摘要
超临界大容量、高参数锅炉是我国燃煤发电的重要发展趋势,主流的超临界锅炉大多采用螺旋-垂直型水冷壁,但其水动力特性及流量分配引起的运行事故常有发生。针对某典型的螺旋-垂直型水冷壁,根据水动力流动网络系统,结合质量和动量守恒进行水动力建模计算。根据锅炉水冷壁结构划分了流量回路,设置了压力节点,分段进行了阻力系数和流量计算,螺旋管中阻力系数越大,流量越小;而垂直水冷壁中阻力系数最大的管路(81~90回路)流量最少,阻力最小值在50~55号回路,但是后墙的流量较多,导致流量最大值在第71号回路。对于流量最小的水冷壁管路,容易造成超温爆管等问题,可适当增加管径,在安装过程中避免较大的焊瘤,从而保证锅炉运行安全。
Supercritical boilers with large capacity and high parameters are the development trend in coal-fired power generation in China.Most mainstream supercritical boilers use spiral-vertical water walls,but hydrodynamic characteristics and flow distribution often causes operational problems.A typical spiral vertical water wall is modeled and calculated based on the hydrodynamic flow network system,combining mass and momentum conservation.According to the structure of the boiler water wall,the flow circuit is divided,pressure nodes are set,and the resistance coefficient and flow rate are calculated in sections.The larger the resistance coefficient in the spiral tube,the smaller the flow rate;The pipeline with the largest resistance coefficient in the vertical water wall(81~90 circuit)has the lowest flow rate.However,in view of a large flow rate in the back wall,the maximum flow rate is in the 71 circuit rather than in the 50~55 circuit with the minimum resistance.For water wall pipelines with the smallest flow rate,it is easy to cause overheating problems.A larger pipe diameter and small weld beading are important to ensure the safe operation of the boiler.
作者
赵天
张贺
朱万进
王传栋
杨振
ZHAO Tian;ZHANG He;ZHU Wanjin;WANG Chuandong;YANG Zhen(Guoneng Xuzhou Power Generation Limited Company,Xuzhou 221135,China;Jiangsu Fangtian Power Technology Limited Company,Nanjing 211102,China)
出处
《工业加热》
CAS
2024年第7期45-49,54,共6页
Industrial Heating
基金
国家能源集团江苏省电力有限公司科技项目(JSKJ-23022-20)。
关键词
超临界锅炉
水动力计算
螺旋水冷壁
垂直水冷壁
supercritical boiler
hydrodynamic calculation
spiral water cooled wall
vertical water wall
