四角切圆锅炉高温腐蚀区域研究

Study on high temperature corrosion zone of Tangential round boiler

为了分析四角切圆锅炉容易发生高温腐蚀的区域,以某工程锅炉为例,进行了数值模拟计算。结果表明,影响水冷壁高温腐蚀的因素主要有两个,一个是炉内的还原性气氛,另一个是炉膛的局部高温区。如果炉内燃烧配风不足,导致水冷壁附近形成还原性气氛且处于高温区,水冷壁处将发生腐蚀。在高度上,高温腐蚀主要发生在燃尽风到中间集箱的位置,在水平方向上,高温腐蚀主要发生在角切后半程,因为此区域冲刷严重。这与现场运行情况相吻合。

In order to analyze the high temperature corrosion prone area of a tangential round boiler,numerical simulation is carried out with an engineering boiler as an example.The results show that there are two main factors affecting the corrosion of water wall,one is the reducing atmosphere in the furnace,and the other is the local high temperature area of the furnace.If the combustion air distribution in the furnace is insufficient,a reducing atmosphere will be formed near the water wall and it will be in a high temperature area,and corrosion will occur at the water wall.In height,high temperature corrosion mainly occurs at the position where the burnt-out wind reaches the middle header,and in horizontal direction,high temperature corrosion mainly occurs in the second half of corner cutting,because this area is seriously scoured.This is consistent with the field operation.