W型火焰锅炉燃烧优化调整试验研究

摘要

Through the optimization and adjustment testing on multiple coal type blending,air distribution mode,racemic rod position,operating oxygen,outlet temperature of the grinding coal mill,furnace flame temperature,and temperature distribution measurement,the W-flame boiler combustion status is studied under different working conditions.The study results show that the R90 of the anthracite-combustion units is substantially high,which is the major cause of the high carbon contents of the fly ash.After the air distribution is optimized and adjusted,the local CO contents at multiple points have been reduced from (3 000～5 000)×10-6 to less than 350×10-6 with the carbon contents of the fly ash lowered down and the boiler efficiency improved.The NOx emission is also controlled within the specified range.When the anthracite coal is burned,the grinding mill can be operated safely and stably at the outlet temperature of 118 ℃.Moreover,after the racemic rod is optimized and adjusted,the boiler efficiency can be distinctly improved while the superheater desuperheating water is reduced by more than 10 t/h.Meanwhile,the carbon contents of the fly ash are also reduced to some extents.%通过多煤种掺配、配风方式、消旋拉杆位置、运行氧量、磨煤机出口温度、炉膛火焰温度、温度分布等优化调整试验.研究了不同工况下W型火焰锅炉燃烧状况.研究结果表明:燃用无烟煤的机组R9o明显偏高.是导致飞灰中碳质量分数偏高的重要原因;配风优化调整后,多处局部的CO体积分数由(3 000～5 000)×l0-6降低至350×10-6以下,飞灰中碳质量分数降低,锅炉效率提高,NOx排放控制在规定范围内,燃用无烟煤时磨煤机出口温度可在1 18℃安全稳定运行;消旋拉杆优化调整后,锅炉效率提高,过热器减温水可降低10 t/h以上,飞灰中碳质量分数也有所下降.