太阳能热风发电系统性能参数数值模拟

Numerical simulation on performance parameters of solar power plant system

为了全面衡量太阳能热风发电系统的性能,在常用热平衡方程的基础上,增加压力方程和理想气体状态方程,建立了太阳能热风发电系统中集热棚和烟囱的一维可压缩瞬态模型,计算系统内气流的温度、压力和密度分布,由此得出的系统总压差动态变化与相关文献的实际测量值基本一致。利用该模型分析烟囱形状参数对烟囱效率的影响,结果表明:烟囱效率随烟囱高度和烟囱直径的增加而增大;采用渐缩形烟囱会降低烟囱效率,而采用渐扩形烟囱会提高了烟囱效率且随烟囱倾角增大烟囱效率增加,但渐扩形烟囱倾角达到极值后再进一步增大时,烟囱效率几乎不再发生变化。

To comprehensively measure performance of the solar power generation system, based on the commonly used heat balance equations, the pressure equations and ideal gas status equations were added to establish the one dimensional compressible transient model for heat collecting shed and chimney in the solar power generation system. This model can calculate the distributions of temperature, pressure and density of the gas flow, it shows the dynamic variations of the total pressure difference of the system are in agreement with the literature test data. Moreover, this established model was applied to investigate the effects of structural parameters of the chimney on the chimney efficiency. The results show that, the chimney efficiency increases with the chimney height and diameter dramatically. Using convergent shape will decrease the chimney efficiency while the divergent shape can increase the chimney efficiency. However, when the chimney tilt angle further increases when it reaches the peak value, the chimney efficiency changes little.