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Extended Abstract In recent years, domestic and overseas industrial boilers have achieved high thermal efficiencies up to 90%. Industrial boiler manufacturers and research institutes are working to increase the thermal efficiency and reduce carbon monoxide (CO) and nitrogen oxide (NOx) in a flue gas of boiler. Korea has been supporting subsidies for a low NOx burner when nitrogen oxides in flue gas are lower than 40 ppm (4% O2) for LNG burner, and NOx concentration for lowest certified burner at 2016 in Korea was 8.8 ppm. But the burner characteristics are changed due to a variation of surrounding environment, burner aging due to an operation and so on. Therefore NOx and O2 concentrations can be changed with an operation time of burner. By using Smart NOx Sensor (Continental AG) which can measure NOx and O2, the possibility of using the sensor for measuring the oxygen concentration and the NOx value simultaneously in a flue gas was confirmed in industrial boiler. The sensor precision was confirmed in a NOx and O2 standard gas before boiler installation. Results said that O2 and NOx output value of the sensor are 0.45 % and 49 ppm in a case of O2 0 % and NOx 48.8 ppm standard gas. With the Smart NOx sensor, flue gas concentrations in an industrial boiler were measured and compared by conventional flue gas analyzer (Testo 350). The smart NOx sensor has faster responsibility than the flue gas analyzer due to an insert type characteristic. With the sensor, real-time control O2 and NOx of flue gas can be obtained by using flue gas recirculation, combustion air fan control system and burner geometry control. This work was conducted under framework of the research and development program of Korea Institute of Energy Technology Evaluation and Planning (No. 20152020105290) and Korea Institute for Advancement of Technology (NO. 10070223).

NOx and O2 Measurements by using Smart NOx Sensor for Industrial Boiler