In order to explore the influence of operating oxygen levels on the combustion efficiency and NOx generation characteristics of a double tangential boiler under low load conditions,this paper combines practical cases and conducts simulation and experimental research on the impact of operating oxygen levels (5.6％,6.0％,6.4％)on the combustion efficiency and NOx generation characteristics of a 1000 MW double tangential boiler under low load conditions.The simu-lation results show that under low load conditions,when the operating oxygen content increases from 5.6％ to 6.0％,the carbon content of boiler combustion fly ash significantly decreases and the NOx concentration increases.Further increasing the operating oxygen content to 6.4％ results in a relatively small decrease in carbon content in boiler combustion fly ash along with a slight increase in NOx .The on-site test results show that the operating oxygen content is controlled at around 6.0％,the carbon content of boiler combustion fly ash is low and the combustion efficiency is high,and the steam temper-ature can be maintained at a relatively good level.Considering all factors,it is recommended to control the operating oxy-gen content of boiler combustion at around 6.0％ under low load operating conditions,in order to achieve efficient combus-tion and low NOx generation.
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