School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, P.R. China.
Environ Sci Technol. 2010 May 15;44(10):3926-31. doi: 10.1021/es1002378.
A new technique combining high boiler efficiency and low-NO(x) emissions was employed in a 300MWe down-fired boiler as an economical means to reduce NO(x) emissions in down-fired boilers burning low-volatile coals. Experiments were conducted on this boiler after the retrofit with measurements taken of gas temperature distributions along the primary air and coal mixture flows and in the furnace, furnace temperatures along the main axis and gas concentrations such as O(2), CO and NO(x) in the near-wall region. Data were compared with those obtained before the retrofit and verified that by applying the combined technique, gas temperature distributions in the furnace become more reasonable. Peak temperatures were lowered from the upper furnace to the lower furnace and flame stability was improved. Despite burning low-volatile coals, NO(x) emissions can be lowered by as much as 50% without increasing the levels of unburnt carbon in fly ash and reducing boiler thermal efficiency.
采用一种将高效率煤粉锅炉和低氮氧化物排放相结合的新技术，为经济地降低燃用低挥发分煤的煤粉锅炉的氮氧化物排放，在一台 300MW 下倾式煤粉锅炉上进行了改造。对改造后的锅炉进行了试验，测量了一次风和煤粉混合物流以及炉膛沿程的烟气温度分布、炉膛沿主轴线的温度以及近壁区的氧气、一氧化碳和氮氧化物等气体浓度。将这些数据与改造前的数据进行了比较，验证了通过应用这种组合技术，炉膛内的烟气温度分布变得更加合理。炉膛上部的峰值温度降低到下部，火焰稳定性得到改善。即使燃用低挥发分煤，氮氧化物的排放量也可以降低 50%，而飞灰中未燃碳的含量不会增加，锅炉热效率也不会降低。
