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Inventory Control Assessment for Small Scale Sco2 Heat to Power Conversion Systems

Energy(2022)SCI 1区SCI 2区

Brunel Univ London

Cited 11|Views16
Abstract
The control of the main cycle parameters in supercritical CO2 (sCO(2)) systems during off-design and transient operation is crucial for advancing their technological readiness level. In smaller scale power units (<0.5-5 MW), costs and complexity constraints limit the number of auxiliary components in the power loop, making the design of the control system even more challenging. Among the possible strategies, the regulation of system inventory, which consists in varying the CO2 fluid mass in the power loop to achieve a given control target, represents a promising alternative. Such technique however poses several technical challenges that are still to be fully understood. To fill this gap, this work presents a comprehensive steady-state and transient analysis of inventory control systems, referring in particular to a 50 kW sCO(2) test facility being commissioned at Brunel University. Stability implications (e.g. pressure gradients in the loop) and the effects of variable inventory tank size are discussed. Tank volumes 3 times higher than the one of the power loop (including the receiver) can lead to a higher controllability range (+/- 30% of the nominal turbine inlet temperature) and an extended availability of the control action (slower tank discharge). A PI controller is also designed to regulate the turbine inlet temperature around the target of 465 degrees C in response to waste heat variations.
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Key words
Supercritical CO 2 power cycles,Waste heat recovery,Inventory control,Transient analysis,sCO 2 power cycle controls,Control design
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要点】:本文研究了在超临界CO2(sCO2)小规模热电转换系统中,通过调节系统库存量(即改变CO2流体质量)来实现控制目标的策略,并分析了稳定性和控制效果。

方法】:作者采用稳态和瞬态分析相结合的方法,针对Brunel大学正在建设的50 kW sCO2测试设施进行了研究。

实验】:实验在50 kW sCO2测试设施上进行,研究了不同库存罐体积(是功率回路体积的三倍)对控制范围和动作持续时间的影响,并设计了一个PI控制器来调节涡轮入口温度,使其在废热变化时保持在465摄氏度的目标温度附近。