暖风器对锅炉热效率的影响特性分析  

Analysis on the Influence of Air Heater on Boiler Thermal Efficiency

作　　者：范庆伟[1] 董怀托 牟春华[1] 谢天[1] 

机构地区：[1]西安热工研究院有限公司,陕西西安710054 [2]广东粤电环保有限公司,广东广州510630

出　　处：《热能动力工程》2016年第3期70-74,140,共5页Journal of Engineering for Thermal Energy and Power

摘　　要：基于锅炉热平衡原理分析了投运暖风器对锅炉热效率的影响特性,在锅炉净效率和燃料效率定义的基础上给出了暖风器投运前后锅炉热效率的计算公式。对试验数据的分析表明:基于某200 MW机组试验数据,当采用锅炉净效率定义时,暖风器投运使锅炉热效率由92.37%降低到91.61%;而采用燃料效率定义时,锅炉热效率则由92.37%升高到92.62%,锅炉热效率相差1.01%。采用燃料效率的定义时,暖风器投运后锅炉热效率升高,相同输出热量情况下的燃料输入热量减少,计算结果能更好地反映锅炉输入燃料量的变化。The paper firstly makes the analysis on the influences of air heater on boiler thermal efficiency based on the principle of boiler heat balance,and then on the basis of the definitions of the boiler net efficiency and fuel efficiency the paper proposes a calculation formula for boiler thermal efficiency before and after air heater put into operation. The analysis on the test data indicates that for a 200 MW unit,as air heater put into operation,with the definition of boiler net efficiency the boiler thermal efficiency decreases from 92. 37% to 91. 61%,and with the definition of fuel efficiency the boiler thermal efficiency decreases from 92. 37% to 92. 62%. The difference between two kinds of boiler thermal efficiency is 1. 01%,which shows with the definition of fuel efficiency the boiler thermal efficiency will increase after air heater put into operation. With same heat output quantity,the heat input of fuel will decrease,so the calculation result can better reflect the changes of quantity of fuel entering the boiler.

关 键 词：燃料效率 净效率 暖风器 锅炉热平衡 

分 类 号：TK223[动力工程及工程热物理—动力机械及工程]