Wet type ultraviolet-absorption-method online detection device for micro-nano aerosol of production environment

Abstract

In order to lower the requirements of online detection technologies on objective factors, reduce the structural complexity and cost of detection equipment, improve the accuracy of detection on high-humidity or semi-volatile micro-nano aerosols and efficiently obtain micro-nano aerosol particle samples, the invention provides a wet type ultraviolet-absorption-method online detection device for micro-nano aerosol. Through the implementation of the invention, the wet type ultraviolet-absorption-method online detection device has the advantages that the effective online detection on high-temperature, high-humidity or semi-volatile micro-nano aerosols can be realized; in view of that ultraviolet absorption detection has characteristic detection wavelength, detection aiming at production dust can be effectively carried out without interference from other sources of dust; the on-site sampling of the micro-nano aerosol can be realized, so that the further detection on the physical and chemical properties of the aerosol is facilitated; the online detection cost of the micro-nano aerosol can be effectively reduced.

Description

technical field [0001] The invention belongs to the on-line detection technology of micro-nano aerosol, in particular to a device for on-line detection of micro-nano aerosol concentration in the air by wet method and ultraviolet absorption method in a production environment. Background technique [0002] Micro-nano aerosol refers to a multi-phase system composed of solid or (and) liquid particles and gas carriers with at least one-dimensional particle size of micron, submicron or nanometer scale floating and flying in the air. Micro-nano aerosols can enter the organism through breathing, skin contact, etc., and participate in the digestive system and blood circulation system of the organism, thus causing great harm to the health of the organism. [0003] At present, the principles of on-line detection of micro-nano aerosols in the production environment basically belong to the weighing method or the light scattering method. Among them, the filter weighing method is the most...

AI Technical Summary

Problems solved by technology

TEOM oscillating microbalance measures the aerosol concentration by converting the frequency into an electrical signal according to the relationship between the mass of aerosol particles accumulated on the filter membrane and the oscillation frequency of the microbalance. Its disadvantage is that the device is relatively large and not suitable for carrying Go to the site for testing, and the price is relatively expensive; some measuring instruments based on light scattering use aerosol particles to cause light scattering when passing through the laser irradiation area, and detect the concentration of dust by measuring the intensity of scattered light, and the superposition of scattered light It will cause large errors in the dust measurement results, and the optical system is more complicated

[0004] In the existing online detection method based on the filter membrane weighing method, there are mainly the following problems: high precision requirements for microbalances; detection data are greatly affected by objective factors; detection accuracy for high humidity or volatile aerosols Low

Although this equipment achieves efficient collection of micro-nano dust in the air, it only obtains dust particle samples, and offline detection is still required to obtain the concentration value of dust in the air, and the measured data has a hysteresis

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