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以某电厂1000MW超超临界双切圆燃烧锅炉为研究对象,采用现场燃烧调整试验方法,进行了氧量、负荷、燃尽风量、主燃烧区燃烧器风量和配风方式、磨煤机运行组合方式、燃烧器摆角、煤质等因素对锅炉NOx排放影响的试验研究。试验研究结果表明:对于具有先进低NOx燃烧系统的锅炉,煤质因素是NOx排放浓度的主要影响因素之一;运行氧量变化是NOx排放浓度的重要影响因素,随着氧量增加,锅炉NOx排放浓度呈线性增加;负荷也是NOx排放浓度的主要影响因素,其影响的程度取决于负荷和相应的运行氧量水平;而在保持大量燃尽风实现空气分级燃烧的条件下,主燃烧区燃烧器风量和配风方式对NOx排放浓度的影响是微弱的。在此基础上,应用多元线性回归方法,建立了该1000MW锅炉NOx排放浓度与主要运行因素的回归经验关系式,该经验关系式可用于该锅炉NOx排放浓度的在线运行控制和预测。
Taking a 1000MW ultra-supercritical dual-baint circular combustion boiler of a power plant as the research object, the on-site combustion adjustment test method was adopted to conduct experiments on oxygen quantity, load, air volume, burner air volume and gas distribution in the main combustion zone, Experimental Study on the Influences of Factors, Mode, Burner Swing Angle and Coal Quality on NOx Emissions of Boilers. Experimental results show that for coal-fired boilers with advanced low-NOx combustion system, the coal quality factor is one of the main factors affecting the NOx emission concentration. The change of operating oxygen level is an important factor affecting the NOx emission concentration. As the oxygen content increases, the boiler NOx The emission concentration increases linearly. The load is also the main influencing factor of NOx emission concentration, and the degree of influence depends on the load and the corresponding operating oxygen level. Under the condition of maintaining a large amount of burnt air to achieve air staged combustion, the main combustion zone burns The influence of air volume and air distribution on NOx emission concentration is weak. Based on this, the regression empirical relationship between the NOx emission concentration and the main operating factors of the 1000MW boiler is established by using the multiple linear regression method. The empirical relation can be used for online operation control and prediction of the NOx emission concentration of the boiler.