The current selective catalytic reduction (SCR) denitrification technology has problems such as NH₃ escape and NH₄HSO₄ scaling. Low-temperature ozone oxidation (Lotox) denitrification technology can convert NOx in flue gas and bring it into the discharged saline wastewater of the washing tower to generate nitrite and nitrate, which can easily lead to excessive total nitrogen and chemical oxygen demand (COD). The conversion law of nitrogen compounds in catalytic cracking flue gas was analyzed. A catalytic cracking unit applied non-amino selective non-catalytic reduction (SNCR) denitrification technology under different operating conditions. The results show that the use of non-amino SNCR denitrification technology can reduce the mass concentration of NOx in catalytic cracking flue gas from around 180 mg/m³ to 45.5 mg/m³, and the emission reduction rate of total nitrogen and other pollutants in the discharged saline wastewater of the washing tower exceeds 90%, with COD reduced by more than 90%.

border:0px, font-size:14px, font-family:-apple-system, BlinkMacSystemFont, ", vertical-align:baseline, margin:0.859em 0px, color:#060607, background-color:#FFFFFF, "> two-stage regeneration, catalytic cracking unit, non-amino SNCR, NOx concentration, denitrification rate, ammonia nitrogen concentration, COD

现行选择性催化还原（SCR）脱硝技术存在NH₃逃逸和NH₄HSO₄结垢等问题；低温臭氧氧化（Lotox）脱硝技术会将烟气中的NOx转化、带入洗涤塔外排含盐污水中生成亚硝酸盐和硝酸盐；二者均易导致总氮和化学需氧量（COD）超标。对催化裂化烟气中氮化物的转化规律进行了分析。某催化裂化装置在不同工况下进行了非氨基选择性非催化还原（SNCR）脱硝技术的应用，结果表明：采用非氨基SNCR脱硝技术满负荷运行时，催化裂化烟气中NOx质量浓度由180 mg/m³左右降至45.5 mg/m³，洗涤塔外排含盐污水中总氮的减排率超过90%，COD降低90%以上。

border:0px, font-size:14px, font-family:-apple-system, BlinkMacSystemFont, ", vertical-align:baseline, margin:0.859em 0px, color:#060607, background-color:#FFFFFF, "> 两段再生, 催化裂化装置, 非氨基SNCR, NOx浓度, 脱硝率, 氨氮浓度, COD