PDF《燃煤机组全厂净热耗率不确定度分析》

第48 卷第3期热力发电Vol.

48 No.3

2019 年3月THERMAL POWER GENERATION Mar.

2019 收稿日期:2018-07-22 基金项目:中国华能集团有限公司总部科技项目(HNKJ13-H10) Supported by:Science and Technology Project of China Huaneng Group Co., Ltd. (HNKJ13-H10) 第一作者简介:常经纬(1985―),男,硕士,工程师,主要研究方向为燃煤机组性能试验,[email protected]. 燃煤机组全厂净热耗率不确定度分析 常经纬,赵永坚,田晓璇 (西安热工研究院有限公司,陕西 西安 710054) [摘要]基于不确定度分析原理建立了全厂净热耗率的不确定度评定模型,介绍了灵敏系数、合成 不确定度的计算方法.结合某

135 MW 燃煤机组的全厂性能试验,根据不确定度原理及计 算模型对全厂净热耗率测试的不确定度进行了评定.结果表明:各参数测量不确定度对全 厂净热耗率试验结果不确定度影响顺序为给水流量>

净输出功率>

主蒸汽温度>

高位发热 量>

给水温度>

再热蒸汽温度>

冷再热蒸汽温度>

排烟温度>

水分>

空气预热器出口氧量>

主 蒸汽压力;

而其他参数对试验结果不确定度的影响较小.根据不确定度的评定结果,可为 控制试验质量提出测点的布置与仪表的选择原则,并推荐了煤、灰、渣的取样方法. [关键词]全厂性能试验;

ASME PTC46;

热耗率;

锅炉;

锅炉效率;

汽轮机;

不确定度分析 [中图分类号]TK212 [文献标识码]A [DOI 编号]10.19666/j.rlfd.201807178 [引用本文格式]常经纬, 赵永坚, 田晓璇. 燃煤机组全厂净热耗率不确定度分析[J]. 热力发电, 2019, 48(3): 80-86. CHANG Jingwei, ZHAO Yongjian, TIAN Xiaoxuan. Uncertainty analysis of total plant net heat rate of a coal-fired unit[J]. Thermal Power Generation, 2019, 48(3): 80-86. Uncertainty analysis of total plant net heat rate of a coal-fired unit CHANG Jingwei, ZHAO Yongjian, TIAN Xiaoxuan (Xi'

an Thermal Power Research Institute Co., Ltd., Xi'

an 710054, China) Abstract: On the basis of the principle of uncertainty analysis, the uncertainty evaluation model of the total power plant'

s net heat rate was established, and the calculation methods of sensitivity coefficient and synthetic uncertainty were introduced. Combing with the performance test of a

135 MW coal-fired unit and according to the uncertainty principle and calculation model, the uncertainty of the overall power plant net heat rate test was evaluated. The results show that, the order of the influence of the uncertainty of each parameter on the uncertainty of the test results of the overall power plant'

s net heat rate is: feed water flow >

net power >

main steam temperature >

high calorific value >

feed water temperature >

reheat steam temperature >

cold reheat steam temperature >

exhaust temperature >

moisture content >

oxygen at the air preheater outlet >

main steam pressure. Other parameters have less influence on the uncertainty of the test results. According to the uncertainty evaluation results, to control the test quality, this paper proposes the principle of measuring points layout and instrument selection, and recommends the sampling methods of coal, fly ash and bottom ash. Key words: overall power plant performance test, ASME PTC46, heat rate, boiler, boiler efficiency, steam turbine, uncertainty analysis 全厂性能试验[1] 是用来评估火力发电厂整体热 力性能的综合性试验.全厂性能试验主要参考《电 厂整体性能试验规程》 (ASME PTC46) 进行. ASME PTC46 是将整个热力系统作为一个整体来确定其 热力性能,试验主要内容是测定机组净输出功率及 净热耗率,试验结果可以被厂方用来与设计值做对 比, 也可用来分析机组整体性能随时间变化趋势[1] . 用统计学的方法对试验结果的精确性和有效 性量化评价,称为试验结果的不确定度分析[2].不 确定度作为定量表达试验结果精确度的一种方法, 其值可综合反映测试水平、测试结果的质量和使用 价值.试验结果的不确定度不能用于修正试验结 第3期常经纬 等 燃煤机组全厂净热耗率不确定度分析