According to the sampling and measurement methods, it can be divided into three types: complete sampling measurement, dilution sampling measurement, and direct measurement.
The pollutant objects for online monitoring of VOCs in fixed pollution source exhaust gas usually include two categories: total VOCs emissions monitoring and VOCs component monitoring. The analytical techniques used mainly include sensor technology, spectroscopic technology, chromatographic technology, mass spectrometry technology, and other types; Although the standards and requirements vary from country to country, the basic principle of current monitoring equipment is FID. Due to different monitoring requirements for different pollutants, the pre-treatment of the system is also different, such as NDIR, Cutter, GC, etc. in non methane total hydrocarbons.
Each region has different standards and requirements. Taking Shanghai as an example:
(1) Non methane total hydrocarbons: Both methane and total hydrocarbons are required to be measured using the FID principle, which can be divided into catalytic combustion method and chromatographic method.
Advantages and disadvantages comparison: Catalytic combustion method has relatively fast speed and accurate data, but there are also issues with catalytic conversion efficiency; Chromatography can measure characteristic pollutants, but it also has problems such as slow response time and aging and deactivation of chromatographic columns. Brand representatives: SICK from Germany, Environment from France, ABB, Horriba, etc.
(2) Non methane total hydrocarbons (including characteristic pollutants such as benzene derivatives): At this time, only chromatography can be used for measurement. Chromatography can measure dozens of characteristic pollutants through chromatographic column separation technology. Representative brands: ABB, SIEMENS, SICK, Yokogawa, etc. Online monitoring of flue gas
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