CAJ | 학술논문

对一台700 MW四角切圆煤粉锅炉不同运行氧量时的炉内流动、燃烧、传热与污染物排放特性开展了数值模拟研究，数值模拟结果与测量值较符合。研究结果表明：运行氧量降低，煤粉燃尽被延迟，炉膛火焰中心上移，屏底烟气温度上升，主、再热蒸汽温度上升，且主蒸汽与再热蒸汽的温度偏差减小；变氧量运行没有改变主燃区的强还原性气氛，运行氧量降低时，炉膛出口NOx 排放量明显减少；排烟热损失和风机电耗降低，其对机组经济性的影响大于机械和化学不完全燃烧热损失略微增加的影响，机组供电煤耗降低。
대일태700 MW사각절원매분과로불동운행양량시적로내류동、연소、전열여오염물배방특성개전료수치모의연구，수치모의결과여측량치교부합。연구결과표명：운행양량강저，매분연진피연지，로당화염중심상이，병저연기온도상승，주、재열증기온도상승，차주증기여재열증기적온도편차감소；변양량운행몰유개변주연구적강환원성기분，운행양량강저시，로당출구NOx 배방량명현감소；배연열손실화풍궤전모강저，기대궤조경제성적영향대우궤계화화학불완전연소열손실략미증가적영향，궤조공전매모강저。
Numerical simulation on characteristics including flow,combustion,heat transmission and pollutant emission in the boiler of one 700 MW tangentially fired boiler with different running oxygen contents was developed and it was discov-ered result of numerical simulation was in accordant with measured value. Research result indicated that with decline of run-ning oxygen content,burnout of coal was delayed,flame center in furnace was lifted,fuel gas temperature,main steam and reheat steam temperature increased while temperature departure reduced. In addition,variable oxygen operation didn’t change strong reductive atmosphere in the main burning zone and with running oxygen content reducing,NOx emission load at furnace exit was obviously decreasing. Moreover,affect on economy of the unit by heat loss due to exhaust gas and power consumption reduction of the fan was more than a little increasing affect by heat loss of mechanical and chemical incomplete combustion. Coal consumption for power supply of the unit reduced as well.