VOC (Volatile Organic Compound) concentration online monitoring device and VOC concentration online monitoring method thereof

Abstract

The invention relates to a VOC (Volatile Organic Compound) concentration online monitoring device which comprises a gas sampling unit, a gas analyzing unit, a VOC real-time detection unit and a control and data processing unit. A VOC concentration online monitoring method specifically comprises the following monitoring steps of gas sampling; gas component separation and concentration detection; VOC real-time online monitoring; VOC real-time emission concentration calculation and output. According to the device and the method thereof, a gas detector for real-time detection and a gas chromatograph used for performing component analysis are combined, the gas chromatograph is utilized for determining the components of to-be-detected gas and the ratio of the components, thus to calculate and analyze a result obtained by real-time detection through the gas detector, so as to obtain the real-time emission concentration of VOCs; therefore, the device and the method thereof can perform real-time online monitoring on the concentration of the VOCs from industrial emission, and can perform qualitative and quantitative analysis on to-be-detected gas with known components; not only can the total amount of the VOCs be detected, but also the content of a specific component or a specific types of components can be obtained.

Description

technical field [0001] The invention relates to an on-line monitoring device and a method thereof, in particular to an on-line VOCs concentration monitoring device and a method thereof. Background technique [0002] VOCs is the English abbreviation of Volatile Organic Compounds (Volatile Organic Compounds). According to the definition of the World Health Organization (WTO), it means that the melting point is lower than room temperature and the boiling point is 50 ° C ~ 260 ° C, and it exists in the air in the form of vapor at room temperature. A class of organic compounds. [0003] VOCs include alkanes, aromatic hydrocarbons, esters, aldehydes, etc. Man-made emissions mainly come from incomplete combustion processes in production and life and industrial fields involving the volatilization and dissipation of organic products, such as petrochemical industry and furniture coating industry , printing and dyeing industry, etc. The main hazards caused by VOCs are mainly manifest...

AI Technical Summary

Problems solved by technology

However, for gases with unknown components, the detection results of the photoionization gas detector PID can only give a rough estimate of the total amount of VOCs, and cannot be accurately quantitatively detected.

[0007] At present, for mixed gases with unknown components, especially in applications where the components change with the switching of production processes, there is no good solution for real-time on-line monitoring and quantitative analysis of VOCs

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