مقایسه فنی و اقتصادی روش‌های خنک‌سازی گاز داغ خروجی از راکتور واحد پاک‌سازی گاز پسماند

In order to prevent environmental pollution and production of elemental sulfur, the acid gases out coming from the oil and gas refineries is converted to elemental sulfur in Sulfur Recovery Units (SRUs). Tail Gas Treatment Units (TGT) are applied at the end of SRU for more processing of tail gas and enhance low recovery of sulfur from 96% to over 99%, and therefore, respect to environmental regulations in term of fatal SO2 emission. The temperature of outlet gas from TGT reactor should be decreased to a proper value. For this purpose, a circulation water together with a cooling column system or a air cooler can be considered. In this paper, a typical industrial unit of sulfur recovery equipped with tail gas treatment was considered and for these two cases, the required equipment were designed and the construction and operational costs were compared. The results show that using cooling column has lower construction cost than using air cooler system, but the operating cost is more than operating cost of air cooler.