CAJ | 학술논문

配风方式是影响煤粉燃烧过程NO_x排放的关键因素.对非设计配风条件下W火焰锅炉NO_x排放特性进行深入研究具有重要意义.应用CFX-TASCFLOW软件对一台现役300 MW机组W火焰锅炉进行了数值模拟,利用现场运行数据验证了基础工况数值模拟的准确性.进行了18种非设计配风工况炉内燃烧数值模拟,计算与分析结果表明:前后拱上一次风量比在大于5:6与小于6:5范围内变化时,前后拱一次风量偏差对NO生成有显著影响,一次风速增加使得NO_x的排放浓度降低.
배풍방식시영향매분연소과정NO_x배방적관건인소.대비설계배풍조건하W화염과로NO_x배방특성진행심입연구구유중요의의.응용CFX-TASCFLOW연건대일태현역300 MW궤조W화염과로진행료수치모의,이용현장운행수거험증료기출공황수치모의적준학성.진행료18충비설계배풍공황로내연소수치모의,계산여분석결과표명:전후공상일차풍량비재대우5:6여소우6:5범위내변화시,전후공일차풍량편차대NO생성유현저영향,일차풍속증가사득NO_x적배방농도강저.
The air distribution pattern is a key factor influencing the NO_x emissions in a pulverized coal combustion process. It is of major significance to study in depth the NO_x emission characteristics of a boiler with a W-shaped flame under the condition of an off-design air distribution. By using software CFX-TASCFLOW, a numerical simulation was conducted of a 300 MW plant with the above boiler in active service. The on-site operating data were used to verify the accuracy of the numerical simulation results at the base load condition. The in-furnace combustion was numerically simulated at 18 off-design air distribution operating conditions. The calculation and analysis results show that when the primary air ratio of the front and rear arch changes in a range of more than 5:6 and less than 6:5, the difference of the primary air flow of the front and rear arch will exercise a notable influence on NO roduction. An increase of the primary air speed will lead to a reduction of the NO_x emissions concentration.