1000MW超超临界燃煤锅炉燃烧与NO_x排放特性试验研究

为实现高效燃烧和低NOx排放,在一台1000MW对冲燃烧烟煤锅炉上进行燃烧优化调整试验,测量炉膛烟气温度分布,研究煤种、省煤器出口氧量、燃尽风量、燃烧器及燃尽风风门开度、燃烧器投运方式和负荷等因素对燃烧和NOx排放的影响规律。试验表明,省煤器出口氧量和燃尽风量对锅炉效率和NOx排放有较大影响,二者分别保持在3.0%和750t/h时运行效果较好,且利于消除屏式过热器结焦;调整同层燃烧器外二次风挡板开度可减轻沿炉膛宽度的氧量不均;燃用设计煤种、全关燃尽风喷口外二次风挡板、保持燃烧器中心风母管风门开度为50%并在满负荷时尽量停止一层上排燃烧器利于降低飞灰中碳的质量分数。调整后测得锅炉效率超过94.4%,NOx排放浓度低于300mg/m3,明显优于国内目前运行的锅炉。

Experimental Study on Combustion and NO_x Emission Characteristic of 1 000 MW Ultra-supercritical Coal-fired Boiler

For getting higher efficiency and lower NOx emission,a test to optimize combustion system is conducted in a 1 000 MW bituminous coal-fired boiler in opposed firing pattern.During the test,the gas temperature distribution in furnace is measured,combustion and NOx emission characteristic is studied by varying such factors as type of coal,O2 at economizer exit,mass flow of over fired air(OFA),air damper position of burner and after air port(AAP),combinations of burners and boiler load.It indicates that O2 at e...