Mitchell Moloney - ExxonMobil Petroleum & Chemical B.V.B.A
This presentation will discuss techniques used to allow the recycled use of water recovered in the Delayed Coker Blowdown System. As part of the coke bed cooling process, water is vaporized and superheated. This high-temperature steam passes through or around a contactor vessel, is condensed by fin fan coolers, separated from light gas and oil in a 3-phase separator vessel. The water contains a variable level of dissolved hydrogen sulfide (H2S) and ammonia (NH3) gas, which can cause odor issues, requiring that the water be sent to the refinery sour water stripper tower. Discussed are methods (flash and chemical) that can be employed to allow the water to be recycled to the Delayed Coker cutting water/ quench water tank(s).