基于低氮燃烧技术的循环流化床锅炉改造

Application of low nitrogen combustion technologyin circulating fluidized bed boiler

现有循环流化床锅炉二次风无法穿透物料、炉内温差不均匀等问题,导致其燃烧效率低且烟气排放不达标。运用二次风系统设计、炉内温差调整、烟气再循环系统以及返料着床改造等低氮燃烧技术,对锅炉进行技术升级。测得锅炉在三个负荷段改造前后的烟气NO_(x)原始排放浓度分别由149、204.2、220.4 mg/m 3下降至92.1、122.2、146.3 mg/m 3,分别下降了38.2%、40.2%、33.6%,取得了较好的效果,达到了超低排放标准,降低了投资,为其广泛应用提供了参考。

The secondary air of the existing circulating fluidized bed boiler cannot penetrate the material and the temperature difference in the furnace is not uniform,the combustion efficiency is low and the flue gas emission is not up to standard.The boiler is technically upgraded using low-nitrogen combustion technologies such as secondary air system design,furnace temperature difference adjustment,flue gas recirculation system,and re-implantation transformation.By testing the original emission of flue gas NO_(x) before and after the transformation of the boiler,under the three load sections,the concentration decreased from 149,204.2 and 220.4 mg/m 3 to 92.1,122.2 and 146.3 mg/m 3 respectively,decreased by 38.2%,40.2%and 33.6%respectively,achieved good results,reached the ultra-low emission standard,reduced investment and provided a reference for its wide application.