超临界600 MW对冲燃烧锅炉主汽温偏差大原因及对策

Reasons and countermeasures of main steam temperature deviation on 600 MW supercritical opposed firing boiler

以超临界600 MW对冲燃烧锅炉为研究对象,对其主汽温、水冷壁温、氧量等运行参数进行分析,对氧量和汽温偏差的关联性进行计算,表明汽温偏差与炉内燃烧密切相关。在此基础上进行了制粉系统相关测试试验,结果表明同一台磨不同粉管的煤粉浓度存在较大偏差,造成6台磨运行时,A、B侧粉量偏差可达10.41%;中低负荷下4台主力磨运行时,偏差可达16.84%,这是造成汽温偏差的主要原因。

600 MW supercritical opposed firing boiler was explored by analyzing the operating parameters of main temperature,water wall temperature and oxygen volume.Meanwhile,oxygen and steam temperature deviations were investigated to obtain correlations,indicating that steam temperature deviations were be bound up with combustion in the furnace.In addition,milling system tests were also performed.The results reveals there are large deviation of coal concentration in the different pulverized pipes of the same mill,resulting in the deviation of the pulverized coal quantity on the A and B sides of the 6 mills reaching 10.41%.When the four main mills are running under medium and low load,the deviation can reach 16.84%,that is the main reason of steam temperature deviation.