating implementation of a drying chamber provided by the present invention.

List of reference numerals

100: the filter 700: membrane filtration device

200: the dryer 800: air pump

300: air quality sensing unit 900: cloud server

400: the processor 200 a: drying chamber

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

600 b: second humidity sensor

Detailed Description

This is described in detail below with reference to fig. 1, 2 or 3.

Example 1

The embodiment discloses a reusable air inlet drying and filtering system which is suitable for gridding atmosphere monitoring. 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 dryer 200, a processor 400, and a gas path switching device 500. Preferably, the dry filtration system may further comprise a filter.

The filter has filter cotton and/or filter paper, which is used for filtering and adsorbing large-particle dust. The dryer 200 includes a plurality of drying chambers 200a connected in parallel. Each drying chamber has a desiccant for dehumidifying the target gas. The filter and the dryer 200 are disposed in front of the air quality sensing unit 300. Namely: under the action of the air pump 800, the target gas enters the air quality sensing unit 300 after being filtered and dried. Preferably, the target gas is filtered through a filter and then passes through the dryer 200. Preferably, the target gas passes through the membrane filtration device 700 after passing through the dryer 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 dryer 200, the first humidity sensor 600a measures the humidity of the target gas before drying. After the target gas is dried by the dryer 200, the second humidity sensor 600b measures the humidity of the target gas after drying. Preferably, the first humidity sensor 600a may be provided in a pre-filter pipe, or a pipe between the filter and the dryer 200. Preferably, the second humidity sensor 600b may be disposed in a pipe between the dryer 200 and the membrane filtration device 700, and may also be disposed in a pipe between the membrane filtration device 700 and the air quality sensing unit 300. The humidity measured by the first and

second humidity sensors

600a and 600b is transmitted to the processor 400 by a signal. The processor 400 calculates the amount of change in humidity.

The drying chamber 200a can be communicated with the air path switching device 500. The air path switching device 500 may be a solenoid valve. The processor 400 can shut down the operating drying chamber by introducing the target gas from the operating drying chamber into another drying chamber that has not been operated based on the amount of humidity change. 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 processor starts the air path switching device, and switches the air path to enable the air to pass through another drying chamber, so as to effectively remove 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, the drying chambers 200a are each provided with a heating unit 200 b. And the heating units 200b are connected in parallel with each other and can be electrically conducted with the power supply apparatus. Because miniature air monitoring station sets up in the open air, consequently, power supply unit mainly adopts solar energy power generation or wind energy power generation, and it can gather the energy of nature and carry out autonomic power supply, can effectively reduce power supply unit's maintenance and battery replacement. And, the heater 200b is not always required to be conducted for heating, it can heat and dehumidify the drying chamber at night, and the heating device can be charged by solar energy in the daytime. The heating unit 200b can be activated after the corresponding drying chamber 200a dries the gas and in an idle state, for heating and dehumidifying the drying chamber 200 a. Preferably, the heating unit 200b can be activated in response to a heating instruction of the processor 400 for heating and dehumidifying the drying chamber 200 a. As shown in fig. 3, the processor 400 may send a heating instruction to the heating unit 200b only when the drying chamber 200a in the dryer 200 is used by a certain amount, so that the used drying chamber 200a can be simultaneously conducted for dehumidification, and this way, the power supply device can have sufficient power supply. Alternatively, the processor 400 may monitor the power of the power supply device and calculate the number of the heating units 200b that can be activated by the power supply device.

Preferably, the electric heater is directly placed in the desiccant tube, fully contacts with the desiccant particles in a spiral winding mode, electrodes at two ends of the heater are led out of the desiccant tube under the condition of ensuring air tightness, a heating power supply is connected, the electric heating tube is heated by applying voltage and keeps the temperature at 70-80 ℃, and water molecules absorbed by the desiccant are desorbed. The dehumidifying time of the desiccant needs to be calibrated in advance, so that the humidity of the rear end of the desiccant can be less than 50% after the desiccant is dehumidified and put into use, and the service life of the desiccant is similar to that of a brand-new drying pipe (namely, similar replacement frequency is achieved).

