CN110687023A - Double-channel online particulate matter monitor - Google Patents

Abstract

The invention discloses a dual-channel online particulate matter monitor, comprising a sampling head, a virtual impactor, a main air circuit, a PM2.5 branch air circuit, a PM10 branch air circuit, a zero-air backflushing air circuit, a control unit, and a sampling head passing through The trachea is connected with the virtual impactor. The virtual impactor is provided with a PM2.5 air inlet and a PM10 air inlet. The PM2.5 air inlet and the PM10 air inlet are respectively connected with the PM2.5 branch and the PM10 branch. The PM2.5 branch circuit and the PM10 branch circuit are arranged along the direction of the airflow in turn with a photometer, a filter, a normally open solenoid valve, a mass flow meter, an air pump, and an end filter. The end filter, the air pump and the zero air filter are arranged in sequence through the air pipe, and the zero air filter is connected with the two photometers through two normally closed solenoid valves respectively. Simultaneous measurement and multi-channel flow measurement and control are added at the same time to ensure long-term stable operation of the instrument.

Description

A dual-channel online particle monitor

technical field

The invention belongs to the technical field of environmental monitoring, and in particular relates to a dual-channel online particle monitor.

Background technique

One of the main pollutants in my country's atmosphere is aerosols, which are commonly referred to as PM2.5 and PM10. Aerosol particles and colloidal particles absorb and scatter solar radiation, directly changing the energy budget of the earth-air system; in addition, particulate matter pollution in the air has brought serious harm to people's health.

With the governance in recent years, some progress has been made in the control of PM2.5 and PM10 pollution. Base station-type particulate matter monitoring can no longer meet the needs of accurate haze control. The accurate measurement of PM2.5 and PM10 in counties and towns, as well as the traceability monitoring of industrial pollution sources, have put forward new requirements for online particulate matter monitoring instruments.

The field of environmental monitoring in my country has ushered in a new era of grid and three-dimensional monitoring, which puts forward new requirements for instrument portability, rapidity, and accuracy. The optical detection method can realize fast, on-site and accurate measurement, and has great application prospects. With the expansion of national grid and three-dimensional monitoring requirements, there are new application scenarios for particle optical monitoring instruments.

The application number is: CN201620767997.8, the application date is: 20160721, and the title is: a patent for an online particulate matter monitoring device, an online particulate matter monitoring device is disclosed, including: a virtual impactor, a main gas path, a branch gas path , control module, the intake pipe II of the main air circuit passes through the solenoid valve I and is connected to the branch circuit, the intake pipe I is connected with the virtual impactor, and the branch circuit is directly connected with the virtual impactor after passing through the solenoid valve I, causing its There is a photometer on the road, which is used to measure the volume of particulate matter; the control module is connected to the solenoid valve I through the signal bus to realize the switching of the main gas circuit and the branch gas circuit, and achieve less than or equal to PM2.5 and greater than PM2.5 to less than or equal to PM2.5 For the effective separation of PM10 particles, the light source and the photodetector in the photometer are distributed at 90° in space. The principle of light reflection is used to detect the volume of particles, and the data is sent to the control module, which can store the volume data of particles through the memory, and the data Transceiver unit, this set of devices only implements the single photometer method to test the concentration of particulate matter, and cannot realize the simultaneous monitoring of PM2.5 and PM10 particulate matter.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a dual-channel online particulate matter monitor in order to overcome the above-mentioned defects of the prior art

The object of the present invention can be realized through the following technical solutions:

A dual-channel online particulate matter monitor includes a sampling head 1, a virtual impactor 2, a main gas circuit 3, a PM2.5 branch gas circuit 4, a PM10 branch gas circuit 5, and a control unit 9. The sampling head 1 communicates with the trachea through the trachea. The virtual impactor 2 is connected, and the main gas path 3, the PM2.5 branch gas path 4, and the PM10 branch gas path 5 are connected with the control unit 9;

The virtual impactor 2 is provided with a PM2.5 air inlet 201 and a PM10 air inlet 202, and the PM2.5 air inlet 201 and the PM10 air inlet 202 are respectively connected with the PM2.5 branch 4 and the PM10 branch. Road 5 connection;

