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针对某800MW超临界锅炉NOx排放量较高的问题,设计了配风方式不同的3种工况.利用CFD软件,对3种工况进行了炉内燃烧、传热及污染物排放等方面的数值计算,并分析了炉内的温度、NOx及CO组分的分布情况.结果表明:计算结果与实测数据吻合较好,空气分级燃烧使主燃区温度降低,CO体积分数升高,NOx质量浓度明显降低;燃尽风对燃料的燃尽率和炉膛出口烟温产生了不利影响,从而影响机组的经济性和安全性.通过对各个工况燃料的燃尽率及炉膛出口烟温进行综合比较分析,得出工况3为较理想的改造方案.
Aiming at the problem of high NOx emission in a 800MW supercritical boiler, three kinds of operating conditions with different ventilation modes were designed. The CFD software was used to carry out the combustion, heat transfer and pollutant discharge in three kinds of operating conditions The results show that the calculated results are in good agreement with the measured data, the temperature of the main combustion zone decreases, the CO volume fraction increases, and the NOx mass The concentration is obviously reduced.The burnout rate has an adverse effect on the burn-out rate of the fuel and the smoke temperature at the exit of the furnace, thus affecting the economy and safety of the unit.According to the burnout rate of each working condition fuel and the smoke temperature at the exit of the furnace A comparative analysis shows that condition 3 is the ideal reform plan.