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| 1 | 大型光亮退火马弗炉加热段温度场模拟显示文摘建立了大型光亮退火马弗炉加热段温度场的三维仿真模型.该模型考虑了马弗炉实际结构、带钢退火速度和升温曲线特点,采用等效热流密度表征马弗管内保护气体和带钢的换热;选择组分传输燃烧模型、离散坐标辐射模型和标准k-ε双方程湍流模型描述马弗炉内燃烧、换热和气体流动;应用SIMPLE计算方法进行求解.典型规格304不锈钢带光亮退火过程实测特征点温度值和模拟结果基本吻合.分析得到了马弗炉内温度场、流场和速度场分布规律.结果表明:马弗管温度比较均匀,喷嘴正对区域温度偏高;燃气气流沿马弗管壁螺旋流动实现均匀加热.喷吹量较小时,喷吹量(入口速度)越大,马弗炉内温度越高;喷吹量继续增大,马弗炉内温度反而开始降低. | 杨竞 武传标 孙朝阳 叶乃威 娄奇袭 | 2013 | 北京科技大学学报2013，35，5： | 4 |
| 2 | Modeling of Soot Formation in Gas Burner Using Reduced Chemical Kinetics Coupled with CFD Code显示文摘A computational study of soot formation in ethylene/air coflow jet diffusion flame at atmospheric pres-sure was conducted using a reduced mechanism and soot formation model. A 20-step mechanism was derived from the full mechanism using sensitivity analysis,reaction path analysis and quasi steady state(QSS) approximation. The model in premixed flame was validated and with computing savings in diffusion flame was applied by incor-porating into a CFD code. Simulations were performed to explore the effect of coflow air on flame structure and soot formation. Thermal radiation was calculated by a discrete-ordinates method,and soot formation was predicted by a simple two-equation soot model. Model results are in good agreement with those from experiment data and detailed mechanism at atmospheric conditions. The soot nucleation,growth,and oxidation by OH are all enhanced by decrease in coflow air velocity. The peak soot volume fraction region appears in the lower annular region be-tween the peak flame temperature and peak acetylene concentration locations,and the high soot oxidation rate due to the OH attack occurs in the middle annular region because of high temperature. | ZHANG Yindi ZHOU Huaichun XIE Mingliang FANG Qingyan WEI Yan | 2010 | Chinese Journal of Chemical Engineering2010，18，6： | 4 |
| 3 | A numerical study of accelerated moderate or intense low-oxygen dilution(MILD)combustion stability for methane in a lab-scale furnace by off-stoichiometric combustion technology显示文摘Moderate or intense lowoxygen dilution(MILD)combustion has become a promising lowNOX emission technology,while the delayed mixing of reactants and slower oxidation rate could potentially cause ignition instability in some scenarios.This paper proposes a new idea for enhancing the ignition stability for methane MILD combustion by combining with offstoichiometric combustion(OSC),and its performances have been numerically assessed through a comparison against the original MILD combustion burner.The results reveal although nonpremixed pattern has the lowest NO emission,it suffers from a larger liftoff distance,thus less ignition stability.Contrarily,both partiallypremixed and fully premixed patterns exhibit excellent ignition stability.Among the considered OSC conditions,the pattern of Inner ultrarich and Outer lean produces the lowest NO emission while maintains a high ignition stability.Furthermore,the enhancement of the combustion stability by implementing OSC to the original MILD combustion burner is shown by comparing the operational range of furnace wall temperature(Tf),CO and NO emissions,as well as the evolution of chemical flame.The comparison reveals that OSC can extend the lowest operational Tf from 900 K to 800 K.More importantly,OSC can significantly improve the ignition stability in the whole range of Tf as compared to the original MILD combustion burner. | Mengqian Xie Fangqin Dai Yaojie Tu | 2021 | Chinese Journal of Chemical Engineering2021，34，4： | 1 |
| 4 | 炉膛容积对氧煤燃烧方式的影响显示文摘基于已建立的一维辐射传热计算模型,引入温度波动系数,进一步讨论了不同炉膛容积对介质温度分布、氧煤燃烧模式转化的影响。结果表明:在MILD燃烧模式下,空间温度波动范围可缩小至±5%左右,温度波动系数随着氧浓度的降低逐渐减小,在低氧浓度(<10%)下,温度分布逐渐趋于均匀;随着炉膛容积的增大,炉膛截面热负荷和容积热负荷减小,介质温度随之降低,且使得炉膛介质温度会在相对较高的氧浓度下趋于均匀化,更易实现MILD燃烧模式。 | 刘若晨 安恩科 | 2017 | 锅炉技术2017，48，2： | 0 |
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