太阳能热发电系统中腔式吸热器的光学性能

建立了球形、圆柱形、圆锥形和平顶圆锥形4种典型腔式吸热器与抛物面聚光器的三维模型,利用蒙特卡洛光线追踪法预测了4种典型腔式吸热器内部辐射能流的分布,其中球形吸热器内部的辐射能流分布均匀性最好,且辐射峰值最小,具有较好的光学性能。通过统计逸出腔口的反射光计算出这4种腔式吸热器的反射光损,其中球形吸热器的反射光损最小。在聚光器反射率为0.9,腔体内壁吸收率为0.9时,球形吸热器反射光损仅为0.66%,聚光器/球形吸热器的光学效率为88.9%。

The optical performance of the cavity receiver in the solar thermal power system

The 3D model of four typical cavity receivers(spherical,cylindrical,conical,flat-topped cone) and a parabolic concentrator are established.The Monte Carlo ray tracing method is applied to predict the radiation flux distribution in the four cavity receivers.The results reveal that the spherical receiver has the best optical performace because owe to the optimal uniform radiation flux distribution and the lowest peak value of radiation.Through the statistics of the reflected rays leaking from the aperture of the cavity receivers was used to calculate the light loss,the loss of reflected rays from the spherical receiver is the least.The reflected loss ratio is only 0.66% by spherical receiver when the reflectance of the concentrator is 0.9 and the absorptance of the cavity receiver inner surface is 0.9.The concentrator-receiver system finally get a high optical efficency of 88.9%.