An improved recompression S–CO₂ cycle for coal-fired power plant is proposed in order to improve boiler thermal efficiency, increase cycle exergy efficiency, and resolve issues of regulating the working fluid temperature of the boiler rapidly and effectively. The models for energy and exergy analyses are built. Systematic comparisons between the improved S–CO₂ cycle system and the original S–CO₂ cycle system are carried out based on the detailed energy and exergy analyses. The results suggest that the improved S–CO₂ cycle is excellent in both energy and exergy efficiencies, the thermal efficiency and exergy efficiency of the boiler in the improved S–CO₂ cycle system are 94.68% and 53.41%, respectively, which are 1.04% and 2.76% higher than those of the original S–CO₂ cycle system. The power efficiency of the improved S–CO₂ cycle system is higher than that of the original one, which are 48.06% and 47.89%, respectively. The exergy efficiency of the entire cycle system of the improved S–CO₂ cycle is 48.24%, which is 2.32% higher than that of the original S–CO₂ cycle. In addition, the spray attemperator performance is investigated. The boiler in the improved S–CO₂ cycle can regulate the working fluid temperature effectively.

为了提高锅炉的热效率，提高循环的火用效率，解决快速有效地调节锅炉工作流体温度的问题，提出了一种改进的燃煤电厂再压缩S-CO ₂循环方案。建立了能量和火用分析模型。基于详细的能量和火用分析，对改进的S–CO ₂循环系统与原始S–CO ₂循环系统进行了系统比较。结果表明，改进的S-CO ₂循环是同时具有优异的能量和有效能效率，在改进的锅炉的热效率和火用效率S-CO ₂循环系统分别为94.68％和53.41％，分别比原始S–CO ₂循环系统高1.04％和2.76％。改进后的S–CO ₂循环系统的功率效率高于原始系统，分别为48.06％和47.89％。改进的S–CO ₂循环的整个循环系统的火用效率为48.24％，比原始S–CO ₂循环的火用效率高2.32％。另外，研究了喷雾减温剂的性能。改进的S–CO ₂循环锅炉可以有效调节工作流体温度。