Abstract：This paper introduces the principle of detecting nitrogen oxides by chemiluminescence method and the basic gas circuit structure of NOx analyzer. Starting with the gas circuit diagram of nitrogen oxygen conversion efficiency inspection, the gas composition of each step is analyzed, and the calculation formula of nitrogen oxygen conversion efficiency inspection is obtained. The calculation is carried out with an inspection example. According to the inspection data, the change trend of nitrogen oxygen conversion efficiency is obtained, and the precautions for nitrogen oxygen conversion efficiency inspection are put forward.
2023, Vol. 33 