Sulfur Recovery Unit (SRU) Reaction Furnace
The reaction furnace is the heart of the Sulfur Recovery Unit (SRU), initiating the conversion of H2S and other sulfur-bearing compounds to elemental sulfur. The feed stream to the reaction furnace is an acid gas containing large quantities of hydrogen sulfide (H2S) that is typically burned with enough air to oxidize one-third (1/3) of the H2S to sulfur dioxide (SO2). The reaction is highly exothermic and is typically controlled to a temperature between 2200-2700°F (1200-1500°C). Downstream of the combustion zone, the unburned, remaining two-thirds (2/3) portion of H2S reacts endothermically with SO2 formed in the combustion zone to produce elemental sulfur vapor. The sulfur vapor is condensed to molten sulfur product downstream of the reaction furnace.