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Collection device of fine atomospheric aerosol particle and gaseous precursor

An atmospheric aerosol and collection device technology, which is applied to sampling devices and other directions, can solve the problems of no simple and practical finished product collection device, no correlation of atmospheric air inlets, affecting the collection efficiency of annular tubes, etc., and achieves low manufacturing cost and reduced sampling. Error, the effect of simple device structure

Inactive Publication Date: 2015-04-29
NANJING UNIV OF INFORMATION SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method effectively solves the problem of collecting aerosol fine particles and gaseous precursors in the atmosphere, but there are still shortcomings: 1. The atmospheric air inlet is not cut and processed, and all aerosols and gases are passed through However, aerosol particles with different particle sizes have different diffusion coefficients at the same flow rate, so it cannot be guaranteed that the collection of the annular tube is completely gas; 2. When the annular tube is coated, there is also a coating on the outer annular surface, which will affect the annular tube. The calculation of the actual collection efficiency of the tube; 3. The ring tube used needs to be replaced in its entirety during continuous sampling
In addition, this method does not have a convenient and practical finished product collection device at present

Method used

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  • Collection device of fine atomospheric aerosol particle and gaseous precursor
  • Collection device of fine atomospheric aerosol particle and gaseous precursor
  • Collection device of fine atomospheric aerosol particle and gaseous precursor

Examples

Experimental program
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Embodiment 1

[0015] A collection device for atmospheric aerosol fine particles and gaseous precursors provided by the present invention includes five parts: pre-filter device, gas collection device, aerosol collection device, flow control device and power device; the pre-stage filter device is a sharp cutting Cyclone separator 11; gas collection device is two annular diffusion pipes connected in series: collecting alkaline gas annular diffusion pipe 12 and collecting acid gas annular diffusion pipe 13; aerosol collection device is an aerosol impactor 14; flow control device is A flow controller 16; the power unit is an air pump 17; each device is sequentially connected with a connecting pipe 15.

[0016] The annular diffuser tube is made of glass material, including an outer tube 21 and an inner tube 22: the inner tube 22 is a plug-in type, a glass tube with both ends closed, the head is tapered, and the tail is connected to the outer tube through the piston 221 21 frosted connection, the ...

Embodiment 2

[0020] When sampling, the air pump 17 draws air to allow the aerosol particles in the atmosphere to pass through the sharp-cut cyclone separator 11 to filter the large particles; then the remaining particles and gas enter the annular diffusion tube, and when passing through the annular diffusion tube, the air flow is laminar flow. Since the diffusion coefficient of gas molecules in laminar flow is much greater than that of particles, gaseous pollutants are collected through the diffusion process, while aerosol particles enter the next device together with the sampled airflow. Different compounds have different adsorption efficiencies for different gases, so different gaseous pollutants can be collected by coating the sampling section 224 with different compounds. Adopt citric acid and Na 2 CO 3 As a gas-absorbing coating material, the basic gas NH in the atmosphere is adsorbed by the coating 3 and acid gas H 2 SO 4 、HNO 3 , HONO, and HCl; then the remaining aerosol partic...

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Abstract

The invention discloses a collection device of fine atomospheric aerosol particles and gaseous precursors. A Ruiqie cyclone separator is arranged at an atmosphere inlet to filter out larger-grain size aerosol particles in the atmosphere from a sample to prevent the large particles from influencing the collection result in the collection process. An inner tube of an annular diffusion tube adopts a drawable or pluggable type, thereby reducing errors caused by that an outer tube is also coated when the traditional annular diffusion tube is coated, and improving the collection efficiency. The collection device is practical and convenient, low in cost and high in collection efficiency, and can collect gaseous pollutants and aerosol particles.

Description

technical field [0001] The invention relates to a collection device for the mass concentration and chemical composition of atmospheric aerosol fine particles and gaseous precursors, in particular to a diffusion tube for collecting gaseous precursors. Background technique [0002] In recent years, regarding the mass concentration and chemical composition of atmospheric aerosol fine particles, and the basic gas NH in the atmosphere 3 and acid gas H 2 SO 4 、HNO 3 , HONO and HCl acquisition devices have been greatly improved, such as Li Lizheng described in detail the circular diffusion Fabrication of tubes, annular diffuser tubes and their application in atmospheric sampling. C Perrino et al. published in 2001 Monitoring acidic air pollutants near Rome by means of diffusion lines: development of a specific quality control procedure (Atmospheric Environment, 35(2):331-341) that the annular diffusion tube - laminated film is very Efficient method for simultaneous collection ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/24
Inventor 朱彬王红磊张泽锋沈利娟
Owner NANJING UNIV OF INFORMATION SCI & TECH
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