Page 34 - Design of Solar Thermal Power Plants

1.2 BRIEF INTRODUCTION TO SOLAR THERMAL POWER GENERATION 27

a thermal collection method. For dish-Stirling, the concentration ratio is
600e3000, operational temperature is up to 750 C, and solar dish-Stirling

net efficiency of converting peak solar energy into power is up to 30%. The
dish-Stirling system features less power, normally 5e50 kW. Thus it can
be used independently as the distributed power generation system in
remote areas as well as being incorporated into an MW-level power plant
for grid-connected power generation.
1.2.2.4 Liner Fresnel Reflector Solar Power Generation
Linear Fresnel reflector (LFR) solar power generation (Fig. 1.15)isa
system that concentrates solar beam radiation into a receiver tube
mounted at the focal point of the Fresnel mirror through the FLR mirror
tracking of the movement of the sun and generates high-temperature
working media for thermal cycle power generation. Major components
of LFR power generation include the liner reflective mirror, receiver tube,
and transmission system. The LFR power generation system is a simpli-
fied parabolic trough power generation system. The parabolic trough
concentrator is replaced by a surface mirror; the mirror features a small
distance to ground, low wind load, a simple structure, an intensive layout,
and higher land-use efficiency; furthermore, vacuum treatment for the
receiver tube is not necessary, thus reducing technical difficulties and
costs. The total cost of the system is comparatively low. However, due to
the system’s low concentration ratio, the operational temperature stays
low, resulting in low system efficiency as well.
Multiple CSP generation modes are compared in Table 1.4.

FIGURE 1.15 Linear Fresnel reflector solar power generation. Picture provided by
Himin Solar Energy Co., Ltd., CHINA, 2010.