Method for inverting mass concentration of atmospheric particulates based on flight time of particulates

Abstract

The invention relates to a method for inverting the mass concentration of atmospheric particulates based on the flight time of the particulates. The mass concentration of the particulates can be inverted according to the flight speed and the sampling flow on the basis of an aerodynamic particulate spectrometer. According to the work principle of the aerodynamic particulate spectrometer, the particulates with different particle sizes have only speed up at any one point on an airflow track after the particulates pass through an accelerating nozzle, so the flight speed of particles can be obtained through the flight time. The relationship between the flight speed and the mass of the particles can be obtained according to a momentum conservation theorem and aerodynamic and hydromechanical principles, so the mass concentration of the particulates can be inverted through the flight speed and the sampling flow. The method provided by the invention can be used for inverting the mass concentration of the atmospheric particulates according to the dynamic feature of the particulates and provides an inversion algorithm capable of measuring the mass concentration of the atmospheric particulates accurately, in real time and on line.

Description

technical field [0001] The invention relates to a real-time measurement method for the mass concentration of atmospheric particulate matter, and belongs to the technical field of atmospheric environment monitoring. Background technique [0002] In recent years, with the frequent occurrence of smog in most parts of our country, especially in developed cities and regions, people pay more and more attention to air quality. The main reason for the formation of haze weather is the increase in the concentration of atmospheric particulate matter, especially the increase in the concentration of PM2.5, which causes adverse effects such as deterioration of air quality and sharp drop in visibility. The particle size of particulate matter in haze weather is closely related to human health, and it determines the location and deposition amount of particles that eventually enter the respiratory tract. Toxic and harmful particles in the haze weather are scattered in the air, causing varyin...

AI Technical Summary

Problems solved by technology

Oscillating balance method can directly measure the concentration of particulate matter, which has nothing to do with particle size, color, etc., but it is greatly affected by sampling temperature, humidity, vibration, noise, etc., especially the measurement error caused by the loss of volatile organic compounds in atmospheric particulate matter during the sampling process larger

The Beta ray method has nothing to do with the type, particle size, shape, color and chemical composition of the particles, but only with the quality of the particles, but it is greatly affected by the individual differences of the radiation source and filter paper.

In addition, the vibration balance method and the Beta ray method must be used with PM10, PM2.5 and other cutters, and the error of the cutter will also cause errors in the measurement results

Moreover, the oscillating balance method and the Beta ray method cannot give the number concentration and particle size distribution information of each particle size of atmospheric particulate matter, and these two parameters are one of the important parameters that affect human health

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