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Parabolic-Trough Technology Roadmap January 1999 ÿ Direct Steam Generation For a number of years it has been proposed that parabolic-trough systems will benefit in both performance and cost from generation of steam directly in the solar field, eliminating the expensive heat transfer fluid, the thermodynamic disadvantages of an intermediate heat transport system between the solar field and power block, and the HTF-to-steam heat exchangers. Although there are both pros and cons to this approach, it has generally been viewed positively by LUZ and the current trough development community. An important prototype development is currently under way at the Plataforma Solar de Almería, albeit limited in scope to one to two rows of collectors. Because some flow-instability studies have suggested that instabilities between a higher number of parallel rows may be the most important concern, further prototype systems may be required after testing at the PSA. PLANT DESIGN OPTIMIZATION Suppliers of power plant technologies have identified a number of approaches for reducing the cost of conventional power plants. These include a focus on simplifying the design, using standard off- the-shelf components, minimizing field construction requirements, and developing standard designs. Yet the current SEGS plants are a mixture of complex and custom system designs. Very little standardization exists between the solar field, HTF system, and steam cycle designs. Valves, piping, and instrumentation are often different. Although LUZ made significant efforts to reduce complexity at the later plants (eliminating flow balance valves at SEGS IX and simplifying the steam plant design through elimination of the gas boiler), significant opportunities exist for design improvement. ÿ Plant DFMA Methodology DFMA is a design review process used to simplify designs and to reduce the cost of a design. DFMA focuses on minimizing part count, eliminating custom or specialized components, and minimizing manufacturing steps. In the case of parabolic trough plants, this process could benefit many steps of the design, manufacture, and construction of a plant. In add-ition, the DFMA process should examine design issues that will affect the operation and maintenance of the plant. A formal DFMA study would seek opportunities to minimize the use of any unique or specialized components to minimize the number of sizes and vendors and attempt to standardize commodity items such as piping, valves, valve actuators, and instrumentation. In Figure 12. Power block piping Page 25PDF Image | A Pathway for Sustained Commercial Development and Deployment of Parabolic Trough Technology
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