SDJF-A1脱硫脱硝CO助燃剂在催化裂化装置的应用

APPLICATION OF SDJF-A1 DESULFURIZATION AND DENITRATION CO COMBUSTION SUPPORTING AGENT IN CATALYTIC CRACKING UNIT

针对催化裂化装置烟气脱硝SCR单元脱硝催化剂因超期服役存在的催化剂老化及失效、喷氨量大、余热锅炉出口结盐严重等问题,以及脱硫塔腐蚀和烟气洗涤脱硫后携带盐分致烟气固体颗粒物超标的问题,选用脱硫脱硝CO助燃剂--SDJF-A1剂进行工业试用,工业应用结果表明:该装置再生系统加注SDJF-A1剂占系统藏量(质量分数)的5%后,在停用原CO助燃剂(Pt型)和SCR单元停止注氨条件下,再生烟气中的NO_(x)含量均值由586 mg/m^(3)降至l20 mg/m^(3),SO_(x)含量均值由420 mg/m^(3)降至60 mg/m^(3),液碱用量(质量分数)降低81.8%以上,同时再生器稀密相温差小于13℃,满足工艺操作和国家烟气排放标准要求。

For overage service catalyst used in catalytic cracking device of the flue gas denitration SCR unit,problems existing in the SCR unit were described,such as aging and failure of the catalyst,large amount of ammonia injection,serious salt deposition at the outlet of waste heat boiler,as well as corrosion of the desulfurization tower,solid particles in flue gas exceeding the standard caused by salt carried after the flue gas washing and desulfurization,and SDJF-A1 desulfurization and denitration CO combustion supporting agent was selected for industrial trial.Under the condition of no using the original CO combustion supporting agent(Pt type)and no ammonia injection in SCR,the industrial application results showed that after SDJF-A1 agent was injected into the unit regeneration system with 5%consumption of the system storage,the average value of NO_(x)in regeneration flue gas was reduced from 586 mg/m^(3)to 120 mg/m^(3),and the average value of SO_(x)was reduced from 420 mg/m^(3)to 60 mg/m^(3),the amount of liquid alkali was reduced by more than 81.8%(mass fraction),and the temperature difference between dilute and dense phases of the regenerator was less than 13℃,the requirements of process operation and national flue gas emission standards were met.