摘要
针对1000MW超超临界锅炉水冷壁出现的较大汽温偏差进行了试验研究和水动力计算。在锅炉结构和燃烧方式的基础上建立了平顶山发电分公司锅炉的流动网络系统水动力计算数学模型,根据计算模型划分的流动回路在现场布置了相关试验测点。通过现场启炉试验、变磨煤机投运方式试验和中间混合集箱混合效果试验,结合水动力计算结果,探索各因素影响汽温偏差的规律。研究结果发现,升负荷速率和局部热负荷过大会造成较大汽温偏差,启炉过程中应控制升负荷速率不大于25MW/min;在4台磨投运试验工况中推荐BCEF组合方式,5台磨投运试验工况中推荐ABCEF组合方式;中间过渡段混合集箱50%BMCR负荷至100%BMCR负荷混合效果良好。在锅炉整体结构设计方面,需通过增大进入上炉膛前墙的流动截面积以改变前墙水动力适应性,降低其热敏感性。
The hydrodynamic calculation and experimental study were carried out for the water wall steam temperature deviation in the furnace of the 1000 MW ultra supercritical boiler. Based on the boiler structure and combustion mode, a network system mathematical model of a 1000 MW boiler was established. According to the flow loop, the relevant test points were arranged on site. The law of the various factors on the wall temperature deviation was explored through the field test of startup of boilers, the experiment on different working ways of coal pulverizers and the mixing effect test of mixed boxes, combined with the results of the hydrodynamic calculation. The results of the study indicates that the higher increased rate of boilers load and local heat load lead to large steam temperature deviation at outlet of furnace and the increased rate of boilers load should be not more than 25 MW/min during startup of boilers. Besides, through the experiment on different working ways of coal pulverizers, the pulverizers working ways of BCEF and ABCEF are recommended. It appears that the mixed boxes have a good mixing effect between 50% BMCR load and 100%BMCR load in the middle transition section. In terms of boiler structure design, in order to improve the hydrodynamic adaptability of the front wall of the upper furnace, the flow cross-sectional area of the front wall should be increased.
作者
聂鑫
杨冬
吕宏彪
张世宏
黄宏伟
员盼锋
杨培军
周科
NIE Xin;YANG Dong;Lü Hongbiao;ZHANG Shihong;HUANG Hongwei;YUN Panfeng;YANG Peijun;ZHOU Ke(State Key Laboratory of Multiphase Flow in Power Engineering(Xi’an Jiaotong University),Xi’an 710049,Shaanxi Province,China;Henan Electric Power Generation Limited Company,State Power Investment Corporation,Zhengzhou 450001,Henan Province,China;Xi'an Thermal Power Research Institute Co.,Ltd,Xi’an 710054,Shaanxi Provence,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2019年第3期744-753,953,共11页
Proceedings of the CSEE
基金
国家科技支撑计划项目(2015BAA03B01)
国家重点研发计划(2017YFB0902100)~~
关键词
1000MW
超超临界
锅炉水冷壁
汽温偏差
水动力
吸热偏差试验
磨煤机投运
质量流率
1000MW
ultra supercritical
boiler water wall
steam temperature deviation
hydrodynamic
endothermic deviation test
coal pulverize
mass flow rate
