Discussion On Stable Operation Of Acetylene Hydrogenation Reactor In Ethylene Plant

Acetylene hydrogenation reactor is the core unit of ethylene plant,which is related to product quality and stable operation of the plant.In the process of pre depropanization and hydrogenation,there are many factors affecting the catalyst activity.The 460000 T / a ethylene plant of Lanzhou Petrochemical Co.,Ltd.experienced three temperature jumps during the operation period from 2016 to 2019,which caused serious deterioration of catalyst performance and brought great difficulties and challenges to the long-term stable operation of the unit.Based on the analysis of the causes and the operation of the reactor 301 D in the 460000 T / a ethylene plant of Lanzhou Petrochemical Co.,Ltd.,it was found that the influence of space velocity,CO concentration,alkyne content,bed deacetylene distribution,C4 component content and catalyst poison on the stable operation of the hydrogenation reactor was found.After optimizing the operation of cracking furnace,controlling the cracking depth to make CO concentration and alkynes in the appropriate range,optimizing the operation of high pressure depropanizer to reduce the content of C4 component,reasonably distributing the amount of acetylene in each bed,changing the loading mode of catalyst and reducing the poison of catalyst,the results show that the acetylene removal rate of each bed of acetylene hydrogenation reactor meets the process requirements,the temperature rise of each bed is stable,and the inlet temperature is controlled within a reasonable range.Finally,the reactor runs stably for 11 months,which effectively improves the economic benefits of ethylene plant.Based on the above analysis and research,the optimal operation of acetylene hydrogenation reactor was concluded.