燃用非设计煤种的旋流对冲锅炉降低结焦危害的理论分析与实践

多种非设计煤的混烧是造成燃煤锅炉系统运行不稳定的重要原因。针对旋流对冲燃煤锅炉的燃烧系统为适应非设计煤种混烧的问题开展研究,以一台660 MW燃煤锅炉提高系统稳定性为对象,首先采用理论分析与数值模拟手段研究原有燃烧系统在燃用多煤种条件下所出现的问题,并提出了改进措施。所采用的强化一次风与内二次风混合的解决方案在实际锅炉燃烧系统改造中进行了实施,并获得较好的运行效果,为该类型燃烧器的稳定、经济、低NOx排放运行提供了有效的解决方案。

Theoretical and In-situ Experimental Investigation on Reducing Slagging Damage for Swirl-opposed Fired PC Boiler with Non-designed Blending Coals

The blending coals combustion with non-designed coals is an important issue for the boiler safe operation.In order to improve the operation characteristics of a 660MW boiler with swirl burners to adapt to the coal frequent changing,the investigation was conducted theoretically and in-situ experimentally.The coal combustion and slagging processes for the original designed swirl burner had been analysis numerically.The main reasons affecting the safe operation were obtained,which resolution methods then were proposed based on the theoretical analysis.In the actual technical transformation of the boiler burned with lower coal volatile content than the boiler designed,enhancing the mixture of inner secondary air to primary air had been carried out,which improved obviously the boiler performance with stability and economy.