【摘要】 构建了含电气体发电的ORC系统并对比于传统的汽轮机-发电机的发电方式,以发电功率和火用效率作为目标函数,基于热力学和电学理论,计算分析了亚临界状态下7种不同工质相应目标。研究表明,蒸发温度升高,系统发电功率增加。相同条件下,R134a有较大的输出电功率;热源进口温度一定,窄点温差越小,系统火用效率越大;同一窄点温差,热源进口温度不高于临界温度约2倍的窄点温差时,火用效率存在最大值;反之,火用效率则随蒸发温度单调递增。本研究将为ORC新型发电技术在工质选择和性能优化方面提供理论指导。更多还原

【Abstract】 Set up was an ORC system based on the electro-gas power generation and with the power generation power output and exergy efficiency serving as the target function,based on the thermodynamics and electricity theory,calculated and analyzed were the corresponding targets of seven working media in the subcritical state when compared with the traditional steam turbine-generator power generation mode. It has been found that with an increase in the evaporation temperature,the power generated by the system will increase. Under the same conditions,R134 a will have a relatively large output power. When the inlet temperature of the heat source is constant,the smaller the pinch point temperature difference,the higher the exergy efficiency of the system. At a same pinch point temperature difference,when the inlet temperature of the heat source is not approximately two times higher than the pinch point temperature difference,the exergy efficiency will have its maximum value. In the contrary,the exergy efficiency will monotunely increase with an increase of the evaporation temperature. The foregoing can offer theoretical guide for selection of working media and performance optimization of novel ORC power generation technologies.更多还原