Modeling sulfur-Nitrogen chemistry indside a claus reaction furnace

This paper describes a CFD analysis of a Sulfur Recovery Unit (SRU) considering transient turbulent reacting flow inside the SRU. Often, the SRU feedstock includes hydrocarbons together with nitrogen and sulfur species, which react with oxygen in the air to form various emissions including SO2, NH3 and NO2. This work used an LES based CFD code (C3d) to analyze the SRU performance for various feed conditions. This work includes detailed chemical reactions with transient fluid mixing to provide time-accurate results. The complex SRU reaction chemistry described by Ibrahim, et.al. 2020 [1] was simplified based on previous work by Sebbar et.al. (2018) [2] and Andoglu, et.al. (2019) [3] to integrate detailed kinetics with transient fluid flow. Since the SRU feedstock involves hydrocarbons reacting with air, a previously validated C3d combustion model accurately describes the hydrocarbon-oxygen chemistry.