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A system and method for measuring chemical components of particulate matter

A measurement system and technology of particulate matter, applied in the field of particle chemical composition measurement system, can solve the problems of inability to measure the inorganic chemical composition of particulate matter, inability to accurately obtain the chemical composition of particulate matter, etc.

Active Publication Date: 2020-10-27
INST OF CHEM CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above analysis, the present invention aims to provide a system and method for measuring the chemical composition of particulates, which can at least solve one of the following technical problems: (1) the existing systems can only measure the organic chemical components of particulates, but cannot measure the organic chemical components of particulates. Inorganic chemical composition; (2) The existing system cannot accurately obtain the chemical composition of particles with a particle size of less than 50nm

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  • A system and method for measuring chemical components of particulate matter

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Embodiment 1

[0040] A specific embodiment of the present invention discloses a particle chemical component measurement system, such as figure 1 As shown, it includes a charging unit, an enrichment unit, a thermal desorption unit and a detector 14 connected in sequence. The charging unit includes a charger 10 for charging the particles. Exemplarily, the discharge source of the charger 10 in this embodiment may be a radioactive source, a soft X-ray source, a corona discharge source, an electrospray ionization source or a dielectric barrier discharge. The enrichment unit enriches the charged particles through electrical enrichment.

[0041] During implementation, the particulate matter in the atmosphere is charged after passing through the charger, and the charged particulate matter enters the enrichment unit for enrichment. After enriching to a certain amount, the enriched particulate matter enters the thermal desorption unit to volatilize or thermally decompose into gas, and the gas enters...

Embodiment 2

[0063] Considering that some particles may be positively charged and the other part may be negatively charged, and a high-voltage power supply can only use positive high-voltage mode or negative high-voltage mode, and cannot use both positive and negative high-voltage modes at the same time, therefore, the enrichment part can only be enriched. Positively charged particles or negatively charged particles, cannot enrich positively charged particles and negatively charged particles at the same time. Based on the above considerations, the number of the high-voltage power supply and the enrichment part in this embodiment is two, each enrichment part is connected to a high-voltage power supply, and the two high-voltage power supplies adopt different high-voltage modes, so the two enrichment parts can be Particles of different charged types are enriched separately, thereby improving the enrichment efficiency of the enrichment part. Preferably, there may be more than two high-voltage ...

Embodiment 3

[0066] Another specific embodiment of the present invention discloses a method for measuring the chemical composition of particulate matter, comprising the following steps:

[0067] (1) Particles are charged after entering the charger;

[0068] (2) Charged particles enter the enrichment unit for electrical enrichment;

[0069] (3) The enriched particles are thermally decomposed into gases;

[0070] (4) The gas obtained by thermal decomposition enters the detection unit for detection.

[0071] The specific process is as follows:

[0072] The particles sampled by the sampler enter the particle charger 10 , and further pass through the particle filter 11 for particle size screening, and the nanoparticles with a specific particle size enter the collection chamber 5 . At the same time, the gas in the first gas source 16 is controlled by the third flow controller 21 and enters the collection chamber 5 through the air inlet 19 .

[0073] Through the electric motor 2 or manual con...

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Abstract

The invention relates to a particulate matter chemical component measurement system and method and belongs to the field of environment monitoring technologies. Through the measurement system and method, the problems that in the prior art, only organic chemical components of particulate matter can be measured, inorganic chemical components of the particulate matter cannot be measured, and the chemical components of the particulate matter with the particle size smaller than 50nm cannot be accurately obtained are solved. The particulate matter chemical component measurement system comprises a charging unit, an enrichment unit, a thermal desorption unit and a detection unit, all of which are sequentially connected; the charging unit comprises a charger used for electrifying the particulate matter; and the enrichment unit enriches the electrified particulate matter through electric enrichment. Through the measurement system and method, determination of the chemical components of the particulate matter with the particle size smaller than 50nm is realized.

Description

technical field [0001] The invention relates to the technical field of environmental monitoring, in particular to a system and method for measuring chemical components of particulate matter. Background technique [0002] Atmospheric fine particles (PM2.5) are the main pollutants that cause haze pollution. Even in heavy pollution days, the number concentration of nanoparticles still accounts for more than 60% of the total concentration. Online monitoring of nanoparticles (particle size less than 50nm) in the atmosphere It is the basis for studying the source of atmospheric nanoparticles and their physical and chemical changes in the atmosphere. [0003] The existing on-line measurement technology generally adopts the method of concentrating the particles through an aerodynamic lens or a capillary, and then using laser or heating to gasify them for detection, or first collecting them through a filter membrane, and then using a heated air flow to evaporate them. Larger particl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/00
CPCG01N15/00G01N2015/0038
Inventor 王炜罡张人一彭超刘明元葛茂发
Owner INST OF CHEM CHINESE ACAD OF SCI
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