CN215179467U

CN215179467U - Particle concentration monitor with combined photometer and optical particle counter

Info

Publication number: CN215179467U
Application number: CN202121450353.3U
Authority: CN
Inventors: 陈剑; 德克·魏道尔
Original assignee: Comde Derenda Wuxi Measuring Technologies Co ltd
Current assignee: Comde Derenda Wuxi Measuring Technologies Co ltd
Priority date: 2021-06-28
Filing date: 2021-06-28
Publication date: 2021-12-14
Anticipated expiration: 2031-06-28

Abstract

The utility model provides a particle concentration monitor that photometer and optical particle counter used together mainly includes PM₁₀A sampling head control center; PM (particulate matter)₁₀The sampling head is sequentially connected with a photometer and an optical particle counter; a filter, a flow meter and an air pump; a wireless data transmission module is arranged in the control center; the control center is respectively connected with the photometer, the optical particle counter, the flow meter and the air pump in a wireless way through the wireless data transmission module. The utility model discloses use photometer specific wavelength to measure PM2.5 mass concentration to cooperation optical particle counter obtains particulate matter cluster total number, and both mutually support, can acquire not in the air according to functional relationThe mass concentration of the particles with the same particle size is simple and practical.

Description

Particle concentration monitor with combined photometer and optical particle counter

Technical Field

The utility model relates to an online particulate matter concentration monitoring equipment field especially relates to a particulate matter concentration monitor of photometer and optical particle counter antithetical couplet usefulness.

Background

The optical technique can realize rapid and accurate measurement of environmental particles, and is generally classified into a light scattering method and a particle technique method. The light scattering method is generally called a particle photometer, and the mass concentration of particles in a measurement area can be obtained by measuring the intensity of scattered light at a fixed angle. The optical particle counter method can determine the size of the particles by measuring the scattering signal of the single particles; the number concentration of the particulate matter can be obtained by counting the number of the particulate matter of different sizes. Photometers are commonly used to measure the mass concentration of particulate matter, however due to technical limitations, the mass concentration of a certain population of particulate matter is generally only available. The concentration of particulate matter of different particle sizes in the atmosphere cannot be obtained using either the photometer or the optical particle counter alone.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem that single photometer or optical particle counter can not obtain the concentration of different particle diameter particulate matters in the atmosphere, the utility model provides a particle concentration monitor of photometer and optical particle counter antithetical couplet usefulness.

The utility model provides a technical scheme does:

the utility model provides a photometer and optical particle counter ally oneself with particulate matter concentration monitor of usefulness, including PM₁₀A sampling head control center; the PM₁₀The sampling head is sequentially connected with a photometer and an optical particle counter; a filter, a flow meter and an air pump; a wireless data transmission module is arranged in the control center; the control center is respectively in wireless connection with the photometer, the optical particle counter, the flowmeter and the air pump through the wireless data transmission module.

Preferably, a temperature and humidity pressure sensor is arranged in the control center.

Preferably, the control center is further provided with an equipment real-time monitoring module, an equipment remote control module, a monitoring information display and interaction module and a multi-source data local storage management module.

Preferably, the visible light of the photometer is set to a wavelength of 0.4 to 0.7 μm.

The utility model has the advantages that:

the utility model provides a photometer and optical particle counter ally oneself with particulate matter concentration monitor of usefulness uses photometer specific wavelength to measure PM2.5 mass concentration to cooperation optical particle counter obtains the total number of particulate matter cluster, and both mutually support, can acquire different particle diameter particulate matter mass concentration in the air according to the functional relation, and simple structure and effective.

Drawings

The invention and its features, aspects and advantages will become more apparent from a reading of the following detailed description of non-limiting embodiments with reference to the attached drawings. Like reference symbols in the various drawings indicate like elements. The drawings are not intended to be drawn to scale, emphasis instead being placed upon illustrating the principles of the invention.

FIG. 1 is a block diagram of the present invention;

FIG. 2 is a block diagram of the control center of the present invention;

FIG. 3 shows the particle distribution function f (D) of the present invention.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application.

It will be understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

As the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, their indicated orientation or positional relationship is based on that shown in the drawings, merely for convenience in describing the invention and simplifying the description, and does not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.

The appearances of the terms first, second, and third, if any, are used for descriptive purposes only and are not intended to be limiting or imply relative importance.

Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The technical solutions in the embodiments of the present invention are described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

Example 1

In order to solve the technical problem that single photometer or optical particle counter can not obtain the concentration of different particle diameter particulate matters in the atmosphere, the embodiment of the utility model provides a particle concentration monitor that photometer and optical particle counter used jointly, including PM₁₀The sampling head 1 controls the center 2; PM (particulate matter)₁₀The sampling head 1 is sequentially connected with a photometer 3 and an optical particle counter 4; a filter 5, a flow meter 6 and an air pump 7; a wireless data transmission module 8 is arranged in the control center 2; the control center is respectively connected with the photometer 3, the optical particle counter 4, the flow meter 6 and the air pump 7 in a wireless way through a wireless data transmission module 8.

