作　　者： (周永芳）; (时章明）; (刘波）;

机构地区： 湖南节能评价技术研究中心

出　　处： 《热能动力工程》 2017年第S1期21-27,127,共8页

摘　　要： 火用分析法是目前较为普遍使用的火电机组能耗评价方法,但常规火用分析法是以理想过程作为分析基础的,不能对火电机组进行正确的节能降耗指导。本文分析了不可避免的火用损失的存在性,结合有限时间热力学建立了火电机组不可避免火用损失模型,以某600 MW机组为例,计算循环的最大吸热温度与最小放热温度为469.2℃、9.2℃,与实际吸、放热温度相差46.7℃、7.7℃。推导得到回热循环各换热器火用损失最小的最佳流速,均已超过实际流速。计算了锅炉、凝汽器、回热加热器的不可避免火用损失与实用火用损失,并与常规火用分析法进行比较。 Exergy analysis method is a commonly used energy consumption evaluation method for thermal power unit. However,the conventional analysis is based on ideal process,and sometimes it cannot provide meaningful guidance.Once the inevitable exergy loss of thermal process is defined,the thermal power unit inevitable exergy loss analysis model can be established according to the finite time thermodynamics. In this paper,a power plant 600 MW unit is taken as an example. The optimal heat temperature and the minimum heat release temperature of the simple steam power cycle are 469. 2 ℃ and 9. 2 ℃,that is,46. 7 ℃ and 7. 7 ℃ different from the actual endothermic temperature and exothermic temperature. The optimal velocity,derived from the minimum exergy loss of regenerative cycle heat exchanger in thermal power unit,is greater than the actual velocity. At last,the inevitable exergy loss and practical exergy loss of the boiler,condenser,and regenerative heater are calculated,and conventional exergy analysis method is used for comparison.

关 键 词： 火电机组 不可避免火用损失 有限时间热力学 动力循环 回热循环