Method for sampling ultrahigh flow aerosol and sampler

Abstract

The invention relates to a method for sampling ultrahigh flow aerosol and a sampler. The sampling method comprises the following steps of: pumping gas containing aerosol particles into the sampler; making the gas flow toward a collecting groove after being sprayed through a nozzle; and deviating the gas flow through the collecting groove, wherein particles with large particle diameters are collected onto a non-woven fabric of the collecting groove, and particles with small particle diameters move along with fluid along a flow line and are collected by a filtering material arranged below the collecting groove. In the invention, an impactor is adopted for capturing larger particles, and the pressure resistance on the filtering material is reduced, so that a vacuum pump with low power can be used, and the size and the weight of the sampler are reduced fundamentally. The invention further provides a method for reducing the pressure resistance of the filtering material by performing factional sampling with the impactor. An ultrahigh flow aerosol sampler which is detachable and is convenient to move is researched and developed by applying the method.

Description

technical field [0001] The invention belongs to environmental monitoring equipment, and in particular relates to a sampler used for sampling super-large-flow atmospheric aerosol. Background technique [0002] Atmospheric aerosol is the main form of many pollutants in the atmosphere, which has many adverse effects on human health. It is one of the key objects of environmental monitoring and research. Atmospheric environmental monitoring generally enriches its samples, and then measures its components content. Because the concentration of pollutants in the environment varies greatly, different sampling flows are required for enrichment. According to the technical requirements issued by the State Environmental Protection Administration (HJ / T374-2007 total suspended particulate matter sampler technical requirements and detection methods), the samplers are divided into medium flow samplers according to the flow rate (working point flow rate 6m 3 / h) and large flow sampler (work...

AI Technical Summary

Problems solved by technology

The existing problems are: First, due to the severe pollution of seasonal atmospheric particles in many areas of the country, the filter material is often blocked, and the sampling volume of the sample cannot meet the requirements. To overcome this situation, generally a higher power is used. A separate air pump not only increases the volume and weight of the sampler, but also increases energy consumption

The second is to use a high-power air pump, which leads to a large volume and weight of the sampler. Generally, it can only be installed fixedly, and it is difficult to change the sampling location, which affects its monitoring range.

The root cause of the above problems is that the resistance of the filter material in sampling is relatively large.

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