摘要
对某热电厂75 t/h循环流化床锅炉进行烟气再循环技术改造,改造后的现场试验结果表明:随烟气再循环率从零增大到23%,炉膛料层、过渡区温度分别下降42和27℃,炉膛出口温度降低13℃,;NO_x排放量由451降至325 mg/Nm^3,脱硝效率为27.9%;尾部烟道出口烟气温度逐渐升高,氧量虽逐渐下降但趋势减小。本试验验证了循环流化床锅炉采用烟气再循环技术降低料层温度及氮氧化物排放是切实可行的。
Flue gas recirculation technology retrofit was carried out for a 75 t/h circulating fluidized bed boiler of a thermal power plant.The field test results showed that as the flue gas recirculation rate increases from 0 to 23%,the temperatures in the material layer of furnace and the ttransition zone decrease by 42 ℃ and 27 ℃,respectively.Furnace outlet temperature is declined by 13 ℃.The NOxemission falls from 451 mg/Nm^3 to 325 mg/Nm^3,and the denitration efficiency is 27.9%.In the outlet of chimney flue,flue gas temperature gradually increases,and the oxygen content of flue gas decreases gradually but the decrease rate becomes slower.This experiment verifies that using flue gas recirculation technology to reduce the material layer temperature and nitrogen oxides emissions in the circulating fluidized bed boiler is feasible and effective.
出处
《热能动力工程》
CAS
CSCD
北大核心
2017年第11期73-77,共5页
Journal of Engineering for Thermal Energy and Power
关键词
循环流化床锅炉
烟气再循环
氮氧化物
circulating fluidized bed boiler
flue gas recirculation
nitrogen oxides