The inlet end of the drying chamber is provided with a plurality of paths of two-way electrovalves which are connected in parallel, the channel for gas to enter can be selectively opened through the control panel, and meanwhile, the unused channel is kept in a closed state; the outlet end is provided with a plurality of paths of three-way electric valves connected in parallel, gas can be selected by the control panel to flow out to the sensor air cavity through a certain path, and meanwhile, an unused channel is closed, or the channel in heating and drying is connected with the atmosphere to discharge water vapor.

The heating part of the heating pipe is arranged in the drying agent pipe, and the electrodes at two ends of the heating pipe are led out of the drying pipe under the condition of ensuring the air tightness and are connected with a heating power supply. The control panel can selectively apply voltage to one or more heating pipes to perform heating and drying operation.

Preferably, during one drying cycle, the heating unit 200b can be activated at least once, that is: before all the drying chambers 200a are used up, the processor 400 can at least generate a heating instruction and send the heating instruction to at least one of the heating units to heat and dehumidify the drying chambers 200a, so that the drying units 200b can repeatedly and continuously dry the target gas.

Example 2

This embodiment may be a further improvement and/or a supplement to embodiment 1, 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.

In the case of metal oxide semiconductor gas sensors (air detection cells), humidity, i.e., water, has a variety of effects on the surface of the gas sensitive material, including changing the number of free electrons, changing the electron affinity or occupying active sites, etc., which effects result in a drift of the sensor baseline and a change in the sensitivity of the response to the target gas. For electrochemical gas sensors, humidity affects the rate of redox reactions at the electrodes, which in turn causes baseline drift and changes in sensitivity to the target gas response. Since the sensor is generally calibrated in dry air before leaving the factory, the higher the humidity in actual use, the greater the influence on the sensitivity of the sensor. (atmospheres below 20% relative humidity can be approximated as dry air) since in outdoor applications the relative humidity can vary from 30% to 95% during different seasons and the relative humidity can also vary by a factor of two between day and night, which requires that the sensor must compensate for humidity to obtain accurate gas concentration data (active compensation) or to control the air humidity to a small reasonable range (e.g. less than 50%, passive compensation).

Preferably, at least two drying chambers 200a are provided with replaceable drying cartridges therein. As shown in fig. 2, the dryer 200 has a total of N (N is 2 or more) drying chambers. The drying time of each drying chamber (1, 2 … …, n-1, n) is t₁、t₂、……t_-1、t_n。t₁、t₂、……t_-1、t_nThe sum of which is one drying cycle. The switching frequency of the air path switching device 500 is recorded as M. In a drying cycle, if M reaches a preset number, the processor 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 dryer 200, the processor 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 processor 400 may be connected through a wireless network.

Preferably, the drying cycle can be redefined by the cloud server 900 and communicated back to the processor 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.

The desiccant has the function of dehumidifying the high-humidity gas to keep the humidity at a low value (less than 50%); on the other hand, after a period of use, there is also a humidification effect for gases with too low a humidity. In summary, the desiccant can perform the functions of dehumidifying, reducing the humidity difference between day and night (the humidity in the middle of summer can be as low as 30 percent, and the humidity in the middle of night can be as high as 70 percent), and reducing the humidity change caused by the sudden change of weather (the weather changes from sunny days to rainy days, and the rainy days to sunny days). Because a common sensor is calibrated in dry air before leaving a factory, the influence of humidity on the response of the sensor can be reduced to a certain extent only by controlling the humidity by the desiccant, and false signals caused by periodic change or sudden change of the humidity are reduced, so that accurate humidity compensation cannot be realized.

The reversible water-absorbing color-changing silica gel is selected as the main component of the drying agent. After heating, the desiccant can dehydrate and recover the water absorption capacity.

When the rear end humidity is continuously more than 50% within a period of time (such as two hours), the drying agent is selected to be replaced, or the drying agent is switched to a standby drying agent. Depending on the weather conditions and the maximum water absorption capacity of the drying agent, and the season with less rainfall, the drying agent is expected to be replaced once in 10-14 days; in the season of frequent rainfall, the change is expected to be performed once in 5-7 days.

