生物基脱硝技术在催化裂化装置应用总结

Summary of application of bio-based denitration technology in FCC unit

介绍了非氨生物基无触媒宽温脱硝技术在某企业2.8 Mt/a催化裂化装置余热锅炉烟气脱硝中的应用情况。分别选取装置在2022年和2023年同时期且参数接近的工况,考察了生物基脱硝剂的脱硝效果。结果表明:加剂前后,催化裂化装置外排烟气中NO_(x)的质量浓度由150 mg/m^(3)降至56 mg/m^(3),满足当地烟气NO_(x)环保排放要求;非氨基脱硝助剂喷淋在余热锅炉炉膛中,未影响到炉膛温度(温度保持在790℃左右);余热锅炉烟气压力降和出口温度无明显变化;非氨基脱硝助剂在余热锅炉炉膛中与烟气中NO_(x)充分反应,外排废水COD(化学需氧量)为8~25 mg/L、氨氮(NH_(3)-N)的质量浓度为0.2~0.7 mg/L,达到厂控环保指标要求。生物基脱硝技术在催化裂化装置余热锅炉烟气脱硝中的应用效果较好,实现了企业外排烟气脱硝安全环保以及装置平稳长周期生产。

The application of non ammonia bio-based catalyst free wide temperature denitrification technology in the flue gas denitrification of waste heat boiler in a 2.8 MM TPY catalytic cracking unit(FCC unit)in a certain enterprise is introduced.Under operating conditions with similar parameters for the same period in 2022 and 2023,the denitrification effect of bio-based denitration additive is investigated.The results show that before and after adding the catalyst,the mass concentration of NO_(x)in the flue gas discharged from the FCC unit decreased from 150 mg/m^(3)to 56 mg/m^(3),meeting the requirements of local environmental emission indicators;the additive sprayed in the furnace of the waste heat boiler does not affect the furnace temperature(maintained at around 790℃);there is no significant change in the flue gas pressure drop and outlet temperature of the waste heat boiler;the additive fully reacts with NO_(x)in the flue gas in the furnace of the waste heat boiler.The COD of the discharged wastewater is 8-25 mg/L,and the mass concentration of NH_(3)-N is 0.2-0.7 mg/L,meeting the environmental protection indicators of factory control.The application effect of bio-based denitrification technology in the flue gas denitrification of waste heat boilers in FCC units is good,which can achieve the safety and environmental protection of the enterprise’s external flue gas denitrification,as well as the stable and long-term production of the unit.