2.0 mw含钠/熔盐中试系统设计

Kenneth Armijo, M. Carlson, D. Dorsey, J. Christian, C. Turchi
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引用次数: 1

摘要

硝酸熔盐聚光太阳能(CSP)系统目前在全球范围内部署,被认为是当今高温操作中最先进的传热流体(HTFs)。虽然熔盐可能会稍微高一些,但要完全实现SunShot的效率目标,即HTF为15美元/千瓦时,LCOE为6美分/千瓦时,HTF技术在更高温度(例如650°C至750°C)下工作,将需要替代熔盐,例如碱金属系统。本研究探索了2.0 MWth的钠接收器系统的开发,该系统采用钠接收器作为HTF,并以三元氯化物(20%NaCl/40%MgCl/40%KCl按mol wt.%)盐作为热能储存(TES)介质,以促进6小时的加热。存储时间。采用了钠-盐交换器模型和盐- sco2一次交换器模型并对其进行了评价。利用工程方程求解器(EES)建立了热力学系统设计模型,计算了中试规模电厂冷热腿入口和出口的状态属性。这项调查评估了接收器的性能,以及对泵和系统运行范围的系统效率研究。结果表明,高效的钠离子接收器具有较高的传热系数和较低的入射通量扩散要求。系统性能模型结果表明,当泵转速为2400 RPM时,在泵流量为90-120 GPM时,热泵和冷泵的TDH分别为260.1-307 ft和260.1-307 ft。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
System Design of a 2.0 MWth Sodium/Molten Salt Pilot System
Nitrate molten salt concentrating solar power (CSP) systems are currently deployed globally and are considered state-of the art heat transfer fluids (HTFs) for present day high-temperature operation. Although slightly higher limits may be possible with molten salt, to fully realize SunShot efficiency goals of $15/kWhth HTFs and an LCOE of 6¢/kWh, HTF technologies working at higher temperatures (e.g., 650 °C to 750 °C) will require an alternative to molten salts, such as with alkali metal systems. This investigation explores the development of a 2.0 MWth sodium receiver system that employs a sodium receiver as the HTF, as well as with a ternary chloride (20%NaCl/40%MgCl/40%KCl by mol wt.%) salt as a thermal energy storage (TES) medium to facilitate a 6-hr. storage duration. A sodium-to-salt heat exchanger model as well as a salt-to-sCO2 primary heat exchanger model are employed and evaluated in this investigation. A thermodynamic system design model was developed using Engineering Equation Solver (EES) where state properties were calculated at inlets and outlets along both hot and cold legs of the pilot-scale plant. This investigation assesses receiver performance as well as system efficiency studies for the pump and system operational ranges. Results found that high efficiency sodium receivers were found to have higher heat transfer coefficients and required far less spreading of incident flux. The system performance model results suggest that for a pump speed of 2400 RPM, respective hot and cold pump TDH values were determined to be 260.1–307 ft. and 260.1–307 ft for pump flow rates of 90–120 GPM.
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