Investigation of Recovery and Management Methods of Industrial Flare Gases to Return the Energy Cycle

Document Type : Review Article


1 عضو هیات علمی دانشکده شیمی، پردیس علوم، دانشگاه تهران، تهران، ایران

2 Ph.D. Student of Applied Chemistry, School of Chemistry, Alborz Campus, University of Tehran, Tehran, Iran


Due to limited resources of fossil fuels and the increasing demand of energy at global level as well as environmental pollution, optimal management of energy resources is of particular importance and plays an important role in large-scale national policy and planning. Although a significant amount of recoverable gases by the upstream oil industry, refineries, and petrochemicals are introduced into the environment via the refining process and through the flare gas emission systems. Flare gases have a very high fuel value. Meanwhile burning these gases in the flare system and their release into the environment, has environmental damages which in many cases is not compensable and leads to the imposition of high economic costs on countries. Present investigation indicated that Iran as the second largest owner of natural gas reservoir in the world produced about 9.5 trillion cubic feet of natural gas at 2017 and about 0.6 trillion cubic feet of that amount (about 6.3% of total produced natural gas) was burned in the flare systems. In this study, different methods and solutions of flare gas recovery systems are investigated in order to back into the energy cycle. In the meantime, the choice of the most appropriate technology for flare gas purification is considered as one of the most important principles of design of flare gas recovery systems. The most common methodology for utilizing flared gas in Iran is to produce liquefied petroleum gas (LPG). Also, in order to increase the exploitation of oil reservoirs, it is possible to use the gas reinjection technology. On the other hand, the use of flare gas to generate electricity at power plants, and also the use of gas to liquid conversion technology (GTL), are other suggested solutions for the management of flare gas that are still in early stages of design and implementation phase.


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