典型超临界二氧化碳循环动态特性分析与比较

Analysis and Comparison of Dynamic Characteristics of Typical Supercritical Carbon Dioxide Cycle

超临界二氧化碳(sCO_(2))循环布局多样,为探究循环布局对系统动态特性的影响。本文搭建了sCO_(2)再压缩循环及其三种衍生循环的动态数学模型。在相同的外部条件下,以sCO_(2)再压缩循环布局为参照循环,在热源工质流量扰动,系统质量流量扰动以及负荷指令扰动三种不同情况下,重点比较四种循环布局中循环净功率的动态特性。结果表明,对sCO_(2)再压缩循环各部分的改造,均能有效地减少在两种流量扰动情况下循环净功率的扰动幅值,扰动幅值最低分别降至0.8%、26.5%;但也增大了循环净功率对负荷指令的响应时间,最高达到220 s。本文的研究结果为sCO_(2)循环动态特性分析及控制系统设计提供了理论参考。

Supercritical carbon dioxide(sCO_(2))cycle has various structures.A dynamic mathematical model of the sCO_(2) recompression cycle and its three derivative cycles has been established in this paper to explore the impact of cycle layout on the dynamic characteristics of the system.Under the same external conditions,using the sCO_(2) recompression cycle layout as a reference cycle,the dynamic characteristics of the cycle net power in the four cycle layouts were emphatically compared under three different conditions:heat source mass flow disturbance,total mass flow disturbance,and load command disturbance.The results show that the modification of each part of the sCO_(2) recompression cycle can effectively reduce the disturbance amplitude of the cycle net power under both mass flow disturbance conditions,with the minimum disturbance amplitude decreasing to 0.8%and 26.5%,respectively;However,it also increases the response time of the cycle net power to load command,reaching a maximum of 220 s.The research results provide a theoretical reference for the dynamic characteristics analysis and control system design of the sCO_(2) cycle.