Back to results
US 12,485,384 B2Granted
Process for controlling hydrogen sulfide and ammonia flow rates
AssigneeUop LLC
InventorsCameron Kardel, Donald Eizenga, James W. Harris, Jan De Ren, Zudtky Wisecarver, Alexander Green, William J. Whyman, Ian Clarke
Life of this patent
Estimating the term…
Abstract
A control process and apparatus provide feed forward control of stoichiometric proportions of hydrogen sulfide and ammonia to a thermal oxidizer and an ammonia scrubber, respectively. To account for unmeasured or uncalculated sulfur feed to the thermal oxidizer, a feed back measurement of sulfur dioxide and ammonia concentration is used to correct the flow rate of hydrogen sulfide to the thermal oxidizer and/or ammonia to the ammonia scrubber.
Claims9
A process for controlling feed rates in a facility comprising:
- determining the molar flow rate of hydrogen sulfide charged to a thermal oxidizer;
- determining the molar flow rate of ammonia charged to an ammonia scrubber;
- determining a concentration of sulfur oxide or ammonia in a stream exiting the ammonia scrubber and adjusting the flow rate of hydrogen sulfide in a sour gaseous stream and/or a solvent gaseous stream to the thermal oxidizer in response to the determination of the concentration of sulfur oxide in a flue gas stream;
- increasing the flow rate of the sour gaseous stream before increasing the flow rate of the solvent gaseous stream in response to the determination of the concentration of sulfur oxide in the flue gas stream;
- and
- controlling the flow rate of hydrogen sulfide to the thermal oxidizer and the flow rate of ammonia to the ammonia scrubber to provide stoichiometric molar proportions for a chemical reaction between ammonia and sulfur dioxide.
3 more elements
Dependencies are inferred from the claim text.