热力发电
熱力髮電
열력발전
THERMAL POWER GENERATION
2014年
7期
56-60,65
,共6页
煤粉锅炉%四角切圆%分级燃烧%优化改造%N Ox%数值模拟
煤粉鍋爐%四角切圓%分級燃燒%優化改造%N Ox%數值模擬
매분과로%사각절원%분급연소%우화개조%N Ox%수치모의
pulverized boiler%tangentially fired%staged combustion%optimization%NOx%numerical simulation
运用Fluent软件,对采用立体式分级低氮燃烧技术进行燃烧器改造的某300 MW机组四角切圆燃烧锅炉改造前后额定工况下炉内的速度场、温度场、组分场以及 N Ox浓度场进行了数值计算,并与对应工况下的试验值进行对比,计算值与试验值吻合较好,验证了数值计算的准确性。计算及试验结果表明：采用立体式分级低氮燃烧技术有效控制了炉内结焦和高温腐蚀,N Ox 排放浓度较改造前降低40％左右,对同类型锅炉机组采用相似的燃烧器优化改造具有一定的参考价值。
運用Fluent軟件,對採用立體式分級低氮燃燒技術進行燃燒器改造的某300 MW機組四角切圓燃燒鍋爐改造前後額定工況下爐內的速度場、溫度場、組分場以及 N Ox濃度場進行瞭數值計算,併與對應工況下的試驗值進行對比,計算值與試驗值吻閤較好,驗證瞭數值計算的準確性。計算及試驗結果錶明：採用立體式分級低氮燃燒技術有效控製瞭爐內結焦和高溫腐蝕,N Ox 排放濃度較改造前降低40％左右,對同類型鍋爐機組採用相似的燃燒器優化改造具有一定的參攷價值。
운용Fluent연건,대채용입체식분급저담연소기술진행연소기개조적모300 MW궤조사각절원연소과로개조전후액정공황하로내적속도장、온도장、조분장이급 N Ox농도장진행료수치계산,병여대응공황하적시험치진행대비,계산치여시험치문합교호,험증료수치계산적준학성。계산급시험결과표명：채용입체식분급저담연소기술유효공제료로내결초화고온부식,N Ox 배방농도교개조전강저40％좌우,대동류형과로궤조채용상사적연소기우화개조구유일정적삼고개치。
The Fluent software was applied to conduct numerical simulation on a 300 MW tangen-tially pulverized coal-fired boiler,for which the burners were modified by adopting stereo-staged process of low NOx combustion technique.The velocity field,temperature field,component field and NOx concentration field in furnace were simulated under rated condition before and after the modification.The calculated values were compared with the experimental data,and they agreed well with each other,verifying the accuracy of numerical calculation.The results show that:slag-ging and high-temperature corrosion in furnace could be effectively controlled by adopting the stereo-staged process of low NOx combustion technique,and NOx emission concentration reduced by about 40% compared after the modification.
