热力发电Issue(5)：54-58,64,6.DOI:10.3969/j.issn.1002-3364.2014.05.054
各因素测量不确定度对锅炉热效率测试质量的影响
Effect of measurement uncertainty on test quality of boiler thermal efficiency
吕当振 1段学农 1陈一平 1焦庆丰 1杨剑锋1
作者信息
- 1. 湖南省电力公司科学研究院，湖南 长沙 410007
- 折叠
摘要
Abstract
The analysis theory of uncertainty and the assessment method of uncertainty factors in type A and type B were introduced.The uncertainty analysis model of boiler thermal effciency was established.Moreover,the calculation methods of sensitivity coefficient,normal combined uncer-tainty and extended uncertainty were put forward.On this basis,a 600 MW unit coal-fired boiler was taken as the example to investigate the effects of each factor's measurement uncertainty on test quality of the boiler thermal efficiency.To avoid the secondary measurement uncertainty,the uncertainty factors with incompletely independence and the sensitivity coefficient by conventional imprecise numerical calculus were eliminated.The results indicates that,the parameters having significant contributions to test quality of the boiler thermal efficiency are unburned carbon con-tent in fly ash (Cfh ),average exhaust temperature (tpy ),ash content as-received basis (Aar ),low heating value as-received basis(Qnet,ar )and fly ash content(Əfh ),in a decreasing order;and the neg-lectable parameters are nitrogen content as-received basis (Nar ),sulfur content as-received basis (Sar)and surface radiation and convection loss(Q5 ).Therefore,in order to improve the test quality of boiler thermal efficiency distinctly,it is worthwhile to lower the uncertainty of the significant parameters.关键词
锅炉/热效率/不确定度模型/灵敏系数/二次不确定度Key words
boiler/heat efficiency/uncertainty model/sensitivity coefficient/secondary measure-ment uncertainty分类
能源科技引用本文复制引用
吕当振,段学农,陈一平,焦庆丰,杨剑锋..各因素测量不确定度对锅炉热效率测试质量的影响[J].热力发电,2014,(5):54-58,64,6.
