Abstract
It requires that coal-fired generator units to meet ultra-low emission standards by 2020 in policy of environmental protection in China. Compared with pulverized coal boiler, circulating fluidized bed (CFB) boiler technology has the natural advantage of low NOX emission, which has the ability to directly realize ultra-low NOX emission inside the furnace. To accurately obtain NOX emission characteristics in an ultra-supercritical CFB boiler under construction, model research and experimental verification of NOX emission prediction were carried out in this paper. The results indicate that three models could all predict NOX emission in the CFB boiler, and the deviation among the predicted values calculated by these models can be controlled within 15%. When an ultra-supercritical CFB boiler burns existing engineering coal, NOX emission would be higher than 50 mg/Nm3, which requires structural improvement and operation parameters optimization to ensure that NOX emission inside the furnace of the CFB boiler could directly reach the ultra-low emission standard.
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