Complementarity analysis of solar energy and gas turbine combined cycle

doi:10.3969/j.issn.2097-0706.2023.12.010

Abstract

Abstract:

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.

Key words: gas turbine combined cycle, solar energy, integrated solar combined cycle, performance analysis, complementary coupling, simulation

CLC Number:

TK12：TK123

GENG Zhi, CHEN Keyu, LIU Yuanyuan, ZHANG Bin, WANG Jianli, SHI Tianqing, LI Fang, GU Yujiong. Complementarity analysis of solar energy and gas turbine combined cycle[J]. Integrated Intelligent Energy, 2023, 45(12): 79-86.

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工质	压力/kPa	温度/℃	流量/(kg·s^-1)
空气	100	20.0	500
天然气	1 000	20.0	10
烟气	100	600.9	510

项目	数值
燃气轮机发电功率/MW	167.059
蒸汽轮机发电功率/MW	100.099
联合循环发电功率/MW	267.158
燃气轮机发电效率/%	24.9
循环热效率/%	39.8
排烟温度/℃	83.374

项目	参数	数值
环境参数	DNI/ (W·m^-2)	1 000
环境参数	大气环境温度/℃	20
系统运行参数	燃气轮机发电功率/MW	215.205
	蒸汽轮机发电功率/MW	138.065
	总发电功率/MW	353.270
	循环热效率/%	44.1
	排烟温度/℃	65.249

大气环境温度/℃	燃机高压空气温度/℃	燃机输出电功率/MW
-5	570.720	214.300
0	571.641	214.495
5	572.526	214.682
10	573.379	214.862
15	574.201	215.036
20	575.000	215.205
25	575.793	215.372
30	576.644	215.551
35	570.528	214.138