Novel real-time PM2.5 (particulate matter 2.5) mass concentration monitoring device and monitoring method

Abstract

The invention relates to a novel real-time PM2.5 (particulate matter 2.5) mass concentration monitoring device and a monitoring method. The monitoring device comprises a PM2.5 sampling mechanism, a particle aggregating mechanism and a photoelectric measuring mechanism, wherein the PM2.5 sampling mechanism is used for obtaining sample gas which only contains the PM2.5; the particle aggregating mechanism is used for aggregating particles entering the mechanism, absorbing minuteness particle ingredients and reducing the particle number; and the photoelectric measuring mechanism is used for converting an optical signal into a digital signal and processing so as to output the mass concentration data of the detected PM2.5 in real time. By utilizing the novel real-time PM2.5 (particulate matter2.5) mass concentration monitoring device and the monitoring method provided by the invention, the PM2.5 is subjected to aggregation treatment, so that the number of the particles in the sample air is greatly reduced, the data processing quantity of the device is reduced, and the measurement speed is accelerated; and in the photoelectric measurement procedure, peak value signals of large particles and signals of small particles are separately processed, and the signals are subjected to sublevel so as to calculate the average value, so that the precision of the device is improved, and thus the PM2.5 mass concentration is monitored efficiently in real time.

Description

technical field [0001] The invention relates to the field of environmental monitoring and protection, in particular to a novel PM2.5 mass concentration real-time monitoring device and monitoring method. Background technique [0002] PM2.5 refers to atmospheric particulate matter with an aerodynamic equivalent diameter of less than or equal to 2.5 μm, usually referred to as fine particles or fine particulate matter, and in China is also referred to as particulate matter that can enter the lungs. The main components of PM2.5 are elemental carbon, organic carbon compounds, sulfates, nitrates, and ammonium salts. In addition, common components include various metal elements, including sodium, magnesium, calcium, aluminum, iron and other elements that are abundant in the earth's crust, as well as lead, zinc, cadmium, copper and other heavy metal elements mainly derived from human pollution . PM2.5 mainly comes from combustion, dust and other processes, such as coal combustion, ...

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Problems solved by technology

[0015] Similarly, the light scattering method also has defects. In addition to the high processing accuracy of the instrument, when it is used for actual concentration measurement, due to the influence of temperature and humidity, the accuracy of the instrument is difficult to guarantee. In addition, the actual particle shape is irregular and the movement is irregular. It is very complicated in mathematical approximation processing, therefore, the current instruments based on light scattering method must also rely on other basic methods such as weighing method for calibration and calibration

[0016] Due to its particularity and complexity, the current monitoring methods for PM2.5 concentration are still insufficient, and the above methods can only reflect the concentration of PM2.5 under specific conditions.

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