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富氧燃烧会对煤粉和高炉煤气混烧锅炉炉内的燃烧特性产生重要影响。以130 t/h煤粉和高炉煤气混烧锅炉为研究对象,采用Fluent流体力学软件,对助燃气体(O_2/N_2)在3种不同氧气体积百分数(21%,23%,27%)工况下煤粉和高炉煤气混烧锅炉炉内的燃烧过程进行数值模拟。模拟得到3种工况下:炉内的温度场分布,烟气流场特性,火焰长度。模拟结果表明:随着氧气浓度的增加,燃料着火速度更快,燃烧更稳定,出口烟温逐渐降低,炉内烟气流速逐渐减少,强化了炉内传热效果,提高了锅炉热效率。
Oxygen-enriched combustion can have a significant impact on the combustion characteristics of pulverized coal and blast furnace gas-fired boilers. With 130 t / h pulverized coal and blast furnace gas fired boiler as the research object, Fluent fluid mechanics software was used to study the effect of combustion-supporting gas (O 2 / N 2) on three different oxygen volume percentages (21%, 23% and 27% Under the coal and blast furnace gas combustion boiler combustion process for numerical simulation. Three kinds of operating conditions were obtained: the temperature distribution in the furnace, the characteristics of the flue gas flow field and the length of the flame. The simulation results show that with the increase of oxygen concentration, the ignition speed of the fuel is faster, the combustion is more stable, the exit flue temperature is gradually reduced, and the flue gas velocity in the furnace is gradually reduced, which enhances the heat transfer effect in the furnace and improves the thermal efficiency of the boiler.