硫磺回收装置停工过程的安全问题探讨

硫磺回收装置长期在高温高硫环境下运行 ,容易腐蚀生成硫化亚铁 (FeS)并在管线、设备死角和反应器内积聚。停工过程容易过氧导致FeS自燃 ,造成设备和催化剂的损坏。在硫磺装置上广泛应用各种负载金属催化剂 ,这些催化剂在停工过程中需要进行还原、热浸泡、烧碳再生、惰性气体吹扫、钝化处理 ,这些处理过程都面临过氧导致催化剂床层飞温危险。针对这些影响硫磺装置安全停工的因素进行分析 ,并提出防范措施

A discussion on safety problem of sulfur recovery unit during shutdown process

Ferrous sulfide(FeS) is formed as corrosion results in sulfur recovery units operated under the conditions of a long period of high temperature and high sulfur which deposit on pipelines,equipment and reactors.During shutdown process,super-oxygen causes FeS spontaneous combustion,doing harm to the equipment and catalyst.Catalysts with metal compound promotors are widely used in sulfur recovery units.These catalysts need to be disposed in such processes as stripping of sulfur,purging with inert gas,regeneration and passivation during shutdown process.The existence of any free oxygen can result in temperature runaways,and tends to destroy the catalyst and can cause other problems with equipment and controls.Factors which affect shutdown safety for sulfur recovery unit are discussed,and precautionary suggestions against accident are also given.