Preferably, the humidity value of the dried target gas passing through the drying chamber 200a needs to satisfy a certain humidity environment, so that the sensor in the air quality sensing unit 300 can be cleaned by the target gas, which is beneficial to improving the sensitivity of the sensor. Therefore, the processor 400 generates a switching instruction to enable the air path switching device 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 processor 400 can acquire a humidity value of the target gas before and after being dried by the dryer 200. The processor 400 transmits it to the cloud server 900 in such a manner that the detection values of the air quality sensing 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. The processor can acquire the humidity value of the target gas before and after drying through the dryer, and sends the humidity value to the cloud server in a mode corresponding to the detection value of the air quality sensing unit, so that the cloud server can generate an air detection model of the humidity value and the detection value. 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.

Preferably, the dry filtration system comprises a filter. The filter is preceded by an air quality sensing unit 300. The filter includes 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 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. 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 processor 400, and more particularly, a processor 400 for a drying system of a micro air monitoring station. The processor 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 dryer 200. And in the event that the amount of change is within the threshold amount of change, the processor can generate a switching instruction to enable gas path switching device 500 to introduce gas into the not-yet-operating drying chamber and shut off gas from entering the operating drying chamber. And the processor 400 can send a heating instruction to the heating unit 200b to heat the drying agent, so that the drying agent can be dried for reuse, thereby reducing the maintenance cost of the drying agent and improving the use efficiency of the drying agent.

Preferably, the processor 400 is capable of being communicatively coupled to a cloud server 900 located at the monitoring center.

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 dryer 200 dehumidifies the target gas entering the air quality-sensing unit 300,

s2: the processor 400 calculates the amount of humidity change of the target gas before and after drying by the dryer 200.

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

S21: the processor 400 is configured to: a switching instruction generated based on the humidity change amount is sent to the air path switching device 500, so that the air path switching device 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 gas path switching device, gas 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 auto-change over device, 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. A reusable inlet air drying filter system adapted for grid-enabled atmospheric monitoring, comprising:

a dryer (200) that dehumidifies the target gas entering the air quality sensing unit (300),

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

the dryer (200) is configured with at least two parallel drying chambers (200a) each communicable with the air quality sensing unit (300),

the drying chambers (200a) are all provided with heating units (200b), and the heating units (200b) can be started after the drying chambers (200a) corresponding to the heating units dry gas and are in an idle state, and are used for heating and dehumidifying the drying chambers (200 a).

2. The drying and filtering system according to claim 1, wherein the at least two drying chambers (200a) connected in parallel are each communicable with an air path switching device (500), and the air path switching device (500) is configured to introduce the target gas to be measured from one drying chamber to the other drying chamber in a case where a processor (400) sends a switching instruction generated based on a humidity variation before and after drying the target gas to the air path switching device (500).

3. Drying and filtering system according to claim 1 or 2, wherein said heating unit (200b) is activatable in response to a heating command of said processor (400) for heating and dehumidifying said drying chamber (200).

4. Drying and filtering system according to one of the preceding claims, wherein the heating unit (200b) can be activated at least once during one drying cycle, so that the drying unit (200b) can dry the target gas repeatedly and continuously.

5. Drying and filtering system according to one of the preceding claims, wherein the processor (400) sends a switching instruction to the air path switching device (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).

6. Drying and filtering system according to one of the preceding claims, characterised in that replaceable drying cartridges are arranged in the at least two drying chambers (200a),

in a drying period, the processor (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 device (500) reaches a preset frequency.

7. Drying and filtering system according to one of the preceding claims, characterized in that the energy of the heating unit (200b) can be derived from solar and/or wind energy.

8. Dry filter system according to one of the preceding claims, characterized in that the dry filter system comprises a filter (100), the filter (100) being preceded by the air quality sensor unit (300), the filter (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).

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

dehumidifying the target gas entering the air quality sensing unit (300) using a dryer (200),

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

configuring the dryer (200) with at least two parallel drying chambers (200a) each communicable with the air quality sensing unit (300),

wherein, the drying chamber (200a) is provided with a heating unit (200b), and the heating unit (200b) can be started after the corresponding drying chamber (200a) dries the gas and is in an idle state, and is used for heating and dehumidifying the drying chamber (200 a).

10. The drying and filtering method according to claim 9, wherein the at least two drying chambers (200a) connected in parallel can be communicated with an air path switching device (500), and the air path switching device (500) can guide the target gas to be measured from one drying chamber to the other drying chamber in the case that a processor (400) sends a switching instruction generated based on the humidity change amount of the target gas before and after drying to the air path switching device (500).