The PM2.5 branch path 4: the PM2.5 branch path 4 is connected to the PM2.5 air inlet 201 through a trachea, and a PM2.5 photometer 7, a filter, a normally open source are arranged in sequence along the direction of the airflow. Solenoid valve, mass flow meter, air pump;

The PM10 branch circuit 5: the PM10 branch circuit 5 is connected to the PM10 air inlet 202 through a trachea, and the PM10 photometer 8, a filter, a normally open solenoid valve, a mass flow meter, and an air pump are arranged in turn along the direction of the airflow. ;

The main air path 3: The main air path 3 is connected to the air pipe between the PM2.5 air inlet 201 and the PM2.5 photometer 7 through the air pipe, and the filter 301 is arranged in sequence along the direction of the air flow, and the normally open Solenoid valve 302 , mass flow meter 303 , air pump 304 .

Preferably, the normally open solenoid valves of PM2.5 branch 4, PM10 branch 5, and main air 3 in the dual-channel online particulate matter monitor are respectively connected to the control unit 9 through a bus, and the PM2.5 branch is The air pumps of the air circuit 4, the PM10 branch air circuit 5, and the main air circuit 3 are respectively connected with the control unit 9 through the bus, and the mass flow meters of the PM2.5 branch air circuit 4, the PM10 branch air circuit 5, and the main air circuit 3 are respectively It is connected to the control unit 9 via a bus.

Preferably, end filters are provided at the ends of the air pumps of the main air path 3 , the PM2.5 branch air path 4 , and the PM10 branch air path 5 .

Preferably, the dual-channel online particulate matter monitor further includes a zero-air backflushing gas circuit 6, and the zero-air backflushing gas circuit 6 is sequentially provided with an end filter, an air pump, and a zero-air filter 603 through the air pipe along the direction of the airflow. , the zero air filter 603 is respectively connected with the normally closed solenoid valve 601 and the normally closed solenoid valve 602, the normally closed solenoid valve 601 is connected with the PM2.5 photometer 7, and the normally closed solenoid valve 602 is connected with the PM10 photometer 8 connection, the air pump, normally closed solenoid valve 601 and normally closed solenoid valve 602 of the zero air backflushing gas path 6 are respectively connected with the control unit 9 through a bus.

Preferably, the main gas path 3 and the PM2.5 branch gas path 4 are connected to the PM2.5 air inlet 201 through an isokinetic sampling device.

Preferably, the dual-channel online particulate matter monitor further includes a temperature and humidity sensor 10, the temperature and humidity sensor 10 is connected to the control unit 9, and a radiation protection cover is provided outside the temperature and humidity sensor 10.

Preferably, the dual-channel online particulate matter monitor further includes a GPRS component 11 , and the GPRS component 11 is connected to the control unit 9 .

Preferably, the control unit 9 is provided with a backlit display screen, a GPRS component card slot, and an SD card slot.

Beneficial effects of the present invention:

This patent realizes the simultaneous monitoring of PM2.5 and PM10, optimizes the performance of the instrument, ensures the accuracy of the data, and can realize the simultaneous measurement of PM2.5 and PM10 without switching the gas path, and at the same time increases the multi-channel flow measurement and control, To ensure long-term stable operation of the instrument, one device can be used for multiple purposes and save costs.

Description of drawings

FIG. 1 is a schematic structural diagram of a dual-channel online particulate matter monitor.

In the picture: 1-sampling head; 2-virtual impactor; 201-PM2.5 air inlet; 202-PM10 air inlet; 3-main air path; 301-filter; 302-normally open solenoid valve; 303- Mass flow meter; 304-air pump; 305-end filter; 4-PM2.5 branch gas path; 5-PM10 branch gas path; 6-zero air backflush gas path; 7-PM2.5 photometer; 8-PM10 Photometer; 9-Control Unit; 10-Temperature and Humidity Sensor; 11-GPRS Parts.

Detailed ways

As shown in conjunction with the accompanying drawings, the technical scheme of the present invention is further described:

A dual-channel online particle monitor can realize simultaneous monitoring of PM2.5 and PM10. The new dual-channel online particle monitor has redesigned and transformed the structure of the instrument on the basis of the existing one. On the basis of the original single photometer method, it is upgraded to a unique dual photometer method; and the control of multi-channel airflow is added to optimize the performance of the instrument and ensure the accuracy of data.

