Title : A systematic evaluation of dual-stage treatment for the flare gas using hysy software
Abstract:
This research evaluates the efficacy of two-stage flare gas treatment systems by employing amine, CO2 supercritical, and hybrid techniques using Aspen HYSYS software. We aim to identify the optimal approach for maximizing total flare gas abatement and minimizing environmental impact. This research explores novel configurations tailored to address the differential solubility of specific flare gas components in CO2 supercritical and amine phases, promoting sustainable and efficient treatment. A comprehensive simulation and evaluation were conducted using Aspen HYSYS V12.1. The flare gas underwent initial compression before entering a two-stage absorber. In the first configuration, both stages utilized amine absorption, while the second configuration involved two stages of CO2 Supercritical absorption. The third configuration featured a single stage of CO2 Supercritical absorption followed by an amine absorber. Before absorption, the CO2 Supercritical underwent compression and cooling. This systematic approach facilitates a detailed comparison of the performance of dual-stage (Amine, CO2 Supercritical) and Hybrid approaches in flare gas treatment. The research provides valuable insights into the effectiveness of various flare gas treatment configurations. Remarkably, the two-stage CO2 supercritical method failed to eradicate H2S, exposing a crucial shortcoming totally. In this case, CO2 supercritical recovered 96.27% of the hexane with high selectivity. This highlights the possibility of customized gas treatment solutions using CO2 supercritical to capture particular hydrocarbons precisely. However, the amine configuration using two steps yielded a higher recovery rate for methane, 99%, compared to the hybrid configuration (97%). These findings reestablish the fact that the one CO2 supercritical, one amine configuration is the most favorable one. Not only does it solve the problem of H2S elimination, but it also presents a selective approach for the recovery of hexane by CO2 supercritical stream attributed to the non-polar nature of CO2, strengthened by its straight geometry.
