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对某电厂1 000MW超超临界塔式锅炉进行了燃烧优化调整试验,分析了省煤器出口O2体积分数、机组负荷、二次风配风方式、紧凑燃尽风(CCOFA)风量、分离燃尽风(SOFA)风量及磨煤机组合方式等因素对锅炉燃烧及NOx排放特性的影响.结果表明:省煤器出口O2体积分数和机组负荷对锅炉热效率和NOx排放质量浓度有较大的影响;随着省煤器出口O2体积分数的增加,NOx排放质量浓度显著上升;随着机组负荷的降低,NOx排放质量浓度先降低后升高,锅炉热效率则先升高后降低;通过设置合理的二次风配风方式、CCOFA和SOFA风量比例以及磨煤机组合方式,既可以提高锅炉热效率又可以降低NOx排放质量浓度.
The combustion optimization of 1 000 MW ultra-supercritical boiler was carried out in a power plant. The effects of O2 volume fraction, unit load, secondary air distribution mode, CCOFA air volume, (SOFA) air volume and pulverizer combination on boiler combustion and NOx emission characteristics.The results show that O2 volume fraction and unit load at economizer outlet have a great impact on boiler thermal efficiency and NOx emission concentration. With the increase of O2 volume fraction at economizer outlet, the mass concentration of NOx emission increased significantly. With the decrease of unit load, the mass concentration of NOx emission first decreased and then increased, while the boiler thermal efficiency firstly increased and then decreased. Air distribution with the wind, CCOFA and the proportion of air flow and SOFA coal mill combination, both to improve boiler thermal efficiency can reduce the concentration of NOx emissions.