煤基多联产系统热力与经济性分析

化工动力多联产系统作为一种高效和清洁的能源系统而备受关注。该文对3种不同集成特征的煤基化工动力多联产系统的热力和经济性能进行分析，揭示了多联产系统节能效果对系统经济性的影响关系。采用成本节约率CR作为系统经济性能的评价准则，合成反应新气无调整和合成过程未反应气部分循环的多联产系统能够取得最高的成本节约率为11.8%，是系统设备投资节约与系统节能效果均衡的结果，其中化工岛与动力岛之间能量利用的耦合改善了系统热力性能，起到关键作用。研究成果为多联产系统从技术和经济角度进行综合评价提供了分析方法。

Thermo-economic Analysis of Coal-based Polygeneration System

Polygeneration system for chemical and power co-production has been regarded as one of promising technologies to use fossil fuel more efficiently and cleanly. The thermodynamic and economic performances of three types of coal-based polygeneration system were investigated and the influence of energy saving on system economic performance was revealed. The primary cost saving ratio (CR) was presented as a criterion to evaluate economic advantages of poly- generation system, which represents the cost saving of polygeneration system compared with the single-product systems with the same products outputs. As a result, the system adopting un-reacted syngas partly recycled and removing the fresh gas shift process can get the optimal CR 11.8%, which results from the trade-off between the installed capital cost saving effect and the energy saving effect, and represents the optimal coupling relationship among chemical conversion, energy use and economic performance. The research results provide an evaluation method for polygeneration systems based on both technical and economic viewpoints.