摘要
对甲烷在氧—汽燃烧过程中碳烟生成状况进行了数值模拟研究。通过对比O_(2)/N_(2)和O_(2)/H_(2)O氛围下四种工况(21%O_(2)、30%O_(2)、40%O_(2)、50%O_(2))的火焰形态和碳烟体积分数,发现相同O_(2)浓度下,前者火焰温度、火焰高度、碳烟体积分数均低于后者,表明H_(2)O能够明显抑制碳烟生成。通过对比O_(2)/N_(2)、O_(2)/H_(2)O和O_(2)/FH_(2)O氛围下四种工况的最大碳烟体积分数和最大颗粒数量密度,表明不仅H_(2)O的化学效应抑制碳烟生成,而且其他三大效应也共同抑制碳烟生成。通过进一步分析化学效应随H_(2)O浓度的变化规律,确定了H_(2)O浓度为60%时,化学效应的抑制效果最佳。
The soot formation of methane in oxygen steam combustion was numerically simulated.By comparing the flame morphology and soot volume fraction of four working conditions(21%O_(2),30%O_(2),40%O_(2)and 50%O_(2))under O_(2)/N_(2)and O_(2)/H_(2)O atmospheres,it is found that the flame temperature,flame height and soot volume fraction of the former are lower than those of the latter under the same O_(2)concentration,indicating that H_(2)O can significantly inhibit soot formation.By comparing the maximum soot volume fraction and maximum particle number density under four working conditions of O_(2)/N_(2),O_(2)/H_(2)O and O_(2)/FH_(2)O,it is shown that not only the chemical effect of H_(2)O inhibits soot formation,but also the other three effects jointly inhibit soot generation.The variation of chemical effect with H_(2)O concentration is further analyzed,and it is determined that the inhibition effect of chemical effect is the best when the concentration of H_(2)O is 60%.
作者
胡多多
HU Duoduo(Emergency Maintenance Center of Eastern Crude Oil Storage and Transportation Co.Ltd.of National Pipeline Network Group,Xuzhou 221008,Jiangsu,China)
出处
《工业锅炉》
2021年第4期9-14,20,共7页
Industrial Boilers
