CAJ | 학술논문

针对某燃用烟煤的200MW机组采用四角切圆布置方式燃烧器的670t/h锅炉,在主燃烧区域采用水平浓淡燃烧器、加装燃尽风喷口,采取燃料水平分级与空气垂直分级结合的方式进行改造,降低氮氧化物(NOx)排放水平.研究了该低NOx燃烧系统对锅炉NOx/CO排放和飞灰可燃物的影响规律.试验结果表明,当采用合理的燃尽风布置合理的二次风配风调节方式,燃尽风份额控制在30%时,机组N0x排放量可降低到300mg/m3以下;在任一工况下都不高于400mg/m3,其中最低N0x排放浓度为250.84mg/m3.同时,对飞灰含碳量影响较小,保持在1.5%~3%之间.
침대모연용연매적200MW궤조채용사각절원포치방식연소기적670t/h과로,재주연소구역채용수평농담연소기、가장연진풍분구,채취연료수평분급여공기수직분급결합적방식진행개조,강저담양화물(NOx)배방수평.연구료해저NOx연소계통대과로NOx/CO배방화비회가연물적영향규률.시험결과표명,당채용합리적연진풍포치합리적이차풍배풍조절방식,연진풍빈액공제재30%시,궤조N0x배방량가강저도300mg/m3이하;재임일공황하도불고우400mg/m3,기중최저N0x배방농도위250.84mg/m3.동시,대비회함탄량영향교소,보지재1.5%~3%지간.
An experimental investigation to reduce the N0x emission during burning bituminous coal was carried out on a 670t/h tangential pulverized coal firing furnace, with a technique combining horizontal bias combustion (HBC) burners in the primary combustion zone and separated over firing air (SOFA) nozzles above the highest secondary air nozzles. The influence mechanisms of this low NOx combustion system on NOx/CO emission and unburned carbon in fly ash have been measured and studied in situ. The tests indicate the amount of NOx emission can be decreased to less than 300mg/m3 after adopting the reasonable distribution of secondary air, of which the OFA ratio is 30%. The concentration of NOx is lower than 400mg/m3 in any case, and the lowest concentration can reach 250.84mg/m3. Meanwhile, there is little effect on the unburned carbon content in fly ash which varies between l.5% and 3%.