不同炼厂干气燃烧和污染物排放的数值模拟  

Numerical Simulation of Off-Gas Combustion and Pollutant Emissions of Different Refinery

作　　者：孙全胜[1] 刘波[2] 徐宏[2] 王元华[2] 

机构地区：[1]中国石化股份公司天津分公司装备研究院,天津300270 [2]华东理工大学化学工程联合国家重点实验室,上海200237

出　　处：《工业炉》2015年第1期44-47,64,共5页Industrial Furnace

基　　金：中国石油化工股份有限公司资助项目(312016)

摘　　要：分析了天然气和3种不同炼厂干气燃烧和污染物生成特性。采用修正k-ε湍流模型、DO离散坐标辐射模型、PDF混合分数概率密度燃烧模型的模拟值与实验值吻合良好。结果表明,燃气和空气的混合过程控制着射流扩散火焰燃烧反应,因而天然气及炼厂干气的温度分布一致;燃气碳氢比影响燃烧CO摩尔分数值,天然气的碳氢比为0.25,小于炼厂干气的0.29,因而天然气火焰的CO摩尔分数值小于炼厂干气;燃气中的N2含量影响NO的生成量,4种燃气火焰的NO摩尔分数ROG-2>ROG-3>ROG-1>NG,与燃气中N2含量的变化趋势一致。Natural gas（NG）and three different refinery off-gas（ROG）combustion and pollutant emissions characteristics were analyzed. The simulation values, which were got by the modified k-6 model, DO discrete coordinate radiation model and PDF mixing f/action probability density combustion model, agreed well with experimental data. The results showed that the flame temperature of NG and ROG were similar, because the jet diffusion combustion process was influenced by the mixing of fuel gas and air. The C/H ratio had an influence on the CO mole fraction during combustion, so the CO mole fraction of NG with the C/H ratio 0.25 was less than the ROG with C/H ratio 0.29. The fuel gas N2 content was a major factor influencing the NO production in flame, so the trend of NO mole fraction and fuel gas N2 content was ROG-2〉ROG-3〉ROG-1〉 NG.

关 键 词：炼厂干气燃烧 数值模拟 天然气燃烧 一氧化氮 

分 类 号：TE626.9[石油与天然气工程—油气加工工程]