Abstract:

Taking a 600MW coalfired unit limestonegypsum wet flue gas desulfurization (WFGD) system as an example, the polycyclic aromatic hydrocarbons (PAHs) carried within flue gas and flue gas particulate at inlets and outlets were tested and compared. The alteration of PAHs concentration at inlets and outlets of WFGD system are analyzed. The test results show that PAHs concentration carried within flue gas is 1126.7ng/m3 and more than 66.8% of it is distributed in flue gas particulate. The removal rate of WFGD system to PAHs is 60% and the removal rate to tetracyclic hydrocarbon and PAHs with five or more membered rings are 68.5% and 59.2% respectively, which is much higher than the removal rate to PAHs with 2 or 3 membered rings.

Key words:

coalfired power plant, wet flue gas desulfurization, polycyclic aromatic hydrocarbons, removal rate, particulate