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Generating Electricity from Fluegas Produced By Boilers through a Thermodynamic ORC (Organic Rankine Cycle) Driven by R245fa

Omid Rowshanaie, Saari Bin Mustapha and Hooman Rowshanaie

In recent years, an increase in fossil fuel prices and imposing strict laws and regulations by environmental organizations have resulted in an increasing interest on the parts of researchers in oil industry to implement various projects to eliminate pollutants emitted by fluegas in order to achieved the desired standards. Today, different processes including heaters, furnaces, and boilers are used by different industries resulting in the production of a large volume of fluegas. The energy and heat wasted by these gases can be recovered even in low temperatures in order to be used in various processes such as preheating refinery fluid flows or generating electricity. ORC (Organic Rankine Cycle) is a thermodynamic cycles used for generating electricity in the majority of plants and also in this article; furthermore, its function is similar to Karno cycle. In ORC thermodynamic cycle, superhot vapor of fluegas is first produced by a boiler and then it is sent to an evaporator then sent to a turbo-expander to produce electricity. Finally, the remaining vapor is condensed by an air cooler and it is sent back to the ORC thermodynamic cycle. ORC thermodynamic cycles are usually based on vapor working fluid fluids such as NOVEC7000, R123, R134a, and R245fa (1,1,1,3,3-pentafluoropropane), (employed in the present article) as the working fluid of ORC thermodynamic cycle.