蜡油FCC装置改为完全再生工艺的技术分析

Technical analysis of revamping wax oil FCC unit into complete regeneration process

中国石油化工股份有限公司洛阳分公司Ⅰ套蜡油FCC装置设计加工能力1.4 Mt/a,采用单段常规再生技术。2009年由于进料性质变轻,出现了再生器密相温度低,稀相温度超标、再生滑阀全开、滑阀差压低、再生烧焦效果差、平衡剂碳含量居高不下等现象,给正常的生产操作带来了不便。为解决上述问题,2010年改成完全再生工艺。针对再生器后部易发生尾燃和催化剂跑损问题,采取了提高主风量、加入CO助燃剂等措施。实施后,提高了再生器烧焦效果,催化剂碳质量分数在0.05%左右,活性上升约7个单位,单耗降低,液化石油气和汽油收率增加。2011年再生器内取热系统切除,原料以加氢蜡油为主,加工能力可达到1.6 Mt/a。汽油收率达到50%左右,轻液收率约90%,优化了产品分布,证实了完全再生工艺的适用性。

The wax oil FCC unit I of SINOPEC Luoyang Company was designed with conventional singlestage regeneration process and a capacity of 1.4 million tons a year.In 2009 when the feedstocks became lighter and lighter,the regenerator dense phase temperature went down and the regenerator dilute phase temperature overran.The regeneration slide valve was fully opened,and low differential pressure alarm of slide valve was frequently tripped.The coke burning in the regenerator was poor and carbon on the equilibrium catalyst was high.All these imposed a great thread on the normal operation of the unit.In 2010,to solve these problems,the partial regeneration process was revamped into complete regeneration process to optimize the products distribution.The main air flowrate was increased and CO combustion promoter was added to solve the problems of after burning in the after section of regenerator.After implementation of these effective measures,the coke burning efficiency in the regenerator was improved,the fixed carbon on catalysts was maintained at about 0.05％,the catalyst activity was elevated by 7 units,the catalyst consumption was decreased and the yields of gasoline and LNG were increased.In 2011,the internal catalyst cooler of the regenerator was removed.The unit is mainly operated for processing wax oil and the operating capacity can reach 1.6 MM tons per year.The gasoline yield is about 50％ and the liquid yield is around 90％,which have fully achieved the objectives of products distribution optimization.Complete regeneration process has been proven applicable.