Water wall boiler for air and oxygen fired Claus sulfur recovery units
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United States of America Patent
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Jun 27, 2006
Grant Date -
Dec 30, 2004
app pub date -
Jun 15, 2004
filing date -
Jun 25, 2003
priority date (Note) -
Expired
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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.
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