CAJ | 학술논문

为提高无烟煤燃烧效率和降低 NOx的排放，提出借助循环流化床在低空气当量比下燃烧的技术将无烟煤粉预热到800℃以上再进入到下行燃烧室中燃烧的新工艺。在小型实验台上对预热后无烟煤粉的氮氧化物排放特性进行了实验研究。热态实验以阳泉无烟煤为燃料，实验台由提供高温预热燃料的循环流化床和用于预热燃料燃烧的下行燃烧室组成。实验结果表明，预热过程中约有36.9%的煤氮被还原为 N2。随着还原区空气当量比和过量空气系数的增加， NOx的排放增加；随着煤粉在还原区停留时间的增加，NOx的排放减少。煤粉预热技术和分级燃烧技术相结合能有效降低无烟煤粉燃烧中 NOx的排放。实验中，预热后无烟煤粉的燃烧效率最高能达到97.5%。
위제고무연매연소효솔화강저 NOx적배방，제출차조순배류화상재저공기당량비하연소적기술장무연매분예열도800℃이상재진입도하행연소실중연소적신공예。재소형실험태상대예열후무연매분적담양화물배방특성진행료실험연구。열태실험이양천무연매위연료，실험태유제공고온예열연료적순배류화상화용우예열연료연소적하행연소실조성。실험결과표명，예열과정중약유36.9%적매담피환원위 N2。수착환원구공기당량비화과량공기계수적증가， NOx적배방증가；수착매분재환원구정류시간적증가，NOx적배방감소。매분예열기술화분급연소기술상결합능유효강저무연매분연소중 NOx적배방。실험중，예열후무연매분적연소효솔최고능체도97.5%。
A new technique of pulverized anthracite combustion was proposed to improve combustion efficiency and reduce NOx emission. On a pilot scale test rig, pulverized anthracite was heated to the temperature higher than 800℃ in a circulating fluidized bed with partial combustion under low air equivalence ratio and then combusted in a down-fired combustor. NOx emission of the preheated pulverized Yangquan anthracite combustion was studied. The experimental results show that about 36.9% coal-nitrogen has been reduced to N2 during the preheating process, NOx emission decreases with the increase in the residence time of pulverized coal in the reducing zone, and increases when the air equivalence ratio in the reducing zone and excess air ratio increases. It is also revealed that the co-exiting of air-staging combustion and anthracite coal preheating is effective to reduce nitrogen oxide emission for pulverized anthracite coal combustion, and the combustion efficiency can reach 97.5%.