多效率扰动下复杂热力系统能效分析与评价方法  

Energy Efficiency Analysis and Evaluation Methods for Complex Thermal Systems Under Multiple Efficiency Perturbations

作　　者：陈海平[1] 薛凯丽 张衡[1] CHEN Haiping;XUE Kaili;ZHANG Heng(School of Energy,Power and Mechanical Engineering,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学能源动力与机械工程学院,北京102206

出　　处：《动力工程学报》2022年第9期865-872,共8页Journal of Chinese Society of Power Engineering

基　　金：国家重点研发计划资助项目(2018YFB0604300);国家自然科学基金资助项目(51976058)。

摘　　要：为探究各子系统分效率同时变化对总系统热效率的影响规律及其权重大小,以火电机组热力系统为对象,基于热力学第一定律,通过严谨的理论推演,导出多效率变化模式下的复杂热力系统能效分析与评价的计算模型。结果表明:当多个子系统或热力设备的分效率同时变化时,全厂热效率的相对变化率等于相关子系统或热力设备分效率的相对变化率之和。通过不同边界条件下的误差分析,验证该模型完全满足工程实际要求。Thermal system of thermal power units was taken as the object to exploring the influence law of simultaneous changes in sub-system efficiencies on total system thermal efficiency and the size of their weights.Based on the first law of thermodynamics,a computational model for analysis and evaluation of energy efficiency of complex thermal systems under multiple efficiency change modes was derived through rigorous theoretical deduction.Results show that when sub-efficiencies of multiple sub-systems or thermal equipments change simultaneously,the relative rate of change in whole plant thermal efficiency is equal to the sum of the relative rates of change in relevant sub-systems or thermal equipment sub-efficiencies.Through the error analysis under different boundary conditions,it is verified that the model fully meets actual engineering requirements.

关 键 词：复杂热力系统 效率 能效分析 评价 节能 

分 类 号：TK123[动力工程及工程热物理—工程热物理]