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以锅炉过热器、再热器热偏差计算方法为基础,采用全局寻优方法,根据当前的负荷、磨煤机组合、燃烧器摆角、各层配风方式、末级过热器和再热器热偏差状况,对运行状况进行优化评判,从而降低管壁温度峰值,控制管壁超温幅度和超温时间,进而减缓氧化皮的生成速度,使锅炉运行的安全性和经济性得到双重保证.通过在某600 MW超临界锅炉上的在线优化运行,表明锅炉末级过热器屏间热偏差系数最大约为1.2,比以往的最大热偏差系数下降了10%.
Based on the calculation method of boiler superheater and reheater thermal deviation, the global optimum method was used. Based on the current load, coal mill combination, combustor swing angle, air distribution pattern of each floor, final superheater and reheater Thermal deviation conditions, the operating conditions to optimize the judge, thereby reducing the peak wall temperature, wall temperature control and over-temperature control time, thereby slowing the formation of scale, the boiler operation of the safety and economy are double guarantees. Through the on-line optimization operation of a 600 MW supercritical boiler, it shows that the maximum thermal deviation coefficient of the final stage superheater of the boiler is about 1.2, which is 10% lower than the maximum thermal deviation coefficient in the past.