On-line Monitoring System for Measuring Respirable Particulate Matter in Air

Abstract

The invention provides an online monitoring system for measuring inhalable particles in air for metering and collecting the inhalable particles by the particle volume. The online monitoring system comprises an air sample collection unit, an air sample liquidation unit, a pH value detection unit, an air blowing unit, a primary counting unit, an ionization chamber, a secondary counting unit and an alarm information display unit. The pH value detection unit is used for detecting whether the present air quality reaches necessary safety indexes; more accurate and comprehensive inhalable particle indexes can be obtained by use of an image processing method and an electric field ionization method; the first hand information of air pollution can be displayed more comprehensively on the alarm display unit so that the concentration information of the inhalable particles can be obtained more accurately and reliable reference can be provided for people to go out during production and in daily life.

Description

technical field [0001] The invention relates to the technical field of air quality monitoring, in particular to an online monitoring system for measuring inhalable particulate matter in the air. Background technique [0002] Atmospheric inhalable particulate matter has a significant impact on human health, especially atmospheric inhalable particulate matter that can enter the alveoli with an aerodynamic diameter of less than 2.5 microns (PM2.5), which can cause respiratory diseases and lung function damage to humans. In order to correctly detect the concentration of inhalable particulate matter in the atmosphere, people have invented and created a variety of detection methods and detection equipment in recent years, including the traditional classic filter membrane weighing method: this method takes samples at a specified flow rate and captures the particulate matter in the air. It is collected on a filter membrane with a certain diameter and porosity, and then by weighing t...

AI Technical Summary

Problems solved by technology

However, in the measurement process, there are disadvantages such as complicated operation, time-consuming, and more equipment. In addition, the test results cannot be displayed immediately, and steps such as weighing and calculation are required.

Although the light scattering method can realize online and rapid detection, the signal detected by this technology itself mainly contains particle number and particle size information, but does not contain particle mass information. Further experiments are required to obtain the mass concentration of atmospheric respirable particles. Obtain the density of the measured particles, thus increasing the complexity of the measurement

The output signal of β-ray absorption method is relatively complicated, and it needs professional personnel to operate well

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