A device for realizing gas cold trap trapping and thermal desorption

Abstract

The invention relates to the technical field of environment monitoring, and discloses a device for realizing gas cold trapping and thermal desorption. The device has the advantages that a structure of brazing a thermocouple type temperature sensor in a heating wire is adopted; the goal of precisely controlling the temperature rise speed and the temperature constant point in a temperature compensation mode can be realized; the characteristics of fewer heating cold points and low activity are also realized, so that the phenomena of heating nonuniformity and occurrence of reactions such as catalytic decomposition reactions and oxidization effects are avoided; the safety and the service life of the device are guaranteed; higher practicability is realized.

Description

technical field [0001] The invention relates to the technical field of environmental monitoring, in particular to a device for realizing gas cold trap capture and thermal desorption. Background technique [0002] In environmental monitoring equipment such as gas concentrators, in order to perform qualitative and quantitative analysis of target substances such as volatile organic compounds, it is necessary to configure a cold trap trap and thermal desorption device to capture target substances in the sample gas. The basic principle It is to enrich the target substance at low temperature first, and then volatilize the target substance at high temperature for subsequent monitoring. [0003] However, the existing cold trap trap and thermal desorption device still has the following problems: (1) the temperature control accuracy is not high, and it is inconvenient to accurately control the temperature rise rate and temperature constant point of the cold trap trap and thermal desor...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of the aforementioned existing cold trap trap and thermal desorption device, the present invention provides a device for realizing gas cold trap trap and thermal desorption, adopting the structure of brazing thermocouple type temperature sensor in the heating wire, Not only can the precise control of the heating rate and constant temperature point be achieved through temperature compensation, but also has the characteristics of less heating cold spots and low activity, so as to avoid the phenomenon of uneven heating and reactions such as catalytic decomposition and oxidation, and guarantee The safety and service life of the device, with stronger practicability

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