基于分析法抽汽压损对机组经济性的影响  

Influence of extraction steam pressure loss on unit economy based on exergy analysis

作　　者：王富兴[1] 忻炜[1] 房林铁[2] 

机构地区：[1]中石化天津分公司动力部,天津300270 [2]华北电力大学电站设备状态监测与控制教育部重点实验室,河北保定071003

出　　处：《华北电力大学学报（自然科学版）》2011年第6期85-90,共6页Journal of North China Electric Power University：Natural Science Edition

摘　　要：抽汽压损是一种不明显的热力损失,使蒸汽的作功能力下降、热经济性降低。首先定性分析抽汽压损对机组经济性的影响,根据的物理意义定义锅炉效率、机组效率、发电耗率的数学表达式;由小扰动理论和微分理论,建立抽汽压损变化对抽汽量影响的微分关系式,以及锅炉效率、机组效率、发电耗率变化与抽汽量变化的微分关系式。结合N1000-25/600/600机组,定量分析抽汽压损变化对锅炉效率、机组效率、发电耗率的影响。Extraction steam pressure loss is a subtle thermal power loss,but it will lead to decrease in working capacity of steam and thermal economy of a power plant.Firstly,it makes qualitative analysis on the influence of extraction steam pressure loss upon unit economy,and mathematical formulae for the boiler exergy efficiency,the unit exergy efficiency,and exergy consumption rate were defined.On the basis of the small perturbation theory and differential theory,this paper established differential relationship between extraction steam pressure loss and extraction flow,as well as differential relationship between the change of extraction flow and the change of the boiler exergy efficiency,the unit exergy efficiency,and exergy consumption rate.And finally,this paper analyzed the quantitative on the influence of extraction steam pressure loss upon the boiler exergy efficiency,the unit exergy efficiency,exergy consumption rate on N1000-25/600/600 unit.

关 键 词：微分关系式 抽汽压损 经济性 效率 

分 类 号：TK212[动力工程及工程热物理—动力机械及工程]