摘要
火电超低排放背景下,锅炉主燃区贫氧运行成为常态,水冷壁壁面附近H_(2)S含量较高,导致严重的高温腐蚀。针对该问题,以某切圆燃烧锅炉为对象,测量水冷壁壁面附近不同高度处的H_(2)S体积分数,发现H_(2)S体积分数最高可达0.182%,常态运行时也在0.06%~0.10%。进一步分析发现,锅炉热态切圆直径沿炉膛竖直方向由下至上逐渐增大,是导致分离燃尽风层高度处水冷壁出现高温腐蚀的重要原因。最后,对H_(2)S含量与腐蚀速率进行关联分析,计算不同运行时间下水冷壁的腐蚀深度,计算结果在趋势上与该炉实际腐蚀情况一致。
Under the background of ultra-low emissions in thermal power plants,oxygen-lean operation in the main combustion zone of the boiler has become the norm,resulting in a high concentration of H_(2)S near the water wall and causing severe high-temperature corrosion.In response to this problem,this paper takes a tangentially fired boiler as an object to measure the H_(2)S concentrations near the water wall at different heights.It is found the peak volume fraction of H_(2)S can reach 0.182%,and in the normal operation mode,the fraction fluctuates from 0.06%to 0.10%.Further analysis indicates that along the height of the furnace,the diameter of the boiler tangent circle gradually becomes larger,which is an important reason for the high temperature corrosion of the water wall at the height of the SOFA wind layer.Finally,the correlation analysis of H_(2)S concentration and corrosion rate is carried out and the corrosion depth of the water wall under different operating hours is calculated.The calculation result is consistent with the actual corrosion degree of the furnace in trend.
作者
熊小鹤
吕钊敏
阮仁晖
陈发林
谭厚章
XIONG Xiaohe;L Zhaomin;RUAN Renhui;CHEN Falin;TAN Houzhang(MOE Key Laboratory of Thermo-fluid Science and Engineering,Xi’an Jiaotong University,Xi’an,Shaanxi 710049,China)
出处
《广东电力》
2022年第7期107-113,共7页
Guangdong Electric Power
基金
国家自然科学基金项目(22008192)。
关键词
水冷壁
高温腐蚀
H_(2)S
运行调整
water wall
high temperature corrosion
hydrogen sulfide
operation adjustment
