CAJ | 학술논문

利用Ansys12．0软件对实际电站锅炉的炉内流场进行了数值模拟，分别研究了内、外二次风旋流强度对炉内流场的影响．结果表明：随着旋流强度的增加，中心回流区开始远离燃烧器出口轴线位置，回流区长度增加，回流区面积增大，当旋流强度大于某一数值时，将不能形成较好的中心回流区，易发生飞边现象；外二次风旋流强度对回流区的影响较大，但调节范围却较小，而内二次风旋流强度的可调范围较大；内二次风和外二次风旋流强度的可调范围分别为0．58～2．74和0．58～1．00．
이용Ansys12．0연건대실제전참과로적로내류장진행료수치모의，분별연구료내、외이차풍선류강도대로내류장적영향．결과표명：수착선류강도적증가，중심회류구개시원리연소기출구축선위치，회류구장도증가，회류구면적증대，당선류강도대우모일수치시，장불능형성교호적중심회류구，역발생비변현상；외이차풍선류강도대회류구적영향교대，단조절범위각교소，이내이차풍선류강도적가조범위교대；내이차풍화외이차풍선류강도적가조범위분별위0．58～2．74화0．58～1．00．
Numerical simulation was conducted with software Ansys 12.0 on the flow field of power plant boiler, so as to study the effect of swirl intensity of both the internal and external secondary air on the in- furnace flow field. Results show that with the rise of swirl intensity, the central backflow zone begins to move away from the axis of burner outlet, with an elongated length and an enlarged area; when the swirl intensity rises to a certain value, no ideal central back{low zone would be formed, in which case flash phe- nomenon may occur; the swirl intensity of external secondary air has a higher effect on the backflow zone, with an adjustable range narrower than that of the internal secondary air; the adjustable range of internal and external secondary air is 0.58-2.74 and 0.58-1.00 respectively.