数值模拟计算在1000MW塔式锅炉NO_x生成特性中的应用研究

在新建的大型燃煤电站锅炉设计时,通过对炉内燃烧过程的合理组织,以取得锅炉低NO_X排放的效果.采用计算流体力学(CFD)模拟的方法,进行了某电厂1000MW超超临界塔式锅炉的数值模拟计算分析,获得了该1000MW塔式锅炉炉内速度场、温度场、CO浓度场、O-2浓度场和NO_X浓度场分布.计算结果表明:该1000MW塔式锅炉炉膛主燃烧区域的中心形成了巨大还原区,并且在炉膛上部具有明显的还原区域,能实现低NO_X排放的预期目标.数值模拟计算研究结论可用于指导锅炉燃烧系统的优化运行和NO_X排放的控制.

Numerical Simulation Study on the Characteristics of NO_x Formation in a 1000 MW Ultra-supercritical Utility Tower Boiler

In newly built large-scale coal-fired power plants,the boilers are all designed to achieve low NOx formation and emission,by which the in-furnace combustion process is reasonably organized.Computation and analysis of a 1000 MW Ultra-supercritical tower boiler equipped with advanced low NOx combustion system in a power plant were carried out by computational fluid dynamics(CFD) simulation approach.Through analysis on the obtained in-furnace fields of temperature and CO,O_2 and NOx concentrations,it was demonstrated that the combustion mode of the furnace main combustion zone was reducing combustion,therefore achieved the goal of low NOx emission of the boiler.This numeric simulation result can be used to optimize the boiler furnace combustion system and to control the NOx pollution.