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Thermodynamic and economic analyses of a hybrid waste-driven CHP-ORC plant with exhaust heat recovery

机译：废热回收混合废物驱动CHP-ORC厂的热力学和经济分析

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摘要

A smart hybrid power plant comprising a waste-fired CHP (combined heat and power) plant accompanied by a small-scale organic Rankine cycle was recently designed and analyzed thermodynamically. The objective of this hybridization is to maximize the share of electricity production of waste-CHP plants rather than a higher heat production rate in a cost-effective manner. In this work, utilization of the exergy of the hot flue gas of the waste fired CHP unit in order to increase the potential of the organic Rankine cycle for maximizing the net power output of the hybrid cycle is proposed and techno-economically analyzed. In addition, the effect of using alternative environmentally-friendly organic working fluids on the performance of the system was investigated. The results of the study show that by the flue gas potential utilization of the same CHP unit, the size of the organic Rankine cycle may increase significantly, leading to a larger power output of the plant. As such, the net exergy and energy efficiency values of the combined plant in various operational conditions are improved compared to its primary configuration by, respectively, about 10% and 20%, when both of the main CHP cycle and the organic Rankine cycle are working at nominal load. In addition, this exergy utilization is beneficial economically as well, decreasing the payback period of the parallelization project by about 10% (from 7.4 years to 6.7 years). The alternative organic working fluid does not make a significant change in the technical and economic performance indices of the system.
机译：最近设计并分析了伴随着小型有机朗肯循环的废物烧制的CHP（组合热和动力）植物的智能混合动力厂。这种杂交的目的是以经济效益的方式最大限度地提高废物CHP工厂的电力生产的份额而不是更高的热量生产率。在这项工作中，利用废物燃烧CHP单元的热烟气的漏气的水平，以增加有机朗肯循环的电位，以便最大化混合循环的净功率输出，并经济学分析。此外，研究了使用替代环保有机工作流体对系统性能的影响。研究结果表明，通过烟气潜在利用相同的CHP单元，有机朗肯循环的尺寸可能会显着增加，导致植物的更大功率输出。因此，当主要CHP循环和有机朗肯循环都在工作时，各种操作条件下，各种操作条件下的组合植物的净驱逐和能量效率值得到改善，分别为约10％和20％。在名义上。此外，这种漏洞利用也是有益的经济上，将平行化项目的投资回收期降低约10％（从7.4岁到6岁）。替代有机工作流体不会在系统的技术和经济性能指标进行重大变化。

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