An Efficient Online Monitoring System for Volatile Organic Compounds

Abstract

The invention discloses a high-efficiency volatile organic matter online monitoring system. The high-efficiency volatile organic matter online monitoring system comprises a sampling probe system, a back flushing system, a preprocessing system, an online chromatographic instrument, a PLC control system, a hydrogen generator, an air generator, a high-purity nitrogen generator, a data processing system and a data acquisition instrument, wherein the online chromatographic instrument is in communication connection with the data processing system, the data processing system is respectively in communication connection with the data acquisition instrument and the PLC control system, and the PLC control system is respectively in communication connection with the sampling probe system, the back flushing system, the preprocessing system, the hydrogen generator, the air generator, the high-purity nitrogen generator and the DCS. By adopting the high-efficiency volatile organic matter online monitoring system, not only can a content of volatile organic matters contained in waste gas be accurately measured, but also dust attached inside a probe and at the outer side of a filter can be effectively removed in a blowing manner; and moreover, condensed water can be avoided, the measurement accuracy can be effectively improved, and meanwhile the entire processing period is relatively short.

Description

technical field [0001] The invention relates to the technical field of online monitoring systems, in particular to an efficient online monitoring system for volatile organic compounds. Background technique [0002] With the development of the economy, there are more and more types of enterprises, and among many enterprises, the emissions of some enterprises will seriously pollute the environment, such as oil refining enterprises, pharmaceutical enterprises, spraying enterprises, chemical enterprises, automobile enterprises, semiconductor enterprises, manufacturing enterprises, etc. Leather companies, foundry companies, and oil storage, transportation, and gas stations, etc., the exhaust gas emitted contains a large amount of benzene series or non-methane total hydrocarbons or other characteristic volatile organic compounds. In order to reduce the volatile organic compounds in the exhaust gas For the content of volatile organic compounds, an exhaust gas treatment device is in...

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Problems solved by technology

[0002] With the development of the economy, there are more and more types of enterprises, and among many enterprises, the emissions of some enterprises will seriously pollute the environment, such as oil refining enterprises, pharmaceutical enterprises, spraying enterprises, chemical enterprises, automobile enterprises, semiconductor enterprises, manufacturing enterprises, etc. Leather companies, foundry companies, and oil storage, transportation, and gas stations, etc., the exhaust gas emitted contains a large amount of benzene series or non-methane total hydrocarbons or other characteristic volatile organic compounds. In order to reduce the volatile organic compounds in the exhaust gas For the content of volatile organic compounds, an exhaust gas treatment device is installed in the exhaust flue. Although the installation of the exhaust gas treatment device reduces the content of volatile organic compounds in the exhaust gas, it is difficult to clearly understand the actual content of volatile organic compounds in the exhaust gas. Enterprise personnel set up an online monitoring system for monitoring the content of volatile organic compounds in the exhaust gas at the outlet of the exhaust gas treatment device

[0003] The prior art volatile organic compound online detection system has the following disadvantages: 1. The sampling probe system of the volatile organic compound online detection system collects through the probe. Since the temperature of the probe is low, it is inevitable that there will be Liquid water is formed, and then it is necessary to set up a water removal link, and volatile organic compounds are easily lost in the water removal link, which seriously affects the accuracy of the measurement; 2. The probe and filter of the sampling probe system are easily blocked during the sampling process , seriously affected the sampling work of the sampling probe system, and brought great inconvenience to the sampling work of the sampling probe; Most of the outside air is cold air, which is easy to produce condensed water, which seriously affects the accuracy of the measurement; 4. The overall structure of the pretreatment system used in the online detection system for volatile organic compounds in the prior art is complex, and the entire pretreatment cycle is relatively long. It not only affects the measurement accuracy, but also reduces the measurement efficiency, which brings great inconvenience to the detection work of the entire online detection system.

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