Method and device for fast detection of aerosol particle concentration and size distribution

Abstract

The invention discloses a method and a device for fast detection of aerosol particle concentration and size distribution. The method comprises the following steps of: forming a gas flow containing aerosol particles; enabling the gas flow to pass through at least one corona area so that at least partial aerosol particles to be detected in the gas flow are negatively charged; before the actual field measurement, measuring the length L of the corona area, pipe diameter H and gas flow speed v0, searching or measuring the density d of the particles, conducting a calibration experiment for the aerosol particle gas flow having a determined diameter D, then performing an actual measurement and finally calculating the number n of the particles at each level according to the formula YN=22N-2kD2 (22n-2-21-n) nN, in which YN, k, D are known; multiplying the number n of the particles at each level by a single mass of the particles at each level, and then summing the products to obtain a concentration value of the total particles in the gas flow. By the method provided by the invention, the size distribution proportion and the concentration of the aerosol particles in the air or the pipe gas flow can be detected conveniently, sensitively and quickly.

Description

technical field [0001] The invention relates to a method for detecting aerosol particles, in particular to a method and a device for detecting the concentration and size distribution of aerosol particles. Background technique [0002] Many aerosol particles have obvious harm to the human body, such as non-edible oil (coal tar, wood tar, mineral oil and natural asphalt, etc.) heated oil smoke will cause serious environmental pollution. Take asphalt oil fume as an example, when processing, manufacturing and using asphalt, coal, petroleum and asphalt-containing substances, complex asphalt fume aerosols will be produced during the process of heating and burning. Due to serious air pollution, the country has Strict emission standards (GB16297-1996) are stipulated. The existing pollution source is 80mg / m3, and the new pollution source is 40mg / m3 3 . At present, there is a lack of complete means to detect the concentration of this kind of oil mist. The Chinese patent No. 022211...

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Problems solved by technology

[0006] The present invention provides a rapid detection method and device for aerosol particle concentration and size distribution, to solve the problem of accurate detection of particle concentration when the size distribution of aerosol particles is relatively dispersed, and the particle size cannot be detected by existing detection methods The problem of distribution ratio

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