超超临界锅炉水冷壁节流孔板垢物沉积问题的数值研究  

Numerical study on deposition problem of orifices in waterwalls of ultra-supercritical boilers

作　　者：汤妍[1] 周克毅[1] 韦红旗[1] 徐啸虎[1] 黄军林[1] 

机构地区：[1]东南大学能源与环境学院,江苏南京210096

出　　处：《化工学报》2011年第7期1873-1878,共6页CIESC Journal

摘　　要：为了减小锅炉水冷壁热偏差，防止发生局部超温和爆管，超超临界锅炉常在水冷壁管人口段加装节流孔板来调节各水冷壁回路的流量，如图1所示。但是锅炉在投运一定时间后经常发生节流孔板结垢问题，造成水冷壁超温和爆管事故，严重影响安全运行。因此必须对孔板进行定期除垢，目前主要采用酸洗的方法[2]，但这种方法会对汽水循环中的其他设备造成一定程度的腐蚀和损害，影响其运行安全性和寿命。In order to solve the overheating and tube failure problems caused by deposits accumulated on the orifices in waterwalls of ultra-supercritical boilers,numerical models of a sample orifice are established based on the FLUENT platform after the analysis on the deposition mechanism.A detailed description of the flow field near the orifice is obtained with the help of the vector plots and the pressure contours.Trajectories and concentration distributions of particles injected from different sites are calculated and analyzed.The results indicate that precipitation and deposition of magnetite caused by the sharp pressure drop near the orifice surface is the main reason for the deposition problem.

关 键 词：超超临界 节流孔板 垢物沉积 磁性氧化铁 数值模拟 

分 类 号：TK224.9[动力工程及工程热物理—动力机械及工程]