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
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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.
Claims20
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;
- 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.
An apparatus for controlling feed rates in a facility comprising:
- a first hydrogen sulfide analyzer for determining the concentration of hydrogen sulfide in a first line in upstream fluid communication with a thermal oxidizer;
- an ammonia analyzer for determining the concentration of ammonia in a second line in upstream fluid communication with an ammonia scrubber;
- a logic controller in signal communication with said first hydrogen sulfide analyzer and said ammonia analyzer;
- a first control valve in signal communication with said logic controller for controlling the flow rate in the first line to the thermal oxidizer.
A process for controlling feed rates in a facility comprising:
- determining the molar flow rate of sulfur oxide or ammonia in an overhead stream exiting an ammonia scrubber;
- adjusting the flow rate of hydrogen sulfide in a sour gaseous stream and/or a solvent gaseous stream to a thermal oxidizer and/or adjusting the flow rate of ammonia to said ammonia scrubber in response to the determination of the concentration of hydrogen sulfide or ammonia exiting an ammonia scrubber.
Dependencies are inferred from the claim text.