Study on Heliostat Field Layout of Solar Power Tower Plant

doi:10.12096/j.2096-4528.pgt.21094

Abstract

Abstract:

Three tower heliostat field layouts, EB, No blocking-dense, and DELSOL derived from the radial staggered layout and the principle of no blocking loss, were studied. After summarizing the mathematical models of the three heliostat field layouts, combined with some design parameters of Gemasolar power tower plant, the software SolarPILOT was used to model and simulate the heliostat field according to the three layout modes. MATLAB was used to process the coordinate data of the heliostat field obtained by the modeling, and the change curves of radial spacing and azimuth spacing were obtained, so as to verify the rationality of the three layout mathematical models. The layout rules of the heliostat ring were obtained by analyzing the arrangement characteristics of the basic ring and the staggered ring in each heliostat field. At the same time, the performance of different layouts was compared from the number of heliostats, the optical efficiency, the land utilization ratio and the receiving energy of the heliostat field, and their advantages and disadvantages were analyzed. The results show that in the range of 1 000 m radius of the heliostat field, the average annual optical efficiency and land utilization rate of the heliostat field under the No blocking-dense layout are the highest, followed by the EB layout. However, the number of the heliostats and the receiving energy of the heliostat field under the EB layout are the largest, and the performance characteristics of the DELSOL layout are the lowest.

Key words: solar thermal power generation, solar power tower plant, heliostat field layout, radial spacing, azimuth spacing

CLC Number:

TK51

Hao SUN, Bo GAO, Jianxing LIU. Study on Heliostat Field Layout of Solar Power Tower Plant[J]. Power Generation Technology, 2021, 42(6): 690-698.

Figures/Tables 9

Tab. 1 Partial public parameters of Gemasolar power plant

类别	参数	数值
资源环境	纬度/(°)	37.42
	经度/(°)	−5.90
	年均DNI/(kW∙h/m²)	2 172
	年均环境温度/℃	18.4
	设计点逐时DNI(W/m²)	917
定日镜场	定日镜高度/m	12.305
	定日镜宽度/m	9.752
	定日镜面积/m²	120
	定日镜数量/面	2 650
	反射面积与总结构面积之比	0.960
集热系统	吸热塔光学高度/m	147
	吸热器高度/m	14.220
	吸热器直径/m	8.890
	涂层吸收率/%	95.0
发电模块	汽轮发电机额定功率/MW	19.9
	汽轮机循环热效率/%	37.5
	发电机效率/%	87.5

Fig.1 Schematic illustration of DELSOL layout

Fig.2 Schematic illustration of EB layout

Fig.3 Schematic illustration of No blocking-dense layout

Fig.4 Radial spacing diagram

Fig.5 Azimuth spacing diagram

Fig.6 Average annual efficiency of heliostat field under different layouts

Fig.7 Land utilization ratio and area of heliostat field, and total area of heliostat under different layouts

Fig.8 Received energy of different layout heliostats at a typical day

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