Experimental Study of the Flue Gas Desulfurization Project of a Reflux Circulating Fluidized Bed

At Yinchuan Thermal Power Plant an experimental investigation was conducted on boiler No.5 (150 t/h) involving the flue gas desulfurization plant for a reflux type circulating fluidized bed (CFB) with a semi-dry method of CFB desulfurization technique being employed. The designed flue gas quantity being treated on the desulfurization plant is 160,000 m3/h. Inside the desulfurizer and at its top employed is a special reflux construction design. With the realization of internal circulation of materials inside the desulfurizer the concentration at the inlet of dust removal device has been reduced. Through industrial tests studied was the impact of calcium/sulfur ratio and water spray rate on the efficiency of the system desulfurization. Test results indicate with the calcium/sulfur ratio being 1.3, temperature and concentration inside the desulfurizer respectively at 70 oC and 800 g/m3 the system desulfurization efficiency can reach 90%, dust emission concentration is 80 mg/m3 and the desulfurization system resistance less than 1.5 kPa.