扩容蒸发式光煤互补发电系统变辐照特性研究
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摘要
为避免槽式太阳能集热器内变热流量传热和汽液非均匀分布产生,提出了扩容蒸发式太阳能蒸汽发生系统。采用NASA SSE6.0数据库收集的辐照数据,将扩容蒸发式太阳能直接蒸汽发生系统与燃煤机组互补组成复合发电系统,建立复合发电系统的变工况计算模型,并以600 MW机组为例进行了复合发电系统变辐照情况下的日、月、年热力性能分析。研究结果显示:复合发电系统日发电功率与辐照强度曲线变化趋势类似,各月复合发电系统的发电量呈现出夏季较高的趋势,6月份达到峰值2.95×10~8 kW·h,集热场效率与其趋势相反,机组热功转换率夏季较高,全年为32%～35%;太阳能平均热功转换效率为22.5%,研究结果可为太阳能与燃煤机组互补发电系统的工程应用提供新的方向和思路。
To avoid heat flux variations and non-uniform vapor-liquid distribution in parabolic collectors, the volume expanding evaporative solar steam generation system is proposed. Using actual solar radiation data from NASA SSE6.0 database, a 600 MW coal-fired power plant hybrid with a volume expanding evaporative steam generation system was established. Turbine stages at offdesign condition were calculated with DNI data over a one-year period. And the daily, monthly and yearly thermodynamic performance of the hybrid system in Lhasa area was analyzed respectively. The results exhibit the same trends in steam mass flow,daily power generation and DNI with the monthly power generation reaching the maximum in June(2.95×10~8 kW·h of electric energy produced), while the solar collector efficiency shows the opposite tendency. Moreover, the cycle thermal efficiency of power generation is relatively higher in summer, which typically ranges from 32% to 35% throughout the whole year. Annual solar thermal efficiency is approximately 22.5% by average. The results may provide a novel direction toward the application of solar energy system hybrid with coal-fired power generation.
To avoid heat flux variations and non-uniform vapor-liquid distribution in parabolic collectors, the volume expanding evaporative solar steam generation system is proposed. Using actual solar radiation data from NASA SSE6.0 database, a 600 MW coal-fired power plant hybrid with a volume expanding evaporative steam generation system was established. Turbine stages at offdesign condition were calculated with DNI data over a one-year period. And the daily, monthly and yearly thermodynamic performance of the hybrid system in Lhasa area was analyzed respectively. The results exhibit the same trends in steam mass flow,daily power generation and DNI with the monthly power generation reaching the maximum in June(2.95×10~8 kW·h of electric energy produced), while the solar collector efficiency shows the opposite tendency. Moreover, the cycle thermal efficiency of power generation is relatively higher in summer, which typically ranges from 32% to 35% throughout the whole year. Annual solar thermal efficiency is approximately 22.5% by average. The results may provide a novel direction toward the application of solar energy system hybrid with coal-fired power generation.
引文
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[2]HU E,YANG Yongping,AKIRA N,et al.Solar thermal aided power generation[J].Applied Energy,2010,87(9):2881-2885.
[3]YANG Yongping,YAN Qin,ZHAI Rongrong,et al.An efficient way to use medium-or-low temperature solar heat for power generation-integration into conventional power plant[J].Applied Thermal Engineering,2011,31(2-3):157-162.
[4]YOU Y,HU E J.A medium-temperature solar thermal power system and its efficiency optimization[J].Applied Thermal Engineering,2002(22):357-64.
[5]LI Yuanyuan,ZHOU Luyao,HU Eric,et al.Comparison in net solar efficiency between the use of concentrating and non-concentrating solar collectors in solar aided power generation systems[J].Applied Thermal Engineering,2015,75:685-691.
[6]HOU Hongjuan,YU Zhenyue,YANG Yongping,et al.Performance evaluation of solar aided feedwater heating of coal-fired power generation(SAFHCPG)system under different operating conditions[J].Applied Energy,2013,112(0):710-718.
[7]YANG Yongping,ZHAI Rongrong,ZHU Yong,et al.The evaluation of solar contribution in solar aided coal-fired power plant[J].International Journal of Photoenergy,2013(1):5707-5719.
