摘要
为了提高太阳能热发电站的发电效率,提出了耦合空气轮机、汽轮机及热力塔为一体的太阳能发电系统。在该系统中,吸热器吸收的太阳能加热压气机所压缩的高压空气,多余的热量被储存在储热装置中以在无阳光的时候维持电站正常运转。被加热后的高压空气驱动透平后排入余热锅炉产生蒸汽驱动汽轮机,余热锅炉的排气以及冷却汽轮机凝汽器的空气进入热力塔底部驱动风力涡轮。本文建立了该系统的热力学模型并对系统效率作了计算,计算中对水蒸汽动力循环的参数做了优化。计算结果表明,该系统相比传统的太阳能热电站发电效率明显提高,在环境温度为15℃、空气轮机组透平进口温度为700℃、热力塔高度400 m以上时,空气轮机工作在有回热热效率高的工作模式下,系统循环效率超过了50%,该太阳能电站总的能量转换效率将可达到33%。
In order to improve the power generation efficiency of solar thermal power station,a solar power generation system integrating air turbine,steam turbine and thermal tower is proposed.In this system,the solar energy absorbed by the heat absorber heats the compressed high-pressure air of the compressor,and the excess heat is stored in the layered heat storage device to maintain the normal operation of the power station when there is no sunlight.The heated high-pressure air drives the turbine to be discharged back into the waste heat boiler to generate steam to drive the turbine,and the exhaust of the boiler and the air cooling the turbine condenser enter the bottom of the thermal tower to drive the wind turbine.In this paper,the thermodynamic model of the system is established and the efficiency of the system is calculated.The parameters of the steam power cycle are optimized in the calculation.The calculation results show that the efficiency of the system is obviously improved compared with the traditional solar thermal power station.When the ambient temperature is 15℃,the turbine inlet temperature of the air turbine unit is 700℃,and the height of the thermal tower is above 400 m,the system circulation efficiency exceeds 50%under the air turbine working mode with high regenerative thermal efficiency.The total energy conversion efficiency of the solar energy plant will reach 33%.
作者
李建锋
吕俊复
徐宁
LI Jian-Feng;LYU Jun-Fu;XU Ning(China Electricity Council,Beijing 100761,China;Key laboratory for Thermal Science and Power Engineering of Ministry of Education,Tsinghua University,Beijing 100084,China;Huadian Electric Power Research Institute,Hangzhou 310030,China)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2020年第6期1308-1317,共10页
Journal of Engineering Thermophysics
基金
国家自然科学基金项目(No.U1810126)。
关键词
太阳能热发电
联合循环
热力塔
热效率
solar thermal power station
combined cycle
thermal tower
thermal efficiency
