1. The sampling unit collects the boiler tail gas, filters the dust once, and sends it to the pretreatment unit.

2. The pretreatment unit performs cooling, dehumidification and secondary dust removal on the gas, and the gas analysis unit detects and analyzes various flue gas concentrations.

3. Display the concentration of nitrogen oxides on the display screen in real time, and transmit data signals to remote computers, WeChat cloud platform for flue gas concentration monitoring and other terminals.