2020 REFINING PROCESSES HANDBOOK PROCESS CATEGORIES COMPANY INDEX DESULFURIZATION Ammonia Claus Amine acid gas Steam Application: Sulfur recovery from sour water stripper (SWS) gas and amine acid gas. Description: In case of high ammonia (NH3 ) concentrations, especially from an SWS gas stream, NH3 must be destroyed to avoid severe operational problems in the sulfur recovery units (SRUs). To fully destroy NH3 , a "two-zone furnace" is typically used. The NH3 -bearing stream is burned with part of the amine acid gas in Zone 1 at high temperature, followed by the injection of the remaining amine acid gas into Zone 2 of the reaction furnace. A properly designed burner that has excellent mixing characteristics is used to easily reach the required high-temperature levels. By adopting the Ammonia Claus technology, the residual NH3 concentration in the thermal reactor's effluent does not adversely affect the SRU operation. SWS (NH3) off-gas Air Zone 1 NH3 burner Zone 2 Reaction furnace (two zones) To condensers/converters Waste heat boiler BFW Liquid sulfur Operating conditions: Up to a ratio of NH3 /hydrogen sulfide (H2S) < 0.3 in the overall feedstock. Yields: Up to 95% sulfur recovery as a standard Claus with two converters. Advantages: Disposal of NH3 , making use of a Claus unit Installations: More than 60 Ammonia Claus plants have been built worldwide, with an NH3 concentration in the feed stream ranging from 0.5%-30%. Investment: As per standard Claus Licensor: Siirtec Nigi S.p.A. Utilities: Power and water as standard Claus Website: www.siirtecnigi.com/design-sulphur-recovery-removal Development/Delivery: Same as standard Claus Contact: marketing@siirtecnigi.com Copyright © 2020 Gulf Energy Information. All rights reserved.http://www.hydrocarbonprocessing.com/ http://www.siirtecnigi.com/design-sulphur-recovery-removal