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Waste heat recovery projects using Organic Rankine Cycle technology – Examples of biogas engines and steel mills applications G. David1, F. Michel2, L. Sanchez3 1ENERTIME SAS, Paris, France 2ENERTIME SAS, Paris, France 3ENERTIME SAS, Paris, France Abstract/Resume The objectives of this paper is to present ORC technology and to show that for several waste heat recovery applications it is both technically and economically viable to decrease environmental impact from industrial and energy production by producing electricity with waste heat. A presentation of ORC technology will be carried out on such topic as : organic fluids, technical parameters, current actors and solutions, strengths and weaknesses of the technology compared to other waste heat recovery solutions. Applications in industry (recovery of thermal power available in steel mill and from a landfill gas engine exhaust) will be described - ORC technical design based on heat source characteristics, location analysis, regulatory review, safety implications and the impact on industrial process, and evaluation of investment and O&M costs – in order to evaluate the technical and economical feasibility of both applications. The study demonstrates the technical feasibility of ORC solutions and its relevance from an environmental point of view in terms of resources optimizations and reduction of greenhouse gas emissions. However, economic feasibility of projects must still be considered on a case by case basis depending on the characteristics of the heat sources (available power, temperature) but also on the resale price of electricity. Through the example of France, authors show that modules producing electricity on biogas engine exhausts already have a good pay-back time due to interesting feed-in-tariffs for electricity produced from landfill gas. On the other hand, it shows that waste heat recovery projects in industry are economically viable except where very low prices of electricity paid by industries and when lack of appropriate support measures make it non- viable. In addition to the fact that waste heat recovery is a CO2 free electricity production technology, support measures for the reduction of electricity consumption in factoriesPDF Image | Waste heat recovery projects using ORC
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