A dual-channel online particulate matter monitor, comprising a sampling head 1, a virtual impactor 2, a main gas path 3, a PM2.5 branch gas path 4, a PM10 branch gas path 5, and a control unit 9, wherein the PM2.5 branch gas path Road 4 is the channel air circuit of PM2.5, the PM10 branch circuit 5 is the channel air circuit of PM10, the sampling head 1 is placed in the air to be detected, and the sampling head 1 is connected with the virtual impactor 2 through the trachea , the virtual impactor 2 is provided with a PM2.5 air inlet 201 and a PM10 air inlet 202, the PM2.5 air inlet 201 and the PM10 air inlet 202 are respectively connected with the PM2.5 branch air path 4 and the PM10 branch Air line 5 connection;

The PM2.5 branch path 4: the PM2.5 branch path 4 is connected to the PM2.5 air inlet 201 through a trachea, and a PM2.5 photometer 7, a filter, a normally open source are arranged in sequence along the direction of the airflow. Solenoid valve, mass flow meter, air pump, end filter;

The PM10 branch circuit 5: the PM10 branch circuit 5 is connected to the PM10 air inlet 202 through a trachea, and the PM10 photometer 8, a filter, a normally open solenoid valve, a mass flow meter, and an air pump are arranged in turn along the direction of the airflow. , end filter;

The main air path 3: The main air path 3 is connected to the air pipe between the PM2.5 air inlet 201 and the PM2.5 photometer 7 through the air pipe, and the filter 301 is arranged in sequence along the direction of the air flow, and the normally open Solenoid valve 302, mass flow meter 303, air pump 304, end filter 305;

In this embodiment, the main gas path 3 and the PM2.5 branch gas path 4 are connected to the PM2.5 air inlet 201 through the isokinetic sampling device.

The dual-channel online particulate matter monitor also includes a zero-air backflushing gas path 6, and the airflow direction of the zero-air backflushing gas path 6 is opposite to the airflow direction of the PM2.5 branch gas path 4 and the PM10 branch gas path 5. , the zero-air blowback air path 6 is sequentially provided with an end filter, an air pump, and a zero-air filter 603 through the air pipe along the direction of the air flow. 602 is connected, the normally closed solenoid valve 601 is connected with the PM2.5 photometer 7 , and the normally closed solenoid valve 602 is connected with the PM10 photometer 8 .

In this dual-channel online particulate matter monitor, the normally open solenoid valves of PM2.5 branch 4, PM10 branch 5, and main gas 3 are respectively connected with the control unit 9 through the bus. The normally closed solenoid valve 601 and the normally closed The solenoid valve 602 is respectively connected with the control unit 9 through a bus, and the air pumps of the PM2.5 branch circuit 4, the PM10 branch circuit 5, the main air circuit 3, and the zero-air backflushing air circuit 6 are respectively connected with the control unit 9 through the bus. The mass flow meters of the PM2.5 branch gas path 4, the PM10 branch gas path 5, and the main gas path 3 are respectively connected with the control unit 9 through a bus.

The main gas path 3 cooperates with the PM2.5 branch gas path 4 and the PM10 branch gas path 5 to control the intake air flow rate of the sampling head 1 and the flow distribution ratio of the virtual impactor 2 . Zero air backflush gas circuit 6 tests the zero air background signal.

In this embodiment, the control unit 9 is connected to the temperature and humidity sensor 11, the control unit is connected to the GPRS component 11, the temperature and humidity sensor 10 is used for measuring the temperature and humidity of the air, and the GPRS component 11 is used for the control unit Information data interaction, communication and transmission with the cloud.

In this embodiment, the sampling head 1 uses a PM10 impact sampling head for measurement. Particles larger than 10 μm in diameter will be deposited in the impact sampling head when inhaled. The sampling flow of the sampling head 1 is consistent with the sampling flow of the virtual impactor 2 . Then, the inhaled air is divided into two air tributaries by the virtual impactor.

By adjusting the main air circuit 3 and PM2.5 branch air circuit 4, the normally open solenoid valve of PM10 branch air circuit 5, the photometer can detect the aerosols of the two air tributaries, and the PM2.5 photometer 7 can test the PM2.5 branch. The PM2.5 concentration value of the gas path 4, the PM10 photometer 8 tests the PM10 concentration value of the PM10 branch gas path 5. The zero air backflush gas circuit 6 is adjusted by measuring the zero value of the photometer with filtered air. Measurement results are automatically stored in the instrument memory or SD card.

