直接式槽式太阳能中高温蒸汽发生系统及其经济性分析

Economic Analysis of a Direct Solar Trough Medium &High Temperature Steam Generation System

设计了一种直接式槽式太阳能中高温蒸汽发生系统,并建立数学模型,提出了系统节煤量和蒸汽能源平均成本的概念,分析了系统热效率和蒸汽能源平均成本的影响因素。结果表明:当太阳辐射由100W/m^2增大至1 000W/m^2时,系统热效率从47.2%提高至66.3%,系统工质质量流量从0.07kg/s增大至1.05kg/s;当环境温度由15℃升高至33℃时,系统热效率从64.5%缓慢提高至64.7%,系统工质质量流量基本保持不变;当年辐射时间为3 200h时,直接式槽式太阳能中高温蒸汽发生系统的投资成本可降低至631.30$/kW,蒸汽能源平均成本最低可降至26.82$/t,使其具有更强的市场竞争力。

A direct solar trough medium ＆ high temperature steam generation system was designed, for which, a numerical model was established, following concepts were proposed, such as the levelized cost of steam energy and the amount of saved coal, etc. , while the factors influencing the system thermal efficiency and the steam energy levelized cost were analyzed. Results show that when the solar radiation rises from 100 W/m^2 to 1 000 W/m^2 , the thermal efficiency of system would increase from 47.2% to 66.3%, and the working fluid flow would increase from 0.07 kg/s to 1.05 kg/s. When the ambient temperature rises from 15 ℃ to 33 ℃, the thermal efficiency would increase slowly from 64.5% to 64.7%, while the fluid flow may remain basically unchanged. For an annual radiation time of 3 200 h, the investment cost of above direct solar trough medium ＆ high temperature steam generation system may be as low as 631.30 $/kW, and the levelized cost of steam energy can be reduced to 26.82 $/t, making the system have a strong market competitiveness.