太阳能与燃气-蒸汽联合循环互补性能分析

Complementarity analysis of solar energy and gas turbine combined cycle

在世界能源储量短缺的背景下,如何提高现有能源可利用率已成为研究热点。太阳能作为一种清洁能源,为发展燃气-蒸汽联合循环(GTCC)系统提供了新的研究方向。将太阳能与燃气发电装置耦合在顶循环(布雷顿循环)的发电系统实现了新能源与传统燃机的多能互补综合利用。结合热力学第一定律理,搭建了整体热力学模型,利用Ebsilon模拟软件对太阳能互补联合循环(ISCC)系统和传统GTCC系统的运行性能参数进行了对比分析,并研究了不同法向直接辐照度(DNI)和大气环境温度对ISCC系统变工况下运行特性及整体节能的影响。研究表明,当天然气输入量为10kg/s时,GTCC系统循环热效率为39.8%,ISCC系统循环热效率为44.1%;在控制系统总输出电功率不变的条件下,ISCC系统能比GTCC系统节省2.638kg/s的天然气输入量。太阳能与传统GTCC的有机耦合使系统循环热效率和综合输出电功率大幅提高,并在经济性方面显现出较大优势。

In the fight against global energy shortage,how to improve the availability of existing energy has become a research hotspot.As a kind of clean energy,solar energy provides a new developing direction for the gas turbine combined cycle(GTCC)system.The power generation system in which solar energy and gas turbines are integrated in the top cycle(Brayton cycle)can realize multi-energy comprehensive utilization.The thermodynamic models for an ISCC system and a GTCC system are established in line with the first law of thermodynamics.Then,the performance parameters of these two systems are comparatively analyzed by Ebsilon simulation software,and the operating characteristics and energy-saving performance of the ISCC system under different direct normal radiation(DNI)and ambient temperature are studied.The research results show the circulating thermal efficiencies of the GTCC system and ISCC system are 39.8%and 44.1%respectively with a 10 kg/s gas inflow rate.On the premise that ISCC system′s electric output remains unchanged,the ISCC system can saved 2.638 kg/s natural gas compared with the GTCC system.The coupling of solar energy and traditional GTCC can improve the thermal efficiency,electric output and economy of the whole system.