核准制下超超临界火电机组NOx排放特性的数值模拟
Numerical simulation of NOx emission characteristics of ultra-supercritical thermal power units under approval system
李俊 1敖琳瑛 1邓冰 1屈广林 2余廷芳2
作者信息
- 1. 江西省政府投资项目评审中心,江西 南昌 330036
- 2. 南昌大学先进制造学院,江西 南昌 330031
- 折叠
摘要
围绕新建火电项目核准制度,以某新建超超临界火电机组 1 000 MW四墙切圆燃煤锅炉为研究对象,运用FLUENT数值计算软件对其进行 1∶1 实体建模,选择对应的数学模型,采用数值模拟的方法对燃煤锅炉在不同过量空气系数、磨煤机组合方式以及锅炉负荷率下的NOx 生成特性规律进行了研究.结果表明:炉内过量空气系数在1.1～1.15 时可取得较低的NOx 排放及较高的燃烧效率.6 层燃烧器全部投运工况下,锅炉燃烧NOx 生成量较多,投运 5 层燃烧器时,磨煤机组合方式为ABCDE可取得最低的NOx 排放,组合方式为BCDEF时NOx 排放浓度最高.随负荷减小炉内温度下降,NOx 生成量减少,而气流组织和燃尽度较差.
Abstract
Focusing on the approval system for new thermal power projects,taking a new 1 000 MW four wall tangential coal-fired boiler of a certain ultra-supercritical thermal power unit as the research object,a 1∶1 solid modeling was conducted.Based on FLUENT numerical calculation software,a reasonable mathematical model was selected,and numerical simulation methods were used to study the effects of excess air coefficient,coal mill combination formula,and load changes on the NOx generation characteristics of the boiler.The results showed that when the excess air coefficient in the furnace was between 1.1 and 1.15,lower NOx emissions and higher combustion efficiency can be achieved.When all six layer burners were put into operation,the boiler generated a large amount of NOx during combustion.When the five layer burner was put into operation,the combination mode of the coal mill was ABCDE,which achieved the lowest NOx emission.When the combination mode was BCDEF,the NOx emission concentration was the highest.The decrease in load led to a decrease in the temperature level in the furnace and a reduction in NOx emissions,but the airflow organization and combustion degree were poor.
关键词
超超临界/NOx生成特性/燃煤锅炉/过量空气系数/数值模拟/核准制Key words
ultra-supercritical/NOx formation characteristics/coal-fired boilers/excess air coefficient/numerical simulation/approval system引用本文复制引用
出版年
2024
NETL
NSTL
万方数据