[8]段立强,余晓辉,王步云,等.塔式光煤互补系统变工况性能研究[J].工程热物理学报,2018,39(3):476-483.DUAN Liqiang,YU Xiaohui,WANG Buyun,et al.Study on offdesign performance of tower solar energy aided coal-fired power generation system[J].Journal of Engineering Thermophysics,2018,39(3):476-483.
[9]ZHAO Yawen,HONG Hui,JIN Hongguang.Evaluation criteria for enhanced solar-coal hybrid power plant performance[J].Applied Thermal Engineering,2014,73(1):577-587.
[10]许璐,彭烁,洪慧,等.330 MW光煤互补发电系统变辐照变工况性能研究[J].中国电机工程学报,2014,34(20):3347-3354.XU Lu,PENG Shuo,HONG Hui,et al.Off-design performance of a typical 330 MW solar hybrid coal-fired power generation system[J].Proceedings of the CSEE,2014,34(20):3347-3354.
[11]赵雅文,洪慧,金红光.中温太阳能升级改造火电站的变辐照性能分析[J].工程热物理学报,2010,31(2):213-217.ZHAO Yawen,HONG Hui,JIN Hongguang.Off-design performance of repowered coal-fired power plant by low-grade solar heat with varying direct normal solar radiation[J].Journal of Engineering Thermophysics,2010,31(2):213-217.
[12]彭烁,周贤,王保民.光煤互补发电系统研究综述[J].中国电力,2017,50(9):52-58.PENG Shuo,ZHOU Xian,WANG Baomin.Overview of the hybrid solar coal power system[J].Electric Power,2017,50(9):52-58.
[13]BELGROUN Z,ABBAS M,ABURIDAH H.Assessment of a solar parabolic trough power plant for electricity generation under mediterranean and arid climate conditions in Algeria[J].Energy Procedia,2013,42:93-102.
[14]CHAMBERS T,RAUSH J,RUSSO B.Installation and operation of parabolic trough organic rankine cycle solar thermal power plant in south louisiana[J].Energy Procedia,2014,49:1107-1116.
[15]MOKHEIMER E M A,DABWAN Y N,HABIB M A,et al.Technoeconomic performance analysis of parabolic trough collector in Dhahran,Saudi Arabia[J].Energy Conversion and Management,2014,86(0):622-633.
[16]RINALDI F,BINOTTI M,GIOSTRI A,et al.Comparison of linear and point focus collectors in solar power plants[J].Energy Procedia,2014,49(0):1491-1500.
[17]江承潮,王培红,郝勇生,等.光煤互补发电系统集成方案研究与性能分析[J].太阳能学报,2018,39(4):988-995.JIANG Chengchao,WANG Peihong,HAO Yongsheng,et al.Integration scheme research and performance analysis of solar aided coal-fired power generation system[J].Acta Energiae Solaris Sinica,2018,39(4):988-995.
[18]王志峰.中国太阳能热发电产业发展战略及部署规划研究[R].北京:中科院电工所,2013
[19]ODEH S D.Unified model of solar thermal electric generation systems[J].Renewable Energy,2003,28:755-767.
[20]ECK M,STEINMANN W D.Modeling and design of direct solar steam generating collector fields[C]//ASME 2004 International Solar Energy Conference.American Society of Mechanical Engineers,2004:615-624.
[21]安连锁,徐玫,陈海平,等.太阳能辅助加热系统对蒸汽动力机组运行性能的扰动研究[J].中国电机工程学报,2014,25(1):142-149.AN Liansuo,XU Mei,CHENG Haiping,et al.A study of the disturbance in steam power unit caused by solar auxiliary heating system[J].Proceedings of the CSEE,2014,25(1):142-149.
[22]POWELL K M,EDGAR T F.Modeling and control of a solar thermal power plant with thermal energy storage[J].Chemical Engineering Science,2012,71:138-145.
[23]MANENTI F,RAVAGHI-ARDEBILI Z.Dynamic simulation of concentrating solar power plant and two-tanks direct thermal energy storage[J].Energy,2013,55:89-97.