Abstract This study compares the performance of a thermal power plant fired by natural gas to that fired by biodiesel blend, from exergetic and economic perspectives. A thermodynamic model has been developed to predict the performance of a running plant and was used to conduct the comparative study. Plant life of 25 years has been used to assess the viability of the gas turbine power plant by analyzing the net present cost and the break-even point for both fuels. The plant specific fuel consumption for natural gas fired and biodiesel blend fired are 0.3151 [kg/kWh] and 0.3884 [kg/kWh] respectively. The system fired by natural gas only, has a payback period of 1.9 years, internal rate of return of 52% and exhaust temperature of 915.74 [K], while that fired by the biodiesel blend has a payback period of 2.4 years, internal rate of return of 60% and exhaust temperature of 858.50 [K]. Nevertheless, biodiesel blend is preferable because it is biodegradable, produces less emissions, and as a consequence, environmentally benign. Biodiesel blend would be more suitable for firing gas turbine engines, if the combustor is redesigned to improve its efficiency. Thermo-economic analysis of gas turbine power plants is essential to improve its thermodynamic and economic performance.

中文翻译：

---

多燃料燃气轮机电厂热经济对比分析

摘要 本研究从热能和经济角度比较了以天然气为燃料的火力发电厂与由生物柴油混合物燃烧的火力发电厂的性能。已开发出一种热力学模型来预测正在运行的设备的性能，并用于进行比较研究。通过分析两种燃料的净现成本和盈亏平衡点，已使用 25 年的工厂寿命来评估燃气轮机发电厂的可行性。燃烧天然气和混合生物柴油的工厂特定燃料消耗分别为 0.3151 [kg/kWh] 和 0.3884 [kg/kWh]。仅使用天然气燃烧的系统，投资回收期为 1.9 年，内部收益率为 52%，排气温度为 915.74 [K]，而生物柴油混合物燃烧的回收期为 2.4 年，内部收益率为 60%，排气温度为 858.50 [K]。然而，生物柴油混合物是优选的，因为它是可生物降解的，产生的排放量较少，因此对环境无害。如果重新设计燃烧器以提高其效率，生物柴油混合物将更适合燃烧燃气涡轮发动机。燃气轮机发电厂的热经济分析对于提高其热力学和经济性能至关重要。