ฝัง
- เผยแพร่เมื่อ 24 ม.ค. 2025
- Driven by more sulfur-heavy crudes, stricter product specifications and the implementation of residue upgrade projects in existing refineries, the refinery sector is pushing its sulfur processing capacities to the limit. To deal with the increased loads, refineries are either installing new sulfur blocks or revamping existing units.
At the same time, many refineries are evolving to process ultra-low sulfur renewable feedstocks, which presents a drastic and unique challenge to the sulfur block. Since hydrotreating catalysts for renewable units require a specific sulfurous environment for proper functioning, sulfur must form an integral part of green refineries despite the low concentrations in the feedstocks. Typically, continuous dimethyl disulfide (DMDS) additions are proposed to maintain this environment. The novel design of hydrogen sulfide recovery units (HSRU) in green refineries captures, concentrates and recycles hydrogen sulfide from the amine regeneration (ARU) and sour water stripping (SWS) units back to the hydrotreating unit. This eliminates the need for continuous DMDS dosing and removes small amounts of sulfur product from the refinery.
Fluor Fellow Debopam Chaudhuri and subject matter expert Ayan Dasgupta describe this very important evolution of the sulfur block toward green refineries.
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