摘要
为研究锅炉水冷壁的动态特性,将水冷壁划分为多个模块,区分了沿高度方向与沿周向的热负荷不均匀情况,建立了660 MW超临界锅炉水冷壁区域的动态仿真模型。研究了水冷壁不同墙在热负荷变化下的壁温分布,对比了不同边界条件阶跃下水冷壁的响应特性,考察了变负荷过程中水冷壁的水动力与壁温特性。结果表明:后墙热负荷变化只会影响后墙水冷壁与凝渣管处的壁温;当后墙热负荷上升到锅炉最大出力的1.5倍时,凝渣管出现超温现象;当热负荷、入口质量流量与入口工质温度分别阶跃降低10%时,汽水分离器处出口汽温分别变化-7.97 K、+11.57 K和-19.97 K,即入口工质温度变化对汽温的影响最大;升负荷过程中汽温先上升后下降,降负荷过程中汽温先下降后上升。
In order to study the dynamic characteristics of boiler water-cooled wall,the water-cooled wall was divided into different modules,and the thermal deviation in height direction and circumferential direction was considered.The dynamic simulation model of the water-cooled wall of a 660 MW supercritical boiler was established.The wall temperature distribution of different walls in the water-cooled wall under the change of heat load was studied.When the different boundary conditions underwent step change,the response characteristics of the water-cooled wall were compared.The hydrodynamic and wall-temperature characteristics of the boiler water-cooled wall under load-variation conditions were studied.Results show that the change of the heat load of the rear wall only affects the wall temperature of the rear water-cooled wall and the slag tube.When the heat load of the rear wall rises to 1.5 times of the boiler maximum continuous rating(BMCR),the overtemperature phenomenon occurs at the slag tube.When the heat load,inlet feedwater flow rate and temperature undergo step change by -10%,the steam temperature at the separator outlet is changed by -7.97 K,+11.57 K and -19.97 K,respectively.The change of inlet feedwater temperature has the greatest influence on the steam temperature.Under the load lifting condition,the steam temperature first rises and then decreases.Under the load decreasing condition,the steam temperature first decreases and then rises.
作者
王超
王研凯
陈相如
孙兴业
刘铠瑞
王利民
车得福
WANG Chao;WANG Yankai;CHEN Xiangru;SUN Xingye;LIU Kairui;WANG Limin;CHE Defu(Inner Mongolia Power(GROUP)Co.,Ltd.,Hohhot 010020,China;State Key Laboratory of Multiphase Flow in Power Engineering,Xi'an Jiaotong University,Xi'an 710049,China)
出处
《动力工程学报》
CAS
CSCD
北大核心
2024年第7期1001-1009,共9页
Journal of Chinese Society of Power Engineering
基金
内蒙古电力科学研究院科技资助项目(ZC-2021-01)。
关键词
超临界锅炉
动态特性
变负荷
水动力
壁温
supercritical boiler
dynamic characteristics
load-variation
hydrodynamics
wall temperature
