文献类型：期刊文献

中文题名：多喷嘴对置式粉煤气化炉的数值模拟

英文题名：Numerical simulation of opposed multi-burner entrained-flow coal gasifier

作者：李秋华[1];曹月丛[1];夏梓洪[1];陈彩霞[1];高晋生[1]

机构：[1]华东理工大学煤气化及能源化工教育部重点实验室,上海200237

年份：2012

卷号：40

期号：7

起止页码：74

中文期刊名：化学工程

外文期刊名：Chemical Engineering(China)

收录：CSTPCD;;Scopus;北大核心:【北大核心2011】；CSCD:【CSCD2011_2012】；

基金：国家自然科学基金资助项目(20876049)

语种：中文

中文关键词：四喷嘴对置式粉煤气化炉;数值模拟;MSPV;PDF

外文关键词：opposed tetra-burner entrained-flow coal gasifier; numerical simulation; MSPV; PDF

摘要：采用k-ε湍流模型对多喷嘴对置式粉煤气化中试装置进行了三维数值模拟研究。引入了多反应进程变量MSPV方法分别模拟了煤的脱挥发分、焦炭与氧气、焦炭与二氧化碳和焦炭与水蒸气的4个过程;用截断高斯分布的PDF函数表示湍流对化学反应的影响。模拟结果显示:常压下,火焰主体温度约2 500 K;除喷嘴区域外,煤中释放的气体在气化炉内分布均匀;焦炭与二氧化碳、焦炭与水蒸气的气化反应主要集中在折返流区。喷嘴高度上移0.2 m,撞击流股速度增加约50%,拱顶附近温度上升108 K。氧煤比/水蒸气煤比增大,撞击流对炉顶的冲刷力显著增加。
A pilot-scale opposed muhi-bumer （OMB） entrained-flow coal gasifier was simulated by using the standard k-ε turbulence model. A multi-solid progress variables （MSPV） approach was employed in the modeling of coal devolatilization, char-O2, char-CO2, and char-H2O reactions. The probability density function （PDF） model with a clipped Gaussian distribution function was used to express the effect of turbulence on the reaction. The results show that the peak gas temperature is about 2 500 K at normal pressure. The distributions of four mixture fractions in the gasifier are uniform except that on the nozzle zone. The gasification reactions of char-CO2, and char-H2O mainly occur in the recycle zone above the nozzle plane. The upward impinging flow velocity increases by 50% and the gas temperature of arch area increases by 108 K with a rise of 0.2 m for the nozzle height. The intensity of impinging stream toward the arch increases significantly with the increase of O2-char and H2O-char ratio.