Finally, it should be noted that the above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the present invention can still be modified or Equivalents are substituted without departing from the spirit and scope of the invention, and the appended claims are intended to cover such modifications or equivalents as fall within the spirit and scope of the invention.

Claims (8)

1. A dual-channel online particulate matter monitor, comprising a sampling head (1), a virtual impactor (2), a main gas path (3), a PM2.5 branch gas path (4), and a PM10 branch gas path (5), A control unit (9), the sampling head (1) is connected to the virtual impactor (2) through a trachea, the main air circuit (3), the PM2.5 branch air circuit (4), and the PM10 branch air circuit (5) connected with the control unit (9); It is characterized by: The virtual impactor (2) is provided with a PM2.5 air inlet (201) and a PM10 air inlet (202), the PM2.5 air inlet (201) and the PM10 air inlet (202) are respectively connected to the PM2 air inlet (202). .5 branch (4) is connected with PM10 branch (5); The PM2.5 branch path (4): the PM2.5 branch path (4) is connected to the PM2.5 air inlet (201) through a trachea, and a PM2.5 photometer ( 7), filter, normally open solenoid valve, mass flow meter, air pump; The PM10 branch circuit (5): the PM10 branch circuit (5) is connected to the PM10 air inlet (202) through a trachea, and a PM10 photometer (8), a filter, a normally open device are arranged in sequence along the direction of the airflow. Solenoid valve, mass flow meter, air pump; The main air path (3): the main air path (3) is connected to the air pipe between the PM2.5 air inlet (201) and the PM2.5 photometer (7) through the air pipe, along the direction of the air flow A filter (301), a normally open solenoid valve (302), a mass flow meter (303), and an air pump (304) are arranged in sequence. 2. The dual-channel on-line particulate matter monitor according to claim 1, characterized in that: in the dual-channel on-line particulate matter monitor, PM2.5 branch gas path (4), PM10 branch gas path (5), main gas path The normally open solenoid valves of (3) are respectively connected with the control unit (9) through a bus, and the air pumps of the PM2.5 branch circuit (4), the PM10 branch circuit (5), and the main air circuit (3) are connected to The unit (9) is connected through a bus, and the mass flow meters of the PM2.5 branch gas path (4), the PM10 branch gas path (5), and the main gas path (3) are respectively connected with the control unit (9) through the bus line. 3. The dual-channel on-line particulate matter monitor as claimed in claim 1, characterized in that: the main gas circuit (3), the PM2.5 branch gas circuit (4), and the air pump end of the PM10 branch gas circuit (5) are provided with There are end filters. 4. The dual-channel online particulate matter monitor according to claim 1, wherein the dual-channel online particulate matter monitor further comprises a zero-air backflushing gas circuit (6), and the zero-air backflushing gas circuit (6) ) along the direction of air flow through the trachea, the end filter, the air pump and the zero air filter (603) are arranged in sequence, and the zero air filter (603) is respectively connected with the normally closed solenoid valve (601) and the normally closed solenoid valve (602) connection, the normally closed solenoid valve (601) is connected with the PM2.5 photometer (7), the normally closed solenoid valve (602) is connected with the PM10 photometer (8), and the zero-air backflush gas path (6) ), the normally closed solenoid valve (601), and the normally closed solenoid valve (602) are respectively connected with the control unit (9) through a bus. 5. The dual-channel online particulate matter monitor according to claim 1, characterized in that: the main gas path (3) and the PM2.5 branch gas path (4) are connected to the PM2.5 air inlet through an isokinetic sampling device port (201) is connected. 6. The dual-channel online particulate matter monitor according to claim 1, wherein the dual-channel online particulate matter monitor further comprises a temperature and humidity sensor (10), the temperature and humidity sensor (10) and the control unit (9) ) connection, the temperature and humidity sensor (10) is provided with a radiation protection cover outside. 7. The dual-channel online particle monitoring instrument according to claim 1, characterized in that: the dual-channel online particle monitoring instrument further comprises a GPRS component (11), and the GPRS component (11) is connected with the control unit (9) . 8. The dual-channel online particulate matter monitor according to claim 1, wherein the control unit (9) is provided with a backlit display screen, a GPRS component card slot, and an SD card slot.

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