Shenhua Shendong PowerGeneration Co., Ltd. in Shanxi Hexi Queer Power Plant (QueerCFB Power Plant) severely 350 MW unit circulating fluidized bed (CFB) boiler ultra-low emissions technology for high-efficiency desulfurization and nitrogen inhibition+Selective non-catalytic reduction (SNCR) denitrification technology+flue gas circulation circulating fluidized bed desulfurization process. Through on-site experiments, the effects of operating parameters such as bed temperature, operating oxygen volume, and furnace calcium-sulfur molar ratio on the emissions of NOx and SO2 at the furnace outlet, as well as the effect of adding limestone to the CFB boiler and setting a pre-electrostatic precipitator on the desulfurization and denitrification operating economy were verified. The results show that by adjusting the operating parameters during the experiment, controlling the SO2 mass concentration at the entrance of the external desulfurization tower, and comprehensively comparing the boiler thermal efficiency, the limestone consumption of the furnace spray calcium system, the urea consumption of the denitrification system, and the consumption of Ca(OH)2 from the post-furnace desulfurization system, the best operating parameters can be selected to achieve optimal combustion efficiency and furnace desulfurization and denitrification system operating economy. Pre-setting a pre-electrostatic precipitator for the external desulfurization system is even more economical. This conclusion provides a reference for the construction of new units using the flue gas circulation circulating fluidized bed desulfurization process and the implementation of ultra-low emission transformation for large CFB boilers.

350 MW;Supercritical;Circulating Fluidized Bed Boiler;Flue Gas Circulating Fluidized Bed Method;SNCR;Desulfurization;Denitrification;Ultra-low emission