System for flare gas recovery using gas sweetening process
AssigneeSaudi Arabian Oil Company
InventorAhmed Khalifah Al Muhsen
Life of this patent
Estimating the term…
Abstract
The present disclosure includes systems and methods that integrate a flare gas recovery process with a gas sweetening process used in oil and gas refining. A flare gas recovery system includes a primary gas sweetening unit and a liquid-driven ejector in continuous fluid communication with the primary gas sweetening unit. The ejector includes an inlet configured to receive a motive fluid including a regenerable amine solvent in a lean state from the primary gas sweetening unit, a gas inlet configured to receive a suction fluid including a gas, and a fluid outlet configured to either directly or indirectly discharge to the primary gas sweetening unit a two-phase fluid including a mixture of the suction fluid and the amine solvent in a rich state.
Claims20
A method of supplying flare gas for a flare gas recovery system, the method comprising:
- supplying, at a first positive pressure, a flow of flare gas as a suction fluid from a flashback prevention device to an ejector of the flare gas recovery system;
- supplying, at a second positive pressure that is at least two orders of magnitude greater than the first positive pressure, a continuous flow of regenerable amine solvent in a lean state as a motive liquid to the ejector from a primary gas sweetening unit that is in fluid communication with the flare gas recovery system;
- and
- combining the flare gas and the regenerable amine solvent in the lean state together in the ejector to form a two-phase fluid that comprises a mixture of the suction fluid and the amine solvent in a rich state,
- wherein the continuous flow of the regenerable amine solvent in the lean state is configured to increase pressure of the flare gas to allow for delivery of the two-phase fluid either directly or indirectly back to the primary gas sweetening unit.
Dependencies are inferred from the claim text.