COMPARION OF MERCURY EMISSIONS BETWEEN CIRCULATING FLUIDIZED BED BOILER AND PULVERIZED COAL BOILER
Mercury emissions between a circulating fluidized bed (CFB) utility boiler and two pulverized coal (PC) boilers equipped with electrostatic precipitators (ESP) were in situ measured and compared. The standard Ontario Hydro Method (OHM) was used to sample the flue gas before and after the ESP. Various mercury speciations such as Hg0, Hg2+ and HgP in flue gas and total mercury in fly ashes were analyzed. The results showed that the mercury removal rate of the CFB boiler is nearly 100％; the mercury emission in stack is only 0.028 g/h. However, the mercury removal rates of the two PC boilers are 27.56％ and 33.59％ respectively, the mercury emissions in stack are 0.80 and 51.78 g/h respectively. It concluded that components of the ESP fly ashes especially their unburnt carbons have remarkable influence on mercury capture. Pore configurations of fine fly ash particles have non-ignored impacts on mercury emissions.
circulating fluidized bed boiler pulverized coal boiler mercury emission comparison
Y.J.Wang Y.F.Duan C.S.Zhao
Thermal-energy Engineering Research Institute, Southeast University, Nanjing, 210096, China
国际会议
第20届国际流化床燃烧会议(20th International Conference on Fluidized Bed Combustion)
西安
英文
256-261
2009-05-18（万方平台首次上网日期，不代表论文的发表时间）