System and method for two-stage cryogenic on-line enrichment, concentration and sampling of volatile organic compounds in atmosphere
A volatile organic compound and sampling system technology, applied in sampling, sampling device, preparation of samples for testing, etc., can solve the problems of low time efficiency, unable to meet the needs of detection requirements for atmospheric chemical change process research, and achieve sufficient capture, The effect of improving the collection efficiency
Pending Publication Date: 2018-10-09
GUANGZHOU HEXIN INSTR CO LTD
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However, adsorbent sampling has always had problems with the adsorption and desorption efficiency of components, and the time efficiency is low. Moreover, this method can only be used for offline sampling and injection, which cannot meet the needs of on-site online detection and the research needs of atmospheric chemical change processes.
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[0033] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. Preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the understanding of the disclosure of the present invention more thorough and comprehensive.
[0034]It should be noted that when an element is referred to as being “fixed” to another element, it can be directly on the other element or there can also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present.
[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as ...
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Abstract
The invention discloses a system and a method for two-stage cryogenic on-line enrichment, concentration and sampling of volatile organic compounds in atmosphere. The system for two-stage cryogenic on-line enrichment, concentration and sampling of the volatile organic compounds in the atmosphere comprises a two-channel gas capturing system, a two-stage cryogenic concentration system, an on-line sample analyzing system, an ultra-rapid heating circuit system, a heat-preserving sample-injection gas circuit system and a reverse-purging gas circuit system, wherein the two-stage cryogenic concentration system comprises a cryogenic cavity; the two-channel gas capturing system comprises two gas capturing channels which can be switched to capture the volatile organic compounds; the heat-preserving sample-injection gas circuit system comprises a sample injection and introduction pipeline; two second-stage capturing pipes can be switched to communicate with the sample injection and introduction pipeline; the sample injection and introduction pipeline communicates with the on-line sample analyzing system; the ultra-rapid heating circuit system is used for controlling temperatures of first-stagecapturing pipes and the second-stage capturing pipes; and the reverse-purging gas circuit system is used for purging capturing pipes. The system provided by the invention can meet the demands of on-site on-line detection.
Description
technical field [0001] The invention relates to the field of gas enrichment, in particular to a two-stage cryogenic on-line enrichment and concentration sampling system and method for atmospheric volatile organic compounds. Background technique [0002] Volatile organic compounds are ubiquitous in the atmosphere and are key precursors for the formation of tropospheric atmospheric ozone and secondary organic aerosols, which can lead to the generation of atmospheric photochemical smog and cause health damage to animals and plants; they can also directly enter the human body and cause harm. The current sampling method for atmospheric volatile organic compounds is mainly to use adsorbents for off-line sampling, and then use a thermal desorber for desorption and sampling. However, adsorbent sampling has always had problems with the adsorption and desorption efficiency of components, and the time efficiency is low, and this method can only be used for offline sampling and injectio...
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IPC IPC(8): G01N1/24G01N1/40G01N1/42
CPCG01N1/24G01N1/4022G01N1/42Y02A50/20
Inventor 吴曼曼乔佳谭国斌粘慧青燕志奇吕金诺
Owner GUANGZHOU HEXIN INSTR CO LTD