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...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。展开更多
The dynamic sulfur emission from combustion of blends of coal liquefaction residue(CLR) and biomass (sawdust, MX and leaves, SY) was studied in a tubular furnace. The results show that the curves of sulfur release in ...The dynamic sulfur emission from combustion of blends of coal liquefaction residue(CLR) and biomass (sawdust, MX and leaves, SY) was studied in a tubular furnace. The results show that the curves of sulfur release in combustion of CLR or the blends gently increase with temperature, and the curves of sulfur release rate have two-peaks. Two sulfur release peaks are generated from different organic and inorganic sulfur forms in CLR and biomass. For the blends, the sulfur release is mainly determined by the high sulfur content of blends, which is CLR. With the decrease of CLR ratio, the amount of sulfur release and two maximum values of sulfur release rate derived from blends combustion all decrease, while the times for occurrence of the two characteristic peaks are both postponed.展开更多
文摘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。
文摘The dynamic sulfur emission from combustion of blends of coal liquefaction residue(CLR) and biomass (sawdust, MX and leaves, SY) was studied in a tubular furnace. The results show that the curves of sulfur release in combustion of CLR or the blends gently increase with temperature, and the curves of sulfur release rate have two-peaks. Two sulfur release peaks are generated from different organic and inorganic sulfur forms in CLR and biomass. For the blends, the sulfur release is mainly determined by the high sulfur content of blends, which is CLR. With the decrease of CLR ratio, the amount of sulfur release and two maximum values of sulfur release rate derived from blends combustion all decrease, while the times for occurrence of the two characteristic peaks are both postponed.
