CAJ | 학술논문

提出了一种多段式自预热燃烧器及其4种典型的预热室结构，通过计算流体力学（CFD）方法研究了燃烧室内流场、烟气卷吸率、温度场、燃气燃尽率以及NOx体积分数，并与传统燃烧器的情况进行了对比．结果表明：与传统燃烧器相比，多段式自预热燃烧器改变了燃烧室内流场，对低热值燃料适应性强，其预热室结构同时影响烟气卷吸率和预热效果，并最终影响燃尽率与NOx体积分数；此外，燃烧器负荷对燃尽率影响甚微，但对NOx体积分数影响较大．
제출료일충다단식자예열연소기급기4충전형적예열실결구，통과계산류체역학（CFD）방법연구료연소실내류장、연기권흡솔、온도장、연기연진솔이급NOx체적분수，병여전통연소기적정황진행료대비．결과표명：여전통연소기상비，다단식자예열연소기개변료연소실내류장，대저열치연료괄응성강，기예열실결구동시영향연기권흡솔화예열효과，병최종영향연진솔여NOx체적분수；차외，연소기부하대연진솔영향심미，단대NOx체적분수영향교대．
An introduction is being presented to the structure of a multi-stage self-preheating burner and its four typical preheating chambers. Through CFD simulation, the flow field, flue gas recirculation rate, temperature field, fuel gas burn-out rate and volumetric fraction of NOx in the combustion chamber have been calculated and analyzed in comparison with that of traditional burners. Results show that compared with traditional burners, the proposed burner has a different flow field and a higher adaptability to fuels of low heating values; the structure of its preheating chamber influences both the flue gas recirculation rate and the preheating effectiveness, and therefore accordingly influences the burn-out rate and NOx emission. Furthermore, the load of the burner affects less on the burn-out rate, but more on NOx emission.