Abstract For the first 660MW ultra-supercritical circulating fluidized bed boiler in China, the original NO X emission concentration would be controlled and maintained below 50mg/Nm 3 , by improving the uniformity of bed temperature and bed pressure, strengthening the secondary air fractional combustion, optimizing the combustion temperature and operating oxygen and so on. Meanwhile, selective non-catalytic reduction (SNCR) technology with urea as reducing agent is selected as the auxiliary method to ensure the boiler achieves ultra-low NO X emission under full load conditions.
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