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Techno-economic analysis of a hybrid combined cycle applied to sugarcane plants

机译：应用于甘蔗植物的杂种联合循环的技术经济分析

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Hybrid combined cycles, fueled by natural gas and biomass, have been present in several power plants. As shown by different authors, it is possible to increase the overall efficiency of these plants by means of waste heat recovery from exhaust gases of gas turbines. The main disadvantage, for some cases, is the higher natural gas consumption, making some plants economically unfeasible. The present work applies the concept of a novel hybrid combined cycle (HCC), adapted for sugarcane mills, burning sugarcane bagasse and natural gas. In order to evaluate the potential of application of this concept, a new hybrid configuration, starting from an existing plant, is proposed. A thermodynamic performance study has shown an electrical efficiency improvement (from 6.8% to 17.8%) for the same amount of bagasse originally burnt, thus allowing the plant to operate throughout the year, increasing the electricity generation (from 108.9 to 323.0GWh(e1)) as well as meeting the same steam demands for sugar and ethanol production processes. The economic evaluation, considering investments, operating expenses and plant requisites, has pointed to an internal rate of return (IRR) of 22.89%. Furthermore, this new configuration does not depend on a large natural gas consumption (gas share of 11.4%), making the plant's economic feasibility less dependent on fluctuations of natural gas prices. Finally, a sensitivity analysis of four different hybrid plants have shown the techno-economic feasibility of hybrid combined cycles applied to sugarcane mills, including during the off-season period.
机译：用天然气和生物质燃料的混合组合循环已经存在于几种发电厂中。如不同的作者所示，可以通过从燃气轮机的废气中的废热回收来提高这些植物的整体效率。在某些情况下，主要缺点是较高的天然气消耗，使一些经济上的植物不可行。目前的作品适用于新型杂化联合循环（HCC）的概念，适用于甘蔗磨机，燃烧甘蔗甘蔗和天然气。为了评估该概念的应用潜力，提出了一种从现有植物开始的新的混合配置。热力学性能研究表明，相同数量的甘蔗渣（从6.8％到17.8％的6.8％），从而允许工厂全年运营，增加发电（从108.9到323.0gwh（E1） ）以及满足糖和乙醇生产过程的相同蒸汽需求。考虑投资，营业费用和工厂所需的经济评估指出了22.89％的内部返回率（IRR）。此外，这种新配置不依赖于大型天然气消耗（煤气份额为11.4％），使工厂的经济可行性依赖于天然气价格的波动。最后，对四种不同杂种植物的敏感性分析表明，杂交组合循环的技术经济可行性应用于甘蔗厂，包括在淡季期间。

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