Fixed pollution source VOCs online sampling, calibration and pretreatment system

Abstract

The invention relates to the related technical field of pollution source monitoring, in particular to a fixed pollution source VOCs online sampling, calibration and pretreatment system which comprises a sampling unit, a calibration device and a pretreatment system, and the sampling unit comprises a gas collection channel, a filter assembly, a mounting head, a pipeline connector and a heating structure. The gas collection channel is of a tubular structure; a pollution source VOCs online sampling, calibration and pretreatment system composed of a sampling unit, a calibration device and a pretreatment system is arranged, and the sampling unit is composed of a gas collection channel, a filter assembly, a mounting head, a pipeline connector and a heating structure. Therefore, the gas flowing into the gas collection channel is preheated through the heating structure, so that the sample gas is always kept in a constant high-temperature state, the loss of the sample gas caused by adsorption, condensation and the like is prevented, and the purpose of improving the sample detection accuracy is achieved.

Description

technical field [0001] The invention relates to the related technical field of pollution source monitoring, in particular to an on-line sampling, calibration and preprocessing system for fixed pollution source VOCs. Background technique [0002] VOCs (volatile organic compounds) mainly include hydrocarbons, oxygenated hydrocarbons, halogenated hydrocarbons, low-boiling polycyclic aromatic hydrocarbons and other types, and are one of the main pollutants in ambient air. The total amount of VOCs emissions and the difficulty of prevention and control are easy to cause photochemical pollution, atmospheric haze, and seriously endanger human health. VOCs mainly come from stationary pollution sources, involving many industries, such as petrochemical, pharmaceutical manufacturing, rubber manufacturing, paint manufacturing, electronics industry, etc. The online monitoring of VOCs from fixed pollution sources mainly realizes real-time monitoring of organic compounds emitted by various...

AI Technical Summary

Problems solved by technology

The exhaust gas in the flue has the characteristics of high temperature, high humidity, high dust, high corrosion, and strong adsorption. Therefore, in the process of sample collection and transmission, on the one hand, it is easy to produce condensed water, and some VOCs components dissolve in water, resulting in sample gas. If the condensed water enters the detector, it will greatly reduce the service life of the detector and cause damage to the detector; on the other hand, after long-term use, the particulate matter in the exhaust gas will cause blockage of the sampling probe and transmission pipeline, thus affecting the monitoring. Precision and accuracy, so it needs to be cleaned frequently

The online monitoring system generally uses a pump to pump the sample gas from the exhaust cylinder into the entire detection system, and the pump is located at the back end of the detection device. After the sample gas is drawn, the air pressure in the quantitative loop is in a negative pressure state, and the pressure is unstable, resulting in Differences in the sample volume will seriously affect the repeatability and accuracy of detection. For this reason, the present invention proposes a fixed pollution source VOCs online sampling, calibration and pretreatment system to solve the above problems

Images