The word flare is used to describe an unprotected (open) flame that burns excess gases. This phenomenon usually happens in oil facilities such as upstream oil facilities, refineries and petrochemical industries, as well as in chemical units in order to maintain the safety of the employees and equipment on site. In the past one hundred years, the increase in the use of fossil fuels in various industries, including refineries, petrochemicals, industrial complexes, etc., to achieve higher production, has caused an increase in various pollutants in the world. And environmental concerns have imposed various economic costs and health costs on mankind. One of the most important sources of environmental pollution is industrial flare gases. According to world statistics, Iran is known as the third country that burns these gases. Reducing the emission of these gases is one of the major goals of the international community. In this research, using the output data from flare gas of a sample refinery and using HSC Chemistry software, pollution, losses and also the amount of energy wastage have been calculated, and these figures show the necessity of providing a suitable method to recover this energy. The investigation of this case shows that one of the appropriate solutions is to use flare gas as a gas fuel source.