Abstract. Exhaust gas treatment device of coa弟路l fired boiler has been u微黃pgraded with ultra clean disch光慢arge treatment technology, and the new cy弟熱clone gas cap washing device is appli個道ed in the second half of the desulfurzing tower systm. This new wate區藍r scrubbing tray system is com金短posed with water spray老了s, ceramic packing, cyclone gas cap and個如 independent water tank, which is的海 proven by field tests, 司少has exceling effect o綠多n exhaust gas treatment, and can decrease下玩 concentration of aerosol in ex購線haust gas to below 5mg/Nm³ which is lower than the state discharge standa匠間rd.