太阳能互补联合循环（ISCC）系统被认为是高效利用太阳能与化石能源的最有前景的途径之一。然而，由于目前缺乏对太阳能互补集成系统的普适性分析与评价，导致统一评价体系下不同集成系统方案之间的直接性能对比难以实现。鉴于此，首先提出并建立一套具有普适性的ISCC系统理论模型，该模型涵盖了太阳能集成到布雷顿循环与朗肯循环的不同耦合方案，对不同集成系统进行合理概括。基于（火用）分析理论推导得到统一性评价指标——燃料节省因子理论表达式，并对其进行验证，运用该评价方法对不同集成方案进行横向性能评估。然后基于能量品位耦合思想，利用统一表达式中的桥接项揭示了ISCC系统集成中的“分配效应”，即分配给布雷顿循环和朗肯循环的总输入（（火用））比例因太阳能投入位置的不同而改变。最后扩展了前期工作提出的“叠加效应”在ISCC系统中的应用，说明系统总燃料节省因子由代表太阳能投入带来直接效益的基本项、代表太阳能投入对系统中各组件浮动影响的浮动项和代表太阳能投入后隐含的循环间影响的桥接项叠加综合决定，包括太阳能局部整合的直接影响和各部分之间的相互影响。该研究结果具有普适性，为未来复杂太阳能互补多循环系统研究应用提供理论指导。

Integrated Solar Combined Cycle (ISCC) system is considered as a promising route to utilize both solar energy and fossil fuel. However, due to the absence of a unified framework and universal analysis of ISCC, it is difficult to achieve direct performance comparison between different integrated system schemes under the unified evaluation system. In the present work, a generalized model of ISCC system was proposed and established, which covered various integration schemes of solar energy taken into the Brayton and the Rankine cycles and the different integrated systems were reasonably summarized. Based on the model, the unified expression of fuel-savability was derived. The expression was verified and applied to evaluate the lateral performance of different integration schemes. Secondly, based on the idea of energy grade coupling, the "allocation effect" in ISCC system integration was revealed by using the bridge term in the unified expression, that is, the proportion of the total input (exergy) allocated to the Brayton cycle and Rankine cycle changes due to the different positions of solar energy input. Thirdly, based on previous work, the "superposition effect" was expanded that the total system fuel-savability was comprehensively determined by the superposed sum of the basic term, which was the direct benefit of local solar integration, the floating term, which stood for the explicit influence of solar integration on each main component, and the bridging term, which stood for the implicit inter-cycle influence of solar integration. This work provides theoretical guidance for the research and application of more generalized multi-cycle systems integrated with solar energy.

0 引言

1 理论建模与推导

   1.1 ISCC系统理论模型

   1.2 燃料节省因子的推导

2 结果与讨论

   2.1 燃料节省因子统一表达式的物理含义

   2.2 燃料节省因子的分配效应

   2.3 燃料节省因子的叠加效应

   2.4 统一表达式中各项之间关系

   2.5 验证燃料节省因子统一表达式

3 结论