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Parabolic-Trough Technology Roadmap January 1999 SYSTEM DEVELOPMENT System development refers to all aspects of integrating solar and non-solar components and systems into a complete, fully integrated concentrating solar power plant product. Key areas of focus identified by the trough roadmap working group are solar power cycle optimization, design optimization, the development of standardized products, and improved integration of operation and maintenance activities. The key metrics for each of the system development areas focus are shown in Table 5. Time lines for various system development alternatives are shown in Figure 13. SOLAR POWER CYCLE OPTIMIZATION Power cycle optimization represents a significant opportunity for cost reduction and possibly performance improvement in future plants. Early SEGS plants basically used off-the-shelf power plant technology. At later SEGS plants, LUZ attempted to optimize the power cycle design through custom component selection. As a result, steam cycle efficiency was improved, parasitic electric consumption was reduced, and plant start-up improved. This resulted in the use of reheat steam turbine cycles and variable-speed pumps, for example. Additional improvements in plant efficiency and operation are thought to be possible through continued efforts in design integration. ÿ ISCCS Design Integration The ISCCS design represents one of the most important opportunities for near- term trough development. A small trough solar boiler added to a large combined-cycle system potentially offers significant advantages and represents a unique market niche. However, no detailed analysis has been performed to verify these assertions. A detailed design integration study is needed to look at turbine selection and performance issues, waste heat recovery unit design and operation, operating scenarios, and realistic emissions reduction potential. ÿ HTF System Design Optimization Figure 11. SEGS VI power block Hydraulic and heat loss analyses are needed to optimize the layout of the solar field. Replacing flex hoses with ball joint assemblies may allow more collectors to be located in a single collector loop. The field layout optimization should also reconsider the use of rows of collectors instead of loops of collectors to eliminate the crossover pipe. ÿ Rankine-Cycle Design Optimization In recent years, significant reductions in cost have been demonstrated in conventional Rankine- cycle power plants. Rankine-cycle trough plants need to take advantage of these cost reductions. In addition, further optimization of the integration between the solar plant and the steam plant are possible. Key focus areas are start-up time and parasitic electric consumption. Page 24PDF Image | A Pathway for Sustained Commercial Development and Deployment of Parabolic Trough Technology
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