核-气联合循环发电系统性能仿真分析
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摘要
针对压水堆核电机组循环热效率较低及电网对核电调峰能力的需求,基于Ebsilon软件,在大亚湾核电站二回路热力系统模型基础上,建立核-气联合循环发电热力系统。以燃气轮机循环效率、联合循环效率作为热经济性指标,评价联合循环系统的性能,并分析环境温度、压力及燃气轮机负荷变化对系统性能的影响。结果表明:核-气联合循环系统热效率相比原核电机组提高13.15%,汽轮机输出功率增加75.49%,工作环境得到明显改善;环境温度降低或压力升高会提高燃气轮机效率及联合循环功率;燃气轮机降负荷时,通过补燃天然气可维持核蒸汽发生器进口温度不变,汽轮机仍有较高的输出功率,负荷可调节范围为56.57%～100%。
For the low cycle thermal efficiency of Pressurized Water Reactor(PWR)nuclear power units and the growing demand on the nuclear power peaking capacity of the power grid, using Ebsilon software, based on the thermodynamic system model of the secondary loop of Daya Bay Nuclear Power Station, the nuclear-gas combined cycle power generation thermodynamic system is established. Taking the gas turbine cycle efficiency and the combined cycle efficiency as the index of the heat economy, the performance of the combined cycle system is evaluated. At the same time, the effect of ambient temperature, pressure and gas turbine load on the system performance is analyzed. The results show that, the thermal efficiency of the nuclear-gas combined cycle system increased by 13.15% compared with the original nuclear power unit, the output power of the steam turbine increased by 75.49%, and the working environment of the steam turbine is improved obviously; The fall of ambient temperature will increase the efficiency and the power of the gas turbine, and the drop in ambient pressure will decrease the efficiency of the gas turbine and the combined cycle efficiency. When reducing the load of the gas turbine, the inlet temperature of nuclear reactor remains unchanged by afterburning the natural gas, and the steam turbine can still have high output power. The adjustable range of the load is from 56.57 % to 100%.
For the low cycle thermal efficiency of Pressurized Water Reactor(PWR)nuclear power units and the growing demand on the nuclear power peaking capacity of the power grid, using Ebsilon software, based on the thermodynamic system model of the secondary loop of Daya Bay Nuclear Power Station, the nuclear-gas combined cycle power generation thermodynamic system is established. Taking the gas turbine cycle efficiency and the combined cycle efficiency as the index of the heat economy, the performance of the combined cycle system is evaluated. At the same time, the effect of ambient temperature, pressure and gas turbine load on the system performance is analyzed. The results show that, the thermal efficiency of the nuclear-gas combined cycle system increased by 13.15% compared with the original nuclear power unit, the output power of the steam turbine increased by 75.49%, and the working environment of the steam turbine is improved obviously; The fall of ambient temperature will increase the efficiency and the power of the gas turbine, and the drop in ambient pressure will decrease the efficiency of the gas turbine and the combined cycle efficiency. When reducing the load of the gas turbine, the inlet temperature of nuclear reactor remains unchanged by afterburning the natural gas, and the steam turbine can still have high output power. The adjustable range of the load is from 56.57 % to 100%.
引文
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[3]SAYYAADI H,SABZALIGOL T.Various approaches in optimization of a typical pressurized water reactor power plant[J].Applied Energy,2009,86(7):1301-1310.
[4]王震华,刘晓东.核电与燃气轮机联合循环相组合的发电方式-TD循环技术[J].燃气轮机技术,1999,12(02):16-19
[5]DARWISH M A,AWADHI F M A,Amer A O B.Combining the nuclear power plant steam cycle with gas turbines[J].Energy,2010,35(12):4562-4571.
[6]KASILOV V F,DUDOLIN A A,GOSPODCHENKOV I V.The effectiveness of using the combined-cycle technology in a nuclear power plant unit equipped with an SVBR-100 reactor[J].Thermal Engineering,2015,62(5):322-328.
[7]周志伟,卞志强,杨孟嘉.中国市场核-气联合循环发电的经济潜力研究[J].核科学与工程,2004,24(3):200-204.
[8]陈文军,姜胜耀.中国发展小型堆核能系统的可行性研究[J].核动力工程,2013,34(2):153-156.
[9]WIBISONO A F,SHWAGERAUS E.Thermodynamic performance of Pressurized Water Reactor power conversion cycle combined with fossil-fuel superheater[J].Energy,2016,23(117):190-197.
[10]林汝谋,金红光,蔡睿贤.以燃气轮机为核心的多功能能源系统基本形式与构成[J].燃气轮机技术,2006,19(1):1-10.
[11]赵春,王培红.燃气-蒸汽联合循环热经济学分析评价指标研究[J].中国电机工程学报,2013,33(23):44-50.
[12]SHARMA M,Singh O.Exergy analysis of dual pressure HRSG for different dead states and varying steam generation states in gas/steam combined cycle power plant[J].Applied Thermal Engineering,2016,26(93):614-622.
[13]SAHIN A Z,AL-SHARAFI A,YILBAS B S,et al.Overall performance assessment of a combined cycle power plant:An exergo-economic analysis[J].Energy Conversion&Management,2016,28(116):91-100.
[14]庞力平,李瑞华,孙诗梦,等.塔式太阳能辅助1000MW燃煤发电机组锅炉的热力性能分析[J].中国电机工程学报,2017,37(5):1417-1425.
[15]赵世飞,徐钢,周璐瑶,等.新型氢氧-燃煤联合循环系统热力学性能分析[J].工程热物理学报,2015,36(12):2557-2561.
[16]林琳,张燕平,黄树红.600MW太阳能协同燃煤发电机组的变工况性能分析[J].动力工程学报,2013,33(10):795-802.
[17]范文楷.核电二回路热力系统分析[D].哈尔滨:哈尔滨工程大学,2013.