【摘要】 常规超临界二氧化碳燃煤发电系统缺乏快速精确的锅炉气温控制方法,锅炉热效率和?效率较低。对此,提出了1种改进的一次再热分流再压缩超临界二氧化碳燃煤发电系统。采用Aspen Plus建立了原系统和改进系统的稳态模型,对2种系统进行了详细的?分析对比研究。此外,还对新系统的锅炉喷气减温方法的调温特性进行了研究。结果表明:与原系统相比,新系统的锅炉?效率和系统?效率分别为53.41%和48.24%,分别增加了2.76百分点和2.32百分点,提高均很显著;新系统中一次气和二次气2级喷气减温点A1和A2、B1和B2的气温调节范围分别为0～16.96℃、0～19.44℃、0～19.43℃和0～21.03℃,能够满足锅炉工质温度快速精确调节的要求。更多还原

【Abstract】 The conventional co-fired power generation system using supercritical carbon dioxide（S-CO₂） cycle is lack of rapid and accurate boiler working fluid temperature control method, and the boiler’s thermal efficiency and exergy efficiency is relatively low. To solve this problem, this paper proposes an improved recompression and reheat S-CO₂ cycle for coal-fired power plant. The steady-state models of the original system and the improved system are established using Aspen Plus. Systematic comparisons between the two cycle systems are performed based on the exergy analysis method. In addition, the temperature-regulating characteristics of the spray attemperator of the improved system are studied. The results show that, compared with the original system, the boiler exergy efficiency and system efficiency of the improved system are 53.41% and 48.24%, respectively, which increases by 2.76 and 2.32 percentage points, both grow significantly. The temperature adjustment ranges of the boiler working fluid of A1 and A2, B1 and B2 in the improved system are 0～16.96 ℃, 0～19.44 ℃, 0～19.43 ℃ and 0～21.03 ℃, respectively, which can meet the requirements of rapid and accurate adjustment of boiler working fluid temperature.更多还原