HIGH PRESSURE-LOW PRESSURE STEAM SYSTEM FOR EXTENDED CLAUS SULFUR RECOVERY PLANT

摘要

In a Claus process sulfur recovery plant of thetype having at least three reactors operated alternatelyunder high temperature Claus conditions and under cold bedadsorption conditions, an emissions-affecting pressuresurge in a low pressure steam delivery system due to ahigh pressure to low pressure transition in a switchedsulfur condenser is avoided by providing a dedicated lowpressure condenser in the process gas stream at times whenswitching a condenser from a high pressure to a lowpressure system would otherwise cause the emissions-affectingpressure surge to occur. Recoveries are maintained athigh levels and operating difficulties with a prior artplant are avoided.