Experimental investigation of pollutants emission characteristics from circulating fluidized bed boilers

In order to provide basic data for further emission reduction and technical supervision,different pollutants emissions are actually measured according the test codes under the condition of 100% BMCR load of two circulating fluidized bed boilers recorded as U1 and U2 with evaporation capacities of 240 t/h and 450 t/h respectively.The pollutants emission characteristics,coordinated removal efficiencies and environmental benefit were obtained from monitoring results that provided the basic data support for the enterprise sewage declaration,technical supervision and further emission reduction.The measurement results show that circulating fluidized bed boilers have the characteristics of high efficiency and clean performance,because common pollutants and others are effectively reduced through the pollution control equipment and coordinated control system.The average concentrations of dust,SO_2,NO_x,Hg,NH_3 and SO_3 are 13.1,16.0,71.4,5.6 ×10(-3),1.7,1.6 mg/m~3 of U1 boiler,and 4.8,10.4,95.7,69.4,4.9×10(-3),0.4,0.6 mg/m~3 of U2 boiler,respectively.The emission of SO_2 are 0.085 8 and 0.040 1 g/k Wh; while the emission of NO_x are 0.370 1 and 0.354 4 g/k Wh respectively.Consequently,only dust and NOx is needed be further removal to meet the ultra-low pollutants emission.