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Thermodynamic analysis of organic Rankine cycle used for flue gases from biogas combustion

机译：用于沼气燃烧烟气的有机朗肯循环的热力学分析

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摘要

This study elaborates an investigation on organic Rankine cycle (ORC) for integration with a sewage plant for generation of power and district heating purposes. Flue gases from combustion of biogas is considered as heat source. Initially, design constraints of the cycle i.e. pump exit temperature, source exit temperature, cooling fluid exit temperature, and flue gases exit temperature are applied to check the ORC applicability. Furthermore, fifteen sets of working conditions with combinations of evaporation pressure, source temperature, and pinch point condition are passed through a step by step energetic and exergetic analysis. Seven best set of working conditions are shortlisted to examine the thermal efficiency of the cycle for combined heat and power (CHP) generation. In addition, the research also highlights the importance of biogas technology with respect to environment. The results show that the maximum work output of 156.4 kW is produced at source temperature of 345 degrees C, evaporation pressure of 36 bar, and pinch point of 5 degrees C at evaporator and 10 degrees C at condenser. This research demonstrates that biogas-fired ORC systems depicts an efficient solution for domestic scale power generation applications in rural areas.
机译：这项研究详细研究了有机朗肯循环（ORC），用于与污水处理厂集成以发电和供热。来自沼气燃烧的烟气被认为是热源。最初，应用循环的设计约束条件，即泵出口温度，源出口温度，冷却液出口温度和烟道气出口温度，以检查ORC的适用性。此外，结合蒸发压力，源温度和夹点条件的15套工作条件逐步进行了能量和能量分析。列出了七个最佳工作条件组，以检查热电联产（CHP）循环的热效率。此外，研究还强调了沼气技术对环境的重要性。结果表明，在源温度345摄氏度，蒸发压力36巴，收缩点在蒸发器处为5摄氏度，在冷凝器处为10摄氏度时，产生的最大功输出为156.4 kW。这项研究表明，以沼气为燃料的ORC系统为农村地区的家庭规模发电应用提供了一种有效的解决方案。

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