When the particle concentration monitor with the photometer and the optical particle counter combined works, the particles pass through PM₁₀After the sampling head 1 is cut, only the grain diameter is less than 10 muThe particles m can enter a sampling tube and sequentially pass through a photometer 3, an optical particle counter 4, a filter 5, a flow meter 6 and an air pump 7;

the number of different particle clusters can be obtained by the optical particle counter 4, but the number obtained by the optical particle counter 4 cannot be used directly for calculating PM₁、PM₄And PM₁₀The concentration of (c). The particle number obtained by the optical particle counter 4 corresponds to the total number of the particulate matter clusters, and the interval between the particulate matter clusters is large, so that the distribution of the particulate matter cannot be completely reflected. In the following formula, m_PIs the mass concentration of the particulate matter; NP is the number of particles, p_PIs the density of the particles, D_PIs the equivalent volume diameter; p represents particles of different sizes (1, 2.5, 4, 10.. mu.m);

PM obtained by Photometer 3_2.5Mass concentration m of_2.5：

Since the number of fine particulate matter accounts for most of the environmental particulate matter, PM_2.5The equivalent diameter of the particle clusters is less than 2.5 μm, PM_2.5The volume equivalent diameter is related to the distribution of all particles below 2.5 μm, but 2.5 μm cannot be used as the equivalent diameter, which needs to be calculated from the distribution of the number of particles.

N_2.5The number of (2) is the total number of all particles with a particle size of less than 2.5 μm, the number of particles of the particulate matter cluster obtained by the optical particle counter 4, and then the distribution curve function N ═ f (d) of the particles is obtained by fitting, as shown in fig. 3. Since the number of fine particles occupies most of the environmental particles, the distribution of the particles generally follows the distribution function in the following figure, i.e., the rising trend of the total number of particles gradually becomes slower.

According toThe particle distribution function f (D) can obtain the equivalent volume diameter D of different particle clusters_PA distribution function.

PM obtained by Photometer 3_2.5Mass concentration m of_2.5And the number of particle clusters obtained by the optical particle counter 4, the mass concentration (PM) of other particle clusters can be converted₁、PM₄、PM₁₀)。

When the atmospheric particulate is sampled, the accuracy of the mass concentration of the particulate depends on whether the sampling flow is kept stable or not, and the particulate matters in high-humidity air are mutually adhered to block a filter hole of a sampling head, so that the flow speed of the air in the sampling head is uneven, the flow is reduced, and the monitoring of the mass concentration of the particulate matters in the air is directly influenced; the correlation research shows that the concentration of the atmospheric particulate matters is highly linearly and negatively correlated with the temperature, and the air pressure is also negatively correlated with the atmospheric temperature and the atmospheric humidity; therefore, in this implementation, it is preferable that a temperature and humidity pressure sensor 9 is arranged in the control center 2, so as to monitor the humidity, the temperature and the air pressure of the monitoring point in real time, and ensure the validity and the accuracy of the monitoring result.

In order to implement the present invention, it is preferable that the control center further includes an apparatus real-time monitoring module 10 for monitoring the operation state of each apparatus in real time, an apparatus remote control module 11 for performing remote control management on the apparatus, a monitoring information display and interaction module 12 for performing query and statistical analysis on the monitoring information, and a multi-source data local storage and management module 13 for storing and managing the monitoring data.

In this embodiment, the visible light wavelength of the photometer 3 is preferably set to 0.4 to 0.7. mu.m. When the set wavelength of visible light is 0.4-0.7 μm, the visible light scattering signal is stronger when the particle size of the particulate matter is less than 2.5 μm, and PM can be monitored in a targeted manner_2.5The concentration of (c).

The above-described embodiments are merely illustrative of the principles and utilities of the present patent application and are not intended to limit the present patent application. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of this patent application. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical concepts disclosed in the present application shall be covered by the claims of this patent application.

Claims

1. A particle concentration monitor with a photometer and an optical particle counter combined, which is characterized by comprising PM₁₀A sampling head control center; the PM₁₀The sampling head is sequentially connected with a photometer and an optical particle counter; a filter, a flow meter and an air pump;

a wireless data transmission module is arranged in the control center; the control center is respectively in wireless connection with the photometer, the optical particle counter, the flowmeter and the air pump through the wireless data transmission module.

2. The particle concentration monitor using a photometer in conjunction with an optical particle counter of claim 1, wherein: and a temperature and humidity pressure sensor is arranged in the control center.

3. The particle concentration monitor using a photometer in conjunction with an optical particle counter of claim 1, wherein: the control center is also provided with an equipment real-time monitoring module, an equipment remote control module, a monitoring information display and interaction module and a multi-source data local storage management module.

4. The particle concentration monitor using a photometer in conjunction with an optical particle counter of claim 1, wherein: the photometer sets the visible wavelength to 0.4-0.7 μm.