A numerical simulation study on the combustion process of a 660 MW boiler under low load in a power plant was implemented,including comparing combustion characteristics of the boiler under 30%BMCR load and 100%BMCR load and analyzing the influence of low load on the combustion process.The results show that,under low load conditions,the furnace can maintain good flow-field fullness,both flow field and temperature field distribution become uniform and the combustion structure is reasonable to ensure both ignition and combustion of pulverized coal particles.Under 30%BMCR load,as compared to 100%BMCR load,the longitudinal section's average temperature at the boiler center can be reduced by 35.88%and the temperature gap in the burnout zone becomes larger;the low load condition can weaken the influence of the flame sticking to the wall on the heat load of the furnace,and improve the distribution of the heating load on the wall,as well as make the pulverized coal more easy to ignite and burn more fully.
关键词
超超临界锅炉/深度调峰/燃烧特性/低负荷稳燃/数值模拟
Key words
ultra-supercritical boiler/depth peak regulation/combustion characteristics/stable combustion at low load/numerical simulation
万方数据