Fluor Technologies Corporation

Fluor Corporation

Thomas King Chow

Vincent Wai Wong

John Gebur

Theresa Flood

John Mak

Curt Graham

Satish Reddy

Richard B Nielsen

Elmo Nasato

Uday Navin Parekh

Ryan Chow

Oliver Morgan

A system for reducing SOemissions comprises a hydrogenation reactor, a tail gas cooler, a contact condenser, a hydrolysis reactor, and an absorber. The hydrogenation reactor is configured to receive a Claus tail gas and convert at least a portion of SOin the Claus tail gas to HS to produce a hydrogenated Claus tail gas stream. The hydrolysis reactor is configured to convert at least a portion of COS to HS. The absorber comprises an amine-based solvent and is configured to absorb at least a portion of the HS and recycle the HS to the Claus plant.

Systems and methods for improved sulfur recovery from claus process tail gas

Advanced oxygen enrichment technologies for Claus plants are presented that provide an oxygen rich gas stream to the Claus burner of the thermal stage and one or more oxygen rich bypass gas streams to at least one of the catalytic stages to so increase the capacity of the plant while reducing the amount of recycle gases needed for flame temperature moderation.

Configurations and methods for advanced oxygen enrichment for sulfur recovery

Sulfur oxides are removed from an oxygen-containing acid gas in configurations and methods in which oxygen is catalytically removed using hydrogen sulfide, and in which the sulfur oxides react with the hydrogen sulfide to form elemental sulfur. A first portion of the remaining sulfurous compounds is reduced to form the hydrogen sulfide for oxygen removal, while a second portion of the sulfurous compounds is further converted to elemental sulfur using a Claus reaction or catalytic direct reduction reaction.

Configurations and methods for effluent gas treatment

Sulfur emissions from liquid sulfur are reduced, or even entirely avoided by degassing the liquid sulfur at pressure in an out-of-pit vessel and by sweeping the rundown pit (or vessel) with a sweep gas that is non-poisonous for a hydrogenation catalyst. Acid gases from degassing are fed at pressure to the Claus unit, while sweep gases are fed to the tail gas treatment unit to substantially recycle the acid gases to extinction. In preferred plants and methods, motive fluids and booster eductors or compressors are not needed, and incineration of the acid gases can be avoided.

Configurations and methods of treatment of sulfur-containing vent gases

Methods and configurations are drawn to a plant in which an effluent gas () comprising oxygen and sulfur dioxide is catalytically reacted with hydrogen sulfiden () and hydrogen and/or carbon monoxide () to form a treated gas that is substantially oxygen free and in which sulfur dioxide is converted to hydrogen sulfide. In most preferred aspects, the hydrogen sulfide is provided to the process via a recycle loop (B).

A Claus plant with multiple parallel thermal stages that provide a combined effluent to downstream catalytic stages includes a controller that allows independent and individual control for each of the thermal stages as a function of measured chemical composition of the thermal stage effluents and catalytic stage effluent.

Air demand feedback control systems and methods for sulfur recovery units

Sulfur oxides are removed from an oxygen-containing acid gas in configurations and methods in which oxygen is removed from the acid gas using reducing gases at relatively high temperature. The so treated acid gas is then fed to a direct reduction reactor in which the sulfur species are converted to elemental sulfur. Contemplated configurations are particularly effective and economically attractive as they are generally not limited by reaction equilibrium as present in a Claus reaction and do not require solvent and solvent-associated equipment.

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Carbonyl sulfide (COS) from a COS-containing stream () is convened in a Claus plant () to elemental sulfur () by oxidation of a first portion of the COS-containing stream to SOand by hydrolysis of a second portion of the COS-containing stream to HS. In preferred aspects of the inventive subject matter, hydrolysis and/or oxidation of the COS is performed in the reactor furnace (), while hydrolysis of the COS is performed in the reactor furnace (), a hydrolysis reactor, and/or a catalytic converter ().

COS-Claus configurations and methods

Hydrogen sulfide is selectively enriched from an acid gas () that comprises relatively large quantities of carbon dioxide using a configuration in which a portion of an isolated hydrogen sulfide stream is introduced into an absorber () operating as a carbon dioxide rejecter. The resulting concentrated hydrogen sulfide enriched solvent () is then further used (directly or indirectly) to absorb hydrogen sulfide from an acid feed gas.

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Irvine, CA, United States of America

Thomas King Chow