(473a) State of the Art Chemical Reaction Model of Hydrogen Sulfide Scavenger in Produced Gas Flow-Line Using Computational Fluid Dynamics

The presence of hydrogen sulfide (H₂S) in oil and natural gas is a common problem during the production of hydrocarbons. Due to its highly corrosive characteristics and safety hazards, it is necessary to remove high concentrations of H₂S as early as possible to reduce corrosion and protect the production asset along with the health and safety of individuals and the environment. Triazine is a widely used scavenger for this application. Accurate prediction of H₂S concentration during the scavenging process is important to highlight any risk associated with high localized H₂S quantities; however, there are many factors that affect the dynamics of H₂S scavenging in a pipeline or a flow-line. These factors include the fluid phases, fluid dynamics, injection rate, scavenger particle diameter, reaction rates, and mass transfer between the scavenger and the hydrocarbons that include H₂S.

Recently, Computational Fluid Dynamics (CFD) has been widely used by scientists and engineers as an analysis tool for complicated fluid dynamics problems. CFD codes are also used to model chemical reactions between different species. In this paper, a state of the art CFD model of H₂S scavenging process in a gas line is presented. A k-epsilon turbulent model is used together with a Lagrangian model to track the scavenger particles in the sour gas during the scavenging process. The reaction takes place in the liquid phase of the scavenger inside the injected particles. The reaction kinetics are modeled based on experimental results using reaction rates data.