关键词: 催化裂化装置, 非氨生物基还原脱硝, SCR脱硝, 不完全再生, NO_x浓度, SO₃浓度, COD, NH₃-N

Abstract: In the actual production of the FCC unit, the selective catalytic reduction(SCR) denitration has the problems of high operating costs, pressure drop in the bed, serious blue tailing caused by SO2 oxidation, and how to choose the subsequent denitration technology routes. Therefore, industrial trial of non-ammonia bio-based denitrification technology is carried out and technical analysis is conducted. The application results show that when the non-ammonia bio-based denitrification technology is used for CO boiler of the incomplete regeneration FCC unit, under the condition that the spray coverage area only accounts for 30%～40% of the total flue gas flow area, the NOx mass concentration in flue gas can be reduced from 130.6 mg/m3 to 44.8 mg/m3, and the denitration rate is 65.8%, which meets the requirements of the flue gas NOx environmental protection emission index, while avoiding the oxidation of SO2 in the flue gas to generate SO3, and reducing the generation of blue tailing, and having no adverse effects on the COD, NH3-N and other indicators of discharged saline waste water, as well as the smooth operation of CO boiler. For new installations, non-ammonia bio-based denitrification technology can replace SCR technology, reducing equipment investment and operating costs.

Key words: FCC unit, non-ammonia bio-based denitrification, SCR, incomplete regeneration, NO_x concentration, SO₂ concentration, COD, NH₃-N