A chemical enterprise generates waste gas containing volatile organic compounds (VOCs) during production, which needs to be discharged through a chimney pipeline. In order to grasp the concentration of VOCs in the waste gas in real time and ensure that the emission meets environmental protection standards, the enterprise has installed an online gas pretreatment device.

The sampling probe of the device goes deep into the chimney pipeline to collect the waste gas. After the gas is subjected to dust removal, dehumidification and other treatments by the pretreatment system, it is transmitted to the monitoring instrument. The staff can intuitively see the VOCs concentration value through the instrument screen. For example, a certain monitoring showed that the concentration was 4.4 ppm, which was within the normal emission range. The application of this device enables the enterprise to realize the real-time monitoring of waste gas emission, helps it meet environmental protection requirements, and also provides reliable data support for the supervision of environmental protection departments.