Water wall boiler for air and oxygen fired Claus sulfur recovery units
AssigneeWorleyparsons Group, Inc.
InventorMahin Rameshni
Life of this patent
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Abstract
The thermal combustion step of the modified Claus process is carried out in a water-wall boiler instead of a refractory-lined reaction furnace. The water-wall boiler replaces the conventional refractory-lined furnace and waste heat boiler when air, oxygen, or oxygen-enriched air is used as the oxidant. The acid gas combustion may be hydrogen sulfide-rich or hydrogen sulfide-lean with or without contaminants such as hydrocarbons and ammonia. Thermal combustion is performed in a single stage, without a recycle, for all levels of oxygen enrichment.
Claims20
In a process for the production of sulfur by reaction of hydrogen sulfide and sulfur dioxide where a feed of hydrogen sulfide is partially oxidized to sulfur dioxide to form reactants which yield sulfur by the catalytic Claus reaction, the improvement which comprises combustion of at least a portion of a hydrogen sulfide rich gas stream containing at least about 10% by volume hydrogen sulfide with an oxygen rich stream containing at least about 15% by volume oxygen in a water wall boiler which generates steam at a pressure of at least about 50 pounds per square inch.
In a process for the production of sulfur by reaction of hydrogen sulfide and sulfur dioxide where a feed of hydrogen sulfide rich gas streams containing hydrogen sulfide and ammonia are partially oxidized to sulfur dioxide to form reactants which yield sulfur by the catalytic Claus reaction, the improvement which comprises combustion of at least a portion of a hydrogen sulfide rich gas stream containing at least about 10% by volume hydrogen sulfide with an oxygen rich stream containing at least about 15% by volume oxygen in a water wall boiler which generates steam at a pressure of at least about 50 pounds per square inch.
Dependencies are inferred from the claim text.