水煤浆空气分级燃烧及NO_x排放特性试验研究

Experiment Study on Characteristics of Combustion and NO_x Emission in Coal Water Slurry Air-staged Combusting

在0.5 MW水煤浆燃烧试验台上进行水煤浆空气分级燃烧试验研究,研究空气分级配风比例、分级风送入方式对水煤浆燃烧NOx排放量的影响规律,分析空气分级燃烧对烟气中其他成分、结渣等的影响。通过燃尽风比例和投入位置的调整,当燃尽风比例为18%时,NOx的排放量降低到212 mg/m3(折算到Φ(O2)=6%),进一步提高燃尽风比例会造成主燃区燃烧不稳定。采用空气分级燃烧技术后,能够降低水煤浆燃烧NOx排放量,对水煤浆燃烧燃尽效果没有产生不利影响,没有造成结渣的问题。

An air-staged and low NOx emission coal water slurry（CWS）technology was studied on a 0.5 MW large-scale laboratory furnace. The impacts of staged-air proportion and input-pattern to the NOx emission were analyzed. The impacts of flue gas components and slagging were also studied. As staged-air proportion and input-pattern optimized, the nitrogen oxide emission of CWS is reduced to 212 mg/m^3（6%O2） at the OFA proportion of 18%, increasing OFA proportion does not benefit the combustion Stabilization of the main combustion zone. With the air-staged combustion, the NOx emission is reduced, the burnout rate does not reduce and the slagging is not deteriorated.