Sampling method and device suitable for low-concentration particles

Abstract

The invention belongs to the technical field of atmospheric environment sampling, and particularly relates to a sampling method and device suitable for low-concentration particles. The device comprises a sampling box, a folding pipe is arranged in the sampling box, and hydraulic rods are connected to the front side and the rear side of the folding pipe. The top of the sampling pipe is provided with the folding pipe which can be changed into a snake shape through pulling of the two hydraulic rods; the controller controls the two hydraulic rods to work at the same time; the hydraulic rod pulls the folding pipe to be snake-shaped; therefore, the gas entering the folding pipe can have a longer moving path; when the gas passes through the bent part of the snake-shaped folding pipe,the gas can make full contact with the filter bristles in the folding pipe, particles in gas are filtered out by the filter bristles, finally the particles collected in the folding pipe and the particles on the filter membrane are concentrated, the total amount of the particles contained in the sampled gas is obtained, the collection effect of the particles in the gas is better, and the collection precision isimproved.

Description

Technical field [0001] The invention belongs to the technical field of atmospheric environment sampling, and specifically is a sampling method and device suitable for low-concentration particulate matter. Background technique [0002] With the frequent occurrence of sandstorms and haze weather, air pollution has attracted more and more attention. The detection of air quality is also particularly important. Monitoring, analysis and research of particulate matter in the air is the focus of current environmental protection work. The measurement standard of particulate matter in conventional flue gas (such as GB16157-1996) stipulates that the flue gas temperature is (70~80). ) ℃ above (all obviously higher than the water dew point temperature of about 50 ℃), the measurement procedure of particulate matter in the flue gas environment without liquid water with appropriate humidity, and the measurement concentration is usually greater than 50mg / m3 (standard state dry flue gas), measurem...

AI Technical Summary

Problems solved by technology

[0003] Because the existing sampling device for gas particles rapidly samples the gas, when the gas with higher intensity passes through the filter membrane, the pores of the filter membrane will become larger, which will cause a part of the particles to pass through the filter membrane without being filtered out. , which in turn will cause a reduction in sampling accuracy. In view of this, the present invention provides a sampling method and device suitable for low-concentration particulate matter, which can collect particulate matter passing through the filter membrane when sampling gas particulate matter, and improve collection efficiency. precision

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