省煤器给水旁路提升SCR进口烟温应用研究

针对某300 MW燃煤电站锅炉在中低负荷运行时SCR脱硝系统进口烟温低无法投运的问题,采用省煤器给水旁路技术改造以提升SCR进口烟温。通过典型负荷下的旁路试验,验证了给水旁路技术对锅炉烟温的提升性能,同时考察了对锅炉运行的影响。针对给水旁路技术存在因给水饱和气化而威胁锅炉安全的潜在问题,建立了旁路安全流量在线计算模型,得到旁路运行中的实时安全流量,为给水旁路技术的安全应用提供指导。相关研究为电站锅炉实现SCR脱硝宽负荷投运提供了有价值的参考。

Study on Application of Economizer Feedwater Bypass to Increase the Flue Gas Temperature

Aiming at the problem of unusable SCR denitrification system due to the low inlet flue gas temperature during the medium and low load operations of a 300 MW coal-fired boiler, an economizer feedwater bypass technology is applied to raise the SCR inlet flue gas temperature. Based on the bypass tests at typical loadings, the effect of the economizer feedwater bypass on the enhancement of the flue gas temperature is validated and the influence on the boiler operation is studied. Besides, considering the potential risks of the evaporation of the saturated feedwater on boiler safety, a real-time bypass safety flow-rate computing model is established. Therefore, the real-time safety flow-rate is obtained, which can guide the application of the bypass technology. The study results can provide valuable reference for the wide-load denitrification of power plants.