330MW四角切圆锅炉宽负荷下水冷壁安全性研究  

Study on Water-cooled Wall Safety of a 330MW Tangentially Fired Boiler under Wide Load Range

作　　者：郅刚 李建岭 杜勇 张乐 尹永维 徐光平 王勇 韩磊 ZHI Gang;LI Jianling;DU Yong;ZHANG Le;YIN Yongwei;XU Guangping;WANG Yong;HAN Lei(Guoneng Yuci Thermal Power Co.Ltd.,Jinzhong 030600,China;Beijing Zhonganjitai Technology Co.Ltd.,Beijing 100080,China;State Key Laboratory of Multiphase Flow in Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]国能榆次热电有限公司,山西晋中030600 [2]北京中安吉泰科技有限公司,北京100080 [3]西安交通大学动力工程多相流国家重点实验室,陕西西安710049

出　　处：《工业加热》2025年第3期29-34,共6页Industrial Heating

基　　金：国家重点研发计划项目(2017YFB0602100)。

摘　　要：“双碳”背景下,火电机组需要变负荷参与电网调峰,这为锅炉的水冷壁安全性带来了挑战。以某亚临界机组330 MW四角切圆锅炉为对象,采用数值模拟与水动力计算相耦合的方法,获得了100%BMCR(锅炉最大连续出力)、75%THA(汽轮机热耗率验收)、50%THA和30%BMCR负荷下水冷壁热流密度和磨损速率的分布,并对管壁温度分布和管内流动停滞现象进行了研究。结果表明:主燃区壁面吸热量随着负荷的降低而减小,在30%BMCR负荷下,主燃区仅有一半的壁面吸热量能达到1.3×10^(5)W/m^(2)以上;燃烧器喷口附近的磨损在各负荷下均较为严重,磨损速率可达6×10^(-8)~1×10^(-7)kg/(m^(2)·s);前墙管组的外壁面整体温度水平随着负荷的降低而降低,最大温差出现在75%THA负荷下,为39.3 K;30%BMCR负荷下,前墙第1列、第9列和第10列管组的压差比小于1.05,在实际运行过程中存在流动停滞风险。With the introduction of"dual carbon"traget,the thermal power units need to participate more in the peak-shaving process,which brings challenges to the safety of the water-cooled wall.In this study,the distribution of the heat flux and the wear rate under the 100%BMCR(boiler maximum continuous rating),75%THA(turbine heat acceptance),50%THA,and 30%BMCR loads are obtained by using the coupled method of the numerical simulation and hydrodynamic calculation for a subcritical 330 MW tangentially fired boiler.The mean wall temperatures and the flow stagnation are also investigated.The results show that the wall heat absorption in the main combustion zone decreases with the reduction of load.Only half of the tube sections could have a heat absorption more than 1.3×10^(5)W/m^(2)under 30%BMCR load.The wear near the burner nozzles is more serious under variable loads,with a wear rate of 6×10^(-8)~1×10^(-7)kg/(m^(2)·s).For the average temperature of the front wall,the overall temperature level decreases with a decreasing load.The maximum temperature dfference is 39.3 K,occurring at the 75%THA load.At the 30%BMCR load,the first,ninth and tenth columns of the tube sections have a ratio of the pressure difference less than 1.05,which might lead to a risk of the flow stagnation in the operation process.

关 键 词：燃烧模拟 磨损速率 水动力计算 

分 类 号：TK229.6[动力工程及工程热物理—动力机械及工程] TK16