COMBUSTIBLES MEASUREMENT IN SULFUR RECOVERY UNIT ACID GAS WITH A COMBINED NDUV/NDIR ANALYZER

摘要

The paper describes the development of a gas analyzer that uses both ultraviolet and infraredrnspectroscopy for the measurement of hydrogen sulfide (H_2S) and Total HydrocarbonrnCombustibles (THC) in the acid gas feed to the reaction furnace of a Claus Sulfur Recovery Unitrn(SRU). The analyzer combines a Non-Dispersive Ultraviolet (NDUV) optical bench with a Non-rnDispersive Infrared (NDIR) sensor for the simultaneous measurement of H_2S and Hydrocarbonsrn(HC_s) from a single sample point. This measurement requires a very fast response time forrneffective feed-forward control. A total hydrocarbon measurement is done rather than attemptingrnspeciation of the hydrocarbon mixture. The prototype analyzer will be field tested in severalrndifferent SRU acid gas streams.