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混煤燃烧存在复杂的相互影响,将混煤当成单一煤种并采用单混合分数/概率密度函数(probability density function,PDF)方法计算,意味着忽略了煤种之间的影响,结果会产生很大偏差。而双混合分数/PDF方法可以分别定义各单煤性质并跟踪各单煤的燃烧过程,能够体现煤种之间燃烧特性的影响。利用单、双混合分数/PDF方法对同1台300 MW四角切圆锅炉进行模拟研究,并与实测数据进行对比,结果表明:双混合分数/PDF方法模拟的结果更符合混煤在炉内实际的燃烧情况。同时采用双混合分数/PDF方法模拟某一混煤燃烧过程,得到燃烧煤粉锅炉的流动,温度和烟气分布等特性。
Mixed coal combustion has a complex interaction with coal as a single coal and is calculated using the single mixed fraction / probability density function (PDF) method, which implies neglecting the effects of coal and results in very Big deviation. The double mixed fraction / PDF method can define the properties of each single coal and track the combustion process of each single coal, which can reflect the influence of combustion characteristics between coal types. The single and double mixed fractions / PDF method were used to simulate the same tangential boiler with 300 MW. The results were compared with the measured data. The results show that the results of double mixed fractions / PDF method are more in line with the actual The burning situation. At the same time, the mixed-fraction / PDF method was used to simulate the combustion process of a certain mixed coal and the characteristics of the flow, temperature and flue gas distribution of the pulverized coal-fired boiler were obtained.