Enrichment and pre-separation system for VOCs in atmosphere

A pre-separation and enrichment technology, which is applied in the field of VOCs enrichment and pre-separation systems in the atmosphere, can solve the problems of low multi-concentration, complex characteristics, high test range and precision requirements of chromatographs, and achieves simple operation and high adsorption efficiency. , to achieve the effect of self-cleaning

Pending Publication Date: 2020-08-11
苏州冷杉精密仪器有限公司
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Problems solved by technology

[0003] Under normal circumstances, there are many types of VOCs in the ambient air and the concentration is low. It needs to be enriched and concentrated first to meet the requirements of analytical instruments. However, due to the variety of VOCs and complex characteristics, especially for olefins, which are difficult to capture The enrichment and concentration effic...

Method used

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  • Enrichment and pre-separation system for VOCs in atmosphere
  • Enrichment and pre-separation system for VOCs in atmosphere

Examples

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Embodiment 1

[0048] This embodiment provides an enrichment and pre-separation system for VOCs in the atmosphere, including a sampling device, a water removal device, an enrichment and pre-separation device, and a sampling device. Such as figure 1 As shown, the sampling device includes an atmospheric sampler 11, a first control valve 12, and a first gas flow controller 13, the atmospheric sampler 11 is connected to the first gas flow controller 13, and the atmospheric sampler 11 is connected to the first gas flow controller 13. A first control valve 12 is provided between the first gas flow controllers 12 . The water removal device includes a first cold trap 14 , and the first cold trap 14 is connected with the first gas flow controller 12 .

[0049] Such as figure 1 As shown, the enrichment and pre-separation device includes a second cold trap 2, a third cold trap 3, a fourth cold trap 4, a second gas flow controller 23, a third gas flow controller 33, a second control Valve 24, the thi...

Embodiment 2

[0058] This embodiment provides a system for enriching and pre-separating VOCs in the atmosphere, and its working method includes three processes: adsorption concentration, classified capture, and equipment self-cleaning.

[0059] (1) Adsorption and concentration:

[0060] Such as figure 1 As shown, close the fourth control valve 61 and the fifth control valve 51; open the first control valve 12, the second control valve 24, the third control valve 34, and the air pump 15, and open the low temperature state of the low temperature environment box 7 The sample gas in the atmospheric sampler 1 enters the first cold trap 14 through the first control valve 12 and the first gas flow controller 13, and the water vapor in the sample gas condenses on the stainless steel pipe of the first cold trap, thereby realizing for the purpose of removing water vapor. The sample gas after water vapor removal is divided into two paths, one path passes through the second control valve 24, the seco...

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Abstract

The invention discloses an enrichment and pre-separation system for VOCs in atmosphere. The system comprises a sampling device, a water removal device, an enrichment and pre-separation device and a sampling device. The enrichment and pre-separation device comprises a second cold trap, a third cold trap, a fourth cold trap, a second gas flow controller and a third gas flow controller. According tothe enrichment and pre-separation system for VOCs in the atmosphere, VOCs in sample gas can be synchronously adsorbed, concentrated and preliminarily separated, and the adsorption efficiency is high.VOCs subjected to preliminary adsorption and separation are respectively classified and captured through different desorption and capture channels, so that pre-separation of various VOCs is realized.Self-cleaning of the equipment can be achieved, operation is easy, and no extra auxiliary device is needed.

Description

technical field [0001] The invention relates to the technical field of atmospheric environment detection equipment, in particular to a system for enriching and pre-separating VOCs in the atmosphere. Background technique [0002] Volatile organic compounds (VOCs) in my country refer to organic compounds with a saturated vapor pressure greater than 70Pa at normal temperature and a boiling point below 260°C at normal pressure, or all organic compounds with corresponding volatility at a vapor pressure greater than or equal to 10Pa at 20°C. . Usually its main components include hydrocarbons, oxygen hydrocarbons, halogen-containing hydrocarbons, nitrogen and sulfur hydrocarbons, polycyclic aromatic hydrocarbons with low boiling points, etc. VOCs can cause respiratory diseases, can cause acute poisoning under the action of high-concentration pollutants, and undergo photochemical reactions under the action of sunlight to generate secondary pollutants, forming smog pollution. The ch...

Claims

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Application Information

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IPC IPC(8): G01N1/22G01N1/40
CPCG01N1/2202G01N1/2214G01N1/2273G01N1/4022G01N1/405G01N2001/4033
Inventor 徐强余超宋新
Owner 苏州冷杉精密仪器有限公司
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