Design of Liquid Jet Ejector System for Recovery of Refinery Flaring

Moghadassi, Abdolreza; Hosseini, Seyed Amir; Bandehali, Samaneh; Nik Kholgh, Mahmoud Reza

doi:10.22050/ijogst.2026.592608.1785

Design of Liquid Jet Ejector System for Recovery of Refinery Flaring

Document Type : Research Paper

Authors

Abdolreza Moghadassi ¹

Seyed Amir Hosseini ¹

Samaneh Bandehali ²

Mahmoud Reza Nik Kholgh ¹

¹ Department of Chemical Engineering, Faculty of Engineering, Arak University, Arak 38156-8-8349, Iran

² Department of Mechanical Engineering, Ayatollah Boroujerdi University, Boroujerd 69199-69737, Iran

10.22050/ijogst.2026.592608.1785

Abstract

Flaring of refinery gases causes hydrocarbon losses and environmental impacts. This study evaluates a liquid-ejector flare-gas-recovery (FGR) system using amine as the motive fluid at Imam Khomeini (Shazand) Refinery. A pilot unit was experimentally tested at motive-fluid pressures of 20–65 barg. For a suction-gas flow of approximately 109–116 m³/h, the motive-fluid flow decreased from 33 to 17 m³/h as pressure increased from 20 to 65 barg. Pilot observations were then used to inform a process-level Aspen HYSYS simulation and an economic assessment. The proposed industrial arrangement comprises three parallel ejectors, each rated at 2000 Nm³/h (6000 Nm³/h total installed capacity), for a normal flare-gas flow of about 4000 Nm³/h. The economic analysis indicates a reported payback period of approximately two years for the base case; this estimate depends on the assumptions and cost basis described in the economic section.

Keywords

Eductor

Flare Gas Recovery

Shazand Refinery

Simulation

Subjects